System-Level Vibration Optimization for a Consequent-Pole In-Wheel Motor Based on Multiple Dominant Sources Cosuppression

In this article, a new system-level optimization methodology is proposed to suppress motor vibration, where multiple dominant vibration sources under multiple operation conditions are involved and coreduced. By analyzing the influence of suspension dynamics on vibration characteristics, the dominant vibration sources, such as radial force and torque ripple, are related and functioned as design objectives. In addition, by further considering the change in the driving cycle, the dominant vibration sources, such as transient speed fluctuation, are discovered and considered as the objectives. For in-depth investigation, a U-shape consequent-pole permanent-magnet in-wheel (CPPM-IW) motor is selected as a design example. In the optimization process, the multicondition optimization method in motor level is adopted to reduce a part of the dominant vibration sources, such as torque ripple at low speed. Furthermore, the optimization model based on integrated control method in control level is proposed to coreduce some dominant vibration sources, such as radial force at high speed. Finally, the CPPM-IW prototype motor is manufactured. Both the theoretical analysis and experimental test verify the feasibility of the proposed motor and systematic low-vibration optimization method.