전동기는 자주 ON, OFF 를 반복 할 경우 수명이 짧아지게 된다. 따라서 NEMA MG1에서는 아래와 같이 기동 횟수에 관해 정리해 두고 있다.

20.43 NUMBER OF START

20.43.1 Squirrel-cage induction motors( or induction generators specified to start and accelerate a connected load) shall be capable of making the following starts, providing the WK^2 of the load, the load torque during acceleration, the applied voltage, and the method of starting are those for which the motor was designed.

a. two starts in succession, coasting to rest between starts, with the motor initially at ambient temperature.

b. One start with the motor initially at a temperature not exceeding its rated operating temperature.

20.43.2 If additional starts are required, it is recommended that none be made until all conditions affecting operation have been thoroughly investigated and the apparatus has been examined for evidence of excessive heating. It should be recognized that the number of starts should be kept to a minimum since the life of the motor is affected by the number of starts.

NEMA MG1-1993, REV2, Part20, page 6 에서 인용하였음을 알림.

본 내용에 어떠한 상업적 의도가 없음을 알림.