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Sensorless BLDC control with BEMF

Posted: 06 Mar 2009     Print Version  Bookmark and Share

Keywords:BLDC  dsPIC Digital Signal Controller  back-electromotive force 

This application note by Microchip describes a sensorless brushless direct current (BLDC) motor control algorithm that is implemented using dsPIC Digital Signal Controller (DSC). The algorithm works utilising a majority function for digitally filtering the back-electromotive force (BEMF). Each phase of the motor is filtered to determine when to commutate the motor drive voltages. This control technique excludes the need for discrete, low-pass filtering hardware and off-chip comparators. It should be pointed out that all the discussions here, and the application software, assume a three-phase motor has to be used.

The purpose of this application note is to explain the different parts of the implementation of this sensorless BLDC motor control technique in a basic and simple form. It also shows that this new control method is a single-chip dsPIC DSC device-based solution, which does not requires external hardware except for a couple of resistors used to conditioning the BEMF signals to the dsPIC DSC device ADC operational voltage range.

View the PDF document for more information.

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