Diagnosis of Broken Bars in V/F Control Induction Motor Drive Using Wavelets and EEV Estimation for Electric Vehicle Applications

Table 4

Frequency and amplitude of motor current in V/F control of IM.

Side band frequency (s = 0.045)	Estimated frequency (Hz)	Healthy state		Faulty state
		Frequency (Hz)	Amplitude (dB)	Frequency (Hz)	Amplitude (dB)
(1–4 s)	41	43	−82	44	−75
(1-2 s)	45.5	47	−62	48	−48
(1 + 2 s)	54.5	51	−61	52	−50
(1 + 4 s)	59	54	−81	55	−70