Abstract
The speed sensorless control of nonsalient PMSM that uses estimated rotor flux instead of the transformation angle is designed. This paper introduces a new sequential switching control strategy for a current control of a three phase inverter. The key idea is to integrate the benefits of the variable structure system control design and the event-driven sequential control structures to raise the system performance and control efficiency. The design is applied to the control of three phase permanent magnet synchronous machine. The operation at low speed is improved by reducing the disturbance impact. The estimation angle error at zero speed is limited by injecting the DC current that compensates the unknown load torque and enables operation at zero speed. The VSS speed sensorless control of PMSM is implemented on a DSP/FPGA system, and verified experimentally.
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