With the advent of high-speed digital signal processors (DSPs) specialized for motion control applications, it has become possible to control motors without mechanical (speed or position)
sensors. This is achieved by algorithms that estimate the desired quantities in real time, based on the electrical signals in the motor windings. Benefits include cost savings and
improved reliability due to reduced component count. This application report presents a low-cost, sensorless drive system for a switched reluctance motor (SRM) based on the Texas
Instruments TMS320F243 DSP. Detailed descriptions of the hardware configuration, the sensorless commutation algorithm, its implementation details, and procedures for measuring
motor parameters should enable readers to rapidly duplicate and customize a sensorless SRM drive system to meet their specific application.
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