Brushless DC Electric Motor
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/switching power supply, which produces an AC electric signal to drive the motor (AC with a caveat – alternating current often implies a sinusoidal waveform; a better term would be bi-directional current with no restriction on waveform); additional sensors and electronics control the inverter output amplitude and waveform( and therefor percent of DC bus usage/efficiency) and frequency ( ie rotor speed ).
The motor part of a brushless motor is often a permanent magnet synchronous motor, but can also be a switched reluctance motor, or induction motor.
Brushless 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 brushless motor principles, though there is overlap.
Two key performance parameters of brushless DC motors are the Motor constants Kv and Km ( which are numerically equal in SI units)
Read more about Brushless DC Electric Motor: Brushless Vs. Brushed Motors, Controller Implementations, Variations in Construction, Motor Control Power Supplies, Applications
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