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AN885

Title:
Brushless DC (BLDC) Motor Fundamentals
Name:
AN885
Date:
03/14/2004
Author:
Padmaraja Yedamale
Description:
Brushless Direct Current (BLDC) motors are one of the motor types rapidly gaining popularity. BLDC motors are used in industries such as Appliances, Automotive, Aerospace, Consumer, Medical, Industrial Automation Equipment and Instrumentation. As the name implies, BLDC motors do not use brushes for commutation; instead, they are electronically commutated. BLDC motors have many advantages over brushed DC motors and induction motors. A few of these are: ? Better speed versus torque characteristics ? High dynamic response ? High efficiency ? Long operating life ? Noiseless operation ? Higher speed ranges In addition, the ratio of torque delivered to the size of the motor is higher, making it useful in applications where space and weight are critical factors. In this application note, we will discuss in detail the construction, working principle, characteristics and typical applications of BLDC motors. Refer to Appendix B: ?Glossary? for a glossary of terms commonly used when describing BLDC motors.
Keywords:
Motor Control, BLDC Motor, Brushless DC, Motor, Back EMF, Sensorless, Commutation
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