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7612971 |
Micro-electromechanical system based switching in heating-ventilation-air-conditioning systems
HVAC systems implementing micro-electromechanical system based switching devices. Exemplary embodiments include a HVAC system, including a load motor, a main breaker micro electromechanical system...
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7586286 |
Method and apparatus for motor control
A system and method for controlling a permanent magnet motor are disclosed. Briefly described, one embodiment receives a torque command and a flux command; receives information corresponding to a...
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7573226 |
Motor and motor drive system
Provided is a motor having a combination of a plurality of coil pairs and a permanent magnet, wherein these coil pairs are supplied with an excitation signal from a drive circuit so as to be...
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7560895 |
Indirect rotor resistance estimation system and method
Indirect rotor resistance estimation for an AC induction motor is achieved by successively stepping the quadrature command to zero and the direct current command to a predetermined value causing...
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7528568 |
Vector controller for permanent magnet synchronous motor
A vector controller for a permanent magnet synchronous motor according to the present invention has a motor constant identifying unit for identifying motor constants of the permanent magnet...
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7518333 |
Dynamic reef surge generation
Two apparatuses are disclosed for providing a dynamically varying water surge in a salt-water reef aquarium. The first apparatus is a micro-controller based variable frequency reef surge drive 100...
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7443128 |
Method and device for controlling motors
An electronic device is provided for controlling a motor having three phases driven by a motor driver. In one implementation, the electronic device includes a detection means and a control circuit....
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7417571 |
Method for providing a correlation
A method for providing a correlation between a periodic analog/digital conversion and an angle-synchronous signal, in which the periodic analog/digital conversion is provided with a timing mark,...
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7397216 |
Circuit for monitoring harmonic distortion in the power supply of a synchronous electrical machine with permanent magnet excitation
The present invention provides a circuit for monitoring harmonic distortion in the power supply of a synchronous electrical machine with permanent magnet excitation that comprises a rotor without a...
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7388346 |
Adjustment method of rotor position detection of synchronous motor
To obtain an adjustment method of rotor position detection of a synchronous motor with excellent productivity. An adjustment method of rotor position detection of a synchronous motor, wherein a...
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7339344 |
Self tuning method and apparatus for permanent magnet sensorless control
A plurality of parameters of a Permanent Magnet Synchronous Motor (PMSM) is determined by a motor controller for differentiating between a plurality of PMSMs. This is achieved by first applying...
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7323839 |
Direct current motor controlling method
A direct current motor controlling method includes a mean for transforming a duty signal to computed value by a microprocessor unit. The microprocessor unit computes the computed value and then...
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7288916 |
Pulse width modulation signal generating apparatus having two dead times for on-timings
In an apparatus for generating complementary first and second pulse width modulation signals, a signal generating circuit generates a first signal for causing the first pulse width signal to switch...
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7265513 |
Variable reluctance electric power system
A variable reluctance electric power system which comprises an alternator and a motor having a rotor with longitudinal lobes and no windings, commutators, slip rings, magnets, or laminations. The...
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7245095 |
Control circuit of rotational speed of a fan
A control circuit of rotational speed of a fan is provided, wherein by a switching of a switch unit, a PWM (Pulse Wide Modulation) unit can output a sampling pulse whose period is changing. A...
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7161324 |
Device for estimating pole position of synchronous motor
An influence resulting from double saliency of an electric motor, i.e., an influence of a deviation of the axis of an alternating current due to a rotor magnetic pole position θ on the estimation...
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7148651 |
Apparatus and method for controlling AC motor and module therefor
A method and apparatus for controlling a permanent magnet synchronous motor by accurately detecting 3-phase motor currents from a DC input current in a full voltage range are provided. In the motor...
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7129667 |
Motor controller, library apparatus, conveyance robot for the library apparatus, and computer-readable storage medium with motor control programs
A motor controller for simultaneously controlling operations of at least two system motors by pulse-width modulation. The motor controller includes a pair of switches, a pair of pulse signal...
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7095204 |
Startup control method of brushless DC motor
A startup control method of a BLDC motor is disclosed. The method can control the BLDC motor to prevent the generation of a transient current such that the vibration of the BLDC motor can be...
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7081735 |
System and method for bypassing a motor drive
A motor control system comprising a plurality of motor controllers and a power source adapted to drive an electric motor. The motor control system comprises a switch that is selectively operable...
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7023165 |
Stepping motor control apparatus
A stepping motor control apparatus in accordance with the present invention comprises: a current detection unit that detects phase currents flowing into a stepping motor; an equivalent...
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6967461 |
North-south pole determination for carrier injection sensorless position sensing systems
A system for enhancing the performance of a carrier insertion sensorless (CIS) position sensing system for a wound field synchronous machine that utilises the positively rotating components (+2ω c...
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6922028 |
Controller for permanent magnet motor
Disclosed is a control device of a permanent magnet electric motor which makes it possible to synchronously control the permanent magnet electric motor even when the magnetic pole logarithm of the...
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6914398 |
Rotary machine control
The present invention discloses devices and methods for improved starting and stopping of rotary motors. A rotary electrical machine ( 3 ) is supplied with a voltage from a voltage supply ( 10 )....
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6850054 |
Device and a method for non-contacting sensing of the rotational state of a rotor
A device and a method for non-contacting sensing of the rotational state of a rotor ( 10 ). The rotor has a surface divided into an electrically conductive part ( 1 e ) and a nonconductive part ( 1...
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6815916 |
Speed-control drive circuit for a D.C. brushless fan motor
A speed-control drive circuit for a D.C. brushless fan motor includes a pulse width modulation input end for receiving an external pulse width modulation signal for controlling (and changing) the...
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6774592 |
Method and system for controlling a permanent magnet machine
Method and system for controlling a permanent magnet machine are provided. The method provides a sensor assembly for sensing rotor sector position relative to a plurality of angular sectors. The...
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6717383 |
Fountain control for generating dynamically changing flow patterns
A programmable fountain controller for varying the flow rate of an AC PMSM fountain pump in a pre-determined manner so as to generate dynamically changing flow patterns. A micro-controller is...
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6710571 |
Household electrical appliance operable at more than one A.C. frequency
A household electrical appliance for a.c. operation includes a synchronous motor, a dropping resistor, and a device for inserting the dropping resistor. The synchronous motor is rated at a first...
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6667598 |
Circuit for generating three-phase PWM signal
There is provided a control circuit including (a) a first circuit for generating a three-phase PWM (pulse width modulation) signal, the circuit having functions of generating a PWM signal necessary...
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6650081 |
Synchronous motor driving system
Axial error calculation unit is provided for estimating an axial error Δθ between a d-q axis and a dc-qc axis by using Ld, Lq, Ke, Id*, Iq*, Idc and Iqc in a range of all rotational speeds except...
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6605912 |
Method for controlling a permanent magnet motor
A three region control strategy for a permanent magnet motor is presented. In a first control region, the permanent magnet motor is operated at, a 120° conduction square wave mode at reduced phase...
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6586904 |
Compensation for variable voltage
A switched reluctance drive is supplied from a voltage source which varies from the voltage at which the control laws for the drive were determined. The control system compensates for this by...
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6501244 |
Method and apparatus for controlling a high-speed AC permanent magnet synchronous motor coupled to an industrial turbo engine
A method and apparatus for controlling a permanent magnet synchronous motor ( 8 ) coupled to a turbo engine such that transient current and steady state current are minimized. The method comprises...
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6486633 |
Method for monitoring the speed of a synchronous motor, and a device for monitoring the speed of such a motor
A method for monitoring the speed of a synchronous motor, the synchronous motor having a permanent magnet rotor ( 3 ) and coils ( 1, 2 ), sinusoidal currents being applied to the coils ( 1, 2 )....
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6473562 |
Method for low-speed operation of brushless DC motors
A method to operate an electronically commutated DC motor driving a centrifugal pump and comprising a stator fitted with at least one winding and a rotor fitted with permanent magnets, said method...
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6462492 |
Position-sensorless controlling method of synchronous motor
There is provided a control method capable of stably rotating a synchronous motor synchronously with an output frequency even when a phase error between a real rotary axis and a control rotary axis...
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6396229 |
Method of estimating a rotor position of synchronous motor, method of controlling synchronous motor with no position sensor and a controller of synchronous motor
In a method of accurately estimating the rotor position of a synchronous motor having saliency from observable quantities, a control system for adjusting an output frequency of an inverter on the...
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6384565 |
Method and apparatus for deriving characteristics of a utility signal in an AC machine drive system
A method and apparatus for deriving characteristics of a utility signal for synchronizing the output of a motor drive with the utility for a transfer or capture operation. With the drive in idle,...
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6337554 |
Device for controlling an electric motor
The present invention concerns a device ( 20 ) for controlling an electric motor ( 1 ) including a rotor ( 6 ) and at least three stator coils ( 2, 3, 4 ) connected between three connection...
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6326760 |
Method and device for controlling a synchronous motor with permanent magnet
A method and device for controlling a synchronous permanent magnet motor with at least one phase, a coil and a rotor, wherein the method and device controls the powering of each motor phase,...
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6225774 |
Motor control method and motor control system
In an a.c. motor control method and apparatus, operations are carried out at a current controller and a voltage setting using interrupt signals generated in synchronism with maximum and minimum...
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6204617 |
Device for the detection of an angle of rotation of a brushless multi-phase d.c. motor
A device which detects the angle of rotation of a rotor with respect to a stator of a brushless multi-phase d.c. motor. The rotor comprises a permanent magnet and the stator comprises a plurality...
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6201367 |
Method for restarting a synchronous permanent magnet motor still rotating
A method for restarting a three-phase synchronous permanent magnet motor in which the rotor is still rotating and in which the motor is connected to a drive unit having a DC-stage with voltage...
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6184647 |
Method of estimating initial pole position of permanent magnet brushless motor
In order to estimate a magnetic pole position of a permanent magnet type brushless motor, the following steps are conducted. A given γ axis and a given δ axis in an advanced from the γ axis by...
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6181093 |
Commutation circuit for a sensorless three-phase brushless direct curent motor
A commutation circuit for a sensorless three-phase BLDC motor enables soft switching in the commutation process without the need for a complex delay circuit and generates signals separate from the...
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6064173 |
Application-specific electronic motor starter
A motor control system or electronic motor starter is optimized to replace electromechanical motor starters. Heat dissipation requirements are reduced by utilizing a by-pass contactor when the...
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6023137 |
Use of traction inverter for supplying power for non-traction applications
A method and apparatus for cranking of an internal combustion engine in an AC electric traction motor propelled vehicle using inverters normally coupled to supply power to each of a plurality of AC...
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5936376 |
Excitation circuit for balancing phase voltages in a two phase motor
An excitation circuit is disclosed for balancing the phase voltages in a two phase motor. The excitation circuit includes a first and second switch and a port for receiving a signal to drive the...
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5929591 |
Air conditioner
For achieving an air conditioner being applicable to various a-c source voltages in common and operative with high power factor by suppressing generation of high harmonics, an a-c source voltage...
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