Dr. Ahmed G. Abo-Khalil

Electrical Engineering Department

Brushless DC elect

Brushless DC motors (BLDC motors, BL motors) also known as electronically commutated motors (ECMs, EC motors) are synchronous motors which are powered by a DC electric source via an integrated inverter, which produces an AC electric signal to drive the motor; additional sensors and electronics control the inverter output.

The motor part of a brushless DC motor is often permanent magnet synchronous motor, but can also be a switched reluctance motor, or induction motor.

BLDC motors may be described as stepper motors, however, the term stepper motor tends to be used for motors that are designed specifically to be operated in a mode where they are frequently stopped with the rotor in a defined angular position; this page describes more general BLDC motor principles, though there is overlap.

Two key performance parameters of brushless DC motors are the Motor constants Kv and Km.

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