Transcription of Sensorless BLDC Control AN1160B - Microchip Technology
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Sensorless BLDC Control AN1160B - Microchip Technology
2008-2012 Microchip Technology 1AN1160 INTRODUCTIONThis application note describes a Sensorless BrushlessDirect Current ( bldc ) motor Control algorithm that isimplemented using a dsPIC Digital Signal Controller(DSC) or a PIC24 microcontroller. The algorithm worksutilizing a majority function for digitally filtering theBack-Electromotive Force (BEMF). Each phase of themotor is filtered to determine when to commutate themotor drive voltages. This Control technique excludesthe need for discrete, low-pass filtering hardware andoff-chip comparators. It should be pointed out that allthe discussions here, and the application software,assume a 3-phase motor has to be used.
Nov 29, 2011 · proper control necessary, Pulse-Width Modulation (PWM) is used to achieve the right voltage level. PWM is an efficient method of driving the motor, but it intro-duces some noise issues when attempting to acquire the control feedback signals (i.e., BEMF voltages). To summarize, the important relationships for BLDC motors and sensorless control are:
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