The significance of inverter in permanent magnet variable frequency air compressor

With the development of science and technology, air compressors, as an important mechanical power equipment, are widely used in many industrial fields such as machinery, metallurgy, building materials, electricity, chemical industry, food, textile, etc. However, ordinary screw air compressors are high-energy consumption equipment, and in some industries, electricity consumption accounts for more than 30% of the total electricity consumption in production. The permanent magnet variable frequency air compressor has become a hot spot and highlight in the industry with its energy-saving and high efficiency. The original air compressors with high power consumption in the market have gradually been replaced by permanent magnet variable frequency air machines, which can directly save users 20%-40% of costs! Therefore, permanent magnet variable frequency air compressors have been rapidly and widely used in many industrial fields, and they have occupied a large share in the compression industry with their high efficiency and energy saving.

ENA inverter has been maturely applied in permanent magnet variable frequency air compressors. The transformation of permanent magnet variable frequency air compressors has achieved significant technical results, reducing the impact on the grid voltage during startup, improving the working efficiency of the air compressor, stabilizing the gas supply pressure, and significantly saving electricity. It has been widely used in the market. Next, we will introduce the application of ENA100 inverter in permanent magnet variable frequency air compressors in a certain equipment factory in Shaanxi.

Equipment Introduction

The full name of air compressor is air compressor. It is the main body of the air source device. It is a device that converts the mechanical energy of the motor into gas pressure energy and is a gas pressure generating device for compressed air. The basic structure is that a pair of mutually meshing spiral rotors are arranged in parallel in the body of the compressor; the rotor with convex teeth outside the pitch circle is usually called the male rotor or male screw, and the rotor with concave teeth inside the pitch circle is called the female rotor or female screw. Generally, the male rotor is connected to the prime mover, and the male rotor drives the female rotor to rotate. The last pair of bearings on the rotor realizes axial positioning and withstands the axial force in the compressor. The cylindrical roller bearings at both ends of the rotor enable the rotor to achieve radial positioning and withstand the radial force in the compressor. At both ends of the compressor body, orifices of a certain shape are opened respectively, one for suction, called the suction port, and the other for exhaust, called the exhaust port. The working cycle of the screw compressor can be divided into three main processes: suction, compression, and exhaust. As the rotor rotates, each pair of mutually meshing teeth completes the same working cycle one after another.

System Configuration

The site uses Energize ENA100 vector inverter to drive the permanent magnet synchronous variable frequency motor for screw air compressor, and communicates with a certain brand controller via 485 to form PID closed-loop control, and collects the inverter current, voltage, power and other parameters in real time online to meet the needs of equipment operation. The inverter wiring diagram and some parameter settings are as follows:

▽ Some parameter settings of the inverter

▽ Wiring Diagram

Application Advantages

The ENA100 inverter has excellent self-learning function, which can accurately learn various parameters of permanent magnet synchronous motors, ensure low-noise operation of the motor, and extend the service life of the equipment.

It has high-performance sensorless vector control, speed control accuracy can reach ±0.5%, torque response ≤20ms, achieving rapid response of the system and ensuring stable air supply pressure.

The ENA100 inverter can provide complete protection functions such as overcurrent, overvoltage, undervoltage, overload, etc., making the system operation more stable and reliable, and is deeply trusted by users.