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7622880 |
Voice-coil motor control with zero-current sensing
A circuit for controlling a voice-coil motor (VCM) may incorporate a pulse-width modulation driver to drive the VCM, a zero-current detector to determine whether the current across the VCM is zero,...
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7616466 |
Three phase inverter with improved loss distribution
An inverter circuit couples a DC voltage source having a primary side and a reference side to an electric motor or other AC machine having multiple electrical phases. An inverter circuit includes...
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7615958 |
Motor control device
The present invention is a motor control device comprising a control system, the control system being capable of controlling the motor by PWM and having integration means being capable of...
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7612518 |
Inverter apparatus and method of reducing speed of alternating current motor
There is provided an inverter capable of reducing a speed in a short period of time without generating an overcurrent even in a case of an alternating current motor which is easy to be saturated...
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7612517 |
Stepping motor controller and gaming machine
A stepping motor controller includes: a pulse frequency adjustment circuit that receives a command pulse having a first frequency from an external controller that outputs the command pulse in...
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7612508 |
System and method for communication with an information handling system cooling fan
An escape sequence coded in power commands from a system controller, such as a BMC, to a cooling fan controller directs the cooling fan to send identification information coded in tachometer...
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7612507 |
Motor controller
A motor controller capable of appropriately change the drive control condition in response to variations generated in motor drive control. The receiving circuit wirelessly receives and demodulates...
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7609024 |
Auxiliary bus method
Certain exemplary embodiments can comprise a system comprising an electric drive system for a machine. The system can comprise a rectifier adapted to convert AC power from an alternator to DC...
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7609021 |
Method and arrangement for monitoring signals
The invention relates to a method and to an arrangement for monitoring signals which are guided to a multi-phase motor by an end stage and the pulse width thereof is controlled by a controller. The...
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7605556 |
Microcontroller methods of improving reliability in DC brushless motors and cooling fans
A method of controlling a motor speed for a fan assembly includes receiving a duty cycle value at a microcontroller. The microcontroller receives a measured fan speed from a speed sensor. An...
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7598698 |
Motor control device
A motor control device includes a current detecting portion that detects phase current of one phase among three phase currents supplied from an inverter to a motor, and a current estimator that...
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7598687 |
Method and control unit for controlling fan motors
A method for controlling a first fan motor using a first pulse width modulation signal having a first pulse control factor, and for controlling a second fan motor using a second pulse width...
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7595605 |
Method and control circuit for determining an operating state when controlling a fan motor
A method is described for determining an operating state on triggering a fan motor, the fan motor being operated with the aid of a switching device, the switching device being activated via a...
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7595599 |
Drive regenerative control system
Provided is a drive regenerative control system of a drivee with a motor superior in torque and weight balance and suitable for miniaturization as the drive source. In a drive regenerative control...
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7589490 |
Motor control system for the PWM control of an electric motor
The subject of the present invention is a motor control system having a monitoring circuit for monitoring PWM control for a DC electric motor, the PWM control comprising a power end stage having at...
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7586287 |
Computer housing temperature control device
A computer housing temperature control device is disclosed. The present invention obtains the PWM signal generated from the CPU in the motherboard to control the rotation speed of all cooling fans...
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7586277 |
Electric power steering device
An electric power steering device changes the discontinuous non-linear characteristics in the duty ratio of the PWM signal versus motor current generated during steering wheel handle return into...
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7583047 |
Quenching device for a converter bridge with line regeneration
There is described a method for controlling a quenching device for a converter bridge with line regeneration, whereby the converter bridge controlled by a network-timed control circuit by ignition...
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7573217 |
Methods and systems for automatic rotation direction determination of electronically commutated motor
A method for determining a direction of rotation for an electronically commutated motor (ECM) is described. The motor is configured to rotate a blower and the method comprises rotating the blower...
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7567749 |
Motor control circuit
A motor control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a waveform-shaping circuit connected between the PWM signal generating circuit and...
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7567046 |
Motor-driving apparatus
An object of the present invention to accurately and reliably detect rotational positions of a rotor irrespective of noise overlapping inductor voltage. Employed for accomplishing the...
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7560897 |
Current controller and current offset correction
To provide a current controller capable of constantly detecting an offset value of a current detection system, the offset value overlapping with a current detection value, in a state of regular...
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7548038 |
Controller for motor
A controller for a motor is capable of reducing the amount of energization required to operate a motor under a predetermined condition, the motor having two rotors disposed around a rotating shaft....
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7541760 |
Method capable of controlling brushless DC motor
A method capable of controlling brushless DC motor detects the magnetic pole positions of the rotor with a Hall component to produce a Hall signal correspondingly, generates a PWM signal based on...
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7538515 |
Motor controller
A motor controller includes an inverter circuit, a speed detector, an amplifier, a voltage detector, and an offset voltage addition circuit. The inverter circuit drives a motor based on a PWM...
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7535188 |
Motor driving apparatus, motor driving method and disk driving apparatus
A motor driving apparatus includes a neutral point difference voltage detecting unit operable to detect a difference voltage between a virtual neutral point of a resistor circuit connected in...
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7528569 |
Inverter circuit free from power-source-voltage fluctuation
An inverter circuit includes a bridge circuit constituted of a plurality of pairs of a high-side switching element and a low-side switching element, a command signal processing section, a pulse...
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7525264 |
Shunt regulation apparatus, systems, and methods
In some embodiments, an apparatus and a system, as well as a method and an article, may include receiving shunt current in one or more conductors according to a sensed component of power...
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7521889 |
Method of braking induction motor and control apparatus
In a DC braking method for stopping an induction motor, torque shock generated by an abrupt change of an output current phase is reduced to a predetermined value or less when a switch-over from a...
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7521883 |
Motor current shaping
A method and apparatus is disclosed for generating a drive signal that is applied to a coil in a motor. The drive signal is applied during a period (commutation period) between a commutation event...
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7518335 |
Method and apparatus for PWM control of voltage source inverter to minimize current sampling errors in electric drives
A method for controlling an alternating current (AC) motor includes choosing a pulse sequence based on a ripple current in the AC motor at a sampling instant; and providing a voltage to the AC...
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7518334 |
Method and device for controlling a brushless DC motor
A method and a control device for a brushless DC motor, which has an AC/DC inverter supplied by an intermediate direct voltage circuit for feeding the DC motor, a pattern generator for controlling...
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7518328 |
Method and device for commutating electromechanical actuators
The invention relates to the commutation of electromechanical, commutatorless actuators, more particularly of permanent magnet motors and reluctance motors, having a rotor and a stator including at...
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7514894 |
Driver for a brushless motor and data reading/writing device comprising a brushless motor controlled by such a driver
A driver for a brushless motor ( 10 ) is described comprising a static position sensing device ( 22 ), a back EMF detector for detecting a back EMF voltage ( 40 ), comprising a filter ( 42 ). The...
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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...
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7508153 |
Method and device for determining the rotary speed of an electrical machine
A method for determining the rotary speed of an electrical machine, especially of a direct current motor, which is controlled in PWM operation, the tracking voltage of the electrical machine being...
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7501781 |
Pulse-width-modulation motor drive circuit having potential limiter
A PWM motor drive circuit includes a drive IC member, a PWM converter circuit and a potential limiter. The drive IC member electrically connects with a motor coil and further includes a pin...
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7495412 |
Motor driving using discrete time oscillator
A pulse width modulator includes a discrete time oscillator, a data storage device, a data processing block, a counter, and a comparator. The discrete time oscillator generates a first address of...
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7495407 |
Fan rotational speed controlling circuit
A circuit for controlling rotational speed of a fan includes a sensor, a first chipset, and a second chipset. The sensor detects an ambient temperature and generates a corresponding temperature...
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7495399 |
Power output apparatus and vehicle including the same
A coordination control device of a power output apparatus includes a coordination control unit. The coordination control unit calculates an intermediate value between the maximum value and minimum...
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7482768 |
Hybrid electric lawnmower having dual power supply
A hybrid electric lawnmower having dual power supply is described which includes an electric motor operating the blade and the ability to drive the motor from either 120 VAC line voltage or from a...
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7479757 |
System and method for a cooling system
Certain exemplary embodiments can comprise a system comprising an electric drive system for a machine. The system can comprise a rectifier adapted to convert AC power from an alternator to DC...
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7479754 |
Hybrid electric lawnmower
A hybrid electric lawnmower is described which includes an electric motor operating the blade and the ability to drive the motor from either 120 VAC line voltage or from a battery pack. There is a...
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7474069 |
Circuit for using the sign transitions of a motor phase and a motor phase back EMF currents to control PWM
A circuit for optimizing power transferred from an inverter circuit to a motor, the circuit using an open loop method to start-up the motor and have it reach a minimum speed, each phase of the...
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7471526 |
Method and apparatus to reduce PWM voltage distortion in electric drives
Methods and apparatus are provided for reducing voltage distortion effects at low speed operation in electric drives. The method comprises receiving a first signal having a duty cycle with a range...
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7466100 |
Digital high-resolution controller
Kinematic control of an electronic positioner and its associated actuator is effected through a control algorithm that delivers energy to the actuator based on observed motion produced by a...
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7459879 |
Motor controller
A control apparatus for an electric motor, in which a current controller giving multiphase voltage commands to a drive circuit for an inverter includes a normal-mode current controller for use in a...
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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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7449860 |
Control technique for limiting the current of an induction machine drive system
A method and apparatus for deriving phase voltage control signals for use in controlling current flow to an induction motor. The method may comprise obtaining an error term; converting the error...
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7449854 |
PWM signal generation apparatus and method thereof and motor control apparatus and method thereof
A PWM signal generation of the present invention includes a counter, a compare register, a comparator comparing a compare value of the compare register with a count value of the counter and...
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