对于五相永磁电机最大转矩电流比(maximum torque per ampere，MTPA)控制系统，由于电机交叉耦合及饱和效应的存在，极大影响MTPA控制精度，无法满足其用于电动汽车领域的多工况运行需求。针对此问题，本文从电机驱动系统的角度，提出一种新的主动式MTPA策略。在电机设计阶段，提前考虑基于虚拟信号注入的MTPA(MTPA based on virtual signal injection，VS1-MTPA)控制精度，提出一种反凸极效应增强的五相磁场增强型内置式永磁容错(flux-intensifying fault-tolerant interior permanent magnet，FIFT-IPM)电机，以抑制交叉耦合及饱和效应对MTPA点追踪精度的影响;同时从控制算法的角度，针对五相FIFT-IPM电机的反凸极特性，提出相应的高精度VSI-MTPA控制策略，进一步提升五相FIFT-IPM电机MTPA控制驱动系统的动稳态性能。最后，搭建电机驱动系统实验平台，验证所提策略的可行性和有效性。
Active maximum torque per ampere strategy of a new five-phase flux-intensifying permanent magnet motor based on virtual signal injection
The control accuracy of the maximum torque per ampere(MTPA)control system of a five-phase permanent magnet motor is greatly affected by the cross-coupling and saturation effect of the motor;thus,it cannot meet multiple operating requirements for applications in electric vehicles.To overcome this,a new active MTPA strategy from the perspective of a motor drive system is proposed in this work.At the motor design stage,considering the control accuracy of MTPA based on virtual signal injection(VSI-MTPA),a five-phase flux-intensifying fault-tolerant interior permanent magnet(FIFT-IPM)motor with an enhanced negative saliency effect was proposed to suppress the influence of the cross-coupling and saturation effect on the tracking accuracy of the MTPA point.Moreover,for the negative saliency of the five-phase FIFT-IPM motor,a high-accuracy VSI-MTPA control strategy was proposed from the perspective of control algorithms to further improve the dynamic and steady-state performance of the motor drive system.Finally,the experimental platform of the FIFT-IPM motor drive system was built to verify the feasibility and effectiveness of the proposed strategy.
five-phase permanent magnet motormaximum torque per amperecross-coupling and saturation effectnegative saliencyvirtual signal injection
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