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. The porting takes minimaleffort because the instruction set is identical for all PICmicro 14-bit core devices.

A brushless motor is constructed with a per-manent magnet rotor and wire wound stator poles. Electrical energy is converted to mechanical energy by the magnetic attractive forces between the permanent magnet rotor and a rotating magnetic field induced in the wound stator poles.

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  Permanent, Magnet, Permanent magnets, Per manent magnet, Manent

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