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| Number | Title | Issue Date |
| 8148927 | Alternating-current motor control apparatus A control apparatus for an alternating-current motor that is driven by an inverter includes a rectangular wave voltage control portion that generates a control command of the inverter such that rectangular wave voltage that has been phase-controlled to make the alte... | 04/03/2012 |
| 7723945 | Control device for motor drive system and electric vehicle including the same A square wave voltage having an amplitude equal to an output voltage of a converter is applied to an AC motor by a square wave control block. Torque control of the AC motor is performed basically by changing the voltage phase of the square wave voltage according to ... | 05/25/2010 |
| 7443130 | Motor driving control device In a motor driving control device, a high-frequency alternating voltage or rotation voltage (having a frequency of ωh) is applied to a motor so that magnetic saturation occurs in the motor, thereby extracting, from a γ-axis current, a high-frequency sec... | 10/28/2008 |
| 7411369 | Phase current detection method, inverter control method, motor control method and apparatus for carrying out these methods Apparatus and methods for phase current detection used for driving a motor by supplying outputs from a pulse width modulation (PWM) converter to the motor. One method presented provides detecting a DC link current and a vector pattern, determining whether a voltage ... | 08/12/2008 |
| 7411370 | Vector controller of induction motor Provided is a vector control apparatus for an induction motor which is capable of obtaining stable rotation in a short period of time for adjustment even at the time of low-speed operation by increasing the SN ratio of an output voltage to suppress the arithmetic er... | 08/12/2008 |
| 7402977 | Apparatus and method for controlling operation of reciprocating motor compressor An apparatus for controlling an operation of a reciprocating motor compressor includes a current integrator for integrating an alternating current applied to a motor of the compressor during each one cycle thereof; and a controller for differently controlling a firi... | 07/22/2008 |
| 7398864 | Elevator controller In an elevator control apparatus, a power supply voltage monitoring circuit monitors a power supply voltage supplied to a processing portion. A voltage monitoring soundness checking function circuit outputs a monitoring input voltage forcible change signal for forci... | 07/15/2008 |
| 7394629 | Motor overload tripping system and method with multi-function circuit interrupter A technique is provided for controlling operation of motors of different sized or ratings. Components used to apply and interrupt current to the motors may be shared in control devices for the different motors. The components may include contactors or circuit interr... | 07/01/2008 |
| 7372233 | Method for operation of a converter circuit for a washing machine or a washer/drier, converter circuit, and washing appliance or washer/drier A method is provided for operating a converter circuit, in particular a pulse-width modulated frequency converter circuit having a DC voltage intermediate circuit, which controls two or more winding sections of a polyphase dynamo-electrical machine, in particular a ... | 05/13/2008 |
| 7362063 | Motor spindle control system and method In a method for measuring motor speed and position by detecting the back-EMF generated during pole-pair interactions, fluctuations of a three-phase motor power supply that may affect back-EMF detection are reduced. One phase of the power supply is tristated for a ce... | 04/22/2008 |
| 7362069 | Voltage source inverter control method A simple and accurate dead time dispersion measurement method and a voltage source inverter control method that can prevent the occurrence of an unstable phenomenon are provided. The control method controls a voltage source inverter of a PWM system, which inc... | 04/22/2008 |
| 7358700 | Induction motor controller An induction motor controller that may include three phase paths leading from a power input to a power output, a solid-state switching device interposed between the power input and the power output on each of the three phase paths, a voltage sensor coupled to two of... | 04/15/2008 |
| 7339346 | Motor and drive control device therefor The invention provides a motor for a brushless DC motor, which has small torque ripple even if a trapezoidal wave current is supplied and has a small size and reduced motor noise, and a drive control device for the motor as well as an electric power steering apparat... | 03/04/2008 |
| 7339631 | Apparatus and method for correcting color error An apparatus and method for correcting a color error are provided. The apparatus includes, a color wheel having a CWIM marked thereon, a motor for rotating the color wheel, a motor driver for controlling a driving of the motor, a CWIM sensor for sensing the CWIM to ... | 03/04/2008 |
| 7332888 | Driving apparatus for a motor A motor driving apparatus includes: a current instruction calculator, for calculating a current instruction value based on a deviation between a speed instruction value and an estimated speed value; a current controller, for controlling an output current based on th... | 02/19/2008 |
| 7327118 | Electric machine and method of operating the electric machine A method of and apparatus for controlling an electric machine. The method can include using a controller to detect whether power is present at a first node of the controller, detect whether power is present at a second node of the controller, generate at least one s... | 02/05/2008 |
| 7304451 | Motor control apparatus and method for generating modulation wave instruction of PWM inverter of the same motor control apparatus A motor control apparatus capable of expanding a voltage output and a modulating wave signal generating method for a PWM inverter apparatus of the motor control apparatus, which is controlled by a pulse width modulating signal obtained by comparing a modulating wave... | 12/04/2007 |
| 7301301 | Electric car control apparatus In an electric car control apparatus for driving an induction motor, detection accuracy of a DC voltage is improved. A DC power supply device is provided which has a maximum potential terminal A, an intermediate potential terminal B, a minimum potential terminal C, ... | 11/27/2007 |
| 7299708 | Rotor angle estimation for permanent magnet synchronous motor drive A method of determining a rotor angle in a drive control for a motor, comprising the steps of (a) determining a rotor magnetic flux in the motor; (b) estimating the rotor angle on the basis of the rotor magnetic flux; and (c) correcting the estimated rotor angle on ... | 11/27/2007 |
| 7294989 | Frequency converter overvoltage protection A method of protecting a frequency converter against overvoltage by controlling an AC motor during braking or during light load and a frequency converter, wherein the frequency converter is a voltage-controlled PWM frequency converter operating in single quadrant ( | 11/13/2007 |
| 7292004 | Motor driving apparatus A motor driving apparatus for driving a motor includes a single-phase rectifier circuit having an input connected to a single-phase AC power supply, an inverter circuit that is connected to the single-phase rectifier circuit and applies a current and a voltage to th... | 11/06/2007 |
| 7282887 | Laser diode triggered soft start controller for a polyphase electric motor A solid state soft start controller system has a power supply, an electric motor, a thyristor electrically interconnected between the power supply and the electric motor so as to selectively allow current to pass from the power supply to the phases of the electric m... | 10/16/2007 |
| 7276877 | Sensorless control method and apparatus for a motor drive system A method and apparatus provide a state observer control system 600 for a motor 106 that uses an extended Kalman filter 330 to predict initial rotor position and afterwards accurately predict rotor position and/or speed under variable types of lo... | 10/02/2007 |
| 7271557 | AC motor driving apparatus and method of controlling the same The AC motor driving apparatus comprises an inverter for supplying power to an AC motor, current sensors for detecting current that flows in the motor or inverter, a rotation sensor for detecting the rotation of the rotor in the motor, and a control unit for control... | 09/18/2007 |
| 7265516 | Linear electric motor controller and system for providing linear control The invention relates to a method of, and system for, linear speed control for an electric motor, in which a digital to analog converter means is used for converting an 8-bit digital signal to an analog voltage for setting voltage across a motor, a digital state mac... | 09/04/2007 |
| 7262578 | Direct control of an induction motor This invention relates to sensorless control (i.e. without encoder at the motor shaft) of an induction motor (AC asynchronous motor). In particular, the invention comprises a method for a direct measurement of the electromotive forces (EMF) at the stator of the moto... | 08/28/2007 |
| 7250733 | Circuit arrangement and method for controlling a brushless, permanently excited direct current motor The invention relates to a circuit arrangement for self-commuting control of a brushless, permanently excited direct current motor. Said circuit arrangement determines the commutation interval by evaluating the induction signal of a signal phase. A capacitive interf... | 07/31/2007 |
| 7245104 | Position-sensorless motor control device A position-sensorless motor control device has a superposer that superposes, on the drive current with which the motor is driven, a superposed current having a different frequency than the drive current, a superposed component extractor that extracts, from the motor... | 07/17/2007 |
| 7240761 | Electric power steering apparatus In a current control system for a cylindrical permanent magnet synchronous motor as the drive source of an electric power steering apparatus, proportional gain Kdp and integral gain Kdi of a d-axis current PI control portion 126 are respectively set to K1·Ld... | 07/10/2007 |
| 7242163 | System and method for clamp current regulation in field-weakening operation of permanent magnet (PM) machines A device to regulate current produced by a permanent magnet machine responsive to a plurality of phase current signals. The motor produces torque for application on a shaft. A processing and drive circuit responsive to a direct current command signal and a quadratur... | 07/10/2007 |
| 7242175 | Determining rotation of a freewheeling motor A device and method that determine a freewheeling rotation of an electric motor. The method includes steps of measuring first and second signals from respective first and second windings of an unenergized motor, and determining from the first and second signals whet... | 07/10/2007 |
| 7239098 | Digital adaptive sensorless commutational drive controller for a brushless DC motor Various embodiments of an electrical motor, a brushless DC motor controller, and applications thereof. In one embodiment, a fluid-moving device is provided with a brushless DC motor and a motor controller. The controller may include a set of comparators and a clocke... | 07/03/2007 |
| 7236020 | Pulse translation method from low to high voltage level in half and full bridge application A switched bridge circuit comprises a first switch, a second switch, and a non-overlapping pulse generator. The first switch is coupled to a load. The second switch is coupled to said load. The non-overlapping pulse generator is coupled to the first switch and the s... | 06/26/2007 |
| 7230403 | System and method for elimination of DC offset feedback in AC drives A DC offset compensation system and method significantly reduce a DC offset voltage in the voltage feedback loop of an AC motor drive control system. A control voltage error signal is demodulated and filtered and applied to the closed loop voltage feedback signals t... | 06/12/2007 |
| 7227331 | Safety interlock and protection circuit for permanent magnet motor drive A circuit for protecting against controller failure wherein the controller provides control signals for controlling a DC to AC inverter fed by a DC bus and driving a permanent magnet motor, the circuit comprising a first circuit for monitoring the DC bus voltage and... | 06/05/2007 |
| 7224133 | Control apparatus, dual chip inverter and single chip inverter of AC motors A control apparatus and a semiconductor apparatus of AC motors capable of reducing torque ripple with a comparatively simple circuit corresponding to a high withstand voltage and capable of driving a motor at high efficiency even when the rotational speed or load ha... | 05/29/2007 |
| 7221117 | Method and system for controlling an electric motor in the event of flux reduction The present invention relates to a method and a system for correcting references (xref), in the case of flux reduction, used in a speed variator for controlling an electric motor M having a three-phase supply, for example of the synchronous or asynchronou... | 05/22/2007 |
| 7211984 | Start-up and restart of interior permanent magnet machines A method of starting a permanent magnet machine. A machine stator voltage in a stationary reference frame is sensed. An initial speed of a rotor of the machine is estimated based on the sensed voltage, and state variables of control algorithms are initialized based ... | 05/01/2007 |
| 7208908 | Apparatus and method to control torque and voltage of an AC machine A method of controlling a power converter (258) of a synchronous machine drive system (100) determines position and speed of a rotor (350) of the synchronous machine (300); regulates a current vector relative to a reference frame, having ... | 04/24/2007 |
| 7202617 | Circuit and method for controlling brushless DC motor A circuit for controlling a brushless permanent magnet motor is provided. The circuit comprises windings, each of the windings having a first end connected at a common node and each of the windings having a second end connectable directly to supply voltages by switc... | 04/10/2007 |
