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A three-phase 440 V, 6 pole, 50Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor with respect to stator magnetic field are
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- zero, – 5 rpm
- zero, 955 rpm
- 1000 rpm, – 5 rpm
- 1000 rpm, 955 rpm
- None of the above
Correct Option: E
| Ns = | = | = 1000 rpm | ||
| P | 6 |
Rotor speed = Ns – SNs = 950 r.p.m.
Stator magnetic field speed, Ns = 1000 r.p.m.
Rotor magnetic field speed, Ns = 1000 r.p.m.
Relative speed between stator and rotor magnetic fields is zero
Rotor speed with respect to stator magnetic field = 950 – 1000 = – 50 r.p.m.
