混合励磁轴向磁场磁通切换永磁电机多矢量模型预测电流控制

Multiple Vector Model Predictive Current Control of Hybrid Excited Axial Field Flux-switching Permanent Magnet Motor

混合励磁轴向磁场磁通切换永磁(hybridexcitation axial field flux-switching permanent magnet,HEAFFSPM)电机是一种具有高效率、高功率密度、宽调速的新型永磁同步电机。该文针对该类混合励磁轴向磁场永磁电机的电励磁磁场与电枢磁场矢量耦合、参数非线性等问题,提出一种多矢量模型预测电流控制策略。详细分析电励磁磁场与电枢磁场耦合机理,构建HEAFFSPM电机离散数学模型。在此基础上,基于三矢量电流模型预测方法,提出电枢电压矢量与励磁电压矢量合成方法。在每个采样周期内,将多个基本电压矢量合成为两个幅值和方向均可调的虚拟电压矢量,实现对交、直轴电流与励磁电流的无差拍控制,有效缓解了电枢与励磁独立控制下磁场耦合导致的驱动系统运行性能恶化、电流畸变等问题,提高了HEAFFSPM电机控制系统的控制精度和响应速度。最后,通过实验验证所提出的多矢量模型预测电流控制策略的有效性。

The hybrid excited axial field flux-switching permanent magnet(HEAFFSPM)motor is a new type of permanent magnet synchronous motor with high efficiency,high power density,and wide speed regulation.In this paper,a multi-vector model predictive current control strategy is proposed to solve the problems of the vector coupling between the excitation field and armature field and the parameter nonlinearity character of this kind of motor.The field coupling mechanism of excitation field and armature field is analyzed in detail,and the discrete mathematical model of the HEAFFSPM motor is constructed.Based on the three-vector current model prediction method,the synthesis theory of armature voltage vector and excitation voltage vector is proposed.In each sampling period,to realize the deadbeat control of d-q axis current and excitation current,the multiple basic voltage vectors are combined into two virtual voltage vectors with adjustable amplitude and direction.In this way,the field coupling effects in the independent control of the armature winding and the excitation winding,such as the deterioration of the dynamic characteristics of the drive system,current distortion and other problems,are effectively alleviated.Meanwhile,the control accuracy and response speed of the HEAFFSPM motor control system are improved.Finally,the effectiveness of the proposed multi-vector model predictive current control strategy is verified by experiments.