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Field Oriented Control

 

 

The actual current vector is broken-down into real and imaginary components and compared to the desired current vector. The desired current vector will produces a flux vector that generates maximum torque.

Field oriented control is a motor commutation scheme which enables brushless motors to run faster and cooler. This is made possible by maintaining optimal orientation of the rotating magnetic field and permanent magnets at all speeds.

In a traditional control scheme, the commanded current is modulated by sinusoidal waveforms to create a rotating magnetic field in the motor stator. The frequency of the sinusoids is speed dependent. At higher speeds, current phase lag occurs causing misalignment of the magnetic fields. This causes motor heating and limits speed.

Products & Services
Electrical winding services fabricate custom-wound assemblies for a wide range of applications, including automotive, avionics, motor, transformer, medical instrumentation and power generation applications. Learn more about Electrical Winding Services
DC motors are most commonly used in variable speed and torque applications. They include brushless and gear motors, as well as servomotors. Search by Specification | Learn more about DC Motors
Gearmotors consist of an AC or DC motor with an integral gearbox or gear head that steps delivered speed up or down. Search by Specification | Learn more about Gearmotors
DC servomotors are generally small and powerful for their size, and easy to control. Common types of DC servomotors include brushless or gear motors. Search by Specification | Learn more about DC Servomotors
Linear motors generate force only in the direction of travel. They are capable of extremely high speeds, quick acceleration, and accurate positioning. Search by Specification | Learn more about Linear Motors
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Topics of Interest
The actual current vector is broken-down into real and imaginary components and compared to the desired current vector. The desired current vector will produces a flux vector that generates maximum... (Read More)
The actual current vector is broken-down into real and imaginary components and compared to the desired current vector. The desired current vector will produces a flux vector that generates maximum... (Read More)
AN1162 Sensorless Field Oriented Control (FOC) of an AC Induction Motor (ACIM) operate at a speed that is roughly proportional to the Author: Mihai Cheles input frequency. As you decrease the... (Read More)
Specialty Motors General Principles of Operation-Stepper A step or stepper motor is one in which electrical pulses are converted into mechanical movements. A standard DC motor, for example, rotates... (Read More)
Permanent Magnet (PM) Brushless Motors  The permanent magnet brushless dc motor has been in existence for about three decades and is finally being widely used for many applications1,5,6. Its... (Read More)
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