Locally Closed Armature Circuit Patents (Class 318/379)
  • Patent number: 10530147
    Abstract: A control device for an electrical device such as an electric motor is provided. The control device is designed to, when necessary, bring about a safe, torque-free state of an electric motor, in particular a field-weakened electric motor. The control device includes a safety unit which is designed to generate safety control signals.
    Type: Grant
    Filed: October 14, 2014
    Date of Patent: January 7, 2020
    Assignee: Schmidhauser AG
    Inventors: Alex Itten, Bernhard Laeng
  • Patent number: 10461679
    Abstract: A method and apparatus for catching a rotating motor is described. Switches (typically the lower switches) of an inverter of a motor drive circuit are short-circuited for a brief period of time. The pulses generated by this process are analyzed to determine the speed and direction of rotation of the motor. The pulses are checked to determine whether they are orthogonal. If they are, the motor velocity determination is deemed to be reliable and then motor is magnetized and normal motor control can be resumed. If not, the motor velocity determination is deemed to be unreliable and a magnetization pulse before the velocity determination step is repeated.
    Type: Grant
    Filed: January 4, 2017
    Date of Patent: October 29, 2019
    Assignee: Danfoss Power Electronics A/S
    Inventors: Leandro Della Flora, Anton Smith
  • Patent number: 10436194
    Abstract: A motor-driven compressor includes a compression unit that includes movable and fixed scrolls and a compression chamber, an electric motor that includes a rotor and drives the compression unit, a motor drive circuit that drives the electric motor, an injection port that draws intermediate pressure refrigerant into the compression chamber, a controller that performs rotation control on the rotor, and a voltage detector that detects a terminal voltage of the electric motor. The compression unit compresses low pressure refrigerant drawn into the compression chamber to discharge high pressure refrigerant. The controller is configured to output a stop instruction to deactivate the rotation control of the rotor, determine a rotation condition of the rotor based on the voltage detected by the voltage detector after outputting the stop instruction, and perform, based on the determination, restart preparation control that includes outputting a lock instruction to electrically stop rotation of the rotor.
    Type: Grant
    Filed: November 17, 2014
    Date of Patent: October 8, 2019
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventor: Yoshiki Nagata
  • Patent number: 10411618
    Abstract: An air conditioner, a method and a device for controlling a compressor in the same are disclosed in the present disclosure. The method includes: during a shutdown process of the air conditioner, controlling a drive circuit of the compressor to short three phase windings of the compressor if receiving a stop signal for stopping the compressor; and controlling a rotor of the compressor to stop according to a brake torque generated by shorting the three phase windings, to stop the compressor. The method shorts the three phase windings by controlling the drive circuit, thus to generate the brake torque to control the rotor to stop faster. As a result, the method enables the compressor to stop and to stay still rapidly, thereby facilitating to reduce a piping stress in the air conditioner and to prolong a working life of a pipe in the air conditioner.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: September 10, 2019
    Assignee: GD MIDEA AIR-CONDITIONING EQUIPMENT CO., LTD.
    Inventors: Zhaobin Huang, Guozhu Zhang, Lianghong Zhu
  • Patent number: 10326385
    Abstract: In one aspect of the present disclosure, an electric working machine includes a three-phase brushless motor, a first switching element, a second switching element, a third switching element, a fourth switching element, a fifth switching element, a sixth switching element, a rotation detector, a brake controller. The brake controller executes a two-phase short-circuit brake. The two-phase short-circuit brake is executed so as to switch any of the fourth switching element, the fifth switching element, and the sixth switching element to a corresponding ON-state or an OFF-state in response a detection signal from the rotation detector that occurs prior to a switching time.
    Type: Grant
    Filed: May 30, 2018
    Date of Patent: June 18, 2019
    Assignee: MAKITA CORPORATION
    Inventor: Yoshitaka Ichikawa
  • Patent number: 10291161
    Abstract: A brushless motor device configured to: determine a first upper limit of a current value which flows through a coil when a rotation speed of a rotor is accelerated from a first speed to a second speed, wherein, in a case where the current value of the first upper limit flows through the coil when the rotor is rotated at the second speed, a first time period, which is from a start of a non-energization time period of the coil until an induced voltage reaches a threshold value, is longer than a second time period, which is from the start of the non-energization time period until a counter-electromotive voltage becomes zero; and change switching of each switching element of an inverter circuit by using a second upper limit greater than the first upper limit and the first upper limit.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: May 14, 2019
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Tasuku Sugimoto, Hironori Hirata, Masafumi Ito
  • Patent number: 10243488
    Abstract: An electric working machine in one aspect of the present disclosure includes a motor, a first switching element, a second switching element, a rectifier element, and a controller. The controller is configured to perform a stop control, in which completion of a first current path is maintained via the first switching element for a specified period and a second current path is interrupted via the second switching element, in response to satisfaction of a stop condition for stopping power supply from a power source to the motor during rotation of the motor.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: March 26, 2019
    Assignee: MAKITA CORPORATION
    Inventor: Michisada Yabuguchi
  • Patent number: 9673744
    Abstract: The invention relates to an operating state circuit for actuating an inverter (3), which supplies an n-phase electrical machine (5) with an n-phase supply voltage via phase connections (4a, 4b, 4c), wherein n?1, comprising an evaluation device (6) which is connected to the phase connections (4a, 4b, 4c) of the inverter (3) and which is configured to detect output voltages of the inverter (3) to the phase connections (4a, 4b, 4c) and to determine a speed of the electrical machine (5) on the basis of the detected output voltages, and an actuating device (7) which is coupled to the evaluation device (6) and which is configured to switch to an idle state or an active short-circuit in dependence on the determined speed of the inverter (3).
    Type: Grant
    Filed: June 12, 2012
    Date of Patent: June 6, 2017
    Assignee: Robert Bosch GmbH
    Inventors: Edwin Eberlein, Andreas Schoenknecht, Daniel Raichle
  • Patent number: 9525367
    Abstract: A fan motor braking apparatus and a method of controlling the same provide a braking protection before the fan motor revolves. The fan motor braking apparatus includes a conversion circuit, a braking enable circuit, a braking release circuit, and a fan motor startup circuit. The conversion circuit has a plurality of power switch elements electrically connected to the fan motor. The braking enable circuit is connected to the conversion circuit and the braking release circuit is connected to the braking enable circuit. The fan motor startup circuit receives an external DC voltage. The braking enable circuit generates a braking control signal to turn on the power switch elements when the braking enable circuit receives the external DC voltage, thus braking the fan motor.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: December 20, 2016
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Wei-Shuo Tseug, Chia-Feng Wu, Ming-Lung Liu, Yu-Jen Liang
  • Patent number: 9255677
    Abstract: The present disclosure relates to a multi-tiered lighting system that has a pole and at least two light sources. A first light source is mounted to the pole at a first height, and a second light source is mounted to the pole at a second height that is substantially different than the first height. The first light source is configured to project a first beam of light that primarily lights up a first portion of a target coverage area, and the second light source is configured to project a beam of light that primarily lights up a second portion of the target coverage area, which is different from the first target coverage area. The first beam of light may spill onto the second target area, and the second beam of light may spill onto the first target area.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: February 9, 2016
    Assignee: Cree, Inc.
    Inventors: Paul Pickard, John Wesley Durkee
  • Publication number: 20150137717
    Abstract: One aspect of an embodiment of the present disclosure is a braking apparatus for an electric power tool that includes a switching circuit with six switching elements and a brake control unit. The brake control unit switches any one selected switching element of three switching elements forming one selected switch group of a high-side switch group and a low-side switch group to an off state from an on state at a timing at which braking current flows through a diode connected in parallel to the selected switching element upon turn-off of the selected switching element.
    Type: Application
    Filed: November 13, 2014
    Publication date: May 21, 2015
    Inventors: Goshi ISHIKAWA, Itsuku KATO
  • Publication number: 20150108928
    Abstract: A motor controller for an electric motor having a stator and a rotor. The motor controller includes a power input for receiving AC power from a power source; a control input for receiving a control signal from a control; and circuitry for switching power from the power source to the electric motor in response to the control signal. The circuitry is operable to: apply a braking waveform to the stator while the rotor is rotating; monitor a reactive power of the stator; detect an increase in the reactive power of the stator to determine the rotor has substantially stopped rotating; and remove the braking waveform from the stator in response to detecting the increase in the reactive power.
    Type: Application
    Filed: December 29, 2014
    Publication date: April 23, 2015
    Inventors: Darko Marcetic, Thomas J. Sheahan
  • Patent number: 9013127
    Abstract: One embodiment of a drive system may include a motor shaft coupled to a gear set in connection between an input shaft and an output shaft. The system may also have a direct current motor selectively holding the motor shaft in a fixed position for engaging the input and output shafts to one another in response to a sudden power loss from a main power supply. The system may further include an auxiliary power supply enabling the direct current motor to provide a resistive torque.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: April 21, 2015
    Assignee: Ford Global Technologies, LLC
    Inventors: Brian D. Rutkowski, David John Rutkowski
  • Patent number: 9007003
    Abstract: The present disclosure relates to a method of controlling an inverter for driving a swing motor, and particularly, maximally generates braking torque of the swing motor upon generation of failure of the inverter by switching on/off a lower-phase switch or an upper-phase switch of the inverter in order to prevent an upper swing body from freely rotating which is generated when a semiconductor switch of the inverter is switched off upon the generation of over-current and over-voltage of the inverter that drives the swing motor, thereby being capable of protecting the inverter, rapidly stopping the upper swing body, and preventing the risk of accidents.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: April 14, 2015
    Assignee: Doosan Infracore Co., Ltd.
    Inventor: Chang Hyun Kim
  • Patent number: 8947028
    Abstract: Disclosed are a method and system for detecting a fault of a parallel coil type permanent magnet motor. This method includes driving a parallel coil type motor on the basis of a pre-defined current reference value, detecting a phase current vector of the motor, and calculating a current compensation value for removing a negative sequence component of the motor on the basis of the phase current vector.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: February 3, 2015
    Assignee: Korea Electronics Technology Institute
    Inventors: Bon Gwan Gu, In Soung Jung, Jun Hyuk Choi, Joon Sung Park, Jin Hong Kim
  • Patent number: 8922142
    Abstract: A motor controller for an electric motor having a stator and a rotor. The motor controller includes a power input for receiving AC power from a power source; a control input for receiving a control signal from a control; and circuitry for switching power from the power source to the electric motor in response to the control signal. The circuitry is operable to: apply a braking waveform to the stator while the rotor is rotating; monitor a reactive power of the stator; detect an increase in the reactive power of the stator to determine the rotor has substantially stopped rotating; and remove the braking waveform from the stator in response to detecting the increase in the reactive power.
    Type: Grant
    Filed: October 22, 2012
    Date of Patent: December 30, 2014
    Assignee: Nidec Motor Corporation
    Inventors: Darko Marcetic, Thomas J. Sheahan
  • Patent number: 8917038
    Abstract: A motor control device has a drive circuit that drives an electric motor with a battery as a power supply, a switch element that is provided between the battery and the drive circuit, the switch element supplying a current from the battery to the drive circuit when being turned on, the switch element cutting off the current from the battery to the drive circuit when being turned off, a rotation speed detector that detects a rotation speed of the electric motor, and a controller that operates the drive circuit to control the electric motor. The controller turns on the switch element when the rotation speed of the electric motor, which is detected by the rotation speed detector, is greater than or equal to a first predetermined value during stopping of the control of the electric motor.
    Type: Grant
    Filed: August 8, 2012
    Date of Patent: December 23, 2014
    Assignee: Omron Automotive Electronics Co., Ltd.
    Inventors: Takayuki Fukuoka, Yoshiki Yamagishi, Satoshi Kido, Yasutaka Shirota
  • Publication number: 20140368133
    Abstract: An electric working machine including: a motor; a driving unit configured to be driven by the motor; a trigger switch configured to allow rotation of the motor; a power supply unit configured to supply electric power to the motor; and a control unit configured to control rotation of the motor, characterized in that: the electric working machine further comprises a switching element configured to perform short-circuiting between terminals of the motor to apply electronic braking, wherein the control unit is configured to perform adjustment of the braking by controlling the switching element when stopping the motor.
    Type: Application
    Filed: February 15, 2013
    Publication date: December 18, 2014
    Inventors: Yasushi Nakano, Yuki Horie, Hirohisa Tomita, Kazuhiko Funabashi
  • Patent number: 8872458
    Abstract: A motor control device has a drive circuit that drives an electric motor with a battery as a power supply, a switch element that is provided between the battery and the drive circuit, the switch element supplying a current from the battery to the drive circuit when being put into an on state, the switch element cutting off the current from the battery to the drive circuit when being put into an off state, a voltage detector that detects a voltage at the drive circuit, and a controller that operates the drive circuit to control the electric motor. The controller turns on the switch element when the voltage at the drive circuit, which is detected by the voltage detector, is greater than or equal to a first predetermined value during stopping of the control of the electric motor.
    Type: Grant
    Filed: August 8, 2012
    Date of Patent: October 28, 2014
    Assignee: Omron Automotive Electronics Co., Ltd.
    Inventors: Takayuki Fukuoka, Yoshiki Yamagishi, Satoshi Kido, Yasutaka Shirota
  • Patent number: 8847525
    Abstract: To provide a motor control device which can apply an electric brake to a motor when power supply is stopped, and achieve a miniaturization and a cost reduction. A first switch 11 through a sixth switch 16 connects respective coils L1, L2 and L3 included in a motor to an electric power source 20. The capacitor C accumulates the power supplied from the electric power source 20. A seventh switch 17 connects the capacitor C to a fourth switch 14 through the sixth switch 16, when the power supply from the electric power source 20 is stopped. The operation of the seventh switch 17 causes the fourth switch 14 through the sixth switch 16 to operate by the power accumulated in the capacitor C, and respective coils L1 to L3 are short-circuited to apply the brake to the motor.
    Type: Grant
    Filed: January 23, 2013
    Date of Patent: September 30, 2014
    Assignee: Sanyo Denki Co., Ltd.
    Inventors: Noriaki Taniguchi, Takahisa Toda, Yo Muramatsu
  • Publication number: 20140239859
    Abstract: The invention relates to a motor drive for an on-load tap changer with an electrical DC motor and a braking device for denned braking of this motor. According to the invention, the braking device has a first diode (D1), which, depending on the direction of rotation, is connected in series with or in opposition to the armature winding (AW) of the DC motor. In accordance with a further feature of the invention, the braking device has a second diode (D2), which is connected permanently in parallel with the shunt winding (NW) of the DC motor.
    Type: Application
    Filed: October 18, 2012
    Publication date: August 28, 2014
    Inventor: Dieter Poliwczyk
  • Publication number: 20140191624
    Abstract: Certain embodiments are directed to devices, methods, and/or systems that use electrical machines.
    Type: Application
    Filed: June 8, 2012
    Publication date: July 10, 2014
    Applicant: Axiflux Holdings Pty Ltd.
    Inventor: David Elias Jahshan
  • Patent number: 8736219
    Abstract: The invention relates to an industrial robot having a robotic arm. The robotic arm has several axes (A1-A6) and at least one electric drive, which comprises an electric motor (7-12) and power electronics (16) actuating the electric motor (7-12) and is equipped to move the relevant axis (A1-A6). The industrial robot (1) is equipped to short-circuit the electric motor (7-12) in the event of emergency braking simultaneously by means of two independent electric current paths.
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: May 27, 2014
    Assignee: KUKA Laboratories GmbH
    Inventors: Josef Hofmann, Richard Schwarz, Sönke Marx
  • Patent number: 8736205
    Abstract: A switching device and method are disclosed for terminating a braking process of a three-phase AC motor. The braking process of the AC motor is performed by way of a first and second thyristor. During the braking process of the AC motor, in a first step the first thyristor is actuated in such a way that a braking current is fed to the AC motor, and therefore a torque which brakes the AC motor is produced. In a second step the second thyristor is actuated in such a way that, when the first thyristor is quenched, the braking current is taken on by the second thyristor and the braking torque is maintained. The two steps are repeated during the braking process; wherein the second step is suppressed during the braking process after a last actuation of the first thyristor.
    Type: Grant
    Filed: November 17, 2010
    Date of Patent: May 27, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventors: Dirk Hertz, Johann Seitz, Stefan Zitzler
  • Publication number: 20140111124
    Abstract: A motor controller for an electric motor having a stator and a rotor. The motor controller includes a power input for receiving AC power from a power source; a control input for receiving a control signal from a control; and circuitry for switching power from the power source to the electric motor in response to the control signal. The circuitry is operable to: apply a braking waveform to the stator while the rotor is rotating; monitor a reactive power of the stator; detect an increase in the reactive power of the stator to determine the rotor has substantially stopped rotating; and remove the braking waveform from the stator in response to detecting the increase in the reactive power.
    Type: Application
    Filed: October 22, 2012
    Publication date: April 24, 2014
    Applicant: Nidec Motor Corporation
    Inventors: Darko Marcetic, Thomas J. Sheahan
  • Patent number: 8698430
    Abstract: A variable speed switch includes a switch main body portion which is accommodated in a housing of an electric power tool and mounted to the housing so as to be capable of relative movement, and a load sensor which is provided in the switch main body portion and capable of outputting an electric signal in proportion to the amount of distortion caused by a pressing force. The switch operating portion is mounted on the surface of the housing so as to be capable of relative displacement with respect to the housing and transmits a pressing force applied to the switch operating portion to the load sensor, with the maximum displacement amount of the switch operating portion being set to equal to or less than 5 mm.
    Type: Grant
    Filed: September 6, 2011
    Date of Patent: April 15, 2014
    Assignee: Makita Corporation
    Inventors: Masahiro Watanabe, Takuya Kusakawa, Hidenori Nagasaka
  • Patent number: 8659244
    Abstract: A variable speed switch includes a switch main body portion which is accommodated in a housing of an electric power tool and mounted to the housing so as to be capable of relative movement, and a load sensor which is provided in the switch main body portion and capable of outputting an electric signal in proportion to the amount of distortion caused by a pressing force. The switch operating portion is mounted on the surface of the housing so as to be capable of relative displacement with respect to the housing and transmits a pressing force applied to the switch operating portion to the load sensor, with the maximum displacement amount of the switch operating portion being set to equal to or less than 5 mm.
    Type: Grant
    Filed: September 6, 2011
    Date of Patent: February 25, 2014
    Assignee: Makita Corporation
    Inventors: Masahiro Watanabe, Takuya Kusakawa, Hidenori Nagasaka
  • Publication number: 20130271046
    Abstract: Representative embodiments of a system for braking a cyclically rotating motor upon a power failure include (i) charge-storage circuitry for storing charge and converting the stored charge to an output voltage upon power failure; (ii) one or more passive electrical elements for conducting current induced by motor rotations; and (iii) voltage-actuated circuitry connected to the passive electrical element and the charge-storage circuitry for braking the motor during each half-cycle of motor rotation. The circuitry is inactive until actuated by the charge-storage circuitry upon power failure.
    Type: Application
    Filed: April 13, 2012
    Publication date: October 17, 2013
    Inventor: Michael Sussman
  • Publication number: 20130241450
    Abstract: A switching device and method are disclosed for terminating a braking process of a three-phase AC motor. The braking process of the AC motor is performed by way of a first and second thyristor. During the braking process of the AC motor, in a first step the first thyristor is actuated in such a way that a braking current is fed to the AC motor, and therefore a torque which brakes the AC motor is produced. In a second step the second thyristor is actuated in such a way that, when the first thyristor is quenched, the braking current is taken on by the second thyristor and the braking torque is maintained. The two steps are repeated during the braking process; wherein the second step is suppressed during the braking process after a last actuation of the first thyristor.
    Type: Application
    Filed: November 17, 2010
    Publication date: September 19, 2013
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Dirk Hertz, Johann Seitz, Stefan Zitzler
  • Publication number: 20130200825
    Abstract: To provide a motor control device which can apply an electric brake to a motor when power supply is stopped, and achieve a miniaturization and a cost reduction. A first switch 11 through a sixth switch 16 connects respective coils L1, L2 and L3 included in a motor to an electric power source 20. The capacitor C accumulates the power supplied from the electric power source 20. A seventh switch 17 connects the capacitor C to a fourth switch 14 through the sixth switch 16, when the power supply from the electric power source 20 is stopped. The operation of the seventh switch 17 causes the fourth switch 14 through the sixth switch 16 to operate by the power accumulated in the capacitor C, and respective coils L1 to L3 are short-circuited to apply the brake to the motor.
    Type: Application
    Filed: January 23, 2013
    Publication date: August 8, 2013
    Applicant: SANYO DENKI CO., LTD.
    Inventor: SANYO DENKI CO., LTD.
  • Patent number: 8487560
    Abstract: An electric brake system for an electromechanical machine connected to output terminals of an inverter, input terminals of which are supplied by a DC voltage source. The system includes an electrical circuit connected between the input terminals of the inverter and including, connected in series: a mechanism dissipating electrical energy returned by the electromechanical machine to the input terminals of the inverter during a braking phase of the electromechanical machine, including an inductor wound around a magnetic circuit; and a switching mechanism to close the electrical circuit during a braking phase of the electromechanical machine and to open the electrical circuit in absence of a braking phase of the electromechanical machine.
    Type: Grant
    Filed: November 12, 2009
    Date of Patent: July 16, 2013
    Assignee: Hispano Suiza
    Inventor: Eric De Wergifosse
  • Patent number: 8482230
    Abstract: The present invention relates to an electric device for driving mechanical equipment comprising an alternating current motor and an inverter, the said inverter comprising, for each phase of the said motor, an H bridge structure comprising four switching elements distributed over two branches connecting two terminals of the said H bridge structure and intended to supply the winding of the said at least one phase of the motor, the said winding being a winding with a mid point and the said electric device being characterized in that it also comprises, for each phase of the said motor, an energy storage unit, in particular a supercondenser, connected, on the one hand, to the mid point of the winding of the concerned phase of the motor and, on the other hand, to a terminal of the H bridge structure supplying the said winding.
    Type: Grant
    Filed: June 21, 2011
    Date of Patent: July 9, 2013
    Assignee: Valeo Systemes de Controle Moteur
    Inventors: Boris Bouchez, Luis de Sousa
  • Publication number: 20130154525
    Abstract: An assembly comprising a movable element being movable in relation to a base, a first electric motor for moving the element in relation to the base, the motor having one or more first windings each having at least two inputs, a first braking element being adapted to determine whether power and/or signals are provided to the first motor and being adapted to alter between at least two modes wherein, in a first of the modes, no power/signals is/are provided to the first motor and a first galvanic connection is provided between the inputs of at least one of the first windings and a first element having a predetermined resistance and wherein in a second of the modes, power/signals is/are provided to the first motor and the first galvanic connection is disconnected.
    Type: Application
    Filed: August 31, 2011
    Publication date: June 20, 2013
    Applicant: THRANE & THRANE A/S
    Inventor: Lars Theil Hansen
  • Patent number: 8466641
    Abstract: The invention relates to a method for decelerating a drive movement of a power tool and to a power tool suitable for carrying out the method, having a drive driven by a motor, an energy supply device for the provision of electrical energy, a controller having a motor controller for activating the motor and an operating-state recognition module which is to detect at least one operating-state variable and, as a function of this, to output a brake signal, the controller being designed to initiate, as a function of the brake signal, a braking procedure in which brake cycles are provided which have a first time segment, in which the motor is short-circuited, and a second time segment in which current is fed to the motor opposite to its original direction of rotation.
    Type: Grant
    Filed: July 20, 2011
    Date of Patent: June 18, 2013
    Assignee: C. & E. Fein GmbH
    Inventors: Michael Kaufmann, Ulf Rinckleb
  • Patent number: 8395335
    Abstract: A drive system for an electric drive machine having an engine, a generator, a motor, final drive wheels and auxiliary devices is provided. The drive system may include an inverter circuit and an auxiliary driver. The inverter circuit may be coupled to each of the generator and the motor. The auxiliary driver may be coupled to each of the generator and the auxiliary devices. The inverter circuit and the auxiliary driver may be configured to automatically communicate power from the engine and any power from the auxiliary devices to the motor in a propel mode, and automatically communicate power from the motor to the engine, and optionally to a hybrid system if applicable, in a dynamic braking mode so as to minimize fuel consumption during the dynamic braking mode.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: March 12, 2013
    Assignee: Caterpillar Inc.
    Inventors: David Marchand, Dustin Selvey
  • Publication number: 20120326638
    Abstract: The present disclosure relates to a method of controlling an inverter for driving a swing motor, and particularly, maximally generates braking torque of the swing motor upon generation of failure of the inverter by switching on/off a lower-phase switch or an upper-phase switch of the inverter in order to prevent an upper swing body from freely rotating which is generated when a semiconductor switch of the inverter is switched off upon the generation of over-current and over-voltage of the inverter that drives the swing motor, thereby being capable of protecting the inverter, rapidly stopping the upper swing body, and preventing the risk of accidents.
    Type: Application
    Filed: December 23, 2010
    Publication date: December 27, 2012
    Applicant: DOOSAN INFRACORE CO., LTD.
    Inventor: Chang Hyun Kim
  • Publication number: 20120319627
    Abstract: An electrodynamic braking device for a universal motor includes a field winding configured to be fed from a grid during a braking operation, and an armature that is configured to be directly short-circuited. A braking process is performed by means of control electronics. Good braking is achieved with relatively low brush wear. Such an electrodynamic braking device can be used effectively for a power tool.
    Type: Application
    Filed: December 22, 2010
    Publication date: December 20, 2012
    Applicant: Robert Bosch GmbH
    Inventor: Hans Hermann Rottmerhusen
  • Patent number: 8324846
    Abstract: A retarding system for an electric drive machine (100) includes a direct current (DC) link (312), at which a DC voltage is developed, disposed between a rectifier (206) and an inverter (208). A first contactor switch (216) electrically communicates with a first rail of the DC link (312), and a second contactor switch (216) electrically communicates with a second rail of the DC link (312). A first resistor grid (214) is connected in series between the first contactor switch (216) and the second contactor switch (216). The first resistor grid (214) dissipates electrical energy in the form of heat by conducting a current between the first rail and the second rail of the DC link (312) when the first contactor switch (216) and the second contactor switch (216) are closed.
    Type: Grant
    Filed: September 15, 2008
    Date of Patent: December 4, 2012
    Assignee: Caterpillar Inc.
    Inventors: David G. Marchand, Matthew E. Williams, Gerald Brown, John Gunzburger
  • Patent number: 8319458
    Abstract: Methods and systems for operating an inverter coupled to an electric motor are provided. The inverter has a plurality of high switches and a plurality of low switches coupled to the electric motor. An event indicative of deceleration of the electric motor is detected. The inverter is alternated between a first mode of operation and a second mode of operation during the deceleration of the electric motor. In the first mode of operation, each of the plurality of high switches is activated and each of the plurality of low switches is deactivated. In the second mode of operation, each of the plurality of low switches is activated and each of the plurality of high switches is deactivated.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: November 27, 2012
    Assignee: GM Global Technology Operations LLC
    Inventors: Silva Hiti, Steven E. Schulz, Konstantin S. Majarov, Brian A. Welchko
  • Patent number: 8299735
    Abstract: A fan system including a motor with a coil, a storage unit, a driver, and a buffer circuit is provided. The coil module has a first connection terminal and a second connection terminal. The storage unit electrically couples with a voltage source, stores electrical energy when the voltage source is available, and releases the stored electrical energy to carry out a brake operation when the voltage source is unavailable. The driver electrically couples with the first and second connection terminals of the coil module to control a direction of an inductor current passing through the coil module. The buffer circuit electrically couples with the coil module. In the brake operation, the buffer circuit operates to form a transient potential between the first and second connection terminals of the coil module and to consume electrical energy of the inductor current, for gradually stopping the motor in a buffering time period.
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: October 30, 2012
    Assignee: Sunonwealth Electric Machine Industry Co., Ltd.
    Inventors: Alex Horng, Tung-An Chen, Cheng-Nan Tsai, Kun-Tien Wu, Kuan-Yin Hou
  • Patent number: 8237384
    Abstract: Methods of dynamic braking include two embodiments with braking circuits for vehicles such as, for example, locomotives which are operable down to very low speeds. These circuits can provide a braking force even at zero locomotive speed.
    Type: Grant
    Filed: April 19, 2007
    Date of Patent: August 7, 2012
    Assignee: Railpower, LLC
    Inventors: Andrew C. Tarnow, Frank Wegner Donnelly, Ronald B. Bailey, Kris Redinger
  • Patent number: 8222846
    Abstract: A power transistor is arranged between an output terminal and a power supply terminal. A pre-driver includes a high-side transistor and a low-side transistor connected in series between the power supply terminal and a second terminal, and the ON/OFF operations of which are controlled in a complementary manner according to a control signal. The electric potential at a connection node between the two transistors is output to a control terminal of the power transistor. A constant voltage circuit stabilizes the second terminal to a predetermined voltage. An output transistor for the constant voltage circuit is provided between the second terminal and the ground terminal. A differential amplifier adjusts the voltage applied to the control terminal of the output transistor such that the electric potential at the second terminal approaches a predetermined target value. A feedback capacitor is provided between the second terminal and the control terminal of the output transistor.
    Type: Grant
    Filed: January 26, 2010
    Date of Patent: July 17, 2012
    Assignee: Rohm Co., Ltd.
    Inventor: Hisashi Sugie
  • Patent number: 8174226
    Abstract: A control method of a current limit of a DC motor includes generating a reference voltage according to a preset current limit value of a DC motor; comparing the reference voltage with the voltage drop of a power control switch which drives the DC motor to generate a compare result; and controlling the power delivered to the DC motor according to the compare result in order to limit the current of the DC motor.
    Type: Grant
    Filed: July 30, 2009
    Date of Patent: May 8, 2012
    Assignee: Anpec Electronics Corporation
    Inventors: Ming-Jung Tsai, Ching-Sheng Li, Kun-Min Chen
  • Publication number: 20120091933
    Abstract: A control apparatus is for use in a power conversion system including a DC/AC converter circuit connected to an electric rotating machine at output terminals thereof and to a DC power source at input terminals thereof through a switching means, a capacitor being connected across the input terminals of the DC/AC converter circuit. The control apparatus includes a current supply means configured to perform current supply control to supply a current to the electric rotating machine in order to discharge the capacitor by manipulating the DC/AC converter circuit in a state where the switching means is set open, and a speed lowering means configured to apply a brake force to a rotating shaft of the electric rotating machine to reduce a rotational speed of the electric rotating machine prior to the current supply control being performed by the current supply means if the rotational speed exceeds a specified speed.
    Type: Application
    Filed: October 13, 2011
    Publication date: April 19, 2012
    Applicant: DENSO CORPORATION
    Inventors: Hiroshi INAMURA, Hiroya Tsuji
  • Patent number: 8154232
    Abstract: In order to enable in a motor system, in which a soft start of the motor has been implemented, the operation of the motor, wherein the power consumption is reduced, it is proposed to operate the driver circuit during a switch-on phase in order to carry out a soft start of the motor. In at least one embodiment, the driver circuit can be bypassed in a normal operational phase as a function of a load, by means of which the motor is operated.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: April 10, 2012
    Assignee: Siemens Aktiengesellschaft
    Inventors: Norbert Reichenbach, Johann Seitz
  • Publication number: 20120056566
    Abstract: An electric switch, in particular for an electric tool with an electric motor. The switch has first electrical terminals for electrical connection to a voltage supply and second electrical terminals for electrical connection to the electric motor. The switch has an actuating mechanism which can be adjusted between an initial position and a final position, wherein the electric motor is switched off when the actuating mechanism is located in the initial position and is switched on when the actuating mechanism is not located in the initial position. The switch also has a braking circuit for braking the electric motor, the braking circuit operating when the actuating mechanism is reset to the initial position. The switch also has a reversal circuit for switching over the direction of rotation of the electric motor. The braking circuit is arranged between the second electrical terminals and the reversal circuit.
    Type: Application
    Filed: August 30, 2011
    Publication date: March 8, 2012
    Applicant: Marquardt GmbH
    Inventors: Christof LEXER, Jens Muller, Andreas Seidel, Norbert Papok, Michael Trondle
  • Publication number: 20120019177
    Abstract: The invention relates to a method for decelerating a drive movement of a power tool and to a power tool suitable for carrying out the method, having a drive driven by a motor, an energy supply device for the provision of electrical energy, a controller having a motor controller for activating the motor and an operating-state recognition module which is to detect at least one operating-state variable and, as a function of this, to output a brake signal, the controller being designed to initiate, as a function of the brake signal, a braking procedure in which brake cycles are provided which have a first time segment, in which the motor is short-circuited, and a second time segment in which current is fed to the motor opposite to its original direction of rotation.
    Type: Application
    Filed: July 20, 2011
    Publication date: January 26, 2012
    Inventors: Michael Kaufmann, Ulf Rinckleb
  • Patent number: 8102131
    Abstract: The invention relates to a yarn-tensioning device for producing a specific thread pull on a thread (5) that is unwound from a winding point (7) of a creel (2) and is guided to a warping machine arrangement (1). Said yarn-tensioning device comprises a rotating body (18) which is at least partially wound round by threads and an electric motor (19) which is connected to the rotation body. Said motor (19) is equipped with at least one brake transistor (20) for discharging excess energy produced when the generator of the motor is operated, said brake transistor being able to convert generator energy, arising when the generator is operated, into heat.
    Type: Grant
    Filed: May 3, 2007
    Date of Patent: January 24, 2012
    Assignee: Benninger AG
    Inventors: Alfred Jakob, Andreas Kleiner
  • Publication number: 20120013278
    Abstract: Systems and methods are provided for regenerative motor braking. The regenerative braking systems and methods allow the braking torque of a multi-phase motor to be controlled while keeping currents to acceptable levels and without supplying electrical energy back to the voltage source. The regenerative braking systems and methods dissipate energy in the motor windings instead of sending this energy to the voltage source by intelligently switching the low-side switches in the inverter between the ON and OFF states at the commutation frequency while maintaining the high-side switches in the inverter in the OFF state.
    Type: Application
    Filed: July 13, 2010
    Publication date: January 19, 2012
    Applicant: HONEYWELL INTERNATIONAL INC.
    Inventors: Casey Hanlon, Steve Abel
  • Patent number: 8076878
    Abstract: The invention relates to a traction drive for the driving and generative braking of a rail vehicle or a combination of rail vehicles, at least one permanent-field synchronous motor and a traction current converter being associated with at least one axle of the rail vehicle or combination of rail vehicles. The traction current converter includes at least one pulse current converter on the engine side, and the clamps of the permanent-field synchronous motor are connected to a change-over switch such that the permanent-field synchronous motor can be connected to a load circuit forming a load, to drive the pulse current converter or for generative braking. According to the invention, the load circuit connected to the permanent-field synchronous motor for generative braking is designed and/or controlled in such a way that the characteristic values of the load circuit can be modified according to the loading of the rail vehicle or combination of rail vehicles.
    Type: Grant
    Filed: October 25, 2007
    Date of Patent: December 13, 2011
    Assignee: Knorr-Bremse Systeme fur Schienenfahrzeuge GmbH
    Inventors: Falk Hähle, Ulf Friesen, Josef Schmucker