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8981701 Apparatus and method for compensating offset of current sensor  
Provided is an apparatus for compensating offset of a current sensor detecting a motor current supplied by an inverter for PWM (Pulse Width Modulation) control of a motor, the apparatus including...
8957617 Controller and method for improving motor driving efficiency  
The present invention discloses a controller and a method for improving motor driving efficiency. According to the present invention, multiple control parameters are inputted to the controller so...
8947035 Heat dissipation system, rotation speed control circuit and method thereof  
A rotation speed control circuit is disclosed. The rotation speed control circuit includes a temperature-controlled voltage duty generator, a pulse-width signal duty generator, a multiplier and a...
8933653 Motor current detection apparatus, motor controller, and electric power tool  
A motor current detection apparatus in the present invention includes: a current detection unit, a first filter, and a second filter. The detection unit detects a conduction current flowing from a...
8796977 Voltage regulator for DC motors  
A voltage regulator for a pair of electric motors has an input for a signal indicative of the desired speed for the motors and a pulse width modulation control circuit device. A control module...
8796978 Predictive pulse width modulation for an open delta H-bridge driven high efficiency ironless permanent magnet machine  
Embodiments of the present method and system permit an effective method for determining the optimum selection of pulse width modulation polarity and type including determining machine parameters,...
8680807 Motor control apparatus and image forming apparatus  
A motor control apparatus for controlling a DC motor includes a first detection unit configured to detect an angular velocity of the DC motor, a driven member configured to be driven by the DC...
8674640 Electric power tool  
An electric power tool includes: a motor; a manipulation input receiving unit which receives a user manipulation input for rotating the motor; a mode changeover unit that has one manipulation...
8653775 Method and device for controlling an electric motor  
A method and a device for controlling and/or regulating an electric motor. Such electric motors are used for example in motor vehicles in the form of pump motors. In general, the electric motor is...
8648552 Control system for an electric machine  
A control system for an electric machine, the control system including a position sensor and a drive controller. The drive controller generates one or more control signals for exciting a winding...
8633667 Semiconductor integrated circuit device  
A motor speed determining circuit determining a rotation speed of a motor is provided and a processing of generating motor driving waveform is switched in accordance with the rotation speed of the...
8633780 PWM control circuit and motor equipped with the same  
The PWM control circuit is provided. The PWM control circuit includes: a PWM control signal generator that generates a PWM period signal defining a period of a PWM signal and a PWM resolution...
8624538 Motor driving apparatus having function of dynamically switching converter operation mode of AC/DC converter  
A motor driving apparatus is provided that performs AC/DC conversion by suppressing harmonics of the input at the time of normal operation, while on the other hand, allowing system operation to...
8618754 Motor control apparatus and image forming apparatus  
A motor control apparatus that controls a DC motor includes a detection unit configured to detect angular speed of the DC motor, a driven member configured to be driven by the DC motor, and a...
8602746 Electrical system for a pump  
In at least some embodiments, an electrical system for a pump includes a power supply and a controller coupled to the power supply, the controller supporting a plurality of pump cycle levels. If a...
8552669 Duty ratio control device, electric power tool and recording medium  
A duty ratio control device includes a duty ratio calculation unit and a parameter setting unit. The duty ratio calculation unit, when an acceleration manipulation is performed, calculates a...
8541971 Driving system of permanent magnet synchronous motor  
When applying a high frequency voltage which alternates on positive and negative sides to a permanent magnet synchronous motor, a driving system of synchronous motor switches the applied voltage...
8519649 Control device of a synchronous motor  
A control device of a synchronous machine is disclosed. The control device includes an inverter configured to provide an output current to a synchronous machine. A controller configured to control...
8494349 Measuring pressure  
A method and apparatus are disclosed for determining a negative pressure generated by a suction pump of a topical negative pressure (TNP) system. The method includes the steps of disconnecting a...
8425201 Fan system and motor control circuit  
A control circuit is electrically connected to at least one fan device. The fan device has a motor and generates a sensing signal. The control circuit receives a power-source signal and the...
8378614 Fan control circuit  
A fan control circuit includes a first switch element, a second switch element, and a fan connector. A first control terminal of the first switch element is connected to a fan control terminal to...
8350512 Electric power tool  
An electric power tool is provided that includes a motor as a driving source, a first operation switch, a first semiconductor switch, and a second semiconductor switch. The first operation switch...
8344684 Driving circuit for motor and device equipped with driving circuit  
The circuit structured to drive a motor is provided. The circuit includes: a division signal generator that generates a division signal dividing each of a high level period and a low level period...
8331774 Fan controlling circuit  
A fan controlling circuit is provided. The fan controlling circuit includes an integral unit, an operational amplifier, a PMOS transistor, and an NMOS transistor. The integral unit transforms...
8280559 Apparatus and method for providing cooling to multiple components  
In an embodiment, an integrated circuit includes an input configured to receive a first control signal and an output module configured to generate an output signal based at least on the first...
8248016 Fan circuit  
A fan circuit controls a speed of a fan. A control chip outputs a pulse width modulation (PWM) signal that changes with the temperature of an electronic device that the fan is mounted in. An input...
8242727 System and method for a high efficiency remote three phase fan commutation integration control in an information handling system  
An information handling system includes a three phase brushless direct current motor and a motherboard which in turn includes a drive circuit. The three phase brushless direct current motor is...
8237395 Dual-speed single-phase AC motor  
A dual-speed single-phase AC motor, including: a stator, including a stator core, and a coil winding, including a starting winding, a first main winding, and a second main winding, a rotor, and a...
8238729 Fan controlling circuit  
A fan controlling circuit is provided. The fan controlling circuit includes an integral unit, an operational amplifier, and an output unit. The integral unit transforms pulse width modulation...
8232755 Motor with circuits for protecting motor from input power outages or surges  
A DC motor is provided. The DC motor prevents rush or overload of current in the DC motor during and/or after power input irregularities to the DC motor. A control circuit of the DC motor is...
8217614 Fan delay controlling apparatus  
A fan delay controlling apparatus includes a connector connected to a fan of an electronic device, a power supplying module connected to the connector, and a power controlling module connected to...
8198838 Circuit for controlling rotation speed of computer fan  
A circuit for controlling a rotation speed of a computer fan includes a control chip, a conversion circuit, a fan header, a first switch, and a second switch. When a first terminal of the first...
8190005 Motor driving circuit and load driving apparatus with pulse width modulation  
When the bit number of an error signal ERR2 is n and the magnitude of the error signal ERR2 is “a” (a is an integer) in decimal notation, a pulse-width modulator generates a PWM signal Spwm as a...
8159172 Method for controlling an electric motor by using the PWM technique  
A method for controlling an electric motor by using the PWM technique including the steps of: applying to the clamps of the electric motor an electric voltage varying in time, which displays a...
8098036 Electric power tool  
An electric power tool is provided that includes a motor as a driving source, a first operation switch, a first semiconductor switch, and a second semiconductor switch. The first operation switch...
8093854 Fan speed control system  
A system for controlling the fan speed is described. Specifically, one embodiment of the present invention set forth a computing system, which includes a first processing unit including a first...
8072167 Time delay logic of motor control  
Circuitry for controlling a motor, such as a brushless motor (BLM), is disclosed. The circuitry may comprise one or more inputs for receiving rotor position signals from one or more Hall effect...
8055124 System for controlling rotary speed of computer fan  
A system can control a rotary speed of a computer fan according to the type of the computer fan. If the computer fan is determined to be a 3-pin fan, the system can output a changeable voltage to...
8050543 Trigger mechanism for current acquisition used for motor control applications  
A trigger mechanism for starting current acquisition for motor control applications is disclosed. The present invention may generate an edge (ADC trigger) that can be used to start current...
8036518 Motor and motor speed controlling system  
A motor and a motor speed control system are disclosed. Two power signal lines and one feedback/speed-control signal line are coupled between a control device and the motor. The two power signal...
7983539 Control circuit for fan  
When the fan inserted in the fan header is a 4-pin fan, the control chip outputs PWM signals with different duty factors to the control pin of the fan header, to automatically change the rotary...
7949233 Method and device for controlling a heat-dissipating fan for an electronic component  
A method for controlling a heat-dissipating fan for an electronic component includes the steps of: detecting a temperature of the electronic component, and outputting a first control signal...
7949235 Electronic module and arrangement for signal transmission with the former  
The invention concerns an electronic module for a motor vehicle, in particular a fan regulator (4″) with a control input (S) for a signal, in particular a pulse width modulated signal, transmitted...
7928674 Motor speed control systems  
A motor speed control system includes a pulse outputting device capable of outputting a pulse each time a motor rotates, a pulse interval determining device capable of determining a pulse interval...
7917017 Motor drive apparatus and method  
If a PWM duty instruction D1 determined by a duty calculation circuit exceeds an upper limit value, a duty signal processing circuit in a motor drive apparatus divides a switching current supply...
7906929 Method and device for controlling a three-phase machine having several phase windings, which can be controlled by means of pulse width modulation  
An aspect of the invention is a method and a device for controlling a rotating field machine having several phase windings, which can be controlled by means of pulse width modulation, wherein a...
7903955 Motor driving device  
A driving device is provided for controlling rotation of a motor. The driving device comprises an inputting module, a comparing module and a processing module. The inputting module includes a...
7898211 Driving circuit for motor and device equipped with driving circuit  
The circuit structured to drive a motor is provided. The circuit includes: a division signal generator that generates a division signal dividing each of a high level period and a low level period...
7889977 Single output H-bridge drive  
Disclosed is a drive circuit for generating the drive current used to energize the windings of a motor. The drive circuit includes a data processing unit that produces two outputs used to control...
7880427 Method for operation of a two-stranded electronically commutated motor, and motor for carrying out said method  
A two-stranded electronically commutated DC motor has a permanent-magnet rotor (36), power supply terminals (28, 30) for connecting the motor to a current source (22) and a stator (102) having a...