定子无铁心永磁无刷直流电机(ironless-stator permanent magnet brushless DC motor，IPMBLDCM)的换相误差问题会导致电机性能下降。已有 BLDCM 驱动主要使用单级全桥或后级全桥的双级拓扑，并在此基础上分析换相误差引起的电路状态变化。同时，已有换相误差校正控制器主要使用PI控制器，但是PI控制器在处理非线性时变系统时性能下降。针对Buck级联三相半桥双级式拓扑驱动的换相误差问题，详细分析了在电动状态和能耗制动状态，换相时刻前、后电机端电压在多种换相误差情况下的变化，并给出能够在四象限运行状态使用的换相误差表征方法。在此基础上，设计基于无模型自适应控制方法的控制器，并针对研究对象设计换相误差的一步估计方法，加快控制器收敛速度，实现对换相误差的快速识别和校正。最后，在基于数字平台的电机控制系统上对所提理论和设计的控制器进行实验验证。
Commutation Error Identification and Correction of the Ironless-stator Permanent Magnet Brushless DC Motor Based on Terminal Voltage
The commutation error of the ironless-stator permanent magnet brushless DC motor(IPMBLDCM)can degrade motor performance.The present BLDCM drivers mostly employ a single-stage full-bridge inverter or a two-stage topology with a full-bridge rear stage,and the circuit state under various commutation error scenarios is investigated on this basis.Meanwhile,present commutation error correction approaches mostly employ PI controllers,but their effectiveness declines when dealing with nonlinear time-varying systems.To address the commutation error problem in a two-stage topology drive consisting of a Buck converter cascaded with a three-phase half-bridge,the motor terminal voltage before and after the commutation moment in electric and dynamic braking states is analyzed in detail in various commutation error cases,and a method of commutation error characterization that can be used in four-quadrant operation state is provided.On this basis,a controller based on the model-free adaptive control method is designed,as well as a one-step estimation method for commutation error using the model studied in this paper,which accelerates the controller's convergence speed and allows for the rapid identification and correction of the commutation error.Finally,the proposed theory and controller are tested experimentally using a digitally based motor control system.
ironless-stator motortwo-stage drivecommutation errormodel-free adaptive control
万方数据
维普
