And Braking Patents (Class 318/258)
  • Patent number: 11154154
    Abstract: Disclosed is a split-type electric pressure cooker. The cooker comprises a cooker body and a cooker lid, the cooker body being provided with a power supply device. The split-type electric pressure cooker further comprises: a mechanical vent valve, comprising a valve seat and a valve cover, wherein the valve seat is fixedly mounted on the cooker lid, and the valve cover can be movably mounted on the valve seat; a power transmitting device mounted on the cooker body and able to be electrically connected to the power supply device; a power receiving device mounted on the cooker lid; and a motor driving device mounted on the cooker lid and electrically connected to the power receiving device, the motor driving device being used for driving the valve cover to move so as to open or close the mechanical vent valve. With the cooperation of the power transmitting device and the power receiving device, the power transmission is realized between the cooker body and the cooker lid.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: October 26, 2021
    Inventors: Feng Peng, Xingguo Yang, Rongkang Mo
  • Patent number: 10982755
    Abstract: The invention relates to a method of detecting a change in the direction of rotation of a rotatable shaft (5) based on non-direction sensitive rotational speed data, the method comprising the steps: ?determining a speed (17) of a rotatable shaft (5) of a vehicle transmission (3) based on non-direction sensitive speed data received from a non-direction sensitive rotational speed sensor (7), wherein the speed (17) of the rotatable shaft (5) is the absolute value of the rotational speed of the rotatable shaft (5); ?determining, based on the speed (17) of the rotatable shaft (5), if the duration of a first continuous time interval (20) during which the speed (17) of the rotatable shaft (5) is continually smaller than a first predetermined speed value (18) is shorter than a predetermined duration (24); and ?detecting that a change in the direction of rotation of the rotatable shaft (5) has occurred during the first continuous time interval (20) if the duration of the first continuous time interval (20) is shorter
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: April 20, 2021
    Assignee: Dana Belgium N.V.
    Inventors: Keivan Shariatmadar, Benoit J G Vandevoorde
  • Patent number: 10914841
    Abstract: Techniques for controlling an autonomous vehicle with a processor that controls operation, includes operating a Doppler LIDAR system to collect point cloud data that indicates for each point at least four dimensions including an inclination angle, an azimuthal angle, a range, and relative speed between the point and the LIDAR system. A value of a property of an object in the point cloud is determined based on only three or fewer of the at least four dimensions. In some of embodiments, determining the value of the property of the object includes isolating multiple points in the point cloud data which have high value Doppler components. A moving object within the plurality of points is determined based on a cluster by azimuth and Doppler component values.
    Type: Grant
    Filed: December 23, 2019
    Date of Patent: February 9, 2021
    Inventors: Stephen C. Crouch, Devlin Baker
  • Patent number: 10350720
    Abstract: An electric working machine comprises a motor, a switch, a drive device, a brake device, and a failure determiner. The switch is configured for operation by a user, has an on-state and an off-state. The drive device is configured to drive the motor in response to the switch being placed in the on-state. The brake device is configured to control deceleration of the motor to a stopped state in response to the switch being placed in the off-state. The failure determiner is configured to monitor deceleration of the motor during controlled deceleration and to determine whether the brake device has failed based on the monitored deceleration.
    Type: Grant
    Filed: April 4, 2017
    Date of Patent: July 16, 2019
    Inventor: Akihiro Nakamoto
  • Patent number: 10287137
    Abstract: Disclosed is a winch control apparatus for a crane, which comprises: a first compensation torque value calculation section which calculates, when a hoisting manipulation being input, based on a difference speed between a detected rotational speed and a target speed according to a manipulation amount of the hoisting manipulation, a first compensation torque value for enabling an electric motor to generate a reverse-rotation-preventing torque which is a torque in a hoisting direction and corresponding to the difference speed; and a second compensation torque value calculation section which calculates, when the hoisting manipulation being input, based on a detected load value, a second compensation torque value for enabling the electric motor to generate a load bearing torque which is a torque in the hoisting direction and necessary for bearing a load of the load value.
    Type: Grant
    Filed: February 6, 2018
    Date of Patent: May 14, 2019
    Inventors: Hiroaki Kawai, Takashi Tokuyama, Toshiaki Shimoda, Koji Inoue, Tetsuya Ogawa, Shintaroh Sasai
  • Patent number: 10256232
    Abstract: A semiconductor device provided herein includes: a semiconductor substrate; an upper main electrode provided above the semiconductor substrate; a sense anode electrode provided above the semiconductor substrate; a resistance layer provided above the semiconductor substrate and having a resistivity higher than the sense anode electrode; a lower main electrode provided below the semiconductor substrate. The semiconductor substrate includes a switching element and a sense diode. The switching element is connected between the upper main electrode and the lower main electrode. The sense diode comprises a first anode region of a p-type connected to the sense anode electrode via the resistance layer and a first cathode region of an n-type connected to the lower main electrode.
    Type: Grant
    Filed: January 10, 2018
    Date of Patent: April 9, 2019
    Inventor: Masaru Senoo
  • Patent number: 10148212
    Abstract: An inverter-converter system includes a DC source, a DC to DC boost converter, a DC link capacitor, an inverter circuit, a variable speed electric machine, and a controller. The DC to DC boost converter receives an input DC voltage from the DC source. The inverter circuit converts the variable boosted voltage to an AC voltage to drive the variable speed electric machine. The controller senses a plurality of parameters from the variable speed electric machine, and controls the DC to DC boost converter to boost up the input DC voltage to a variable output voltage based on the plurality of parameters and/or the voltage (or load) needed by the variable speed electric machine. The design of the inverter-converter system can achieve an electrical efficiency and cost savings for the overall system.
    Type: Grant
    Filed: January 6, 2017
    Date of Patent: December 4, 2018
    Inventors: Ryan Wayne Schumacher, Marcelo Andrade Dias
  • Patent number: 9981375
    Abstract: Method to move an articulated arm provided with a first end associated with a support and rotatable movement tower and with a second free end and including a plurality of segments pivoted with respect to each other and actuation members configured to make at least one of the segments rotate with respect to one other of the segments or to the support and rotatable movement tower, and where the method allows to manage and control the speed of movement of the articulated arm to determine on each occasion the speed of movement of its free end so that the latter is confined inside a predefined limit value.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: May 29, 2018
    Assignee: CIFA SPA
    Inventors: Alberto Giovanni Borroni, Paolo Francesco Ragaini, Ulrich Delogu
  • Patent number: 9748878
    Abstract: A method is performed by a drive circuit that controls a brushless motor. The brushless motor includes a rotor and a coil structure. The coil structure includes at least one coil. The circuit receives an instruction to drive the rotor in a forward direction. The circuit senses a residual direction of the rotor and a residual speed of the rotor. At least partially in response to the sensed residual direction being reverse direction which is opposite the forward direction, the circuit determines a time period as a function of the sensed residual speed, for applying a brake to the motor to slow the rotor. The brake is applied for the determined time period. After lapse of the determined time period, the circuit initiates driving the rotor to rotate in the forward direction.
    Type: Grant
    Filed: August 10, 2016
    Date of Patent: August 29, 2017
    Inventors: Edy Susanto, Ravishanker Krishnamoorthy, Sundaraiah Gurindagunta
  • Patent number: 9735715
    Abstract: A controller configured to be coupled to an electric motor. The controller including a processor programmed to receive a signal indicating a stopping command of the electric motor, and control a current such that a capacitor coupled to the electric motor is not overcharged by regenerative energy when a stopping of the electric motor has commenced, wherein controlling the current includes one of the following: upon receiving the signal indicating the stopping command of the electric motor, ramping the current down below a threshold level, or upon receiving the signal indicating the stopping command of the electric motor, forcing the current to circulate in motor windings to prevent regeneration of energy in the capacitor.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: August 15, 2017
    Assignee: Regal Beloit America, Inc.
    Inventors: Ludovic Andre Chretien, Roger C. Becerra
  • Patent number: 9713387
    Abstract: The invention relates to an electromotive furniture drive (100) for adjusting a movable part (4, 5) of a piece of furniture (1) by means of an output element, comprising a) at least one adjusting drive (7, 8) with respectively at least one electric motor, a speed reducing mechanism which is coupled thereto and which ensures that the output element is drivenly coupled and can be linearly displaced and/or rotatably moved, and when said output element reaches a predetermined position, said output element actuates an end switch and/or reference switch and/or switching means, b) at least one control device (9) and c) at least one control unit (10), said control device (9) comprising a positioning device for the output element provided with a control block with a counter and a recording device for evaluating impulses of a counter EMK of the at least one electric motor.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: July 25, 2017
    Inventor: Armin Hille
  • Patent number: 8729836
    Abstract: A control device for a hoist, which enables easy judgment of the lifetime of a brake of a hoist is provided. The time setting unit sets the time from startup of a double winding induction motor to disengagement of the brake and the time from start of engagement of the brake to stopping of the double winding induction motor in accordance with the time from the startup of the double winding induction motor to generation of torque. The time changing unit detects if power-supply frequency of a power supply is 50 Hz or 60 Hz and can change at least one of the time from the startup of the double winding induction motor to the disengagement of the brake and the time from stopping of driving of the brake to stopping of double winding induction motor in accordance with the power-supply frequency of the power supply.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: May 20, 2014
    Assignee: Kito Corporation
    Inventors: Masaharu Maruno, Daisuke Matsuo, Kazuho Furukawa
  • Patent number: 8624541
    Abstract: Regulating the speed of a two-phase switched reluctance machine (TPSRM) rotor includes selecting either a motoring mode or braking mode of operation for the TPSRM, regulating the rotor speed, when the motoring mode is selected, using a control signal cooperatively produced by a speed control feedback loop and a current control feedback loop; and regulating the rotor speed, when the braking mode is selected, using a control signal produced by the current control feedback loop without the cooperation of the speed control feedback loop. The speed control feedback loop uses an established speed control signal and a signal indicative of the rotor's speed to dynamically adjust a first parameter governing the control signal. The current control feedback loop uses an established current control signal and a signal indicative of the current flowing through a stator winding of the TPSRM to dynamically adjust a second parameter governing the control signal.
    Type: Grant
    Filed: May 1, 2012
    Date of Patent: January 7, 2014
    Assignee: Virginia Tech Intellectual Properties, Inc.
    Inventors: Krishnan Ramu, Keunsoo Ha, Sung-Yeul Park
  • Patent number: 8593097
    Abstract: A seat adjusting device for an automobile seat (1) having an electric motor (11) for generating a drive motion, wherein the electric motor is operationally coupled to a gearbox (13) for transmitting the drive motion thereof, the gearbox having a gearbox housing (19) in which gearbox elements are disposed for a step-up or step-down transmission of the motor drive motion, by means of which electric motors of lesser technical complexity can be used than previously. To this end, the invention proposes that the gearbox (13) has detection device for detecting information about the speed of at least one of the gearbox elements or detecting a variable dependent on the speed.
    Type: Grant
    Filed: July 7, 2009
    Date of Patent: November 26, 2013
    Assignee: Keiper GmbH & Co. KG
    Inventor: Andreas Diehl
  • Patent number: 8569985
    Abstract: In a wiper control apparatus, a water drop detector outputs an output signal in accordance with water drops adhering to a windshield of a vehicle. When a traveling determination portion determines that the vehicle is traveling, a first level setting portion sets a sensitivity for detecting the output signal to a first sensitivity. When the traveling determination portion determines the vehicle is not traveling, a second level setting portion sets the sensitivity for detecting the output signal to a second sensitivity that is larger than the first sensitivity. A water drop adhesion determination portion determines that water drops adhere to the windshield when a determination waiting time elapses in a state where detection of the output signal continues. A driving control portion controls a wiper driving portion to drive the wiper when the water drop adhesion determination portion determines that water drops adhere to the windshield.
    Type: Grant
    Filed: September 8, 2011
    Date of Patent: October 29, 2013
    Assignees: Denso Corporation, Mazda Motor Corporation
    Inventors: Taiji Morishita, Yasuhiro Takabe, Hiroshi Miyazaki, Katsunori Tonomyo
  • Patent number: 8400093
    Abstract: A system for detecting a backspin condition of a motor in an electrical submersible pump is disclosed herein. The system comprises a sensor mounted proximate to the motor, the sensor outputting a signal, a power cable connected between a motor and a controller, the power cable supplying a three phase AC voltage to the motor, one phase of the three phase signal having a control signal thereon; electronics connected to the sensor, the electronics receiving the signal and propagating the signal to the controller; and a computer defining the controller, the controller having a non-transitory memory, a computer processor, and a computer program product stored on the memory and executable by the processor, the computer program product performing a process of controlling the variable speed drive of the motor and a process of monitoring the signal from the sensor to determine if the motor is backspinning.
    Type: Grant
    Filed: August 26, 2010
    Date of Patent: March 19, 2013
    Assignee: Baker Hughes Incorporated
    Inventors: Dick L. Knox, Robert H. McCoy, Jerald R. Rider
  • Patent number: 8334666
    Abstract: A system for detecting a backspin condition of a motor in an electrical submersible pump is described herein. The system comprises a variable speed drive for powering the motor via a power cable; and a controller, the controller having a memory, a computer processor, and a computer program product stored on the memory and executable by the processor. The computer program product comprises the instructions of: monitoring an input current or impedance on the power cable to determine changes in motor current impedance, comparing changes in the motor current impedance to a historical threshold value for backspin events to determine whether the motor is backspinning; impeding operable power to the motor when it is determined the motor is backspinning; supplying a low AC voltage to the motor after it is determined the motor is backspinning; and determining whether or not the motor has stopped backspinning by monitoring the low AC voltage.
    Type: Grant
    Filed: August 26, 2010
    Date of Patent: December 18, 2012
    Assignee: Baker Hughes Incorporated
    Inventors: Sheldon Plitt, John M. Leuthen
  • Patent number: 8310178
    Abstract: A motor control apparatus for controlling a DC motor includes a detection unit configured to detect an angular speed of the DC motor, and a control unit configured to, when the DC motor is accelerated, increase a control value that controls a driving of the DC motor at a constant rate from a first control value corresponding to an angular speed lower than a target angular speed up to a second control value corresponding to an angular speed higher than the target angular speed, and switch the control value that controls the driving of the DC motor to a control value corresponding to the target angular speed in response to the detection result of the detection unit reaching the target angular speed.
    Type: Grant
    Filed: February 17, 2010
    Date of Patent: November 13, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yoritsugu Maeda
  • Patent number: 8217598
    Abstract: A method of driving a vibration wave motor enables proper frequency control of an AC voltage applied to the motor according to the rotational speed difference between the actual and target rotational speeds of the motor, even if frequency-rotational speed characteristics are not stored in advance. A target rotational speed of a moving member is set. A ratio of an amount of increase or decrease in a rotational speed of the moving member to an amount of update of a frequency of the AC voltage and a rotational speed difference between the target rotational speed and an actual rotational speed of the moving member are calculated. The amount of update of the frequency is calculated by dividing the calculated rotational speed difference by the calculated ratio. The frequency of the AC voltage is updated by using the calculated amount of update of the frequency.
    Type: Grant
    Filed: February 22, 2010
    Date of Patent: July 10, 2012
    Assignees: Canon Kabushiki Kaisha, Canon Precision Inc.
    Inventors: Toshihisa Komai, Makoto Shiomi
  • Patent number: 8188691
    Abstract: The present disclosure is an apparatus for controlling movement of a decoy. The apparatus for controlling movement of a decoy may include a motor and a housing. The motor may cause movement of a decoy coupled to the motor to simulate movement of an animal. The apparatus for controlling movement of a decoy may include a shaft which couples to the motor and the decoy whereby the motor may cause axial rotation of the decoy.
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: May 29, 2012
    Inventor: Steven J. Twohig
  • Publication number: 20080265810
    Abstract: The present invention relates to a DC motor for hoist machine that is essentially a design of applying DC brushless inverter motor in the hoist machine. The stator and rotor of the brushless motor are formed in such a manner that a plurality of magnets are placed with alternation in polarity into the inside of the rotor of motor to generate main magnetic field, and that a current is supplied to the windings inserted within the block made of silicon steel lamination to exert push force. The integration of the application of DC brushless inverter motor combined with the electric and electronic elements gradually brings about inverter-controlled technology with maturity, by which excellent energy-saving effect can be obtained in case of the application having variable load, due to the fact that the inverter control has better manipulation property and better features of motor-output, and possesses high torque-output and better manipulation property in low-speed of rotation running condition.
    Type: Application
    Filed: April 24, 2007
    Publication date: October 30, 2008
    Inventor: I-Te Pan
  • 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: 7053570
    Abstract: A control circuit operates a dual directional DC motor from an AC power source. A controller has first and second position indication inputs adapted to receive respective first and second position indications. The controller also has first and second direction outputs, which respectively energize one of two first relay coils having contacts outputting respective AC voltages responsive to the direction outputs. A full wave bridge rectifier receives the AC voltage and responsively outputs a DC voltage, which energizes a second relay coil. A contact thereof directs that voltage to two sets of first relay contacts, which are also responsive to the direction outputs, and which respectively provide a positive or negative DC voltage to the motor. Another second relay coil contact provides a braking action to the motor responsive to removal of the DC voltage from the rectifier output following removal of the AC voltage to the rectifier.
    Type: Grant
    Filed: December 1, 2003
    Date of Patent: May 30, 2006
    Assignee: Eaton Corporation
    Inventors: Todd M. Lathrop, Derrick G. Berad, Ronald D. Hartzel, James R. Hanna
  • Patent number: 6731082
    Abstract: A pulse width modulated (PWM) output signal controller circuit is provided for controlling operation of an electronically commutated, direct current (DC) motor. This DC motor may be used for operating cooling fans in sensitive electronic equipment. The controller circuit maintains the motor speed as constant resulting in a minimizing of the motor power consumption and resultant noise generation. Controller circuit output PWM signals are maintained at a constant pulse width even in the presence of variations in the voltage levels supplied to the controller circuit. The controller circuit includes a current pulse sensor circuit that senses changes in current direction in a motor coil. This current pulse sensor's output is input to a monostable multivibrator circuit that produces a chain of constant height output pulses (PWM signals).
    Type: Grant
    Filed: March 13, 2002
    Date of Patent: May 4, 2004
    Assignee: Pelko Electric (HK) Ltd.
    Inventor: Kosta L. Pelonis
  • Publication number: 20020135244
    Abstract: A brushless D.C. motor having a tolerance band that is used to retain the stator in the motor housing. The tolerance band has a plurality of waves formed along its length. The tolerance band is mounted within a housing groove, through which the stator is pressed. The tolerance band waves are compressed as the stator is pressed into motor housing. The compressed waves act as a radial spring to retain the stator in the housing with a minimal amount of radial force.
    Type: Application
    Filed: March 21, 2001
    Publication date: September 26, 2002
    Inventors: Scott Lewis Strong, Sunil Keshava Murthy
  • Patent number: 6268708
    Abstract: In control devices of electric power steering systems, steering characteristics are improved by control being carried out by means of a signal based on rotor speed or steering angle after failure of a torque sensor is detected.
    Type: Grant
    Filed: December 14, 1999
    Date of Patent: July 31, 2001
    Assignee: NSK Ltd.
    Inventors: Hideaki Kawada, Shuji Endo
  • Patent number: 6064162
    Abstract: An anti-regeneration circuit for preventing a regenerated current produced by an overhauling DC motor from setting a series brake. The anti-regeneration circuit includes a current blocking device 90 which blocks the flow of regenerated current in the crane control circuit 10 and a surge suppresser 94 for protecting the current blocking device 90 from a high inverse peak voltage produced by de-excitation of a crane control circuit 10 upon the sudden loss of power.
    Type: Grant
    Filed: April 27, 1998
    Date of Patent: May 16, 2000
    Assignee: Square D Company
    Inventor: Patrick J. Bowers
  • Patent number: 6025683
    Abstract: A motor control chip (62) for asserting the control signals used to regulate the energization of the windings of a DC motor. The motor control chip includes a tachometer (94) that receives pulsed signals that vary with the rotation of the motor rotor and that produces a pulse width modulated tachometer signal as a function of the motor speed. A pulse width modulator (90) receives the tachometer signal and an analog signal representative of the user-selected motor speed. Based on the received input signals, the pulse width modulator produces a variable speed control signal. A forward/reverse oscillator (92) receives user-set signals indicating if the motor should be run in the forward or reverse directions or in an oscillatory pattern. Based on the received signals, the forward/reverse oscillator asserts a forward/reverse signal having an appropriate signal state or cycle. A motor decoder (98) receives the signals produced by the pulse width oscillator and the forward/reverse oscillator.
    Type: Grant
    Filed: December 23, 1998
    Date of Patent: February 15, 2000
    Assignee: Stryker Corporation
    Inventor: Chris Philipp
  • Patent number: 5828136
    Abstract: A combined power system includes an active power source and an auxiliary power source. The rotation speed signal of the active power source and the rotation torque difference between the active power source and an output shaft of the combined power system is used as a basis for controlling the auxiliary power source to provide proportional auxiliary speed driving, or proportional auxiliary torque driving, or reverse damping from regenerative braking.
    Type: Grant
    Filed: July 23, 1996
    Date of Patent: October 27, 1998
    Inventor: Tai-Her Yang
  • Patent number: 5654613
    Abstract: The invention is made to provide a reliable driving system by solving the problem of the conventional apparatus caused by unstable current in the chopper transistor located at the low end of the field winding and armature winding. The over drive control apparatus of the direct current series motor of the present invention, including the field winding and armature winding and driven by power from the battery, comprises a chopper transistor to which the battery is applied, and an over drive contactor connected between the chopper transistor and the field windings to switch the battery power from the chopper transistor to the field winding.
    Type: Grant
    Filed: November 29, 1995
    Date of Patent: August 5, 1997
    Assignee: Samsung Heavy Industries Co., Ltd.
    Inventors: Jong Gun Kim, Seong Chul Huh, Chang Soo Lee
  • Patent number: 5261025
    Abstract: In a preferred embodiment, a high-frequency, pulse-width-modulated, power-transistor, DC motor speed controller having current limiting in both drive and regenerative modes, essentially constant ramping rates regardless of whether or not the operator switches to neutral before changing direction, a simple sequencer which controls the timing of four functions--both drive and regenerative current measuring circuits and both drive and regenerative transistors, a highly effective transistor filter capacitor arrangement, and circuitry in which the level of regenerative current is used as an input to control the current under which the direction relays switch.
    Type: Grant
    Filed: January 19, 1989
    Date of Patent: November 9, 1993
    Assignee: Curtis Instruments, Inc.
    Inventors: Stephen F. Post, David Mele
  • Patent number: 5160875
    Abstract: A power source circuit supplies positive and negative voltages to a DC motor. A first switching element is provided in a path for supplying a positive voltage from the power source circuit. A second switching element is provided in a path for supplying a negative voltage from the power source circuit. A driving circuit outputs an ON/OFF control signal for setting the first and second switching elements to opposite switching states in response to a forward/reverse rotation instruction for the DC motor. The driving circuit also outputs an OFF control signal for setting the first and second switching elements into the OFF state in response to a rotation interruption instruction. A short-circuiting circuit short-circuits both ends of the DC motor to brake the DC motor and interrupt the rotation thereof in response to the rotation interruption instruction.
    Type: Grant
    Filed: September 11, 1990
    Date of Patent: November 3, 1992
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Mitsunobu Kono
  • Patent number: 5124606
    Abstract: A driving motor, for continuous and positioning type operation, includes two different types of rotors, a main rotor and an auxiliary rotor, corresponding to the type of operation required. Both rotors are arranged within the field of a common stator and are controlled by this common stator. The common stator is controlled by a control device in accordance with the function of the rotor to be driven. The driving motor can particularly be used to drive sewing machines.
    Type: Grant
    Filed: May 31, 1990
    Date of Patent: June 23, 1992
    Assignee: Pfaff Industriemaschinen
    Inventor: Gottfried Eisenbeis
  • Patent number: 5099184
    Abstract: To provide sufficient magnetization to the field of a series motor when the series motor is to be operated in dynamic braking mode, with a dissipating resistor or short circuit element (4) connected across the armature (5), a circuit connection is established between one of the main terminals of the motor through the series field to supply a minimum magnetization current, at least when the motor operates under dynamic braking conditions, typically a few to up to 15% of no-load current of the motor. This is sufficient magnetization so that, even in larger motors where remanent magnetism of the field structure is insufficient, reliable dynamic braking can be ensured. A switch (S; S.sub.1, S.sub.2) selectively connects the motor armature for motor drive or running operation and dynamic braking operation.
    Type: Grant
    Filed: November 9, 1989
    Date of Patent: March 24, 1992
    Assignee: Robert Bosch GmbH
    Inventors: Friedrich Hornung, Arnim Fiebig, Manfred Kirn, Gunter Schaal
  • Patent number: 5017850
    Abstract: A mobile member control apparatus is provided having a motor for moving a mobile member from a first position to a third position through a second position.
    Type: Grant
    Filed: November 9, 1989
    Date of Patent: May 21, 1991
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Hiroyuki Harada, Yasumasa Matsuura, Toshihiko Araki, Tetsuji Kajitani
  • Patent number: 4985666
    Abstract: Motor control apparatus comprised of a drive circuit for supplying drive current to a motor, an overload detector coupled to the motor for detecting the magnitude of the motor current to produce an output signal if that current exceeds a predetermined threshold level caused by motor overload, and a control circuit coupled to the drive circuit and responsive to the output signal for controlling the drive current supplied to the motor, thereby controlling motor operation.
    Type: Grant
    Filed: August 28, 1989
    Date of Patent: January 15, 1991
    Assignee: Sony Corporation
    Inventor: Toshiya Nakabayashi
  • Patent number: 4904909
    Abstract: A controller for an electric clamp closes the clamp rapidly at first, then runs at a slower speed while contacting the workpiece, and speeds up again after contacting it, to close with full clamping force. Arrival of the clamp at the position for slowing down is directly detected by means of a proximity sensor, as are arrivals at other positions. The speed of operation is relatively insensitive to the voltage of its AC electrical power source because an open-loop compensating signal controls the pulse duration of rectified DC pulses that drive the motor. The controller has dynamic braking that is applied between individual pulses of pulse trains of motor current; this results in sigfificant increase in swings of current values for a given motor speed, that reduces harmful effects of mechanical friction. Two jogging speeds are selectable.
    Type: Grant
    Filed: June 29, 1988
    Date of Patent: February 27, 1990
    Assignee: Eaton Corporation
    Inventors: Donald L. V. Zeeland, Eugene F. Duncan, Gregory L. Nadolski
  • Patent number: 4851753
    Abstract: A proportional control circuit for the direction and precise speed control of D.C. electric motors such as those used to drive camera tilt/pan mountings. The circuit applies current to D.C. motors in a push/pull proportional scheme whereby slewing speed is smoothly and precisely controlled and electromotive force provides motor braking. A single current source powers the motors through an "H" bridge switching amplifier arrangement responsive to the balance between two voltage dividers, one of which includes a controlling potentiometer that regulates both direction and speed.
    Type: Grant
    Filed: June 15, 1988
    Date of Patent: July 25, 1989
    Inventor: Mark L. Hamilton
  • Patent number: 4816726
    Abstract: A method of and an arrangement for controlling the operation of a reversible D.C. electric motor including a winding having two ends each of which is connected to both the positive and negative terminals of an electric current source through respective control switches that can be selectively closed and opened in response to command signals to apply voltage differentials across the winding with attendant electric current flow through the winding in one or the opposite direction for operating the electric motor in one or the other of its senses of rotation with intervening rotation sense reversals utilize the original command signals for determining when the sense of rotation reversal would result in an excessive electric current flow through the winding.
    Type: Grant
    Filed: September 14, 1987
    Date of Patent: March 28, 1989
    Assignee: United Technologies Corporation
    Inventors: Ari M. Novis, Stuart C. Wright, Don L. Adams
  • Patent number: 4804893
    Abstract: An apparatus for an electric drive vehicle which provides linear deceleration via electrical braking. The apparatus monitors vehicle speed and adjusts the duty cycle of a chopper circuit according to look-up tables. These table correlate vehicle speed and desired deceleration rate to braking torque, thereby enabling the apparatus to maintain a preselected deceleration through the entire stopping distance and to precisely position the vehicle.
    Type: Grant
    Filed: May 11, 1987
    Date of Patent: February 14, 1989
    Assignee: Caterpillar Industrial Inc.
    Inventor: Grant C. Melocik
  • Patent number: 4776528
    Abstract: In a reel-to-reel web transport (such as a magnetic tape recorder), apparatus is provided for accurately positioning a takeup reel to receive the lead end of a web. The takeup reel is rotated in web supply and takeup directions by a brushless direct current (DC) motor. A magnetic hysteresis brake is coupled to the takeup reel when the reel is rotated in a web supply direction. The rotational position of the takeup reel to receive the lead end of a web is coincident with a stable torque equilibrium position of the DC motor.
    Type: Grant
    Filed: September 3, 1987
    Date of Patent: October 11, 1988
    Assignee: Eastman Kodak Company
    Inventor: Daniel A. West
  • Patent number: 4698567
    Abstract: Apparatus for adapting a common dc motor for use in a typewriter to drive the ribbon lift and advance functions. The motor is coupled by means of a set of gears to a shaft on which are mounted the ribbon advance gear and ribbon lift cams. Also mounted on the shaft is a slotted disk. As the motor and disk rotate, an optical sensor outputs a signal for each slot. A processor then computes the motor speed from the slot timing and issues modulated pulses to the motor to regulate its speed.
    Type: Grant
    Filed: December 27, 1985
    Date of Patent: October 6, 1987
    Assignee: Xerox Corporation
    Inventors: Johannes F. Gottwald, Dennis W. Gruber
  • Patent number: 4677356
    Abstract: A DC motor is connected across the mid-points of a bridge circuit which includes a switching device in each leg of the bridge. A forward or reverse motor direction drive current flows through the motor depending on the conducting states of the switching devices. A motor drive control device operates to produce either forward or reverse drive signals for controlling the conductivities of the bridge switching devices to thereby produce a forward or reverse motor direction drive current in response to a forward or reverse drive signal respectively. The drive control device detects and measures the level of the motor drive current and when it exceeds a predetermined target value, orders a gating circuit in the path of the forward and reverse drive signals, to invert the forward and reverse drive signals to thereby reverse the direction of the motor direction drive current. This produces a braking action. The gating circuit is preferably constructed of a plurality of EXCLUSIVE OR circuits.
    Type: Grant
    Filed: December 17, 1985
    Date of Patent: June 30, 1987
    Inventors: Haruhiro Tsuneda, Yasuzumi Yoshimura
  • Patent number: 4670694
    Abstract: A capstan motor control circuit comprises a comparing circuit for comparing an instruction voltage dependent on an instructed low-speed search mode and a rotational speed voltage dependent on a present rotational speed of a capstan motor, a circuit for detecting a rotating direction of the capstan motor and for generating a rotating direction instruction which instructs rotation in a direction opposite to a detected present rotating direction of the capstan motor, a circuit for generating a braking voltage, and a circuit responsive to an output of the comparing circuit for supplying to the capstan motor the rotating direction instruction and the braking voltage during a time period in which the rotational speed voltage is greater than the instruction voltage, and for supplying to the capstan motor the instruction voltage and a rotating direction instruction which instructs rotation in a direction identical to the present rotating direction of the capstan motor when the rotational speed voltage becomes approxi
    Type: Grant
    Filed: July 31, 1986
    Date of Patent: June 2, 1987
    Assignee: Victor Company of Japan, Ltd.
    Inventor: Hiroshi Asai
  • Patent number: 4551659
    Abstract: The trackside control includes a trackside d.c. power supply applied initially at low voltage (of selectable polarity, to determine the direction of vehicle motion along the track) and then increased (preferably with constant voltage-increase rate) to maximum supply voltage, and a trackside electrical braking load (preferably capable of forcing down at constant rate the voltage applied to it from the vehicle motor).The motor has series and (separately excited) shunt field windings, and on-board sensing and switching circuitry which (a) in motoring, either forward or reverse, sets full series field in flux addition to limited shunt field (b) in coasting, maintains field winding switch settings, and (c) in electrical braking, sets full shunt field and reduces the now decompounding series field.
    Type: Grant
    Filed: October 11, 1983
    Date of Patent: November 5, 1985
    Inventor: John D. Markham
  • Patent number: 4544869
    Abstract: The disclosure provides an electronic motor control circuit which switches and amplifies to control a bi-directional electric motor, using a symmetrical circuit, each half of which consists of five transistors. The circuit has a logic level input and motor driving power output using, for control in each direction: an input transistor; a control transistor turned on and off by the input transistor; two matched, complementary motor drive transistors (at opposite terminals of the motor) turned on and off simultaneously by the control transistor; and a lockout transistor, also actuated by the control transistor, which is operatively connected to one of the motor drive transistors in the other half of the system to prevent short circuiting.
    Type: Grant
    Filed: October 5, 1983
    Date of Patent: October 1, 1985
    Assignee: Unisen, Inc.
    Inventor: James W. Pittaway
  • Patent number: 4518902
    Abstract: The invention pertains to a control system (46) for controlling the supply of power to a motor (12) to produce plugging electrical braking and current limit control, including a circuit (60) for controlling the direction of energization of the motor (12), a circuit (88) for generating digital numbers representing command motor speeds, a circuit (14) for generating a data signal representing a plugging condition, a programmable data processor (18) for generating pulse trains in dependence on the plugging condition, and a power transistor element (40) for coupling power to the motor (12) in response to the pulse trains. By using state-of-the-art digital, integrated circuit and software technology, prior, essentially linear or discrete component technology, which is relatively unreliable, expensive and slow, need not be used.
    Type: Grant
    Filed: January 5, 1983
    Date of Patent: May 21, 1985
    Assignee: Towmotor Corporation
    Inventors: Grant C. Melocik, William Pickering
  • Patent number: 4491197
    Abstract: An SCR bridge of an elevator speed control apparatus is connected between an induction motor 5 and two (R, S) of the three-phase power supply terminals. Two diagonally opposite legs of the bridge comprise single SCR's 25, 26, and the other two legs each comprise a pair of parallel, reverse polarity SCR's 21, 22; 23, 24. The third power supply terminal is connected directly to the motor through a single switch contact 8. By appropriately controlling the switch contact and the SCR.varies.s in accordance with the difference between the actual and commanded elevator speeds, the bridge can be configured to implement three phase running during acceleration and constant speed modes, single phase running during a transitional slow down mode, and D.C. braking during a deceleration mode.
    Type: Grant
    Filed: March 18, 1983
    Date of Patent: January 1, 1985
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Muneo Nishiwaki
  • Patent number: 4489257
    Abstract: A driving and braking system having solid state switches for use with an electric motor. A first switch in series with a motor armature carries current from a power supply to the motor during the driving operation. A second switch couples a voltage from the motor armature to the first switch to render the first switch nonconductive and place the motor in a braking mode in response to a braking signal. The first switch provides armature current and couples a voltage from the motor armature to the second switch to render the second switch nonconductive and place the motor in a driving mode in response to a driving signal. The motor can be switched between the braking mode and the driving mode without bringing the motor to a stop.
    Type: Grant
    Filed: October 14, 1983
    Date of Patent: December 18, 1984
    Assignee: FMC Corporation
    Inventor: Carl E. Lindow
  • Patent number: RE45693
    Abstract: A position control apparatus includes a reverse displacement calculation unit configured to calculate a reverse displacement that represents an amount of movement made from a preceding reverse point to a current reverse point by an axis that performs a reversing motion; a reversing-time segmenting number number of consecutive occurrences of reversing motions calculation unit configured to compare the reverse displacement to a predetermined value, and, when the reverse displacement is less than the predetermined value, increase a value of a reversing-time segmenting number of consecutive occurrences of reversing motions, which is a coefficient indicating a number of segments per unit time during a reversing motion, and, when the reverse displacement is greater than or equal to the predetermined value, decrease the value of the reversing-time segmenting number number of consecutive occurrences of reversing motions; and a quadrant inversion compensation unit configured to automatically adjust a quadrant inversio
    Type: Grant
    Filed: January 7, 2013
    Date of Patent: September 29, 2015
    Assignee: OKUMA Corporation
    Inventor: Masaya Minamide