Effects of the Slot Harmonics on the Stator Current in an Induction Motor with Bearing Fault

Table 2

The experimental results of healthy and faulty motors under several different load conditions.

State
Fault	23.8500	85.8600	Calculated/Hz	135.9279	159.7779	627.2721	727.4079	775.1421	875.2779
			Estimated/Hz	135.9463	159.6451	626.4210	727.1767	774.5743	874.6624
			Amplitude/dB	−66.9323	−69.9651	−72.6639	−74.7578	−77.3310	−73.2667
Health	23.8500	—	Amplitude/dB	−76.2459	−77.6033	−81.5884	−82.4756	−82.0215	−82.0451
Fault	23.9655	86.2758	Calculated/Hz	136.3437	160.3092	630.5523	730.6881	779.1384	879.2742
			Estimated/Hz	136.3277	160.1696	629.2343	730.6576	777.1015	878.1433
			Amplitude/dB	−67.8734	−75.5752	−77.3139	−78.9183	−81.8125	−77.7823
Health	23.9655	—	Amplitude/dB	−79.1248	−84.4931	−85.4721	−85.9430	−85.1713	−85.4535
Fault	24.0907	86.7265	Calculated/Hz	136.7944	160.8851	634.1080	734.2438	783.4703	883.6061
			Estimated/Hz	136.7569	160.6941	633.7643	733.6617	783.1097	882.5779
			Amplitude/dB	−66.9565	−80.2746	−77.7492	−78.7337	−81.7378	−77.8168
Health	24.0907	—	Amplitude/dB	−84.4098	−85.5045	−85.3693	−85.1180	−85.2143	−85.2862
Fault	24.1980	87.1128	Calculated/Hz	137.1807	161.3787	637.1553	737.2911	787.1829	887.3187
			Estimated/Hz	137.1384	161.2186	637.2929	736.4750	788.3072	888.9675
			Amplitude/dB	−70.0095	−77.2724	−77.8660	−79.1447	−81.7262	−78.4580
Health	24.1980	—	Amplitude/dB	−78.0160	−82.9799	−85.0438	−85.4245	−85.2521	−85.6223