Permanent magnet variable frequency air compressor advantages and disadvantages

as a kind of air compressor, permanent magnet variable frequency air compressor occupies an important position in the compressor market. So what are the advantages and disadvantages of permanent magnet variable frequency air compressor?

Permanent magnet variable frequency air compressor advantages:

1, reduce the impact, reliable operation

the permanent magnet variable frequency air compressor starts smoothly, avoids the current peak value, operates with frequency conversion after starting to the rated pressure, tracks the gas production through stepless variable speed through pressure detection, and outputs the gas required by the user under the condition of keeping the pressure unchanged, which not only reduces the power consumption but also avoids the impact of star-delta starting on the power grid and the air compressor.

2. Constant voltage power saving

when the ordinary air compressor is running, the pressure has been fluctuating within the range of 0.7bar above and below the rated pressure. Compared with the variable frequency air compressor, the pressure can be stabilized within the range of 0.1bar above and below the rated pressure. During normal operation, 8.4% of power consumption can be saved (7% more power consumption for every 1bar increase in operating pressure). In particular, the frequency conversion air compressor saves up to 45% of the power consumption compared with the ordinary air compressor during unloading operation. At the same time, the quality of gas supply is improved, and the reliability and life of air compressor and gas equipment are improved.

3, AC power supply voltage adaptability

due to the over-modulation technology adopted by the inverter, it can still output sufficient torque to drive the motor when the AC power supply is slightly lower; when the voltage is slightly higher, it will not cause the output motor to have a high voltage.

4. Low noise

most of the working conditions of the frequency conversion system are lower than the rated speed, the main machine mechanical noise and wear are reduced, and the maintenance and service life are extended;

permanent magnet frequency conversion air compressor shortcomings:

1. The motor temperature is too high

2. Risk of demagnetization

the motor used in the permanent magnet variable frequency air compressor is a permanent magnet motor, and the weakness of this kind of motor is the fear of demagnetization. The magnetic steel determines the demagnetization. The motor is in a high temperature state for a long time and is prone to demagnetization.

3. High failure rate

since the rotor of the integrated permanent magnet variable frequency air compressor is directly installed on the screw rotor, the bearing on the rotor side of the screw motor has to bear a load more than 2 times larger than the original load, so the bearing and oil seal on the motor side are more than 2 times lower than the original life.

4, maintenance is relatively troublesome

because the rotor of the permanent magnet motor is a permanent magnet, the motor must be removed before the head can be removed during the maintenance of the head. The permanent magnet rotor has a strong attraction, and the removal needs to be operated by professionals, otherwise it is easy to cause accidents.