DC Motor | Questions & Answers

Q. Explain why a motor of smaller rating can be selected for a short time duty?

Answer. The short-time duty motor operates at a constant load for some specified periods which is then followed by a period of rest.

The period of the run (or load) is so short that machine cannot attain its steady temperature rise while the period of rest is too long that the motor temperature drops to the ambient temperature. Thus a motor of smaller rating can be operated with a larger power output for the maximum temperature rise in a short duration.

Q. Explain why a motor of smaller rating can be selected for a short time duty?

Answer. The short-time duty motor operates at a constant load for some specified periods which is then followed by a period of rest.

The period of the run (or load) is so short that machine cannot attain its steady temperature rise while the period of rest is too long that the motor temperature drops to the ambient temperature. Thus a motor of smaller rating can be operated with a larger power output for the maximum temperature rise in a short duration.

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