Development of High-Speed Magnetization Estimator with Multi-Estimation Points in Permanent Magnet

Permanent magnet synchronous motors (PMSMs) are commonly used in electric vehicles, and their torque characteristics depend on the magnetization distribution (MD) in permanent magnets (PMs). Therefore, the application of inaccurately magnetized PMs can cause unexpected vibrations and noise in PMSMs. In this study, a magnetization estimation system is developed using multiple Hall sensors to measure the magnetic flux density around the PM and estimate the MD in a quick and inexpensive manner.