Research on High-Performance Instantaneous Torque Control of Brushless DC Motor Based on Harmonic Decomposition

A high-performance instantaneous torque control method of brushless DC motors(BLDCM) base on harmonic decomposition is proposed. Only by injecting the fundamental current and the 5th and 7th harmonic currents can achieve high-performance instantaneous torque control such as minimal copper loss or no d-axis armature reaction. What's more, by given the different proportions of the 5th and 7th harmonic currents, it is possible to comprehensively consider many operating performances for joint control. Finally, the proposed method is validated by Matlab simulation and DSP experiment.