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8143830 |
Brushless motor apparatus
A blushless direct current (BLDG) motor apparatus includes: a stator which is provided with a plurality of windings corresponding to N phases and wound in parallel independently of each other; a...
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8134318 |
System and method of current shaping control for retract
A system for implementing current shaping for retract of a voice coil motor (VCM) includes drive circuitry coupled to drive the VCM according to a logic state of the system. Current shaping...
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8115434 |
High-speed self-cascaded electric machine
An electric machine is disclosed comprising a first energy source, a second energy source, and a stator which comprises a first set of windings and a second set of windings. The electric machine...
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8093855 |
Low speed control method and apparatus for servo motor
A low speed control method and an apparatus for a servo motor. The control apparatus comprises: an encoder capable of acquiring a speed signal from a servo motor and encoding the speed signal to...
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8089233 |
Physical quantity conversion sensor and motor control system using the same
A first sensor element outputs a first output signal in correspondence to a direction of the magnetic flux lines acting from the outside. A second sensor element outputs a second output signal...
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8004230 |
Device for controlling a rotary press
A device for controlling a rotary press is provided. The device includes a main evaluation unit which is provided with a main signal inlet, at least a first main signal outlet and a first main...
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7973500 |
Control apparatus for motor
A normal revolution number calculation unit calculates a normal revolution number of a driving motor generator in every control period, based on a signal from a rotational position sensor. A moving...
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7960932 |
Method for controlling an electrical door drive
Disclosed is a method for controlling an electrical door drive by means of which the door drive is switched off if the maximum torque is overshot and/or a defined nominal closing rate of the door...
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7944164 |
Method and apparatus for identifying orientation of a stationary rotor in a sensor-less PMSM
A method and apparatus for determining rotor position in a stationary rotor of a sensor-less permanent magnet synchronous machine that employs a rotating magnetic field to identify a magnetic axis...
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7915844 |
Motor driving apparatus and method for control of motor revolution
This invention provides a motor driving apparatus that made it possible to reduce torque ripples including those attributed to load variation of the motor and an associated method for control of...
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7884580 |
Constant-power brushless DC motor and the generator thereby
The present invention relates to a constant-power brushless DC motor and a generator using the same, and in particular, to a constant-power brushless DC motor and a generator using the same, which...
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7586284 |
Synchronization control system
A synchronization control system includes plural controlling object apparatuses connected through first and second wired OR lines. Each controlling object apparatus includes a function of switching...
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7586276 |
Electronically commutated motor and method for controlling the same
The invention relates to an electronically commutated motor (10) and to a method of controlling an electronically commutated motor (10). In order to reduce commutation noise, it is proposed to...
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7417392 |
Electronic line shaft with phased lock loop filtering and predicting
An improved electronic line shaft provides for a predictor sending predicted position and/or velocity values to servant drives that may be later strobed in by high speed low-latency strobe signals...
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7411124 |
Self-calibrating transducer system and musical instrument equipped with the same
A self-calibrating key sensor system is constituted by an optical modulator, optical position transducers, a data accumulator and a data analyzer, and the optical modulator has a gray scale section...
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7248006 |
Electronically controlled electric motor
A system for controlling an electric motor comprises, in one embodiment, an encoder; a central processor in communication with said encoder; a module processor in communication with said central...
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7221858 |
Pulse-width modulation motor speed control circuit
A PWM motor speed control circuit (10) includes a PWM signal generator (20), a driver integrated circuit (IC) (101) and a photocoupler (30) coupled between the PWM signal generator and the driver...
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7187152 |
AC servo drive without current sensor
An AC servo drive without current sensor includes a PI (proportional integration) controller, at least two first-order controllers (polar point and zero point), a decoupling compensator, a...
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7183730 |
Method and apparatus for receiving and manipulating sheet material
Disclosed are systems and methods for receiving and manipulating the travel of a sheet material, such as paper, from a device such as an imaging device. One embodiment of a system can be...
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7164243 |
System and method for establishing motor efficiency during balanced or unbalanced operating conditions
A system and method for establishing a plurality of operating parameters of a multiphase motor. The plurality of electrical parameters may be established from stator resistance data and electrical...
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7161314 |
Motor control apparatus having current supply phase correction
In a motor-driven shift position switching device, when the difference between a target position and the rotation position of a rotor has become smaller than a prescribed value in a motor feedback...
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7102318 |
Servo motor with a built-in drive circuit
A servo motor with a built-in drive circuit in which a sensor circuit portion, a drive control circuit portion, and a motor drive circuit are collectively provided on two boards, thereby achieving...
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7053586 |
Brushless repulsion motor speed control system
A system for controlling the speed of a brushless repulsion motor having a series of switches mounted on a rotating armature for shorting circumferentially spaced armature coils comprising first...
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RE39076 |
Apparatus and method for controlling brushless electric motors and position encoders and indicating position thereof
A brushless direct current motor is energized by a power stage. Switches of the power stage are selectively switched by an electronic control device. In order to determine the correct commutation...
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7009360 |
Method for controlling SRM switching angle by analog encoder system
Disclosed is a method for controlling an SRM (Switched Reluctance Motor) switching angle by an analog encoder system that can perform a precise control of the switching angle of the SRM by...
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6992451 |
Motor control apparatus operable in fail-safe mode
In a motor feedback control, the current supply phase is set on the basis of the encoder count of an encoder and the current supply phase is also set on the basis of the encoder count by...
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6940237 |
Washing machine with brushless commutating drive motor
In a synchronous motor with a permanent-magnet rotor for driving a washing machine to make commutation which is sensor-controlled in dependence on the rotary position of the rotor more precise, it...
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6741048 |
Pulse-controlled electronically commutated motor
The invention relates to an electronically commutated motor (1) comprising P phases and N pairs of poles, in which a circular multipole encoder (12) is associated with the rotating ring (6a) of an...
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6686713 |
Pulse-controlled electric power-assisted steering system
The invention relates to an electric power-assisted steering system making it possible to apply an assist torque for the angular displacement of the wheels of a vehicle, said torque being applied...
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6683427 |
Device for controlling an electronically commutated motor
The invention relates to a device for controlling an electronically commutated motor (1) comprising P phases and N pairs of poles (5), said device comprising: a circular multipole encoder (4)...
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6400118 |
Magnetic-pole position detecting apparatus for a synchronous motor
A magnetic-pole position detecting apparatus for a synchronous motor includes an arithmetic section outputting six voltage vectors having equal amplitudes and equal-interval phases to a circuit...
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6359401 |
Multi-phase bipolar brushless D.C. motor
A multi-phase bipolar brushless D.C. motor having an embedded permanent magnet as a rotor, an armature as a stator and a plurality of windings are sub-wound on the stator in parallel and...
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6359400 |
Direct drive spindle for use in chemical vapor deposition
A direct drive system for use in, for example, the MCVD process, includes a motor housing affixed to a lathe headstock which contains electrical motor windings, and forms the stator of the motor. A...
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6232731 |
Multi-channel motor winding configuration and pulse width modulated controller
A multi-channel motor winding configuration providing low harmonic distortion and a PWM inverting controller for this type of winding configuration are disclosed. The motor winding configuration...
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6204625 |
Driving apparatus for stepping motor
A driving apparatus equipped with a step controlling circuit drives stepping motors in a micro stepping manner. An encoder which detects a mover position of the motor supplies a signal to the...
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5936374 |
Repulsion motor
A brushless repulsion motor in which the rotor carries electronic switch circuits for selectively shorting the rotor windings at appropriate times in its rotational cycle. A non-contact reference...
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5932979 |
PWM speed-control apparatus for elevators
A PWM speed regulating apparatus for DC elevator comprises a rectifier-filter (1), voltage suppressor (2), chopper voltage regulator (3), system controller (4) and a driving protector (5). The...
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5903118 |
Disc rotor air cooled D.C. motor
A brushless direct current (DC) electric motor includes a rotor and a stator. The rotor has at least one disc mounted to a central shaft. The disc has an outer portion consisting of permanent...
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5859510 |
Commutation board for brushless motor
A board for commutation of a brushless motor having an encoder comprising a plurality of Hall-effect sensors operative for providing commutation information to a motor controller including an...
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5744921 |
Control circuit for five-phase brushless DC motor
A control system (100) for a five-phase brushless DC motor (102) including a stator having five windings and a rotor (116) mounted for rotation relative to the windings (114). The windings (114)...
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5675231 |
Systems and methods for protecting a single phase motor from circulating currents
A single phase motor system and method for preventing excessive circulating currents in the motor. The motor has a power supply link including power switches responsive to a motor control signal...
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5568025 |
Abnormally detecting device for relay
There is disclosed a device for detecting an abnormality in relays which is adapted such that if there is a current flow through a motor (M) when first and second transistors (Q1, Q2) are off...
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5548196 |
Switched reluctance motor driving circuit
A switched reluctance motor driving circuit, by which energy can be used efficiently, the inverse-phase braking is possible, and the torque ripple can be controlled through the change of the...
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5410235 |
Method and apparatus for sensing the rotor position of a switched reluctance motor
Apparatus and method for detecting rotor (12) position in a switched reluctance motor (18) having multiple stator phases (A-A', B-B', and C-C'). A multiplexer (48) intermittently connects a known...
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5406184 |
High-speed plural-phase reluctance type motor including a plurality of semiconductor switching elements each repectively connected to one of a plurality of armature coils for quickly reducing or building up exciting current
Armature current is maintained at a predetermined level by a chopper circuit, and part of the magnetic energy stored in magnetic cores of armature coils is transferred to a small-capacitance...
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5400876 |
Method of calibration of hysteresis brakes
A hysteresis brake including a casing having internal alternating first slots and first teeth, a pole having external alternating second slots and second teeth, a rotor including an annular portion...
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5402045 |
Motor drive having invertor
A motor drive includes an invertor (5) with which a motor (6) is rotated at a variable speed. To suppress noises caused by ripple components contained in currents flowing in phase coils of the...
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5400191 |
Electronic index pulse generating system for speed control in rotating disk data storage apparatus
An index pulse generating system utilizes two periodic motor speed signals, one generated by a speed sensor coil actuated upon by a permanent magnet rotor mounted to a turntable, and the other...
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5399953 |
Motor control and drive circuit
A peak level of a drive signal U having predetermined inclination portions is detected, and a detection signal Q is outputted when the peak level has not reached a predetermined value. Since the...
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5398298 |
Acceleration controller for laundry machine motor
A method of cyclically accelerating an electric motor particularly for use in a laundry machine. A desired speed, direction of rotation and acceleration time is set and power is applied to the...
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