The power of the motor. To select the required power should be based on production machinery, try to keep the motor running at rated load. Options, should pay attention to the following points:

    (1> If the motor power is selected too small. Appears small horse cart "phenomenon, caused by the motor overload long-term to insulate heat damage. Even the motor is burned.

    (2) If the motor power option too. There will be a "big horse car" phenomenon. The output mechanical power can not be fully utilized, power factor and efficiency is not high, not only for users and grid. But can also cause energy waste.

    To select the correct motor power must go through the following calculation or comparison:

    For constant load continuous work, if you know the load power (ie, the production of mechanical shaft power) PL (kw). Can be calculated as the required motor power P (kW):

    (P = P1/n1n2)

    Wherein n1 is the efficiency of the production machinery; n2 is the efficiency of the motor. That transmission efficiency. Power obtained by the above formula, not necessarily with the same power. Therefore. The selected rated power of the motor should be equal to or slightly greater than the calculated power.

    Example: a production of mechanical power 3.95kw. The mechanical efficiency of 70%, if the selection efficiency of a motor of 0.8 Determine the motor power should kW?

Solution: P = P1 / n1n2 = 3.95/0.7 * 0.8 = 7.1kw

7.1kw - Specifications. So choose 7.5kw motor.