Comparative Study of Sensor and Sensor Less Speed Control of Permanent Magnet Synchronous Machines

Permanent Magnet Synchronous Motors (PMSM) used in controllers demand precise and accurate estimation of shaft positions for high-level controlling actions. Shaft positions can be obtained by sensors or can be estimated without sensors. This study does a comparative study of obtaining the shaft position of PMSM with and without sensors. Sensor less control is based on closed-loop control system using Model Reference Adaptive System (MRAS). MATLAB/Simulink is used to implement the developed model and simulated to obtain the results. This paper highlights the significance of sensorless control of shaft position. Sensor less method eliminates the need of costly and clumsy sensors thereby making the system more compact and Economical.