What are the differences between frequency conversion and constant frequency of Roots blower?

Original title: What are the differences between frequency conversion and constant frequency of Roots blower

Xinqianshun Machinery introduces the frequency conversion and constant frequency of the motor during the use of Roots blower 。

During this use, the frequency conversion motor of Roots blower must be used together with the frequency conversion cabinet, and the frequency conversion cabinet must control the motor speed. Another unknown thing is that the frequency converter can also be realized by connecting the frequency converter cabinet to the ordinary motor.

1. Difference between variable frequency motor and fixed frequency motor

The frequency conversion motor can change the speed of the motor by adjusting the Hertz of the motor, and change the speed of the main engine of the Roots blower by adjusting the speed, so as to control the displacement of the machine. The speed of the constant frequency motor is fixed, which cannot be adjusted. To change the engine speed, only the diameter of the pulley can be modified. The advantage of frequency converter is that the air volume adjustment is flexible, and it is not convenient to change the air volume for constant frequency.

2. Frequency conversion cabinet is required when using frequency conversion motor

The frequency conversion motor must be adjusted through the frequency conversion cabinet when in use, and the motor itself cannot be adjusted! The frequency conversion cabinet needs to be prepared by the user.

3. Common motor is adjusted with frequency conversion cabinet

Even for ordinary motors, the speed can be adjusted through the frequency conversion cabinet. In this case, the damage to ordinary motors will be great, and the motors will be damaged faster. During operation, harmonic voltage and current of different degrees will be generated, which will cause the increase of stator copper loss, rotor copper loss (aluminum loss), iron loss and additional loss, notably rotor loss. These losses will make the motor generate additional heat, reduce efficiency and output. When the inverter is used to run an ordinary motor, the load of the motor will increase. It is recommended to use frequency conversion motor for Roots blower motor when it is adjusted by frequency converter.

The above is: What are the differences between frequency conversion and constant frequency of Roots blower? I hope it can help you!