Abstract: With the rapid development of new energy vehicles and high-efficiency industrial motors, higher requirements are put forward for magnetic properties of motor stator cores. Traditional magnetic test of raw electrical steel cannot characterize the influence of processing stress such as stamping, welding and riveting residual stress, as well as actual operating conditions on core magnetic loss. In this paper, an integrated magnetic measurement system for stator core composed of harmonic power supply, magnetic measuring device, power analyzer and special acquisition software is built. The system composition and principles of precise excitation, parameter adjustment and real-time acquisition control are described. New magnetic measurement methods are formed by introducing multi-physical field coupling, multi-sensor fusion and automatic process optimization. Engineering application shows that the system can accurately detect core iron loss and magnetization under different sizes, frequencies and magnetic flux densities. It plays an important supporting role in motor design and material selection, manufacturing process optimization and electrical steel research, and provides practical basis and technical reference for electrical steel application and motor performance improvement.

Key words: motor stator core; magnetic performance test; magnetic measurement system; multi-physical field coupling; electrical steel application