Speed Responsive Field Power Sources Patents (Class 318/719)
  • Patent number: 10381962
    Abstract: The invention provides a method, an apparatus and a system 1 for operating a rotating electric machine.
    Type: Grant
    Filed: October 21, 2014
    Date of Patent: August 13, 2019
    Assignee: Robert Bosch GmbH
    Inventors: Michael Ungermann, Daniel Zirkel, Mario Beyer
  • Patent number: 9821679
    Abstract: A method for the diagnosis of the offset of the resolver of an electric motor, comprising acquiring a predetermined offset of a resolver associated with the electric motor; in a first transient, supplying an excitation current to the phases of the electric motor. As a consequence of the excitation current, a current established on the axis d of minimum reluctance and a current established on an axis q in phase quadrature with respect to the axis of minimum reluctance are determined. The correctness of the offset of the resolver is diagnosed if the current established on the axis d in the first transient is higher than the current established on the axis d in the second or third transient, and if the current established on the axis q in the first transient is lower than the current established on the axis q in the second or third transient.
    Type: Grant
    Filed: August 11, 2015
    Date of Patent: November 21, 2017
    Assignee: MAGNETI MARELLI S.p.A.
    Inventors: Andrea Stefani, Alessandro Fossi, Roberto Betro', Marco Raimondi, Canio Caterini
  • Patent number: 9283957
    Abstract: A hydraulic pressure instruction-learning apparatus of a hybrid vehicle includes a power source including an engine and a motor. The engine clutch is disposed between the engine and the motor. The vehicle controller is configured to output a hydraulic pressure instruction to control engagement/disengagement of the engine clutch. The vehicle controller compares output performance of the engine clutch with predetermined dynamic target performance in a launch control, extracts a performance error function if a difference therebetween exceeds a predetermined allowable error range, and corrects the output performance of the engine clutch, such that the output performance falls within the predetermined allowable error range and is stored as a learned value.
    Type: Grant
    Filed: November 24, 2014
    Date of Patent: March 15, 2016
    Assignees: HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION, SNU R&DB FOUNDATION
    Inventors: Seongwook Moon, Daero Park, Seok Min Jeong, Jae Ho Lee, Jung Un An, Hee Yun Lee, Won Sik Lim, Nam Woong Kim, Kyo Bum Lee, Howon Seo, Suk-Won Cha
  • Publication number: 20150097509
    Abstract: An electric motor control device includes a torque command generation portion that outputs a torque command ?c generated on the basis of a rotation speed R and specifying an output torque, a minimum energization point number generation portion that generates a minimum number of energization points, Nmin, indicating the minimum number of points to be energized in windings of an armature and a field on the basis of the rotation speed R and the torque command ?c, an energization signal generation portion that outputs an energization signal S on the basis of a state quantity M of an electric motor, the minimum number of energization points, Nmin, the torque command ?c, a DC voltage value Vdc, a current value I, and a field position ?, and an energization portion that energizes an armature winding and a field winding according to the energization signal S.
    Type: Application
    Filed: June 9, 2014
    Publication date: April 9, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yuya HISANO, Ryo NAKAMURA
  • Patent number: 8648555
    Abstract: A data processor determines whether a composite torque command is larger than a preset torque threshold for a time interval. The composite torque command is convertible into a direct-axis current command and a quadrature-axis current command. The data processor determines whether a rotor speed of the motor is less than a preset speed threshold for the time interval. The data processor, the current adjustment module, or the current shaping module adjusts the direct-axis current command and the quadrature-axis current command to obtain a revised direct-axis current command and revised quadrature-axis current command for the time interval if the composite torque command is larger than the preset torque threshold and if the rotor speed is less than the preset speed threshold, where the revised current commands vary by the detected rotational position of the rotor to achieve a generally constant shaft torque output.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: February 11, 2014
    Assignee: Deere & Company
    Inventors: Long Wu, Robert Shaw
  • Patent number: 8593095
    Abstract: An example method of initiating operation of a wound field synchronous machine in a motoring mode includes estimating an initial position of a rotor of a wound field synchronous machine using a carrier injection sensorless stimulation signal. The method tracks an operating position of the rotor based on current harmonics of the wound field synchronous machine. The method also calibrates the tracking using the initial position.
    Type: Grant
    Filed: May 24, 2011
    Date of Patent: November 26, 2013
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Albert L. Markunas, Dhaval Patel
  • Patent number: 8587229
    Abstract: A method for braking the thermal engine of an automobile using a multiple-phase rotary electric machine (1) connected to the thermal engine and including a stator and a rotor (4) having at least one excitation winding (41). A shortcut of at least one phase of the multiple-phase rotary machine is included during the stop phase of the thermal engine. The multiple-phase rotary electric machine is capable of braking the thermal engine of an automobile during the stop phase thereof due to the fact that a shortcut is induced, during the stop phase of the thermal engine, of at least one of the phases thereof.
    Type: Grant
    Filed: June 24, 2008
    Date of Patent: November 19, 2013
    Assignee: Valeo Equipements Electriques Moteur
    Inventors: Farouk Boudjemai, Jean-Marc Dubus, Oussama Rouis, Sylvain Delion, Khadija Elbaraka, Jean-Claude Matt
  • Patent number: 8541969
    Abstract: In a method and a device for pulse width modulated (PWM-) activation of an electrical drive motor (2) of an adjustment arrangement based on a reference of the mechanical system of the adjustment arrangement that corresponds to a relationship between the force (F) on the drive motor (2) and the adjustment path (s) or the adjustment time (t) of the adjustment arrangement stored in a memory (9), an anticipated future force value (F(t+t0)) is determined based on the reference of the mechanical system in order to adjust the PWM activation in advance by utilizing this future force value such that motor synchronization fluctuations can be prevented upon anticipated mechanical fluctuations in the adjustment arrangement.
    Type: Grant
    Filed: January 28, 2010
    Date of Patent: September 24, 2013
    Assignee: Continental Automotive GmbH
    Inventors: Stefan Holzinger, Roman Morawek, Daniel Zuffer
  • Patent number: 8508179
    Abstract: In a separately excited electrical synchronous machine, and a method for operating a synchronous machine, coil windings, in particular in the form of excitation coils, are disposed on the rotor, the electrical supply of the coil windings being achieved with the aid of an inductive rotation transmitter, whose secondary winding is connected to the rotor and whose primary winding, which is inductively coupled to the secondary winding, is stationary, especially connected to the stator of the synchronous machine.
    Type: Grant
    Filed: May 9, 2009
    Date of Patent: August 13, 2013
    Assignee: Sew-Eurodrive GmbH & Co. KG
    Inventors: Josef Schmidt, Matthias Hauck, Marek Lewandowski
  • Patent number: 8427096
    Abstract: A rotating electrical machine including a first member (10) capable of generating a magnetic field which rotates relative to the first member, and a second member (6) which is provided with a winding through which a current can flow, such that the rotating magnetic field drives the second member in rotation. An electrical value which is at least related to the current is measured (18) and the generation of the rotating magnetic field is started (12) at a time which is determined as a function of the electrical value which is measured. A method of controlling the machine is also disclosed.
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: April 23, 2013
    Assignee: Valeo Equipements Electriques Moteur
    Inventors: Ludovic Bodin, Michaël Chemin
  • Patent number: 8410735
    Abstract: A torque ripple suppression control device for a permanent magnet motor includes a current command conversion unit that outputs a current command value, a position detector that detects a rotational position of the permanent magnet motor, a current detection unit that detects a current at the permanent magnet motor, an induced voltage coefficient setting unit that outputs an information signal related to an induced voltage coefficient for an induced voltage at the permanent magnet motor, a torque ripple suppression operation unit that outputs a current correction command value for the permanent magnet motor, a current control operation unit that outputs a voltage command value based upon addition results obtained by adding together the current command value and the current correction command value and the current detection value, and a power converter that outputs a voltage with which the permanent magnet motor is to be driven.
    Type: Grant
    Filed: January 19, 2011
    Date of Patent: April 2, 2013
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Kazuaki Tobari, Yoshitaka Iwaji, Junnosuke Nakatsugawa, Rikio Yoshikawa, Masamichi Yagai
  • Patent number: 8390229
    Abstract: A method of braking a washing machine from an operational speed to a reduced non-zero speed is provided (as well as a washing machine incorporating the method) for a washing machine driven by one of a synchronous or asynchronous motor. Upon receipt of a speed reduction signal, the motor rotating magnetic fields are collapsed for a defined time period. After the defined time period, DC braking voltage is applied to the motor stator windings at a controlled ramp-up rate to an amplitude to generate a controlled ramped braking torque on the motor until the motor has slowed to a defined reduced speed. Thereafter, the amplitude of the DC braking voltage is set to 0V and the motor is soft started to an amplitude and reduced frequency needed to maintain the defined reduced speed.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: March 5, 2013
    Assignee: General Electric Company
    Inventor: Richard Dean Suel, II
  • Patent number: 8159170
    Abstract: When cooling operation or dehumidifying operation is started, a blower fan for an evaporator and an exhaust fan for a condenser are driven at an initial rotational number. A compressor is driven at a fixed rotational number. Due to load variation, an operating current supplied from a power source is changed. When the operating current exceeds a reference value, the rotational number of the blower fan is gradually reduced. When an endothermic quantity by the evaporator decreases, a temperature of a gas refrigerant flowing through the evaporator is lowered. Since the load applied on the compressor is reduced, the operating current decreases. In this way, when the compressor is loaded, the operating current increased, however, by controlling operation of the fans as described above, it is possible to prevent that the power source is shut off due to overcurrent and operation is stopped.
    Type: Grant
    Filed: January 28, 2009
    Date of Patent: April 17, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Atsushi Kakiuchi
  • Patent number: 8120296
    Abstract: A motor magnetic pole position detecting device includes a detection current command generation unit generating a detection AC current command, a current detection section detecting a current flowing into the motor, a coordinate conversion unit vector-converting the current detected by the current detection section into an excitation component and a torque component both represented by a d-q orthogonal coordinate system based on a phase angle obtained at any rotational frequency, a current control unit delivering a voltage command to current-control the motor based on the detection current command and the current converted by the coordinate conversion unit, an inductance calculation unit calculating motor inductance based on the voltage command and the current converted by the coordinate conversion unit, and a magnetic pole position detection section calculating a frequency and phase of the inductance calculated by the inductance calculation unit, converting the inductance phase into a motor magnetic pole pos
    Type: Grant
    Filed: October 6, 2009
    Date of Patent: February 21, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Sari Maekawa
  • Patent number: 7944168
    Abstract: A device for determining the position of the rotor of a rotating electrical machine. The invention is characterized in that the device comprises a plurality of magnetic field sensors stationary relative to the stator and adapted to deliver multiphase electric signals representing a magnetic field detected by the sensors, and means for processing the multiphase electric signals by an operator capable of providing diphase signals depending on the position of the rotor. The invention is applicable to rotating electrical machines used in the automotive industry.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: May 17, 2011
    Assignee: Valeo Equipements Electriques Moteur
    Inventors: Michaël Chemin, Frédéric Leroux, Gilbert Konan
  • Publication number: 20110050152
    Abstract: A method and apparatus for control of an alternating current electric motor with field weakening, including setting a required operating point for a motor field voltage component as a function of a difference between actual and required motor field current components, and setting a required operating point for a motor torque voltage component as a function of a difference between actual and required motor torque current components. The method also includes setting a field weakening constituent for the required operating point for the motor field voltage component as a function of a difference between a required operating point and an available value of the motor torque voltage component and as a function of a difference between actual and required motor torque current components.
    Type: Application
    Filed: May 16, 2008
    Publication date: March 3, 2011
    Applicant: Freescale Semiconductor, Inc.
    Inventors: Roman Filka, Peter Balazovic
  • Patent number: 7880424
    Abstract: A rotary electric apparatus comprise a synchronous machine of field winding type, an inverter, a DC power supply, a current flow regulator, and a controller. The DC power supply outputs first voltage of a first voltage value and second voltage of a second voltage value higher than the first voltage value. The current flow regulator regulates directions of currents flowing through a field winding by rotor exciting currents into one way, the current flow regulator being electrically connected to the field winding. The controller controls the inverter such that the inverter produces armature currents consisting of synchronized currents producing rotating fields depending on a rotating position of a rotor and rotor exciting currents different in waveforms from the synchronized currents and superposed on the synchronized currents. At least the rotor exciting currents are powered on a second voltage from the DC power supply.
    Type: Grant
    Filed: September 27, 2007
    Date of Patent: February 1, 2011
    Assignee: Denso Corporation
    Inventor: Masahiro Seguchi
  • Patent number: 7863852
    Abstract: A control circuit of a motor includes at least two sensor chips and at least two winding sets. The sensor chips are electrically connected to each other, and each of the winding sets has a first winding and a second winding. The first end of the first windings and the first end of the second windings are electrically connected to each other, and the second end of the first windings and the second end of the second windings are electrically connected to the sensor chips correspondingly. In addition, a motor having the control circuit is also disclosed.
    Type: Grant
    Filed: February 11, 2008
    Date of Patent: January 4, 2011
    Assignee: Delta Electronics, Inc.
    Inventors: Lee Long Chen, Chi-Chen Shen
  • Patent number: 7852040
    Abstract: A motor driver system and its control methods are discussed. Even when a command magnetic flux decreases as a motor operates in a field weakening region, a current angle can be maintained always below a limit value, thereby obtaining the stability of the motor control.
    Type: Grant
    Filed: November 16, 2007
    Date of Patent: December 14, 2010
    Assignee: LG Electronics Inc.
    Inventors: Kyung Hoon Lee, June Hee Won, Gil Su Lee, Jun Ho Ahn, Jae Yoon Oh
  • Patent number: 7586286
    Abstract: A system and method for controlling a permanent magnet motor are disclosed. Briefly described, one embodiment receives a torque command and a flux command; receives information corresponding to a direct current (DC) bus voltage and a motor speed; computationally determines feedforward direct-axis current information and feedforward quadrature-axis current information from a plurality of parameters associated with the permanent magnet motor; determines a current signal (idq*) based upon at least the requested torque command, the flux command, the DC bus voltage, the motor speed, the feedforward direct-axis current information, and the feedforward quadrature-axis current information; and controls a power inverter that converts DC power into alternating current (AC) power that is supplied to the permanent magnet motor, such that the permanent magnet motor is operated in accordance with the determined idq*.
    Type: Grant
    Filed: November 17, 2006
    Date of Patent: September 8, 2009
    Assignee: Continental Automotive Systems US, Inc.
    Inventors: Bing Cheng, Tod R. Tesch
  • Patent number: 7511439
    Abstract: A method for starting a sensorless, electronically commutatable direct current motor, having a permanent-magnetically excited rotor in which the stator carries a three-phase stator winding, whose regulated supply of current from a direct voltage source is already made possible from the standstill state.
    Type: Grant
    Filed: February 4, 2005
    Date of Patent: March 31, 2009
    Assignee: Robert Bosch GmbH
    Inventors: Volker Bosch, Bernd Wirnitzer
  • Patent number: 7358698
    Abstract: A field-winding type of synchronous machine comprises a stator with an armature winding wound phase by phase, a rotor having a rotor core with a field winding wound, and a circuit enabling an armature current to pass the armature winding, the armature current corresponding to a synchronous current producing a rotation field rotating at an electrical-angle rotation speed agreeing to a rotation speed of the rotor. The synchronous machine further comprises a current suppressor and a current supplier. The current suppressor is connected to the field winging and suppresses, into a unidirectional current, an induced alternating current induced through the field winding in response to the armature current passing the armature winding. The current supplier supplies, phase by phase, to the armature winding a rotor exciting current whose waveform is different from the synchronous current only during a predetermined period of time shorter than one cycle of the synchronous current.
    Type: Grant
    Filed: June 28, 2006
    Date of Patent: April 15, 2008
    Assignee: Denso Corporation
    Inventors: Masahiro Seguchi, Yurio Nomura, Hiroya Tsuji
  • Patent number: 7339344
    Abstract: A plurality of parameters of a Permanent Magnet Synchronous Motor (PMSM) is determined by a motor controller for differentiating between a plurality of PMSMs. This is achieved by first applying regulated DC motor currents at a commanded fixed rotor angle and measuring a quadrature voltage; parking the PMSM at standstill, Then, after selecting an initial set of controller parameters; applying the quadrature voltage equal to zero and measuring a time constant. Then, accelerating the PMSM with a constant torque up to a preset target speed and measuring a total acceleration time taccelerate until the preset target speed ?target is reached. After regulating a stator current at 0 value, measuring the quadrature voltage and a freewheeling motor speed ?freewheel immediately after applying the 0 stator current; and calculating an electrical constant KE of the PMSM; a load inertia J; and a set of parameters for the controller.
    Type: Grant
    Filed: July 21, 2006
    Date of Patent: March 4, 2008
    Assignee: International Rectifier Corporation
    Inventor: Ana Borisavljevic
  • Patent number: 7256563
    Abstract: A method and a device for providing field-oriented regulation of a synchronous machine excited by a permanent magnet, in which a direct-axis voltage component and a quadrature-axis voltage component of the control voltage for the synchronous machine are determined from a quadrature-axis current component setpoint value thus determined and from rotational speed information using a stationary machine model in a decoupling network. These voltage components are converted into triggering pulses for the synchronous machine. The regulating system does not require any information regarding the phase currents of the polyphase system.
    Type: Grant
    Filed: February 10, 2003
    Date of Patent: August 14, 2007
    Assignee: Robert Bosch
    Inventors: Jochen Kuehner, Klaus Rechberger
  • Patent number: 7180263
    Abstract: Synchronous motor controlling apparatus and method controls power applied to minimize or eliminate speed variations of a synchronous motor due to variations in load imposed the motor. The rotational position of a rotor of the synchronous motor based on the input terminal voltages and currents to the synchronous motor, and the power applied to the motor is adjusted accordingly. Higher harmonics of the input voltages and currents may also be used to detect the position of the rotor. In addition, the apparatus and method also accounts for the varying speed command inputs.
    Type: Grant
    Filed: November 9, 2001
    Date of Patent: February 20, 2007
    Assignee: Daikin Industries, Ltd.
    Inventors: Toshiyuki Maeda, Manabu Kosaka, Masanobu Kita
  • Patent number: 7026783
    Abstract: A drive system includes a central power supply with a line-commutated converter and a DC/DC converter connected downstream of the line-commutated converter, and a plurality of inverters, each inverter having an output connected a load, for example a motor, and a DC input connected to a regulated DC voltage output of the central power supply. Buffer capacitors are connected across the respective input and output of the DC/DC converter. The drive system further includes an energy recovery device with an input connected to the controlled voltage output of the central power supply and an output connected to at least two input terminals of the line-commutated converter. This type of drive system eliminates a bulky brake circuit.
    Type: Grant
    Filed: November 30, 2004
    Date of Patent: April 11, 2006
    Assignee: Siemens Aktiengesellschaft
    Inventor: Dieter Eckardt
  • Patent number: 6984958
    Abstract: Method for defining quadrature-axis magnetizing inductance of a synchronous machine, the synchronous machine being supplied by an inverter. The method comprises steps, wherein the synchronous machine is started without load or with reduced load; the rotor current of the synchronous machine is kept substantially at zero, the synchronous machine is accelerated to initial angular velocity of measurement, the load angle (ds) of the synchronous machine is guided substantially to 90 degrees, the stator voltage (us), the stator current (is) and the electrical angular velocity (?) of the synchronous machine is defined and the quadrature-axis magnetizing inductance of the synchronous machine (lmq) is defined on the basis of the stator voltage (us), the stator current (is) and the electrical angular velocity (?) of the machine.
    Type: Grant
    Filed: December 2, 2003
    Date of Patent: January 10, 2006
    Assignee: ABB OY
    Inventor: Jouko Niiranen
  • Patent number: 6979975
    Abstract: In a conventional rotation state detecting apparatus of a synchronous machine, since short-circuiting must be carried out twice or more when a rotation speed is detected, there have been problems in that it takes a time to detect a rotation state, and it takes a time to start up. A rotation state detecting apparatus for a synchronous machine according to the present invention has been made to solve the above problem, and includes a calculation unit for outputting a voltage vector command and a trigger signal and for outputting a rotation state of a synchronous machine having at least three windings in an idle state, a circuit unit for applying voltages to the respective phases of the synchronous machine on the basis of the voltage vector command, and a detection unit for detecting a current of the synchronous machine on the basis of the trigger signal and outputting a value of the detected current to the calculation unit.
    Type: Grant
    Filed: March 27, 2000
    Date of Patent: December 27, 2005
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshihiko Kinpara, Toshiyuki Kaitani
  • Patent number: 6924617
    Abstract: A control system for an electric motor having a stator and rotor including an inverter for providing power to the electric motor, a controller for controlling the inverter, a low speed control block to estimate the rotor angular position using stator current components operating in the controller, a high speed control block to estimate the rotor angular position using stator current components and stator flux position operating in the controller, a transition switch in the controller to vary operation between the low speed control block and the high speed control block, and where the inverter is controlled by six step operation.
    Type: Grant
    Filed: June 23, 2003
    Date of Patent: August 2, 2005
    Assignee: General Motors Corporation
    Inventors: Steven E. Schulz, Nitinkumar R. Patel, James M. Nagashima, Seung Ki Sul, Bon-Ho Bae
  • Publication number: 20040056630
    Abstract: The invention provides a synchronous motor sensorless controller which drives a synchronous motor without use of a rotational position sensor. The controller has a relative position counter 4 which acquires an estimated position of a magnetic pole from the position-and-speed estimation device simultaneously with resetting a summated value to zero when the reference position signal is input and which starts summation operation; and a speed instruction generator 3 having a position controller 29 which performs position control operation on the basis of a deviation between an instruction value pertaining to the amount of movement from the reference position and a summated value output as a relative position from the relative position counter, the generator outputting a speed instruction. The sensorless controller can position at a predetermined location a synchronous motor not having a position sensor.
    Type: Application
    Filed: May 8, 2003
    Publication date: March 25, 2004
    Inventor: Toshiyuki Kaitani
  • Publication number: 20040056629
    Abstract: This synchronous motor controlling apparatus comprises a current detection section 5a, voltage detection section 5b, position and speed detection section 6, speed difference calculation section 7a, speed controlling section 7b, torque controlling section 7c, multiplication section 7d, phase controlling section 8, and current controlling section 9. The current detection section 5a detects a motor current supplied to the synchronous motor 4. The voltage detection section 5b detects a voltage at a terminal of the synchronous motor 4. The position and speed detection section 6 is determined a motor model therein, receives the motor current and voltage as input, carries out predetermined operation, and detects a rotation speed of a rotor and rotation position of the rotor. The speed difference calculation section 7a calculates a difference between the detected speed and a speed command given from the exterior.
    Type: Application
    Filed: October 31, 2003
    Publication date: March 25, 2004
    Inventors: Toshiyuki Maeda, Manabu Kosaka, Masanobu Kita
  • Patent number: 6310450
    Abstract: A method is for decoding three logic signals produced by three Hall effect sensors installed in an electronically-switched three-phase brushless motor according to a sequence of six driving phases to be switched synchronously with a rotor position. The method includes determining a real phasing of the three Hall effect sensors at 60, 120, 300 or 240 electrical degrees. The determining is accomplished by decoding a whole set of eight possible combinations of the three logic signals produced by the three Hall effect sensors. The real phasing of the three Hall effect sensors is discriminated based upon two dissimilar combinations from among six valid combinations, the six valid combinations from among the eight possible combinations. The method further includes determining the rotor position based upon the real phasing of the three Hall effect sensors and generating logic driving signals synchronous with the rotor position.
    Type: Grant
    Filed: April 21, 2000
    Date of Patent: October 30, 2001
    Assignee: STMicroelectronics S.r.l.
    Inventor: Domenico Arrigo
  • Patent number: 6150776
    Abstract: A variable frequency motor starting system has a variable frequency AC power supply for generating an AC power output signal applied to an AC motor. A controller is coupled to the variable frequency AC power supply for producing a control signal for adjusting the frequency of the AC power output signal produced. Upon initially applying power to an AC motor or detection of a starting current for an AC motor, the controller adjusts the frequency of the power output signal applied to the AC motor. The frequency of the power output signal is adjusted to a value below the value of the typical operating frequency. The value of the frequency can be increased to the final operating value.
    Type: Grant
    Filed: May 4, 1999
    Date of Patent: November 21, 2000
    Assignee: Metropolitan Industries, Inc.
    Inventors: Richard W. Potter, Anton Belehradek
  • Patent number: 6114827
    Abstract: A device for controlling a synchronous electric motor with a permanent magnet rotor. The device comprises a stator including a winding disposed around a stack of laminations and with which is associated a permanent magnet rotor. Controlled conductor devices are connected to the stator winding and to an AC source. One or more position sensors determine the application to the control inputs of the said controlled conductor devices of electrical control signals having to states which vary as a function of the angular position of the rotor. The arrangement is such that the current is caused to flow in the stator winding in a direction which depends only on the polarity of the voltage of the source and the instantaneous position of the rotor.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: September 5, 2000
    Assignee: Plaset Spa
    Inventor: Nicolino Alvaro
  • Patent number: 6023137
    Abstract: A method and apparatus for cranking of an internal combustion engine in an AC electric traction motor propelled vehicle using inverters normally coupled to supply power to each of a plurality of AC motors. The inverters have DC input terminals connected between a relatively positive DC bus and a relatively negative DC bus and the DC buses are connected to DC output terminals of a rectifier. The rectifier has AC input terminals connected to stator terminals of a synchronous generator. The generator includes a field winding and a rotor connected in driving relationship to a crank shaft of the engine.
    Type: Grant
    Filed: August 14, 1998
    Date of Patent: February 8, 2000
    Assignee: General Electric Company
    Inventors: Ajith Kuttannair Kumar, Ronald Francis Griebel
  • Patent number: 5912543
    Abstract: Electronic circuit having a digital controller operation of a synchronous motor.Precision motors for driving, for example, a video head drum in video recorders are normally designed as externally commutated synchronous motors. These motors are driven with square-wave voltages by a digital controller (CON), whose circuitry can easily be implemented.The object of the present invention is to specify an electronic circuit of the type mentioned initially for controlling a synchronous motor, which enables good synchronism and the motor to be operated with little electrical noise.This object is achieved in that the synchronous motor is driven by sinusoidal signals, a separate control signal from the controller (CON) influencing the amplitudes of the drive signals (U1, V1, W1). A regulating signal for regulating the synchronous motor is produced by a sensor (GE) which is arranged on the synchronous motor, which regulating signal produces a fixed phase relationship between rotor revolution and drive signals.
    Type: Grant
    Filed: October 18, 1996
    Date of Patent: June 15, 1999
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Peter Mahr, Gerhard Reiner
  • Patent number: 5852356
    Abstract: Disclosed is a dc/ac inverter for the supply of alternating current to the windings of a synchronous electrical motor, especially for the traction of an electrical vehicle. During each half-wave of the alternating current, the dc/ac inverter with solid-state switches delivers steady levels of constant intensity. During each steady level, the intensity of the current is determined by the cyclical ratio of a chopping signal that controls the conduction of the transistor-based or thyristor-based switches. At zero speed of the rotor, the frequency f of the chopping signal has a value (f', 1 khz) smaller than the chopping frequency (8 kHz) for a speed different from zero. Thus the starting losses or the losses with the rotor off are minimized.
    Type: Grant
    Filed: January 27, 1997
    Date of Patent: December 22, 1998
    Assignees: Thomson-CSF, Semikron International
    Inventors: Alain Levy, Ernst Schimanek, Wolfram Dietze
  • Patent number: 5757161
    Abstract: A motor control apparatus for detecting motor overspeed in an electric car to prevent destruction of the motor and assure the safety of the vehicle. Torque control is applied when the motor speed is less than a specified rotational velocity. When the motor is detected to be operating at greater than the specified rotational velocity, i.e., when motor overspeed is detected, the motor is controlled to coast or regenerate to lower the motor speed to less than the specified rotational velocity, after which normal control is resumed, thereby preventing collision due to sudden braking and preventing damage to the motor.
    Type: Grant
    Filed: April 21, 1997
    Date of Patent: May 26, 1998
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yasufumi Ikkai, Satoshi Tamaki
  • Patent number: 5734135
    Abstract: In a system for starting elevator machinery driven by a synchronous motor, current is fed to the motor by a frequency converter and a traction sheave is connected to the motor to move the elevator car with hoisting ropes. The angle of the magnetic field of the stator is determined when the elevator stops. When the motor is started again, a new value of the angle of the magnetic field of the stator is determined on the basis of the change in the load signal. The frequency converter is adjusted so that a magnetic field whose direction corresponds to the new angle of the magnetic field of the stator is generated in the motor.
    Type: Grant
    Filed: September 28, 1995
    Date of Patent: March 31, 1998
    Assignee: Kone Oy
    Inventors: Harri Hakala, Jorma Mustalahti, Esko Aulanko
  • Patent number: 5731669
    Abstract: A control apparatus for an electric vehicle includes a device for detecting a degree of depression of an accelerator pedal in the electric vehicle, and for outputting an accelerator depression degree signal representing the detected degree of depression of the accelerator pedal. A polyphase ac motor is operative for driving the electric vehicle. A rotational speed of the polyphase ac motor is detected, and a motor rotational speed signal is generated which represents the detected rotational speed of the polyphase ac motor. A battery in the vehicle generates dc power. An inverter changes the dc power into ac power through pulse width modulation responsive to a PWM modulation signal, and outputs the ac power to the polyphase ac motor to drive the latter. A steady torque command value is calculated on the basis of the motor rotational speed signal and the accelerator depression degree signal.
    Type: Grant
    Filed: September 13, 1996
    Date of Patent: March 24, 1998
    Assignee: Nippondenso Co., Ltd.
    Inventors: Takumi Shimizu, Tsuneyuki Egami
  • Patent number: 5656911
    Abstract: A driving device controls a permanent-magnet synchronous motor having a permanent magnet in its rotor using a voltage-type inverter supplying drive power for the synchronous motor, makes the torque of the synchronous motor and the d-axis current flowing in the synchronous motor in the direction of the magnetic flux generated by the permanent magnet approach their own command values, and performs weakening field control by decreasing the d-axis current. To perform the above described control without complicated d-axis current command value operations or temperature amendments to motor constants, the driving device includes a proportional controller for outputting a d-axis signal proportional to the deviation between a d-axis current detection value and a d-axis current command value for the motor.
    Type: Grant
    Filed: December 20, 1995
    Date of Patent: August 12, 1997
    Assignees: Fuji Electric Company, Nissan Motor Company
    Inventors: Tomoharu Nakayama, Koetsu Fujita, Shigenori Kinoshita, Takao Yanase, Masahiko Hanazawa, Shinichiro Kitada, Toshio Kikuchi, Takeshi Aso
  • Patent number: 5635810
    Abstract: A control system for a permanent magnet synchronous motor includes a position estimator means having for cross correlating the back EMF of the unenergized winding with a reference waveform to determine the estimated position of the rotor for determining rotor angle position error; an error compensator, responsive to the rotor angle position error, for determining the angular speed of the field; an angle generator, responsive to the angular speed of the field, for generating the field angle position; and a waveform generator, responsive to the rotor angle position, for generating a periodic signal corresponding to each winding and designating a segment of that signal for driving that winding to adjust the field speed to the rotor speed.
    Type: Grant
    Filed: September 20, 1995
    Date of Patent: June 3, 1997
    Assignee: Analog Devices, Inc.
    Inventor: Rakesh Goel
  • Patent number: 5583411
    Abstract: A synchronous motor control system controls a synchronous motor on an electric vehicle for propelling the electric vehicle in a propulsive mode or regenerating electric energy in a regenerative model. The synchronous motor control system has a rotational speed sensor for detecting a rotational speed of the synchronous motor, an accelerator for producing a torque command signal, and a driver connected between a battery on the electric vehicle and the synchronous motor for operating the synchronous motor in either the propulsive mode or the regenerative mode. A controller is responsive to the rotational speed detected by the rotational speed sensor and the torque command signal produced by the accelerator for controlling the driver to operate the synchronous motor in either the propulsive mode or the regenerative mode.
    Type: Grant
    Filed: August 4, 1993
    Date of Patent: December 10, 1996
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Katsuyuki Kusano, Yasushi Kanai, Akishiro Takeuchi, Yuji Saito
  • Patent number: 5504404
    Abstract: In a method and an apparatus for controlling a motor, one type or a plurality of types of weakening current are previously set, a first torque command current determined from a speed deviation between a speed command to the motor and the present speed of the motor is compared with torque currents corresponding the torques, so that a second torque command current and a weakening current are determined and outputted depending on which range of the torque currents corresponding the torques the first torque command current falls upon. Thus, the second torque command current and the weakening current can be determined simply and efficiently.
    Type: Grant
    Filed: September 16, 1994
    Date of Patent: April 2, 1996
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Satoshi Tamaki, Yasufumi Ikkai, Yasuhiro Kondo
  • Patent number: 5436544
    Abstract: An AC synchronous motor control method in which the optimum phase advancing control is executed not only in acceleration but also in deceleration of a motor. When a value P, which is obtained by multiplying a motor's revolutionary speed by a torque command, is positive or equal to "0", a proportional constant of a linear equation for calculating a phase advancing compensation amount .delta. is set to k, whereas, when the above value P is negative, the above proportional constant is set to k' (k'<k). Then, the phase advancing compensation amount .delta. is calculated by using the proportional constant k or k', and the calculated compensation amount .delta. is added to a rotor phase .theta., thus advancing the phase of current commands. The motor is controlled by executing current loop processing on the basis of a current command T thus obtained.
    Type: Grant
    Filed: January 27, 1994
    Date of Patent: July 25, 1995
    Assignee: Fanuc Ltd.
    Inventors: Shunsuke Matsubara, Tadashi Okita
  • Patent number: 5387854
    Abstract: A method for smoothing the torque characteristics of a multi-phase PM synchronous machine by controlled driving with a conventional voltage source inverter operated in accordance with a predetermined switching sequence wherein the sum of the excitation voltages applied to the incoming phase winding and outgoing phase winding are maintained constant at a predetermined value for the duration of each commutation period. In addition, the individual excitation voltages applied to the remaining phase active windings are also held constant during the commutation period.
    Type: Grant
    Filed: May 28, 1993
    Date of Patent: February 7, 1995
    Assignee: Electric Power Research Institute, Inc.
    Inventors: Patrick J. McCleer, Jack S. Lawler, Natarajan Narasimhamurthi
  • Patent number: 5262709
    Abstract: A pulse motor control circuit for starting up and synchronizing a sync pulse motor (for use typically in factory automation or precise machining) with an external sync signal. The control circuit applies a starting drive pulse signal to start up and drive the motor to place it in synchronism with the external signal, and then switches the drive pulse signal to the external signal for the synchronous revolution of the motor. The starting drive pulse signal has a variable frequency which is varied from a frequency in the self-starting region to that of the external sync signal.
    Type: Grant
    Filed: February 6, 1992
    Date of Patent: November 16, 1993
    Assignee: Matsushita Electric Industrial Co. Ltd.
    Inventor: Akio Yasuda
  • Patent number: 4939441
    Abstract: An excitation system for a brushless generator includes an exciter portion having a set of polyphase exciter field windings and an additional exciter field winding disposed in a stator of the generator, a source of polyphase, constant-frequency AC power and circuitry coupled to the set of polyphase field winding for connecting the source of polyphase, constant-frequency AC power thereto at a beginning of operation in a starting mode whereby AC power is induced in an exciter portion armature winding by transformer action. AC power is further provided to armature windings of a main generator portion to thereby cause a rotor of the generator to accelerate. An autotransformer is provided to reduce the voltage provided by the source of polyphase AC power prior to application of such power to the polyphase field windings so that the need for an auxiliary inverter is obviated.
    Type: Grant
    Filed: October 27, 1989
    Date of Patent: July 3, 1990
    Assignee: Sundstrand Corporation
    Inventor: P. John Dhyanchand
  • Patent number: 4804900
    Abstract: A synchronous motor control apparatus includes a polyphase synchronous motor, a frequency adjusting circuit responsive to the closing of a power supply switch to generate a frequency control signal for commanding to linearly increase an oscillation frequency from zero up to a given high frequency, a polyphase rectangular oscillation circuit whose oscillation frequency for polyphase rectangular waves is controlled in accordance with the frequency control signal, an energization phase adjusting circuit for generating a phase control signal in accordance with a signal related to the frequency control signal from the frequency adjusting circuit, an energization phase calculating circuit for controlling the phases of the polyphase rectangular oscillation frequency of the polyphase oscillation circuit, and a drive circuit for amplifying output polyphase rectangular signals of the energization phase calculating circuit and applying the same to a field winding of the motor.
    Type: Grant
    Filed: May 4, 1988
    Date of Patent: February 14, 1989
    Assignee: Yamamoto Electric Corporation
    Inventor: Katsuji Soeda
  • Patent number: 4616166
    Abstract: For starting a rotatable 3-phase a-c electrical machine of the synchronous type, the stator windings of the machine are connected to an electric storage battery via a controllable electric power converter, and the d-c field winding is connected in series with the stator windings by inserting it in the load current path between the converter and battery. Field weakening resistance is connected in parallel with the field winding. The converter includes a plurality of electric valves (thyristors) that are cyclically turned on in a predetermined sequence in synchronism with alternating voltages developed at the line terminals of the stator windings.
    Type: Grant
    Filed: December 10, 1984
    Date of Patent: October 7, 1986
    Assignee: General Electric Company
    Inventors: Charles E. Cooper, Thomas D. Stitt