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9007014 System and method for compensating for high frequency application of ripple correlation to minimize power losses in induction machines  
A method for minimizing power losses in an alternating current (AC) machine is provided. The method includes determining a first rotor flux signal based on signals of voltage and current inputs to...
8853991 Phase angle detection in an inverter  
A system and method of detecting phase angle in an inverter is provided. A shunt resistor is coupled to a controller which is part of an inverter circuit and a phase angle may be directly derived...
8810190 Motor controller system and method for maximizing energy savings  
A motor controller (4) and method for maximizing the energy savings in an AC induction motor (3) at every load wherein the motor is calibrated at two or more load points to establish a control...
8796966 Motor controller and related method  
The present invention relates to a motor controller and related method. The invention is particularly well suited for use with an alternating current (AC) induction motor. Previously motor...
8754606 Power supply circuit and motor device  
A power supply circuit has an input terminal for electrically connecting to an active wire of an AC power supply, an earth terminal for electrically connecting to a neutral or ground wire of the...
8710778 Control of an electric machine  
A method of controlling an electric machine that includes sequentially exciting and freewheeling a winding of the electric machine. The winding is excited by an excitation voltage and is...
8643319 Control of a brushless motor  
A method of controlling a brushless motor that includes rectifying an alternating voltage to provide a rectified voltage, and exciting a winding of the motor with the rectified voltage. The...
8633668 Single phase motor energy economizer for regulating the use of electricity  
A device for improving efficiency of an induction motor soft-starts the motor by applying a power to the motor that is substantially less than the rated power of the motor then gradually...
8575881 Current injection circuit for delaying the full operation of a power factor control circuit for AC induction motors  
An energy saver delay circuit for an induction motor is disclosed. The energy saver delay circuit includes a power factor control circuit including an integrator, the integrator having a negative...
8564240 Mitigation of harmonic currents and conservation of power in non-linear load systems  
An AC power controller system applies three-phase AC operating power to an induction motor that drives a non-linear mechanical load. A primary low pass filter is connected in series between branch...
8536822 Voltage-controlled stepper motor driver  
A stepper motor driver system includes: a digital signal controller configured to digitally synthesize synthesized analog voltage signals that will induce a desired velocity of a stepper motor...
8508166 Power factor correction with variable bus voltage  
A controller includes a voltage determination module, a bus voltage command module, and a power factor correction (PFC) control module. The voltage determination module determines a desired direct...
8502492 Single phase motor energy economizer for regulating the use of electricity  
A device for improving efficiency of an induction motor soft-starts the motor by applying a power to the motor that is substantially less than the rated power of the motor then gradually...
8493013 Electric motor control algorithm with bypass relay  
Aspects of the present invention pertain to a method of power control for an electrical motor using a control bypass feature that allows for the delivery of full supply voltage to a motor when it...
8487572 Brushless three phase motor drive control based on a delta zero crossing error  
A control method for a brushless, three-phase DC motor. The motor may include a plurality of electromagnets and a rotor. A voltage induced by rotation of a rotor may be sampled at an expected zero...
8471511 Brushless motor control device and brushless motor  
A voltage application unit causes switching elements to apply voltage to flow an electric current into corresponding windings to generate a revolving magnetic field. A period derivation unit...
8446114 Control apparatus for electric rotating machine  
A control apparatus for use with an electric power conversion system which is equipped with a dc/ac converter connected to an electric rotating machine and a capacitor joined to input terminals of...
8421399 Energy saver delay circuit for AC induction motors  
A power control system for an A.C. induction motor is disclosed, comprising a voltage/current phase difference generator for determining a difference in phase between a voltage applied to the...
8421398 Power control for induction motors using variable frequency AC power  
An autonomous controller allows an AC induction motor to operate over a broad range of AC power supply frequencies by reducing the amount of current supplied to the motor at lower frequencies. The...
8400090 HVAC condenser assemblies having controllable input voltages  
Assemblies for HVAC systems and methods of operating HVAC systems are disclosed, including a method of operating an HVAC system having a condenser motor operatively coupled to a fan and a...
8395347 Induction motor control device and induction motor group control system  
In an induction motor group control system, magnetic energy recovery switches (3) are connected in series to an induction motor (2) directly driven by a commercial power supply, and a plurality of...
8390238 Softstarter for controlling an asynchronous three-phase motor  
A softstarter for starting and stopping an asynchronous motor having three phases, including two pairs of semiconductor devices of the type turning off at zero-crossing of the current...
8384333 Alternating voltage control apparatus  
The alternating voltage control apparatus which is inserted serially between an alternating-current power source and an inductive load and which controls adjustment of load voltage of the...
8378608 Systems, devices, and/or methods for managing drive power  
Certain exemplary embodiments can provide a system, machine, device, manufacture, circuit, and/or user interface adapted for, and/or a method and/or machine-readable medium comprising...
8362759 Method to predict phase current  
A phase current prediction method is disclosed. The phase current prediction method predicts current representative of a PWM period using a motor model which receives current measured through a...
8362735 Single phase motor energy economizer for regulating the use of electricity  
A device for improving efficiency of an induction motor that soft-starts the motor by applying a voltage to the motor that is substantially less than the rated voltage then gradually increasing...
8358098 System and method for power factor correction  
A first rectifier diode is electrically connected between a first input terminal where an alternating current (AC) power is received and a first output terminal where a direct current (DC) power...
8319465 Method for the automatic adjustment of a protective device having an excess-current release, particularly a low-voltage circuit breaker  
The method for the automatic adjustment of a protective device includes determining an integral of the square of a motor current over time on the basis of a time motor current profile of an...
8253366 Signal status diagnosing device for control actuator as driven object  
A device for diagnosing signal status of a driven object includes an insulation transformer, a signal generating device, a current measuring device, a feedback device, and a voltage measuring...
8228014 Multi-phase DC/DC boost converter  
A method and an apparatus are provided for balancing current for each of a plurality of similar phases of a DC/DC boost converter. The method includes the step of measuring a voltage drop of each...
8120299 Motor controller of air conditioner  
The present invention relates to a motor controller of an air conditioner, including an inverter including a plurality of switching elements and adapted to convert a DC voltage, input through...
8040090 Brushless motor controller and brushless motor  
A brushless motor controller that controls a brushless motor by determining an energizing timing of a three-phase stator coil based on the rotational position and speed of a rotor. The controller...
8035322 Methods and apparatuses for estimating transient slip  
A method of determining a slip estimate associated with an induction motor through analysis of voltage and current signals. A fundamental frequency is calculated from a representation (e.g.,...
7999497 Device for controlling polyphase rotating machine  
A device for controlling a polyphase rotating machine comprising a stator, a rotor, and sensors, the device being capable of receiving at least one first sensing signal (V, W, U) representing a...
7977898 Current sensing for a multi-phase DC/DC boost converter  
Methods and apparatus are provided for sensing currents on a plurality of phases and determining current information therefrom. The multi-phase boost converter includes a single sensor coupled to...
7957844 Device and a method for power balancing  
A method for stabilization of the power balance in an electric power system including a number of nodes. An instantaneous value of the mains frequency of the electric power system is sensed. In...
7923952 Device for controlling polyphase rotating machine  
A device for controlling a polyphase rotating machine, the machine comprising a stator, a rotor, and sensors, the device being capable of receiving: at least one first sensing signal (U; V; W)...
7911173 Open loop method for controlling power  
A method of power control for an electrical motor using open-loop principles is disclosed. The method employs a desired control line function that determines hold-off time based on a detected...
7902788 Mitigation of harmonic currents and conservation of power in non-linear load systems  
An AC power controller system applies three-phase AC operating power to an induction motor that drives a non-linear mechanical load. A primary low pass filter is connected in series between branch...
7898210 To obtain the three-phase current via adjusting width of pulses with single DC-link current sensor  
After an AC motor generates a three-phase current, modulate the three-phase current to generate an original voltage space vector, and add three detecting vectors with a sum of zero after the...
7855524 Voltage control and power factor correction in AC induction motors  
A voltage control circuit is disclosed. A power factor corrector may utilize the control circuit to provide power factor correction for an AC induction motor. An AC induction motor system may...
7852022 Control apparatus for electric car  
A control apparatus for an electric car, including a power converter which feeds AC power of variable voltage and variable frequency to a primary side member of a linear electromagnetic actuator,...
7834568 Method and device for driving a brushless motor with voltage waveform predisposed for a progressive and automatic switching from a three-phase sinusoidal driving to a square wave three-phase driving  
The method and a related device are for driving a brushless motor, according to which by acting solely on the control value, that is by reducing or increasing it, the driving mode eventually...
7812563 Motor starting and switching  
A method of starting and apparatus for starting a multiphase electrical machine is disclosed. The aim is to reduce oscillatory pulsation in torque generated by the motor and inrush current that...
7768221 Method, system, and apparatus for controlling an electric motor  
The present invention provides systems and methods for power factor control of a motor. A phase detector uses a line voltage of a power supply and a motor terminal voltage of a motor. The output...
7683568 Motor drive using flux adjustment to control power factor  
The switching rectifier and switching inverter on a motor drive unit are modulated to indirectly change the magnitude of current and voltage stored in DC link by controlling the magnetic field of...
7671557 Phase current detection method, inverter control method, motor control method and apparatus for carrying out these methods  
Apparatus and methods for phase current detection used for driving a motor by supplying outputs from a pulse width modulation (PWM) converter to the motor. One method presented provides detecting...
7638966 Voltage control and power factor correction in AC induction motors  
A voltage control circuit is disclosed. A power factor corrector may utilize the control circuit to provide power factor correction for an AC induction motor. An AC induction motor system may...
7637723 Cavitation detection device and method  
Cavitation detection systems and methods include generating a signal representing the power factor of a motor driving a pump, analyzing the power factor signal and determining the presence of...
7606011 Motor controller with automated input power determination  
A motor controller automatically determines a motor input power setting based upon manually entered motor output values. The motor controller includes an interface and an input power determining...

Matches 1 - 50 out of 237 1 2 3 4 5 >