Transcription of AN1083, Sensorless BLDC Control with Back-EMF …
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AN1083, Sensorless BLDC Control with Back-EMF …
2007 Microchip Technology 1 AN1083 INTRODUCTIONThis application note describes a Sensorless brushlessDC (BLDC) motor Control algorithm, implemented usingthe dsPIC digital signal controller (DSC). The algorithmworks by digitally filtering the back-Electromotive Force( Back-EMF ) on each phase of the motor and determin-ing when to commutate the motor windings based on thefiltered Back-EMF signals. This Control techniqueprecludes the need for discrete, low-pass filteringhardware and off-chip motors are used in a variety of applications. Thealgorithm described in this application note targetsBLDC motors that operate in the 40k to 100k electricalRPM range.
AN1083 DS01083A-page 2 © 2007 Microchip Technology Inc. BLDC MOTOR CONSTRUCTION This algorithm has been tested on these motors: Ł 4-pole, 12V, 10A fan motor with a maximum
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