Modulation Strategy of Dual Three-phase PMSMs

This book mainly conducts analysis and research on the concentrated vibration excited by high-frequency harmonics of the existing DTP-PMSM under the narrow spread spectrum range. Firstly a mathematical model of the dual-three-phase PMSM is established and the maximum four-vector SVPWM algorithm is introduced. On this basis aiming at the shortcomings of the traditional variable delay SVPWM method a multiple random SVPWM technology is proposed. Then a dual-centralized SVPWM algorithm is put forward which eliminates the PWM harmonics at odd multiple carrier frequencies. For the asymmetric PWM waveform a dual-centralized SVPWM based on triangular carrier is proposed which reduces the implementation difficulty. Furthermore combined with the variable delay method the influence of the variable carrier frequency method on the low-frequency band is reduced. Finally simulation and experimental studies are carried out from the aspects of high-frequency harmonic analysis vibration acceleration test spectrum spread factor and low-frequency performance analysis to verify the effectiveness of the proposed control strategy.