Does the screw air compressor motor stop

Whether the motor of the screw air compressor continues to run depends on its control mode and actual work requirements. The following is a detailed analysis:

1. regular working mode

• loading/Unloading Cycle:
  most screw compressors manage the operating state through pressure switches or controllers:

  • loading Status: When the system pressure is lower than the set lower limit (such as 6bar), the motor continues to run and the air compressor produces compressed air.
  • Unload Status: When the pressure reaches the set upper limit (such as 8bar), the intake valve closes and the motor still runs but no longer compresses the gas (idling).
    At this time, the motor does not stop, but maintains the system pressure through idling to avoid damage to the motor and equipment caused by frequent start and stop.

• Automatic shutdown function:
  some air compressors are equipped with energy-saving control modules. If there is no gas demand for a long time (such as several minutes to several hours), the motor may stop automatically. A short wait is required when restarting, which is suitable for scenarios with large fluctuations in gas consumption.

2. The reason why the motor does not stop

• maintain pressure stability frequent start and stop will lead to pressure fluctuations, equipment loss and increased energy consumption, so most air compressors are designed for continuous operation.

• control strategy: The energy consumption of the air compressor during unloading is about 30%-50% of the full load, but the energy consumption of starting and stopping once may be higher than that of continuous idling for several minutes.

• Equipment protection: Avoid overheating, insulation damage and other problems caused by frequent start and stop of the motor.

3. Special circumstances

• fault or abnormal: If the motor continues to run at full load (without unloading), it may be due to excessive air consumption, air leakage in the system or improper pressure setting, which needs to be checked and handled.

• frequency conversion control: Some screw machines use frequency converters to adjust the speed, and the motor may run at low speed instead of completely stopping to match real-time gas consumption and improve energy efficiency.

4. Energy Saving Suggestions

• set the pressure belt reasonably: Reduce the loading/unloading pressure difference (e. g. from 6-8bar to 7-8bar) and reduce idling time.

• Install gas tank: Buffer gas fluctuation, extend the unloading cycle.

• Check the air leakage point: Reduce invalid gas consumption and reduce motor running time.

• Consider frequency conversion transformation: During long-term low-load operation, frequency conversion control can significantly reduce energy consumption.

Summary

the screw compressor motor usually does not stop completely, but maintains a stable pressure through the load/unload cycle. This is a balanced design choice to extend equipment life and reduce energy consumption fluctuations. If further optimization is needed, more accurate energy management can be achieved by adjusting the control strategy or upgrading equipment (such as variable frequency models).