Enhancing Noise and Vibration Performance for a Traction Squirrel Cage Induction Machine Through Rotor Design Optimization

With their durable and simple design, squirrel cage induction machines (SCIMs) have become the preferred choice for electric vehicle (EV) traction application, featuring robust construction that withstands challenging terrains and allowing for cost-effective maintenance, thereby contributing to their widespread adoption in the electrified transportation industry for enhanced reliability and efficiency. Nevertheless, the optimal functionality of the SCIM relies heavily on its electromagnetic design, specifically concerning the rotor geometry. It is imperative to address critical aspects of noise and vibration (NV) in the design process to maximize the electromagnetic performance of the machine, an aspect that was previously neglected. In order to improve the electromagnetic related performance of the SCIMs while keeping the NV aspects at a desired level, this paper focuses on the concurrent modification of the rotor slot shapes of one traction induction machine. In this regard, the initial focus will be on studying the impact of diverse rotor slot and bar shapes on the electromagnetic performance. Subsequently, the electromagnetic force will be computed utilizing the Maxwell stress tensor method. Modal analysis will then be employed to investigate the inherent characteristics of the machine. Following comparisons with alternative scenarios, the machine's optimal performance will serve as a case study, facilitating a comprehensive NV analysis.