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Document Title |
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8154238 |
Accurate and versatile back EMF sensor
A filter representing a complex impedance of a motor system based on a deviation between a first voltage driven by a command signal and a second voltage driven by the command signal can be...
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8080968 |
Drive control device for a stepper motor and drive control method of the stepper motor
A stepper motor control device includes a control device that controls an operation of a stepper motor. The control device implements a target rotational angle change computation process that...
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8004222 |
Negative sequence carrier signal controller
A negative sequence feedback circuit is connected to monitor and minimize unbalances in a high-frequency ac carrier signal provided to a motor/load for the purpose of detecting rotor position. The...
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7876062 |
Brushless electric machine and apparatus using the same
A first member has a magnet assembly that includes at least one permanent magnet pair, and a second member includes an electromagnetic coil. A control circuit controls the supply of power to the...
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7834565 |
Method of controlling a brushless DC motor
A method of controlling a brushless DC motor of the type having a stator, comprising a stator winding excitable to generate a stator magnetic field, and a rotor, arranged to rotate with respect to...
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7791293 |
Motor controller and electric power steering system
A current sensor of a motor controller detects the current applied to a motor drive circuit and thus a phase where a failure cannot be detected would occur without taking any measures. However, an...
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7733040 |
Brushless motor
In the m phase brushless motor, n (n
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7723943 |
Receiving method
A receiving method is provided comprising the following steps. First, a receiving device is provided, wherein the receiving device comprises a chamber, a plurality of spacers, a spacer moving...
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7671556 |
Image sensing apparatus
An image sensing apparatus, which has a constant-voltage driven stepping motor, comprises a PWM waveform generation part that generates pulse signals to be applied to switching devices; and a PWM...
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7612512 |
Electronic control unit for controlling external half-bridge power output stages and an electric motor operated drive with electronic control unit
In order to control an electromotive drive, a control unit has control modules for controlling half-bridge end power stages. Two of the control modules are pre-configured for alternatively...
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7489096 |
Rotor position detection of a brushless DC motor
A method of determining the angular position of the rotor of a brushless direct current motor having a stator with multi-phase windings, control circuitry that provides excitations switched after...
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7466092 |
Polyphase motor
A multiphase motor includes a fixed part or stator energized by electric coils and a mobile part or rotor including N pairs of poles radially magnetized in alternate directions, N being not less...
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7427841 |
Driving method and driver of brushless DC motor
A method of driving a brushless DC motor includes operations of rectifying an AC voltage of an AC power source by a rectifier circuit to which a capacitor is coupled between its output terminals...
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7279864 |
Control unit for driving a regulating transistor of a fan arrangement
A control unit for driving a regulating transistor (2) of a fan arrangement, in which the regulating transistor (2) is connected in series with an electronically commutated fan (1), having control...
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7164250 |
Open-loop voltage driving of a DC motor
The driving voltage of the motor is incremented a quantity proportional to the speed of the motor according to a proportionality factor that is adjusted to compensate the back electromotive force....
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6762574 |
Brushless motor, control method for brushless motor, light deflection device, and control method for light deflection device
The invention concerns a light deflection device, and a control method for the light deflection device, which are rich in expandability of drive control. The light deflection device includes a...
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6646395 |
Throttle body
A invention relates to a throttle body which has at least one housing (14) and an actuator (18), which is arranged in the housing (14) and drives a moving element (6). The outlay on the production...
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6633144 |
System and method for measuring parameters of a DC motor field
A system and method determine the parameters of a field of a DC motor. The method comprises obtaining parameters of the DC motor; and performing an iterative processing loop, the iterative...
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6504329 |
Apparatus and method for controlling permanent magnet electric machines
A control scheme for an surface-mounted permanent-magnet synchronous (SMPMS) drive uses a combination of an open-loop magnetizing current reference calculation and a stabilizing feedback term,...
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6331757 |
Staggered pulse width modulation apparatus and method for EMI minimization in motor
An apparatus and method for minimizing electromagnetic interference in a unipolar phase motor having a supply current is provided. The motor further has a plurality of motor phases energizable with...
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6316895 |
Multi-speed motor controller
Three phase sinusoidal waveforms generated from a DC bus voltage using Space Vector PWM method are used to obtain multi-speeds from a 3 Phase AC Induction motor. A novel algorithm generates the...
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6107763 |
Closed loop and open synchronization of the phase switchings in driving a DC motor
The synchronizing circuit of a digital drive system of an electric motor is configured to function in a closed loop or in an open loop mode by adding a minimum number of elements to the normal...
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5767634 |
Head mounted pulse action facial massager
A pulse action facial massager apparatus including a headset assembly for mounting to a user's head. A pair of flexible extension fingers extending from opposite sides of the headset assembly each...
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5705902 |
Halbach array DC motor/generator
A new configuration of DC motor/generator is based on a Halbach array of permanent magnets. This motor does not use ferrous materials so that the only losses are winding losses and losses due to...
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5668450 |
Half-wave, brushless, four-phase DC motor with bifilar windings
A half-wave brushless, four-phase DC motor includes sets of four stator windings fed at 90° phase increments by four switches. The 0° and 180° windings are wound about their magnetic stator po...
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5420486 |
Multiple motors controllers
This invention is for incrementally controlling energizing and de-energizing of at least two electrical motors in which motor armatures are mechanically coupled to a single mechanical member and in...
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5294872 |
Method and apparatus for operating vacuum cleaner
Method and apparatus for operating a vacuum cleaner in which by detecting a rotational speed of a variable speed fan motor adapted to give a suction force to the cleaner and its change range, the...
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5293518 |
Multiple two-node windings electrical motors controllers
The invention discloses a controller for controlling an electric motor having a stator and an armature, the stator includes stator magnetic poles, the armature includes multiple two-node, open...
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5254914 |
Position detection for a brushless DC motor without Hall effect devices using a mutual inductance detection method
The present method and apparatus detects the rotor position of a brushless DC motor with an accuracy of π/m electrical radians (where m = the number of motor phases) within one electrical period, ...
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5223772 |
Method and apparatus for providing the lock of a phase-locked loop system from frequency sweep
Synchronization of the output of an internally-driven VCO to an exterior clock signal is obtained by using the exterior clock signal to re-start the VCO at every exterior clock pulse, until the...
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5216339 |
Lateral electric motor
The present invention is a lateral electric motor which can be driven in a single stage drive mode, a two stage drive mode or any other multiple drive stage mode. The main components of the lateral...
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5059875 |
Motor and controller
An apparatus is provided that comprises a DC motor and a controller adapted to control the motor. The motor has a permanent magnet rotor and an electromagnetic stator. The rotor is divided into...
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4990837 |
Dynamic braking apparatus for a motor
A control apparatus for a motor including m number of stator windings and a relay having m-1 contacts, thereby allowing the control apparatus to be simplified in its structure so that the control...
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4847555 |
Device for detecting rotational speed of a motor using first and second sensors and a switching unit to select between the two sensors
A device for detecting the rotational speed of a motor by a first rotational speed sensor and at least a second rotational speed sensor and a switch unit connected to the rotational speed sensors,...
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4847712 |
Disc drive spindle motor with log cogging torque
A spindle motor is adapted to support a hub with one or more discs thereon. The motor comprises a stator with nine windings of equal cross-section and a rotor with eight equally spaced poles...
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4843288 |
Phase locked motor control system for multiple disk drive units
A motor control system and related method are provided for phase and frequency locked operation of multiple spindle motors in a computer disk drive environment or the like, for coupling two or more...
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4843270 |
Electrical machine with unequal pole faces
An electrical machine comprises a rotor (2) and a stator (5) as machine parts, means for generating an excitation flux, and active coils (W1-W5). In operation the coils link at least a portion of...
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4841393 |
Spindle motor for a disc drive
A spindle motor for use in a disc drive including a base casting for the drive, the motor comprising a shaft extending through the base casting and carrying a hub supporting one or more discs for...
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4832576 |
Electric fan
An electric fan comprises a rotary shaft supported on a mounting base plate. The rotary shaft is extended through a cylindrical stator and on a tip of the rotary shaft, the bottom of a cup-shaped...
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4831469 |
Disk drive head retract and motor braking method and apparatus
One phase of a multi-phase spindle motor, normally used to rotate the disk of a disk drive system when power is on, is used to supply power to a capacitor storage circuit when power is lost (turned...
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4818922 |
Optical commutation for permanent magnet motors
The present invention deals with an apparatus and method for starting and running permanent magnet motors based on angular position information using an optical commutation technique. The optical...
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4818908 |
Brushless motor having phase advance
A Brushless motor with phase advance has a rotor having magnetic poll teeth, a stator having plural coils and facing the rotor across a gap, and a bearing for rotatably supporting the rotor. A...
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4810943 |
Method and apparatus for controlling air-conditioning apparatus
In a method and apparatus for controlling an air-conditioning apparatus of a type driving a compressor motor from a DC power source through an inverter, the present current value of a DC input to...
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4806834 |
Electrical circuit for inductance conductors, transformers and motors
An electrical circuit for inductance conductors, transformers and motors is provided wherein two coils of electrically conductive wire are coiled about a bar of magnetizable material such that they...
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4806813 |
Motor
A motor comprises a rotor made of a permanent magnet and pairs of yokes having pairs of magnetic pole parts arranged round the circumference of the rotor. The rotor is arranged to be pivotally...
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4751441 |
Transducer position control system for disk storage equipment
A method and apparatus are disclosed for positioning a transducing apparatus relative to a rotating storage medium through the use of an externally commutated positioning apparatus under control of...
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4710684 |
Drive circuit for brushless DC motors
A drive circuit for a brushless DC motor capable of generating a torque in the acceleration and deceleration directions, respectively, and effective when used in a portable device such as an...
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4684855 |
Permanent magnet direct current motor apparatus
Disclosed is a permanent magnetic direct current motor apparatus which provides high constant torque and constant speed through a large stepping angle under varying output shaft load conditions....
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4665350 |
Open-loop brushless motor control system
The speed command for an open-loop brushless motor speed control system is overridden whenever the speed of the motor is less than a relatively low reference speed in order to quickly accelerate...
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4594524 |
Coreless-brushless motor
In a coreless-brushless motor in which a driving coil block is mounted on a stator yoke, a bearing is fixed to the stator yoke in alignment with the central portion of the driving coil block, a...
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