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This application report presents a solution to control multiple permanent magnet synchronous motors (PMSM, BLDC, and so forth ) simultaneously using the TMS320F2803x microcontrollers. Although the motors included in the “Multi Axis +PFC Kit” are brushless dc (BLDC), the same experimental procedure can be applied to various permanent magnet motors. TMS320F2803x devices are part of the family of C2000 microcontrollers, which enables the cost-effective design of intelligent controllers for three phase motors by reducing the system components and increasing efficiency. With these devices, it is possible to realize far more precise digital vector control algorithms like the field orientated control (FOC). The algorithm’s implementation is discussed in this document. The FOC algorithm maintains efficiency in a wide range of speeds and takes into consideration torque changes with transient phases by processing a dynamic model of the motor. Among the solutions proposed are ways to eliminate the phase current sensors and use an observer for speed sensorless control.

This application report covers the following:

  • A theoretical background on field oriented motor control principle
  • Incremental build levels based on modular software blocks
  • Experimental results