Brushless DC (BLDC) motors have the performance advantages of DC permanent magnet motors without the need for motor brush maintenance. BLDC motors have the additional advantages of very high base speed (20,000 RPM and higher), quiet operation and energy efficiency. In years past these advantages came with an initial investment premium. Today that premium over traditional DCPM motors has been reduced to the point where BLDC motors and drives may be seriously considered.
The following is provided to help designers and users have a better understanding of the practical aspects of implementing BLDC motors and drives in their variable speed applications.