Integration design and parameter optimization for a novel in-wheel motor with dynamic vibration absorbers
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TECHNICAL PAPER
Integration design and parameter optimization for a novel in‑wheel motor with dynamic vibration absorbers Qiang Wang1 · Rui Li1 · Youfeng Zhu1 · Xianbin Du1 · Zongfeng Liu1 Received: 7 July 2019 / Accepted: 30 July 2020 / Published online: 10 August 2020 © The Brazilian Society of Mechanical Sciences and Engineering 2020
Abstract To overcome vertical vibration negative effects induced by high unsprung mass of the existing IWM, a novel integrated IWM topology scheme is developed. This scheme aims for the integrated design of hub, rotor housing and brake disk, and the stator is considered as a DVA, which is flexibly isolated from the unsprung system by the suspension elastic sleeve. Primarily, the quarter-vehicle dynamic model with the DVA-based electric wheel is established, and the improved vibration transmission characteristics of the integrated IWM are clarified in the frequency domain. Then, according to the sensitivity analysis theory, the sensitivity of the vertical dynamic response to the association structural parameters such as stator mass, stiffness and damping of rubber bushing and bearing is discussed. On this basis, the MCO of the association structural parameters is carried out by using the adaptive weighted PSO and FEM. After optimization and treatment, the overall mass of stator decreases by 9.35% when the structure strength is satisfied, the vertical dynamic characteristics of the integrated IWM system have been improved to varying degrees; particularly, the motor MGD gets more than 20% improvement. The results demonstrate that the proposed integrated scheme can observably improve the vehicle vertical dynamics and simultaneously the DVA system exhibits excellent performance in terms of wheel and motor vibration suppression. Keywords In-wheel motor · Integration design · Dynamic vibration absorber · Vibration transmission characteristics · Multi-objective collaborative optimization Abbreviations BVA Body vertical acceleration DVA Dynamic vibration absorber EVs Electric vehicles FEM Finite element method IWM In-wheel motor MCO Multi-objective collaborative optimization MGD Magnet gap deformation PSO Particle swarm optimization RMS Root mean square RSR Road surface roughness RWDL Relative wheel dynamic load SDD Suspension dynamic deflection VNE Vertical negative effects
Technical Editor: Wallace Moreira Bessa. * Qiang Wang [email protected] 1
School of Transportation, Shandong University of Science and Technology, Qingdao 266590, China
1 Introduction The IWM propelling system acts as the one of the key technologies for the development and application of distributed drive EVs. Its structural characteristics are that the driving motor, transmission and brake are all integrated into the wheel hub, and so that the power is transmitted directly to the driven wheels. Compared to the traditional EVs with centralized powertrains, the IWM EVs have great potential to achieve simpler chassis structure, higher driving efficiency and better dynamic control [1–4]. Neverth
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