|
Match
|
Document |
Document Title |
|
|
7623770 |
Fan control system
A fan control system includes a power source, a switch control circuit, a switch control signal delivering unit and a fan circuit module. The power source outputs a nominal power, the switch...
|
|
|
7599612 |
Method of calibrating a motorized roller shade
Calibration of a motorized roller shade is accomplished by calculating a radius of a roller tube and thickness of a shade fabric rotatably supported by the roller tube. First, a lower edge of the...
|
|
|
7590334 |
Motor controller
In one aspect, a control circuit to control a speed of a motor includes a PWM oscillator configured to generate a PWM output signal having a duty cycle. The speed of the motor is controlled by the...
|
|
|
7580617 |
Electric fan device and method of driving electric fan device
An electric fan device includes a motor which drives an electric fan for a vehicle, a control switch which controls a motor current supplied to the motor, and a control unit which controls an...
|
|
|
7545112 |
Fan motor control method and device thereof
A fan motor control device comprises a clock signal generator and a drive unit. The clock signal generator generates a low-frequency clock signal. A frequency of low-frequency clock signal is less...
|
|
|
7518330 |
Protect-control device capable of limiting current for reducing noise resultling from switchover of motor
A protect-control device capable of limiting current for reducing noise resulting from switchover of a motor includes a motor coil set, a driving unit, a sensing unit and a control unit. The motor...
|
|
|
7509032 |
Motor drive control circuit and motor apparatus using the same
A motor drive control circuit includes a rotation control amplifier that compares the lower of a voltage limiting reference voltage of a reference voltage source and a rotation speed control...
|
|
|
7492112 |
Apparatuses and methods for controlling rotational direction of fan
An apparatus is used for controlling a rotating direction of a fan. The apparatus comprises a power source, a signaling unit, a switching unit, and an activating module. The power source is used...
|
|
|
7489855 |
Systems and methods for driving a load
One embodiment of the invention relates to a control system. A control system includes a controller configured to generate a drive signal as a function of a comparison between a first control...
|
|
|
7459824 |
High torque repulsion motor
A high torque AC motor of the repulsion type that includes at least four stator poles and an armature with chordally oriented windings. The armature windings are cyclically shorted and opened in...
|
|
|
7444070 |
Fan motor with digital controller for applying substantially constant driving current
An improved fan arrangement features a radial or diagonal fan ( 370 ) with which a direct current motor ( 32 ) is associated as its drive motor, further comprising a digital control element ( 23,...
|
|
|
7443119 |
Circuit and method for controlling the rotating speed of a BLDC motor
A circuit and a method for controlling the rotating speed of a brushless direct current (BLDC) motor are provided, whose goal is solving the stall problem encountered by conventional BLDC motors...
|
|
|
7421193 |
Digital motor control system and method
A digital motor control system utilizes time duration electric pulses generated by digital logic to control the motor speed and direction of rotation of a D.C. or A.C. motor. The digital logic...
|
|
|
7411368 |
Electric motor speed controller for vehicle
An electric motor speed controller for use in a bicycle includes a motor to provide a propulsion force to move the bicycle. The actual motor speed and a target motor speed are compared, and if the...
|
|
|
7403700 |
Motor control device
A motor control device is used to control a motor to rotate. The motor control device includes a phase-wave signal sampling module, a first waveform modulating module, a second waveform modulating...
|
|
|
7382105 |
Motor driving device and electric power steering apparatus
In a motor driving device where a motor having a winding wire with small inductance value is driven by a digital control means comprised of control means including a current command value...
|
|
|
7375486 |
Method and circuit for controlling motor speed
A method of controlling a rotational speed of a fan motor for a heat generating electronic component includes the following steps: (1) obtaining an original PWM pulse in response to an internal die...
|
|
|
7355359 |
Universal apparatus for driving diverse fans
A universal driving apparatus of a computer system, including a receptacle, a power switch, an integrator and a comparator, is provided to identify and drive a first fan and a second fan. The...
|
|
|
7327114 |
Fan control utilizing bi-directional communications
A system and method for bi-directional communication between a system controller and a fan controller: The system operates in two modes and there are two communication paths between the system...
|
|
|
7323838 |
Motor control method and device thereof
A motor control method and device. The motor control device includes a programmable integrated circuit (IC) receiving a phase signal, the phase of which is consistent with the rotation phase of a...
|
|
|
7319652 |
Controlling optical pickup of optical disk drive by detecting change of sampling signals taken from a motor drive signal
A drive current or a drive voltage is controlled corresponding to change of load by sampling the drive current or drive voltage of a motor to move an optical pickup and then detecting change of the...
|
|
|
7298967 |
Electromagnetic sensor direct communication algorithm to a digital microprocessor
A method of interfacing an electromagnetic sensor with a controller in a motor control system, the method including: applying an excitation signal to the electromagnetic sensor; receiving a first...
|
|
|
7288905 |
Integrated circuit and method for trainable control and operation of DC motor
A method and device for control of a low-cost DC motor such as that suitable for portable or battery-powered applications are disclosed such that an intended behavior for the motor may be...
|
|
|
7276875 |
Multimode integrated modulation circuit for controlling fan rotating speed
A multimode integrated modulation circuit for controlling the fan rotating speed mainly includes a voltage regulating circuit, an integrated modulation circuit and a fan motor driving circuit. The...
|
|
|
7276867 |
Controller arrangement with adaptive non-overlapping commutation
A PWM controller for a direct current brushless motor comprising first and second windings includes a motor drive circuit receiving pulse width modulation control signals to drive the first and the...
|
|
|
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...
|
|
|
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...
|
|
|
7245100 |
Multi-axis AC servo control system and method
A multiple axis servo control implements a multi-tasking PWM control unit to provide PWM signals for multiple axes in a single unit. A time slice mechanism provides axis selection signals based on...
|
|
|
7245099 |
Electronic apparatus that allows cooling fan to be driven with certainty even at the time of software malfunction/lock-up or at the time of controller failure
A voltage for driving a cooling fan is usually output from a fan voltage control circuit. Whether to cause the fan voltage control circuit to output the drive voltage or not is controlled by a...
|
|
|
7235940 |
Torque limiting device for an electric motor
A rotary speed limiting device for an electric motor has a current detecting device for detecting a motor current of the electric motor, a nominal value setting for adjusting a torque, a control...
|
|
|
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...
|
|
|
7218073 |
Fan motor speed control circuit
A fan motor speed control circuit is disclosed. The circuit includes a digital/analog converting unit and a driving unit. The digital/analog converting unit takes charge of receiving a pulse width...
|
|
|
7205733 |
Self-startup circuit for DC fan
A self-startup circuit for a DC fan includes a voltage sampling device receiving a first control signal, a comparator, and a self-startup device. The comparator includes two input terminals and an...
|
|
|
7184654 |
Semiconductor device control apparatus and method
In a control apparatus for a motor, which rotates a fan, a semiconductor device is connected to the motor in series to drive the motor. An analog driver circuit drives the semiconductor device with...
|
|
|
7174093 |
Wheel chair drive apparatus and method
A control system for a powered wheel chair drive modulates a pulse power delivery signal such that power is delivered gradually at throttle positions corresponding to a low speed, and power is...
|
|
|
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...
|
|
|
7141950 |
Fan control utilizing bi-directional communication
A system and method for bi-directional communication between a system controller and a fan controller: The system operates in two modes and there are two communication paths between the system...
|
|
|
7133601 |
Amperage control for protection of battery over current in power tools
Amperage control of a power tool motor is provided by pulse width modulation of current from a power supply. The pulse width modulation may be varied according to the determined motor current and...
|
|
|
7123458 |
Method and circuit arrangement for protecting an electric motor from an overload
A method and a circuit for protecting an electric motor and/or its trigger circuit against overload in the emergency-operation mode in a motor vehicle direct-current fan motor operated by means of...
|
|
|
7116622 |
Optical storage device rotation speed control apparatus and method
A method for controlling the rotation speed of an optical storage device. In the first mode, a first signal is produced, and in the second mode, a second signal is produced. In one mode, a first...
|
|
|
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...
|
|
|
7076159 |
Method and apparatus for generating accurate fan tachometer readings
A system and method for measuring the speed of a fan in an electrical system is presented. The duty cycle of a pulse width modulated (PWM) signal provided by a signal generator may control the...
|
|
|
7075261 |
Method and apparatus for controlling a fan
A method and apparatus for controlling a fan is disclosed. In one embodiment, a method for controlling a fan includes applying power to the fan at startup. The fan may be supplied a predetermined...
|
|
|
7026775 |
Method and apparatus for controlling speed of moving body
Method and apparatus for controlling a moving speed of a moving body, wherein at least one transient target speed value in addition to a final target speed value is used to control the moving speed...
|
|
|
7006762 |
Pulse width modulator
The present invention encompasses a high efficiency pulse width modulator comprising: a variable duty cycle oscillator for receiving an input signal and providing a low level switching signal; a...
|
|
|
7006761 |
Control device for DC motors
In order to design as inexpensively as possible a control device for DC motors which are provided with a commutator for feeding their motor windings which has at least four sliding contacts, this...
|
|
|
6995534 |
Method of controlling the commutation in an electronically commutated motor, and an electronically commutated motor for carrying out said method
A method is disclosed for controlling the commutation in an electronically commutated motor ( 20 ) which comprises a stator having at least one phase ( 24, 26 ), and a permanent-magnet rotor ( 22...
|
|
|
6972534 |
Delay compensation for stable current regulation when using variable-delay random PWM switching
A control system for an electric machine having a rotor position sensor that generates a rotor position signal, a velocity module that generates an electric angular velocity value based on the...
|
|
|
6891346 |
Commutation and velocity control system for a brushless DC motor
A commutation and velocity control system of a brushless DC motor receives a velocity command signal and provides command signals to drive the brushless DC motor. The system includes a summer that...
|
|
|
6879120 |
Speed control circuit of brushless DC fan motor
There is provided a brushless DC fan motor which can eliminate an oscillator for PWM, control the motor speed at a low cost with high accuracy, and efficiently adjust the temperature in a housing...
|