Efficiency improvement of permanent magnet vernier motor for automobile applications

• Main Author: Meng, Xinyu
• Other Authors: Christopher H. T. Lee
• Format: Thesis-Master by Coursework
• Language: English
• Published: Nanyang Technological University 2023
• Subjects: Engineering::Electrical and electronic engineering
• Online Access: https://hdl.handle.net/10356/169075
• Institution: Nanyang Technological University

Permanent magnet vernier (PMV) motors have the benefits of simple construction, high power density, fast response and high precision control, which make them an ideal motor choice in many applications. Due to flux-modulation, there are plenty of harmonics in the PMV motors’ airgap. These harmonics provide high torque density while increasing losses and reducing efficiency, which makes it difficult to meet the needs of electric drive fields with high efficiency requirements, such as automobiles. Therefore, the analysis and suppression of PMV motor losses are of great importance. To enhance the performance of PMV motors, this study clarifies the design approach to increase the efficiency by investigating the loss mechanism. The PMV motor's loss and torque generation mechanism is examined in this work, and the motor's construction is only optimized. On the basis of the analysis, a solution is then suggested for efficiently suppressing the motor losses. Losses in the PMV motor are significantly decreased by placing flux barriers on the rotor and stator. Finally, a thorough analysis and a comparison of performance between the newly developed PMV motor and the old motor is conducted.