Motor Encyclopedia: how to change the frequency of use of motor

In the current market, the frequency of the motor is only 50HZ, 60HZ these two. When the rated voltage and the use of voltage phase at the same time, 60HZ of the motor is not directly used for the 50HZ power supply. For increased 1. Each of the magnetic flux, the core loss will increase, increase the excitation current, winding copper loss will increase, the two losses will reduce the efficiency of the motor, temperature rise up; 2. Motor speed was reduced, and heat dissipation problems arise, temperature rise also increased; 3. The exciting current increases will make the motor power factor decreased. In the same way, the 50HZ motor is not directly used for the 60HZ power supply.

A. if the required power is constant, then

For example, the rated voltage 450V/60HZ of the motor can be directly connected to the 380V/50HZ power supply, then the motor output power remains unchanged.

B. if torque is constant, then

For example, the rated voltage 450V/60HZ of the motor can be directly connected to the 380V/50HZ power supply, if the torque of the motor to keep the same, then the output power should be reduced by 16.7%.

Motor voltage can pressure regulator for implementation and can also fold change of stator windings to achieve, in the demolition of the original winding should do the original records, wire gage, each coil number, and around root number, parallel branches. When the voltage and the original voltage are used, the simple calculation of the heavy change winding is as follows.

N50-50HZ when the number of windings of each slot winding; N60-60HZ when the number of windings per slot winding;

Conductor cross-sectional area of the corresponding reduction of about 10%, if the motor original slot full rate is not high, 50Hz motor and cross-sectional area of conductor can change, tear open change winding, the output power of the motor remained basically unchanged.