Electronics and Communication Engineering - Power Electronics - Discussion

Discussion Forum : Power Electronics - Section 2 (Q.No. 6)
6.
A dc separately excited motor has a constant field current. The armature is fed from a single phase supply through a semi-converter. When a = 0, speed is 600 rpm. If a = 90°, the speed is likely to be
about 300 rpm
about 150 rpm
about 75 rpm
about zero
Answer: Option
Explanation:

Average output voltage is reduced to 50% if a = 90°. Hence speed is also reduced to 50%.

Discussion:
2 comments Page 1 of 1.

Pvkrishna said:   7 years ago
Here, v is propotional to (1+cosa) for semi converter.

Prakash said:   3 years ago
It Should be option D.

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