Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?
Correct answer: E. All of the above
- A. Increased I R losses
- B. Increased core losses
- C. Poor commutation
- D. Change in motor parameters
- E. All of the above
Explanation
Thyristor bridge supplies produce ripple and harmonics in the motor current, causing higher copper and core losses and often poorer commutation; their operating conditions can also alter effective motor parameters. Hence all the listed effects can arise.
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