Armature Or Primary Current Patents (Class 318/367)
  • Patent number: 11912161
    Abstract: The invention relates to a method for in-place diagnosis of a rechargeable electric vehicle battery, comprising the following steps: discharging the battery in a motor of the vehicle, using an internal resistance of the motor as a resistive load; measuring parameters of the battery during discharge to establish a state of health of the battery; estimating the temperature of the motor during discharge; and regulating the discharge current to stabilize the temperature of the motor at a constant admissible threshold.
    Type: Grant
    Filed: September 25, 2019
    Date of Patent: February 27, 2024
    Assignee: EBIKELABS
    Inventors: Maël Bosson, Raphaël Marguet, Theophile Alary
  • Patent number: 10756653
    Abstract: A method of controlling a brushless motor that includes sensing a temperature and using the sensed temperature to define a current limit. A lower current limit is then defined for a lower sensed temperature. A winding of the motor is sequentially energized and de-energized, with the winding being de-energized when current in the winding exceeds the defined current limit.
    Type: Grant
    Filed: July 2, 2013
    Date of Patent: August 25, 2020
    Assignee: Dyson Technology Limited
    Inventors: Stephen Greetham, David John Hawker
  • Patent number: 9725011
    Abstract: A system and a method are provided for controlling emergency driving of a fuel cell vehicle. The system includes a cutoff relay that connects or cuts off a current flow between a chopper and a supercapacitor. A connecting relay connects or cuts off a current flow between a power line to which a fuel cell and a driving motor are connected and the supercapacitor. An emergency driving relay includes a first terminal connected to a line branched from a ground line to which the fuel cell and the driving motor are connected and a second terminal connected between a braking resistor and the chopper. A power system controller is driven in an emergency driving mode to cutoff relay to be turned off and the connecting relay to be turned on during a short circuit of the chopper and turns the emergency driving relay on or off.
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: August 8, 2017
    Assignee: Hyundai Motor Company
    Inventors: Sungdo Kim, Minsu Kang, Chang Seok Ryu, Dong Hun Lee
  • Patent number: 9178457
    Abstract: The present invention provides a generator brake system for providing a brake control of a generator. The generator brake system includes a power conversion unit, a sensing unit, and a control unit. The power conversion unit receives an output voltage and an output current, generated from the generator, and the power conversion unit has at least one switch unit. The sensing unit receives the output voltage and the output current to generate a voltage signal and a current signal. The control unit receives the voltage signal and the current signal. When receiving a braking signal, the control unit generates at least one control signal for correspondingly turning on the at least one switch unit, thus braking the generator in a short circuit manner.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: November 3, 2015
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Chih-Hung Hsiao, Jo-Fang Wei
  • Patent number: 8788167
    Abstract: A clutch control unit includes a clutch motor controller that controls a clutch motor. The clutch motor controller has a target clutch motor current computing unit that computes a target clutch motor current for adjusting torque of the clutch motor to be torque corresponding to an operating state of the vehicle, and a motor driving and braking selection unit that selects a motor driving mode in which the clutch motor is driven by applying feedback control on an output of the clutch motor or a motor braking mode in which the clutch motor is braked by short-circuiting the clutch motor according to a difference between the target clutch motor current and an actually detected clutch motor current. It thus becomes possible to provide a control system of a transmission that engages a clutch by a motor braking force in a manner that suits the running state of the vehicle.
    Type: Grant
    Filed: January 21, 2009
    Date of Patent: July 22, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Osamu Ishikawa, Takeru Okabe, Nozomu Kamioka, Tomohisa Shoda, Masaki Horii, Yasufumi Ogawa, Shiro Yonezawa
  • Patent number: 8026680
    Abstract: Methods and apparatus to reduce the stopping time of a spindle motor are disclosed. An example method includes detecting a dissipation current flowing in a spinning motor; determining when the dissipation current drops below a threshold value; and, in response to the dissipation current dropping below the threshold value, applying a voltage to the motor to increase the dissipation current for a duration. In some examples, the voltage is removed from the motor when the motor reaches a predetermined rotational velocity to avoid reverse rotation.
    Type: Grant
    Filed: March 31, 2008
    Date of Patent: September 27, 2011
    Assignee: Texas Instruments Incorporated
    Inventor: Triet Tieu
  • Publication number: 20100001672
    Abstract: A vehicle generator motor has a generator motor that is connected to an internal combustion engine and plural sets of three-phase windings, plural sets of inverter portions connected to the respective sets of the three-phase windings, and a control circuit portion for controlling the inverter portions in accordance with the operation state of the generator motor. When the generator motor operates as a motor and a variation value of an output torque or power generation amount thereof exceeds a predetermined value, the control circuit portion controls the inverter portions so as to stop armature current flowing in at least one set in plural sets of three-phase windings.
    Type: Application
    Filed: December 30, 2008
    Publication date: January 7, 2010
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Naohide MAEDA, Masahiko FUJITA
  • Publication number: 20090243521
    Abstract: Methods and apparatus to reduce the stopping time of a spindle motor are disclosed. An example method includes detecting a dissipation current flowing in a spinning motor; determining when the dissipation current drops below a threshold value; and, in response to the dissipation current dropping below the threshold value, applying a voltage to the motor to increase the dissipation current for a duration. In some examples, the voltage is removed from the motor when the motor reaches a predetermined rotational velocity to avoid reverse rotation.
    Type: Application
    Filed: March 31, 2008
    Publication date: October 1, 2009
    Inventor: Triet Tieu
  • Patent number: 7372226
    Abstract: In a method for shutting off a drive motor (12) of a power tool that drives a tool, the drive motor (12) is shut off as a function of a variable threshold value (E1) if the tool jams. The threshold value (E1) is determined in at least one predetermined time interval (T1) as a function of a current load speed (n1) and a no-load speed (n0).
    Type: Grant
    Filed: November 30, 2004
    Date of Patent: May 13, 2008
    Assignee: Robert Bosch GmbH
    Inventors: Juergen Wiker, Dietmar Hahn, Mario Pauli, Roland Walter, Andreas Heilmann
  • Patent number: 7122982
    Abstract: A rotation information detection device detects rotation information of a DC motor based on a surge component waveform superimposed on a voltage waveform between the terminals of the DC motor or a current waveform of the DC motor, a circuit is provided which supplies a current of a current value Ipwm 45% during motor forward rotation or Ipwm 55% during reverse motor rotation to the motor over the period from when the motor starts braking operation to when it stops.
    Type: Grant
    Filed: May 26, 2005
    Date of Patent: October 17, 2006
    Assignee: Denso Corporation
    Inventors: Takanari Sasaya, Michiru Takahashi
  • Patent number: 7071645
    Abstract: A braking device for an electric motor of a power tool has a short circuit switch for short circuiting an armature winding of the electric motor during a braking process, the short circuit switch for controlling its switch condition having a control input, a control unit connected with the control input of the short circuit switch for performing a phase control of the short circuit switching during the braking process in order to avoid brush fire; also an electrical device with such a braking device and a braking method are proposed as well.
    Type: Grant
    Filed: April 14, 2004
    Date of Patent: July 4, 2006
    Assignee: Robert Bosch GmbH
    Inventors: Dietmar Hahn, Roland Walter
  • Patent number: 7014000
    Abstract: A patient support including a propulsion device for moving the patient support. An automatic braking system is provided to selectively brake the patient support.
    Type: Grant
    Filed: January 3, 2003
    Date of Patent: March 21, 2006
    Assignee: Hill-Rom Services, Inc.
    Inventors: Joseph A. Kummer, Ronald P. Kappeler, Michael M. Frondorf, David P. Lubbers
  • Patent number: 6867561
    Abstract: An electrical machine comprises a rotor without windings, a stator having an armature winding 24, 25 and a field winding 10 for generating a magnetomotive force in a direction extending transversely of the magnetomotive force generated by the armature winding. An electronic circuit 40 is provided for controlling the current in the armature winding 24, 25 such that periods in which a magnetomotive force in one direction is associated with a first current pulse alternate with periods in which a magnetomotive force in the opposite direction is associated with a second current pulse. A position sensor is provided for monitoring the rotational position of the rotor and for supplying output signals at a rate dependent on the speed of rotation of the rotor. Furthermore a control system supplies control signals to the circuit 40 to control the current in the armature winding 24, 25 in response to the output signals.
    Type: Grant
    Filed: August 17, 2000
    Date of Patent: March 15, 2005
    Assignees: Black & Decker, Inc., University of Warwick
    Inventors: Charles Pollock, Helen Geraldine Phyllis Pollock, Richard Thomas Walter
  • Publication number: 20040104698
    Abstract: A motor and brake assembly having a disengaging mechanism for use with RV's are disclosed. The assembly includes a motor and a disengaging mechanism that is mounted thereon. The disengaging mechanism includes a motor mount comprised of a cylindrical piece with a plurality of holes disposed on the periphery of an outer flange of the cylindrical piece. The cylindrical piece extends over the barrel of the motor and is secured to the barrel with a plurality of screws. Through manipulation of the cylindrical piece, the user can selectively engage or disengage the brake from the motor.
    Type: Application
    Filed: November 21, 2003
    Publication date: June 3, 2004
    Applicant: RBW Industries, Inc.
    Inventor: Raymond Willis Blodgett
  • Patent number: 5825154
    Abstract: A method of smoothly stopping pump drives without pressure surges is provided. To accomplish this, the phase control angle between the motor current and the motor voltage is increased according to a linear ramp starting from 0.degree. with the help of an a.c. power controller, where the phase angle decreases and reaches a turning point. If the turning point is detected by observing the phase angle, the phase control is based on this by means of a controller with a predefined linear phase angle reference curve as a function of time. Then the motor rpm does not change abruptly because a rapid change in phase angle is prevented.
    Type: Grant
    Filed: September 25, 1996
    Date of Patent: October 20, 1998
    Assignee: Siemens Aktiengesellschaft
    Inventors: Diethard Runggaldier, Johann Seitz
  • Patent number: 4954759
    Abstract: The electromagnetic braking arrangement comprises an exciting winding which is supplied from a generator winding which on the one hand excites the generator winding and on the other hand induces a braking torque in a short-circuited winding moved with the generator winding. The excitation current of the exciting winding is controlled by a transistor of a current-regulating circuit which holds the excitation current and thus the braking torque at a level adjustable at a reference voltage source. The iron circuit of the exciting winding has residual magnetic properties which ensure an initial self-excitation. The components of the control circuit are supplied with operating voltage from the generator winding via a rectifier circuit. A resistor, which is directly connected to the rectifier circuit, controls the transistor in the conductive state even when the operating voltage is insufficient for proper operation of the control circuit.
    Type: Grant
    Filed: March 16, 1988
    Date of Patent: September 4, 1990
    Assignee: Fichtel & Sachs AG
    Inventor: Rainer Fey
  • Patent number: 4533021
    Abstract: A safety device for the emergency evacuation of a cabin at a safe floor in an elevator shaft includes a main motor, a three-phase current cable, a conveyor, an electric brake, an inertia flywheel, wheels positioned around the outer periphery of the inertia flywheel for driving/stopping such flywheel, a gripper frame positioned around the outer periphery of the inertia flywheel for pushing the driving/stopping wheels against such outer periphery, an electromagnet for actuating the gripper frame, and an auxiliary motor for supplying electrical energy to the driving/stopping wheels.
    Type: Grant
    Filed: November 15, 1983
    Date of Patent: August 6, 1985
    Inventor: Marcelino Perez de la Orden
  • Patent number: 4276500
    Abstract: A braking system for transportation apparatus, such as an escalator, having an electrical drive. The braking effort applied when the transportation apparatus is to be stopped is inversely proportional to the electrical energy being consumed by the electrical drive at the time the stopping decision is made.
    Type: Grant
    Filed: March 28, 1979
    Date of Patent: June 30, 1981
    Assignee: Westinghouse Electric Corp.
    Inventors: Elmer H. Sumka, Henry J. Shea
  • Patent number: 4249117
    Abstract: An impending kickback condition in the operation of a power tool or machine tool system is sensed and used to control or eliminate the kickback. The ability to sense an impending kickback condition can be used in all categories of power driven tools. The change in force applied to the power driven tool or other implement is monitored with a microcomputer by measuring the rate of change of current. If the current is increasing, the microcomputer compares the rate of change of current with a threshold value which may be either preset or computed by the microcomputer. If this threshold value is exceeded, an output control signal is generated by the microcomputer which inhibits the coupling of power to the tool or other implement and/or applies a brake to stop the tool or implement. In order for power to once again be coupled to the tool or implement, the start switch must be opened and then reclosed or some other signal provided by the operator or another predetermined condition must be fulfilled.
    Type: Grant
    Filed: May 1, 1979
    Date of Patent: February 3, 1981
    Assignee: Black and Decker, Inc.
    Inventors: Jill L. Leukhardt, David A. Saar
  • Patent number: 4136305
    Abstract: A power converter control apparatus comprising continuously controlled converter units and on-off controlled converter units for effecting powering control and regenerative braking control of a DC motor, which is arranged to include a unit change circuit for generating unit changing operation signals in response to a command for instructing the number of the converter units to be rendered operative from a master controllerand conduction phase signals from a phase shifter. In accordance with the unit changing operation signals, the conduction phase signals from the phase shifter are applied as a gate signal to the continuously controlled converter units in response to a powering control or a regenerative braking command, while a minimum conduction phase signal is applied as a gate signal to the on-off controlled converter units in response to a powering control command signal and a maximum conduction phase signal including a commutation marginal angle in response to a regenerative braking command signal.
    Type: Grant
    Filed: October 26, 1977
    Date of Patent: January 23, 1979
    Assignee: Hitachi, Ltd.
    Inventors: Yoshio Okumura, Genichi Matsumoto, Kyozo Tachibana, Yoshio Nozaki
  • Patent number: 4124812
    Abstract: In cases of subjecting an electric motor operated vehicle to electric braking, regenerative braking is performed during the first stage of the braking operation thereby supplying the armature current to the battery as a load, and a plugging operation is performed during the last stage thereof to complete the braking operation, whereby the efficiency of operation is enhanced by conserving the armature current to extend the traveling distance of the vehicle per charge of the vehicle battery, and the generation of excessive heat in the motor is suppressed.
    Type: Grant
    Filed: November 16, 1976
    Date of Patent: November 7, 1978
    Assignee: Hitachi, Ltd.
    Inventors: Shotaro Naito, Masahiko Ibamoto, Hisakatsu Kiwaki, Yoshimitsu Onoda
  • Patent number: 4051421
    Abstract: A control system for effecting smooth braking resistor staging of a chopper controlled direct current electric motor. The control system utilizes auxiliary switches mechanically coupled to resistor by-pass contacts to sense actual motion of the by-pass contacts and to provide signals for reducing the chopper duty factor. In a preferred embodiment the chopper duty factor is reduced to an intermediate level between maximum and minimum duty factor by modification of an error signal representing the difference between actual motor current and commanded motor current so as to maintain the control system in a closed loop condition.
    Type: Grant
    Filed: December 16, 1975
    Date of Patent: September 27, 1977
    Assignee: General Electric Company
    Inventors: Thomas Richard Brinner, Thomas Deltor Stitt
  • Patent number: 3995204
    Abstract: A control system for a DC electric traction motor which eliminates cogging of the motor during transition from a driving to a plugging mode. The system incorporates apparatus for comparing motor armature current to a plugging current reference voltage which voltage is initially applied as a ramp function to thereby provide a smooth transition into braking.
    Type: Grant
    Filed: December 20, 1974
    Date of Patent: November 30, 1976
    Assignee: General Electric Company
    Inventors: Charles Edward Konrad, Joe Chester Lambert