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Class 318/779 - With speed control


Subclass of Class 318 - Electricity: motive power systems
Definition: Subject matter wherein means are provided for controlling
No. of patents: 143
Last issue date: 05/08/2012


1        
NumberTitleIssue Date
8174219Motor control unit and air conditioner having the same
A motor control unit or a semiconductor integrated circuit device for an air conditioner is provided. The motor control unit includes a current detector that detects a coil wound current of the permanent magnet motor; a coordinate transformer that transforms the coi...
05/08/2012
8138709Control method and system
Systems, methods, and devices are disclosed, including an induction-motor controller that has a motor controller configured to receive alternating current (AC) power with a voltage that varies generally sinusoidally and transmit the AC power during a conduction angl...
03/20/2012
7834577System and method for starting a wound rotor motor
A system and method for starting and regulating a wound rotor motor (120) including a phase-controlled SCR converter (150) and a drive circuit (130, 140) having a voltage source inverter (140) and a voltage source converter (130). ...
11/16/2010
7570009Fan system and its control device and control method
A control device of a fan system, which has at least one fan, receives a starting voltage. The control device includes a start controlling unit and a driving unit. The start controlling unit receives the starting voltage and outputs a start controlling signal accord...
08/04/2009
7525278Voltage conversion apparatus, power output apparatus, and control method of voltage converter
An upper limit value setting unit of a control device conducts integration on the change in battery power, and determines whether the integrated value is lower than a preset first threshold value (negative value). When determination is made that the integrated value...
04/28/2009
7417389Speed control for an electric motor
A system and method for controlling a rotational speed associated with a shaft or rotor of an electric motor comprises establishing a target rotational speed associated with a shaft or rotor of an electric motor. A sensor detects an actual rotational speed associate...
08/26/2008
7362070Electric motor control system including position determination and error correction
A system for controlling an electric motor includes a controller and a position indicator that provides position information regarding at least one motor component to the controller. The controller utilizes phase relationships indicative of the position information ...
04/22/2008
7345449Method of rotating a polyphase motor at less than rated speed
A polyphase AC induction motor is connected to a power supply through a soft starter having three sets of inverse parallel connected silicon controlled rectifiers with each set corresponding to one particular phase. Low speed starting and operation of the motor can ...
03/18/2008
7342367Motor drive circuit, motor system, and motor drive method
A circuit suitable for formation as a small sized IC, able to decrease the number of externally attached parts and reduce the size, and stably rotating a motor. When rotating a rotor 101 by three-phase drive signals U, V, and W generated based on a CLK signal...
03/11/2008
7327118Electric 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
7327378Laser scanning unit
A laser scanning unit includes a housing; an optical system disposed in the housing and including an optical source which emits a laser beam, a polygonal mirror which scans the laser beam, and a plurality of optical elements which image the laser beam on an image su...
02/05/2008
7315147Motor and motor drive system
Provided is a motor having a combination of a plurality of coil pairs and a permanent magnet, wherein these coil pairs are supplied with an excitation signal from a drive circuit so as to be excited at alternate opposite poles, and the permanent magnet is constitute...
01/01/2008
7291995Air fan rotation speed control method and structure thereof
An air fan rotation speed control method and a structure thereof aim to provide an automatic control mode and a manual control mode at the same time to control rotation speed regulation of an air fan to achieve instant heat dissipation for an environment and reduce ...
11/06/2007
7265506Noise improved linear DC motor control systems and methods
A linear power controller and related circuitry may be implemented to provide linear control of a variable DC electric motor. The controller and motor are coupled to form a closed loop for controlling the speed of the motor and for adjusting or compensating for nois...
09/04/2007
7260452Apparatus, method and computer program product for monitoring AC line current through the step start resistors of a high voltage power supply
A circuit to monitor ac line current through resistors employed to provide a ‘step start’ in a power supply, including means to monitor the current flowing through the step start resistors, comprising a peak detector, a sample and hold circuit, an analog to digi...
08/21/2007
7253548Method and apparatus for controlling an electric machine
The invention provides a method and apparatus for controlling a machine in which the magnetic flux emanating from a rotor is selectively diverted to a second path in the stator which bypasses the winding or windings so as to magnetically de-couple the winding or win...
08/07/2007
7227326System and method for transient-based motor speed estimation with transient excitation
AC motor control systems and speed controllers are presented, including a transient-based speed estimation system that provides a rotor speed estimate based on a measured speed-related motor transient signal, and a transient excitation system which selectively modif...
06/05/2007
7218075Electronic circuit for starting a single phase induction motor
An electronic circuit for starting a single phase induction motor, of the type containing a rotor and a stator with at least one running coil (B1) and one starting coil (B2), for operating jointly with an alternating current source (F), comprising: a t...
05/15/2007
7208908Apparatus 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
7199538Motor driving system
A motor driving system for an electric motor includes a pulse width modulating circuit which provides driving pulse signals whose pulse width is modulated to have a prescribed duty ratio, an inverter having PWM-controlled switch elements, a voltage calculating circu...
04/03/2007
7196491System and method for stall detection of a motor
A motor starter system comprises solid state switches for connection between an AC line and motor terminals for controlling application of AC power to the motor. A voltage sensor senses AC line voltage and the motor terminal voltage. Current sensors sense motor curr...
03/27/2007
7187155Leakage inductance saturation compensation for a slip control technique of a motor drive
An electronic drive for vector control of an induction motor controls slip and operating frequency in response to changes in stator voltage. The drive includes a torque control loop, a flux control loop and a frequency control loop. The control is based on a command...
03/06/2007
7173393Phase current detection method, inverter control method, motor control method, and apparatuses used in 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 ...
02/06/2007
7159409Method and apparatus for controlling the load placed on a compressor
A method of operating a vapor compression system, the vapor compression system defining a closed fluid circuit in which a refrigerant is circulated and having operably disposed therein, in serial order, a compressor, a high pressure heat exchanger, an expansion devi...
01/09/2007
7161316Method and apparatus for discrete speed compensated torque step motor control
Methods and apparatus for controlling a motor are provided. The motor may be operated in a fluid system having a variable static pressure acting on the motor. The method including operating the motor at a first substantially constant torque level, varying the static...
01/09/2007
7161253Portable power source
A portable power source for starting a variety of outdoor power equipment. The portable power source generally includes a housing, an electrochemical power supply, a switch having an ON position with a fixed contact and a START position with a momentary contact, and...
01/09/2007
7148650Maximum power point motor control
A method and apparatus are implemented in software to control motor speed as a function of available power in a DC source-inverter-AC motor system, i.e. to perform maximum power tracking of motor speed. An inverter or motor drive converts DC power from a DC source, ...
12/12/2006
7141948Electromotive power steering system
An objective is to provide, in a motor controller used for an electromotive power steering system, a concrete realistic method for easily performing abnormality judgments in its control system. The electromotive power steering system includes: a d-q command value se...
11/28/2006
7138772Electrically movable vehicle and control program for driving electrically movable vehicle
The invention provides an electrically movable vehicle drivable by a simplified mode of control and a control program for driving the vehicle. A normalized value Y′ representing translation motion and a normalized value X′ representing turning motion are fed fro...
11/21/2006
7126294Method and device for controlling photovoltaic inverter, and feed water device
A photovoltaic inverter control method includes steps of monitoring a variation in output voltage of a solar battery by a power and voltage monitoring circuit (51) and, when the variation occurs, accelerating or decelerating an electric motor (3) to ma...
10/24/2006
7100721Hybrid vehicle drive control apparatus, hybrid vehicle drive control method, and program thereof
A hybrid vehicle drive control apparatus including an electric generator mechanically connected to an engine so as to have a differential rotation with respect to the engine, a generator brake for mechanically stopping a rotation of the generator and a controller th...
09/05/2006
7102309Apparatus for compensating for speed error of motor
The present invention discloses an apparatus for compensating for a speed error of a motor which can reduce a speed ripple of the motor resulting from load characteristics, and which also can reduce vibrations and noises. The apparatus for compensating for the speed...
09/05/2006
7091691Variable speed motor
An outer-rotor variable-speed motor, to which single-phase AC power is applied and on which a rotor is provided outside a stator, comprises first and second main windings provided on a stator of the motor to form a plurality of poles, a frequency detector for detect...
08/15/2006
7084598Driver of electric compressor
A compressor driver for a compressor is provided, wherein at the start of the compressor, a phase of the current flowing in the motor is controlled to be ahead of an induction voltage, then the advancement of the phase is controlled to decrease. Under an unstable co...
08/01/2006
7081748Magnetic resonance scanner with electromagnetic position and orientation tracking device
A system for combining electromagnetic position and orientation tracking with magnetic resonance scanner is provided. One embodiment includes a magnetic resonance scanner defining a reference coordinate system for scanning a target. Coupled to the magnetic resonance...
07/25/2006
7075260Motor controlling method and apparatus thereof
A voltage detection section and current detection section detect a voltage and current supplied to a motor, and the detected voltage and current are supplied to a position detection section. An angular speed output from the position detection section is supplied to ...
07/11/2006
7068009Drive arrangement, especially for a lifting mechanism and/or a traveling drive
The invention concerns a drive arrangement of a lifting gear and/or a traveling gear, with a pole-reversible rotary-current motor with windings for at least two different actuating speeds, with a pole switching element connecting the rotary-current motor to a voltag...
06/27/2006
7064517Motor driving apparatus for use in a dishwasher
An apparatus for driving a motor of a dishwasher includes an AC power source, a rectification circuit for converting an AC power from the AC power source to a DC power, an inverter circuit for converting the DC power from the rectification circuit to an AC power, a ...
06/20/2006
7047770Washing machine agitation action control
An apparatus, method and system of wash action control for an automatic washing machine. A manually operable user interface allows selection from between a plurality of discrete agitation speed selections which comprise at least a continuous speed agitation mode for...
05/23/2006
7049778Inverter control apparatus and inverter control method
An interrupt signal is generated at each of rising timings of PWM signals which are produced on the basis of phase-shifted triangular wave carrier signals for phases, and voltage command values for the phases. At timings of the interrupt signals, A/D conversion of m...
05/23/2006
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