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. Some bldc motor applications that run inthis RPM range are model RC motors, fans, harddrives, air pumps and dental algorithm described in this application note can beimplemented on two Microchip development boardplatforms: PICDEM MC LV Development Board dsPICDEM MC1 Development BoardThe PICDEM MC LV Development Board includes adsPIC30F3010 DSC.
© 2007 Microchip Technology Inc. DS01083A-page 1 AN1083 INTRODUCTION This application note describes a sensorless brushless DC (BLDC) motor control algorithm, implemented using
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