AASeminar on Seminar on

Brushless DC MotorsBrushless DC Motors

Basic StructureBasic Structure

Principle of brushless DC motorPrinciple of brushless DC motor

Comparison of conventional and Comparison of conventional and brushless dc motorsbrushless dc motors

Drive circuitsDrive circuits

Unipolar driveUnipolar drive

Bipolar driveBipolar drive

Unipolar driveUnipolar drive

Bipolar driveBipolar drive

ApplicationsApplicationsLaser printer

Hard disk drive

Comparison of an ac synchronous motor and a brushless dc motor for an 8-inch hard disk drive

Efficiency Comparison brush DC to Brushless DC

ADVANTAGESADVANTAGES

It is more efficient.It is more efficient. Need less maintenance.Need less maintenance. It can operate higher speeds than conventional dc It can operate higher speeds than conventional dc

motor.motor. High efficiency & small size are especially High efficiency & small size are especially

important for military, aircraft, & automotive important for military, aircraft, & automotive application.application.

Speed accuracy is very high.Speed accuracy is very high. Speed control over a very wide speed range.Speed control over a very wide speed range.