Ting Dong

Analysis and inhibition of tooth tip leakage in the PMSM with the similar slot and pole number

The tooth tip leakage of permanent magnetic synchronous motor (PMSM) with the similar slot and pole number is relatively large, which not only reduces the output torque of the motor, but also causes the motor torque ripple. Therefore, it is necessary to analysis the its influence on the torque and restrain it. In this paper, combined with the characteristics of PMSM with the similar slot and pole number, a kind of stator iron core structure comprised with oriented silicon steel sheet is presented, which will decrease the tooth top leakage effectively, as a result of that, the torque ripple is reduced. In the end, the finite element soft is used to prove that the method is correct and effective.

Research on torque performance of six-phase PMSM with similar pole and slot number

According to the principle of magnetic energy virtual displacement and the characteristics of double Y shifted by 30° winding, the analytical expression of torque in six-phase permanent magnetic synchronous motor (PMSM) is derived, and the impact of harmonic magnetic field on torque is analyzed in this paper yet. On this basis, the torque performance of three-phase and six-phase PMSM with 96 slots 88 poles are simulated, and six-phase motor with the third harmonic current injection is simulated meanwhile. The simulation results show that the analytical expression is correct, and the six-phase double Y shifted by 30° winding PMSM with similar pole and slot number can eliminate the sixth ripple torque in the three-phase one, and the third harmonic current loaded in it can also produce average electromagnetic torque.

Model Reference Sliding Mode Control for RPMTM with Neural Network Load Torque Observer

Unpredictable plant parameter variations, external load disturbances and nonlinear dynamics which exist in ring permanent magnet torque motors (RPMTM) seriously deteriorate the drive performance of system at low speeds. A model reference sliding mode control scheme which features good robustness against parameter variations is proposed in this paper firstly. Then a neural network load torque observer is presented to observe and compensate external load disturbances. The analysis, design and simulation of the proposed model reference sliding mode control scheme controller and neural network load torque observer are described. Simulation results show that good control performance, both in the command-tracking and the load-regulating characteristics of the rotor position, is achieved.

Cogging Torque Reducing in Dual-Rotor Motor by Suitable Selection Inner and Outer Slot Opening Widths

In order to reduce the cogging torque in dual-rotor permanent magnet (PM) ring torque motor, the expression of cogging torque is deduced on the motor, and the influence rules of the resulting cogging torque are analyzed with change the inner and outer slot opening widths. According to the dual-rotor PM ring torque machine, the method for reducing the cogging torque amplitude and leading a reverse phase torque curve by suitable selection of the inner and outer slot opening widths is proposed. The results of simulation show that selecting the appropriate slot opening widths can effectively reduce cogging torque by the finite element simulation method.