Influence of Electromagnetic Effects on the Dynamics Characteristics of Electric Propulsion System

doi:10.3969/j.issn.1674-0696.2026.03.15

Abstract

Abstract: Regarding the electromechanical coupling vibration phenomenon in the electric propulsion system (EPS) of electric helicopters, an electromechanical coupling dynamic model of EPS was established, which took into account the electromagnetic torque characteristics of the permanent magnet synchronous motor, the dead zone effect and tube pressure drop characteristics of the inverter, and the time-varying mesh stiffness characteristics of the gears. By comparing the inherent characteristics and dynamic response results of EPS with and without considering the electromagnetic effects of the motor, the rule of electromagnetic effects affecting the dynamic characteristics of EPS was revealed. The research shows that the electromagnetic stiffness of the motor has a significant impact on the low-order modes of EPS, while having a relatively small impact on the high-order modes. The electromagnetic effects have a significant impact on the transient response of EPS but have a relatively small impact on the steady-state response value. The influence of electromagnetic effects on the steady-state response of EPS is mainly observed in the frequency domain characteristics, while the difference of peak values in the time domain is relatively small. When the gear pair decreases in the moment of inertia or is directly connected to the motor, the influence of electromagnetic effects on its dynamic meshing force will increase. This study can provide reference for the selection of modeling methods for EPS under different analysis purposes such as fault diagnosis, strength verification, and dynamics optimization.

Key words: mechanotronics engineering; electric propulsion system; electromagnetic effect; inherent characteristics; dynamic meshing force

摘要： 针对电动直升机电推进系统（electric propulsion system, EPS）机电耦合振动现象，建立了考虑永磁同步电机电磁转矩特性、逆变器死区效应和管压降特性、齿轮时变啮合刚度特性的EPS机电耦合动力学模型。通过对比是否考虑电机电磁效应的EPS的固有特性及动态响应结果，揭示了电磁效应对EPS动力学特性的影响规律。研究表明：电机的电磁刚度对EPS低阶模态影响较大，而对高阶模态影响较小；电磁效应对EPS瞬态响应影响较大，对稳态响应值影响较小；电磁效应对EPS稳态响应的影响主要见于频域特征，而时域峰值差异较小；当齿轮副的转动惯量减小或与电机直接相连时，电磁效应对其动态啮合力的影响程度增大。研究可为EPS在故障诊断、强度校核、动力学优化等不同分析目的下的建模方法选择提供参考借鉴。

关键词: 机电工程；电推进系统；电磁效应；固有特性；动态啮合力

CLC Number:

O319.56

JIA Hanjie1,2, HU Guanghong1, XU Xiangyang1, LIANG Dong1. Influence of Electromagnetic Effects on the Dynamics Characteristics of Electric Propulsion System[J]. Journal of Chongqing Jiaotong University(Natural Science), 2026, 45(3): 128-134.

贾涵杰1,2，胡光鸿1，徐向阳1，梁栋1. 电磁效应对电推进系统动力学特性的影响研究[J]. 重庆交通大学学报（自然科学版）, 2026, 45(3): 128-134.

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