Direct Measurement and Analysis of Iron Loss Using the H-coil Method During Low-order Harmonic Current Suppression in PMSMs

Permanent Magnet Synchronous Motors (PMSMs) offer advantages such as high output power and high efficiency. To further enhance their efficiency, control methods considering iron loss have been developed. However, few studies have directly measured iron loss due to the challenges involved, and even fewer have compared different control strategies based on direct measurements. This paper applies Repetitive Perfect Tracking Control (RPTC) to suppress iron loss caused by low-order harmonic currents in PMSMs. An H-coil method, which uses ingenious motor structure and data processing, is employed to directly measure magnetic field strength and magnetic flux density, thereby enabling iron loss measurement. Experimental results demonstrate that RPTC reduces iron loss compared to conventional PI control under varying load and speed conditions.