Air Compressors Inverter Application Cases

Applications of the SP600 Integrated Air Compressor Inverter

Targeting the industrial production efficiency challenges faced by small and medium-sized enterprises (SMEs), ZONCN has launched the SP600 Series integrated inverters for air compressors.

This product effectively improves the operational efficiency of industrial production systems and offers significant advantages in energy saving.

Overview of Air Compressor

Apart from electric power, compressed air is the most widely used motive power source in industrial production. It also serves as a versatile process gas source and is extensively applied in many fields such as electric power, chemical industry and machinery manufacturing.

However, due to the high energy operating costs associated with air compressors, major enterprises have gradually adopted variable-frequency air compressors to improve operational efficiency. Compared with conventional direct‑drive air compressors, they can significantly enhance the overall system efficiency.

Meanwhile, with the rapid development of rare‑earth permanent magnet materials, permanent magnet synchronous motors (PMSMs) have also been rapidly and widely used in air compressors. With their high efficiency and energy‑saving characteristics, they have taken a large share in the compressor industry.

Next, let's take a look at the application case of the SP600 series VFD in a 7.5KW permanent magnet synchronous air compressor.

Air compressor operation process flow

Air Compressor Operating Process

1：Suction Stage: The air compressor has a pair of male and female rotors that rotate to complete air compression. Air is drawn into the clearance at the intake end through the suction port, and the male and female rotors get ready for compression. The suction process ends when the female rotor is fully filled with air along its entire length.

2：Compression Stage: The male rotor starts to mesh with the corresponding female rotor. Air is trapped when passing through the seal line, and the male rotor begins to compress the trapped air.

3：Discharge Stage: The squeezing motion of the male rotor gradually reduces the volume of the trapped air and pushes it to the discharge end simultaneously to complete the discharge.

Installation and configuration of SP600 on the air compressor

The upper computer of this equipment control system adopts a special controller for air compressors for PID closed-loop control. The touch screen and SP600 inverter in the system use Modbus communication method to achieve frequency adjustment, and simultaneously collect real-time online parameters such as inverter current, voltage, and power consumption.

Circuit diagram

The advantages of applying the SP600 in air compressors

1：It can ensure that the equipment operates smoothly throughout its operation, fully meeting all the requirements of the users.

2：It has excellent running capabilities and various protection functions. It can accurately learn the parameters of the motor, ensure its low-noise operation, and extend its service life.

3：While achieving rapid response of the system, it also ensures stable gas supply pressure.

4：It performs even better in terms of energy saving, and significantly reduces the size of the compressor, greatly saving installation space.