【目的】轴向错角高速开关磁阻电机采用两套定转子错角结构,以改善传统开关磁阻电机因双凸极结构和非线性磁路导致的转矩脉动问题。为进一步降低电机转矩脉动,提高电机效率,本文提出了一种应用于错角结构开关磁阻电机的新型转矩分配函数策略。【方法】该策略针对稳态运行阶段,考虑到了两套定转子均处于单相导通和分别处于单相导通与两相交换导通的情况,前者按照转矩电流平方比分配两个导通相的转矩,后者用单相导通侧产生的转矩来补偿两相交换侧缺少的转矩,以实现对电机两侧各相绕组所分配转矩的最优配置。此外,设计了控制系统总体运行流程以保证系统可靠性。起动升速阶段采用电流斩波控制策略,限制电流峰值的同时确保快速跟踪给定转速;过渡阶段设计了转矩分配函数以实现起动阶段至稳态运行阶段的平滑切换。最后采用Simulink搭建电机控制系统仿真模型,验证本文所提控制策略的有效性。【结果】瞬态仿真结果表明,所提出的控制策略优化了转速调节时间与超调量,且起动升速阶段与稳态运行阶段过渡平稳,验证了所提控制策略的可靠性。稳态仿真结果表明低速与高速工况下采用改进转矩分配函数策略的转矩脉动系数与转矩电流比均优于四种传统转矩分配函数策略。【结论】本文所提出的控制策略具有可行性与稳定性,起到了降低电机转矩脉动与提高电机效率的作用,为改善高速开关磁阻电机控制性能提供了一种新思路。

[Objective] The axial stagger high-speed switched reluctance motor employs dual stator-rotor sets with a staggered angle to mitigate the high torque ripple inherent in conventional switched reluctance motors (SRMs) due to their double salient structure and nonlinear magnetic circuit. In order to further reduce the torque ripple and improve the efficiency of the motor, a new torque sharing function strategy for switched reluctance motor with stagger structure is proposed in this paper. [Methods] The strategy, aimed at the steady-state operation phase, takes into account the two sets of stator and rotor are in single-phase conduction and single-phase conduction and two-phase exchange conduction respectively. The former allocated the torque of the two conduction phases according to the torque per square ampere, while the latter used the torque generated at the single-phase conduction side to compensate for the lack of torque at the two-phase exchange side, in order to achieve optimal allocation of torque to each phase winding on both sides of the motor. What’s more, in order to ensure the reliability of the control system, the operation process of the control system was designed. The current chopping control strategy was adopted in the start-up phase to limit the current peak while ensuring the rapid tracking of the given speed. The torque sharing function in the transition phase was designed to realize the smooth switching from the start-up phase to the steady-state operation phase. Finally, a simulation model of the motor control system was built using Simulink to verify the effectiveness of the control strategy proposed in this paper. [Results] The transient simulation results indicated that the proposed control strategy optimized the speed regulation time and overshoot, ensuring a smooth transition between the start-up phase and the steady-state phase, thereby verifying the reliability of the proposed control strategy. The steady-state simulation results demonstrated that the torque ripple coefficient and torque current ratio of the improved torque sharing function strategy were superior to other four traditional torque sharing function strategies under both low-speed and high-speed conditions. [Conclusion] The control strategy proposed in this paper has the feasibility and stability, which can reduce the torque ripple and improve the efficiency of the motors, and provides a new idea for improving the control performance of high-speed switched reluctance motors.