Matches 101 - 150 out of 385 < 1 2 3 4 5 6 7 8 >
Match Document Document Title
5986426 Adaptive pulse width modulated motor control  
A motor control method and apparatus for spindle motor control and for voice coil motor (VCM) control in a direct access storage device (DASD). Characteristics of the pulse width modulation (PWM)...
5978547 High-turndown DC motor controller and method  
A hybrid DC motor controller is provided for driving a DC motor. A switch is connected in series with the DC motor, and a capacitor is coupled in parallel with the DC motor and the switch. The...
5963707 Method and apparatus for determining and adjusting torque in an electric impact torque wrench  
A method and apparatus for adjusting torque in an electric impact torque wrench. A current sensing circuit passes current through a power relay for powering an electric impact torque wrench. The...
5953490 Circuit for speed control for a one-phase or three-phase motor  
The circuit for speed regulation of a three-phase motor incorporates a drive connected directly to a three-phase mains (R,S,T) which allows through mains voltage directly to the motor windings...
5953491 Control system for a permanent magnet motor  
The speed of a rotor in a two-winding, permanent magnet motor can be accurately controlled with a dual-polarity pulse width modulation drive signal. The phase back emf signal generated in the...
5949202 Distributed power supply for high frequency PWM motor controller with IGBT switching transistors  
A distributed power supply for a motor controller including electronic control circuits for controlling IGBT power transistor stages. The power supplies for the power transistors and gate drivers...
5940576 Electronic control unit for a vacuum pump  
The invention is concerned with an electronic control unit (1) for the electric motor of a vacuum pump (100) comprising a suction port (119), an exhaust port (120) and pumping stages formed by...
5932979 PWM speed-control apparatus for elevators  
A PWM speed regulating apparatus for DC elevator comprises a rectifier-filter (1), voltage suppressor (2), chopper voltage regulator (3), system controller (4) and a driving protector (5). The...
5933573 Method of controlling an electric motor and apparatus for carrying out the method  
An electric motor (12) is supplied with current (i mot ) via a semiconductor switch (14). During operation, the semiconductor switch (14) is driven by a Pulse Width Modulation (PWM) unit 15 using a...
5923145 Controller for variable speed motor  
A controller controls the running speed of a variable speed motor of the type which runs at a speed related to the duty cycle of a pulse width modulated drive voltage applied to it and to the load...
5915070 Motor driving apparatus for pulse-width modulation controlling a DC voltage according to a rotation speed setting information  
A motor driving apparatus PWM-controls a DC voltage from a rectifying unit according to a rotation speed setting information, and drives a motor by voltage pulse chooped by PWM. The rectifying unit...
5901268 Drive control apparatus for brushless motor  
In order to prevent the performance of a motor from deteriorating due to a change in which the rotation rate of its rotor is to be increased suddenly, in a brushless motor in which a drive pulse...
5896487 Opto-electrically controlled direct current motor speed control circuit  
A dc motor speed control circuit is provided. A first circuit utilizing an opto-electric sensor for providing an input signal corresponding to a desired dc motor speed is connected to a second...
5894209 Apparatus for and method of controlling stepping motor  
An apparatus for controlling a stepping motor used for moving a carriage having a pickup from a first position to a second position, the apparatus having: a calculating device for calculating a...
5892347 Tape drive with high performance gain amplifier using radio frequency dielectric heating  
A power amplifier (18) for driving a brushless DC motor (22) includes a processor (40) which receives a signal indicative of motor situational usage and generates a mode state signal indicative of...
5889922 Drive arrangement for an electric motor  
The invention relates to a method for driving an electric motor (1) which is employed, in particular, in manually guided electric tools, such as drilling machines, screwing machines or the like....
5886484 Masking of switching noise in controlling a "H" bridge  
Masking of switching noise is implemented in the driving system of an "H" bridge stage by exploiting the periodic signal generated by a PWM control circuit (normally present in the control system...
5869944 Motor driving apparatus  
A motor driving apparatus enabling direct pulse width modulation driving (direct PWM driving) in a sensor-less motor. The motor driving apparatus includes a comparison unit for comparing...
5859511 Motor with input-controlled high side driver  
A circuit for operating a polyphase DC motor, such as the type having a plurality of "Y" connected stator coils, has circuitry for charging the coils at a rate which will reduce EMI and other...
5857496 Weaving apparatus including switched reluctance drive  
Weaving apparatus comprises a warp beam bearing warp threads, a loom on which the warp threads are woven with weft threads, and a take-up roller for taking up the woven material. The loom is...
5835676 Motor driving apparatus  
An apparatus for driving an electric motor, including a full-wave rectifier which rectifies an alternating current supplied from an alternating-current power supply, and supplies a full-wave...
5825972 Direct current fan motor speed controller  
A minimum fan RPM control circuit constantly turns a computer exhaust fan at a minimum RPM while the computer is on. The RPM control circuit includes a blanking and reset circuit responsive to a...
5821708 Electronically commutated motor control  
A method and apparatus for controlling the speed of a multi-phase, brushless DC electrically commutated motor (ECM). Voltage is commutated to the windings of the ECM based on rotor position...
5811946 System and method for velocity control of a D.C. Motor  
A system and method is disclosed for feedback velocity control of a D.C. motor. The system includes a motor (30) which is represented by its circuit equivalent--a series combination of an...
5796230 Method for triggering a final control element  
A method for triggering or controlling a final control element uses a pulse width modulated signal. A sequence of the pulse width modulated signal is fixed by a predetermined time raster. After a...
5793183 Motor system with interrupted PWM oscillation  
A brushless DC motor system using PWM switching, in which the PWM switching is temporarily frozen whenever a zero crossing is expected in the back EMF. This avoids disruption of zero-crossing...
5787376 Power steering motor control unit with driving mode correction  
A power steering motor control unit for driving a motor in a PWM mode with feedback motor current control reduces fluctuations in the output torque of the motor caused by switching among a...
5780986 Soft switching, PWM controller and method for reducing torque ripple in multiphase DC motor  
A PWM controlled multiphase DC motor apparatus has a multiphase DC motor, a current sensor, and a PWM controller. The DC motor has multiple windings which turn on and off during commutation at a...
5774626 Programmable dual-phase digital motor control with sliding proportionality  
A digital motor control is described which is programmable and has dual digital phase with sliding proportionality such that the motor control adaptively alters a speed of a motor by both changing...
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...
5760563 Method and apparatus for providing thermal feedback between an analog power chip and a digital controller chip in a disk controller system  
A disk drive has a microprocessor, a digital controller chip, and an analog power chip, and a multi-winding spindle motor. The power chip operates under gross and fine control to connect and...
5742142 Low radiated emission motor speed control with PWM regulator  
An FET switch and an inductor in series with a DC motor supply voltage pulses at a high frequency, a power diode permits current recirculation, and a capacitor connected to the motor maintains a...
5740040 Electric power steering apparatus with enhanced road feel  
An electrically-operated steering apparatus in which in addition to avoiding an increase in cost caused by installing a new sensor or using a high process speed CPU, steering feels, such as...
5739658 Noise dithering system for transistor switched devices  
A noise dithering system provides gating signals to switching transistors that selectively apply power to an output device in response to the gating signals, wherein said gating signals include a...
5731672 Control apparatus of DC servo motor  
When a processor sets a current instruction value and a rotating direction of a motor, two analog instruction signals of a positive polarity and a negative polarity are obtained after completion of...
5729110 Method for controlling an electronic X-Y shifting mechanism for a vehicle transmission  
A control strategy for an electronically controlled X-Y shifting mechanism for a vehicle transmission which takes advantage of the extra supply voltage available on European vehicles while...
5729652 System for controlling the speed of a motor driven by an unregulated voltage  
A method for controlling the speed of a motor driven by an unregulated voltage supply is disclosed. The disclosed method comprises obtaining a ripple signal (V R ) representative of the ripple...
5696642 Circuit for controlling the rotation of a rotating member  
A circuit for controlling a rotating member is provided with an input capture register which reads out the value of a free running counter at a timing of an FG (frequency generated) pulse generated...
5682459 Speed control for controlling the speed of a DC motor  
A speed control for controlling the speed of a DC motor provides improved speed regulation during transient loading conditions. The control includes a regulating circuit having an output for...
5675699 Motor controller  
A motor controller is provided which improves response to control inversion of a motor, and which also improves controllability and driving comfort when applied to electric power steering. In the...
5647051 Cold therapy system with intermittent fluid pumping for temperature control  
A cold therapy system for applying a cooling pad to an area of the body of the user. The system comprises a portable insulated cooler having a lid and serving as a reservoir for water and ice. A...
5632000 Device for optimizing the speed control behavior of a subfractional horsepower motor  
A device for the optimizing of the speed control of an electric subfractional horsepower motor for dental instruments is provided wherein it is possible to operate the motor in any desired speed...
5627758 Vector control board for an electric vehicle propulsion system motor controller  
A vector control board for an electric vehicle propulsion system motor controller comprising a microcontroller for generating torque requests, a digital signal processor for receiving the torque...
5625542 Low-noise operation of a machine fed by a pulse inverter  
A method and apparatus for the low noise operation of a electrical machine driven by a pulse inverter computes the amplitudes and frequencies of the harmonics of the inverter output voltages....
5623192 Apparatus for carrying out current control for variable speed driver and method for carrying out current control therefor  
An apparatus for carrying out a current control and method therefor are disclosed in which the current control is such that no 0 vector defect is present by switching from a three-arm modulation...
5577154 Radio controlled model control system with nonlinear trigger-to-controller-output response  
A control system for a radio controlled model includes an onboard speed controller, an onboard receiver, and a separate transmitter unit having a throttle/brake trigger or other manually moveable...
5577153 High frequency control circuit for DC motors, particularly for washing machines  
A control circuit for a series type dc motor. The control circuit uses a switching cell to control motor speed. The switching cell and motor receive power from a filtered dc supply. A tachometer...
5577152 Motor assembly  
A motor assembly includes a brushless dc motor and a driving unit. The driving unit includes three first power transistors, each being activable to connect a respective one of three windings of a...
5563980 Brushless DC motor speed controller  
Provided is a brushless DC motor speed controller in which the speed feedback signal needed for speed control is obtained from the commutation signals generated by the magnetic-pole sensor in the...
5563479 Power supply apparatus for electric vehicle  
A power supply apparatus for an electric vehicle, which is adapted to restrain battery discharge due to current pulsations of a load. The apparatus has a battery, a coil and a capacitor connected...
Matches 101 - 150 out of 385 < 1 2 3 4 5 6 7 8 >