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| Number | Title | Issue Date |
| 6377019 | Peak torque per ampere method for induction motor vector control An induction motor control system (10) for electric vehicles having a DC power supply (14), an inverter (16), an induction motor (12), a motor controller (26) and a vehicle-level controller (32). The method and system of the present invention optimizes th... | 04/23/2002 |
| 6348775 | Drive wave form synchronization for induction motors A polyphase induction motor is operated by an inverter drive system comprising a logic level controller. A number, preferably twelve or more, of independently driven phases causes harmonic fields, up to a number equal to the number of phases, to oscillate... | 02/19/2002 |
| 6344726 | Method of controlling an induction motor If a speed instruction value is less than a predetermined value, the output current of a power-conversion unit is controlled to be larger than a current value in an ordinary no-load operation, or a frequency instruction value is calculated based on a spee... | 02/05/2002 |
| 6335609 | Method for reducing peak phase current and decreasing staring time for an internal combustion engine having an induction machine A method for reducing the starting time and reducing the peak phase currents for an internal combustion engine that is started using an induction machine starter/alternator. The starting time is reduced by pre-fluxing the induction machine and the peak ph... | 01/01/2002 |
| 6326762 | Method of braking a vector controlled induction machine, control device for carrying out the method and storage medium A method and a control device for braking a variable speed vector controlled induction machine are driven by a pulse width modulation (PWM) inverter, in which the q-current component and the d-current component of the stator current are controlled indepen... | 12/04/2001 |
| 6316904 | Speed and rotor time constant estimation for torque control of an induction motor A speed sensorless controller for an induction motor with rotor resistance estimation, using stator currents and voltages. The rotor resistance and speed estimation are obtained as a solution of a linear algebraic system with pseudo current and voltage si... | 11/13/2001 |
| 6313603 | Method of regulating a rotary machine, and power supply circuit for such a machine A method of regulating a rotary machine powered by a voltage inverter receiving, as input a control voltage delivered by a regulator servo-controlling the electromagnetic torque on a reference value, the regulator receiving as inputs the reference value a... | 11/06/2001 |
| 6301136 | Floating flame controller A floating frame controller determines a current Park vector, selects a reference frame for the current Park vector, and adjusts the reference frame until a quadrature component of a current Park vector in the adjusted reference frame is equal to a predet... | 10/09/2001 |
| 6281656 | Synchronous motor control device electric motor vehicle control device and method of controlling synchronous motor A synchronous motor control system includes a synchronous motor 1, an inverter 3 and a controller 4 wherein a current differential detecting unit 13 detects a variation of a motor current when the three phases of the motor 1 is short circuited by the inve... | 08/28/2001 |
| 6242885 | Method for estimating induced electromotive force and speed of induction motor, method for correcting misalignment of shaft thereof, and induction motor controller A three-phase-to-two-phase converter detects two-phase currents of three-phase stator currents, converts the stator currents into a γ-δ coordinate system to derive a γ-axis current and a δ-axis current. The γ-axis current, the δ-axis current, a... | 06/05/2001 |
| 6239576 | Safe Class-2 motor control circuit and method adapted for electric vacuum cleaning system suction motor and agitator motor control A control circuit for selectively energizing at least one electrical device coupled to the control circuit via a pair of conductive wires with an operating voltage. The control circuit comprises a control circuit for selectively supplying and withholding ... | 05/29/2001 |
| 6232730 | Brushless motor driving circuit and a method of controlling the brushless motor driving circuit In a brushless motor driving circuit of the invention, in the starting operation, an applying voltage is low and also the induced voltage is low, so that output values from sample and hold circuits 6 and 7 are substantially equal to each other. Thus, an o... | 05/15/2001 |
| 6229278 | Voltage and current limiting method and apparatus for a voltage/frequency drive A method and apparatus for maintaining both a DC bus voltage and a motor current within limit values wherein, when a voltage limit condition occurs, a voltage error (i.e. DC bus voltage limit minus DC bus voltage) is used to increase an inverter output fr... | 05/08/2001 |
| 6208112 | Method for controlling a voltage/frequency converter controlled single-phase or polyphase electric motor The method for controlling a voltage/frequency converter controlled single-phase or polyphase electric motor evaluates the phase shifting between the EMF and BEMF by way of the deviation between the zero crossing of the phase current and the voltage produ... | 03/27/2001 |
| 6201369 | SCR protection from stalled motor without current sensing A motor controller controls a motor operated by an AC line voltage. The controller includes an SCR connectable between an AC line and a motor terminal for controlling application of AC line voltage to the motor. A voltage sensor is operatively associated ... | 03/13/2001 |
| 6199023 | System for removing spurious signatures in motor current signature analysis A method for removing spurious signals in a process of motor current signature analysis of an electric motor (24 or 33) includes creating an electronic model of the motor, acquiring simultaneous measurements of voltage and current at the motor, applying t... | 03/06/2001 |
| 6194864 | Control device for induction motor An induction motor control device includes a power conversion circuit, a current sensor, a current component calculation circuit for calculating first and second current components, a magnetic flux command calculation circuit for calculating a magnetic fl... | 02/27/2001 |
| 6184645 | Voltage mode drive for control circuit for an actuator using sampled back EMF control An apparatus for controlling an actuator in response to a target speed voltage signal, the actuator having a moveable member and having a coil that influences movement of the member. A first summing node is provided having a control output voltage, for su... | 02/06/2001 |
| 6184638 | Control system for an induction motor An estimated rotation angular velocity .quadrature.r0 and an estimated secondary resistance Hr0 are processed using a first feedback gain H1 under a condition that a first state deviation E1 is in phase with a quadrature component of an estimated secondar... | 02/06/2001 |
| 6144198 | System and method for determining rate of rotation using brushless DC motor A system and method are provided for measuring rate of rotation. A brushless DC motor is rotated and produces a back electromagnetic force (emf) on each winding thereof. Each winding's back-emf is squared. The squared outputs associated with each winding ... | 11/07/2000 |
| 6141494 | DC motor driven power steering system for a motor vehicle A DC motor driven power steering system for a motor vehicle includes a motor current detection circuit for detecting a motor current flowing through the DC motor, a power supply voltage detection circuit for detecting a power supply voltage applied to the... | 10/31/2000 |
| 6124697 | AC inverter drive A drive for controlling the speed of an AC induction motor from an inverter. The inverter applies a voltage to the stator winding of the motor in accordance with the magnitude of a first input signal. The inverter causes the voltage to be applied at a fre... | 09/26/2000 |
| 6121748 | Method and apparatus for controlling an induction motor In an inverter controlling method for an induction motor, the slip of the motor is detected and an optimum slip which is dependent on the motor constant and the frequency supplied to the motor providing the highest efficiency is calculated, and a voltage ... | 09/19/2000 |
| 6104177 | Three-phase power controller with interrupt-controlled phase-gating control The three-phase power controller is provided which has interrupt-controlled phase-gating control with a simple, cost-effective design. The power controller uses of a single microcontroller with only one or two interrupt inputs. This is made possible by fo... | 08/15/2000 |
| 6094022 | Low jitter zero crossing BEMF detector and motor incorporating the same A BEMF detector and method detect the BEMF of a three-phase motor using a fully differential detection system. The motor has a first coil coupled between a first coil tap and a center tap, a second coil coupled between a second coil tap and the center tap... | 07/25/2000 |
| 6087801 | Process for controlling a rotating machine, a servocontrol system for implementing said method and a rotating machine provided with a system of this kind In a process for controlling a rotating machine having n phases powered by a voltage inverter defining mn states of the stator phase voltage vector the electromagnetic torque .GAMMA. and the stator flux |$c;s | of the machine are ... | 07/11/2000 |
| 6081083 | Switched reluctance motor In a switched reluctance motor and control system for such a motor, a rotor comprises four salient poles each having a width of about 50-degrees, and a stator has six salient poles each having a width of about 30-degrees. One Excitation winding is mounted... | 06/27/2000 |
| 6040671 | Constant velocity control for an actuator using sampled back EMF control An apparatus for controlling an actuator having a moveable member and having a coil that influences movement of the member, by provision of a drive current to the coil in response to a target speed voltage signal. The invention includes an up/down counter... | 03/21/2000 |
| 6037742 | Method for the field-oriented control of an induction motor A method for the field-oriented control of an induction motor (2) by means of a frequency converter (1) is disclosed, in which method a transformation angle (δ) is determined by estimation and is corrected in dependence on a rotational speed (ωmR | 03/14/2000 |
| 6018225 | Method and apparatus for reconnecting a rotating motor to a motor drive A motor is reconnected to a motor drive by exciting the motor to induce a back EMF, determining a speed of rotation of the motor based on the induced back EMF induced, and reconnecting the motor drive to the motor based on the speed determined. In order t... | 01/25/2000 |
| 6014007 | Method and apparatus for starting an AC drive into a rotating motor A method and apparatus for starting a motor drive into a rotating motor, the method including determining an initial search frequency and search current wherein the current is less than a rated drive current, providing a d-axis flux generating current to ... | 01/11/2000 |
| 6008614 | Synchronous motor with permanent magnets and motor system In a motor with permanent magnets and a motor system, the value produced by dividing, by the induced voltage constant ke, the product of the inductance Lm of the motor itself or the inductance Ls of the motor system in the d-q coordinate system is... | 12/28/1999 |
| 6008618 | Zero speed start-up for a speed sensorless induction motor drive An induction motor drive uses direct vector control for zero speed start up. According to the invention, a speed sensorless induction motor is controlled at all speeds, including zero or substantially zero speed, using direct vector control. In order to u... | 12/28/1999 |
| 6005784 | Voltage type inverter device and method of controlling the same A voltage-type inverter device includes a 1/2 V(DC) detecting circuit (31) for detecting a voltage between one end of a DC power supply (3) and an output from an inverter circuit (4); a voltage command value setting means (29) for commanding an output vol... | 12/21/1999 |
| 5998959 | Regulator device for an asynchronous machine used in particular as a drive for electric vehicles A control apparatus for an asynchronous machine, in particular as a drive for electric vehicles, is equipped with an incremental transducer for the rotation speed of the asynchronous machine and a torque setpoint transducer, the signals of which can be de... | 12/07/1999 |
| 5973474 | Vector control apparatus method for induction motor using magnetic flux observer of full order In a vector control apparatus and method for an induction motor, a magnetic flux observer of a full order is provided for receiving a primary voltage vector (v1) and a primary current vector (i1) and for generating a vector related t... | 10/26/1999 |
| 5965995 | Transient inductance tuner for motor control A method and apparatus used with a field oriented motor controller for providing corrected transient inductance estimates during normal motor operation. The invention monitors q-axis feedback and command voltages and, based on an error therebetween, modif... | 10/12/1999 |
| 5959430 | Power conversion system A power conversion system, including a converter for converting an AC power from a power source to a DC power, a DC capacitor for smoothing the DC power output from the converter, an inverter for converting the DC power smoothed by the DC capacitor to an ... | 09/28/1999 |
| 5945802 | Ground fault detection and protection method for a variable speed ac electric motor A method and apparatus for detecting the presence of a ground leakage path in an electric motor system including an alternating current (ac) electric motor coupled for receiving electric power from a switching inverter of the type having, for each phase o... | 08/31/1999 |
| 5923144 | Frequency generator for a motor controller A method for generating electrical frequencies of a alternating current motor is disclosed wherein a torque current command signal, a d-axis voltage command signal and a d-axis voltage feedback signal are combined to generate the stator electrical frequen... | 07/13/1999 |
