The advantages and disadvantages of permanent magnet variable frequency screw air compressor

The advantages and disadvantages of permanent magnet variable frequency screw air compressor are as follows:

advantages:

energy efficient:

at full load, the permanent magnet variable frequency screw air compressor can produce a large amount of gas with minimum energy consumption.

When the load rate is less than 20%, it can maintain an operating efficiency of up to 95%, reaching the first-level energy efficiency standard.

Compared with the power frequency screw air compressor, it can save more than 39.7 percent of energy. Compared with ordinary frequency conversion air compressor, it can also save 10% of energy.

Stable air pressure and no impact at startup:

the stepless speed regulation characteristic of the frequency converter makes the air pressure stability greatly improved, especially suitable for the occasion of large fluctuations in gas consumption.

The impact of starting is small, the starting current is only within 1.2 times of the rated current, which is much lower than 6 times of the power frequency starting, and the impact on the power grid and mechanical system is greatly reduced.

Variable flow control and AC supply voltage adaptability:

the frequency converter can adjust the motor speed in real time according to the actual gas consumption, so as to control the displacement and realize the adjustment of the displacement in a wide range.

When the AC power supply voltage is slightly lower, due to the use of over-modulation technology, the inverter can still output enough torque to drive the motor.

Durable and low maintenance:

the use of rare earth permanent magnet synchronous motor direct drive screw host, at 120 ℃ without loss of magnetic, design life of up to 10 years.

The screw host and the motor of the permanent magnet variable frequency air compressor share the same spindle, and the transmission efficiency reaches 100%, eliminating the fault point of the motor bearing.

Low noise:

most of the working conditions of the frequency conversion system are lower than the rated speed, so the mechanical noise and wear of the host will be reduced, which helps to extend the maintenance and service life.

Disadvantages:

durability may be insufficient:

the internal structure of the permanent magnet variable frequency air compressor is relatively complex, and the maintenance cost is relatively high. It requires frequent professional maintenance and maintenance, which may affect its service life.

Electromagnetic compatibility to be improved:

when working, it will produce large electromagnetic interference, which may affect the operation of other electronic equipment, especially the electromagnetic fragile equipment.

High cost:

compared with traditional fixed frequency air compressors, the initial purchase price of permanent magnet variable frequency air compressors is usually higher, although in the long run, costs can be reduced through energy saving.

Professional maintenance needs:

due to the complex internal structure, professional technicians are required to maintain, which increases the difficulty and cost of maintenance.

Risk of demagnetization:

permanent magnet motors have the risk of demagnetization, especially when the motor is in a high temperature state for a long time, demagnetization is prone to occur.