"plugging" Or Application Of Reverse Power To Motor Patents (Class 318/373)
  • Patent number: 9998052
    Abstract: The magnetic pole position of a rotary electric machine is electrically derived accurately by reducing a voltage error due to a dead time while suppressing the influence on the operation efficiency of the rotary electric machine. A control device performs dead-time compensation, and performs current feedback control in a d-q-axis vector coordinate system using a magnetic pole position computed on the basis of an induced voltage produced by rotation of a rotor or on the basis of a response component to a high-frequency observation signal applied to the rotary electric machine. In the case where the rotary electric machine is controlled by deciding current commands Id*, Iq* in the d-q-axis vector coordinate system, the rotary electric machine control device controls the rotary electric machine such that the magnitude of an armature current Ia becomes equal to or more than a lower-limit current Ia_min prescribed in advance.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: June 12, 2018
    Assignee: AISIN AW CO., LTD.
    Inventors: Arinori Shimada, Masashi Miyazaki, Subrata Saha, Keisuke Nishimura, Ken Iwatsuki
  • Patent number: 9745897
    Abstract: An APU has a gas turbine engine and a starter generator to be selectively driven by the gas turbine engine. A sensor senses windmilling of components associated with the starter generator. A lock feature limits rotation within the starter generator when windmilling is sensed. A method of operation is also disclosed.
    Type: Grant
    Filed: January 13, 2011
    Date of Patent: August 29, 2017
    Assignee: Hamilton Sundstrand Corporation
    Inventor: Jay M. Francisco
  • Patent number: 9690259
    Abstract: Provided is an electronic timepiece, including: a step motor; a motor driver; a normal drive pulse generation circuit configured to output a normal drive pulse at a designated drive rank; a rotation detection pulse generation circuit configured to output a detection pulse; a rotation detection circuit which comprises at least a first detection mode determination circuit configured to conduct determination in a first detection mode and which is configured to detect rotation or non-rotation of a rotor; a rotation determination counter circuit configured to count a number of times that the rotation has been successively detected by the rotation detection circuit; a first detection mode determination counter circuit configured to count a number of times that a detection signal generated by the detection pulse becomes a predetermined detection pattern in the first detection mode; and a drive rank selection circuit configured to designate a drive rank of the normal drive pulse based on results of the counting condu
    Type: Grant
    Filed: August 29, 2014
    Date of Patent: June 27, 2017
    Assignee: CITIZEN WATCH CO., LTD.
    Inventors: Yu Takyo, Shogo Sezaki, Toshiaki Fukushima, Daisuke Iri
  • Patent number: 9590541
    Abstract: A control system for an electronically commutated motor (401) can rotate smoothly to very low speeds without using a high resolution encoder and can respond to variations in load without excessive speed fluctuations. The control system can be applied to motors operating with low resolution encoders and motors operating with sensorless rotor position feedback. The electronic control system can vary the magnitude and frequency of the stator excitation applied to one or more stator phase windings, the electronic control system comprising a frequency setting section (402) and a magnitude setting section (403) characterized by the fact that the frequency setting section (402) is constrained to operate over a limited range of frequencies, the maximum frequency being a function which is closely related to the frequency associated with rotation of the rotor at the desired speed.
    Type: Grant
    Filed: March 26, 2012
    Date of Patent: March 7, 2017
    Assignee: TECHNELEC LTD.
    Inventors: Charles Pollock, Helen Pollock
  • Patent number: 9446922
    Abstract: A sheet transporting apparatus is provided, including a transport mechanism provided with a roller, a motor, a controller, and a measuring input unit, wherein a transport route has a curved area for inverting the sheet, and the controller is constructed such that the control on the motor is executed by a closed loop control system by using a measured value of an control output at an initial stage of the transport of a sheet from a tray, and the control on the motor is switched from the control performed by the closed loop control system to control performed by an open loop control system on condition that a preset phenomenon arises after the sheet is taken out of the tray.
    Type: Grant
    Filed: September 29, 2013
    Date of Patent: September 20, 2016
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kenji Samoto, Kenta Horade, Mitsuhiro Nozaki, Hirotaka Aoki
  • Patent number: 9379659
    Abstract: A loss-less snubber drive for a permanent magnet motor. The motor system includes a first motor phase with a primary winding and an auxiliary winding. A controllable switch is positioned between the primary winding and ground such that current passes through the primary winding to ground when the controllable switch is closed. A capacitor is configured to accumulate charge when the controllable switch is opened. The auxiliary winding is configured such that charge stored by the capacitor causes current to pass through the auxiliary winding when the controllable switch is closed.
    Type: Grant
    Filed: November 8, 2011
    Date of Patent: June 28, 2016
    Assignee: Regal Beloit America, Inc.
    Inventor: Paul S. Mullin
  • Patent number: 9305589
    Abstract: A rotation driving system and a method to determine the presence of a rotator on a turntable are provided. The rotation driving system includes an encoder to detect rotation information of a motor, and a controller to determine whether or not a rotator is present on a turntable and also, to adjust a gain of the motor according to moment of inertia of the rotator.
    Type: Grant
    Filed: July 18, 2011
    Date of Patent: April 5, 2016
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Kyu Tae Kang
  • Patent number: 8907601
    Abstract: A braking apparatus for a vehicle includes a permanent magnet synchronous motor including a rotor having a permanent magnet, and a stator capable of driving the rotor to rotate and configured to couple the rotor to each of at least a pair of wheels of the vehicle; a power accumulating portion that accumulates power to be supplied to the permanent magnet synchronous motor; a conversion control portion that converts the power of the power accumulating portion to excite the stator and control the rotation of the rotor; and an in-phase excitation control portion that applies exciting brake to the wheel by exciting the stator by supplying power in the same phase as the excitation with respect to the stator in the direction of rotation of the rotor according to the control performed by the conversion control portion, wherein the wheel is stopped by the exciting brake.
    Type: Grant
    Filed: December 24, 2012
    Date of Patent: December 9, 2014
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Akemi Okawa, Masanori Mori
  • Patent number: 8860340
    Abstract: The present invention is provided to remove dust that adhered to a cooling fan. A plurality of comparators are disposed for each of a plurality of coils, respectively, and generates a back electromotive force sensing signal denoting a comparison result by comparing a back electromotive force appearing at one end of each corresponding coil with a neutral-point voltage of the coils. A driving signal synthesis circuit generates a driving control signal used to enable the fan motor to proceed the following actions: (i) enabling the fan motor to rotate toward the opposite direction as a normal operation within a specific reverse rotation period after a driving of the fan motor is started, (ii) applying a brake to the fan motor within a braking period, and (iii) enabling the fan motor to rotate toward a direction of normal operation in a normal driving period. A driving circuit drives the fan motor.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: October 14, 2014
    Assignee: Rohm Co., Ltd.
    Inventors: Shinsuke Sano, Toshiya Suzuki
  • Patent number: 8853978
    Abstract: An electric motor drive system capture and control apparatus for energy savings has an alternating current power source electrically connected to a direct current motor. A power rectifier diode rated for the alternating current power source and the direct current motor is electrically connected in a reverse bias mode between the negative supply wire of the direct current motor and a grounded neutral conductor of the alternating current power source. A ground wire is electrically connected to the direct current motor and cross connected to a hot lag wire of the alternating current power source. The direct current motor is voltage matched to the alternating current power source. A transformer is electrically connected to the alternating current power source and the direct current motor. The system may be scaled to work with a power grid or for use in a vehicle.
    Type: Grant
    Filed: March 5, 2014
    Date of Patent: October 7, 2014
    Inventors: Steven Ross Hardison, Totada R Shantha
  • Publication number: 20140184110
    Abstract: A touch control arrangement is arranged for a container having a foldable cover being folded between an opened position and a closed position via an actuation unit. The touch control arrangement includes a power source and a touch actuator electrically linked to the power source, wherein the touch actuator is located out of the storage cavity of the container body and is arranged in such a manner that when the touch actuator is activated by a presence of a touch, the actuation unit is actuated to move the foldable cover from the closed position to the opened position.
    Type: Application
    Filed: December 28, 2012
    Publication date: July 3, 2014
    Inventor: Xin Wang
  • Patent number: 8716963
    Abstract: An actuating device for displacing a control device, such as a gate valve or other control mechanism, in particular for use in oil or gas production systems, includes a motor-gear unit and a threaded spindle drive, which is operable by said motor-gear unit. The threaded spindle drive includes at least a threaded spindle and a screw nut. The threaded spindle is displaceable in an essentially axial-direction so as to displace the control device between an advance position and a retracted position. The threaded spindle drive further includes a position holding means holding the attained position of the threaded spindle. The position holding means is directly connected to a motor shaft of the motor-gear unit so as to apply a holding torque to said motor shaft.
    Type: Grant
    Filed: August 22, 2012
    Date of Patent: May 6, 2014
    Assignee: Cameron International Corporation
    Inventors: Klaus Biester, Peter Kunow, Norbert Lenz
  • Publication number: 20130162181
    Abstract: A braking apparatus for a vehicle includes a permanent magnet synchronous motor including a rotor having a permanent magnet, and a stator capable of driving the rotor to rotate and configured to couple the rotor to each of at least a pair of wheels of the vehicle; a power accumulating portion that accumulates power to be supplied to the permanent magnet synchronous motor; a conversion control portion that converts the poser of the power accumulating portion to excite the stator and control the rotation of the rotor; and an in-phase excitation control portion that applies exciting brake to the wheel by exciting the stator by supplying power in the same phase as the excitation with respect to the stator in the direction of rotation of the rotor according to the control performed by the conversion control portion, wherein the wheel is stopped by the exciting brake.
    Type: Application
    Filed: December 24, 2012
    Publication date: June 27, 2013
    Applicant: AISIN SEIKI KABUSHIKI KAISHA
    Inventor: AISIN SEIKI KABUSHIKI KASHA
  • Patent number: 8466640
    Abstract: A method is disclosed for slowing-down control of an asynchronous machine, wherein the value of a start energy is determined and stored while the asynchronous machine is being run up from being stationary to the operating rotation speed. The asynchronous machine is braked, in the reversing mode, with braking energy which corresponds to the start energy multiplied by a correction factor wherein the correction factor assumes a value between 0 and 1. In at least one embodiment, the asynchronous machine is braked further by DC braking after braking has been carried out in the reversing mode.
    Type: Grant
    Filed: August 12, 2008
    Date of Patent: June 18, 2013
    Assignee: Siemens Aktiengesellschaft
    Inventors: Dirk Hertz, Diethard Runggaldier, Stefan Zitzler
  • Patent number: 8274245
    Abstract: An actuating device for displacing a control device, such as a gate valve or other control mechanism, in particular for use in oil or gas production systems, includes a motor-gear unit and a threaded spindle drive, which is operable by said motor-gear unit. The threaded spindle drive includes at least a threaded spindle and a screw nut. The threaded spindle is displaceable in an essentially axial-direction so as to displace the control device between an advance position and a retracted position. The threaded spindle drive further includes a position holding means holding the attained position of the threaded spindle. The position holding means is directly connected to a motor shaft of the motor-gear unit so as to apply a holding torque to said motor shaft.
    Type: Grant
    Filed: April 13, 2007
    Date of Patent: September 25, 2012
    Assignee: Cameron International Corporation
    Inventors: Klaus Biester, Peter Kunow, Norbert Lenz
  • Publication number: 20110316455
    Abstract: The method is capable of equalizing time lengths of stopping a motor at load-holding stop positions of respective phases so as to average amounts of heat generation of phase coils. The method for drive-controlling electric machinery, in which a multiphase motor is used as a driving source of an assist mechanism, is performed by a control unit including a driving circuit for driving the multiphase motor. The method is characterized in that the control unit controls to stop a rotor at a load-holding stop position, at which rotation of the rotor is stopped in a state where a motor coil is energized and the rotor is in a load-holding state, and that the load-holding stop position is angularly shifted an electric angle of 180/n (n is number of phases and an integer two or more) degrees, in a prescribed rotational direction, with respect to a previous load-holding stop position of the rotor.
    Type: Application
    Filed: June 6, 2011
    Publication date: December 29, 2011
    Applicant: SHINANO KENSHI KABUSHIKI KAISHA
    Inventor: Nobuchika Maruyama
  • Patent number: 7782006
    Abstract: To provide a motor controlling device that reduces heat generated by an armature and switching elements when an alternating motor is activated. A motor controlling device includes: an H bridge circuit 20 that has FET1 to FET4 that connect and disconnect a high potential end HV and a low potential end GND of a direct-current power supply to and from an armature Lu; and an energization control unit for controlling the amount of energization of the armature Lu by the PWM control that involves changing the ratio, in a predetermined control cycle, between an energization control period, in which the FET1 and the FET2 are turned on and the FET3 and the FET4 are turned off, or the FET3 and the FET4 are turned on and the FET1 and the FET2 are turned off, and a non-energization control period, in which the FET1 and the FET3 are turned on and the FET2 and the FET4 are turned off, or the FET2 and the FET4 are turned on and the FET1 and the FET3 are turned off.
    Type: Grant
    Filed: February 14, 2007
    Date of Patent: August 24, 2010
    Assignee: Honda Motor Co., Ltd.
    Inventors: Takeshi Misumi, Shinichiro Kobashi
  • Publication number: 20100207554
    Abstract: A method is disclosed for slowing-down control of an asynchronous machine, wherein the value of a start energy is determined and stored while the asynchronous machine is being run up from being stationary to the operating rotation speed. The asynchronous machine is braked, in the reversing mode, with braking energy which corresponds to the start energy multiplied by a correction factor wherein the correction factor assumes a value between 0 and 1. In at least one embodiment, the asynchronous machine is braked further by DC braking after braking has been carried out in the reversing mode.
    Type: Application
    Filed: August 12, 2008
    Publication date: August 19, 2010
    Inventors: Dirk Hertz, Diethard Runggaldier, Stefan Zitzler
  • Publication number: 20100127646
    Abstract: An actuating device for displacing a control device, such as a gate valve or other control mechanism, in particular for use in oil or gas production systems, includes a motor-gear unit and a threaded spindle drive, which is operable by said motor-gear unit. The threaded spindle drive includes at least a threaded spindle and a screw nut. The threaded spindle is displaceable in an essentially axial-direction so as to displace the control device between an advance position and a retracted position. The threaded spindle drive further includes a position holding means holding the attained position of the threaded spindle. The position holding means is directly connected to a motor shaft of the motor-gear unit so as to apply a holding torque to said motor shaft.
    Type: Application
    Filed: April 13, 2007
    Publication date: May 27, 2010
    Applicant: CAMERON INTERNATIONAL CORPORATION
    Inventors: Klaus Biester, Peter Kunow, Norbert Lenz
  • Patent number: 7567044
    Abstract: A braking device for an electrically driven rotor comprises a drive signal generating circuit for an electrically driven rotor, an output stage, a motor for the electrically driven rotor, driven by the output stage, and a monitor circuit for detecting interruption of an electric power supply for the motor. The output stage has a MOSFET of an upper stage side and a MOSFET of a lower side, and a diode inserted between a gate of the MOSFET of the lower stage side and the electric power supply. An electromagnetic brake is generated and applied on the electrically driven rotor when the MOSFET of the upper stage side is turned OFF and the MOSFET of the lower stage side is turned ON by a control signal from the monitor circuit, and an exciter coil of the motor is shorted when the electric power supply is interrupted.
    Type: Grant
    Filed: March 21, 2007
    Date of Patent: July 28, 2009
    Assignee: Japan Servo Co., Ltd.
    Inventor: Shuichi Matsuhashi
  • Patent number: 7423393
    Abstract: A car control apparatus including a wheel sensor, wheel torque calculating means for calculating wheel torque from the wheel speed, drive force detecting means for detecting drive force generated by an electric motor, car body drive force calculating means for calculating car body drive force from the above drive force and wheel torque, car body drive force fluctuating component extracting means for extracting multiple frequency band fluctuating components of the car body drive force, and drive or braking force control unit for controlling the running state of a car.
    Type: Grant
    Filed: May 6, 2003
    Date of Patent: September 9, 2008
    Assignee: Kabushiki Kaisha Bridgestone
    Inventors: Yasumichi Wakao, Keizo Akutagawa
  • Patent number: 7362065
    Abstract: Several embodiments of electric vehicle control and control apparatus wherein the amount of regenerative braking of the vehicle and the type of braking is determined by current conditions to provide simpler and more effective control regardless of condition of the power source for the vehicle.
    Type: Grant
    Filed: April 7, 2005
    Date of Patent: April 22, 2008
    Assignee: Yamaha Motor Electronics Co Ltd
    Inventor: Yukiyasu Takano
  • Publication number: 20070200520
    Abstract: A vehicle electronic controller comprises a load such as electric motor or one or more solenoids each connected in series to a power supply; a load state detection sensor for detecting the state of the load; a required minimum drive voltage calculation microprocessor for calculating a required minimum drive voltage which is a drive voltage to be supplied to the load and which is a required lowest voltage, based on the state of the load detected by the load state detection sensor; and a power supply relay circuit arranged between the power supply and the load for transforming a power voltage supplied from the power supply into the required minimum drive voltage calculated by the required minimum drive voltage calculation microprocessor to supply the transformed voltage as the drive voltage to the load.
    Type: Application
    Filed: February 21, 2007
    Publication date: August 30, 2007
    Inventor: Yasunori Sakata
  • Patent number: 7215093
    Abstract: A motor drive circuit includes a first transistor. The collector of a second transistor is connected to the emitter of the first transistor in series. A motor is connected to a connection point between the first and second transistors. A first brake control circuit turns off the first transistor and turns on the second transistor in accordance with a brake operation instruction signal. A second brake control circuit forces the first transistor to be turned OFF in accordance with the brake operation instruction signal independently from the first brake control circuit.
    Type: Grant
    Filed: February 27, 2004
    Date of Patent: May 8, 2007
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Kaoru Usui, Tomomitsu Oohara
  • Patent number: 7193380
    Abstract: A method for rotating a printer paper-feed roller wherein the roller is driven by a DC (direct current) motor. A feedback-control signal is applied to the motor until the roller reaches a desired rotational position. The feedback-control signal is a function of an error signal, and the error signal represents the difference between the actual rotational position and the desired rotational position of the roller. When the roller reaches the desired rotational position, the applied feedback-control signal is removed from the motor, and a direct-control biasing signal is applied to the motor to reduce or prevent rollback of the roller when the feedback-control signal is removed from the motor. In one example, the signals are PWM (pulse-width-modulated) signals.
    Type: Grant
    Filed: June 13, 2003
    Date of Patent: March 20, 2007
    Assignee: Lexmark International, Inc.
    Inventors: Barry Baxter Stout, John Thomas Writt
  • Patent number: 7157871
    Abstract: Rotation of a capstan motor is detected by a frequency detector, and supplied to a CPU as a rotation detection signal CFG. The CPU derives a period of the rotation detection signal CFG, calculates an average rotational speed of the capstan motor on the basis of the derived period, derives an attenuation value of the rotational speed on the basis of the calculated average speed, and thereby sets a braking time interval. As a result, calculation of the braking time using a highly accurate zero point detection with a frequency detector of one system becomes possible. The apparatus scale can be reduced.
    Type: Grant
    Filed: March 20, 2001
    Date of Patent: January 2, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Kazuki Azuma
  • Patent number: 7122982
    Abstract: A rotation information detection device detects rotation information of a DC motor based on a surge component waveform superimposed on a voltage waveform between the terminals of the DC motor or a current waveform of the DC motor, a circuit is provided which supplies a current of a current value Ipwm 45% during motor forward rotation or Ipwm 55% during reverse motor rotation to the motor over the period from when the motor starts braking operation to when it stops.
    Type: Grant
    Filed: May 26, 2005
    Date of Patent: October 17, 2006
    Assignee: Denso Corporation
    Inventors: Takanari Sasaya, Michiru Takahashi
  • Patent number: 7091678
    Abstract: When an angular acceleration ? of a rotating shaft of a motor connected with a drive shaft exceeds a preset threshold value ?slip, which suggests the occurrence of a skid, the torque control procedure sets a maximum torque Tmax by referring to a map, which gives a smaller maximum torque Tmax with an increase in angular acceleration ?, and restricts the motor torque to the maximum torque Tmax. The maximum torque Tmax is fixed to a value corresponding to a peak value of the angular acceleration ? at the time of occurrence of a skid. The torque control procedure then integrates the angular acceleration ? to give a time integration thereof over an integration interval when the angular acceleration ? once exceeds the preset threshold value ?slip and decreases again below the preset threshold value ?slip by the motor torque restriction.
    Type: Grant
    Filed: July 7, 2003
    Date of Patent: August 15, 2006
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Akira Hommi, Kiyotaka Hamajima, Mitsuhiro Nada
  • Patent number: 6998805
    Abstract: The invention is a motor stop control device for a rotating reel type gaming machine 1 which includes a stepping motor 70 having two pairs of excitation phases as a driving source of reels 3 having a plurality of symbols drawn thereon and in which the stepping motor is stopped in accordance with an operational instruction from outside. The device includes a deceleration transmission mechanism 700 for transmitting the rotation of the stepping motor 70 to rotating shafts for rotating the reels 3 at a predetermined reduction ratio and a main CPU 40 for performing control for reducing the rotating speed of the stepping motor 70 when a stop command for the stepping motor 70 is generated according to an operational instruction from the outside and for performing stop control of the stepping motor 70 through two-phase excitation.
    Type: Grant
    Filed: October 31, 2003
    Date of Patent: February 14, 2006
    Assignee: Aruze Corp.
    Inventors: Takao Nireki, Shingo Omono, Yuichiro Suzuki
  • Patent number: 6930458
    Abstract: An apparatus for controlling deceleration of a DC motor which is driven in a forward operating direction with a forward-drive electric current applied thereto by a forward driving device, wherein the forward motor driving device applies the forward-drive electric current in the form of pulses to the DC motor during its deceleration, and wherein a plugging-braking device operable while the motor is subjected to a regenerative brake or operated in a non-braked state is operated to apply a reverse-drive electric current in the form of pulses to the motor, to apply a plugging brake to the motor, such that at least one pulse of the reverse-drive electric current follows every predetermined number of pulses of the forward-drive electric current.
    Type: Grant
    Filed: December 17, 2002
    Date of Patent: August 16, 2005
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Shigeki Akiyama, Masatoshi Kokubo
  • Patent number: 6922032
    Abstract: In the driving operation of a sensorless three-phase motor to be used in a rotation at a comparatively low speed (approximately 2000 RPM or less) and to be bipolar driven, the number of rotations and a rotating position are accurately detected from an induced voltage and a reverse rotation brake is applied in an accurate phase, and furthermore, a short brake is applied at a set rotation number signal or less also in braking. Consequently, it is possible to prevent phase switching from being carried out in an erroneous timing and to prevent a rotation in a reverse direction by an inertia.
    Type: Grant
    Filed: January 27, 2004
    Date of Patent: July 26, 2005
    Assignee: Rohm Co., Ltd.
    Inventor: Norihiro Maeda
  • Patent number: 6831432
    Abstract: Brake mode switching signal production means detects the number of revolutions per unit time of a rotor according to a change in a positional relationship between motor windings of a plurality of phases and the rotor so as to output first and second brake mode switching signals for selecting either a short brake mode or a reverse brake mode for braking the rotation of the rotor based on the number of revolutions. Control means outputs an energization control signal for controlling energization of the motor windings of a plurality of phases in response to the first and second brake mode switching signals. Thus, it is possible to reduce the braking noise and the stopping time.
    Type: Grant
    Filed: December 3, 2002
    Date of Patent: December 14, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Maki Murakami
  • Patent number: 6531839
    Abstract: Disclosed is an optimized brake method for braking a motor rotating at a high speed. When the motor rotates at the high speed, the present invention reduces the rotation speed of the motor using a mechanical brake method which has a relatively high rate of energy exhaustion, and when the rotation speed of the motor reduces below a predetermined speed, the present invention stops the motor using an electrical brake method. Therefore, since the mechanical brake method is used during the high speed rotation interval, heat occurrence can be prevented, and the electrical brake method is used during the relatively low speed interval so that the motor can be stopped within a short time.
    Type: Grant
    Filed: March 22, 2000
    Date of Patent: March 11, 2003
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Yong-Sang Shin, Dong-Gyu Kim, Sung-Jun Joo
  • Patent number: 6459224
    Abstract: In a roller conveyor system for carrying out zone control, a conveyed article can be stopped in an approximately constant position without varying the position where the article is stopped in a desired control zone even if the weight of the article varies. In order to syop the article in a predetermined control zone, such stop control is carried out that a motor is decelerated and stopped in a plurality of braking systems depending on the change in the pulse width of a rotational pulse signal to stop the article with high precision in a predetermined stop position.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: October 1, 2002
    Assignee: Itoh Electric Company Limited
    Inventors: Kazuo Itoh, Toshiyuki Tachibana, Yoshiyuki Kujihashi
  • Patent number: 6333611
    Abstract: A motor drive apparatus is provided in an injection molding machine in order to supply electrical energy to a motor. The motor drive apparatus includes an electricity accumulation unit for accumulating electrical energy; and an electricity accumulation circuit for accumulating in the electricity accumulation unit electrical energy regenerated from the motor during a deceleration period of the motor and for supplying the electrical energy accumulated in the electricity accumulation unit to the motor during an acceleration period of the motor.
    Type: Grant
    Filed: November 5, 1999
    Date of Patent: December 25, 2001
    Assignees: Nisso Electric Company, Nissei Plastic Industrial CO, Ltd.
    Inventors: Hiroshi Shibuya, Satoshi Nishida, Atsushi Koide, Hiroshi Yamaura
  • Patent number: 6313592
    Abstract: The invention relates to a method for controlling a motor vehicle having electric drive mechanism, especially a city autobus, in which one or more wheels are driven by one electric motor and which is provided with an electric brake and a control circuit, wherein when a first defined threshold value (1) of the rotational speed (n) of the electric motor is exceeded, the drive torque (m) is cut back and is reduced down to zero when the rotational speed (n) continues to increase, and that when a second defined threshold value (3) of the rotational speed (n) which is higher than the first threshold value (1) is exceeded, the electric brake is engaged and as the rotational speed increases exerts a maximum brake torque when a limit value (4) is reached.
    Type: Grant
    Filed: October 18, 2000
    Date of Patent: November 6, 2001
    Assignee: ZF Friedrichshafen AG
    Inventors: Thomas Voss, Bernd Müller, Bert Hellwig, Gerald Karch, Werner Wolfgang
  • Patent number: 6046559
    Abstract: A motor control method stops rotation of a motor which rotates in a forward direction by applying a brake signal for rotating the motor in a reverse direction. The motor control method detects a power supply voltage, and corrects a brake signal applying time for which the brake signal is applied to the motor depending on the detected power supply voltage.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: April 4, 2000
    Assignee: Fujitsu Limited
    Inventor: Masaaki Iwasaki
  • Patent number: 6008601
    Abstract: An energization controller for an electric motor eliminates the possibility that a motor driver may be destroyed when the electric motor rotates in the opposite direction from its driving direction.
    Type: Grant
    Filed: June 1, 1998
    Date of Patent: December 28, 1999
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventor: Masanori Sugiyama
  • Patent number: 6002225
    Abstract: A method of breaking a motor includes the step of applying a pulse width modulated signal to the winding of the motor. A switching voltage is used to intermittently reverse the poles of the motor for selected time periods. The time periods are separated by pauses the duration of which is dependent upon the breaking force needed to stop the motor.
    Type: Grant
    Filed: November 7, 1996
    Date of Patent: December 14, 1999
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Gunter Gleim, Hermann Link, Michael Bildl, Friedrich Heizmann
  • Patent number: 5814958
    Abstract: A system is provided for controlling a DC motor which is constructed to propel a golf car. The motor is a shunt wound motor having independently excited armature and field windings. The basic input to the armature of the motor is supplied through a pulse modulated chopper circuit which varies the width of the pulse in response to the throttle of the golf car. Full control of the input to the field winding is gained by the supply of power to an H bridge circuit. Armature current is continuously sensed to provide an indication of the status and performance of the car during operation. At a predetermined level of armature current the field current is adjusted to provide a higher torque at a specific speed. When armature current indicates a predetermined overspeed condition, field current is adjusted to enhance regeneration and the resultant braking. In addition, the stopped condition is continuously monitored.
    Type: Grant
    Filed: December 31, 1996
    Date of Patent: September 29, 1998
    Assignee: Textron, Inc.
    Inventor: James C. Journey
  • Patent number: 5793175
    Abstract: A system is provided for controlling a D-C motor which is constructed to propel a golf car. The motor is controlled to provide performance according to a predetermined field current map which calls for a particular performance response to specified performance events. The performance events are detected by sensing actual speed and armature current and the performance response is triggered by adjustment of the field current. A performance map correlating actual speed to various events and specifying the field current response is designed for the motor used. In addition an armature current performance map is similarly constructed correlating armature current to particular performance events.
    Type: Grant
    Filed: April 11, 1997
    Date of Patent: August 11, 1998
    Assignee: Textron Inc.
    Inventor: James C. Journey
  • Patent number: 5793168
    Abstract: A circuit for driving a brushless dc motor includes an active deceleration circuit for rapidly slowing the motor. A phase locked loop senses a position of the rotor for commutating from a drive state to a next drive state in a sequence of drive states at an appropriate time for maintaining torque on the rotor in the direction of rotation. Thus, the rotor "chases" the energized windings. A speed control loop controls current in the windings and, thus, motor speed. When the speed of the motor exceeds a desired speed by more than a threshold amount, rather than commutating to a next drive state in the sequence, the circuit skips a commutation. By skipping one commutation, the current drive state is maintained while the rotor continues to turn, due to its own inertia, such that the rotor "passes up" the current drive state. This results in a torque on the rotor in a direction opposite rotation.
    Type: Grant
    Filed: August 23, 1996
    Date of Patent: August 11, 1998
    Assignee: Micro Linear Corporation
    Inventor: Mark R. Vitunic
  • Patent number: 5708333
    Abstract: A series-wound motor, wherein, for braking purposes, the polarity of the armature of the motor is reversed for the opposite direction of rotation. The current supply for the motor is maintained until the armature comes substantially to a standstill and subsequently, the current supply to the motor is interrupted. The braking time is controlled in dependence upon operating parameters. For example, the braking time can be controlled by a predetermined time constant for the interruption of the current supply. To prevent running in the opposite direction, a reversal preventing device can be provided.
    Type: Grant
    Filed: February 29, 1996
    Date of Patent: January 13, 1998
    Assignee: Robert Bosch GmbH
    Inventor: Manfred Kirn
  • Patent number: 5705903
    Abstract: An electric brake circuit (10) for bringing an alternating current (AC) motor (12) to a rapid halt. When the AC motor is turned on, a braking capacitor (C1) is charged to a preselected voltage. A shunt regulator (18) prevents the braking capacitor from overcharging by shunting charging current to ground once the braking capacitor reaches the preselected voltage. In a preferred embodiment, a limit circuit (20) turns off the charging current on the subsequent positive phase of the AC line voltage powering the electric brake. By shutting off current flow to the circuit when the preselected voltage on the capacitor is reached, power consumption and size of the circuit are minimized.
    Type: Grant
    Filed: February 12, 1996
    Date of Patent: January 6, 1998
    Assignee: Unicoil, Inc.
    Inventor: Mark E. Hastings
  • Patent number: 5642023
    Abstract: A system is provided for controlling a DC motor which is constructed to propel a golf car. The motor is a shunt wound motor having independently excited armature and field windings. The basic input to the armature of the motor is supplied through a pulse modulated chopper circuit which varies the width of the pulse in response to the throttle of the golf car. Full control of the input to the field winding is gained by the supply of power to an H bridge circuit. Armature current is continuously sensed to provide an indication of the status and performance of the car during operation. At a predetermined level of armature current the field current is adjusted to provide a higher torque at a specific speed. When armature current indicates a predetermined overspeed condition, field current is adjusted to enhance regeneration and the resultant braking. In addition, the stopped condition is continuously monitored.
    Type: Grant
    Filed: January 19, 1995
    Date of Patent: June 24, 1997
    Assignee: Textron Inc.
    Inventor: James C. Journey
  • Patent number: 5640071
    Abstract: In a circuit having an electromechanical transducer, such as a motor (22), a control switch (24) is controlled by a control circuit (26) to connect the motor to, and disconnect from, a battery (12). When control switch opens, thereby disconnecting the motor from the battery, the momentum achieved by the motor tends keep the motor turning, causing the motor to behave like a generator. A switch network (28) connects a first capacitor (30), which is initially discharged, across the motor at the same time the control switch disconnects it from the battery. The momentum of the motor, and any attached mechanical system (32), generates a transient charge which is collected by the first capacitor. When the voltage produced by the collected charge reaches a peak, the switch network disconnects the first capacitor from the motor, reorients the first capacitor, and waits to apply the voltage to the motor.
    Type: Grant
    Filed: October 10, 1995
    Date of Patent: June 17, 1997
    Inventors: Francis P. Malaspina, Simon Thomas, Sathya S. Prasad, Scott M. Garrett
  • Patent number: 5565760
    Abstract: A method and apparatus for preventing overspeed of an electrically powered golf car having a shunt wound direct current electric motor with an armature winding and a field winding serially connected to respective switching devices and to a source of on-board direct current electric power. The golf car includes a control adapted and connected to regulate the current in each of the armature and field windings for controlling speed in response to an operator's command. The golf car incorporates overspeed detection by sensing the magnitude of current in each of the armature winding and the field winding and detecting when the current in the armature winding reverses direction. The magnitude of the armature winding current upon such reversal is compared to a preselected value and an overspeed signal generated when the reverse current magnitude exceeds the preselected value.
    Type: Grant
    Filed: November 2, 1994
    Date of Patent: October 15, 1996
    Assignee: General Electric Company
    Inventors: Larry G. Ball, Patrick C. Koehl
  • Patent number: 5471123
    Abstract: A control circuit for limiting the current flow to a direct-current driven motor, to reduce current spikes at motor start up, including a voltage-regulated, current-passing device for passing current from a direct voltage source to the motor, the device having a default configuration such as to permit full current flow there-across when the voltage is initially applied, a voltage drop device interposed the voltage source and the voltage-regulated, current-passing device responsive to the current flow to the motor and a variable-voltage output device responsive to the voltage drop developed in the voltage-drop device for providing a subsequently changing voltage for input to the current-passing device for limiting the current flow therethrough following initial application of the voltage.
    Type: Grant
    Filed: March 16, 1995
    Date of Patent: November 28, 1995
    Assignee: ETI Systems
    Inventor: Bill Tice
  • Patent number: 5386185
    Abstract: An apparatus comprising, in combination, an AC motor, a solid state switch controlling the AC motor, the solid state switch switchable between an on state in which an electric current flows through the solid state switch and an off state in which electric current does not flow through the solid state switch, the solid state switch characterized by a turn off time such that, when the solid state switch is switched between the on state and the off state, at least a portion of the electric current flows through the solid state switch during the turn off time, a first switch circuit for switching off the solid state switch to prevent the electric current from flowing to the AC motor, a diode bridge coupled across the AC motor, a second switch circuit for controllably switching the diode bridge between an active state in which electric current may flow through the diode bridge and an inactive state in which electric current may not flow through the diode bridge, a control circuit for controlling the second switch
    Type: Grant
    Filed: May 17, 1993
    Date of Patent: January 31, 1995
    Assignee: General Motors Corporation
    Inventors: Lawrence R. Beck, Joseph J. Franko, Daniel L. King
  • Patent number: RE36454
    Abstract: A method and apparatus for preventing overspeed of an electrically powered .[.golf car.]. .Iadd.vehicle .Iaddend.having a shunt wound direct current electric motor with an armature winding and a field winding serially connected to respective switching devices and to a source of on-board direct current electric power. The .[.golf car.]. .Iadd.vehicle .Iaddend.includes a control adapted and connected to regulate the current in each of the armature and field windings for controlling speed in response to an operator's command. The .[.golf car.]. .Iadd.vehicle .Iaddend.incorporates overspeed detect sensing the magnitude of current in each of the armature winding and the field winding and detecting when the current in the armature winding reverses direction. The magnitude of the armature winding current upon such reversal is compared to a preselected value and an overspeed signal generated when the reverse current magnitude exceeds the preselected value.
    Type: Grant
    Filed: July 10, 1997
    Date of Patent: December 21, 1999
    Assignee: General Electric Company
    Inventors: Larry Gene Ball, Patrick Charles Koehl