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Sensorless brushless DC motor control with PIC16

Posted: 19 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:brushless DC motor? motor control? BLDC?

There is a lot of interest in using brushless DC (BLDC) motors. Among the many advantages to a BLDC motor over a brushed DC motor, we can enumerate the following:

  • The absence of the mechanical commutator allows higher speeds

  • Brush performance limits the transient response in the DC motor

  • With the DC motor you have to add the voltage drop in the brushes among motor losses

  • Brush restrictions on reactance voltage of the armature constrains the length of core reducing the speed response and increasing the inertia for a specific torque

  • The source of heating in the BLDC motor is in the stator, while in the DC motor it is in the rotor, therefore it is easier to dissipate heat in the BLDC

  • Reduced audible and electromagnetic noise

    BLDC motor control consists of two parts. Part 1 is commutating the motor at the most efficient rate. Part 2 is regulating the speed of the motor within defined parameters. The purpose of this application note is to illustrate an elegant sensorless technique that can be implemented on low-cost MCUs. All demonstration software will operate within an open loop with no speed regulation.

    View the PDF document for more information.





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