How to determine the motor speed?

The rated speed selection of the motor should be considered according to the requirement of dragging production machinery and the proportion of transmission device. The RPM of the motor is usually 3000, 1500, 1000, 750 and 600, etc. The rated speed of the asynchronous motor is 2% ~ 5% lower than the above speed.

From the motor manufacturing point of view, if the rated speed, the higher the same power of motor, the electromagnetic torque shape size is small, the cost is low and also light in weight, and high speed motor power factor and efficiency is higher than the motor at low speed. If can choose to speed the higher the motor, the economy is better, but if this caused by the motor and the speed difference between being dragged machinery is too large, the required to furnish the reduction gear drive series, the more it will increase the cost of equipment and the energy loss in the transmission. Therefore, we need to analyze and compare the choice.

Most of the motors we use are the motors with a 4 pole 1500r/min, because the motors with the rated speed are widely used, and their power factors and work efficiency are high.