What is a permanent magnet screw variable frequency air compressor

Permanent magnet screw variable frequency air compressor is a fusion of permanent magnet synchronous motor technology, screw compression technology and variable frequency drive technology of high efficiency and energy saving air compression equipment. Its core composition and operating principle are as follows:

1. Technical Composition Analysis

1. permanent magnet synchronous motor
   • using rare earth permanent magnet materials (such as neodymium iron boron) to replace the excitation winding of the traditional motor, the motor rotor has no current, which fundamentally eliminates the rotor loss. This design improves the efficiency of the motor, and the energy saving effect is remarkable compared with the asynchronous motor.
2. Screw compression host
   • it is composed of a pair of precision meshing male and female rotors, which realize air suction, compression and discharge through high-speed rotation. The surface of the rotor adopts supersonic spraying technology, and the coating hardness can reach above HRC70, ensuring stable long-term operation clearance and high volumetric efficiency.
3. variable frequency drive system
   • through the vector control algorithm, the motor speed is adjusted in real time to match the actual gas demand. For example, when the gas consumption is reduced, the speed can be reduced to 50% of the rated value, and the power consumption will be reduced.

2. working principle

1. intake stage
   • the inverter calculates the required speed according to the pipe network pressure signal fed back by the pressure sensor. For example, when the pipe network pressure drops to a set value, the drive motor accelerates and the screw rotor rotates to inhale air.
2. Compression stage
   • the male and female rotors mesh with each other, and the air is gradually compressed between the tooth slots. By optimizing the design of the rotor profile, the compression process is close to isothermal compression and the specific power is low.
3. Exhaust phase
   • the compressed air is cooled by the cooler and then enters the air storage tank for buffering. The frequency converter continuously monitors the pressure change, dynamically adjusts the motor speed, and maintains the stability of the pipe network pressure.

3. performance advantages

1. high efficiency and energy saving
   • the permanent magnet motor has high efficiency, and the variable frequency adjustment makes the comprehensive energy efficiency ratio (SER) low. For example, under variable load conditions, energy saving compared to fixed frequency models.
2. Pressure stability
   • the pressure bandwidth can be controlled within ± 0.01MPa to meet the requirements of precision manufacturing for pressure stability. For example, in an electronic component assembly line, air pressure fluctuations can cause a drop in the accuracy of the placement machine.
3. intelligent control
   • equipped with a touch screen controller, it can preset a variety of working modes (such as timing start and stop, pressure threshold adjustment), and supports Modbus-TCP protocol access to the plant energy management system.
4. Convenient maintenance
   • the modular design is adopted, and the replacement time of key components (such as oil separation core and intake valve) is short. Water lubricated models do not need to change the lubricating oil, low maintenance costs.

4. typical application scenarios

through technology integration, the permanent magnet screw variable frequency air compressor has realized the efficient, intelligent and reliable operation of the air compression system, and has become an important choice for modern industrial energy-saving transformation.