METHOD TO IDENTIFY ROTOR SLOT HARMONICS IN A MOTOR CURRENT SPECTRUM

System and Method for Controlling Hybrid and Grid Power in an Electric Fracturing Spread

Medium Voltage Variable Speed Assembly

System and method for controlling hybrid and grid power in an electric fracturing spread

Hydraulic Fracturing Equipment With Non-Hydraulic Power

VARIABLE FREQUENCY DRIVE SYNCHRONOUS RELUCTANCE MOTOR SYSTEM WITH VOLTS-PER-HERTZ CONTROL

Hydraulic Fracturing Equipment With Non-Hydraulic Power

METHOD FOR DETERMINING AT LEAST ONE PROPERTY OF A ROTATIONAL MOVEMENT OF A THREE-PHASE ROTARY CURRENT MACHINE IN GENERATOR OPERATION AND ELECTROMECHANICAL DRIVE

Method for selecting a frequency converter for a refrigerant compressor unit

Controller and drive circuits for electric motors

Fault tolerance decision-making method and system for sensor failure of vehicular wheel hub driving system

AIR CONDITIONER AND METHOD FOR DETERMINING ENERGY CONSUMPTION OF AIR CONDITIONER

Method and system for constant temperature control of motorized spindles

Method for determining the error voltage of a current converter and three-phase machine having error voltage compensation

Controller and drive circuits for electric motors

Motor control device and motor control method

MOTOR CONTROL METHOD AND CIRCUIT FOR VEHICLE, MOTOR DRIVE SYSTEM, AND VEHICLE

Synchronous motor drive system and synchronous motor drive method

Method and apparatus for low DC bus voltage ride through

Variable frequency independent speed motor control based on flux estimate

Method and system for constant temperature control of motorized spindles

Synchronous motor drive system and synchronous motor drive method

Method for selecting a frequency converter for a refrigerant compressor unit

Adjustable frequency drive systems and methods of employing power compensation

Current-sourced motor drive control for AC motors

HYDRAULIC FRACTURING EQUIPMENT WITH NON-HYDRAULIC POWER

Thyristor starter

Brushless DC Motor Control System and Method of Configuring the Same

METHOD AND APPARATUS FOR SOFT STARTING AND STOPPING A MOTOR

Device and method for driving a vacuum pump

Controller for a cooling unit compressor, system and use

Power supply assembly and associated method

Frequency converter, bypass frequency conversion control system and switching control method thereof

Power-loss ridethrough system and method

GENERALIZED FREQUENCY CONVERSION SYSTEM FOR STEAM TURBINE GENERATOR UNIT

Method for selecting a frequency converter for a refrigerant compressor unit

Vacuum Pump Drive Having Two Frequency Converters

Multi-pulse constant voltage transformer for a variable speed drive in chiller applications

Pump assembly and controlling method

Variable speed maximum power point tracking, solar electric motor controller for induction and permanent magnet AC motors

Inverter control apparatus

Electric submersible pump variable speed drive controller

System having electrical machine and controller

Auto-synchronization of brushless DC motors

Control device for power conversion device, compressor drive system, flywheel power generating system, and control method of power conversion device

Induction motor control

Systems and methods of optimizing operation efficiency of a motor drive

INVERTER CONTROL DEVICE AND MOTOR DRIVE SYSTEM

Acceleration method for V/F controlled induction motor in flux-weakening region

Motor controller and method for controlling motor

Inverter

Feedforward control of motor drives with output sinewave filter

Power supply assembly and associated method

Power supply of an electric motor

Inverter for supplying load-adaptive boost voltage

Multi-pulse constant voltage transformer for a variable speed drive in chiller applications

Drive unit and transport machine

V/F control method for suppressing current oscillation of induction motor

Apparatus for controlling inverter

Apparatus and method for restarting medium voltage inverter

Methods of generating output variable voltage for electric drive devices and systems thereof

Controller for use with a reciprocating electric submersible pump

Variable frequency speed control system and method of the same

Quasi vector motor controller

Refrigerant compressor drives offering enhanced robustness, efficiency and rated voltage operability

System for operating a three-phase variable frequency drive from an unbalanced three-phase or single-phase AC source

System and method for controlling regenerating energy in an adjustable speed drive

Multi-speed electric motor

Apparatus for controlling induction motor

Method and arrangement for operating a pump

Method and apparatus for stability control of open loop motor drive operation

Inverter apparatus

Vector control device for an electric motor that controls an electric power converter that converts DC power to AC power, electric motor, vehicle drive system, and vector control method for electric motor

Control device and control method for electric motor, and motor and vehicle driving system to which the control device and control method are applied

Over temperature protection device for electric motors

Drive control device, electrical apparatus and drive control method

System and method of speed detection in an AC induction machine

Method and apparatus for control of a synchronous permanent magnet motor, particularly over a long cable in a well

Current switch with automatic calibration

System and method of dynamic regulation of real power to a load

Variable frequency drive and rotation speed searching apparatus for an induction motor

Inverter for electric vehicle

System and method of speed detection in an AC induction machine

Dead-time compensation apparatus of PWM inverter and method thereof

Variable speed drive system

AIR CONDITIONING SYSTEMS WITH OVERSPED INDUCTION MOTORS

System and method of dynamic regulation of real power to a load

System and method of dynamic regulation of real power to a load

Method and arrangement for monitoring the safety of a transport system

System, method and program product for cable loss compensation in an electrical submersible pump system

Apparatus for controlling inverter

Method and apparatus for stabilizing voltage of intermediate circuit of frequency converter

Motor controller

System and method of controlling the start-up of an adjustable speed motor drive based sinusoidal output power conditioner

Electric driven tool device

Control unit for controlling a synchronous motor

Frequency converter for different mains voltages

Control module for flywheel operated hand tool

Controller and drive circuits for electric motors

Negative-slope voltage-frequency for starting a variable frequency independent speed motor and speed control

Inverter supplying power to induction motor for driving hoist

Electric submersible pump variable speed drive controller