How to choose the right cheap power motor?The power of the motor.According to the production machinery needs to choose the power, as far as possible to make the motor under the rated load.The following two points should be paid attention to when choosing:
1. If the power of the motor is too small.There will be a "small horse cart" phenomenon, resulting in long-term motor overload.The insulation is damaged by heat.Even the motors were burned.
2. If the motor power is too high.There will be a "big horse-drawn cart" phenomenon.Its output mechanical power can not be fully utilized, the power factor and efficiency are not high, not only to the detriment of users and the power grid.It also wastes electricity.
In order to correctly select the motor power, the calculation or comparison must be made as follows :(1) the constant load continuous working mode, if the load power (i.e., the power in the production machine shaft) PL (kw) is known, the required motor power P(kW) can be calculated according to the following formula :P = P1 / N1N2 N1 is the efficiency of the production machine;N2 is the efficiency of the motor.Transmission efficiency.The power calculated by the above formula may not be the same as the product power.So.The rated power of the selected motor shall be equal to or slightly greater than the calculated power
3. Motors with short-term work quota.Compared with a motor with the same power and continuous operating rating.High maximum torque, low weight and low price.Therefore, when conditions allow possible, should try to choose a short - time working quota of the motor.
4.For the motor with intermittent operation quota, the power should be selected according to the load continuity rate, and the motor specially used for intermittent operation mode should be selected.
