With Braking Patents (Class 318/269)
  • Patent number: 11353849
    Abstract: An object is to provide a numerical control system of an industrial machine which can suitably add overrides for “each program” or “each of the individual steps within the program” and to thereby prevent a decrease in the quality of a machined surface and the occurrence of a defective part caused only by the fact that an operator desires to change overrides. An override function unit includes: an override specification operation unit for specifying an override; an override restriction command program which is incorporated in a program of a numerical controller (CNC) either according to the operation of the override specification operation unit or previously; an override value determination unit which determines an override value based on the override restriction command program; and an automatic operation execution unit for automatically operating the industrial machine based on an override restriction range determined in the override value determination unit.
    Type: Grant
    Filed: April 22, 2020
    Date of Patent: June 7, 2022
    Inventor: Yasuhiro Ota
  • Patent number: 11050367
    Abstract: A long-life motor driving device is realized. A motor driving device (11) includes: a motor driving circuit (3) configured to supply an alternating electric current to a motor (2); and a dynamic braking circuit (4). The dynamic braking circuit includes: a mechanical switch (SW2) configured to cause a short circuit between windings corresponding to respective two phases; a semiconductor switch (SW1) connected to the mechanical switch in parallel and configured to cause a short circuit between the windings corresponding to the respective two phases; and a first impedance circuit (Z1) connected to the semiconductor switch in series.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: June 29, 2021
    Inventor: Shengpei Wang
  • Patent number: 10821581
    Abstract: A torque limit apparatus includes a user interface device that receives a speed setting value and a torque setting value of a motor from a user and outputs a state of the motor and a motor control device that controls a speed of the motor depending on speed set by the user and to interrupt an operation of the motor when torque of the motor reaches torque set by the user.
    Type: Grant
    Filed: October 9, 2017
    Date of Patent: November 3, 2020
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Myoung Seok Lee, Young Kook Lee, Joo Yong Yeo
  • Patent number: 10630214
    Abstract: A direct current (DC) motor controller includes first and second electrode terminals, a motor switch and a control unit. The first and second electrode terminals are connected to a DC electric power source, and cooperatively conduct DC electric current therefrom to the DC motor. The motor switch has first and second terminals. The first terminal is connected to a DC motor. The second terminal is connected to the second electrode terminal. The motor switch is switchable between a first state and a second state. The control unit is connected between the first and second electrode terminals, and controls the motor switch to switch between the first and second states.
    Type: Grant
    Filed: September 12, 2018
    Date of Patent: April 21, 2020
    Assignee: HURD PRECISION CO., LTD.
    Inventor: Feng-Ho Wang
  • Patent number: 10563332
    Abstract: A closed-loop control device of a mechanical sewing machine includes an isolated switch-mode power supply module, a DC motor, a speed control module, a processor, an electronic switch, a current detection module and a voltage detection module. The isolated switch-mode power supply module rectifies an AC power to a DC power and supplies the DC power to the DC motor. The speed control module sends a speed signal to the processor. The processor adjusts an output voltage to the DC motor according to the speed signal. The current detection module and the voltage detection module further detect an operating current signal and an operating voltage signal of the DC motor for the processor to control a turn-on time of the electronic switch to adjust an average operating voltage of the DC motor according to the operating current signal, the operating voltage signal and the speed signal.
    Type: Grant
    Filed: March 9, 2017
    Date of Patent: February 18, 2020
    Inventor: Hsuan-Tai Chen
  • Patent number: 10305407
    Abstract: Controllers, method and programs for controlling machines are provided. For example, A method comprises determining a resistance value for a loss compensation resistor, updating at least one control equation based on an equivalent circuit using the resistance value and controlling the machine based on the updated at least one control equation. The resistance value represents a plurality of electro-magnetic losses of a machine. The resistance value can be determined from an inverse resistance value.
    Type: Grant
    Filed: February 26, 2015
    Date of Patent: May 28, 2019
    Assignee: BAE Systems Controls Inc.
    Inventors: Robert J. Vovos, Arthur P. Lyons
  • Patent number: 10298156
    Abstract: A driving device for driving a first motor to transmit a driving force to a driven object and a second motor to transmit a driving force to the driven object include a controller and a corrector. The controller outputs a first voltage command value to drive the first motor and a second voltage command value to drive the second motor. The corrector corrects the first voltage command value and the second voltage command value, based on a parameter relating to driving of the first motor and the second motor obtained when an output torque of the first motor and an output torque of the second motor are applied to the driven object in opposite directions.
    Type: Grant
    Filed: February 27, 2018
    Date of Patent: May 21, 2019
    Assignee: Ricoh Company, Ltd.
    Inventor: Takahisa Koike
  • Patent number: 10114390
    Abstract: A fan control system, a computer system, and a fan controlling method thereof are disclosed. The fan control system is used in the computer system for controlling a fan device. The fan controlling method includes the following steps: obtaining a temperature value of the computer system; determining whether the temperature value of the computer system is larger than or equal to a predetermined temperature value; if yes, controlling a rotation speed of the fan device according to the temperature value; if no, further obtaining a current value via a heat generating electronic component of the computer system; determining whether the current value of the computer system is larger than or equal to a predetermined current value; and if yes, changing the rotation speed of the fan device according to a variation of the current value.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: October 30, 2018
    Inventors: Po-Chuan Chen, Shih-Huai Cho
  • Patent number: 10103676
    Abstract: A fan motor braking apparatus includes a fan motor, a conversion circuit and a motor driver circuit. The conversion circuit is respectively and electrically connected to the fan motor and the motor driver circuit. The conversion circuit includes bridge structures. After the fan motor starts operating, the motor driver circuit receives at least one fan status signal and determines whether the fan motor braking apparatus enters a braking status or not according to the at least one fan status signal. When the fan motor braking apparatus enters the braking status, the motor driver circuit outputs a braking control signal to the conversion circuit so that the bridge structures of the conversion circuit generate a brake effect on fan motor, wherein the at least one fan status signal includes an external speed-control signal and a transition voltage signal of the fan motor.
    Type: Grant
    Filed: October 27, 2016
    Date of Patent: October 16, 2018
    Inventors: Wei-Shuo Tseng, Chia-Feng Wu, Yi-Chieh Cho, Yun-Hua Chao, Po-Tsun Chen
  • Patent number: 9688154
    Abstract: An electrically powered vehicle includes a motor generator configured to be capable of transmitting and receiving torque to and from a driving shaft coupled to a driving wheel; a DC power supply including a power storage device; and an inverter for performing bidirectional DC/AC power conversion between the DC power supply and the motor generator. The MG-ECU controls a plurality of power semiconductor switching elements to be turned on/off in accordance with a torque command value and a state value of the motor generator. When an accelerator pedal is released, the MG-ECU controls the inverter to superimpose a DC current component on an AC current of each phase in the motor generator in accordance with the state of charge of the power storage device.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: June 27, 2017
    Inventors: Makoto Nakamura, Ryoji Sato, Takaya Soma
  • Patent number: 9632491
    Abstract: A reconfigurable drive current system includes drive stages, each of which includes a high-side transistor and a low-side transistor in a totem pole configuration. A current monitor is coupled to an output of each drive stage. Input channels are provided to receive input signals. A processor is coupled to the input channels and to each current monitor for generating at least one drive signal using at least one of the input signals and current measured by at least one of the current monitors. A pulse width modulation generator is coupled to the processor and each drive stage for varying the drive signals as a function of time prior to being supplied to at least one of the drive stages.
    Type: Grant
    Filed: June 18, 2014
    Date of Patent: April 25, 2017
    Assignee: The United States of America as Represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Dean C. Alhorn, Kenneth R. Dutton, David E. Howard, Dennis A. Smith
  • Patent number: 9067600
    Abstract: A vehicle powertrain system has an engine, a damper and an electric machine configured to be selectively mechanically coupled with the engine via damper. The vehicle powertrain system also has at least one controller programmed to filter a frequency content of a speed or torque command for the electric machine corresponding to a resonant frequency of the engine, damper and electric machine to reduce resonance of the engine, damper and electric machine.
    Type: Grant
    Filed: July 26, 2013
    Date of Patent: June 30, 2015
    Assignee: Ford Global Technologies, LLC
    Inventors: Wei Liang, Carol Louise Okubo, Thomas Chrostowski, Ming Lang Kuang
  • Patent number: 9046044
    Abstract: Provided is a vehicle control apparatus that can prevent the deterioration of drivability. An ECU executes a reduction control when speed reduction of a vehicle is determined as a control permit condition is established, and does not execute the reduction control when the speed reduction is not determined as the condition is not established. Additionally, when determined that a vehicle behavior stabilization control that stabilizes behavior of the vehicle is being executed, the ECU determines the speed reduction of the vehicle by changing a speed reduction threshold value for determining the speed reduction. This makes it possible to adequately determine the speed reduction of the vehicle even when a drive state of the vehicle is changed by the execution of the vehicle behavior stabilization control, thereby allowing the execution and non-execution of the reduction control to be switched reflecting a driver's intention and thus preventing the drivability from being deteriorated.
    Type: Grant
    Filed: March 29, 2010
    Date of Patent: June 2, 2015
    Inventors: Michihito Shimada, Yuki Minase, Toshiya Oishi, Tsutomu Miyazaki, Masashi Takagi, Kenichi Okaya
  • Patent number: 8508170
    Abstract: A driving device for a hatch in a vehicle, with a housing tube connected to a base part or to a movable structural component part, a protective tube connected to the movable structural component part or to the base part, a spindle drive having a threaded spindle and a spindle nut arranged on the threaded spindle by which the housing tube and the protective tube are movable axially relative to one another. A rotary drive drives the spindle drive in rotation includes at least one electric motor. The driving device has a safety circuit that causes a braking effect on the rotary drive when the rotary drive is deactivated and when extraneous forces are introduced into the driving device from the outside.
    Type: Grant
    Filed: September 2, 2010
    Date of Patent: August 13, 2013
    Assignee: Stabilus GmbH
    Inventor: Marian Bochen
  • Patent number: 8482232
    Abstract: A motor drive circuit configured to supply drive currents to drive coils with a plurality of phases of a motor to drive the motor, includes: a trapezoidal wave signal generation circuit configured to output a trapezoidal wave signal whose inclination is changed with a rotation speed of the motor or a target rotation speed of the motor; and a plurality of output transistors configured to output the drive current to the drive coils, respectively, in accordance with the trapezoidal wave signal.
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: July 9, 2013
    Assignee: ON Semiconductor Trading, Ltd.
    Inventor: Toshiyuki Imai
  • Patent number: 8362718
    Abstract: A device for operating a closing part, driven by a drive, on a device of transportation contains a control apparatus which is assigned to the drive and is configured to actuate the drive in order to initiate a measure which is opposed to the movement of the closing part. The drive is embodied as an electric or electromechanical drive. The drive can be actuated by the control apparatus in such a way that the drive becomes active in a braking fashion with respect to the movement of the closing part.
    Type: Grant
    Filed: June 11, 2010
    Date of Patent: January 29, 2013
    Assignee: Dr. Ing. H.C. F. Porsche Aktiengesellschaft
    Inventors: Michael Hubmann, Thomas Ohl
  • Patent number: 8188691
    Abstract: The present disclosure is an apparatus for controlling movement of a decoy. The apparatus for controlling movement of a decoy may include a motor and a housing. The motor may cause movement of a decoy coupled to the motor to simulate movement of an animal. The apparatus for controlling movement of a decoy may include a shaft which couples to the motor and the decoy whereby the motor may cause axial rotation of the decoy.
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: May 29, 2012
    Inventor: Steven J. Twohig
  • Patent number: 8183802
    Abstract: Embodiments of the present invention include a composite electromechanical machine which can operate as a motor, a generator (including dynamo or alternator), or any combination thereof. In an aspect, the present composite electromechanical machine comprises at least a double-sided magnetic plane (e.g., rotor or stator) to form two rotor/stator pairs, together with a controller to configure the multiple rotor/stator pair. The controller can configure or convert the multiple rotor/stator pairs into motors, generators, or nonoperation, and also can change the windings characteristics of the magnetic planes. The controller can add new functionality and characteristics to the present composite electromechanical machine. Other embodiments can also be included.
    Type: Grant
    Filed: January 5, 2009
    Date of Patent: May 22, 2012
    Inventor: Eric Stephane Quere
  • Patent number: 8169170
    Abstract: A motor driving device (100) includes an inverter (20), a speed control unit (40), and a regeneration preventing means (50). The inverter (20) converts supplied DC power to driving power for driving a motor (10), and supplies the driving power to the motor (10). The speed control unit (40) generates a speed control signal group based on a speed command signal Sref and a speed detection signal N, and adjusts the driving power based on a drive control signal VSP1 included in the speed control signal group, thereby controlling the speed of the motor (10).
    Type: Grant
    Filed: April 3, 2008
    Date of Patent: May 1, 2012
    Assignee: Panasonic Corporation
    Inventors: Masahiro Yasohara, Kenji Sugiura
  • Patent number: 8154240
    Abstract: A control apparatus for an electric railcar includes an inverter that exchanges power with an AC rotating machine, a filter capacitor connected in parallel to a DC side of the inverter, a filter reactor provided between the filter capacitor and an overhead line, an overhead line voltage measuring instrument that measures a voltage value of the overhead line, a voltage increase detection unit that senses an amount of voltage increase occurring when, with an overhead line voltage being supplied, the overhead line voltage goes beyond a reference voltage value and rises at a rate equal to or higher than that by a predetermined time constant.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: April 10, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hideto Negoro, Masaki Kono
  • Patent number: 8134316
    Abstract: A system for braking a motor. The system includes at least one resistor and a contactor connected to the at least one resistor and a motor. The system further includes a variable frequency drive electrically connected to the motor, wherein the variable frequency drive comprises a controller operably connected to the contactor, wherein at least a portion of the contactor closes connecting the at least one resistor to the motor in response to a command from the controller. The variable frequency drive is configured such that motor flux levels may be maintained at a relatively high level as motor torque current is reduced, resulting in a consistently high motor flux level as the motor speed decreases.
    Type: Grant
    Filed: February 20, 2009
    Date of Patent: March 13, 2012
    Assignee: Siemens Industry, Inc.
    Inventors: Richard H. Osman, Mukul Rastogi
  • Patent number: 7619379
    Abstract: A motor control device includes a recording module and a controlling module. The recording module has a revolution speed table recording a plurality of predetermined revolution speed values. The controlling module receives a reference revolution speed control signal and measures the reference revolution speed control signal to correspondingly generate a reference measuring value. The recording module records the reference measuring value corresponding to one of the predetermined revolution speed values in the revolution speed table.
    Type: Grant
    Filed: March 15, 2007
    Date of Patent: November 17, 2009
    Assignee: Delta Electronics, Inc.
    Inventors: Hong-Jen Chen, Keittipermsak Rungcharoen, Sukudom Saravut
  • Patent number: 7607963
    Abstract: A control apparatus for opening/closing a vehicle door includes a door opening/closing mechanism for operating the vehicle door, a driving source for driving the door opening/closing mechanism, a connecting/disconnecting apparatus interposed between the door opening/closing mechanism and the driving source, and a controlling apparatus for controlling the connecting/disconnecting apparatus. The controlling apparatus for opening/closing the vehicle door includes a door movement-detecting apparatus for detecting a movement of the vehicle door. The controlling apparatus switches the connecting/disconnecting apparatus from a connected state to a disconnected state when the driving source is stopped during in an opening/closing operation of the vehicle door.
    Type: Grant
    Filed: June 19, 2006
    Date of Patent: October 27, 2009
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Hiroshi Ishihara, Yasuyuki Kozawa, Junichi Matsunaga
  • Publication number: 20080169776
    Abstract: A power supply device for an electric motor, operated either in a normal operating mode and/or an emergency operating mode, in particular, for an actuator in a motor vehicle and a method for operation of an electric motor in a normal operating mode and/or an emergency operating mode, in particular, for an actuator in a motor vehicle. The electric motor is powered by AC in the normal operating mode and by DC in the emergency operating mode, in particular, in a fault situation.
    Type: Application
    Filed: December 15, 2005
    Publication date: July 17, 2008
    Applicant: SCHAEFFLER KG
    Inventor: Christian Acker
  • Publication number: 20070216327
    Abstract: A vehicle drive control system including a motor brake control device. The motor brake control device causes an AC motor to generate a braking force, and selectively executes a first three-phase (3-phase) short-circuiting mode for simultaneously turning on switching elements of an upper arm of an inverter and a second 3-phase short-circuiting mode for simultaneously turning on switching elements of a lower arm of the inverter. The first 3-phase short-circuiting mode and the second 3-phase short-circuiting mode are selectively executed.
    Type: Application
    Filed: March 12, 2007
    Publication date: September 20, 2007
    Applicant: Nissan Motor Co., Ltd.
    Inventor: Yoshinori Sugita
  • Patent number: 7199546
    Abstract: It is disclosed the motor stop control device having the stepping motor 49 as the drive source of the reel 3 on which a plurality of symbols are formed, the motor stop control device being utilized in the reel-type gaming machine 1 and stopping the stepping motor 49 corresponding to the stop instruction from an external. When the stop instruction of the stepping motor 49 occurs based on the instruction from an external, the main CPU 31 drops the voltage value added to the stepping motor which is rotating at the constant speed to the voltage value lower than such voltage value and executes the stop process of the stepping motor 49 by 2-phase excitation.
    Type: Grant
    Filed: September 15, 2004
    Date of Patent: April 3, 2007
    Assignee: Aruze Corp.
    Inventors: Takao Nireki, Yuuichirou Suzuki
  • 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: 7157871
    Abstract: Rotation of a capstan motor is detected by a frequency detector, and supplied to a CPU as a rotation detection signal CFG. The CPU derives a period of the rotation detection signal CFG, calculates an average rotational speed of the capstan motor on the basis of the derived period, derives an attenuation value of the rotational speed on the basis of the calculated average speed, and thereby sets a braking time interval. As a result, calculation of the braking time using a highly accurate zero point detection with a frequency detector of one system becomes possible. The apparatus scale can be reduced.
    Type: Grant
    Filed: March 20, 2001
    Date of Patent: January 2, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Kazuki Azuma
  • Patent number: 7138912
    Abstract: Movement of a movable barrier (10) such as, for example, a vertically-dropping fire door, can be controlled in an informed manner and with greater flexibility regarding the manner of movement via, in one embodiment, use of a motor (20) as a generator to resist the downward movement of the barrier. One or more dummy electrical loads (22) can be used in combination with the generator mode of operation to influence the degree of braking proffered by the motor. In various embodiments, one or more sensors (25, 26, 27) can be used to detect local and remote conditions of interest to thereby at least partially inform the barrier movement decision process. A display (90) (or displays) can serve to provide various kinds of information to authorized personnel and an operator control (120) can serve, at least under some operating circumstances, to permit a person to locally cause a closed barrier to move to at least a partially opened position.
    Type: Grant
    Filed: March 20, 2003
    Date of Patent: November 21, 2006
    Assignee: The Chamberlain Group, Inc.
    Inventors: James J. Fitzgibbon, Andrew Gavel, William Gioia
  • Patent number: 7061194
    Abstract: A method and an apparatus for precisely controlling the rotation speed of a spindle motor in an optical system according to a given condition are provided. The method involves counting in response to a clock signal widths of first and second logic states of an input signal, which varies with rotation speed of the spindle motor, when an operation control command is issued, comparing a predetermined reference value with a count value for one check cycle, and outputting the comparison result; and controlling the constant linear velocity of the spindle motor in response to the comparison result.
    Type: Grant
    Filed: November 4, 2003
    Date of Patent: June 13, 2006
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Je-kook Kim, Young-wook Jang
  • Patent number: 7038410
    Abstract: A method of dynamically damping an electric motor (12) that is controlled by an H-bridge driver (16) by interdigitating power pulses with braking pulses by switching from a power switch mode to a shorting circuit mode with switches (22 and 26) closed that brakes the electric motor.
    Type: Grant
    Filed: December 23, 2002
    Date of Patent: May 2, 2006
    Assignee: Delphi Technologies, Inc.
    Inventor: Dany Paul Delaporte
  • Patent number: 6979976
    Abstract: A driving system for driving a brushless motor effects a rotation control of a rotor by sequentially switching application of a current to magnetic coils disposed in a stator in response to a detection signal from a pole-position detector. The driving system comprises a controlling circuit for generating a driving signal, an inverter control circuit for controlling application of the current to the coils by adjusting opening and closing of switching devices in response to the driving signal, and a rotational speed sensor. The controlling circuit generates a braking signal when a rotational speed of the rotor is beyond a predetermined value, and transmits the braking signal to the inverter control circuit. The inverter control circuit effects a braking control in response to the braking signal by application of the current to at least one coil except those coils being excited upon reception of the braking signal.
    Type: Grant
    Filed: July 7, 2004
    Date of Patent: December 27, 2005
    Assignee: Itoh Denki Co., Ltd.
    Inventor: Toshiyuki Tachibana
  • Patent number: 6885160
    Abstract: The present invention is a drive control device for controlling an electric rotational actuator which moves the driver, including: a reference comparison signal generation circuit; a detection circuit for detecting the speed of the actuator and outputting this as a detection signal; a speed designation circuit of the actuator; a rotation control circuit of the actuator; and a phase comparison circuit for comparing the phase of the reference comparison signal and the phase of the detection signal and outputting the comparison result to the rotation control circuit; wherein the rotation control circuit controls the speed of the actuator to conform with the speed designation based on the phase comparison result.
    Type: Grant
    Filed: April 22, 2002
    Date of Patent: April 26, 2005
    Assignee: Seiko Epson Corporation
    Inventor: Kesatoshi Takeuchi
  • 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: 6836087
    Abstract: A multiphase motor has a plurality of ferromagnetically isolated stator electromagnets distributed about an axis of rotation. Successive ranges of speed during which the motor can be expected to operate are defined. A specific subset of the electromagnets is associated for each speed range, each specific subset comprising a different combination of electromagnets. Respective voltage magnitudes to be applied to each phase winding for each defined speed range are predefined. The motor speed is sensed throughout motor operation. In each defined speed range, only the electromagnets of the associated subset are energized, each of the energized electromagnets having applied thereto a different predefined voltage magnitude.
    Type: Grant
    Filed: January 29, 2003
    Date of Patent: December 28, 2004
    Assignee: Wavecrest Laboratories, LLC
    Inventor: Alexander A. Gladkov
  • Patent number: 6737828
    Abstract: A washing machine motor drive device drives a motor using an inverter circuit, which implements a constant torque control through a change in the torque-revolution speed characteristic of the motor. This facilitates an easy control of braking torque (negative torque), thereby providing a maximized braking torque. An easy control of regenerative energy is also provided, and back electromotive force is consumed by the internal resistance of the motor. Practically described, DC power of a rectifier circuit connected to an alternating current source is converted by an inverter circuit into AC power for driving the motor for operating an agitator or a washing/spinning tub. Motor rotor position is detected by rotor position detector, motor current is detected by current detector, and a control device controls the inverter circuit for resolving the motor current into a current component corresponding to magnetic flux and a current component corresponding to torque.
    Type: Grant
    Filed: July 2, 2002
    Date of Patent: May 18, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Mitsuyuki Kiuchi, Norimasa Kondo, Sadayuki Tamae, Hisashi Hagiwara
  • Patent number: 6601513
    Abstract: A motor control method and apparatus for stopping an object moved by a motor accurately at a predefined target position, shortening the time period required in stop control, in which the motor is driven at a first (high) speed up to a distance from the target position adequate for stop control and then is sequentially braked to a predetermined speed lower than the first speed, driven at a second (low) speed up to a distance from the target position equal to the stopping distance, and braked to a stop. The method and apparatus are used in a time recorder. An impact printing apparatus is also disclosed with printing pin actuation timing correction dependent upon scanning speed or platen shape, striking duration timing dependent upon scanning rate, or printing pin actuation timing dependent upon stored shift amounts.
    Type: Grant
    Filed: May 24, 2000
    Date of Patent: August 5, 2003
    Assignee: Seiko Precision, Inc.
    Inventor: Kenji Ozawa
  • Patent number: 6538411
    Abstract: A system and method for automatically decelerating a personal transporter of the kind that has a controller for controlling the motion of the transporter. Upon detection of a fault condition, a goal value of a control variable is set, the control variable is adjusted at a specified increment in the direction of the goal value, and the prior steps are repeated until the control variable equals the goal value. A method is also provided that affords a user accelerated access to operation of a balancing personal transporter. The method has the steps of first initializing a single-axis stabilizer, and, while initializing a 3-axis stabilizer, alerting the rider that the transporter is ready for use, allowing operation of the transporter, and then completing initialization of the 3-axis stabilizer, and employing the 3-axis stabilizer for control of the balancing personal transporter.
    Type: Grant
    Filed: October 13, 2000
    Date of Patent: March 25, 2003
    Assignee: Deka Products Limited Partnership
    Inventors: J. Douglas Field, John B. Morrell
  • Patent number: 6538412
    Abstract: To minimize the energy required for operation of a rail vehicle, in a drive system that has an intermediate circuit converter 1 and a three-phase motor 7 fed by it, the intermediate circuit voltage in the intermediate circuit 12 and/or the magnetic flux in the drive motor 7 are optimized to correspond to the actual operating requirements, including, if necessary, the energy expenditure for the auxiliaries 9 that are provided to cool the components.
    Type: Grant
    Filed: April 12, 2001
    Date of Patent: March 25, 2003
    Assignee: DaimlerChrysler Rail Systems GmbH
    Inventors: Christian Klose, Frank Unger-Weber
  • Patent number: 6429609
    Abstract: In a drive device which is especially suitable for moving and turning the slats of a blind in a runner and in which the rotational movement of a drive wheel (2) can be alternately transmitted to a turning drive means effecting the rotational movement of the slats and to a transport drive means effecting the movement of the salts in the runner, the drive wheel (2) is driven by electric motor and, in addition, the shift of the change gear from its one shifting position into the other shifting position is effected by an electrical signal. For this purpose, a toothed sleeve (3) driving the transport drive means and a toothed sleeve (4) driving the turning drive means is alternately coupled to a drive tube (1), which can be driven via the drive wheel (2), in dependence on the relative rotational position of a reversing shaft (10) in the drive tube (1) via locking members (7, 8) arranged on its periphery.
    Type: Grant
    Filed: December 6, 2000
    Date of Patent: August 6, 2002
    Assignee: Trietex Antriebstechnik GmbH
    Inventor: Walter Hugin
  • Patent number: 6342769
    Abstract: A throttle/brake control system has a first member, a second member and a mount for mounting the members for relative movement on either side of a home position, the members being biased relatively to that home position. A variable resistor track having an end is mounted to the first member along with a conductive power track having a gap. A conductive wiper is mounted to the second member opposite the first member, the wiper being arranged to slide along both the resistor track and the power track when the first and second members are moved relatively away from the home position and to repose opposite the gap when the first and second members are in the home position.
    Type: Grant
    Filed: November 7, 2000
    Date of Patent: January 29, 2002
    Inventors: Orville J. Birkestrand, William A. Peterson
  • Patent number: 6268708
    Abstract: In control devices of electric power steering systems, steering characteristics are improved by control being carried out by means of a signal based on rotor speed or steering angle after failure of a torque sensor is detected.
    Type: Grant
    Filed: December 14, 1999
    Date of Patent: July 31, 2001
    Assignee: NSK Ltd.
    Inventors: Hideaki Kawada, Shuji Endo
  • Patent number: 6157153
    Abstract: A motor driver has a braking control circuit. The braking control circuit shuts off the supply of an electric current to the coils included in the motor when a motor control signal shifts to a predetermined level and, after a predetermined length of time secured in accordance with an index signal, starts application of braking to the rotation of the motor by the use of a braking circuit. The index signal is obtained from the signal that indicates the rotational position of the motor. The motor control signal is fed from a control signal generating circuit to the braking control circuit.
    Type: Grant
    Filed: April 9, 1999
    Date of Patent: December 5, 2000
    Assignees: Rohm Co., Ltd., Teac Corporation
    Inventors: Tomoaki Uegami, Takahiro Sakaguchi
  • Patent number: 6108592
    Abstract: A motorized wheel-chair is equipped with one or more sensors for detecting obstacles. The detection method may be either radar or sonar (or both). An on-board computer processes these echoes and presents a visual or auditory display. With the benefit of these displays, the user issues voice commands (or exerts manual pressure) to maneuver appropriately the motorized wheelchair. One or more microphones pick up the sounds of the user's voice and transmit them to a computer. The computer decodes the maneuvering commands by speech-recognition techniques and transmits these commands to the wheelchair to effect the desired motion. In addition to speech recognition for decoding commands, voice (speaker) recognition is employed to determine authorized users.
    Type: Grant
    Filed: May 7, 1998
    Date of Patent: August 22, 2000
    Assignee: International Business Machines Corporation
    Inventors: Jerome M. Kurtzberg, John Stephen Lew
  • Patent number: 5909097
    Abstract: A method of stopping an electric motor-driven balancing machine main shaft after an unbalance measuring run in a specific rotary angle stoppage position corresponding to a desired balancing rotary angle position provides that in the course of retardation of the main shaft, a timer is switched on at a short angular spacing of for example 3.degree. before the main shaft reaches the desired rotary angle stoppage position. The timer predetermines a time interval which is determined from the rotary speed and the rotary angle position of the main shaft at the time of the timer being switched on, with the retardation operation being stopped at the end of that time interval, with the main shaft stationary. The retardation operation can be effected by torque reversal of the motor.
    Type: Grant
    Filed: September 4, 1997
    Date of Patent: June 1, 1999
    Assignee: Hofmann Werkstatt-Technik GmbH
    Inventors: Karl Rothamel, Wolfgang Rowe
  • Patent number: 5859516
    Abstract: The invention relates to a method for the anticipatory speed control, effective over a plurality of blocks, of an electric drive, in an anticipatory analysis of the braking requirements of a plurality of subsequent control data blocks. The braking requirements are necessary for the reliable reduction to the programmed feed rate for the electric drive. The limiting conditions such as admissible track acceleration and block length, are projected onto the necessary braking path, so that the shortest braking ramp determined in each case represents the limiting condition. The braking ramps for a plurality of parametrable override transition values are assigned to each control data block analyzed as characteristic data in a data store.
    Type: Grant
    Filed: August 14, 1997
    Date of Patent: January 12, 1999
    Assignee: Siemens Aktiengesellschaft
    Inventors: Jurgen Muller, Wolfgang Speth, Wilhelm Westermeyer
  • Patent number: 5847522
    Abstract: A positive locking device is provided in order to prevent a motor from rotating after power has been removed. The positive locking device has a plate mounted on the motor which engages a disk or hub on the shaft of the motor. In another aspect of the invention, solid state circuitry for switching a permanent magnet motor and providing dynamic braking thereto is provided. The circuitry allows the back EMF generated by the armature coils of a permanent magnet motor to cause a current to flow through the motor when power is removed. This back EMF may be used to help produce smooth engagement of the locking device. In another aspect of the invention, a dynamic braking circuit for a dual armature permanent magnet motor is provided. By applying current to one or the other of two oppositely wound armature coils the motor is made to rotate in either direction. When power is removed from the active armature, this armature is short-circuited through a diode.
    Type: Grant
    Filed: November 13, 1995
    Date of Patent: December 8, 1998
    Assignee: GEC-Marconi Aerospace Inc.
    Inventor: Valentin Barba
  • Patent number: 5838124
    Abstract: A brushless DC motor is controlled by determining a speed of the motor and a line voltage supplying drivers of the motor. Based upon these determined values and predetermined motor performance data, a maximum PWM on-time is determined for drive signals supplied to windings of the motor. This maximum PWM on-time thereby limits motor torque output to a predetermined maximum. Stopping the motor is performed in sequential phases including a loaded generator phase, an active braking phase and a holding phase. During holding, the amount of energy supplied to the motor is reduced to the point just before slippage such that holding energy is minimized. Upon power failure, the motor is driven toward a spring return home position overcoming static friction that may prevent the spring return mechanism from functioning properly. These techniques are applied to a motor in an actuator.
    Type: Grant
    Filed: August 28, 1997
    Date of Patent: November 17, 1998
    Assignee: Barber Colman
    Inventor: Michael L. Hill
  • Patent number: 5726550
    Abstract: A motor control system for controlling power supplied to an electric motor rotating a rotor employed in a centrifuge is provided. The motor control system includes first, second, and third converters and first and second smoothing capacitors. In a motor power mode, the first converter operates to transfer the charged energy in the first smoothing capacitor to the second smoothing capacitor for providing power to the motor through the third converter, while the second converter transfers, in a motor braking mode, the charged energy in the second smoothing capacitor to the first smoothing capacitor to return the power regenerated by the motor during a braking operation to the AC power supply through the first converter. The second converter performs a function of providing an initial energizing energy to the motor for a given period of time at the start of the braking operation for stability of a power-regenerating operation of the motor.
    Type: Grant
    Filed: July 30, 1996
    Date of Patent: March 10, 1998
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Masahiro Inaniwa, Shinji Watanabe, Noriyasu Matsufuji, Katsunori Akatsu
  • Patent number: 5708343
    Abstract: A device includes an FET 206 interposed between one end of a motor 201 and a positive electrode of a battery EB; a diode 203 for circulating an electric current so as to flow through the motor 201 after the switching means is turned off, the electric current is the same as that which has flown through the motor 201 before the switch 220 is turned off; a shunt 203a, differential amplifier 203b, and a low-pass filter 203c as means for detecting a value of an electric current flowing to the motor 210; and a controller 250 for turning on and off the switching means by the PWM control, so that the value of the electric current detected by the current detection means coincides with a target value. The controller 250 sets a very small value as the target value when the motor is rotated by inertia thereof, and supplying the electric current of the small target value to the motor 201.
    Type: Grant
    Filed: October 29, 1996
    Date of Patent: January 13, 1998
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Nobuo Hara, Hiroaki Ogata, Masaya Suenari