By Voltage Or Current Modification Patents (Class 388/806)
  • Patent number: 9600000
    Abstract: A method and a device are based on the application of an active correcting system with central corrector and Youla parameter for the attenuation of essentially monofrequency mechanical vibratory perturbations generated in a material structure by a rotating machine. Previously, a control law corresponding to a block modeling of the system is established and calculated, the blocks being, on the other hand, those of the central corrector and, on the other hand, a Youla parameter block, the modeling being such that only the Youla parameter, in the form of an infinite impulse response filter, has coefficients dependent on the vibratory perturbation frequency. During a phase of use, in real time, the frequency of the current perturbation is determined and the control law is calculated using for the Youla parameter the stored coefficients of a determined perturbation frequency corresponding to the current perturbation frequency.
    Type: Grant
    Filed: November 16, 2011
    Date of Patent: March 21, 2017
    Assignee: IXBLUE
    Inventor: Bernard Vau
  • Patent number: 9236829
    Abstract: A motor driving circuit for driving a motor, includes: a detecting circuit configured to detect a detection signal indicative of a current state of the motor; a command value generating unit configured to generate a command value indicative of a target state of the motor; an error amplifier configured to generate an error signal by amplifying an error between the detection signal and the command value; a pulse width modulator configured to generate a pulse signal; and an output circuit. The command value generating unit is configured to provide a variation to the command value.
    Type: Grant
    Filed: June 4, 2013
    Date of Patent: January 12, 2016
    Assignee: Rohm Co., Ltd.
    Inventor: Hisashi Sugie
  • Patent number: 9207198
    Abstract: Electrical tomography apparatus comprises: a first electrode; a second electrode; and current driving means for driving an electrical current between the first electrode and the second electrode through a medium, wherein the current driving means comprises: a first transformer having a first winding and a second winding, the second winding having a first terminal and a second terminal; and means for generating an alternating current through the first winding so as to generate an alternating voltage between said first terminal and said second terminal. The apparatus further comprises connecting means arranged to connect the first terminal to the first electrode and the second terminal to the second electrode. Generation of the alternating current in the first winding results in generation of an alternating voltage between the first and second electrodes. In certain embodiments, a current sensing transformer provides an indication of current driven through the medium.
    Type: Grant
    Filed: June 22, 2010
    Date of Patent: December 8, 2015
    Assignee: The University of Leeds
    Inventors: Mi Wang, Jiabin Jia
  • Patent number: 9163611
    Abstract: According to the present disclosure, a method of operating a wind turbine (10) coupled to a power grid (92) for delivering electric power thereto is provided. The method includes: a) operating the wind turbine (10) in a noise reduction mode; b) determining whether the power grid (92) is in an unstable grid state corresponding to an increase of power demand; and, c) increasing the electric power delivered by the wind turbine (10) to the power grid (92) during a stabilization time period for supporting stabilization of the unstable grid. Further, the increasing of the electric power for supporting stabilization of the unstable grid is performed such that a resulting noise increase is below a selected upper level. In addition thereto, a control system and a wind turbine for performing the above method are provided.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: October 20, 2015
    Assignee: General Electric Company
    Inventors: Pedro Luis Santiago Benito, Eugenio Yegro Segovia
  • Patent number: 9059657
    Abstract: A motor control device includes a PWM signal generation unit configured to increase/decrease duty in both leading and lagging directions regarding a phase in which the duty becomes maximum among three-phase PWM signals. The unit is also configured to increase/decrease the duty in one of leading and lagging directions regarding a phase in which the duty becomes minimum. Regarding a phase in which duty is intermediate between the phases, the unit is configured to increase/decrease duty in the other of the leading and lagging directions based on the phase, thereby generating a three-phase PWM signal pattern so that a current detection unit is capable of detecting two-phase currents at two time-points fixed within a carrier period of the PWM signal respectively. A duty compensation unit is configured to increase/decrease before and after changing an increasing/decreasing direction of three-phase duties, increasing/decreasing the duties to compensate for the duties.
    Type: Grant
    Filed: September 16, 2013
    Date of Patent: June 16, 2015
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventor: Sari Maekawa
  • Patent number: 8836261
    Abstract: A detection control system includes a sensing unit, a control module and a driving module for a motor including a rotor and a stator. The sensing unit electrically connects the motor to sense a first and a second magnetic pole of the rotor cross a chip disposed between the rotor and the stator; a third magnetic pole is alternated to a forth magnetic pole of the stator to generate a sensing signal. A detection unit of the control module detects a kickback voltage value generated by a first current value changing to a second current value to calculate a minimum current value to generate a detecting signal. A timing unit receives the sensing and the detecting signal to calculate a first and a second period of time, and a discharging time. The driving module drives the rotor by receiving a control signal the control unit generates by controlling an alternating time.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: September 16, 2014
    Assignee: Feeling Technology Corp.
    Inventors: Sheng-Hsiang Yen, Hsuan-Chuan Chen
  • Patent number: 8798826
    Abstract: A lower limit value setting unit (52) variably sets a lower limit value (Vth) of a target voltage (Vh*) in a range of a voltage that is higher than the maximum value of voltages (Vb1, Vb2) of power storage devices and is not affected by a dead time provided for converters, based on temperatures (Tb1, Tb2) and required electric powers (Pb1*, Pb2*). A maximum value selection unit (53) sets the maximum value among the voltages (Vb1, Vb2) of the power storage devices and required voltages (Vm1*, Vm2*) of motor-generators, as the target voltage. A target voltage limiting unit (54) compares the target voltage with the lower limit value (Vth), and if the target voltage is lower than the lower limit value (Vth), the target voltage limiting unit (54) sets the lower limit value (Vth) as the target voltage (Vh*).
    Type: Grant
    Filed: May 26, 2008
    Date of Patent: August 5, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Shinji Ichikawa
  • Patent number: 8602747
    Abstract: Having a correlative relation indicator for indicating a correlative relation so that the supply current to be supplied to an inverter circuit may be varied proportionally to the voltage applied to the inverter circuit, a supply current value controller controls the average current to be supplied to the inverter circuit so as to be equal to the value of the supply current indicated by the correlative relation indicator, and therefore if the pressure loss or the static pressure is changed, a wind volume-static pressure of high precision extremely small in the changing amount of wind volume is realized.
    Type: Grant
    Filed: March 3, 2009
    Date of Patent: December 10, 2013
    Assignee: Panasonic Corporation
    Inventor: Masayuki Takada
  • Patent number: 8159170
    Abstract: When cooling operation or dehumidifying operation is started, a blower fan for an evaporator and an exhaust fan for a condenser are driven at an initial rotational number. A compressor is driven at a fixed rotational number. Due to load variation, an operating current supplied from a power source is changed. When the operating current exceeds a reference value, the rotational number of the blower fan is gradually reduced. When an endothermic quantity by the evaporator decreases, a temperature of a gas refrigerant flowing through the evaporator is lowered. Since the load applied on the compressor is reduced, the operating current decreases. In this way, when the compressor is loaded, the operating current increased, however, by controlling operation of the fans as described above, it is possible to prevent that the power source is shut off due to overcurrent and operation is stopped.
    Type: Grant
    Filed: January 28, 2009
    Date of Patent: April 17, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Atsushi Kakiuchi
  • Patent number: 8159164
    Abstract: A variable-delay-time control system for a motor is provided. The system includes a control unit, a driving unit, and a motor. The control unit is used to output at least one control signal according to at least one predetermined signal, and the control signal has a variable delay time. The driving unit is connected to the control unit, and is used to receive the control signal and generate a driving signal. The motor is connected to the driving unit, and conduction time of the motor is controlled according to the driving signal and the variable delay time. With the variable-delay-time control system of the present invention, the delay time of the control signal is variable, so the motor can operate at a high efficiency (for example, at a reduced current). Moreover, as the variable-delay time can be adjusted according to the predetermined signal, the motor can operate at a high efficiency in different operating states, thus improving the overall efficiency of the motor.
    Type: Grant
    Filed: June 15, 2009
    Date of Patent: April 17, 2012
    Assignee: Sunonwealth Electric Machine Industry Co., Ltd.
    Inventors: Alex Horng, Hsin-Nan Lin, Chien-Heng Peng
  • Patent number: 7959414
    Abstract: The present invention relates to a control system for protection against breakage of the lubricating-oil film in the bearings of hermetic compressors, as well as to a control method that has the objective of guaranteeing that a variable-capacity compressor should be maintained above a minimum rotation in order to prevent the oil film close to the respective bearing from breaking. One of the forms of achieving the objectives of the present invention is by means of a control system for protection against break of the lubricating-oil film in bearings of hermetic compressors, a microprocessor (10) actuating a set of switches (SW2M) selectively, so as to generate a rotation at the motor-compressor assembly (20, 21), the compressor (21) having a minimum rotation (RPMmin) of the compressor (21) so that the oil film will not be broken.
    Type: Grant
    Filed: April 27, 2006
    Date of Patent: June 14, 2011
    Assignee: Whirlpool S.A.
    Inventors: Marcos Guilherme Schwarz, Roberto Andrich, Fabio Henrique Klein
  • Publication number: 20110033174
    Abstract: The present invention discloses a control circuit for a variable frequency DC motor, the control circuit comprising: a controller, having a voltage sensing input end and a control output end, wherein the control output end is used to deliver an output signal according to the difference between a threshold voltage and the voltage at the voltage sensing input end; a transistor, having a first terminal, a second terminal and a third terminal, wherein the first terminal is coupled to the voltage sensing input end, and the second terminal is coupled to the variable frequency DC motor, and the third terminal is coupled to a reference ground; and a voltage divider, coupled between the second terminal and the third terminal, used to generate a feedback voltage for the voltage sensing input end; wherein the voltage at the second terminal is regulated according to the threshold voltage.
    Type: Application
    Filed: August 6, 2009
    Publication date: February 10, 2011
    Applicant: GRENERGY OPTO, INC.
    Inventors: Ko-Yen Lee, Chang-Ling Sha
  • Patent number: 7830642
    Abstract: A disc apparatus which can judge accurately whether or not a spindle motor is at fault due to a short circuit is provided. A disc apparatus (1) includes a spindle motor (3) which rotates a disc (2), a differential operational amplifier (5) which successively detects output voltages of the spindle motor (3), and a failure judgment unit (10) which calculates an average voltage of the plural output voltages and judges whether or not the spindle motor (3) is at fault in accordance with the average voltage and the output voltages. When counting number of occurrences of a specific state which indicates that one of the two output voltages detected successively is larger than the average voltage and other of the two output voltages is smaller than the average voltage, the failure judgment unit (10) judges that the spindle motor (3) is at fault.
    Type: Grant
    Filed: April 24, 2008
    Date of Patent: November 9, 2010
    Assignee: Funai Electric Co., Ltd.
    Inventors: Kazuki Kajikawa, Futoshi Takeda, Toshiaki Fukui, Kazuhiro Ichikawa, Kazuto Kitagawa
  • Patent number: 7684682
    Abstract: A fan speed control circuit is used for controlling rotation speed of a fan. The fan speed control circuit receives a pulse width modulation (PWM) signal from a system and comprises a programmable control unit and a current control unit. The programmable control unit receives the PWM signal, is connected to a Hall element for receiving a voltage signal therefrom, and provides a control signal. The current control unit takes the control signal to control current flowing through a stator coil unit of the fan so as to control the speed of the fan. The programmable control unit has a program written for the PWM signal, and when the fan speed control circuit is used in another system with a different PWM signal, the programmable control unit can be given a new program for the different PWM signal for controlling the speed of the fan.
    Type: Grant
    Filed: July 23, 2007
    Date of Patent: March 23, 2010
    Assignees: Fu Zhun Precision Industry (Shen Zhen) Co., Ltd., Foxconn Technology Co., Ltd.
    Inventor: Hai-Rong Huang
  • Patent number: 7656110
    Abstract: A control and motor arrangement in accordance with the present invention includes a motor configured to generate a locomotive force for propelling the model train. The control and motor arrangement further includes a command control interface configured to receive commands from a command control unit wherein the commands correspond to a desired speed. The control and motor arrangement still further includes a plurality of detectors configured to detect speed information of the motor, and a process control arrangement configured to receive the speed information from the sensors. The process control arrangement is further configured and arranged to generate a plurality of motor control signals based on the speed information for controlling the speed of said motor. The control and motor arrangement yet still further includes a motor control arrangement configured to cause power to be applied to the motor at different times in response to the motor control signals.
    Type: Grant
    Filed: October 23, 2007
    Date of Patent: February 2, 2010
    Assignee: Lionel L.L.C.
    Inventors: Dennis J. Denen, Neil P. Young, Gary L. Moreau, Martin Pierson, Robert Grubba
  • Patent number: 7657161
    Abstract: A method of constant airflow control for a ventilation system is disclosed. The method includes various controls to accomplish a substantially constant airflow rate over a significant change of the static pressure in a ventilation duct. One control is a constant I·RPM control, which is primarily used in a low static pressure range. Another control is a constant RPM control, which is primarily used in a high static pressure range. These controls requires neither a static pressure sensor nor an airflow rate sensor to accomplish substantially constant airflow rate while static pressure changes. This is because these controls use only intrinsic control variables which are electric current and rotational speed of the motor. Also, the method improves the accuracy of the control by correcting certain deviations that are caused by the motor's current-RPM characteristics. To compensate the deviation, the method adopts a test operation in a minimum static pressure condition.
    Type: Grant
    Filed: January 18, 2008
    Date of Patent: February 2, 2010
    Inventor: Young-Chun Jeung
  • Publication number: 20090257740
    Abstract: A switching regulation circuit for a dual-winding motor apparatus is provided. The switching regulation circuit comprises a gate-controlled device and a driving circuit. When one of the two windings generates an induced voltage signal greater than a threshold value, the driving circuit generates an output signal for turning on the gate-controlled transistor. Thereby, a parasitic diode of the gate-controlled device will not be turned on and damage the entire circuit.
    Type: Application
    Filed: August 4, 2008
    Publication date: October 15, 2009
    Applicant: FEELING TECHNOLOGY CORP.
    Inventors: Hsuan-Chuan Chen, Teng-Tsai Lin
  • Patent number: 7596304
    Abstract: Disclosed is a starting device and method for eliminating a peak current introduced when an inductive circuit such as a motor or a direct-current (DC) motor is actuated, The starting device includes a signal generator electrically connected to the inductive circuit and generating a first signal corresponding to a signal output by the inductive circuit, a comparative circuit electrically connected to the signal generator for converting the first signal to a second signal to be compared with a reference signal to generate a control signal, and a controlling device electrically connected with the inductive circuit and the comparative circuit for receiving the control signal and gradually increasing a current input into the inductive circuit corresponding to the control signal, thereby eliminating the peak current introduced when the inductive circuit is actuated.
    Type: Grant
    Filed: January 24, 2001
    Date of Patent: September 29, 2009
    Assignee: Delta Electronics Inc.
    Inventor: Shou-Te Yu
  • Patent number: 7545109
    Abstract: A method and article of manufacture for monitoring an electrical energy storage device adapted to supply electrical power to a selectively actuable electric motor is described. This comprises determining a state of charge and a temperature of the electrical energy storage device subsequent to a stabilization period, and measuring a minimum voltage output from the electrical energy storage device during selective actuation of the electric motor. One of a plurality of predetermined threshold voltage states is selected based upon the state of charge and the temperature. The minimum voltage is compared to the selected predetermined threshold voltage.
    Type: Grant
    Filed: April 17, 2007
    Date of Patent: June 9, 2009
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Mutasim A. Salman, Nick S. Kapsokavathis, Xiaodong Zhang, David W. Walters, Xidong Tang
  • Publication number: 20090136220
    Abstract: A method of constant airflow control for a ventilation system is disclosed. The method includes various controls to accomplish a substantially constant airflow rate over a significant change of the static pressure in a ventilation duct. One control is a constant I·RPM control, which is primarily used in a low static pressure range. Another control is a constant RPM control, which is primarily used in a high static pressure range. These controls requires neither a static pressure sensor nor an airflow rate sensor to accomplish substantially constant airflow rate while static pressure changes. This is because these controls use only intrinsic control variables which are electric current and rotational speed of the motor. Also, the method improves the accuracy of the control by correcting certain deviations that are caused by the motor's current-RPM characteristics. To compensate the deviation, the method adopts a test operation in a minimum static pressure condition.
    Type: Application
    Filed: January 18, 2008
    Publication date: May 28, 2009
    Inventor: YOUNG-CHUN JEUNG
  • Patent number: 7529608
    Abstract: A drive control device is provided with a determining section and a voltage increasing section. The determining section determines if the actual acceleration is deficient in comparison with the acceleration requested by the driver or if the generator output is deficient in comparison with the acceleration requested by the driver. The voltage increasing section increases the voltage supplied to the electric generator from a vehicle mounted electric power source when the determining section determines that the actual acceleration or the generator output is deficient. As a result, the generator output deficiency is eliminated and the required motor torque is produced, thereby enabling the vehicle to start into motion appropriately in accordance with the acceleration requested by the driver.
    Type: Grant
    Filed: November 17, 2004
    Date of Patent: May 5, 2009
    Assignee: Nissan Motor Co., Ltd.
    Inventor: Kouichi Shimizu
  • Patent number: 7508150
    Abstract: The rotational speed of a motor is detected, and stored in a rotational speed memory. The difference between the present rotational speed output and each of plural past rotational speeds stored in the rotational speed memory is calculated in a plural difference calculator. Whether the difference between the present rotational speed and the most past rotational speed out of the plural differences is larger than a first threshold value is judged. Whether at least one of the differences is larger than a second threshold value is judged. The first and second threshold values are set to values for detecting that the rotational speed of the motor has a decelerating trend through the comparison with the differences concerned, and the first threshold value is set to be smaller than the second threshold value. When both judgments have positive judgment results, it is judged that rotation abnormality of the motor occurs.
    Type: Grant
    Filed: February 8, 2007
    Date of Patent: March 24, 2009
    Assignee: OMRON Corporation
    Inventor: Tomohiro Takahashi
  • Patent number: 7454127
    Abstract: A multi-speed permanent magnet D.C. electric motor system 10 includes at least one permanent magnet DC electric motor 11 configured to operate at at least one speed. A current limiting device R1 is constructed and arranged to lower electrical input power to the motor 11 so that a speed of the motor is reduced, when the motor is powered together with the current limiting device, as compared to a speed of the motor powered absent the current limiting device. Switching structure K1, K2, K3 is associated with the current limiting device to selectively operate the motor at at least three discrete speeds, even though the motor is configured for at least one-speed operation.
    Type: Grant
    Filed: April 14, 2005
    Date of Patent: November 18, 2008
    Assignee: Continental Automotive Systems US, Inc.
    Inventors: Attila Simofi-Ilyes, Andrew Lakerdas, Mike Toner
  • Publication number: 20080260361
    Abstract: The present invention provides a method and apparatus for providing power to a fan motor. One embodiment of the apparatus includes a boost regulator configured to provide an output current to a fan motor using an input current provided at an input voltage by a power supply. The fan motor is configured to draw the output current at a first frequency and the input current is constant within a first selected tolerance over a time scale longer than indicated by the first frequency.
    Type: Application
    Filed: April 19, 2007
    Publication date: October 23, 2008
    Inventor: TOM P. STERK
  • Publication number: 20080175570
    Abstract: General purpose 100% solid state Direct Current drive for rotary DC machines with four quadrants operation. It is to say that allows the rotary DC machine to act like motor or generator in the two direction of possible rotation. In the first and third quadrant as motor in both direction of possible rotation, and in the second and fourth quadrant like regenerative brake DC generator, recovering the energy towards the DC network supply. To obtain that generalized control for DC machines of any type, the invention subject of this patent, is based on the interaction of two original ideas that they are: (1) Maintaining the direction, of the current in one and only one of the two main windings of the DC machine (7) either field or armature, by means of a rectifier bridge (6). (2) Use a DC controlled power supply (14), with reversible polarity to feed the complete machine.
    Type: Application
    Filed: September 25, 2007
    Publication date: July 24, 2008
    Inventor: Patricio Lagos Lehuede
  • Patent number: 7369757
    Abstract: A system for controlling a motor for use in a ventilation system may include a motor, a voltage adjustment system, a user interface, and a motor controller. The voltage adjustment system may be configured to adjust a voltage applied to the motor. The user interface may be configured to receive patient settings input from a user and communicate target ventilation parameters to the motor controller. The motor controller may include a calculation engine configured to calculate motor performance parameters for achieving the target ventilation parameters, and based at least on the calculated motor performance parameters, perform a voltage adjustment analysis for controlling the voltage adjustment system. The motor controller may further include a voltage adjuster controller configured to activate the voltage adjustment system based on a first result of the voltage adjustment analysis and to not activate the voltage adjustment system based on a second result of the voltage adjustment analysis.
    Type: Grant
    Filed: May 24, 2006
    Date of Patent: May 6, 2008
    Assignee: Nellcor Puritan Bennett Incorporated
    Inventor: John M. Farbarik
  • Publication number: 20070274693
    Abstract: A system for controlling a motor for use in a ventilation system may include a motor, a voltage adjustment system, a user interface, and a motor controller. The voltage adjustment system may be configured to adjust a voltage applied to the motor. The user interface may be configured to receive patient settings input from a user and communicate target ventilation parameters to the motor controller. The motor controller may include a calculation engine configured to calculate motor performance parameters for achieving the target ventilation parameters, and based at least on the calculated motor performance parameters, perform a voltage adjustment analysis for controlling the voltage adjustment system. The motor controller may further include a voltage adjuster controller configured to activate the voltage adjustment system based on a first result of the voltage adjustment analysis and to not activate the voltage adjustment system based on a second result of the voltage adjustment analysis.
    Type: Application
    Filed: May 24, 2006
    Publication date: November 29, 2007
    Inventor: John M. Farbarik
  • Patent number: 7282888
    Abstract: A driving circuit of an AC fan motor has an AC to DC converter, a current detecting unit, a step-down divider, a motor driving unit, two windings each having many coils and a harmonic wave elimination unit. The AC to DC converter converts AC power to high voltage DC power. The motor driving unit is connected to the step-down divider to obtain low voltage DC power to operate. The two windings are directly connected to the AC to DC converter through the current wave detect unit to obtain the high voltage DC power. Therefore, the current wave detecting unit can response current changes of windings and then an operator can simulate present current wave of the windings to determine the present operating status of the AC fan motor.
    Type: Grant
    Filed: December 20, 2005
    Date of Patent: October 16, 2007
    Assignee: ADDA Corp.
    Inventor: Hsin-Mao Hsieh
  • Patent number: 7274865
    Abstract: General purpose 100% solid state Direct Current drive for rotary DC machines with four quadrants operation. It is to say that allows the rotary DC machine to act like motor or generator in the two direction of possible rotation. In the first and third quadrant as motor in both direction of possible rotation, and in the second and fourth quadrant like regenerative brake DC generator, recovering the energy towards the DC network supply. To obtain that generalized control for DC machines of any type, the invention subject of this patent, is based on the interaction of two original ideas that they are: (1) Maintaining the direction of the current in one and only one of the two main windings of the DC machine (7) either field or armature, by means of a rectifier bridge (6). (2) Use a DC controlled power supply (14), with reversible polarity to feed the complete machine.
    Type: Grant
    Filed: September 7, 2004
    Date of Patent: September 25, 2007
    Inventor: Patricio Lagos Lehuede
  • Publication number: 20070201843
    Abstract: The rotational speed of a motor is detected, and stored in a rotational speed memory. The difference between the present rotational speed output and each of plural past rotational speeds stored in the rotational speed memory is calculated in a plural difference calculator. Whether the difference between the present rotational speed and the most past rotational speed out of the plural differences is larger than a first threshold value is judged. Whether at least one of the differences is larger than a second threshold value is judged. The first and second threshold values are set to values for detecting that the rotational speed of the motor has a decelerating trend through the comparison with the differences concerned, and the first threshold value is set to be smaller than the second threshold value. When both judgments have positive judgment results, it is judged that rotation abnormality of the motor occurs.
    Type: Application
    Filed: February 8, 2007
    Publication date: August 30, 2007
    Applicant: OMRON Corporation
    Inventor: Tomohiro Takahashi
  • Patent number: 7259531
    Abstract: The speed control apparatus comprises a plurality of Hall sensors, a plurality of switches, a turn-on control circuit, and a gate drive logic. The Hall sensors are configured to detect magnetic rotor sections of a poly-phase brushless DC motor at different positions. The switches apply voltages on a plurality of windings to respectively produce magnetic north or south on stator poles of the poly-phase BLDC motor. The turn-on control circuit generates a conduction time reduction after each output transition of the Hall sensors. The gate drive logic separately turns on or turns off the switches according to different output transitions of the Hall sensors to respectively apply voltages on the windings with the conduction time reduction.
    Type: Grant
    Filed: April 5, 2006
    Date of Patent: August 21, 2007
    Inventor: Kwang-Hwa Liu
  • Patent number: 7230358
    Abstract: Practically ideal electrical resonance is employed to soley provide armature power, and stator power if desired, to run DC motors. A practically ideal parallel resonant tank circuit (PIPRC) is used wherein the quotient of the “tank current” divided by the “line current” (called the “quality” or “Q” of the tank) is (1) greater than one, (2) large enough to allow the percent efficiency of the electric motor to be equal to or greater than 95%, and (3) removes enough back emf or enough of the influence thereof so that criteria (1) and (2) can be realized throughout the entire operating range of the motor. Only one PIPRC is needed for a DC motor. Recontrolling and/or redesigning is done for two reasons.
    Type: Grant
    Filed: April 6, 2004
    Date of Patent: June 12, 2007
    Inventor: Marcus Allen Smith
  • Patent number: 7145311
    Abstract: A vector control device of a winding field type synchronous machine with which even when voltage changes caused by resistance voltage falls and inductance fluctuations due to armature current occur the armature voltage is controlled exactly to a desired command value and a high power supply utilization percentage is maintained at all times. An absolute value of armature voltage is calculated from an armature voltage command value or an armature voltage detected value, and the armature voltage is controlled by a flux command being regulated so that this absolute value of armature voltage approaches a desired armature voltage command value. Also, the armature voltage command value is regulated so that the loss of the synchronous machine becomes minimal with reference to the armature current and the field current.
    Type: Grant
    Filed: March 29, 2005
    Date of Patent: December 5, 2006
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Akira Satake, Atsuo Haishi, Masaru Kobayashi
  • Patent number: 7133602
    Abstract: A power supply apparatus driving and controlling motor generators (MG1, MG2) includes a battery (10) generating an input voltage (Vb), a converter (110) converting the input voltage into a motor operating voltage (Vm) according to a voltage command value (Vmr), a smoothing capacitor (120) holding the motor operating voltage, inverters (131, 132) receiving the motor operating voltage and driving and controlling the motor generators (MG1, MG2) according to a torque command value (Tref), and a control unit (15) generating the voltage command value and the torque command value.
    Type: Grant
    Filed: December 13, 2004
    Date of Patent: November 7, 2006
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Kenji Yamada
  • Patent number: 7133603
    Abstract: A motor driving apparatus includes a power circuit that controls an output voltage via a feedback resistance. The power circuit varies the output voltage by changing a value of the feedback resistance at a time of at least one of activation and termination of a motor, thereby enabling to activate the motor at any one of a high speed and a low speed.
    Type: Grant
    Filed: February 25, 2005
    Date of Patent: November 7, 2006
    Assignee: Ricoh Company, Limited
    Inventor: Kazumasa Aoki
  • Patent number: 7068923
    Abstract: A speed control apparatus includes a speed control part 12 for generating a source current command based on a difference between a speed command of a motor 4 and speed detection in which a speed of the motor 4 for driving a load 2 is detected, a notch filter 14 which can break a notch frequency resulting in a predetermined frequency selected among continuous frequency band widths and also generates a compensating current command in which the notch frequency is eliminated from the source current command signal, a notch filter adaptive part 16 for selecting the notch frequency so that the compensating current command in which a sustained vibration frequency component of the source current command is eliminated is generated from the notch filter 14, a subtracter 103 for generating an elimination portion current command resulting in a difference between the source current command and the compensating current command, and an adder 109 for adding the compensating current command and the elimination portion current
    Type: Grant
    Filed: November 26, 2002
    Date of Patent: June 27, 2006
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Tomohiro Miyazaki
  • Patent number: 7062159
    Abstract: A device for correcting a digital estimate of an electric signal is described. The device includes a comparator that generates a current proportional to the difference between an analog estimate signal, which derives from the digital estimate, and the electric signal. The device also includes a capacitor positioned to be charged by the current, a transistor that discharges the capacitor, and a comparator that compares the voltage at the terminal of the capacitor with a reference voltage. The device also includes a controller that drives the transistor in response to the output signal of the comparator and a logic device that generates a correction digital signal to be added to or subtracted from the digital estimate of the electric signal in correspondence of an ascending or descending waveform of the electric signal.
    Type: Grant
    Filed: December 7, 2004
    Date of Patent: June 13, 2006
    Assignee: STMicroelectronics S.r.l.
    Inventors: Antonio Borrello, Stefano Saggini, Aldo Novelli, Ignazio Bellomo
  • Patent number: 7042227
    Abstract: A method and system for determining a torque current in an electric machine coupled to a polyphase bus. The method comprises: detecting a rotational position of the electric machine with a position encoder; controlling an inverter comprising a plurality of switching devices, the inverter having an input coupled to a direct current bus, and an output coupled to the polyphase bus. Where the inverter is responsive to commands from a controller coupled to the inverter and to the position encoder. The method also includes measuring a current from the direct current bus; and capturing the current at a predefined interval of time.
    Type: Grant
    Filed: January 23, 2002
    Date of Patent: May 9, 2006
    Assignee: Delphi Technologies, Inc.
    Inventors: Sayeed A. Mir, Dennis B. Skellenger, Roy Alan McCann, Mark Philip Colosky
  • Patent number: 6979964
    Abstract: Apparatus including a DC-DC converter that applies a variable voltage to an inductive load, such as a fan motor. The converter has a low-frequency high dynamic output impedance and applies a variable voltage from its output to the inductive load. A transient limiter, such as a capacitor, is connected in parallel with the inductive load to minimize the amplitude of transients generated by the load during the reception of the variable voltage from the converter. The converter has a low frequency of operation to inhibit the generated transients from being extended to a DC power source connected to the input of the converter. This prevents the transients from being applied to other circuits served by the DC power source. The fan may be used to provide cooling for the apparatus of which the DC-DC converter is a part.
    Type: Grant
    Filed: September 28, 2004
    Date of Patent: December 27, 2005
    Assignee: Lucent Technologies Inc.
    Inventor: Bruce C. Roe
  • Patent number: 6977477
    Abstract: Systems and methods are provided through which the current to a spindle motor of the recording medium of a mass storage device is modulated to avoid anomalies in the operation of mass storage device and reduce power consumption. In the example of a disc drive, the current is modulated to prevent expected or predicted disturbances in the air bearing between a read/write head and the recording medium, and to reduce the power consumption when no disturbances are predicted or expected.
    Type: Grant
    Filed: November 27, 2001
    Date of Patent: December 20, 2005
    Assignee: Seagate Technology LLC
    Inventors: Donald Ray Bloyer, Garry E. Korbel, Matthew E. Hastings
  • Patent number: 6970643
    Abstract: A radiator includes a voltage regulator for providing a reference voltage, a fan including a power end connected to the reference voltage via a first resistor and a feedback end for outputting a pulse signal indicating the rotation speed of the fan, an integration circuit including an output end, and an input end connected to the feedback end of the fan for converting the pulse signal from the feedback end into a voltage signal, and a thermistor connected between the output end of the integration circuit and the reference voltage, for detecting temperature changes in order to adjust the rotation speed of the fan.
    Type: Grant
    Filed: July 4, 2004
    Date of Patent: November 29, 2005
    Assignee: BenQ Corporation
    Inventor: Wei-Chun Chang
  • Patent number: 6895175
    Abstract: Systems, methods, and apparatus, consistent with principles of the present invention, allow an unmodified device, for example, a dc starter motor, that normally operates at a first voltage to function in an electrical system providing a second voltage, which is different from the first voltage, and received from the power source. A device actuator, such as a solenoid, is controlled using the second voltage. The first voltage is produced and supplied to the device in response to a first action of the actuator, for example, upon solenoid depression. This voltage is then inhibited from being provided to the device in response to a second action of the actuator, for example, upon solenoid retraction after engine cranking.
    Type: Grant
    Filed: October 1, 2001
    Date of Patent: May 17, 2005
    Assignee: Cummins, Inc.
    Inventors: David A. Fulton, Ralph H. Johnston
  • Patent number: 6891347
    Abstract: Various systems and methods are provided for cooling a cabinet. In one embodiment, a method is provided that comprises the steps of controlling a speed of the at least one cooling fan in response to a temperature of the cabinet, and, controlling the speed of the at least one cooling fan in response to a position of an access panel relative to the cabinet.
    Type: Grant
    Filed: October 9, 2002
    Date of Patent: May 10, 2005
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Robert W. Dobbs, James K. Koch, Jeremy I. Wilson
  • Patent number: 6879120
    Abstract: There is provided a brushless DC fan motor which can eliminate an oscillator for PWM, control the motor speed at a low cost with high accuracy, and efficiently adjust the temperature in a housing for electronic appliances when radiating the heat in the housing. The brushless DC fan motor with the rotational speed thereof controlled by controlling the voltage of a control input terminal of a drive circuit comprises a differential amplifier in which the voltage signal for controlling the speed is inputted in a first input terminal and the reference voltage signal is inputted in a second input terminal. The differential amplifier is linear in the input-output characteristic, and can set the rise characteristic of a desired gradient, and control the motor speed with high accuracy without using the PWM signal for the input signal. The voltage signal from the output terminal of the differential amplifier is given to the control input terminal of the drive circuit.
    Type: Grant
    Filed: February 23, 2004
    Date of Patent: April 12, 2005
    Assignee: Minebea Co., Ltd.
    Inventor: Junnan Xi
  • Patent number: 6838842
    Abstract: A brushless, synchronous direct current motor is operated by supplying a direct current voltage as an input voltage for commutating the motor phase windings. The speed of the synchronous motor is modified or varied in two speed ranges. In the first speed range, a linear change of the input voltage is carried out up to a speed threshold value. In the second speed range with higher speeds than in the first speed range, a vector modification of the input voltage is carried out, for example for controlling the speed of a fan motor.
    Type: Grant
    Filed: June 28, 2001
    Date of Patent: January 4, 2005
    Assignees: Conti Temic microelectronic GmbH, DaimlerChrysler AG
    Inventors: Hans-Peter Feustel, Reinhard Orthmann
  • Patent number: 6823132
    Abstract: In controlling a motor in a device which drives a mechanism using the motor as a power source, pre-driving of giving a predetermined driving parameter to the motor and driving the mechanism is executed. During the pre-driving, movement of the mechanism is monitored, and a command value to the motor, which is necessary for starting the mechanism, is obtained. Driving of the motor is controlled using feedback using the command value as the initial value of the driving parameter. High-speed accurate position control can be achieved independently of the individual difference in an object to be controlled and the frictional force of the mechanical portion or the difference in use environment.
    Type: Grant
    Filed: May 15, 2002
    Date of Patent: November 23, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroyuki Saito, Nobutsune Kobayashi, Michiharu Shoji
  • Patent number: 6822411
    Abstract: Control of a motor in a device in which a mechanism is driven using the motor as the power source is achieved by providing velocity servo-control means for outputting first command information regarding the motor based upon a preset velocity profile and information relating to velocity of the mechanism, and position servo-control means for outputting second command information regarding the motor based upon a preset position profile and information relating to position of the mechanism. A motor driving signal is generated, based upon the first and second command information, in a region in which the mechanism is to be accelerated in the velocity profile. As a result, target-velocity attainment time is shortened and velocity fluctuation after attainment of the target velocity is reduced.
    Type: Grant
    Filed: September 27, 2002
    Date of Patent: November 23, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventor: Nobutsune Kobayashi
  • Patent number: 6759820
    Abstract: The invention concerns an arrangement for powering a load (12) that has non-continuous power consumption from a DC power supply (UB). The arrangement has a DC link circuit (14, 22) to which said load (12) can be connected and with which is associated a capacitor (21) that is suitable for briefly supplying energy to the load. A current regulator (24, 30) is provided for connecting the DC link circuit (14, 22) to the DC power supply (UB) in order to deliver a substantially constant current (i) to said capacitor (21) and to a load (12) connected to the link circuit. The target value of said current regulator (30) is adjusted adaptively, by means of a second regulator (34), to the instantaneous power demand of the load (12). An arrangement of this kind can also be referred to as an active filter that is particularly suitable for electronically commutated motors and for motors with a PWM current controller.
    Type: Grant
    Filed: July 24, 2002
    Date of Patent: July 6, 2004
    Assignee: Papst-Motoren GmbH & Co. KG
    Inventor: Arno Karwath
  • Patent number: 6741803
    Abstract: A process and a circuit (2) for regulating the speed of an electric motor (1) having a high speed (N1) to at least one additional lower speed (N2, N3, N4), whereby, in a first prioritized step, depending on a preselected speed (N1, N2), the regulation of the speed to a lower effective motor voltage (Ueff) has an upper limit, and in a second step, depending on the torque (M) needed for the regulation to this preselected speed (N1, N2), the effective motor voltage (Ueff) is regulated within the limited range.
    Type: Grant
    Filed: August 29, 2002
    Date of Patent: May 25, 2004
    Assignee: Hilti Aktiengesellschaft
    Inventors: Claus Osselmann, Peter Hellmann, Lutz Troeder
  • Patent number: RE45897
    Abstract: A hand-held, battery powered tool (e.g., nutrunner, drill) includes an output head operatively connected to a motor, a plurality of battery cells, an ON/OFF start switch, a resistance sensor that measures a resistance of the output head to movement, and a controller. When the start switch is ON and the resistance sensed by the resistance sensor does not exceed a predetermined shift resistance, the controller automatically connects the plurality of battery cells to each other and the motor in series. When the start switch is ON and the resistance sensed by the resistance sensor exceeds the predetermined shift resistance, the controller automatically connects the plurality of battery cells to each other in parallel and to the motor.
    Type: Grant
    Filed: November 5, 2014
    Date of Patent: February 23, 2016
    Assignee: STANLEY BLACK & DECKER, INC.
    Inventors: Natalie A. Naumann, Duane R. Bookshar, Leonard V. Demchak