- 2 poles
- 6 poles
- 4 poles
- 8 poles
- 120 dB (A)
- 130 dB (A)
- 140 dB (A)
- 115 dB (A)
- 90 dB (A)
- 85 dB (A)
Q) An induction motor with 1000 r.p.m. speed will have
Solution:
The formula is n = 60 x f /p
Where n = synchronous speed; f = supply frequency & p = pairs of poles per phase.
1000=60*50/P
P=60*50/1000
P=3 Pair of Poles or 6 poles
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