electric Motor selection, the first thing is to correspond to the power of the working mode,
but also must determine the rated voltage, speed, type, frame size and current of the electric motor and other content.
The correct choice of electric motors power should follow the principle to ensure that the motor can meet the load of the equipment being towed, to the most economical and reasonable principle to choose the power of the electric motor.
Electric Motor power selection is too large, the direct consequence is a big horse-drawn car, is a waste of resources,.
At the same time, when the electric motor in the light load state operation, the electric motor efficiency will become worse, is also very uneconomical a thing;.
On the contrary, if the power selection is too small, it is very easy to run the process of overload problems, can not properly meet the work requirements at the same time, resulting in the motor due to overload problems winding overheating, shortening the life of the ac motor.
When choosing the ac motors power, must also take into account the starting and running process load stability, starting and overload operation, will directly affect the temperature rise of the ac motor, the winding temperature rise is extremely unfavorable to the operation of the inverter duty motor.
For special environment operation of the right electric motor, such as hot and humid environment, for the ac motors temperature control is particularly important, the motor customer should be specified in the order to ensure that the motor manufacturer to take the necessary measures to ensure.
The electric motor for centrifugal pumps are also a big demand in the market, when choose the motor,need to pay attention to the energy efficient.
In addition to the heat factor of the electric motor, the ac motor power should be selected with due consideration to the electric motor's overload capacity, that is, the degree of satisfaction of the motor's maximum torque.
Different series of Electric motor technical conditions, will specify the most motors allowable overload times, that is, the maximum torque times.
When choosing electric motors, the maximum torque that the motor can withstand in operation, which cannot exceed the maximum torque of the ac motor, can be verified according to equation (1).
Mmax ≦ λmMe.................. (1)
In the formula (1), λm is the permissible overload multiple of the three phase motor, Mmax is the maximum torque that the motor can withstand in operation, and Me is the rated torque of the motor. The value of λm in Eq. (1) varies according to the type of motor.
For asynchronous motors, λm is selected by 0.8~0.85 of the maximum torque times, mainly considering the impact on the maximum torque when the voltage is insufficient; for DC motors, λm is selected by 1.5~2; for lifting metallurgical motors, λm is selected by 2.5~3.
For direct starting cage motors, the necessary evaluation of starting performance must also be carried out.
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