澳门新莆京8455.com 0 2018-08-29
Permanent magnet variable frequency screw air compressor in order to balance the exhaust volume of air compressor with the amount of air used by users, the common air volume regulation methods of ordinary air compressor are intake throttle regulation, loading/unloading regulation and so on. Because of the existence of intake throttle resulting in excessive vacuum, as well as the loss of pressure difference during loading and unloading, these methods save energy. The effect is not ideal.
Later, due to the development of motor frequency conversion control technology, there was a way to control the motor speed. This way can make the air compressor power consumption and exhaust volume close to linear proportion change, is gradually popularized. But this control method has the following drawbacks:
1. When the speed and load of the ordinary asynchronous motor are less than the rated point, the efficiency of the motor decreases obviously, and the greater the difference, the more obvious the efficiency decreases.
2. When the ordinary asynchronous motor runs at a lower frequency, the problem of insufficient output torque will occur, which makes the inverter appear "motor torque overload" and jump fault.
3. The common asynchronous motor will appear unstable rotational speed, increased vibration and noise, increased calorific value when it runs at lower frequency. Even though the current vector control method can not completely eliminate these shortcomings.