Detection Technique for Manufacturing Imperefection of Rare-earth Magnets on IPMSM

Imperfect rare-earth magnets due to unavoidable imperfection during slicing/grinding, magnetizing and assembling processes significantly degrade the performance of interior permanent magnet synchronous motor. The robust design strategies during the stable manufacturing process can ensure the reliability of the end products. However, if there is the imperfection of the production quality distribution due to assignable causes, only robust design strategies cannot guarantee complete reliability. Therefore, detection techniques for assignable causes are essential to ensure the reliability of the end products. For this reason, the detection technique is suggested in this paper. The detection technique can be used to detect the indicators of process control in consideration of the imperfections of the rare earth magnets in the manufacturing process has been studied.