Simulation of a brushless DC motor

Abstract EN

Conventional dc motors are highly efficient and their characteristics make them suitable for use as servomotors.

However, their only drawback is that they need a commutator and brushes which are subjected to wear and require maintenance.

When the functions of commutator and brushes were implemented by solid-state switches, maintenance-free motors were realized.

These motors are now known as brushless dc motors (BLDCM).

The motor has the characteristics of a dc motor driven from ac mains.

BLDCM utilizes semiconductor devices and rotor position sensors replacing the mechanical commutator and brushes.

It becomes popular because of long life, simple control and excellent dynamic behavior.

Moreover, the absence of sparking makes it suitable for hazardous environments.

In this paper, the concept of BLDCM is discussed, the dynamic mathematical model is presented, and the dynamic and steady state performance of the motor is simulated and presented.