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An ac induction motor is used for a speed control application. It is driven from an inverter with a constant V/f control. The motor name-plate details are as follows :
V = 415 V, Ph = 3, f = 50 Hz, N = 2850 rpm
The motor is run with the inverter output frequency set at 40 Hz, and with half the rated slip. The running speed of the motor is
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- 2400 rpm
- 2280 rpm
- 2340 rpm
- 2790 rpm
Correct Option: C
Given : Ns = 3000 rpm
| ∴ s = | = | = 0.05 | ||
| 3000 | 3000 |
| Now , Ns = Ns | = 2400 rpm | |
| 50 |
| ∴ Running speed of the motor, Nr = |  | 1 - |  | . Ns' = (1 - 0.025) . 2400 = 2340 rpm | |
| 2 |
