Matches 151 - 200 out of 216 < 1 2 3 4 5 >

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7388341 Control system for permanent magnet synchronous motor and module  
A vector control system for a permanent magnet synchronous motor, using a current control equivalent output value, a frequency instruction value, a current detection value, an inference phase...
7385366 Method for controlling hydraulic brushless motor and controlling device  
The method for controlling the hydraulic brushless motor operates the hydraulic brushless motor by switching the conduction timing to a plurality of switching elements. The method for controlling...
7385365 Method for the detection of abnormalities of electric motors  
In a method for error detection of a brushless electric motor, at least one first motor parameter is measured or determined, and a second, estimated motor parameter is estimated on the basis of...
7239102 Phase adjustment circuit, motor driving control circuit, and motor apparatus  
A motor apparatus is constructed to compensate for a delay in operation of the motor apparatus, so that the efficiency is improved and noise is reduced over a broad motor rpm range by driving the...
7230400 Electronically commutated motor  
In an electronically commutated motor (M), rotor position signals are generated by means of a galvanomagnetic rotor position sensor (40). A timer (CNT_HL) brings about an advanced commutation...
7218846 Fan speed control circuit  
A fan speed control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a phase compensation unit. The PWM signal generating circuit generates a PWM...
7180256 Electronically controlled power steering system for vehicles and method and system for motor control  
A power steering device capable of obtaining a high rotary speed in the medium low torque range of an electric motor without incurring a drastic increase in manufacturing cost. The power steering...
7170243 Drive method for brushless motor and drive control apparatus therefor  
A drive method for a brushless motor and a drive control apparatus therefor, in which control parameters are calculated by revolution number control means or motor current control means in...
7067998 Drive circuit for brushless DC motors  
A drive circuit for brushless DC motors including a rotor and a stator with at least one stator coil includes a commutation device which supplies commutation pulses of drive current to the stator...
7030583 Method for the commutation of brushless direct current motor  
A method for the commutation of a brushless direct current motor having at least one motor winding in which the position of the rotor with respect to the stator is determined, a commutation signal...
6831430 High phase order motor with mesh connected windings  
A high phase order induction machine drive system is disclosed. This has an inverter system for the synthesis of a plurality of phases of alternating current output, and a N-phase induction motor...
6650073 Brushless motor apparatus  
A brushless motor apparatus includes a motor section including delta-connected three-phase coils; a switching section electrically connected to the motor section via a line; and a driving section...
6473562 Method for low-speed operation of brushless DC motors  
A method to operate an electronically commutated DC motor driving a centrifugal pump and comprising a stator fitted with at least one winding and a rotor fitted with permanent magnets, said method...
6469464 Automatic safety garage door closer  
An automatic door operating safety system particularly used with garage doors is provided. A security timer for a powered overhead garage door causes the door to close after it has been opened for...
6469465 Precision micro-motor position controller  
A micro-motor position controller utilizes a ratiometric position sensor that operates independent of any reference voltage sources. A first capacitor and a second capacitor in a micro-motor are...
6469468 SR motor controlling method and SR motor having low peak of current flowing therein  
An SR motor includes a stator having a plurality of salient poles and a rotor having another plurality of salient poles. Windings are wound around the plurality of salient poles and magnetic...
6465975 Method and system for controlling torque in permanent magnet brushless electric motors  
A novel method is proposed for controlling the torque of a PM brushless motor with sinusoidal back-emfs without current sensors by computing the required input phase voltages with measured rotor...
6465977 System and method for controlling torque in an electrical machine  
System and method for controlling the output torque of an electrical machine include a torque controller operable for receiving a motor input command, representative of a desired output torque,...
6462505 Method for monitoring a drive, and a drive  
In a drive, a position and/or a speed of the drive are detected by a drive sensor. After being digitized by a feedback unit arranged on or in the drive, the position and/or the speed of the drive...
6462504 Energization control device for electric motors  
An energization control device is provided to prevent rapid decrease of current which is flowing through each of phase coils of an electric motor. A time duration is divided into three stages...
6462496 Current mode approach to spindle motor current control and rotor position sense  
A control circuit for motor current including a circuit to generate a voltage to indicate the actual motor current, a first convert circuit to convert the voltage indicative of the motor current...
6459224 Zone control method in roller conveyor and zone controller  
In a roller conveyor system for carrying out zone control, a conveyed article can be stopped in an approximately constant position without varying the position where the article is stopped in a...
6456032 Method for controlling a motor roller  
A motor driver for drive-controlling a brushless motor being provided with a delay circuit that detects the motor pulse. When a stop signal is inputted, a transistor is activated, which in turn...
6424106 Motor  
FET power transistors of a power supplying part execute high-frequency switching operation and form current paths to three-phase windings. A voltage detecting part compares terminal voltages of...
6400116 Motor drive control apparatus  
A motor drive control system suitable for control of a drive of a motor, such as a brushless motor or a linear motor, having a plurality of excitation phases, through the use of rectangular waves....
6333610 Speed control device for an electronically commutated multiphase electric motor  
A speed control device, whereby individual motor phases of an electronically commutated multiphase electric motor are supplied via corresponding individual phase shifters from a constant voltage...
6326748 Brushless motor powered by DC power source  
A brushless motor composed of a cylindrical stator and a magnet rotor rotatably supported in the stator is driven by a battery. The stator includes a multi-phase armature winding to which current...
6222333 DC brushless motor controller apparatus and method  
A low cost, microprocessor (U1) based motor controller (10) for driving a half-wave, multiple speed, reversible, DC brushless motor (30) directly from standard AC 50/60 Hz power. A large number of...
6194852 High speed electric motors  
A high speed, brushless, DC motor has a rotor comprising a solid rare earth magnet core magnetized diametrically. The rotor includes a sleeve surrounding the magnet core to radially constrain the...
5990643 Sensorless commutation position detection for brushless D.C. motors  
A rotor position determination system for a polyphase D.C. brushless motor utilizing the back electromotive force (B.E.M.F.) voltage of the open or "off" phase of the motor as a critical signal...
5872435 Electrical drive arrangement  
An electrical drive arrangement for an electric motor including a stator having a plurality of phase windings, and a rotor. The drive arrangement includes an electronic commutation circuit to...
5872442 Brushless motor  
A brushless motor has a field part 20, three-phase coils 21, 22, and 23, a drive block 40 for supplying a power to the coils in accordance with output signals of a position detecting block 30, and...
5847524 Constant speed control for a motor  
A motor having a power switching circuit adapted to be connected between a power source and its winding for selectively energizing the winding to generate a magnetic field which causes a rotating...
5838123 Automatic phase adjuster for a brushless motor driving signal  
An automatic phase adjuster for the driver of a brushless motor is provided. This automatic phase adjuster can output a driving signal adaptively with a suitable phase-lead or phase-lag angle so...
5821710 Brushless motor having permanent magnets  
A brushless motor having permanent magnets that can be used as a prime mover for automobiles, in place of internal combustion engines, since the motor can yield high torque during low-speed...
5767654 Apparatus and method for detecting motor position in PWM operation of a polyphase DC motor  
A pulse width modulated (PWM) motor drive with back EMF monitoring of the floating phase of a polyphase motor is arranged so that zero crossings of the back EMF can be read without interference by...
5757152 Speed control method for brushless DC motor  
A speed control method for a brushless DC (BLDC) motor capable of solving the phases distortion problem generated between an applied voltage and a winding current of the motor during a high speed...
5677605 Brushless DC motor using phase timing advancement  
A drive system for a brushless DC motor uses pulse width modulation, and phase timing advancement to maintain a constant power output during high speed use. The arrangement is well suited for...
5609230 Vibration cancellation device  
The invention provides a vibration cancellation device for rigidly mounting to or forming part of an apparatus subject to vibration. The device comprises a mass supported by magnetic levitation...
5493187 Method and apparatus for controlling brushless motor  
The rotation speed of a brushless motor is detected to generate a signal synchronizing with the rotation of the motor, and, on the basis of the synchronizing signal, a plurality of duty signals...
5449986 Linearizing decoupling controller for electric motors  
An electric motor having optimum torque, comprising a motor having a shaft, a rotor and stator, permanent magnets generating flux and current in windings generating additional flux. A control...
5428276 Automatic adjustment of commutation delay for brushless DC motor for improved efficiency  
A circuit and method are provided for automatically adjusting a commutation delay from events indicating a position of a polyphase dc motor. The circuit includes a driver to supply drive current...
5334917 System and method for optimally driving a DC motor  
Method and a device in a drive system for a DC-motor including an inverter and a multiple phase synchronous motor with a permanent magnet rotor, and provided with a rotor position detection means...
5331239 Inverter integral type motor  
An inverter integral type motor which is fixed with radiator board formed with a plurality of radiating fins at bottom of the inverter, and both side walls of the radiator board are fixed to both...
5323094 Method of starting a sensorless multiphase dc motor  
In a sensorless multiphase dc motor which is started by repeating a sequence of steps in order to supply the stator with a series of discrete currents for rotating the rotor in a desired...
5319289 Adaptive commutation delay for multi-pole brushless DC motors  
A circuit to provide adaptive commutation delay for multi-pole brushless DC motors. The circuit adjusts the commutation delay as a function of the rotational speed of the motor to maximize motor...
5229693 Driving control apparatus for brushless motor with optimum controlled converter  
A position detector detects the position of a rotor of a brushless motor. A driving signal generator generates a driving signal at a timing corresponding to the detected position. While the...
5206567 Apparatus for reliably activating sensorless and brushless DC motor  
When a sensorless and brushless DC motor is started, the rotor having a magnet is positioned by first exciting one pair of motor coils and then exciting another pair motor coils. The excitation of...
5200675 Commutation circuit for a brushless D.C. Motor  
A commutation circuit for a brushless D.C. motor which circuit maximizes motor torque and motor efficiency for all ranges of motor load and speed, regardless of the connecting and conducting...
4949021 Variable speed constant frequency start system with selectable input power limiting  
The problem of providing an engine starting system from any one of a plurality of input power sources is solved with an engine start control apparatus operating a generator as a synchronous motor...
Matches 151 - 200 out of 216 < 1 2 3 4 5 >