Failure Diagnosis for Demagnetization in Interior Permanent Magnet Synchronous Motors

Table 1

Dimension of PMs.

PM	[mm]	[mm]	[mm]	[mm^3]
Healthy	22.6	20.2	2.2	16070	—
-2.5%	22.6	20.2	2.0	15704	0.977
-5.0%	22.6	20.2	1.8	15339	0.955
-7.5%	22.6	20.2	1.6	14974	0.932
-2.5%	18.0	20.2	2.2	15661	0.975
-5.0%	13.4	20.2	2.2	15252	0.950
-7.5%	8.8	20.2	2.2	14843	0.924