Abstract
In order to study the influence of harmonic torque on the performance of the integrated electric drive system (permanent magnet synchronous motor + reducer gear pair) in a pure electric vehicle (PEV), the electromechanical coupling dynamic model of a PEV was established by considering the dead-time effect and voltage drop effect of an inverter and the nonlinear characteristics of the transmission system. Based on the model, the dynamic characteristics of an integrated electric drive system (IEDS) are studied, and the interaction between the mechanical system and electrical system is analyzed. On this basis, a harmonic torque reduction strategy for an IEDS is proposed in this paper. The simulation results show that the proposed strategy can effectively reduce the harmonic torque of the motor and reduce the speed fluctuation and dynamic load of the system components, which can improve the stability of the IEDS and prolong the life of the mechanical components.
Highlights
In order to explore the influence of motor harmonic torque on the stability and dynamic load of an integrated electric drive system (IEDS), the electromechanical coupling dynamic model of a pure electric vehicle (PEV) equipped with an IEDS is established in this paper
The electromechanical coupling model of an electric vehicle equipped with an IEDS is established, and the electromechanical coupling characteristics of the IEDS are simulated and analyzed
The method to suppress the harmonic torque of a permanent magnet synchronous motor (PMSM) is studied
Summary
Electric drive assembly is the key component of a pure electric vehicle (PEV), which plays a key role in the driving experience. Recent studies have shown that the integration of a drive motor and reducer can greatly improve the efficiency, power density, and reliability of the drive system, and it can effectively reduce the volume, weight, and production cost of a PEV [1,2]. The research and development of high speed, high efficiency, high power density, lightweight integrated motor-reducer assembly has become a hotspot. The general structure of an integrated electric drive system (IEDS). Is shown, which mainly includes a permanent magnet synchronous motor (PMSM), motor control system, helical gear pair reducer, and output shaft. The IEDS includes the driving motor part and the mechanical transmission part
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