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Description
Double-Stator-Single-Rotor (DSSR) surface mounted Permanent Magnet Synchronous Motor (PMSM) has the advantages of small size, light weight and high reliability. However, there are problems of large torque ripple and abundant back-EMF harmonic content. In order to improve the electromagnetic performance of the motor, a double-stator single-rotor field modulated motor (DSSR FMM) with high temperature superconductor (HTS) bulks is proposed in this paper. The motor is based on the operating principle of magnetic field modulation and uses a magnetic regulating ring with unequal width structure to adjust the internal and external air gap magnetic fields. In this model, the epoxy resin is replaced by superconducting materials, and the Meissner effect of superconducting materials is used to enhance the effect of magnetic flux regulation. Moreover, the auxiliary slot is opened in the outer stator of the motor model, which can not only reduce the cogging torque of the motor, but also improve the back EMF waveform. Finally, a motor model with an outer stator of 36 slots and 22 poles and an inner stator of 24 slots and 8 poles was established, and the electromagnetic properties of the motor such as air gap magnetic field, back EMF, torque and torque ripple were calculated. Compared with a DSSR PMSM, the results show that the back-EMF amplitude of the model is large and sinusoidal, the output torque is increased by 3.86%, and the torque ripple is reduced by 3.71%. It is proved that this topology can weaken the torque ripple and increase the electromagnetic torque of the double-stator single-rotor synchronous motor.
