Vibration Fault Frequency
1X, 2X, Rotor bar, BPFO, BPFI, BSF, FTF
Shaft frequency (1X)
24.5Hz
1,470 rpm
Slip
2%
Synchronous 1,500 rpm · slip freq. 1 Hz
| Frequency | Hz | CPM | Order |
|---|---|---|---|
| 1X (running speed)Unbalance | 24.5 | 1,470 | 1× |
| 2XMisalignment, looseness | 49 | 2,940 | 2× |
| 2 × line frequencyStator / electrical (air gap, soft foot) | 100 | 6,000 | 4.08× |
| Pole pass frequency1X-এর দুই পাশে sideband: rotor bar সমস্যা | 4 | 240 | 0.16× |
Rotor bar ও bearing frequency (BPFO, BPFI, BSF, FTF) দেখতে Advanced mode-এ geometry দিন।
1. Synchronous speed
120 × 50 ÷ 4
= 1,500 rpm
2. Slip
(1500 − 1470) ÷ 1500
= 0.02
3. Shaft frequency fr
1470 ÷ 60
= 24.5 Hz
4. Slip frequency
0.02 × 50
= 1 Hz
Bearing: BPFO = n/2·fr(1 − d/D·cos α), BPFI = n/2·fr(1 + d/D·cos α), FTF = fr/2(1 − d/D·cos α), BSF = D/(2d)·fr(1 − (d/D·cos α)²)