Conference: 2026 한국자동차공학회 춘계학술대회
Authors: 홍영진, 배예나, 이승훈, 곽병길, 임명섭
DOI:
Carrier-phase shifting between the two inverters (CPS-PWM) is an effective method for reducing switching-frequency torque ripple and acoustic noise in dual three-phase drives. However, despite its benefit in torque smoothing, this technique can intensify high-frequency current ripple. This phenomenon arises from the magnetic coupling between the two winding sets through the leakage inductance Lls which may lead to increased copper and iron losses, potentially offsetting the intended performance improvement. This paper investigates the role of Lls in determining the effectiveness of CPS-PWM. An analytical framework is established to describe the relationship between Lls and the switching-induced current ripple components. The proposed model is validated through both time-domain simulations and finite-element analysis, considering three winding configurations characterized by low, medium, and high leakage inductance. The results indicate that increasing Lls significantly suppresses PWM-related current ripple, resulting in reduced torque ripple and negligible efficiency degradation. In contrast, a small Lls tends to aggravate both torque ripple and overall losses. These findings provide practical design insights for selecting appropriate winding configurations in dual three-phase machines employing CPS-PWM.