How much do you know about the advantages of permanent magnet variable frequency air compressor?

With advancements in technology, air compressors have become essential pneumatic equipment, widely used across industries such as machinery, building materials, electronics, chemicals, food, and textiles. However, air compressors are also high-energy consumers, with some industries seeing over 30% of their electricity usage tied to these machines. In 2011, energy-saving air compressor technology was officially promoted, and today, permanent magnet variable frequency (PMVF) air compressors have emerged as a popular choice due to their high efficiency, energy savings, and stable pressure. These new-generation compressors are gradually replacing traditional energy-consuming models, offering users cost savings of 30-40%.

The Technology Behind Permanent Magnet Variable Frequency Air Compressors

PMVF air compressors rely on the principles of permanent magnet synchronous motors, which use rare earth materials. Their operation is similar to that of electric excitation synchronous motors, with the key difference being the replacement of excitation windings with permanent magnets. When the three-phase stator windings of a PM motor are connected to a three-phase AC supply, a rotating magnetic field is generated. This magnetic field moves at a synchronous speed, and the rotor, driven by this field, also rotates at synchronous speed. The stator's rotating magnetic field remains stationary relative to the magnetic field of the permanent magnet, resulting in electromagnetic torque that drives the motor. In PMVF air compressors, the permanent magnet motor and the screw main unit share a single shaft, with the rotor directly installed on the male rotor's extended shaft, achieving 100% transmission efficiency. This design eliminates the need for motor bearings, reducing failure points and making the motor maintenance-free.

Advantages of Permanent Magnet Variable Frequency Air Compressors

1. Stable Air Pressure: Thanks to the frequency converter's stepless speed regulation, PMVF air compressors can start smoothly and quickly adjust to fluctuations in air demand through a controller or PID regulator.

2. Soft Start Feature: The frequency converter allows for a "soft start," providing protection for the motor and reducing the risk of motor burn-out. The maximum starting current remains within twice the rated current, minimizing the impact on both the power grid and the mechanical system.

3. Variable Flow Control: PMVF air compressors operate within a wide range of exhaust volumes. The frequency converter adjusts motor speed in real-time based on actual air demand, optimizing energy use. When demand is low, the compressor can automatically enter a dormant state, further reducing energy loss.

4. Adaptability to Power Supply: PMVF air compressors are highly adaptable to variations in AC power supply voltage. The frequency converter uses overmodulation technology to ensure sufficient torque at lower voltages and prevent excessive voltage at higher levels. This makes them particularly advantageous in settings with unstable power supply.

5. Reduced Noise and Vibration: Operating below rated speed in most conditions, PMVF air compressors produce less mechanical vibration, lower noise, and reduced wear, extending maintenance intervals and service life. If the fan is also frequency-driven, operational noise can be further minimized.

6. Compact and Lightweight Design: The permanent magnet motor in PMVF compressors is half the size and a third of the weight of conventional three-phase motors. The overall machine is more compact, and maintenance costs are lower, as it requires about 50% less lubricating oil compared to standard screw air compressors.

7. Durability and Efficiency: The rare earth permanent magnet synchronous motor used in PMVF compressors is resistant to demagnetization up to 120°C, with a service life of up to 10 years. The integrated design of the screw main unit and motor, without the need for belts or couplings, ensures a transmission efficiency of 99%. The absence of motor bearings further enhances durability and reduces maintenance needs.

Conclusion

The numerous advantages of permanent magnet variable frequency air compressors—cost savings, energy efficiency, environmental protection, and low noise—make them an exciting choice for any industry. When selecting a PMVF air compressor, be sure to consult with a knowledgeable salesperson about the energy-saving benefits, choose a reputable brand, and avoid counterfeit products to ensure the best results.