双余度高压无刷直流电机有限元分析

Finite Element Analysis of Novel Dual-Redundancy High Voltage BLDCM

针对多电飞机的快速发展,设计了基于270 V的双余度高压无刷直流电机。根据双余度高压无刷直流电机的结构特点,建立了双余度高压无刷直流电机的数学模型,推导了双余度工作时的转矩计算公式。建立了双余度高压无刷直流电机的电磁场模型,并利用magnet对其进行了电磁场仿真,对比分析了单绕组工作时与双余度工作时的反电势、转矩、转速等。并建立了双余度高压无刷直流电机的磁热耦合分析模型,对其双余度工作时的热场进行了仿真。仿真结果表明:双余度高压无刷直流电机在运行过程中,可以达到与单绕组工作时相同的动态特性,转矩为单绕组工作时的2倍,且大大提高了系统的可靠性。

Aim. To our knowledge, there is no paper in the open literature dealing with dual-redundancy high voltage BLDCM （ BrushLess DC Motor） using 270 V. Section 1 of the full paper establishes the mathematical model of BLDCM＇ s driving system, whose schematic is presented in Fig. 1 ; in section 1, eq. （9） is the formula for calculating the torque of the BLDCM when it works in the dual-redundancy mode. Section 2 establishes the electromagnetic field model of the BLDCM as shown in Fig. 2, simulates its electromagnetic field and compares the counter electro-motive force, torque and rotational speed for the single-winding mode respectively with those for the dual-redundancy mode： Figs. 5 and 6 for counter electro-motive force; Figs. 7 and 8 for torque; Figs. 9 and 10 for rotational speed. Section 3 establishes the magnetic-thermal coupling model of a dual-redundancy high voltage BLDCM; Fig. 12 presents the simulation results for this model, showing that high voltage does not bring appreciable increase in temperature. The simulation results show preliminarily that the dual-redundancy high-voltage BLDCM can achieve the same dynamic characteristics as single winding motor but the torque is twice.