Motor power rating selection rules?
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First, the continuous work load of the machine should be the largest continuous rated motor, its rated power should be selected according to the shaft power of the machine. When the machine is started with a heavy load, the rated power of the squirrel-cage motor and the synchronous motor should be verified according to the starting conditions; for the synchronous motor, the pull-in torque should also be verified.
Second, the short-term work of the machinery should be short-term fixed motor, its rated power should be selected according to the shaft power of the machinery; when there is no suitable short-term fixed-size motor, the motor can be selected according to the allowable overload torque cycle work.
Third, the intermittent cycle of the work of the machinery should be used in the corresponding cycle of fixed-rate motor, the rated power should be based on the manufacturer's different load continuation rate and the allowable output power at different starting times to choose, but also according to the typical cycle of the equivalent The load conversion is selected for the rated load continuation rate, and the overload torque check should be allowed.
Fourth, the continuous duty cycle of the machinery should be used in the corresponding cycle of fixed-rate motor, the rated power should be selected according to the manufacturer to provide data, can also be selected by the equivalent current method or equivalent torque method, and should be allowed Overload torque check.
5. When selecting the rated power of the motor, the appropriate reserve factor should be included according to the type and importance of the machine.
6. When the altitude of the place where the motor is used and the temperature of the cooling medium are different from the specified working conditions, the rated power should be corrected according to the manufacturer's data.