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A separately excited 300 V DC shunt motor under no load runs at 900 rpm drawing an armature current of 2 A. The armature resistance is 0.5 Ω. and leakage inductance is 0.01 H. When loaded, the armature current is 15 A. Then the speed in rpm is _____.
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- 450 rpm
- 880 rpm
- 240 rpm
- 580 rpm
Correct Option: B
Given 300 V1
N1 = 900 rpm
Ra = 0.5 Ω
Ia1 = 2 A;
Ia2 = 15 A
∴ Eb1 = 300 – 2 × 0.5 = 299 V
Eb2 = 300 – 15 × 0.5 = 292.5 V
| ∴ | = | |||
| N1 | Eb1 |
| ⇒ N2 = 900 × | = 880 rpm | |
| 29 |
