Standard AC Motor Question 3: Why Reversible Motor can only run at 30 minutes rating?

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Standard AC Motor: Why Reversible Motor can only run at 30 minutes rating?

Question 3:	Why Reversible Motor can only run at 30 minutes rating?
Answer:	The temperature of reversible motor is higher than induction motor because of the current flowing into the reversible motor is higher. Due to the temperature limit of the reversible motor, the temperature on motor case cannot exceed the permissible temperature of 90°C on motor case. The motor operating time / temperature rise characteristics is shown in fig1.
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