Sensorless control of permanent magnet synchronous machine

Abstract

Permanent magnet synchronous motors (PMSMs) are widely utilized in the aerospace sector, serving as actuators for flight surface control in aircraftand as driving units for satellite attitude control. These applications benefit significantly from the high dynamics and energy efficiency inherent to PMSM drives. This paper focuses on the development of sensorless control methods for PMSMs, which enhance reliability and reduce costs by eliminating mechanical speed and position sensors. Sensorless control techniques rely on estimating the motor's speed and rotational angle, which can be categorized into two primary approaches: high-frequency signal injection methods, effective at low speeds, and back electromotive force (back-EMF) estimation methods, which excel at higher speeds.