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Document Title |
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7551411 |
Control and protection methodologies for a motor control module
A motor control module designed to control operation of a plurality of different motors in a plurality of different tools a power tool uses an electronic clutch in the module in conjunction with a...
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7545110 |
Motor drive control
A drive system for a multi-phase brushless motor comprises a single current sensor drive circuit, including switch means, switchable between a plurality of states. A controller is arranged to...
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7456597 |
Method of driving fan motor
A fan motor is driven under a pulse width modulation (PWM) control. PWM signals to be supplied to a circuit for driving the fan motor are formed from carrier waves having a specified frequency and...
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7359628 |
Control device for an electric motor
The invention relates to a drive device for an electric motor, in particular for a brushless DC motor in an electrical tool, which is powered by a rechargeable battery. The drive device has at...
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7308192 |
Motor drive control with a single current sensor using space vector technique
A drive system for a three phase brushless AC motor that is operative to optimize a transistor switching pattern to improve power output while allowing current measurement in all of the phases...
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7260319 |
Abnormality monitoring device for motor control system
An abnormality monitoring device monitors a PWM driving signal output from a driving section of an associated motor control system to judge whether the driving section is operating abnormally. By...
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7245106 |
Controller of pulse width modulation signal-driven device, and method of reducing noise of the device
A controller of a pulse width modulation signal-driven device, includes: an instruction input of operating the pulse width modulation signal-driven device; a control section generating a control...
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7231139 |
Digital noise reduction for motors
A system and method for reducing fan noise by controlling the drive current to the fan motor. In one embodiment the system approximates a linear drive using a number of transistors in parallel and...
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7193377 |
System and method for controlling motor speed using a biased pulse width modulated drive signal
A motor drive circuit includes a switching circuit having an input node that receives a drive signal and a control node that receives a control signal. The switching circuit couples the input node...
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7158865 |
Current driver employing pulse-width modulation
A current driver capable of generating a controlled current in the form of a pulse-width modulation (PWM) signal suitable for controlling an electronic device such as a solenoid is disclosed. The...
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7092623 |
Method and apparatus to achieve accurate fan tachometer with programmable look-up table
A system and method for measuring the speed of a fan is presented. The duty cycle of a pulse width modulated (PWM) power signal may control speed of the fan. The fan may generate tachometer pulses...
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6982531 |
Driving circuit for switches of direct current fan motor
A driving circuit for switches of direct current fan motor is disclosed. The driving circuit includes a plurality of switches, a first control circuit, and a second circuit. The switches are driven...
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6836614 |
Electrical power tool having a motor control circuit for providing control over the torque output of the power tool
A power tool such as an electric drill typically contains a gear train that couples the output spindle of the motor to the tool bit-receiving chuck. The control circuit for the power tool is...
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6810202 |
Apparatus for controlling rotational speed of motor
An apparatus for controlling a rotational speed of a motor, coupled to a sensing unit capable of outputting a sensing signal. The apparatus includes a controlling unit, coupled to the sensing unit,...
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6775469 |
Method of controlling an electronically commutatable motor
An electronically commutatable motor having field windings activatable in sequence with a commutation frequency via semiconductor output stages using control signals connectable and disconnectable...
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6700339 |
Circuit for regulating a power supply voltage
Disclosed is a circuit for regulating a power supply. In one embodiment, the circuit includes a signal generator for generating a square wave signal that varies in magnitude between a first voltage...
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6680596 |
Electric motor having regenerative braking
An electric motor having a regenerative braking capability is described which has several embodiments, each of which utilize two pairs of brushes, each pair of which has individual brushes...
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6671459 |
DC motor control method and apparatus
A method for maintaining a target speed of a DC motor includes the steps of obtaining a feedback signal from the motor corresponding to motor speed, measuring an actual time for a predetermined...
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6650074 |
Fan speed controller with conditioned tachometer signal
The speed of a fan motor is controlled by varying a DC voltage to the fan motor. A series pass transistor is used to vary the DC voltage to the fan motor. A power management controller sets the fan...
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6617818 |
Voltage independent PWM base frequency generating method
A DC brushless motor operation speed control method is disclosed. First, a linearly voltage dependent current source is used to charge a capacitor and the terminal voltage of the capacitor is...
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6580235 |
Electric motor with two modes of power supply switching
An electronically switched motor includes a stator-rotor assembly fitted with three-phase driving windings, a series of switches for powering the windings, and a control circuit suitable for...
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6534948 |
Motor driving circuit, a method for driving a motor, and a semiconductor integrated circuit device
A motor driving system is disclosed. The circuit includes a power converter for supplying a brushless motor having a permanent magnetic rotor with pulse-width modulation controlled driving power, a...
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6424113 |
Method and apparatus for pulse width modulation
A pulse width modulation circuit ( 10 ) for a motor controller is operated by generating an offset voltage and adding the offset voltage to a carrier timing signal to form an offset carrier timing...
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6385395 |
Fan motor with its speed controlled by operating periods of a pulse wave
A fan motor whose speed is controlled by an operating period of pulse waves includes first and second rectifying circuits, a voltage comparison circuit, and a differential amplifier. A pulse wave...
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6327424 |
Method of and circuit for operating a motor using power transistors
The pulse duration of voltage pulses for the control of a motor winding through power transistors is effected by writing data from a microprocessor or CPU to a module having intermediate register...
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6326760 |
Method and device for controlling a synchronous motor with permanent magnet
A method and device for controlling a synchronous permanent magnet motor with at least one phase, a coil and a rotor, wherein the method and device controls the powering of each motor phase,...
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6321032 |
Brushless repulsion motor
A brushless repulsion motor which includes a stator and rotor rotatably mounted on the stator is provided. The stator and rotor are contained within a first housing, the stator having at least one...
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6091887 |
Method and apparatus for controlling a physical parameter
The invention relates to a method for adjusting a real value (actual value) of a physical quantity to a preset value (target value) with the following steps: (a) the difference between the...
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6055359 |
DC motor drive control with improved current sensing
A PWM DC motor control circuit having improved current sensing. A power switching device controls the DC motor in a common drain connection, whereby armature current sensing is achieved at the...
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6002225 |
Method for the control of a motor
A method of breaking a motor includes the step of applying a pulse width modulated signal to the winding of the motor. A switching voltage is used to intermittently reverse the poles of the motor...
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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)...
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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...
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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...
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5802248 |
Multi-speed motor
Control circuitry for a multi-speed, rotational, direct current motor can include a means to select one of a plurality of discrete circuits to select a desired speed of the motor, each circuit...
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5798573 |
Split power supply
A power supply circuit for a control circuit of a motor having an armature, includes a first power supply branch having a series combination of a first resistor, a first diode and a Zener diode...
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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...
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5721474 |
Method and apparatus for preventing excessive current flow in a motor
A motor control circuit comprises a current command circuit generates a current command signal proportional to a selected motor speed. A comparator generates a comparator output signal proportional...
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5574344 |
Power steering apparatus for performing feedback control of motor-driving current
A power steering apparatus for use in association with an electric motor, includes a switch circuit driven by a PWM wave signal which switches between one polarity and the other of the voltage...
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5309077 |
Apparatus and method for loading a cassette tape in a video equipment
An apparatus and a method for loading a cassette tape in a video equipment, in which driving of a DC motor can be controlled according to an amount of load which is applied to the DC motor when the...
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5296787 |
Method for regulating a motor current of a brushless D.C. motor
A method for regulating a motor current in phase windings of a brushless d.c. motor, wherein current is applied to the phase windings individually via an electronically controllable, d.c.-voltage...
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5291109 |
Windshield wiper system
A windshield wiper system (10) which includes an electrical drive motor (12) that makes available a driving moment for at least one windshield wiper (16) performing a back and forth movement on a...
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5260634 |
Constant current driving system for a stepper motor in rotating disk
In order to drive the stepper motor of a floppy disk drive with practically constant current in the face of fluctuations in supply voltage fed from a host system, a power control pulse generator...
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5220634 |
Control circuit for a DC motor
A DC power supply for a DC motor is controlled by a drive transistor. An "ON" state of the drive transistor is maintained by a comparator which compares a terminal voltage at a point between the DC...
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5126642 |
Variable speed motor control
A motor control for a multi-phase compressor motor. The control responds to a speed control signal to cause the motor speed to track the speed control signal without changing the motor torque. This...
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5077824 |
Direct-current motor control
A motor control circuit for controlling supply of electric power from a power source to an electric motor, in particular for use in electric power tools, comprising: an output power device for...
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5077823 |
Electric motor starting circuit
The invention provides a cushioning control circuit which restricts the initial flow of current to a D.C. permanent magnet motor by providing a neon control lamp in series with a pair of triac...
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5017854 |
Variable duty cycle pulse width modulated motor control system
A control system for controlling a direct current powered motor in which the direct current voltage, which may not be constant, is reversibly commutated across the coil or winding of the motor...
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4980620 |
Current-free synthesis of parameter-free zero-impedance converter
A method of synthesizing a system which forces finite value of an impedance to zero comprising a positive voltage feedback of a prescribed amount of voltage feed back and a negative voltage...
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4963810 |
Variable load motor drive control
The invention relates to a method and apparatus for making low inertia motors useful under circumstances where the load exerting drag on the motor during start-up acceleration may be different from...
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4905300 |
Motor control and power systems and methods of operation thereof
A pulsating D.C. voltage is developed by a rectifier 86 and is filtered by a capacitor 100 to facilitate application of a relatively smooth, enhanced D.C. voltage to a motor 106. The charged...
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