Transcription of Sensorless BLDC Control AN1160B - Microchip …
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Sensorless BLDC Control AN1160B - Microchip …
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. The motorcontrol algorithm described here has four main parts: Sampling trapezoidal BEMF signals using the microcontroller s Analog-to-Digital Converter (ADC) PWM ON-side ADC sampling to reduce noise and solve low-inductance problems Comparing the trapezoidal BEMF signals to VBUS/2 to detect the zero-crossing points Filtering the signals coming from the comparisons using a majority function filter Commutat
2008-2012 Microchip Technology Inc. DS01160B-page 1 AN1160 INTRODUCTION This application note describes a sensorless Brushless Direct Current (BLDC) motor control …
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