Maximum Torque Per Ampere Control for IPMSM Drives Based on Virtual Signal Injection with Parameter Change Compensation

The motor parameters in the calculation of virtual signal injection control are nominal values constant, which will cause parameter errors by different operation of the motor, so it hard to achieve accurate MTPA control. In this paper, we scrutinize the impact of motor parameter alterations on the current angle under the application of the virtual signal injection method. An augmented algorithm for virtual signal injection, integrated with parameter estimation compensation, is introduced. This algorithm mitigates the current angle error instigated by motor parameter fluctuations, thereby enhancing the efficiency and precision of virtual signal injection.