Brushless DC Motor and Its Uses

Brushless DC motors are also called electronically commutated motors, DC commutatorless motors, DC servomotors or AC synchronous motors. This is based on the way that they perform under direct current supply to produce mechanical energy. Since their efficiency, speed and life are all better than the brushed motor, they are getting accepted in many applications. Although their costs were too high because of their complex motor controller, the lowering of these costs has meant an increase in the usage of the brushless DC motor.

Stores like Teco Electric Co. Ltd. stock these motors which can be used in electronics, computers, industrial robots, actuators, medical industries, semiconductors and the automotive industry. Their construction consists of a rotor with permanent magnets and a stationary armature. They are smaller in size and lighter than a brushed motor. Their heat dissipation and power density are also better and greater than brushed motors.

The advantages of a brushless DC motor are:

No electrical or friction losses leads to a longer life

No brushes or mechanical commutators means the motor needs almost no maintenance.

The noise and EMI are considerably reduced because there are no ionizing spikes

They are totally sealed which makes them perfect for use in environments with oil, dirt, grease and other matter

They are characterised by high speed, high torque control even with heavy loads, short index and duty cycle moves and high accelerating and decelerating capability

Applications of brushless DC motors

These motors are used in actuation, servo, variable speed applications and positioning. Wherever the operation needs to be stable with accurate motion control, brushless motors are the best

They are usually used as:
Linear motors
Actuators for industrial robots
Extruder drive motors
Feed drives for CNC machine tools