Brushless DC Motor Control Made Easy

2002 Microchip Technology 1AN857 INTRODUCTIONThis application note discusses the steps of developingseveral controllers for Brushless motors. We cover sen-sored, sensorless, open loop, and closed loop is even a controller with independent voltage andspeed controls so you can discover your Motor s char-acteristics code in this application note was developed withthe Microchip PIC16F877 PICmicro Microcontroller, inconjuction with the In- circuit Debugger (ICD). Thiscombination was chosen because the ICD is inexpen-sive, and code can be debugged in the prototype hard-ware without need for an extra programmer oremulator. As the design develops, we program the tar-get device and exercise the code directly from theMPLAB environment.

actual practice, BLDC motors have more than one of the electrical circuits shown, wired in parallel to each other, and a corresponding multi-pole permanent mag-netic rotor. For two circuits there are two electrical rev-olutions per mechanical revolution, so for a two circuit motor, each electrical commutation phase would cover

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