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7362061 |
Gate driver, motor driving device including the gate driver, and apparatus equipped with the motor driving device
A gate driver for forcing a power transistor including a gate electrode insulated with oxide film into conduction or shut-off, the gate driver includes a first current source for outputting a first...
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7358693 |
Motor drive control device
Disclosed is a motor drive control device which uses mechanical switches configured in an H-bridge shape and can protect the mechanical switches from being damaged and minimize a voltage chattering...
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7358692 |
Alignment method
An apparatus includes a motor including a rotor and a coil system comprising a first set of coils, a second set of coils, and a third set of coils; and a switching mechanism that connects the first...
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7352144 |
Motor driving device having MOSFET, MOSFET, and motor having MOSFET
Each connection point of three series circuits formed by connecting two MOSFETs in series between positive and negative terminals of a direct-current power source is connected to a driving coil of...
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7348740 |
Motor control circuit for forward/reverse rotation
A motor control circuit for forward/reverse rotation comprises a driving circuit, a switching circuit and a motor coil winding. The driving circuit has a driving source, a Hall IC and a driving IC....
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7348739 |
Motor driving apparatus
A motor driving apparatus makes a carrier signal of an inverter be synchronized with a carrier signal of a DC/DC converter, and determines a phase difference between both the carrier signals based...
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7339334 |
Real-time responsive motor control system
The present invention discloses a real-time responsive motor control system comprising a central MCU (Microcontroller Unit) core logic and at least one PWM (Pulse Width Modulation) MCU core logic....
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7271556 |
Method and apparatus for estimating rotor position of switched reluctance motor, and method and apparatus for sensorless control of switched reluctance motor
A discrete rotor position estimation method for a synchronized reluctance motor is provided. A d.c.-link voltage V dc and a phase current I ph are sensed. A flux-linkage λ ph of an active phase...
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7253574 |
Effective switching frequency multiplier inverter
A switching frequency multiplier inverter for low inductance machines that uses parallel connection of switches and each switch is independently controlled according to a pulse width modulation...
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6987375 |
Dual-stage drive for switched reluctance electric machines
A dual stage drive for a switched reluctance motor (SRM) is disclosed, the SRM having a plurality of phase coils associated therewith. In an exemplary embodiment, the dual stage drive includes at...
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6731083 |
Flux feedback control system
An electrical machine includes a rotor, a stator operably coupled with the rotor, at least one phase winding operably coupled with the rotor and stator and arranged to establish flux in a magnetic...
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6586897 |
Method of controlling alignment of a rotator of SRM and SRM driving circuit for realizing the same
Disclosed is a method of controlling alignment of a rotor of an SRM with respect to a stator, the SRM including a stator having a plurality of diametrically opposed stator salient magnetic pole...
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6577087 |
Multilevel DC link inverter
A multilevel DC link inverter and method for improving torque response and current regulation in permanent magnet motors and switched reluctance motors having a low inductance includes a plurality...
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6479959 |
Self-excited reluctance motor
A self-excited reluctance motor capable of driving a motor with a commutator and without having to use a commutator logic for power electric circuit. The self-excited reluctance motor includes a...
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6469468 |
SR motor controlling method and SR motor having low peak of current flowing therein
An SR motor includes a stator having a plurality of salient poles and a rotor having another plurality of salient poles. Windings are wound around the plurality of salient poles and magnetic fields...
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6465977 |
System and method for controlling torque in an electrical machine
System and method for controlling the output torque of an electrical machine include a torque controller operable for receiving a motor input command, representative of a desired output torque, and...
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6438321 |
Control of high speed DC motor vertical voltage vector component
A motor controller utilizes sensors to detect the rotational speed and relative position of the motor rotor and generates a voltage vector to maintain the motor current in phase with the EMF before...
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6246193 |
Encoderless rotor position detection method and apparatus
A rotating flux vector is set up in a motor or generator's rotor by simultaneously energizing two phase windings while the rotor remains stationary, wherein each phase winding may be energized by...
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6198239 |
Hysteresis control in switched reluctance motors
A circuit and method for controlling a current level in a switched reluctance motor phase coil are provided. The circuit includes a current sensor for generating a current indicative signal...
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6181092 |
Current control circuit for a reluctance machine
A current controller for a switched reluctance machine is disclosed. The current controller controls the switching frequency of the power devices that control the energization of the phase windings...
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6137256 |
Soft turn-off controller for switched reluctance machines
A circuit for controlling the operation of switched reluctance machines (i.e., motor or generator) having a plurality of phase windings. The circuit slows down the initial "turn off" of the phase...
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6137253 |
Method of PWM driving a brushless motor with digitally stored voltage profiles with reduced losses
A method is for driving a multiphase brushless motor with N windings connected in a star or in a polygonal configuration. The windings are driven according to a certain periodic voltage profile....
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6137248 |
Sensing load and/or speed changes in a switched reluctance motor through current chopping
A method for detecting a change in motor load and/or motor speed is provided. The method includes the step of measuring the number of transitions (i.e., state changes) of a phase control signal in...
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6133656 |
Brushless commutated torque motor for use with a rotary low frequency sound reproducing apparatus
A brushless commutated torque motor suitable for use with a rotary low frequency sound reproducing apparatus, includes a shaft having a longitudinal axis, a position sensor, a rotor having a...
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6130989 |
Motor drive circuit
In a motor, drive transistors (7, 9) are turned off by drive signals I, J output from a control circuit (10) at a point adjacent to a phase changeover point of the energizing to drive coils (1, 2),...
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6118245 |
Control device and control process for motors
The invention relates to control device and control process for motors. In order to prevent phase distortion and the like in controlled systems, a sensor (250) for detecting the state of movement...
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6114826 |
Stepping motor driving apparatus having small time constant regenerative current path
In an apparatus for driving a stepping motor in a micro step manner by a PWM control signal generated based on a sense voltage, including a sense resistor for generating the sense voltage, a...
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6111380 |
System for detecting abutment and blocking in a stepped motor
A stop and jamming detection system in a stepping motor determines a parameter from the profile of an instantaneous motor variable and compares it to a reference value. A signal for the stop and...
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6108488 |
Speed control system for repulsion motor
A speed control system for a brushless repulsion motor of the type including a series of armature mounted switches for shorting circumferentially spaced armature coils, said system comprising: a...
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6107776 |
Inverter control device
The invention includes: a random number generating unit which outputs a random number in driving of an AC motor by a voltage source inverter, a maximum/minimum triangular wave frequency setting...
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6107772 |
Sensorless switched reluctance motor control
A method for controlling a motor and a circuit for implementing the method are provided. The method includes the steps of providing current to a first phase coil of a motor and measuring the time...
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6107764 |
Drive control for a switched reluctance motor
A control circuit and method for controlling a switched reluctance motor are provided. The control circuit includes a tone wheel and a Hall effect sensor for generating a position feedback signal...
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6104113 |
Coil assembly for sensorless rotor angular position control of single phase permanent magnet motor
A coil assembly for sensorless rotor angular position control of a single phase permanent magnet motor. The coil assembly is positioned axially adjacent one end of the motor's rotor core in...
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6091221 |
Motor driving apparatus for perfoming high-speed rotation by phase detection control
A motor driving apparatus including a stepping motor constituted by a stator having at least two poles. The driving apparatus includes a circuit for biasing one terminal of a driving coil of a...
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6087799 |
Switching circuit for a reluctance machine
A switching circuit for a reluctance machine includes one or more half-bridge converter modules including serially connected switches connected between power rails +V dc and -V dc . A pair of...
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6087793 |
Circuit for controlling a motor with a device for recognizing an overload
A circuit arrangement for cycled control of a motor, includes an overload detection device which has a signal sensing stage. Reliable detection of a motor overload is achieved, substantially...
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6087654 |
Encoder apparatus and methods
Apparatus and method for producing a resultant output signal from at least two output signals generated by an encoder. The apparatus and methods include: (a) generating a first output signal from...
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6084378 |
Variable slew rate pulse width modulation system
A method and a circuit for controlling a slew rate of a coil in a voice coil motor in a disk drive system. A slew rate control signal is generated by a microprocessor or by an analog circuit in...
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6084376 |
Low cost resolver system
A resolver (10) is excited with a high frequency signal from excitation circuit (16). Outputs of the resolver (10) are transmitted through receiver circuit (24) and input to a DSP signal processing...
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6081103 |
Method for regulating the excitation current in a motor vehicle alternator by digital processing, and a regulating device for carrying out the method
The excitation current in the rotor winding of a motor vehicle alternator is regulated by this method. The alternator produces a rectified output voltage to be regulated, this output voltage being...
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6081091 |
Motor controller, integrated circuit, and method of controlling a motor
A motor controller includes an input terminal (22), a frequency selective network, a first controller, and a second controller. The input terminal is adapted to be coupled to a drive phase of a...
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6081086 |
Method and apparatus for electrically braking a motor
Converter-powered electric motors are often braked by electrical means. For this purpose the electronic converter that powers the motor is so controlled that the motor, when in generational...
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6081080 |
Method and apparatus for reducing voltage stresses in electric machines
A method and apparatus for reducing winding failures in electric machines resulting from the application of high frequency or high dV/dt voltage pulses or voltage signals to the phase windings of...
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6078161 |
Current control apparatus in a switched reluctance motor
Disclosed is a current controlling apparatus of a switched reluctance motor (SRM) having an inverter unit for variably switching the excitation state of each phase of the polyphase stator:...
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6078158 |
Disk drive motor spin-up control
A motor control processor controls motor spin-up in a disk drive by detecting environmental temperature at the spindle motor of the disk drive, controlling commutation phase advance to generate...
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6078152 |
Bidirectional E.C. motor and method of operating the motor
In a method of starting a two-pulse electronically commutated dc motor, which is designed for operation in a preferred direction, for purposes of startup in a desired direction, the following steps...
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6067960 |
Method and device for controlling the volume of intake air for an engine
To improve the controllability of an energization current for a motor, when electricity is applied to each stator coil for a predetermined energization time in accordance with a plurality of...
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6067202 |
Method and apparatus for controlling spindle motor commutation switching times in a disk drive
A method and apparatus for controlling a spindle motor having at least one winding in a storage device are proposed, the storage device having at least one data storage medium rotatably supported...
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6064191 |
Current transducer and current-monitoring method
A current transducer includes a current transformer in which the conductor carrying the current to be monitored constitutes the primary. The transformer secondary is wound on a toroidal core. The...
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6064175 |
Sensorless three-phase brushless DC motor drive circuit
A drive circuit for a sensorless three-phase brushless DC motor provides improved drive characteristics by generating a pseudo back-electromotive signal in response to the voltages of the stator...
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