Comparative Study of Sliding-Mode Observers-Based Sensorless Control of Permanent Magnet Synchronous Motor

To reduce the cost, size and weight of the motor system, sensorless control technology is widely used in motor control systems. In this paper, three observer-based proportional control strategies are introduced to control a permanent magnet synchronous motor system. On the basis of the rotor speed and position estimated by three observers including the conventional sliding-mode observer, the classical second-order sliding-mode observer and an improved second-order sliding-mode observer, the control performance and estimated performance are compared through theoretical analysis and simulation results under different operation conditions.