Dynamic Braking Patents (Class 318/759)
  • Patent number: 11056947
    Abstract: In order to increase the operational safety of an actuator (1) including an electric motor (2) and a transmission, preferably a non-self-locking transmission (3), a braking device is provided which allows the controlled, self-actuating displacement, by a retarding brake (5), of an actuating element connected to the actuator (1) via the transmission (3). The actuating element can be held in a fixed position by an additional holding device (6), even if the electric motor (2) fails. The actuator can be used to drive heavy sluice gates, in the event of a power failure, in a controlled free-fall operation at a constant rate of fall, or to hold them in a defined position. The holding device and the retarding brake can be combined in a common housing (11) to form a braking module (12) which can be designed to be used modularly with existing motor actuators and transmissions.
    Type: Grant
    Filed: April 6, 2018
    Date of Patent: July 6, 2021
    Assignee: AUMA Riester GmbH & Co. KG
    Inventors: Benjamin Hofmann, Robert Hofmann, Rudolf Bachert
  • Patent number: 11018608
    Abstract: A self-propelled endoscope apparatus includes a rotation body, a motor, a drive circuit, and a regeneration protection circuit. The rotation body is provided on an outer peripheral surface of an elongated insertion section. The rotation body is configured to be rotatable. The motor rotates the rotation body. The drive circuit drives the motor. The regeneration protection circuit performs protecting operation for protecting the drive circuit from regeneration voltage generated by regeneration of the motor.
    Type: Grant
    Filed: January 7, 2020
    Date of Patent: May 25, 2021
    Assignee: OLYMPUS CORPORATION
    Inventors: Yoshitaka Umemoto, Takashi Suzuki, Fumiyuki Onoda, Takashi Yamashita, Yasuaki Natori
  • Patent number: 10710568
    Abstract: An apparatus is described that receives a brake control signal from the brake controller of a tow vehicle, and displays characteristics of that brake control signal including commanded brake force. The apparatus includes a data processor, brake simulation circuitry, brake integration circuitry, and display circuitry. The brake simulation circuitry sequentially applies several parallel resistors to the brake control signal in response to commands received from the data processor. These parallel resistors cause the load current on the brake controller to ramp up, mimicking the electrical signature of electric trailer brakes. At the same time, the brake integration circuitry integrates the brake control signal. Lastly, the display circuitry displays an indication of a value of the integrated brake control signal.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: July 14, 2020
    Inventors: Ian R. Vinci, Peter Vinci
  • Patent number: 10447172
    Abstract: A power regenerative converter, includes: a power module configured to include rectifiers and regenerative switches; a smoothing capacitor connected to direct-current power supply terminals, and that accumulates direct-current power during an alternating-current to direct-current conversion; a bus current detector that detects a bus current flowing between either of the direct-current power supply terminals and the smoothing capacitor; a power supply phase detector that detects a phase of an input power supply; a base drive signal generator that generates base drive signals that perform ON/OFF control of the regenerative switching elements based on a power supply phase detected by the power supply phase detection unit; a regeneration controller that performs a start and stop process of a power regenerative operation based on a detection result of the bus current detector and the base drive signals; and an overload detector that detects overload of a power regenerative converter based on the detection result o
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: October 15, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshitomo Hayashi, Yoji Tsutsumishita, Masaya Harakawa, Yuji Nojiri
  • Patent number: 10196052
    Abstract: An apparatus is described that receives a brake control signal from the brake controller of a tow vehicle, and displays characteristics of that brake control signal including commanded brake force. The apparatus includes a data processor, brake simulation circuitry, brake integration circuitry, and display circuitry. The brake simulation circuitry sequentially applies several parallel resistors to the brake control signal in response to commands received from the data processor. These parallel resistors cause the load current on the brake controller to ramp up, mimicking the electrical signature of electric trailer brakes. At the same time, the brake integration circuitry integrates the brake control signal. Lastly, the display circuitry displays an indication of a value of the integrated brake control signal.
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: February 5, 2019
    Inventors: Ian R. Vinci, Peter Vinci
  • Patent number: 10110113
    Abstract: An active filter is connected in parallel to a rectifier circuit between a set of AC input lines and a pair of DC buses. The active filter includes a capacitor, a pair of current limiting elements and an inverter. One in the current limiting elements is disposed between one end of the capacitor and one in the DC buses. Other in the current limiting elements is disposed between other end of the capacitor and other in the DC buses. At least one of the current limiting elements is disposed in an orientation to be forward with respect to a DC voltage outputted by the rectifier circuit. The inverter includes: a set of AC-side terminals connected to the set of AC input lines; and a pair of DC-side terminals connected to both ends of the capacitor.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: October 23, 2018
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Reiji Kawashima, Takayuki Fujita
  • Patent number: 10033310
    Abstract: A drive control device for a motor includes an input terminal, an output terminal, an inverter circuit, a first switch unit, a capacitor, a diode, a rectifier circuit, a photo coupler, a second switch unit, and a voltage detector. The inverter circuit converts a direct current voltage into an alternating current voltage, and outputs the alternating current voltage to the output terminal. The first switch unit shorts the output terminal based on a control signal. The capacitor is connected to the input terminal, and is charged by a direct current voltage. The diode is connected between the input terminal and the capacitor. The diode limits a direction where a charge current for charging the capacitor flows. The rectifier circuit rectifies an induced voltage, which is generated in the motor, and outputs a rectified voltage. The photo coupler converts the rectified voltage into an optical signal, and thereafter, converts the optical signal into a converted signal.
    Type: Grant
    Filed: June 15, 2017
    Date of Patent: July 24, 2018
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventor: Takaaki Gyoten
  • Patent number: 10003295
    Abstract: An inverter control device for controlling a rotating electric machine drive device that drives an alternating current rotating electric machine and includes an inverter and a DC link capacitor, the inverter being connected to a DC power supply via a contactor, being connected to the rotating electric machine, and performing power conversion between direct current and three-phase alternating current, the DC link capacitor smoothing a DC link voltage, which is a DC-side voltage of the inverter, and the inverter control device performing switching control on switching elements that form the inverter.
    Type: Grant
    Filed: March 18, 2015
    Date of Patent: June 19, 2018
    Assignee: AISIN AW CO., LTD.
    Inventors: Subrata Saha, Arinori Shimada
  • Patent number: 9647596
    Abstract: A motor control system powered by an input power source. The system includes a reactive power reducing input power system in electrical communication with a motor and a constant frequency input power source. The reactive power reducing input power system includes an AC-DC converter and a regulator system, wherein the regulator system is in electrical communication with a DC-AC inverter that is in electrical communication with the motor. The system may include an isolation system to electrically isolate the DC-AC inverter from the motor when the DC-AC inverter is not transmitting power to the motor. The system may accept multiple alternating current voltage sources including both single phase and three phase sources.
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: May 9, 2017
    Assignee: SKY CLIMBER LLC
    Inventors: James Bonanno, Robert E. Eddy
  • Patent number: 9548605
    Abstract: An assembly includes an electrical machine connected to a power converter by a three-phase circuit having three conductors, e.g. cables Each conductor is associated with a switching device such as a contactor or the like that connects the conductor to a common conductor or terminal. In the event of a fault current being developed in the circuit or the power converter the switching devices are operated to close the fault current and connect together the conductors of the three-phase circuit to provide a full three-phase short circuit.
    Type: Grant
    Filed: March 14, 2011
    Date of Patent: January 17, 2017
    Assignee: GE ENERGY POWER CONVERSION TECHNOLOGY LTD.
    Inventor: Eric Anthony Lewis
  • Patent number: 9431818
    Abstract: An assembly includes an electrical machine connected to a power converter by a three-phase circuit having three conductors, e.g. cables Each conductor is associated with a switching device such as a contactor or the like that connects the conductor to a common conductor or terminal. In the event of a fault current being developed in the circuit or the power converter the switching devices are operated to close the fault current and connect together the conductors of the three-phase circuit to provide a full three-phase short circuit.
    Type: Grant
    Filed: March 14, 2011
    Date of Patent: August 30, 2016
    Assignee: GE Energy Power Conversion Technology, LTD.
    Inventor: Eric Anthony Lewis
  • Patent number: 9413163
    Abstract: A motor control circuit includes a processor configured to calculate a plurality of motor impedances from measurements of an excitation voltage on a power bus to a motor and measurements of a plurality of currents through the motor resulting from the excitation voltage, and the processor configured to calculate individual winding inductances in the motor, based on the measured motor impedances, and configured to determine whether there is an inter-turn winding fault based on the calculated individual winding inductances.
    Type: Grant
    Filed: June 19, 2014
    Date of Patent: August 9, 2016
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Stephen John Fedigan, Sandun Shivantha Kuruppu, Paul LeRoy Brohlin
  • Patent number: 9180971
    Abstract: The ventilation device according to the invention includes a fan and an inverter. The fan comprises a rotary electrical machine and a wheel for setting an air flow into motion, integral with the rotary machine to set it in rotation. The inverter is connected to the rotary machine and, in one motor power mode of the ventilation device, is suitable for forming the supply current of the rotary machine. The inverter is suitable for being connected to a power supply network. The inverter is reversible and is, in a generating mode of the ventilation device, suitable for converting the electrical energy supplied by the rotary machine when it is driven mechanically by the wheel and injecting said converted electrical energy into the power supply network.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: November 10, 2015
    Assignees: AIRBUS OPERATIONS, TECHNOFAN
    Inventor: Olivier Darnis
  • Patent number: 9172321
    Abstract: An electrical yaw drive for a wind turbine is described, wherein the wind turbine includes a wind turbine nacelle and a wind turbine tower. The electrical yaw drive has an asynchronous motor, an excitation capacitor bank and dump loads, wherein the excitation capacitor bank and the dump loads are electrically connectable to windings of the asynchronous motor. Furthermore, a wind turbine with such an electrical yaw drive and a method for operating such a wind turbine are described.
    Type: Grant
    Filed: March 6, 2013
    Date of Patent: October 27, 2015
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Jan Thisted, Soeren Vinther
  • Patent number: 9148042
    Abstract: A system for detecting a mismatch between how a motor drive is connected electrically and how it is configured for operation is disclosed. The motor drive may either be connected in a stand-alone mode to control operation of a motor from an AC source without connection to another motor drive or be connected electrically to other motor drives, for example, in a paralleled mode, shared DC bus mode, or a combination thereof. A parameter identifies the expected electrical configuration of the motor drive. The power transferred to the DC bus is compared to the power transferred from the DC bus in the motor drive. If the difference between the power transferred to the DC bus and the power transferred from the DC bus exceeds a predetermined threshold, the motor drive detects the mismatch between how a motor drive is connected electrically and how it is configured for operation.
    Type: Grant
    Filed: October 1, 2013
    Date of Patent: September 29, 2015
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Nisha Chandrasekharan, Gerry Nagel, Arun K. Guru, Ryan Jwanouskos
  • Patent number: 9024550
    Abstract: For an electric motor used as a generator in an electric vehicle for dynamic braking, employing a dynamic reconfiguration-switching of motor windings upon the generator exceeding one of a maximum usable constraint of a first rechargeable battery in order to reduce a voltage constant of the electric motor thereby limiting one of a produced voltage and a produced power.
    Type: Grant
    Filed: March 1, 2013
    Date of Patent: May 5, 2015
    Assignee: International Business Machines Corporation
    Inventors: Tara Astigarraga, Allen K. Bates, Nhan X. Bui, Louie A. Dickens, Reed A. Hancock, Stephen L. Schwartz, Michael E. Starling, Daniel J. Winarski
  • Patent number: 9013124
    Abstract: A method is provided. A command to correspond to a target speed of a motor is received. A rotational speed of the motor is measured, and a brake-to-off ratio for a braking interval is calculated based at least in part on the rotation speed, the target speed, a braking parameter. An off state for an inverter that is coupled to motor is induced during an off portion of the braking interval, and a brake signal is applied to the inverter during a braking portion of the braking interval.
    Type: Grant
    Filed: February 14, 2012
    Date of Patent: April 21, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Kazunori Itoh, Yasushi Kitamura
  • Patent number: 8952648
    Abstract: A method of braking a washing machine from an operational speed to a zero speed is provided (as well as a washing machine incorporating the method) for a washing machine driven by one of a synchronous or asynchronous motor. Upon receipt of a stop signal, collapsing the motor rotating magnetic fields are collapsed for a predefined time period. After the predefined time period, DC braking voltage is applied to the motor stator windings at a controlled ramp-up rate to a fixed amplitude to generate a controlled ramped braking torque on the motor. The braking torque is applied until the motor is stopped.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: February 10, 2015
    Assignee: General Electric Company
    Inventors: Richard Dean Suel, II, John Steven Holmes, Meher Prasadu Kollipara, Mariano Pablo Filippa, Shyam Sunder Ramamurthy
  • Patent number: 8937449
    Abstract: An apparatus and method for drastically increasing the efficiency of a single phase AC motor. A DC solid state driver is used to pulse a combination of the motor coil and a series capacitor. The coil/capacitor combination allows the motor to run near resonance (or a multiple of resonance). This results in a flywheel effect that only requires pulses at the proper time to keep it going. The solid state driver is powered by pulsed DC at around 150 volts peak and clocked at 60 Hz by a square wave timing circuit.
    Type: Grant
    Filed: August 13, 2012
    Date of Patent: January 20, 2015
    Inventor: Larry G. Seever
  • Patent number: 8907599
    Abstract: An electric brake device is provided for electronically controlled synchronous motors which are supplied with voltage by way of a converter. The synchronous motor contains a winding center point and that the winding center point is connected by way of an electric resistor and a switch to a ground point of the converter and that the phases of the converter that are connected to the ground point contain in each case a free-wheeling diode.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: December 9, 2014
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Kubilay Koral, Michael Krueger
  • Patent number: 8886433
    Abstract: An electric braking control apparatus for controlling an electric braking apparatus which includes a brake pad, a motor which generates a rotational torque, and a rotation/linear motion conversion mechanism which causes the brake pad to generate a pressing force based on the torque. The braking control apparatus includes an inverter which converts and outputs an electric current supplied from a power supply to the motor, and a microcomputer that receives power from the power supply, detects the value of a voltage applied from the power supply to the inverter, and controls the electric current output from the inverter depending on a result of the detection.
    Type: Grant
    Filed: October 22, 2007
    Date of Patent: November 11, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Yasufumi Konishi, Toshiyuki Innami, Satoru Kuragaki, Takafumi Suzuki
  • Patent number: 8339142
    Abstract: In an abnormality diagnosing system for first and second current sensors for measuring a current, an obtaining unit obtains at least one pair of measured values of the first and second current sensors. The at least one pair of measured values is measured by the first and second current sensors at a substantially same timing. A diagnosing unit diagnoses whether there is an abnormality in at least one of the first and second current sensors based on a function defining a relationship between the at least one pair of measured values of the first and second current sensors.
    Type: Grant
    Filed: January 21, 2011
    Date of Patent: December 25, 2012
    Assignee: Denso Corporation
    Inventor: Takahumi Oowada
  • Patent number: 8310102
    Abstract: A multilevel inverter is provided. The multilevel inverter includes a plurality of bridges, each bridge configured to receive a respective portion of an input DC power and convert the respective portion to a respective converted AC power. The multilevel inverter also includes at least one bridge controller for operating at least one of the plurality of bridges in a square waveform mode. The multilevel inverter further includes a plurality of transformers, each transformer coupled to a respective bridge and configured to increase a voltage level of the respective portion of converted AC power. The plurality of transformers further includes secondary windings coupled in series with the other secondary windings to combine the respective increased voltage level portions of the converted AC power. The multilevel inverter also includes a grid converter configured to provide output power for a power grid.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: November 13, 2012
    Assignee: General Electric Company
    Inventor: Ravisekhar Nadimpalli Raju
  • 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: 8207700
    Abstract: The invention relates to a switch arrangement of an electric motor drive (1). The electric motor drive comprises safety switches (3) determined by the safety of the drive, a controlled mechanical brake (4), a power supply circuit (5) of the brake control, a power converter (6), which power converter comprises a network rectifier (7) and a power rectifier (8) of the motor. The power rectifier of the motor is at least partly implemented with controlled semiconductor switches (9, 10) arranged into a bridge. The power converter comprises an intermediate circuit (11, 12) between the network rectifier and the power rectifier of the motor. The switch arrangement comprises normally-open switches (13, 14) in the intermediate circuit of the power converter (6).
    Type: Grant
    Filed: January 25, 2010
    Date of Patent: June 26, 2012
    Assignee: Kone Corporation
    Inventors: Timo Syrman, Ari Kattainen
  • Patent number: 8188701
    Abstract: There are provided a smoothing capacitor (71) for storing an induced electromotive force generated by a three-phase induction motor (5), a regenerative transistor (81 to 86) for switching a terminal voltage of the smoothing capacitor to carry out a power regenerating operation over a three-phase AC power supply (3), a line voltage detecting portion (6) for detecting a line voltage of the three-phase AC power supply, a fundamental waveform generating portion (10) for generating, from a signal output from the line voltage detecting portion, a fundamental waveform defined to be a line voltage waveform of the three-phase AC power supply in which a source voltage distortion component is not mixed, a base driving signal creating portion (7) for creating a base driving signal to be used for an ON/OFF control of the regenerative transistor based on a signal output from the fundamental waveform generating portion, and a base driving signal output portion (9) for outputting the base driving signal.
    Type: Grant
    Filed: April 10, 2007
    Date of Patent: May 29, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshitomo Hayashi, Akihiko Iwata
  • Publication number: 20120086383
    Abstract: A system to control an asynchronous tri-phase motor where said system comprises: at least one filter directly coupled to the current of the Alternative Current (AC) line; a rectifier which rectifies the line current, a doubler which reduces the curl, elevates the voltage and delivers a voltage in Direct Current, a braking resistance which helps to dissipate energy when the system is in braking mode, a shunt resistance, which helps to measure the current which flows from the V-line between the doubler and the IGBT module, a source, which adapts the voltage which the microcontroller consumes and peripheries (operational amplifiers, detectors, etc.
    Type: Application
    Filed: October 11, 2011
    Publication date: April 12, 2012
    Inventors: Omar Antonio Hernandez Ferrusca, Alfredo Diaz Fernandez
  • Patent number: 8125176
    Abstract: The invention relates to a motorized system for closing a building, of the roller shutter type with the particular feature that it has a two-phase asynchronous motor which comprises two windings (2; 3) and is combined with a speed-varying device (5).
    Type: Grant
    Filed: April 25, 2007
    Date of Patent: February 28, 2012
    Assignee: Bubendorff
    Inventors: Olivier Walti, Nils Casteras
  • Patent number: 7902779
    Abstract: A system and method for limiting input voltage to a power delivery system having regeneration capability. According to various embodiments, the system includes a regulator having a multiple input variables and at least one output variable; and an accumulator in communication with the regulator wherein the accumulator presets the output of the regulator to facilitate a quick output as well as accumulates error values related to the multiple input variables and facilitates a change by the regulator to the at least one output variable based upon the accumulated values.
    Type: Grant
    Filed: July 3, 2008
    Date of Patent: March 8, 2011
    Assignee: Siemens Industry, Inc.
    Inventors: John Channing Bousfield, III, Xuan Zhang, Ronald Gaillot
  • Patent number: 7898208
    Abstract: A boost converter boosts a DC voltage of a DC power supply. An inverter converts the output voltage of the boost converter into an AC voltage. A control device that controls the boost converter reduces an output voltage instruction value of the boost converter when the rotation speed of the AC motor decreases and an absolute value of a variation rate of the rotation speed is not less than a predetermined value. The inverter is controlled in the control mode selected from a plurality of control modes including three modes of a sine wave PWM control mode, an overmodulation PWM control mode and a rectangular wave control mode. The control device of the boost converter reduces the output voltage instruction value of the boost converter only when the control mode of the inverter is the rectangular wave control mode or the overmodulation control mode.
    Type: Grant
    Filed: November 1, 2006
    Date of Patent: March 1, 2011
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kiyoe Ochiai, Masaki Okamura, Hiroyuki Oyanagi
  • Patent number: 7733615
    Abstract: A dynamic braking load analyzer that determines the proper resistance value for a dynamic braking load resistor to be used in combination with a variable frequency drive or servo-drive to accommodate the power dissipated from an induction motor when it is being reduced in speed. The analyzer includes a resistor bank having a plurality of resistors electrically coupled in parallel. Switches are provided between the resistors, and a resistor selector switch determines which resistors are switched into the resistor bank circuit. A heat sensing resistor in the resistor bank measures the heat generated by the resistors and provides a signal that is read by a heat meter. The combination of the temperature measurement and the resistance of the resistors in the circuit gives the proper braking resistance value for the deceleration of the induction motor.
    Type: Grant
    Filed: April 30, 2008
    Date of Patent: June 8, 2010
    Assignee: Powerohm Resistors, Inc.
    Inventors: Joseph S. Eschleman, Thomas Yingling, Michael Crowe
  • Publication number: 20100052598
    Abstract: There are provided a smoothing capacitor (71) for storing an induced electromotive force generated by a three-phase induction motor (5), a regenerative transistor (81 to 86) for switching a terminal voltage of the smoothing capacitor to carry out a power regenerating operation over a three-phase AC power supply (3), a line voltage detecting portion (6) for detecting a line voltage of the three-phase AC power supply, a fundamental waveform generating portion (10) for generating, from a signal output from the line voltage detecting portion, a fundamental waveform defined to be a line voltage waveform of the three-phase AC power supply in which a source voltage distortion component is not mixed, a base driving signal creating portion (7) for creating a base driving signal to be used for an ON/OFF control of the regenerative transistor based on a signal output from the fundamental waveform generating portion, and a base driving signal output portion (9) for outputting the base driving signal.
    Type: Application
    Filed: April 10, 2007
    Publication date: March 4, 2010
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yoshitomo Hayashi, Akihiko Iwata
  • Patent number: 7567044
    Abstract: A braking device for an electrically driven rotor comprises a drive signal generating circuit for an electrically driven rotor, an output stage, a motor for the electrically driven rotor, driven by the output stage, and a monitor circuit for detecting interruption of an electric power supply for the motor. The output stage has a MOSFET of an upper stage side and a MOSFET of a lower side, and a diode inserted between a gate of the MOSFET of the lower stage side and the electric power supply. An electromagnetic brake is generated and applied on the electrically driven rotor when the MOSFET of the upper stage side is turned OFF and the MOSFET of the lower stage side is turned ON by a control signal from the monitor circuit, and an exciter coil of the motor is shorted when the electric power supply is interrupted.
    Type: Grant
    Filed: March 21, 2007
    Date of Patent: July 28, 2009
    Assignee: Japan Servo Co., Ltd.
    Inventor: Shuichi Matsuhashi
  • Publication number: 20090167236
    Abstract: A control apparatus for an AC rotary machine, comprising a VVVF inverter 1 which exchanges electric power between it and the AC rotary machine, a voltage detector 16 which detects voltage information of a DC side of the inverter 1, current detectors 3 which detect current information items of an AC side of the inverter 1, an inverter-electric-power command unit 20 which determines an inverter-electric-power command value in accordance with the detected voltage information, an actual-inverter-electric-power calculation unit 19 which calculates an actual inverter-electric-power value on the basis of the detected current information items, a secondary-magnetic-flux command calculation unit 18 which calculates a secondary-magnetic-flux command value for the AC rotary machine, on the basis of a difference between the inverter-electric-power command value and the actual inverter-electric-power value, a-predetermined-secondary-magnetic-flux command unit 23 which outputs a predetermined secondary-magnetic-flux comman
    Type: Application
    Filed: May 25, 2006
    Publication date: July 2, 2009
    Applicant: Mitsubishi Electric Corporation
    Inventors: Masaki Kono, Hiroyuki Kayano, Tsuneyasu Kakizaki
  • Patent number: 7521889
    Abstract: In a DC braking method for stopping an induction motor, torque shock generated by an abrupt change of an output current phase is reduced to a predetermined value or less when a switch-over from a normal control state to a DC braking state. When a switch-over from a normal control state to a DC control state is performed, the generated torque shock is reduced to a predetermined value or less is provided. In this case, an abrupt change of an output voltage phase is inhibited by predictably operating the output voltage phase during the DC braking to control the power converter on the basis of a setup DC braking initiation frequency or a phase advanced until the DC braking is initiated, which is predetermined by a deceleration rate and the setup DC braking initiation frequency and the output voltage phase of a normal control state at the instant that a switch-over to the DC braking state is performed.
    Type: Grant
    Filed: February 14, 2005
    Date of Patent: April 21, 2009
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Hideaki Iura, Shigekazu Nakamura
  • Patent number: 7508147
    Abstract: An electrical device includes a plurality of single-phase power cells electrically connected to receive power from a source and deliver power to a load. The single-phase power cells include a first rank of regenerative power cells and a second rank of non-regenerative power cells. Each non-regenerative power cell may include an inverter bridge, a capacitor set electrically connected across terminals of the inverter bridge, and a three-phase bridge rectifier electrically connected across the terminals. The non-regenerative power cells may provide reactive power when the plurality of cells are used for braking of a motor.
    Type: Grant
    Filed: May 18, 2006
    Date of Patent: March 24, 2009
    Assignee: Siemens Energy & Automation, Inc.
    Inventors: Mukul Rastogi, Richard H. Osman, Yusuke Fukuta
  • Patent number: 7408312
    Abstract: A control device for a permanent magnet synchronous motor includes: an inverter 9 for converting inputted DC voltage into AC voltage of variable-voltage and variable-frequency, and driving a motor 14 with the AC voltage; a speed controller 22 for generating, in accordance with a speed instruction signal, a q-axis current component orthogonal to the magnetic field of the motor 14; a loss calculating means 50 for calculating a loss by summing a copper loss and an iron loss in the motor 14; a d-axis current generating means 52 for generating, in accordance with the value that is the motor's rated loss decreased by the loss, a d-axis current instruction signal to flow into the motor 14; and a resistor-on-judgment unit 58 for judging, from the DC voltage, whether or not the motor 14 operates in its recovery state and activating the d-axis current generator 52 while in the recovery state.
    Type: Grant
    Filed: March 24, 2004
    Date of Patent: August 5, 2008
    Assignee: Mitsubishi Electric Corporation
    Inventors: Nobuo Itou, Keita Horii
  • Patent number: 7368889
    Abstract: A motor control apparatus supplying AC power to a motor having a plurality of motor windings having an inverting part including a bridge circuit having a plurality of switching units, and supplying the AC power to the motor; brake relays short circuiting the motor windings by turning on when the motor brakes; brake resistors, respectively, connected to the motor windings and consuming an overcurrent generated from the motor when the brake relays short circuit the motor windings; and a switching controller turning on and turning off the switching units provided in one of opposite ends of the inverting part so that the overcurrent consumed by the brake resistors is changeable in proportion to a rotation speed of the motor, when the brake relays short circuit the motor windings to improve an effect of a dynamic braking operation and to prevent breakdown thereof.
    Type: Grant
    Filed: October 21, 2003
    Date of Patent: May 6, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jang-hyoun Youm, Jong-pill Park
  • Patent number: 7248008
    Abstract: Am improved shaded pole A.C. motor with dynamic brake that includes a secondary high resistance winding that is selectively connected to a D.C. source when the A.C. voltage is removed. To stop a motor the A.C. voltage applied to the motor is removed with tandem switches that apply the D.C. voltage immediately upon removal of the A.C. voltage or the D.C. voltage can be selectively applied subsequently. The brake winding produces a magnetic flux in the same core where the main stator winding produces the magnetic flux responsible for causing the rotor to move. The brake winding can be connected in parallel during the time the A.C. voltage is applied to increase of the combined windings' inductance (resulting in an overall higher torque) and/or in series when during the braking operation when the D.C. voltage is applied to increase the combined winding's resistance (limiting further the peak D.C. current or reducing the secondary winding size).
    Type: Grant
    Filed: October 17, 2005
    Date of Patent: July 24, 2007
    Inventor: Michael D. Cummins
  • 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: 6737822
    Abstract: A power system for an electric motor drive such as may be used in an electrically propelled vehicle incorporates the combination of a high power density battery and a high energy density battery to provide an optimal combination of high energy and high power, i.e., a hybrid battery system. The hybrid battery system in one form includes components which prevent electrical recharge energy from being applied to the high energy density battery while capturing regenerative energy in the high power density battery so as to increase an electric vehicle's range for a given amount of stored energy. A dynamic retarding function for absorbing electrical regenerative energy is used during significant vehicle deceleration and while holding speed on down-hill grades, to minimize mechanical brake wear and limit excessive voltage on the battery and power electronic control devices.
    Type: Grant
    Filed: May 29, 2001
    Date of Patent: May 18, 2004
    Assignee: General Electric Company
    Inventor: Robert Dean King
  • Patent number: 6707268
    Abstract: A system for providing driving torque to wheels on a vehicle includes an electric motor having the capability of independently driving rotatable axle shafts. One example includes a single stator with a first armature associated with a first axle shaft and a second armature associated with a second axle shaft. A controller independently controls power to the armatures to achieve the desired wheel speed or driving torque at each of the wheels.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: March 16, 2004
    Assignee: ArvinMeritor Technology, LLC
    Inventors: Dale K. Bell, Dennis A. Kramer, Clive Harrup, Mehmet S. Ciray, Silvio M. Yamada, Dean M. House, David K. Platner, Dale J. Eschenburg
  • Patent number: 6636693
    Abstract: A regenerative converter for a DC motor (55) having an armature (A, B) and a field (57), comprises a conventional three-phase matrix converter (6) including a three-phase bridge (7), the output of two phases being connected (52, 53) across the armature of the motor, the third phase being connected (58) to one end (I) of the DC motor field (57). The other end (K) of the DC motor field (57) is connected (59a) through a plurality of diodes (61-63) to respective phases of the input power.
    Type: Grant
    Filed: July 27, 2001
    Date of Patent: October 21, 2003
    Assignee: Otis Elevator Company
    Inventor: Vladimir Blasko
  • Patent number: 6441573
    Abstract: A blended electrical/friction braking system includes an electric brake feedback monitor which monitors a first signal corresponding to an electric brake effort request of an electric motor of an electrically powered vehicle. The electric brake feedback monitor detects one or more electrical conditions of the electric motor during electric braking and selectively supplies/terminates the first signal to/from a brake controller as a function of the first signal and the one or more electrical conditions. In response to termination of the first signal thereat, the brake controller causes a friction brake of the vehicle to assume the entire braking effort of the vehicle.
    Type: Grant
    Filed: April 28, 2000
    Date of Patent: August 27, 2002
    Assignee: DaimlerCrysler AG
    Inventors: Pierre A. Zuber, Richard P. Ames, Nikola V. Langovsky, William E. Madden, Jr., Steven T H Chang, Robert W. Phillips, Theresa A. Barbour
  • Patent number: 6417644
    Abstract: A device and control method to produce braking torque counter to motor rotation. A converter supplies multiple frequency AC power to the motor. A first frequency is supplied at the normal operating frequency/speed. A second frequency, different from the normal operating frequency, is supplied to produce braking torque. The level of braking can be controlled to generally consume some or all of the braking in the device or motor. More than one braking frequency may be utilized. In addition, the relationship between the normal and braking frequency(s) can be maintained to limit motor pulsation.
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: July 9, 2002
    Assignee: Robicon Corporation
    Inventors: Peter W. Hammond, Mukul Rastogi
  • Patent number: 6388894
    Abstract: A pre-wiring device creating a logic function such as an inverter function or a star-delta start function between at least two multi-pole contactors located side by side and used particularly in electrical control equipment of motors. A same pre-wiring device allows connections to be made in an identical way to several sizes of contactors which reduces accordingly the number of different terminal bars to be designed and manufactured. According to a characteristic of the invention, this pre-wiring device includes an upstream pre-wiring terminal bar 30 fitted with metal pins 31 to be inserted into the upstream wiring terminal blocks 11 of the contactors. The pre-wiring device also includes a downstream pre-wiring terminal bar.
    Type: Grant
    Filed: November 13, 2000
    Date of Patent: May 14, 2002
    Assignee: Schneider Electric Industries SA
    Inventors: Serge Paggi, Thierry Fort
  • Patent number: 6317673
    Abstract: A third braking system for an electric motorcycle includes a circuiting apparatus and a mechanism. By depressing an electric-braking button on a switch part of a handle set, a braking signal will be generated and be sent to a signal transformer via an input device of the circuiting apparatus. The signal transformer transforms the braking signal into a digital signal, and then the digital signal is sent to a CPU. After processing the digital signal and detecting the voltage level at a variable resistor, the CPU stops the transmission of driving signals to a driving circuitry for disabling the operation of a speed-control handler of the mechanism, and the CPU also generates a reverse electric potential corresponding to the detected voltage level. The reverse electric potential is then applied to a DC motor via a braking circuitry, for reducing rotation speed of the DC motor to stop the motorcycle. To relieve the braking, the speed-control handler is rotated back to an original state.
    Type: Grant
    Filed: June 11, 1999
    Date of Patent: November 13, 2001
    Inventor: Chung-Hsien Lin
  • Publication number: 20010019253
    Abstract: A device and control method to produce braking torque counter to motor rotation. A converter supplies multiple frequency AC power to the motor. A first frequency is supplied at the normal operating frequency/speed. A second frequency, different from the normal operating frequency, is supplied to produce braking torque. The level of braking can be controlled to generally consume some or all of the braking in the device or motor. More than one braking frequency may be utilized. In addition, the relationship between the normal and braking frequency(s) can be maintained to limit motor pulsation.
    Type: Application
    Filed: April 27, 2001
    Publication date: September 6, 2001
    Inventors: Peter W. Hammond, Mukul Rastogi
  • Patent number: 6262555
    Abstract: A device and control method to produce braking torque counter to motor rotation. A converter supplies multiple frequency AC power to the motor. A first frequency is supplied at the normal operating frequency/speed. A second frequency, different from the normal operating frequency, is supplied to produce braking torque. The level of braking can be controlled to generally consume some or all of the braking in the device or motor. More than one braking frequency may be utilized. In addition, the relationship between the normal and braking frequency(s) can be maintained to limit motor pulsation.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: July 17, 2001
    Assignee: Robicon Corporation
    Inventors: Peter W. Hammond, Mukul Rastogi
  • Patent number: 6204627
    Abstract: A transformer outputs different (high or low) secondary voltages. A switch outputs high or low secondary voltage according to a mode signal. An electric power converter including a rectifying circuit and a switching circuit either charges a smoothing capacitor with an output of the switch or discharges the smoothing capacitor to supply a regenerative current toward the transformer with a power fact improved. An phase signal generation circuit generates PWM or PAM phase signals in accordance with the mode signal. An inverter circuit generates driving signals supplied to the motor in response to the phase signals from power from the smoothing capacitor. A mode determining circuit determines one of modes to generate the mode signal in accordance with a speed command signal and acceleration/deceleration which is indicated by the rotating speed signal and the rotating speed command signal.
    Type: Grant
    Filed: August 16, 1999
    Date of Patent: March 20, 2001
    Assignee: Hitachi Koki Co. Ltd.
    Inventors: Shinji Watanabe, Masahiro Inaniwa, Noriyasu Matsufuji, Satoshi Numata, Takahiro Fujimaki