Matches 1 - 50 out of 143 1 2 3 >


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US20150128660 MOTOR DRIVING APPARATUS AND LAUNDRY TREATMENT MACHINE INCLUDING THE SAME  
The laundry treatment machine includes an inverter to convert direct current (DC) voltage into alternating current (AC) voltage and to output the AC voltage to a motor. The laundry treatment...
US20120060290 BRUSHLESS DC MOTOR BRAKING FOR A BARRIER FREE MEDICAL TABLE  
A braking action of movement of a support surface on an examination may be accomplished with a motor. The examination table includes a base, a support surface moveable with respect to the base,...
US20120217917 METHOD AND DEVICE FOR CONTROLLING AN ELECTRIC MOTOR  
A method and device for controlling an electric motor, in particular a machine tool drive, wherein during a sensorless open-loop control mode of operation of the electric motor the speed and the...
US20110095713 METHOD AND SYSTEM FOR INITIATING OPERATION OF AN ELECTRIC MOTOR  
Methods and systems for controlling an electric motor are provided. The motor includes a plurality of windings. Each winding is coupled to a respective set of first and second switches. The first...
US20130057185 METHOD FOR STARTING A SYNCHRONOUS MACHINE  
In a method for starting a synchronous machine, a default torque is predefined, and a rotational speed of the synchronous machine is adjusted after starting. A torque which is higher than the...
US20120074882 STARTUP CONTROL CIRCUIT OF DRIVE CIRCUIT  
Startup of motor is reliably executed and sonic noise is reduced. A control circuit controls a selector to apply control to output a full-drive waveform at startup and then output a PWM modulation...
US20150180391 MOTOR CONTROL CIRCUIT AND METHOD  
In accordance with an embodiment, a drive circuit is provided for driving for a motor wherein the drive circuit includes a rotational state generation circuit connected to a state controller. The...
US20150128658 MOTOR DRIVING APPARATUS AND LAUNDRY TREATMENT MACHINE INCLUDING THE SAME  
A laundry treatment machine includes a drum, a motor to rotate the drum, and a driving unit to drive the motor, wherein the driving unit includes an inverter to convert direct current (DC) voltage...
US20110121768 MOTOR STARTING CONTROL METHOD, MOTOR DRIVING SYSTEM AND MOTOR SYSTEM  
A method for controlling starting of a motor is described, which is mainly applicable to estimate a possible initial position of a rotor of a motor by detecting a rotor rotation signal of the...
US20140152212 METHOD FOR SMOOTH MOTOR STARTUP  
A method of conducting smooth motor startup is provided and includes operating a motor in an open loop control scheme at startup, operating the motor in a closed loop sensorless control scheme at...
US20110025243 ROBUST ROTATIONAL POSITION ALIGNMENT USING A RELATIVE POSITION ENCODER  
A robust method for detecting a relative position of a feedback device, such as an encoder or resolver, coupled to a shaft, such as a motor shaft, is provided. To detect the relative position,...
US20140327379 POSITION SENSORLESS DRIVE SYSTEM AND METHOD FOR PERMANENT MAGNET MOTORS  
A position sensorless drive systems for a permanent magnet motors are disclosed. An embodiment includes a square wave voltage source connectable to an input of a permanent magnet motor. At least...
US20120043919 Pulse Amplitude Modulation Method for the DC Brushless motor  
A method of the Pulse Amplitude Modulation for the Sensorless Brushless motor, which includes a start-up circuit, a phase detect circuit, a phase commutation circuit, a driving circuit, BEMF...
US20130134912 Switched Reluctance Machine Natural Transition between Current Regulation and Single Pulse Operation  
A method of controlling a motor is provided. The method may monitor a plurality of operational characteristics of the motor, determine an optimum transition speed of the motor based on the...
US20120319631 SENSORLESS MOTOR CONTROL USING THE RATE OF CHANGE OF THE INDUCTIVE RISE TIME  
A conventional method used for a startup mode for a brushless direct current (DC) motor employed complementary inductive rise times. Specifically, inductive rise times rise times for a driving...
US20140117894 METHOD FOR STARTING AN ELECTRIC MOTOR  
A method for starting an electric motor, the motor having a main machine, exciter, and permanent magnet generator (PMG), each having a stator and a rotor, with each rotor mounted to a common...
US20110181216 SPEED-DEFINED TORQUE CONTROL  
Motors, such as DC motors, and methods and systems for operating a motor, are described. The motor is optionally an electronically commutated motor. The motor comprises one or more electromagnets...
US20130257326 METHOD FOR OPERATING A BRUSHLESS ELECTRIC MOTOR  
A method for starting a multiphase, sensorless commutated, brushless electric motor. The method has three operating phases. A start-up phase in which the motor is operated from a standstill with...
US20110115421 System and Method for Inducing Rotation of a Rotor in a Sensorless Motor  
System and method for initiating rotation of a rotor in a motor. The motor may include the rotor and a plurality of pairs of electromagnets. A rotation period may be determined. One or more pairs...
US20080116829 Efficient AC circuit for motor with like number of poles and magnets  
Simple AC circuitry driving a brush-less motor having a rotor consisting of alternate polarity permanent magnets poles, with the rotor journaled in a stator with a like number of wound poles...
US20140055064 Systems and Methods for Controlling Motor Speeds  
Electronic circuits for controlling the speed of a motor include a receiving node coupled to receive a speed command signal representative of a desired final speed of the motor. A speed control...
US20110012545 METHOD FOR CONTROLLING A MULTIPHASE ELECTRIC MOTOR OPERATING IN STAR-CONNECTED MODE  
A method serves for starting a polyphase electric motor which is operated in a star connection. The method conductively bridges at least one winding part of a phase of the motor and electrically...
US20130342142 System And Method for Permanent Magnet Motor Control  
A method of operating an electric motor is disclosed. The method includes: starting the electric motor in an open loop control mode; operating an estimator that estimates operating conditions of...
US20100072936 Simultaneous zero verification for motors in a printing press  
A method for determining accuracy of an actual position of a plurality of independent motors in a printing press is provided. The method includes commanding each of the plurality of motors in the...
US20150128661 MOTOR DRIVING APPARATUS AND LAUNDRY TREATMENT MACHINE INCLUDING THE SAME  
The laundry treatment machine; absent a position sensor to sense a rotor position, includes a driving unit having a DC/AC inverter, an output voltage detection unit to detect output voltage...
US20120062011 BRUSHLESS DC MOTOR STARTS FOR A BARRIER FREE MEDICAL TABLE  
A boot-strap capacitor pre-charge algorithm prevents unwanted motions in an examination table using a brushless direct current motor. The motor is supplied with power by a motor drive circuit...
US20140340008 Electronic Circuit and Method for Adjusting Start-up Characteristics of Drive Signals Applied to an Electric Motor  
A motor control circuit and associated techniques can drive an electric motor in a start-up mode of operation followed by a normal mode of operation. The motor control circuit and techniques can...
US20100060217 Brushless motor starting method and control device  
For starting a three-phase four-pole sensorless brushless motor including a stator having three-phase coils and a four-pole magnet rotor provided in correspondence with the stator, it is arranged...
US20100052584 INCREASING TAPE VELOCITY BY DYNAMIC SWITCHING  
An apparatus for controlling an electric motor is provided. A plurality of switches is provided for controlling a direction of current through motor coils of the electric motor. A brushless motor...
US20110291597 Method for Aligning and Starting a BLDC Three Phase Motor  
System and method for aligning and initiating rotation of a rotor in a motor. The motor may include the rotor and a plurality of pairs of electromagnets. The energy needed for alignment of the...
US20100278660 Integral Compressor Motor And Refrigerant/Oil Heater Apparatus And Method  
A compressor apparatus includes a power source (26), a shell (12; 42), an electric motor (28; 52; 100; 200) having motor windings, and a control assembly (106; 206). The electric motor (28; 52;...
US20150069941 Three-Phase Synchronous Motor Drive Device  
A three-phase synchronous motor drive device includes: a three-phase inverter 3 that drives a motor 4 that is as a three-phase synchronous motor, and that includes switching elements for three...
US20130200826 MOTOR CONTROL APPARATUS  
A motor control unit determines whether a rotor of an electric motor is in rotation or not after the motor control unit is started up but before an initial operation, based on an encoder count...
US20120242265 Method for operating an electric machine, and drive device  
In a method for operating an electric machine of a drive device, which electric machine has a rotor and a stator, and which drive device has a drive unit, an angular position of the rotor with...
US20150128662 MOTOR DRIVING APPARATUS AND LAUNDRY TREATMENT MACHINE INCLUDING THE SAME  
The laundry treatment machine, absent a position sensor to sense the rotor position of a motor, includes a driving unit having an DC/AC inverter, an voltage detection unit to detect output...
US20130134913 System and Method for Aligning a Resting Rotor to a Known Position  
A system and method are presented for aligning a rotor in a motor. The motor may include the rotor and a plurality of pairs of electromagnets. One or more pairs of electromagnets may be excited at...
US20150207447 MOTOR DRIVE CONTROL DEVICE  
A motor drive control device uses a rotor position sensorless control scheme to drive a motor. The motor drive control device includes a rotational speed deriving component, a startup component...
US20120098472 ENGAGEMENT OF A SPINNING AC INDUCTION MOTOR  
A mechanism for a motor controller for engaging a spinning motor is provided. A power section is configured to provide power to the motor. A control is configured to control the power section. The...
US20110031914 CONTROLLER AND METHOD FOR TRANSITIONING BETWEEN CONTROL ANGLES  
A system includes a pulse-width modulation (PWM) module, a subtraction module, an error reducing module, and a summing module. The PWM module controls switching of an inverter that powers a motor....
US20090189556 MOTOR DRIVE DEVICE AND SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE  
The disclosed invention achieves a significant reduction in the noise and vibration of a brushless motor from a startup up to the number of steady revolutions. To drive the brushless motor from...
US20120274249 ELECTRICAL MACHINE, METHOD OF CONTROLLING AN ELECTRICAL MACHINE, AND SYSTEM INCLUDING AN ELECTRICAL MACHINE  
A method of controlling an electrical machine. The electrical machine includes a stator having a core and a plurality of windings, and a rotor disposed adjacent to the stator to interact with the...
US20130015794 CLOSED LOOP STARTUP CONTROL FOR A SENSORLESS, BRUSHLESS DC MOTOR  
A method for driving a brushless direct current (DC) motor is provided. The brushless DC motor has a first phase that is coupled between a first terminal and a common node, a second phase that is...
US20110006712 ONE-PHASE BRUSHLESS MOTOR  
An electronically commutated one-phase motor (20; 20′) has a stator having at least one winding strand (30, 32; 30′), and it has a permanent-magnet rotor (22) that induces, as it rotates, a...
US20120326643 Position Corrected Pulse Width Modulation for Brushless Direct Current Motors  
A method of operating a brushless direct current motor is provided that generates a rotor position dependent pulse width modulation waveform. The waveform can improve motor efficiency and reduce...
US20140077734 CONTROL SYSTEM FOR BRUSHLESS MOTOR  
A motor controller is configured to perform positioning of a rotor of a brushless motor immediately when power supply is turned on, and not after actually receiving a target value related to...
US20140340009 Electronic Circuit and Method For Synchronizing Electric Motor Drive Signals Between a Start-up Mode of Operation and a Normal Mode of Operation  
A motor control circuit and associated techniques can drive an electric motor in a start-up mode of operation followed by a normal mode of operation. The motor control circuit and techniques can...
US20090167219 Motor Drive Circuit, Fan Motor, Electronic Device, and Notebook Personal Computer  
A motor drive circuit includes: a pulse generation circuit configured to generate a pulse signal whose duty ratio of one logic level is increased as a drive voltage is increased in accordance with...
US20130069571 BRUSHLESS MOTOR DRIVE DEVICE  
A brushless motor drive device switches energization modes for supplying power to two phases of a three-phase brushless motor, based on an induced voltage induced in a non-energized phase. In a...
US20140176030 MOTOR DRIVE APPARATUS  
A motor drive apparatus comprises: a position signal generation portion that generates a position signal corresponding to a rotor position of a brushless DC motor; and a logic portion that when...
US20120038298 Apparatus And Method For Rotating-Sensorless Identification Of Equivalent Circuit Parameters Of An AC Synchronous Motor  
Identification without shaft encoder of electrical equivalent circuit parameters of a three-phase asynchronous motor comprising: standstill position search of the rotor, so that the d flux axial...

Matches 1 - 50 out of 143 1 2 3 >