Application Note: Sensorless Field Oriented Control (FOC) of a Permanent Magnet Synchronous Motor (PMSM) Using a PLL Estimator and Formula-Based Field Weakening (FW) Techniques

Current industry trends show that permanent magnet synchronous motor (PMSM) is one of the preferred motors for motor control application designers. Compared with other motors in the same category, it has advantages such as high power density, fast dynamic response and high efficiency. Combined with its ability to reduce manufacturing costs and improve magnetic properties, permanent magnet synchronous motor is an ideal choice for large-scale product implementation.

This application note describes how to estimate the flux angle and speed of a permanent magnet synchronous motor (PMSM). It provides an in-depth look at the main theoretical concepts of the estimator, formula-based closed-loop field weakening, and adjustment direction.

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