Fast dynamics response of sensorless control of high speed surface permanent magnet synchronous motor drives

Abstract

The present thesis is dedicated to the performant control of high variable speed permanent magnet synchronous motors. Thus, the thesis is focused on two solutions in order to control this machine for pumps, micro-turbine started generation units, centrifugal compressors, grinding machines, textile machines, drill, dental drills, aerospace technologies etc. In order to use permanent magnet synchronous machines in motor drives for heating, ventilating, and air conditioning appiications, simple, low cost control methods are also important. The particular requirement of the control of permanent magnet synchronous machines is the synchronization of the a.c. excitation frequency with rotational speed. Usually a shaft-mounted position sensor is required for achieving this. This position sensor increases the cost and reduces the reliability in the drive system. This makes it undesirable for these appiications. The objective of this research project is to investigate sensorless control methods of permanent magnet synchronous machines with particular attention for high speed appiications requirements. Since high dynamic performance is a demand for this kind of high speed appiications, a suitable control approach for permanent magnet machines is proposed. The new control is based on standard V/f control with two suppiementary stabilizing loops. This control becomes more reliability with evident advantages beside standard V/f control with superior stability and dynamic. Much more the power computation is inferior to vector control but with similar speed dynamics and steady state errors. Beside the new control, the vector control performance is also discussed in the thesis. The control structure and the design of the controllers for fieid orientation control drive system are described. Four angle and rotor position estimators for sensorless operation of the fieid oriented controlled drive system are studied in detail.