Braking Patents (Class 318/757)
  • Patent number: 11070160
    Abstract: An electric power tool includes: a brushless motor having a plurality of stator windings and configured to rotate in accordance with voltages applied to the plurality of stator windings, an induced voltage being generated in accordance with a rotation of the brushless motor; a rectifier circuit configured to rectify an AC voltage; a smoothing capacitor configured to smooth the AC voltage rectified by the rectifier circuit to a pulsation voltage having a maximum value larger than the induced voltage and a minimum value smaller than the induced voltage; and an inverter circuit configured to perform switching operations to output the pulsation voltage to the plurality of stator windings by rotation.
    Type: Grant
    Filed: July 20, 2018
    Date of Patent: July 20, 2021
    Assignee: Koki Holdings Co., Lid.
    Inventors: Kazutaka Iwata, Toshiaki Koizumi
  • Patent number: 11046559
    Abstract: A lifting device includes a motor designed as a three-phase asynchronous motor via which the lifting device can be driven to lift and lower a load, and includes a brake resistor via which a power output resulting from a motor generator operation that is carried out when lowering the load at a lowering speed can be converted into heat. The brake resistor is designed for a rated power which is less than the power resulting with a nominal load and a nominal speed. A method for operating a lifting device includes lowering a load at a lowering speed while taking into consideration at least one load capacity characteristic value of the brake resistor for the lowering speed, a threshold is set such that while lowering the load at the lowering speed corresponding to the threshold, the resulting power output is limited to the at least one load capacity characteristic value.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: June 29, 2021
    Assignee: Konecranes Global Corporation
    Inventors: Gabriel Krause, Daniel Kleinwächter, Ralf Pamotat, Torsten Reetz
  • Patent number: 10840807
    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: September 22, 2017
    Date of Patent: November 17, 2020
    Assignee: Thermo King Corporation
    Inventors: Ryan Wayne Schumacher, Johannes Hendricus Vissers, Cas Bakker
  • Patent number: 10787065
    Abstract: A vehicular opening/closing body control device includes a braking control unit configured to apply a braking force to an opening/closing body by supplying driving power having a locked conduction phase to a motor, which is a drive source of the opening/closing body, wherein, when an execution time of phase-locked conduction control for locking the conduction phase and supplying the driving power reaches or exceeds a predetermined time, the braking control unit switches a conduction phase used for the phase-locked conduction control.
    Type: Grant
    Filed: March 20, 2018
    Date of Patent: September 29, 2020
    Assignee: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Tomoyuki Takenaka, Kohei Kobayashi
  • Patent number: 10700629
    Abstract: Systems and methods are disclosed for determining an operating point for controlling an electric motor. An exemplary system may include a voltage monitor configured to determine a voltage applied to the electric motor. The system may also include a controller configured to determine the operating point based on the voltage. The controller may include a comparator configured to determine a difference between the voltage and a reference voltage. The controller may also include a regulator configured to generate a correction signal for reducing the difference. The controller may be configured to determine the operating point when the difference is below a predetermined threshold.
    Type: Grant
    Filed: May 2, 2016
    Date of Patent: June 30, 2020
    Assignee: FARADAY&FUTURE INC.
    Inventors: Mengwei Campbell, Stefan Grubic
  • Patent number: 10246809
    Abstract: A washing machine includes an alternating current (AC) motor which generates torque, a clutch assembly which selectively transfers the torque to a rotating tub and a pulsator, a speed detector which detects a rotary speed of the clutch assembly, and a controller configured to repetitively perform operating and stopping the operating of the AC motor based on a predetermined target speed and the rotary speed of the clutch assembly in a spin-drying operation. The controller gradually increases the torque of the AC motor while operating the AC motor.
    Type: Grant
    Filed: January 29, 2016
    Date of Patent: April 2, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hyun Oh Kim, Jun Hyun Park, Sung Mo Lee
  • Patent number: 9780699
    Abstract: The present disclosure relates to a motor protection relay and a method for starting a motor of the motor protection relay, and particularly, to a motor protection relay capable of softly starting a motor, without a separate starting device, and performing soft starting of the motor more stably, effectively, and simply, by variably controlling start power for starting the motor to the motor through controlling of the relay itself and supplying the variably controlled start power to the motor, and a method for starting a motor thereof.
    Type: Grant
    Filed: December 31, 2015
    Date of Patent: October 3, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Kyungho Kim
  • Patent number: 9407234
    Abstract: The present invention discloses a current balancing device and method capable of balancing an output current and an input current of a current loop. Said device comprises: a transmission circuit for outputting an output current and receiving an input current; at least one adjustable resistor set in the current loop for providing resistance according to at least one adjustment signal; and a current balancing circuit, coupled to the transmission circuit and the adjustable resistor, for determining whether the difference between the output and input currents satisfies a predetermined requirement in light of a predetermined duration and thereby generating the adjustment signal, wherein if the difference between the output and input currents fails to satisfy the predetermined requirement, the current balancing circuit will adjust the resistance of the adjustable resistor through the adjustment signal, so as to reduce the difference between the output and input currents.
    Type: Grant
    Filed: October 15, 2014
    Date of Patent: August 2, 2016
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventors: Shih-Wei Wang, Su-Liang Liao, Liang-Wei Huang, Sheng-Fu Chuang
  • Patent number: 9300240
    Abstract: A method of obtaining a maximum magnetic flux of a permanent magnet synchronous motor may comprise: receiving a first command voltage from a current controller to control current applied to the permanent magnet synchronous motor; receiving an on/off duty ratio of a control pulse signal to control an output voltage of an inverter that drives the permanent magnet synchronous motor, the on/off duty ratio being determined based on the first command voltage; generating a second command voltage corresponding to the output voltage to be output from the inverter based on the on/off duty ratio of the control pulse signal; obtaining a maximum command voltage error by comparing the first and second command voltages; and/or obtaining the maximum command magnetic flux of the permanent magnet synchronous motor according to a position of a rotor of the permanent magnet synchronous motor based on the maximum command voltage error.
    Type: Grant
    Filed: April 22, 2013
    Date of Patent: March 29, 2016
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hyun-bae Kim, Jong-soo Kim, Jei-hoon Baek, Kyu-bum Han
  • Patent number: 9287807
    Abstract: Disclosed herein is an apparatus of a sensorless brush less direct current (BLDC) motor capable of rapidly driving the BLDC motor at a decreased speed.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: March 15, 2016
    Inventor: Sang-Hyun Lee
  • Publication number: 20140346998
    Abstract: The invention relates to an asynchronous motor unit including a frequency converter for regulating the asynchronous motor. The frequency converter comprises an input-side, uncontrolled bridge rectifier, a DC voltage intermediate circuit and an output-side inverter. According to the invention, the DC voltage intermediate circuit furthermore comprises a DC-to-DC converter with galvanic isolation, with the result that electrical isolation between the bridge rectifier and the inverter is produced.
    Type: Application
    Filed: December 7, 2012
    Publication date: November 27, 2014
    Inventors: Ralf Kleinodt, Uwe Gehlert
  • Patent number: 8886433
    Abstract: An electric braking control apparatus for controlling an electric braking apparatus which includes a brake pad, a motor which generates a rotational torque, and a rotation/linear motion conversion mechanism which causes the brake pad to generate a pressing force based on the torque. The braking control apparatus includes an inverter which converts and outputs an electric current supplied from a power supply to the motor, and a microcomputer that receives power from the power supply, detects the value of a voltage applied from the power supply to the inverter, and controls the electric current output from the inverter depending on a result of the detection.
    Type: Grant
    Filed: October 22, 2007
    Date of Patent: November 11, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Yasufumi Konishi, Toshiyuki Innami, Satoru Kuragaki, Takafumi Suzuki
  • Patent number: 8736204
    Abstract: Apparatus for transferring power between an electricity network (UP) operating on alternating-current electricity and a multiphase electric machine (M2, M3), which apparatus comprises low-voltage power cells (CS, C11 . . . CN6) operating on a cascade principle, which power cells comprise a single-phase output connector (OUT), and at least one transformer (TA, T1 . . . TN), comprising for each power cell connected to it a single-phase or multiphase winding dedicated to the specific power cell, which transformer comprises at least one additional winding (WA, WB1 . . . WBN) connected to the same magnetic circuit as the other windings for the purpose of at least one auxiliary circuit, which can be connected to the aforementioned additional winding.
    Type: Grant
    Filed: January 3, 2012
    Date of Patent: May 27, 2014
    Assignee: Vacon Oyj
    Inventors: Nicklas Södö, Risto Komulainen
  • Patent number: 8686670
    Abstract: A system and method for determining the holding torque of a brake in a material handling system is disclosed. The material handling system may include a bridge, a trolley, and a hoist, each driven along a different axis by a motor. A brake is operatively coupled to the motor to prevent unwanted motion of the motor. A motor controller is coupled to each motor which controls operation of the motor and its corresponding brake. The motor controller generates a torque command to the motor while keeping the brake set. The initial torque command is less than the holding torque of the brake. The torque command is incremented until motion is detected on the motor. The torque value when motion is detected is stored in the motor controller and displayed to an operator.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: April 1, 2014
    Assignee: Magnetek, Inc.
    Inventors: Kurtis L. Verheyen, Aaron Kureck
  • Patent number: 8487563
    Abstract: A drive motor control apparatus for a vehicle, wherein the vehicle has a motor and rotation detecting unit. In the apparatus, the first difference computing unit computes one of multiple first differences every time an actual detected angle of rotation of the motor becomes a corresponding representative angle during the one cycle. The first difference indicates an advancing amount of an estimated angle relative to the actual detected angle. The second difference computing unit computes multiple second differences based on the first differences of the one cycle. The second differences are adjusted in accordance with a degree of acceleration and deceleration of the motor. The adjusted second differences are used for correcting the actual detected angle of rotation of the motor.
    Type: Grant
    Filed: November 24, 2010
    Date of Patent: July 16, 2013
    Assignee: Denso Corporation
    Inventors: Eiichiro Kawakami, Shigenori Mori, Jyunji Miyachi
  • Patent number: 8390229
    Abstract: A method of braking a washing machine from an operational speed to a reduced non-zero speed is provided (as well as a washing machine incorporating the method) for a washing machine driven by one of a synchronous or asynchronous motor. Upon receipt of a speed reduction signal, the motor rotating magnetic fields are collapsed for a defined time period. After the defined time period, DC braking voltage is applied to the motor stator windings at a controlled ramp-up rate to an amplitude to generate a controlled ramped braking torque on the motor until the motor has slowed to a defined reduced speed. Thereafter, the amplitude of the DC braking voltage is set to 0V and the motor is soft started to an amplitude and reduced frequency needed to maintain the defined reduced speed.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: March 5, 2013
    Assignee: General Electric Company
    Inventor: Richard Dean Suel, II
  • Patent number: 8207700
    Abstract: The invention relates to a switch arrangement of an electric motor drive (1). The electric motor drive comprises safety switches (3) determined by the safety of the drive, a controlled mechanical brake (4), a power supply circuit (5) of the brake control, a power converter (6), which power converter comprises a network rectifier (7) and a power rectifier (8) of the motor. The power rectifier of the motor is at least partly implemented with controlled semiconductor switches (9, 10) arranged into a bridge. The power converter comprises an intermediate circuit (11, 12) between the network rectifier and the power rectifier of the motor. The switch arrangement comprises normally-open switches (13, 14) in the intermediate circuit of the power converter (6).
    Type: Grant
    Filed: January 25, 2010
    Date of Patent: June 26, 2012
    Assignee: Kone Corporation
    Inventors: Timo Syrman, Ari Kattainen
  • Patent number: 8198837
    Abstract: A DC motor control device calculates motor speed using determinations of motor field flux and armature voltage in the motor. The device includes a control module having one or more control inputs and one or more control outputs. At least one control input is configured to receive data representing field current measured in the DC motor. The control module includes flux curve logic that is responsive to measurements of motor field current to calculate a field flux in the motor. The flux curve logic uses a flux curve stored in the control module, the flux curve representing a functional relationship between field current and field flux in the motor. The flux curve is defined by a plurality of flux curve data points corresponding to a plurality of motor field currents within a lower current range and within an upper current range. The flux curve is further defined by at least a first flux curve line positioned within the lower current range and a second flux curve line positioned within the upper current range.
    Type: Grant
    Filed: November 23, 2009
    Date of Patent: June 12, 2012
    Assignee: Magnetek, Inc.
    Inventor: Jason Wellnitz
  • Patent number: 8076876
    Abstract: A servomotor system is provided. The servomotor system includes an enclosure and a motor stator and rotor disposed in the enclosure. The servomotor system also includes a motor brake disposed in the enclosure and configured to selectively brake the rotor from rotation and a brake control switch disposed in the enclosure and coupled to the motor brake for selectively providing power to the motor brake for selectively engaging and/or disengaging the brake.
    Type: Grant
    Filed: January 8, 2010
    Date of Patent: December 13, 2011
    Assignee: Rockwell Automation Technologies, Inc.
    Inventor: Thomas D. Lundell
  • Patent number: 8035332
    Abstract: A method of operating a motor, the method comprising: operating a motor at a first speed; operating the motor in negative slip; imbalancing at least one phase of the motor to dissipate regeneration energy using windings of the motor; and wherein a next motor speed is decreased to a speed less than the first speed. An apparatus for carrying out the method is also presented.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: October 11, 2011
    Assignee: General Electric Company
    Inventors: Mariano Filippa, Edward Hatfield, Richard D. Suel, II, John Steven Holmes
  • Patent number: 7902790
    Abstract: A slip frequency is estimated from a current instruction or detected currents in an induction motor. Acceleration impossibility in an induction motor drive unit is determined, when the slip frequency exceeds the maximum torque generating slip frequency for the predetermined interval or the time integrating result exceeds a predetermined value; when the q-axis magnetic flux exceeds the maximum torque generating q-axis magnetic flux or exceeds for a predetermined interval; when the estimated rotational speed is under a predetermined value; when the rotational speed variation rate is negative; and when the rotational speed instruction value or the estimated rotational speed is equal to or smaller than a predetermined value. An induction motor drive system and an elevating system including the induction motor drive unit are also disclosed.
    Type: Grant
    Filed: June 19, 2008
    Date of Patent: March 8, 2011
    Assignee: Hitachi Industrial Equipment Systems Co., Ltd.
    Inventors: Yoichiro Arakawa, Koichiro Nagata, Hiroyuki Tomita
  • Patent number: 7898196
    Abstract: A motor driving apparatus for driving and braking a motor equipped with a brake comprises a motor/brake driving DC power supply which is used both as a motor driving power supply and as a brake driving power supply, wherein when the motor/brake driving DC power supply is being used as the motor driving power supply, a voltage conversion circuit via which a voltage supplied from the motor/brake driving DC power supply is applied to the brake feedback-controls the voltage applied to the brake. This configuration serves to reduce the loss (due to temperature rise) in the brake coil of the motor being driven to move a robot arm.
    Type: Grant
    Filed: October 14, 2007
    Date of Patent: March 1, 2011
    Assignee: Fanuc Ltd
    Inventors: Shinichi Horikoshi, Naoyuki Suzuki, Tsutomu Shikagawa
  • Patent number: 7898208
    Abstract: A boost converter boosts a DC voltage of a DC power supply. An inverter converts the output voltage of the boost converter into an AC voltage. A control device that controls the boost converter reduces an output voltage instruction value of the boost converter when the rotation speed of the AC motor decreases and an absolute value of a variation rate of the rotation speed is not less than a predetermined value. The inverter is controlled in the control mode selected from a plurality of control modes including three modes of a sine wave PWM control mode, an overmodulation PWM control mode and a rectangular wave control mode. The control device of the boost converter reduces the output voltage instruction value of the boost converter only when the control mode of the inverter is the rectangular wave control mode or the overmodulation control mode.
    Type: Grant
    Filed: November 1, 2006
    Date of Patent: March 1, 2011
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kiyoe Ochiai, Masaki Okamura, Hiroyuki Oyanagi
  • Patent number: 7528583
    Abstract: In the m phase brushless generator, n (n<m) phase magnet coil groups are provided with magnetic sensors, while the remaining (m?n) phase magnet coil groups are not provided with magnetic sensors. The regeneration control circuit utilizes the sensor outputs of the n magnetic sensors to generates n sets of regeneration control signals for the n phase magnet coil groups. The regeneration control circuit further generates (m?n) sets of regeneration control signals for the (m?n) phase magnet coil groups not associated with the n magnetic sensors, using one or more of the sensor outputs of the n magnetic sensors in generation of each of the (m?n) sets of regeneration control signals.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: May 5, 2009
    Assignee: Seiko Epson Corporation
    Inventor: Kesatoshi Takeuchi
  • Patent number: 7511438
    Abstract: A system and method are provided whereby at least two motors driven by an inverter coupled to a DC bus are configured to alternate between regenerative and injection braking such that at least one motor is placed in regenerative braking mode and at least one motor is placed in motoring mode. Energy is simultaneously placed on and removed from the DC bus in a manner allowing a large current to flow in as many motors as possible, for fast stoppage of load inertia. At least one motor may be placed in regenerative braking mode and at least one motor in DC injection mode, such that energy is simultaneously placed onto and removed from the DC bus, respectively. Further, a single motor may be is alternated between regenerative braking and DC injection braking, such that energy is alternately placed onto and removed from the DC bus, respectively.
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: March 31, 2009
    Assignee: Reliance Electric Technologies, LLC
    Inventor: Michael J. Melfi
  • Publication number: 20080315824
    Abstract: A slip frequency is estimated from a current instruction or detected currents in an induction motor. Acceleration impossibility in an induction motor drive unit is determined, when the slip frequency exceeds the maximum torque generating slip frequency for the predetermined interval or the time integrating result exceeds a predetermined value; when the q-axis magnetic flux exceeds the maximum torque generating q-axis magnetic flux or exceeds for a predetermined interval; when the estimated rotational speed is under a predetermined value; when the rotational speed variation rate is negative; and when the rotational speed instruction value or the estimated rotational speed is equal to or smaller than a predetermined value. An induction motor drive system and an elevating system including the induction motor drive unit are also disclosed.
    Type: Application
    Filed: June 19, 2008
    Publication date: December 25, 2008
    Inventors: Yoichiro ARAKAWA, Koichiro NAGATA, Hiroyuki TOMITA
  • Publication number: 20080297098
    Abstract: A washing machine is provided that includes an induction motor and a motor control circuit with a feedback loop. The feedback loop provides rotor speed to a microprocessor of the motor control circuit. The motor control circuit and feedback loop control the motor such that the motor operates in a negative slip mode which provides braking to the washing machine.
    Type: Application
    Filed: June 1, 2007
    Publication date: December 4, 2008
    Inventors: Robert Keith Hollenbeck, Justin Brubaker, James Robert Crowell, Bruce Calvin Ley
  • Patent number: 7453220
    Abstract: A drive, including at least a brake and an electromotor, is connected to an output stage with the aid of supply lines, the brake being supplied from a brake control, the brake control being connected to the supply lines for its supply, via capacitors.
    Type: Grant
    Filed: January 26, 2005
    Date of Patent: November 18, 2008
    Assignee: Sew-Eurodrive GmbH & Co. KG
    Inventors: Günter Becker, Josef Schmidt
  • Patent number: 7327110
    Abstract: A drive system with an electric motor is described, which includes an integrated armature short-circuit brake and a mechanical brake. If the electric motor cannot be controllably slowed down, a control signal is applied at an activation time to the integrated armature short-circuit brake and the mechanical brake, and the armature short-circuit brake is switched off when reaching a thermal load limit for the electric motor or the control electronics.
    Type: Grant
    Filed: November 21, 2003
    Date of Patent: February 5, 2008
    Assignee: Siemens Aktiengesellschaft
    Inventor: Ronald Hauf
  • Patent number: 7268514
    Abstract: A method and apparatus for stopping an AC motor that is controlling a load while detecting mechanical brake slippage of a mechanical brake for holding the load against movement includes a controller for decreasing torque-producing current commands from the drive while a speed regulator is commanding zero speed, sensing movement of the load while the speed regulator is commanding zero speed, detecting movement of the load past a pre-determined distance limit, and increasing torque to support the load and prevent further movement of the load. The controller will again decrease torque-producing current commands from the drive, and again checking for movement of the load, and upon sensing no load movement upon reaching zero torque, then shutting off the motor.
    Type: Grant
    Filed: November 30, 2004
    Date of Patent: September 11, 2007
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Robert J. DeLange, Timothy M. Rowan, Roman W. Lichon, Glenn E. Frazier, Lynn J. Cooksey
  • 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: 7170245
    Abstract: A motor power supply including a DC supply part having a pair of supply terminals; an inverter having a pair of connection terminals respectively connected to the supply terminals thereof to receive DC power therefrom and to supply AC power to a motor, a breaking resistor and a control switching element disposed in parallel in an additional line connecting the pair of connection terminals to each other, a control switching element disposed with the breaking resistor in the additional line, a breaking switch disposed to one of the connection terminals and switched to either a normal position or a breaking position connecting the one connection terminal to a corresponding supply part or to the additional line, a speed detector detecting a motor speed and a control part controlling the breaking switch to switch to the breaking position and controlling the control switching element so that an on-off interval of the control switching element is controllable depending on the detected speed.
    Type: Grant
    Filed: December 31, 2003
    Date of Patent: January 30, 2007
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jang-hyoun Youm
  • Patent number: 7023168
    Abstract: A control system for an electric machine includes a flux weakening module, which includes a voltage magnitude calculator that receives d-axis and q-axis command voltages and that generates a voltage magnitude. An error circuit compares the voltage magnitude to a reference voltage and generates an error signal. A controller receives the error signal and generates a feedback flux correction signal. A limiter limits the feedback flux correction signal to a predetermined flux value and generates a limited feedback flux correction signal. A feedforward stator flux generating circuit generates a feedforward stator flux signal. A summing circuit sums the feedforward stator flux signal and the limited feedback flux correction signal to generate a final stator flux command.
    Type: Grant
    Filed: September 13, 2004
    Date of Patent: April 4, 2006
    Assignee: General Motors Corporation
    Inventors: Nitinkumar R. Patel, Steven E. Schulz, Seung Ki Sul, Bon-Ho Bae
  • 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: 6879123
    Abstract: A device to control a 3-phase motor having an inverter connected to each phase terminal and a brake to arrest the 3-phase motor, includes a power supply to supply power to the brake and the inverter at the same time based on a predetermined synchronization signal. The device also includes a control unit to output an inverter control signal to control the inverter and a power control signal to enable the power supply to supply the power to the brake and the inverter. Thus, the device to control a 3-phase motor has an immediate response to a control signal with a reduced production cost and a system size, by reducing circuit components such as a brake relay and a brake power supply.
    Type: Grant
    Filed: January 7, 2004
    Date of Patent: April 12, 2005
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jang-hyoun Youm
  • Patent number: 6876171
    Abstract: A driving apparatus of a three-phase induction motor includes: a three-phase power supply unit for supplying three-phase power; a rectifier for rectifying the three phase voltage supplied from the three phase power supply unit; a voltage reducing unit for reducing a DC voltage generated from the rectifier and outputting a stabilized DC voltage; and an inverter unit for varying the DC voltage outputted from the voltage reducing unit to a three-phase AC voltage and driving a three-phase induction motor. A power-factor degradation generated during supplying a DC voltage to the inverter to drive the three-phase induction motor is prevented, a harmonic wave is removed, and because a high-priced inverter component is not necessary, its relevant expense is reduced.
    Type: Grant
    Filed: April 16, 2003
    Date of Patent: April 5, 2005
    Assignee: LG Electronics
    Inventor: Jae-Choon Lee
  • Patent number: 6870344
    Abstract: An inverter part having a switching unit for applying a three-phase AC voltage to a motor, a lock detection unit for detecting a lock state of the motor and also generating a lock detection signal by the detection, and a current control unit for passing a d-shaft armature current id through the motor so that an absolute value of a current of a phase with the largest current flowing through the motor decreases based on the lock detection signal.
    Type: Grant
    Filed: October 3, 2001
    Date of Patent: March 22, 2005
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Shigeo Jinbo
  • Patent number: 6741062
    Abstract: A circuit configuration supplies an electric motor with a stator and a rotor. The stator has a large number of electromagnets, arranged in particular in the form of a ring, and the rotor has a large number of permanent magnets that are associated with the electromagnets on the stator and are arranged, in particular, in the form of a ring. A rectifier circuit converts the a.c. voltage which is drawn from the supply network to a d.c. voltage. A converter circuit converts the d.c. voltage to a controllable frequency a.c. voltage for supplying the electric motor with electrical drive energy. An energy storage circuit which contains at least one accumulator is connected between the rectifier circuit and the converter circuit.
    Type: Grant
    Filed: February 19, 2003
    Date of Patent: May 25, 2004
    Assignee: Innova Patent GmbH
    Inventor: Elmar Fuchs
  • Patent number: 6741050
    Abstract: A control method and a switching circuit for braking an electronically commutated electrical motor, wherein operation is in a phase period (T) of an inverter relative to at lest one winding, sequentially, both in a motoring mode and a generating operating mode using various cycles (t1-t2, t3-t4) beginning with zero, such that the driving and braking torques associated with the cycles (t1-t2, t3-t4) produce a resultant braking moment averaged over the phase period (T).
    Type: Grant
    Filed: July 16, 2002
    Date of Patent: May 25, 2004
    Assignee: Hilti Aktiengesellschaft
    Inventors: Walter Wissmach, Rudolf Bauer, Vilmos Török
  • Patent number: 6710573
    Abstract: PWM AC power is supplied to an induction motor or other AC load. The frequency and magnitude of the waveforms is controlled by detecting the peak voltage or width of the reverse EMF pulses at the commencement of the power waveform applied to the load, and then adjusting the applied AC power based on the detected peak voltage or width. Alternatively, the depth of width of a notch that follows the reverse EMF pulse can be detected and used to control the applied AC power.
    Type: Grant
    Filed: March 6, 2002
    Date of Patent: March 23, 2004
    Inventor: Andrew S. Kadah
  • Patent number: 6700347
    Abstract: This invention is to provide a variable speed apparatus capable of equalizing a moving distance at the time of deceleration from deceleration start to deceleration completion in the case that a deceleration stop command is inputted during acceleration to a moving distance at the time of deceleration from deceleration start to deceleration completion in the case that a deceleration stop command is inputted during operation at an adjustable speed reference frequency even when the deceleration stop command is inputted during acceleration.
    Type: Grant
    Filed: August 12, 2002
    Date of Patent: March 2, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hisao Sakurai, Yasuhiro Shiraishi
  • Patent number: 6667596
    Abstract: In order to control the run-down of an induction machine, whose stator is connected to a singe-phase or polyphase AC main power supply system via an AC power controller which can be controlled by phase gating, a phase gating angle is first increased in steps until an operating point is reached, which is defined on the basis of predetermined criteria. The phase gating angle is then controlled in order to ensure that the induction machine runs down in accordance with a predetermined control program.
    Type: Grant
    Filed: June 14, 2001
    Date of Patent: December 23, 2003
    Assignee: Siemens AG
    Inventors: Gerd Griepentrog, Diethard Runggaldier
  • Patent number: 6650245
    Abstract: A multi-functional hybrid contactor has a motor protection function against an abnormal state in addition to the starting, running and stopping of the motor, the same effect as the case that an electronic motor protection relay (EMPR) is connected in parallel can be obtained with only one multi-functional hybrid contactor. Also, the size of the product is much reduced compared to the case that the electric motor protection relay (EMPR) is connected in parallel, and its cost can be reduced. In addition, since the semiconductor switch is turned on only in the initial stage of starting and stopping, the rated current capacity and size of the semiconductor switch can be considerably reduced compared to the conventional soft starting method in which the semiconductor switch is used for controlling of all of starting, running and stopping.
    Type: Grant
    Filed: January 16, 2002
    Date of Patent: November 18, 2003
    Assignee: LG Industrial Systems Co., Ltd.
    Inventor: Yong Ho Chung
  • Patent number: 6646411
    Abstract: A control device for a compressor motor and an inverter according to the present invention monitors the amplitude of a phase current of a three-phase DC motor. As the amplitude of the phase current approaches an overload condition of the inverter or motor, the control device decreases the rotational velocity of the motor by a predetermined rotational deceleration. By reducing the rotational velocity of the motor by a certain deceleration, the control device of the present invention ensures that the motor load, i.e., the amplitude of the phase current, does not reach or exceed an overload condition. By use of this device, it is possible to suppress or reduce effectively the frequency of motor stops caused by an increase in the phase current.
    Type: Grant
    Filed: December 12, 2001
    Date of Patent: November 11, 2003
    Assignee: Sanden Corporation
    Inventors: Daisuke Hirono, Ichirou Kuwabara, Yuuji Yoshii
  • Patent number: 6236177
    Abstract: A power tool including a braking and control circuit. The braking and control circuit includes a microcontroller-based control means circuit. The microcontroller assures control of switch means, such as triacs, switches and relays, and ensures that braking is effectuated regardless of the phase in the power cycle of the alternating current. Also, the microcontroller is programmable so that the braking and control circuit accommodates different braking conditions for different power tools and accommodates combinations of braking conditions for the same power tool. Further, the microcontroller is programmable to configure the braking and control circuit so that the braking force applied to the motor and the stopping time of the motor are regulated and adjustable. This may be accomplished by outputting a control signal so that the switch means skips cycles in the alternating current or by otherwise adjusting the operation of the switch means.
    Type: Grant
    Filed: June 4, 1999
    Date of Patent: May 22, 2001
    Assignee: Milwaukee Electric Tool Corporation
    Inventors: Jonathan A. Zick, Joseph W. Willhide
  • Patent number: 6208113
    Abstract: The present invention relates to a system for controlling the rotation speed of AC motors, in particular single phase motors. In this case, a controllable electronic switching device is connected upstream of the motor and is actuated by a control unit such that a sinusoidal input AC voltage is used to produce a motor AC voltage which can be varied in order to change the rotation speed. The control unit is designed in such a manner that the fundamental frequency and/or the amplitude of the motor AC voltage can be varied by phase gating.
    Type: Grant
    Filed: September 21, 1999
    Date of Patent: March 27, 2001
    Assignee: ebm Werke GmbH & Co.
    Inventors: András Lelkes, Jens Krotsch
  • Patent number: 6177772
    Abstract: A circuit and method for braking a disk drive when a power fault occurs has a circuit (10) for producing an output signal (28) indicating that the motor of the disk drive has slowed at least to a predetermined rotational speed after the occurrence of the power fault. The components of the circuit (10) may be integrated onto the same integrated circuit as the motor driving circuitry or head retract circuitry. During the time between the occurrence of the power fault and the time the disk drive has slowed to the predetermined rotational speed, the read/write head mechanism (17) is retracted. A braking circuit then brakes the disk drive when the output signal (28) indicates that the motor has slowed, at least to the predetermined rotational speed. The circuit for producing an output signal indicating that the motor has slowed at least to the predetermined rotational speed is actuated by the back-emf (14) generated by the motor failing below a predetermined level.
    Type: Grant
    Filed: December 15, 1998
    Date of Patent: January 23, 2001
    Assignee: Texas Instruments Incorporated
    Inventors: Shaibal Barua, William R. Krenik
  • Patent number: 6147470
    Abstract: A vector control apparatus having a DC braking function which is insusceptible to trip even upon DC braking and scarcely suffers vibration upon stoppage is provided.The control apparatus includes a DC braking control arithmetic unit 1 and switches S1, S3 and S4 controlled thereby, wherein in a vector control mode, the DC braking control arithmetic unit 1 sets all the switches S1, S3 and S4 to position a for realizing the vector control. When a DC control state is to be validated from the above-mentioned state, phase of voltage vector is calculated to change over the switches S1 and S3 to position b, and the absolute value of the q-axis current is compared with a reference value .alpha.. When the absolute value of the q-axis current is smaller than the reference value .alpha., the switch S4 is changed over to the position b to thereby effectuate only the d-axis current control.According to the present invention, there is provided a vector control apparatus having a tripless DC braking function.
    Type: Grant
    Filed: March 12, 1999
    Date of Patent: November 14, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Hironori Ohashi, Makoto Takase, Hiroyuki Tomita, Seiji Ishida
  • Patent number: 6121739
    Abstract: The invention relates to a method for enhancing the dosing precision of a dosing pump which is driven by an asynchronous motor via an eccentric gear. The supply of the motor is cut off approximately half a cycle time before a desired dosing pause period or stoppage. The motor freewheels afterwards for part of the cycle time, before a direct voltage is applied to it for approximately a quarter cycle time, such that an eddy current is induced in the rotor, which produces an antipolarized magnetic field which brakes the rotor.
    Type: Grant
    Filed: June 23, 1999
    Date of Patent: September 19, 2000
    Assignee: Lang Apparatebau GmbH
    Inventor: Albert Haberlander
  • Patent number: RE39023
    Abstract: While a ring gear shaft 126 linked with a drive shaft rotates, a power output apparatus 110 applies a torque to a first motor MG1 attached to a sun gear shaft 125, thereby abruptly increasing a revolving speed of an engine 150, to which a fuel injection is stopped. A torque generated by a frictional force of, for example, a piston in the engine 150 and working as a reaction is applied as a braking torque to the ring gear shaft 126 via a planetary gear 120. The magnitude of the braking torque depends upon the frictional force of, for example, the piston and can be controlled by regulating the revolving speed of the engine 150 by means of the first motor MG1. This control procedure enables the energy consumed by the engine 150 to be output as a braking force to the drive shaft.
    Type: Grant
    Filed: June 21, 2001
    Date of Patent: March 21, 2006
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Shoichi Sasaki