Transcription of Brushless DC Motor Control Made Easy
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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. The final code can then beported to one of the smaller, less expensive, PICmicro microcontrollers.
and optimized for a Pittman N2311A011 brushless DC motor. Other motors were also tested to assure that the code was generally useful. Anatomy of a BLDC Figure 1 is a simplified illustration of BLDC motor con-struction. A brushless motor is constructed with a per-manent magnet rotor and wire wound stator poles.
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