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Match Document Document Title
8179065 Position sensorless control of permanent magnet motor  
Systems and methods of controlling a permanent magnet motor without a mechanical position sensor are provided. In accordance with one embodiment, a motor control system includes an inverter...
8159171 Controller and method for adaptively adjusting motor driving current waveforms  
The present invention discloses a controller and a method for adaptively adjusting motor driving current waveforms. According to the present invention, the controller receives multiple different...
8154230 Chopper control system for rotary machines  
A control apparatus is to drive a power converter. The power converter has a power supply unit, a switching member electrically connected to the power supply unit, and a power accumulator...
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...
8118565 Blower and electric device with such blower mounted thereon  
A supply current control circuit controls the voltage of a low-voltage direct-current power source so that the average current of an inverter circuit detected by a current detecting circuit becomes...
8078425 Device for detecting the angular position of a rotor of a polyphase rotary electrical machine and rotary electrical machine containing such a device  
A device for detecting the angular position of a rotor of a polyphase rotary electrical machine contains a stator and a plurality of magnetic field sensors (200) delivering first signals...
8076895 Method and device for generating signals for controlling multi-phased rotating electric motor  
A method wherein the signals (SW1, Sw2, Sw3) controlling the power supply (10) of the phase windings (4) of the motor consist of signals (So1, So2, So3) that are out-of-phase by a phase angle (f)...
8067912 Interface cord and system including an interface cord  
An interface cord is operable to connect an external controller to an electrical machine. The interface cord includes a first connector having a first pin configuration, a cable coupled to the...
8026682 Circuit arrangement  
The invention specifies a circuit arrangement (1, 20) for controlling a brushless electric motor (37) with a control chip (2), particularly a microcontroller, which has a number of PWM contacts...
7965052 Motor driving system and method for starting a motor  
A method and system is provided for starting a motor which is useful, among other things, is useful for motors under unknown or variable load/inertia conditions. If a first attempt to start the...
7965057 Method for operation of a three-phase rotating electrical machine, and an apparatus for carrying out the method  
A method and apparatus are provided for operation of a three-phase rotating electrical machine which has at least two stator winding sets and each stator winding set has three phase windings...
7932685 Control apparatus for power conversion apparatus and power conversion system  
The control apparatus for a power conversion apparatus having chopper circuits and a capacitor, each of which includes a switching circuit and a coil, the switching circuit being on/off-controlled...
7923953 Linearity for field weakening in an interior permanent magnet machine  
Systems and methods are disclosed to provide torque linearity in the field-weakening region for an electric (e.g., IPM) machine. The systems and methods implement a field weakening and a torque...
7893643 Pair pole asymmetry compensation in back electromotive force zero cross detection  
Disk drive spindle jitter is comprised of electrical noise, error due to pair pole asymmetry, and random disk speed variances. Error caused by pair pole asymmetry can be identified and compensated...
7816877 Brake-controllable brushless motor  
A brake-controllable brushless motor has a rotor and a stator having polyphase coils; a polar position detector whereby electric power is supplied to the coil selected by its phase in response to...
7801434 Focus controller and optical apparatus using the same  
A focus controller configured to control focus of an optical element includes a focus state detector configured to detect a focus state based on a contrast value of an image formed by the optical...
7777436 Sensorless drive for unipolar three phase brushless DC motors  
A system for controlling a trapezoidally (square wave) driven DC motor includes a unipolar commutation circuit coupled between a DC power supply and a brushless DC motor. The motor has three phases...
7764032 Electronic commutation method and related apparatus  
A method and apparatus for electronic commutation of a pulse width modulation (PWM) controlled motor involves temporarily increasing the frequency of one or more PWM drive signals applied to the...
7759886 Linearity for field weakening in an interior permanent magnet machine  
Systems and methods are disclosed to provide torque linearity in the field-weakening region for an IPM machine. The systems and methods adjust the q-axis and the d-axis components of the stator...
7701158 Fan system and speed detecting device thereof  
A fan system includes a driving device, a speed detecting device and a logic device. The driving device generates a speed detecting signal and a predetermined alarm signal. The speed detecting...
7609016 Systems and methods for driving a motor  
A control system includes a controller configured to provide a drive signal, and a switching device configured to generate an output control signal as a function of the drive signal in an on-state...
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...
7550937 Method for detecting initial magnetic pole position in permanent-magnet motor  
A method for detecting initial magnetic pole position in permanent-magnet motor first determines a PWM pulse width Dt applied to stator, where the PWM pulse width Dt depends on motor parameters....
7511441 Semiconductor integrated circuit, drive circuit, and plasma display apparatus  
A semiconductor integrated circuit capable of reducing the influence of the difference in ambient temperature etc. and realizing a stable phase adjustment circuit has been disclosed. The...
7288922 Control apparatus for automotive alternator having capability to accurately detect temperature of alternator  
A control apparatus for a vehicle generator includes a switch, a regulator, a fault condition detector, and a PWM signal generator. The switch is selectively turned on and off so as to...
7288906 Manually operated brushless direct current motor  
A manually operated brushless DC motor is disclosed herein, which is an educational electric motor and can overcome the shortcoming hard to visualize the movement of a motor due to the high-speed...
7288905 Integrated circuit and method for trainable control and operation of DC motor  
A method and device for control of a low-cost DC motor such as that suitable for portable or battery-powered applications are disclosed such that an intended behavior for the motor may be...
7230400 Electronically commutated motor  
In an electronically commutated motor (M), rotor position signals are generated by means of a galvanomagnetic rotor position sensor (40). A timer (CNT_HL) brings about an advanced commutation which...
6611117 Drive circuit for a brushless DC motor  
A drive circuit for a brushless DC motor controls at least one of a number of possible operation features of the motor. The drive circuit includes a driver stage for providing a current for a...
6580235 Electric motor with two modes of power supply switching  
An electronically switched motor includes a stator-rotor assembly fitted with three-phase driving windings, a series of switches for powering the windings, and a control circuit suitable for...
6570351 Sensorless motor driving apparatus  
When a rotor of a brushless motor 1 is at rest, excitation is performed three times such that excitation phase is switched each time an excitation is performed thereby to ensure that the rotor...
6512342 Brushless motor driving device  
A brushless motor driving device is so configured to control excitation of each phase armature coil an the basis of starting patterns supplied from a start circuit in a starting operation and a...
RE37825 Data storage device having a drive mechanism for rotating a data storage medium  
A data medium is driven by a brushless direct current motor and possesses control signals on a track which can be picked up by a sensing device and supplied to a switch arrangement for activation...
6356042 Engine shut off system for a hybrid electric vehicle  
An engine shut off system for a hybrid electric vehicle includes an internal combustion engine, an electric motor, and a controller. The internal combustion engine is located in the hybrid electric...
6271638 Brushless D. C. motor and control assembly  
An energy efficient low-power integral electronically commutated fan motor and control circuit assembly mounted on a circuit board for use in refrigerators utilizing a Hall sensor to provide...
6239563 Electronic starting and operating control system for a single-phase synchronous motor with a permanent magnetic rotor, also in case of failure  
Control of the start-up and operation of a single phase synchronous motor with a permanent-magnet rotor (9) is proposed, wherein the single-phase synchronous motor (1) comprises at least one stator...
6239564 State advance controller commutation loop for brushless D.C. motors  
A method and system for advancing the state of commutation of an electronically commutated brushless D.C. motor. Impending motor stall is detected by measuring current flow through the motor...
6160367 Apparatus and method for driving motor  
An apparatus and method for driving a motor with a reduced current flowing in the motor, as well as reduced vibrations of the motor at a start-up is provided. The motor driving apparatus has a...
6150779 Motor drive apparatus and method  
A motor drive apparatus for driving a motor with power derived from a main power source, including a signal input device configured to input a start signal and a stop signal to initiate starting...
6034496 Motor speed control using fixed-duration torque bursts  
A motor controller controls motor rotational speed by repeatedly executing a sequence of operations. Initially, a pulse is generated that causes a predetermined fixed current to be supplied to the...
5726546 Agitation period control of laundry machine motor  
A laundry washing machine in which the period of each agitation stroke (comprising "ramp", "plateau" and "coast" phases) is controlled by adjusting the "coast" phase of each stroke in order to...
5550447 Pulse generating system responding to instruction pulses for generating driving pulses for diving motor  
A pulse generating unit responds to a series of instruction pulses to generate a series of driving pulses which includes alternately occurring first driving pulses and second driving pulses. The...
5459385 Variable reluctance drive system  
A variable reluctance drive system including a motor and corresponding converter for improved current commutation is described. The motor incorporates a salient pole rotor and a salient pole stator...
5397972 Start-up procedure for a brushless, sensorless motor  
A method for starting-up in a desired forward sense of rotation a multiphase, brushless, sensorless, DC motor, while limiting the extent of a possible backward rotation. First, a predetermined...
5376866 Motor controls, refrigeration systems and methods of motor operation and control  
A method of operating a brushless motor having a stationary assembly with at least two different energizable windings for producing spaced apart magnetic fields in time sequence, and a rotor...
5298838 Sensorless brushless DC motor starting system and method  
A method for starting a sensorless brushless DC motor. The present invention uses the physical equations of motion of the motor to calculate commutation advancement rates during the motor's...
5221881 Method and apparatus for operating polyphase DC motors  
A circuit for operating a polyphase dc motor, for example of the type having a plurality of "Y" connected stator coils, has circuitry for unambiguously determining the actual instantaneous position...
5206567 Apparatus for reliably activating sensorless and brushless DC motor  
When a sensorless and brushless DC motor is started, the rotor having a magnet is positioned by first exciting one pair of motor coils and then exciting another pair motor coils. The excitation of...
4983894 Brushless motor driving system  
In a system for driving a brushless motor having motor drive coils connected to respective drive transistors, voltages induced in the drive coils when the motor is rotating are continuously...
4922169 Method and apparatus for driving a brushless motor  
An n-phase, m-pole (wherein n and m are integers) brushless motor is driven without use of physical rotary position detectors, such as Hall elements or the like. An harmonic component of back emf...
Matches 1 - 50 out of 63 1 2 >