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Table 5 DFT estimation results with different lengths of data window

From: Broken Rotor Bar Fault Detection of Induction Motors Using a Joint Algorithm of Trust Region and Modified Bare-bones Particle Swarm Optimization

Parameter True value Different lengths of data window
2 s 3 s 4 s
Amplitude A1 (A) 10 10.0917 9.9904 10.0677
Frequency f1 (Hz) 50 50.000 50.000 50.000
Phase φ1 (rad) − π/4 − 2.3562 − 2.3562 − 2.3562
Amplitude A2 (A) 0.2 0.1417
Frequency 2sf1 (Hz) 0.4 0.5000
Phase φ2 (rad) π/2 1.3516
Amplitude A3 (A) 0.2 0.1423
Phase φ3 (rad) π 2.7031