Condition Of Motor Or Driven Device Patents (Class 318/366)
  • Patent number: 9484846
    Abstract: A drive system includes a line assembly configured to connect a power converter to an electric motor which has a brake and an encoder. The line assembly has at least two power lines and only two brake lines exclusively to provide a data transfer between the power converter and the electric motor and to transfer energy to the encoder. The power converter applies a first supply voltage of a first polarity and a second supply voltage of a second polarity opposite to the first polarity to the brake lines for supplying the brake and the encoder. The electric motor supplies the encoder with the respective supply voltage independently of its polarity and the brake with the respective supply voltage depending on its polarity.
    Type: Grant
    Filed: September 17, 2014
    Date of Patent: November 1, 2016
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventor: Andreas Kuhn
  • Patent number: 9318982
    Abstract: According to a control apparatus for an AC motor, a switching section selects a two-phase control current value as a current fixing value, when a first current detection value of a first phase of the AC motor and a second current detection value of a second phase of the AC motor are normal. The switching section selects an one-phase control current value, which is calculated based on a normal phase current detection value, which is a value of the normal phase and is one of the first and the second current detection values, as the current fixing value, when it is determined that the current supplied to the AC motor has been stabilized after an abnormality is detected in part of the first and second detection values.
    Type: Grant
    Filed: November 5, 2014
    Date of Patent: April 19, 2016
    Assignee: DENSO CORPORATION
    Inventors: Ryuji Omata, Takahumi Oowada
  • Publication number: 20140354197
    Abstract: There is obtained a configuration capable of rapidly decelerating a motor even if a failure occurs in the communication between a controller and a motor control unit in a motor controller in which a speed command is input from the controller to the motor control unit. A motor controller 1 is provided with a main controller 2, and a motor control unit 3 configured to be communicable with the main controller 2 to drive a motor M according to a torque command output from the main controller 2. The motor control unit 3 includes a speed control unit 31 for outputting a torque command, so as to decelerate the motor M, if any failure occurs in communication with the main controller 2 while the motor M is being driven.
    Type: Application
    Filed: May 29, 2014
    Publication date: December 4, 2014
    Applicants: SINFONIA TECHNOLOGY CO., LTD., KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Takeo Ito, Hideaki Moriya, Takeshi Tomizaki, Akira Nakazumi, Yusuke Kamimura
  • Patent number: 8890464
    Abstract: A drive system for a grid blower of a vehicle is provided. The system includes: an electrical bus, a grid of resistive elements connected to the electrical bus, the grid of resistive elements configured to thermally dissipate electrical power generated from braking of the vehicle, the electrical power being transmitted on the electrical bus to the grid of resistive elements, an electrical power modulation device configured to modify electrical power received from at least one of the electrical bus and the grid of resistive elements, and a grid blower motor coupled to an output of the electrical power modulation device, wherein a speed of the grid blower motor varies based on the electrical power that has been modified by the electrical power modulation device.
    Type: Grant
    Filed: April 18, 2012
    Date of Patent: November 18, 2014
    Assignee: General Electric Company
    Inventors: Ajith Kuttannair Kumar, Bret Worden, Sudhir Kumar Gupta, Theodore Clark Brown
  • Patent number: 8878468
    Abstract: An electric machine assembly with fail-safe arrangement is described. The assembly comprises a stator including a plurality of windings and a cooperating rotor including at least one permanent magnet; a detector configured to detect DC current in at least one of the windings of the stator; and a bypass circuit configured to be activated upon detection of the DC current by the detector and to prevent at least some of the DC current from flowing into the at least one of the windings of the stator.
    Type: Grant
    Filed: April 29, 2011
    Date of Patent: November 4, 2014
    Assignee: Pratt & Whitney Canada Corp.
    Inventor: Kevin Allan Dooley
  • Patent number: 8847525
    Abstract: To provide a motor control device which can apply an electric brake to a motor when power supply is stopped, and achieve a miniaturization and a cost reduction. A first switch 11 through a sixth switch 16 connects respective coils L1, L2 and L3 included in a motor to an electric power source 20. The capacitor C accumulates the power supplied from the electric power source 20. A seventh switch 17 connects the capacitor C to a fourth switch 14 through the sixth switch 16, when the power supply from the electric power source 20 is stopped. The operation of the seventh switch 17 causes the fourth switch 14 through the sixth switch 16 to operate by the power accumulated in the capacitor C, and respective coils L1 to L3 are short-circuited to apply the brake to the motor.
    Type: Grant
    Filed: January 23, 2013
    Date of Patent: September 30, 2014
    Assignee: Sanyo Denki Co., Ltd.
    Inventors: Noriaki Taniguchi, Takahisa Toda, Yo Muramatsu
  • Patent number: 8704466
    Abstract: The method is capable of equalizing time lengths of stopping a motor at load-holding stop positions of respective phases so as to average amounts of heat generation of phase coils. The method for drive-controlling electric machinery, in which a multiphase motor is used as a driving source of an assist mechanism, is performed by a control unit including a driving circuit for driving the multiphase motor. The method is characterized in that the control unit controls to stop a rotor at a load-holding stop position, at which rotation of the rotor is stopped in a state where a motor coil is energized and the rotor is in a load-holding state, and that the load-holding stop position is angularly shifted an electric angle of 180/n (n is number of phases and an integer two or more) degrees, in a prescribed rotational direction, with respect to a previous load-holding stop position of the rotor.
    Type: Grant
    Filed: June 6, 2011
    Date of Patent: April 22, 2014
    Assignee: Shinano Kenshi Kabushiki Kaisha
    Inventor: Nobuchika Maruyama
  • Publication number: 20130253485
    Abstract: A system includes at least one device that includes at least one device component. For a defined movement of the at least one device component, a movement axis and/or a movement direction may be selected by a selection element and may be identified by an activatable lighting element. The identified movement axis and/or the identified movement direction may be released by at least one actuation element, so that a desired movement of the at least one device component may be performed.
    Type: Application
    Filed: September 13, 2012
    Publication date: September 26, 2013
    Applicant: Siemens Aktiengesellschaft
    Inventors: Jens Fehre, Andreas Limmer, Ralf Nanke, Manfred Sechser
  • Patent number: 8427086
    Abstract: An electric drive system comprises a generator, a traction motor, a brake resistor, a bus, and a control unit. The generator, the traction motor, and the brake resistor are coupled electrically to the bus. The control unit is configured to determine a pulse-width-modulation duty cycle for the brake resistor (“brake duty”) and control operation of the brake resistor according to the brake duty, wherein the brake duty can be a value intermediate of constant OFF and constant ON. A method of operating the electric drive system is also disclosed.
    Type: Grant
    Filed: April 26, 2010
    Date of Patent: April 23, 2013
    Assignee: Deere & Company
    Inventor: Zimin W. Vilar
  • Patent number: 8299735
    Abstract: A fan system including a motor with a coil, a storage unit, a driver, and a buffer circuit is provided. The coil module has a first connection terminal and a second connection terminal. The storage unit electrically couples with a voltage source, stores electrical energy when the voltage source is available, and releases the stored electrical energy to carry out a brake operation when the voltage source is unavailable. The driver electrically couples with the first and second connection terminals of the coil module to control a direction of an inductor current passing through the coil module. The buffer circuit electrically couples with the coil module. In the brake operation, the buffer circuit operates to form a transient potential between the first and second connection terminals of the coil module and to consume electrical energy of the inductor current, for gradually stopping the motor in a buffering time period.
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: October 30, 2012
    Assignee: Sunonwealth Electric Machine Industry Co., Ltd.
    Inventors: Alex Horng, Tung-An Chen, Cheng-Nan Tsai, Kun-Tien Wu, Kuan-Yin Hou
  • Patent number: 8179084
    Abstract: A drive system for a grid blower of a vehicle is provided. The system includes: an electrical bus, a grid of resistive elements connected to the electrical bus, the grid of resistive elements configured to thermally dissipate electrical power generated from braking of the vehicle, the electrical power being transmitted on the electrical bus to the grid of resistive elements, an electrical power modulation device configured to modify electrical power received from at least one of the electrical bus and the grid of resistive elements, and a grid blower motor coupled to an output of the electrical power modulation device, wherein a speed of the grid blower motor varies based on the electrical power that has been modified by the electrical power modulation device.
    Type: Grant
    Filed: June 3, 2008
    Date of Patent: May 15, 2012
    Assignee: General Electric Company
    Inventors: Ajith Kuttannair Kumar, Bret Worden, Sudhir Kumar Gupta, Theodore Clark Brown
  • Patent number: 8084970
    Abstract: An electrical machine having a stator and a rotor. The stator includes a core and a plurality of windings disposed on the core in a multiple-phase arrangement. The rotor is disposed adjacent to the stator to interact with the stator. A method of operating the motor includes applying a pulsed voltage differential to first and second terminals of the windings resulting in movement of the rotor; monitoring the back electromotive force (BEMF) of the windings to sense rotor movement; after the applying and monitoring steps, monitoring the BEMF of the windings to determine whether the rotor is rotating in a desired direction, and electrically commutating the motor when the rotor is rotating in the desired direction and zero or more other conditions exist.
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: December 27, 2011
    Assignee: Regal Beloit EPC Inc.
    Inventors: Paul Steven Mullin, Brian Thomas Branecky
  • 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
  • Patent number: 7941972
    Abstract: A powered opening and closing system includes a door supported on a vehicle body, a motor, a drive mechanism for moving the door in opening and closing directions by virtue of power of the motor, an operation detecting sensor for detecting a handle operation when the door is operated to open or close, and a control circuit for prohibiting the operation of the drive mechanism when a predetermined operation prohibiting condition is detected. The drive mechanism brakes the movement of the door by putting the clutch in an engaged state while the motor is kept stopped. While the predetermined operation prohibiting condition is detected, the control circuit controls the clutch to be engaged while keeping the motor stopped when an opening of the door is detected, and controls the clutch to be disengaged when an operation of the handle is detected by the operation detection sensor.
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: May 17, 2011
    Assignee: Mitsui Mining & Smelting Co., Ltd.
    Inventors: Haruo Kamiya, Kenichi Iijima
  • Patent number: 7893637
    Abstract: In a drive system of an AC motor in which a motor current is feedback-controlled, a motor current command is produced in a normal operation according to a torque command value on an optimum efficiency characteristic line so as to select an optimum current phase maximizing an output torque with a constant motor current amplitude. Conversely, when the AC motor produces an excessively generated power exceeding a regeneratable power quantity of the AC motor, a consuming operation is performed for intentionally increasing the power loss in the AC motor. In the consuming operation, the motor current command is produced according to the torque command value on a loss increase characteristic line to change the current phase from the above optimum value. Thereby, the power loss in the AC motor can be increased to consume the surplus power without causing instability in the motor control.
    Type: Grant
    Filed: October 26, 2006
    Date of Patent: February 22, 2011
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masayoshi Suhama, Masaki Okamura, Eiji Sato
  • Patent number: 7723936
    Abstract: The invention relates to a method for controlled braking of an electrically powered lifting action in the event of a failure, such that at least one of the nominal values for “rotational direction” and/or “operating speed” and/or “door position” and/or “motor capacity” and/or “motor current” is ascertained and compared with an actual value, and such that a motorized braking process or motorized stopping process is triggered by a departure of the actual value from the nominal value that lies outside a predetermined range. In addition the invention relates to a device for applying said method.
    Type: Grant
    Filed: July 27, 2007
    Date of Patent: May 25, 2010
    Assignee: Feig Electronic GmbH
    Inventor: Dirk Schaefer
  • Patent number: 7615952
    Abstract: Disclosed is a motor-driving device capable of protecting an inverter from breakdown. First current-protecting section retains reference voltage value Vref1 as a preset value. If the current to be fed into inverter exceeds value Vref1, first current-protecting section shuts off the output of driver and outputs a first warning to driving-signal generator to shut off generating driving signals. This protects inverter from breakdown. Second current-protection section retains reference voltage value Vref2 that is smaller than value Vref1. If the detected current exceeds value Vref2, second current-protecting section outputs a second warning. Receiving the second warning, driving-signal generator immediately stops generating driving signals; however, it resumes output of driving signals after no longer receiving second warning. The structure above protects inverter from breakdown without frequent stops of brushless motor.
    Type: Grant
    Filed: August 24, 2005
    Date of Patent: November 10, 2009
    Assignee: Panasonic Corporation
    Inventors: Kazuhiro Harada, Chisumi Harada, legal representative
  • Publication number: 20090033256
    Abstract: A powered opening and closing system includes a door supported on a vehicle body, a motor, a drive mechanism for moving the door in opening and closing directions by virtue of power of the motor, an operation detecting sensor for detecting a handle operation when-the door is operated to open or close, and a control circuit for prohibiting the operation of the drive mechanism when a predetermined operation prohibiting condition is detected. The drive mechanism brakes the movement of the door by putting the clutch in an engaged state while the motor is kept stopped. While the predetermined operation prohibiting condition is detected, the control circuit controls the clutch to be engaged while keeping the motor stopped when an opening of the door is detected, and controls the clutch to be disengaged when an operation of the handle is detected by the operation detection sensor.
    Type: Application
    Filed: July 31, 2008
    Publication date: February 5, 2009
    Inventors: Haruo Kamiya, Kenichi Iijima
  • Patent number: 7388338
    Abstract: A device is for braking a magnetic levitation railway, wherein the stator winding of a linear motor is short-circuited as a brake winding in a last section before an end of the route. There is a provision for two stator windings which extend alternately on the stator to be present in a penultimate section.
    Type: Grant
    Filed: March 11, 2005
    Date of Patent: June 17, 2008
    Assignee: Siemens Aktiengesellschaft
    Inventors: Reinhard Hoffmann, Wolfgang Spaeth
  • Patent number: 7298107
    Abstract: A control unit for a moveable barrier, such as a garage door, includes a microcontroller connected to a motor speed detector, motor current sensor or a sensor for determining forces exerted on or by the barrier. A user interface includes user actuatable switches for setting a first maximum force value to be exerted on or by the barrier when moving in one direction and the microcontroller automatically sets the value of a second maximum force to be exerted on or by the barrier when moving in the opposite direction. The second force value may be based on the force value set by the user or the second force value may be a preset value. Both force limits may be automatically set as a function of a maximum force exerted on said barrier during movement thereof, during a force learning operation.
    Type: Grant
    Filed: February 16, 2006
    Date of Patent: November 20, 2007
    Assignee: Overhead Door Corporation
    Inventor: Michael T. McMahon
  • Patent number: 7291997
    Abstract: A motor has built therein a brake for stopping the rotation of the motor and a brake controlling circuit for controlling the brake. The motor is further provided with a bypass circuit for supplying an electric power directly to the brake and a terminal for connecting a power source to the bypass circuit. When the brake controlling circuit develops a fault, the brake is directly released by an external power source.
    Type: Grant
    Filed: November 9, 2004
    Date of Patent: November 6, 2007
    Assignee: Nissan Motor Co., Ltd.
    Inventor: Takamasa Nakamura
  • 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: 7095196
    Abstract: A vehicle driving force control apparatus is configured to prevent co-rotation of the motor caused by rotation of a pair of wheels when a clutch connecting the wheels and the motor is released (disconnected). When the clutch is released, the motor is braked by short circuiting the armature. The motor is then braked again by setting the field current of the motor to 0 when the rotational speed of the motor reaches 0. After the clutch is released, a braking-direction field current is applied to the motor in accordance with the decreasing rotational speed of the motor such that the braking force is decreased as the rotational speed of the motor decreases.
    Type: Grant
    Filed: October 8, 2004
    Date of Patent: August 22, 2006
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Hidemichi Tokunou, Satoru Chuujou, Yasuo Matsunaga
  • Patent number: 7088064
    Abstract: A method for the orientation of a spindle of a numerically controlled and rapidly rotating spindle by which the spindle is brought from an initial rotational speed into a predetermined position of rest. The method includes performing a first phase of orientation of the spindle by braking the spindle to a threshold rotational speed, wherein during the braking a switching over to a position controller is prepared, the switching over is performed at a switching time during a transition from the first phase of orientation to a second phase of orientation, the switching over is continuous in regard to position and/or rotational speed, and wherein a rotational speed of the spindle drops strictly monotonically.
    Type: Grant
    Filed: February 10, 2004
    Date of Patent: August 8, 2006
    Assignee: Dr. Johannes Heidenhain GmbH
    Inventors: Michael Brakelmann, Matthias Fauser
  • Patent number: 7019483
    Abstract: The position-controlled stopping of rotating components of shaftless drive mechanisms, in the case of a loss of voltage, is accomplished by the provision of an external connectable network. That external connectable network supplies the process power which is missing due to a loss of rotational power in the event of a voltage loss.
    Type: Grant
    Filed: April 6, 2001
    Date of Patent: March 28, 2006
    Assignee: Koenig & Bauer Aktiengesellschaft
    Inventor: Nikolaus Markert
  • Patent number: 6998804
    Abstract: A retarded electric motor designed as a series motor or an asynchronous motor having a squirrel cage rotor. A valve is provided for switching between motor operation and braking operation. During motor operation the motor is operated in a known configuration as series motor or as asynchronous motor. If configured as a series motor, the valve (S1, S2, S3) allows to bypass the armature and to operate the motor as an externally excited direct current generator when switching into braking operation. If configured as an asynchronous motor, a switch is utilized to disconnect at least two field windings from mains. A valve is utilized to excite the motor externally from mains with a pulsating direct current during braking.
    Type: Grant
    Filed: July 23, 2003
    Date of Patent: February 14, 2006
    Assignee: C. & E. Fein GmbH & Co. KG
    Inventors: Christoph Meyer, Christof Kress, Alfred Schreiber
  • Patent number: 6876163
    Abstract: A circuit for controlling a motor's operation is disclosed. The circuit includes a relay and a motor braking circuit portion. The relay selectively interconnects a voltage source with one of a braking terminal and a motor terminal. The motor braking circuit portion has a motor brake switch connected on a first switch side to the motor terminal and a second switch side to the electrical ground. The brake switch is activated to brake the motor when the relay interconnects the voltage source with the braking terminal.
    Type: Grant
    Filed: April 14, 2003
    Date of Patent: April 5, 2005
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Gary E. Zack, Charlie Richlie, Chung H. Peng
  • Patent number: 6870338
    Abstract: A small permanent magnet is affixed to the protruding portion of a rotor of a motor that is coupled to gears in a gear enclosure. The rod of a window covering is coupled to the gears such that when the motor is energized by a user command signal, the window covering moves. At least one pick-up coil is affixed to the receptacle of the gear enclosure, such that when the motor with magnet turns, the pick-up coil senses magnetic pulses that can be used to determine the speed, position, and direction of rotation of the motor.
    Type: Grant
    Filed: June 11, 2003
    Date of Patent: March 22, 2005
    Assignee: Harmonic Design, Inc.
    Inventors: Winston Glenn Walker, Norman C. Walker
  • Publication number: 20040239269
    Abstract: A movable barrier operator (10) can have at least two automatic modes of operation. These modes of operation can differ from one another at least with respect to their respective utilized maximum-applied-force thresholds, such that one of the modes of operation correlates to a reduced maximum-applied-force threshold. Selection between these available maximum-applied-force thresholds can be based, at least in part, upon whether an obstacle detector is operably coupled to the movable barrier operator. In one embodiment, a primary controller (30) and a secondary controller (31) can be utilized to effect the controlled selection and usage of the available maximum-applied-force thresholds. In another embodiment, maximum permitted speed of travel for the movable barrier can also be determined, at least in part, as a function of whether an obstacle detector is available to the movable barrier operator.
    Type: Application
    Filed: May 29, 2003
    Publication date: December 2, 2004
    Applicant: The Chamberlain Group, Inc.
    Inventors: James J. Fitzgibbon, Edward Laird
  • Patent number: 6756760
    Abstract: A motor control apparatus and a motor control method that instruct deenergization of a motor a predetermined period of time after an arrival of a subject to be driven by the motor at a speed measuring position. The predetermined period of time corresponds to a current speed of the motor upon arrival of the subject to be driven at the speed measuring position, and the speed measuring position is at a predetermined distance before a target stop position of the subject to be driven.
    Type: Grant
    Filed: May 27, 2003
    Date of Patent: June 29, 2004
    Assignee: Seiko Epson Corporation
    Inventors: Hirotomo Tanaka, Hidetoshi Kodama, Masafumi Furuyama, Toshiyuki Takahara
  • Patent number: 6737823
    Abstract: A control system for controlling the operation of an electric motor driven door or gate operator unit having a speed reducing gear drive mechanism and a brake unit for positive braking of the motor output shaft. A programmable microcontroller is operably connected to a motor drive circuit with interlock relays to energize the drive motor for rotation in opposite directions. The motor drive circuit is interconnected with a motor watchdog circuit to effect motor shutdown if the microcontroller malfunctions and a brake release circuit to prevent motor operation unless the brake is energized. The microcontroller is operable to store door mid-stop time delay values, braking rates, a door position limit overrun signal, a door cycle count, door reversals upon receiving an obstruction detector signal and error codes associated with door operator and control system malfunctions. The brake may be controlled on a variable duty cycle to provide smooth braking action in both directions of movement of the door.
    Type: Grant
    Filed: December 13, 2001
    Date of Patent: May 18, 2004
    Assignee: Overhead Door Corporation
    Inventors: Brett A. Reed, Robert E. Balli
  • Patent number: 6636010
    Abstract: A liquid dispensing system increases the precision, reliability, and safety of dispensing medications and other liquids. An electronic brake grounds a power terminal of a pump motor to absorb the kinetic energy of the motor and other mechanically coupled components. The electronic brake reduces overage and overage variation in the dispensing of liquids at very little cost or complexity. A watchdog circuit monitors a controller heartbeat signal and disables the motor in the absence of a regular beat. The watchdog circuit along with redundant power switches greatly reduce the possibility of motor runaway in the event of component failure. A controller begins or ends each dispensing cycle with a diagnostic which determines whether the liquid dispensing system is fully operational. If not, the controller may disable the motor, emit an alarm tone, and display an alarm message.
    Type: Grant
    Filed: October 1, 2001
    Date of Patent: October 21, 2003
    Assignee: Zevex, Inc.
    Inventors: James Malmstrom, David Soss
  • Publication number: 20030151383
    Abstract: A region judging circuit judges an electric angle region of a three-phase brushless DC motor based on an output signal of a resolver. A latch timing output circuit determines an optimum latch timing. A driving direction judging circuit judges a rotational direction of the motor based on a comparison in largeness between a pair of phase currents. A latch circuit latches a judgement result of the driving direction judging circuit at the latch timing designated by the latch timing output circuit and retains the judgement result until the next latch timing comes.
    Type: Application
    Filed: February 3, 2003
    Publication date: August 14, 2003
    Applicant: DENSO CORPORATION
    Inventor: Yoshitaka Hayashi
  • Patent number: 6600286
    Abstract: A motor control apparatus and a motor control method according to a first aspect of the invention are configured to instruct deenergization of a motor a predetermined period of time later than arrival of a subject to be driven by the motor at a speed measuring position. The predetermined period of time corresponds to a current speed of the motor upon arrival of the subject to be driven at the speed measuring position, and the speed measuring position is at a predetermined distance before a target stop position of the subject to be driven.
    Type: Grant
    Filed: March 2, 2001
    Date of Patent: July 29, 2003
    Assignee: Seiko Epson Corporation
    Inventors: Hirotomo Tanaka, Hidetoshi Kodama, Masafumi Furuyama, Toshiyuki Takahara
  • Patent number: 6448727
    Abstract: A mains braking device for a line-powered power tool includes a circuit arrangement with a two-pole switch which switches between the motor mode and the braking mode. The inventive braking device further includes an electronic power circuit breaker or triac which is connected in series to the commutator motor of the power tool and with control electronics allocated to the triac. For the safe recognition and initiation of the mains braking mode, the control electronics is provided with devices for differentiating between the motor mode and the mains braking mode. The mains braking device is especially useful for power tools such as right angle grinders, hand-held buzz saws and the like which are provided with dangerous tools.
    Type: Grant
    Filed: June 29, 2001
    Date of Patent: September 10, 2002
    Assignee: Metabowerke GmbH
    Inventor: Hans Hermann Rotterhusen
  • Patent number: 6348771
    Abstract: The present invention provides a motor drive controller for a vehicle having an engine and a motor disposed therein as a vehicle-propulsion system, the motor having both driving and power-generating functions, comprising: an engine controller for controlling a running state of the engine; motor controller for controlling both driving and power-generating states of the motor in a manner independent of control over the engine gained by the engine controller; engine speed-detector for detecting an engine revolution of the engine; and, engine load-detector for detecting an engine load. The motor controller includes a map defined by respective detection signals from the engine speed detector and the engine load-detector. The motor controller functions to provide alternative control between driving and power generation of the motor in response to a torque instruction value that is retrieved from the map.
    Type: Grant
    Filed: March 30, 2000
    Date of Patent: February 19, 2002
    Assignee: Suzuki Motor Corporation
    Inventors: Kazuhiko Morimoto, Yoshiaki Omata
  • Patent number: 6291952
    Abstract: Electric motors, in particular geared motors, are often equipped with electromagnetically actuated mechanical brakes. In order to ensure that an excitation coil (3) can be operated with alternating-current mains supplies of various voltages, it is proposed to generate a unipolar voltage that varies over time with a certain period by means of a voltage source (2), the output voltage of which is positive and different from zero in a first time segment of this voltage period and in this first time segment has a maximal value, and in a second segment of the voltage period is zero or approaches zero. To pass an excitation current from the voltage source (2) to the excitation coil (3), a current path (15) is provided that is opened substantially at the beginning of the first time segment. The current path (15) is blocked again at a certain point within the first time segment, this point being selected such that the excitation current does not exceed a predetermined maximal value.
    Type: Grant
    Filed: April 28, 2000
    Date of Patent: September 18, 2001
    Assignee: Sew-Eurodrive GmbH & Co.
    Inventors: Jörg Roth-Stielow, Josef Schmidt
  • 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: 6072292
    Abstract: A number of embodiments of electric motor controls for electric power assisted vehicles. The controls all provide for regenerative braking to be automatically enabled upon the sensing of a failure in the control system. The regenerative braking is, however, discontinued once the vehicle stops so that it can be easily pushed by hand without drag from the electric motor.
    Type: Grant
    Filed: March 13, 1998
    Date of Patent: June 6, 2000
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Atsushi Uchiyama, Hiroshi Tanaka
  • Patent number: 5917297
    Abstract: The arrangement or apparatus for operating a magnetically suspended, electromotoric drive apparatus in the event of a mains disturbance comprises a drive converter feeding the drive apparatus, a driver feeding a magnetic bearing and a voltage converter, which are connected to a common intermediate circuit. The voltage converter feeds a stopping control apparatus and the drive converter can be switched to a regeneratively acting mode of operation by the stopping control apparatus in the event of a mains disturbance in order to provide at least the driver feeding the magnetic bearing and the stopping control apparatus with electrical energy via the intermediate circuit.
    Type: Grant
    Filed: July 9, 1997
    Date of Patent: June 29, 1999
    Assignees: Lust Antriebstechnik GmbH, Sulzer Electronics AG
    Inventors: Christian Gerster, Reto Schob, Thomas Gempp
  • Patent number: 5894204
    Abstract: A spindle motor control method stops a spindle motor which rotates in a forward direction in response to a rotation signal. The spindle motor control method includes two steps. First, a brake signal is supplied to the spindle motor for rotating the spindle motor in a reverse direction when stopping the spindle motor which rotates in the forward direction. Second, the rotation signal and the brake signal are put in an OFF state when a frequency generator signal FG, which indicates a rotational phase of the spindle motor and is generated based on an output of the spindle motor, is not detected for a predetermined time.
    Type: Grant
    Filed: February 12, 1998
    Date of Patent: April 13, 1999
    Assignee: Fujitsu Limited
    Inventor: Hiroshi Kumita
  • Patent number: 5828195
    Abstract: Apparatus for braking either a linear or rotary electric motor having no permanent magnets comprising at least one position sensor for outputting an electrical characteristic representative of motor position and an electronic circuit for generating a pulsed control signal for controlling the braking of the motor. The electronic circuit of the present invention may be responsive to any emergency such as loss of line power, a motion controller failure, or actuation of a limit switch by a driven member.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: October 27, 1998
    Assignee: Universal Instruments Corporation
    Inventor: Andrew Zalesski
  • 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: 5734241
    Abstract: A brushless motor includes a stationary member; a rotating member rotatably supported with respect to the stationary member; a stator provided in the stationary member and provided with a stator coil for generating current magnetic field under an exciting state; and a rotor magnet provided in the rotating member for obtaining a revolutionary power due to an electromagnetic mutual effect with the current magnet field of the stator coil. The rotor magnet is formed such that segment-shaped magnets are placed annularly with predetermined gaps circumferentially. The gaps are filled with a magnetic resin material.
    Type: Grant
    Filed: July 25, 1996
    Date of Patent: March 31, 1998
    Assignee: Nidec Corporation
    Inventors: Tadashi Okada, Akira Inui
  • Patent number: 5710494
    Abstract: A single-motor drive for an open-end spinning machine, the motor being in the form of an axial field motor with a magnet/gas bearing supporting the rotor with a gas cushion, includes a gas monitoring arrangement which will detect a disruption in the gas supply, and responsive to the gas disruption, a device for braking the rotor is connected with the circuit via a switch. The braking device, which includes a ballast resistor, is set for reducing the rotational speed of the rotor in a manner whereby when the rotor bearing surface lands on the stator bearing surface due to the collapse of the air cushion, its rotational speed is less than that which would result in damage to the bearing surfaces.
    Type: Grant
    Filed: June 14, 1995
    Date of Patent: January 20, 1998
    Assignee: SKF Textilmaschinen-Komponenten GmbH
    Inventor: Anton Paweletz
  • Patent number: 5596251
    Abstract: A system for cutting molten plastic material for compression molding includes a rotary-driven cutter mounted in operative association with an extruder which supplies molten plastic. The cutter is driven by a servo motor, the operation of which is coordinated with an associated rotary carousel on which cavities are successively presented to the cutter apparatus. In order to effect separation of each cut discrete quantity of plastic material from the cutting blade of the cutter apparatus, the servo motor is operated to create a period of distinct deceleration during each rotary cutting cycle, thereby effecting separation of the molten plastic from the surface of the cutting blade. The electronic controls of the apparatus further operate to permit the speed at which plastic cutting takes place to be controlled independently of the speed of the associated rotary carousel, while coordinating each cutting cycle with successive presentation of the cavities by the rotary carousel.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: January 21, 1997
    Assignee: Alcoa Closure Systems International, Inc.
    Inventor: Peter S. Miller
  • Patent number: 5331263
    Abstract: A velocity control device is disclosed having feedforward signal applied to a velocity servo loop. An actuator moves a laser beam spot to a desired track of an optical disk. A displacement of the laser beam spot outputted from the actuator is differentiated by a differentiator and converted to a signal corresponding to the velocity of the movement of the laser beam spot. A signal corresponding to a distance from the present position of the laser beam spot to the desired track is obtained from the displacement and a desired count value, and is inputted to a function generator to thus obtain a square root of the distance. The difference between the square root of the distance and the moving velocity is obtained by a substracter, and a feedforward signal is added to the difference. The feedforward signal is obtained by differentiating a velocity profile with respect to time with a differentiator.
    Type: Grant
    Filed: June 26, 1992
    Date of Patent: July 19, 1994
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventors: Koji Sagae, Tomoyukui Shirai
  • Patent number: 5327055
    Abstract: An automated tape library employing a motorized robotic picker wherein the electric motor driving the robotic picker is equipped with two brakes that act simultaneously. The first is a mechanical brake which uses a spring to push a fixed brake pad against the rotating motor. During normal motor operation, an electric solenoid is used to overcome the spring and disengage the brake pad from the motor. When the robotic picker is to be mechanically stopped, the solenoid voltage is turned off and the solenoid releases the spring placing the brake pad in contact with the motor. The second brake is a dynamic electrical brake which makes use of the back emf of the motor to drive a current back into its own windings such that the motor decelerates. The circuit further prevents mechanical brake engagement even at lower motor speeds when back emf is relatively low but robot speed is fast enough to cause mechanical damage if stopped via the mechanical brake.
    Type: Grant
    Filed: March 8, 1993
    Date of Patent: July 5, 1994
    Assignee: International Business Machines Corporation
    Inventors: Craig T. Danielson, Michael P. McIntosh, Hector E. Mery
  • Patent number: 4965847
    Abstract: An adjustable frequency motor drive system for a hoist is disclosed in which the frequency of the power supply to the motor can be selectively varied and the speed of the motor will follow the varying frequency at a slip speed relative to the frequency. The slip speed of the motor may not exceed a value beyond which the motor can control the hoist load. Accordingly, a frequency value based on the frequency of the power supply to the motor is selected as the frequency which is not to be exceeded by the motor speed expressed as a frequency. Signals representative of the actual motor speed and the selected frequency value are compared and, if the signal representative of the motor speed exceeds the signal representative of the frequency value which is not to be exceeded, an output signal is produced which may be used to apply a brake which stops and holds the motor and hoist and thereby maintains the load suspended.
    Type: Grant
    Filed: January 31, 1989
    Date of Patent: October 23, 1990
    Assignees: Harnischfeger Corporation, Yaskawa Electric Mfg. Co. Ltd.
    Inventors: Keith O. Jurkowski, David C. Wycoff
  • Patent number: 4338552
    Abstract: A reversible d-c motor, driving a load such as a vehicular radio antenna, has its armature winding connected in a transistorized energizing circuit which is activated by a start circuit and locks operated as long as the motor speed surpasses a certain threshold, i.e. until a major obstacle or a terminal position is encountered. The threshold may be determined by a voltage sensor detecting the counter-e.m.f. induced in the armature winding, by a Hall-effect device in the magnetic field of the stator, or by a speed sensor. The armature winding lies in series with a current limiter which determines the maximum torque applied to the load and may also transmit a no-load signal to a protective circuit when the motor is found idling, the protective circuit including a timer which cuts off the motor after a predetermined idling period. Alternatively, the operating period may be determined by a pulse counter de-energizing the motor after a preferably settable number of rotor revolutions.
    Type: Grant
    Filed: May 28, 1980
    Date of Patent: July 6, 1982
    Assignee: Richard Hirschmann, Radiotechnisches Werk
    Inventors: Karl-Heinz Pilz, Wolfgang Grater, Hans-Dietrich Mayer