Challenges of Sensorless Controlled High-speed PMSM Drives

An integral part of every control design is synthesis and analysis of controlled loop. Major elements of each control loop are controlled system, wide variety of controllers, filters, or gains, which are easy to be identified. Minor elements, very often neglected, are offsets, delays or lags in signal processing, calculation, actuating and so on. This paper deals with an application use-case where timing and delays play a significant role and have an impact to the motor control performance. A compensation method was proposed to suppress a calculation delay caused by high speed operation of the PMSM in sensorless mode. The method was verified experimentally on high-speed drive, where the positive impact of compensation is shown.