Design Process of Post-Assembly 3-Times Magnetizer for 10-Poles of Flux Concentrated Rotor Considering Eddy Current Effect

Abstract

The post-assembly magnetizer for flux concentrated rotor of permanent magnet synchronous motor is dealt with in this paper. The design process of a magnetizer that is able to fully magnetize the permanent magnet (PM) inserted rotor core assembly within 3-times is discussed. The number of turns of the Main-pole winding and the Inter-pole winding was determined to maximize the magnetization ratio in each magnetization stage. At the same time, demagnetization characteristic is also examined. When the magnetizer is designed, the number of turns of winding is determined considering the eddy current generated in the core. The magnetization ratio of the PM considering the eddy current effect is compared with the magnetization ratio of the designed magnetizer when the eddy current effect is ignored. Finally, the properties of the finally designed magnetizer are verified through fabricated magnetizer and experiments.

Optimal Design Method of Post-Assembly Magnetizing Device with Field–Circuit Coupling Analysis

“…The impact of a soft magnetic material type of fixture is also compared [10]; the fixture using solid steel as the soft magnetic material consumes much more energy to generate a sufficient magnetizing field due to the induced eddy currents. Thus, the pulse-width is increased by optimizing the coil structure, in order to weaken the eddy currents [11,12]. For a line-start IPMSM, rotor bar dimensions are further researched, considering the induced currents in the squirrel cage [13].…”