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Dry-type Oil-free Permanent Magnet Variable Speed Drive Rotary Screw Air Compressor

Rated Power: 45~315 kW Discharge Pressure: 0.75~1.05 MPa Free Air Delivery: 1.65~52.44 m³/min

Product Introduction

Dry-type Oil-free Permanent Magnet Variable Speed Drive Rotary Screw Air Compressor

Product Features

Low-pressure and high-pressure airends

The compressor features a large rotor and a low-speed design, incorporating two independent compression stages. It delivers high efficiency, low noise, minimal vibration, and exceptional reliability. With a small compression ratio per stage, leakage is reduced, and volumetric efficiency is enhanced. At the same power level, the load is shared by two airends, resulting in lower bearing loads and extended service life.

Intelligent Control System

The intelligent control system features comprehensive self-diagnosis, alarm functions, interlock shutdown, and monitoring capabilities, with the ability to log and store fault causes and component information. The unit’s control panel employs backlit LED displays and touch‑type buttons, offering full functionality and simple operation. Depending on user requirements, it can be configured for local, remote, or interlocked control modes. Standard equipment includes an RS‑485 interface that supports MODBUS RTU communication.

High-efficiency permanent-magnet variable-frequency drive

Standard equipment includes a high-frequency reactor, effectively reducing both the high-frequency emissions from the inverter and external magnetic field interference; it reliably lowers peak inrush current during startup, enabling smooth acceleration; and helps cut costs on power‑supply equipment. A specialized heat‑dissipation design prevents thermal shutdowns in summer’s high temperatures. Dust‑proof mesh is standard, and the circuit boards feature a surface coating that provides resistance to dirt, dust, and moisture. With a CAN‑bus standard protocol and hardware‑based wiring specifications, the system exhibits strong noise immunity. It rapidly tracks pressure changes, keeping pressure fluctuations within ±0.01 MPa, and leverages robust drive performance to deliver precisely the required air volume. Advanced integrated fan‑motor dual‑vector variable‑frequency control technology is also included.

Permanent magnet motor

The main motor is a high-efficiency, energy-saving permanent‑magnet motor with an IP55 protection rating, carefully selected to meet the specific requirements of the air compressor. It fully complies with national energy‑efficiency standards, features Class F insulation and Class B temperature rise, effectively prevents the ingress of dust and particulates, and is equipped with SKF heavy‑duty bearings to ensure long‑term, continuous, trouble‑free operation.

PLC programming controller

The PLC programmable controller has been rigorously tested in practical applications over several decades, offering strong anti-interference capabilities, reliable operation, a low failure rate, ease of use, and straightforward equipment expansion. It is simple to install, features self-diagnostic functions, and is easy to maintain.

Fan

Ultra-quiet, high‑airflow design; inverter‑controlled cooling fan with low pressure drop, low noise, and low power consumption; high heat‑transfer efficiency; centrifugal cooling fan—quiet and highly efficient.

Technical Specifications

Model No.	Rated Power	Discharge Pressure	Free Air Delivery (FAD)	Noise Level	Outlet Pipe Size	Unit Weight	Overall Dimensions LWH
Model No.	(kW)	(MPa)	(m³/min)	dB(A)	(EN)	(kg)	(mm)
WZG-45A/W0.75VD	45	0.75	2.12~7.07	73±3	R11/2	2630	210015001790
WZG-45A/W0.85VD		0.85	2.11~7.03	74±3
WZG-45A/W1.05VD		1.05	1.65~5.51	75±3
WZG-55A/W0.75VD	55	0.75	2.81~9.37	74±3	R11/2	2650	210015001790
WZG-55A/W0.85VD		0.85	2.8~9.34	75±3
WZG-55A/W1.05VD		1.05	2.43~8.11	76±3
WZG-75A/W0.75VD	75	0.75	3.81~12.72	74±3	DN50	2850	230016001790
WZG-75A/W0.85VD		0.85	3.81~12.69	75±3
WZG-75A/W1.05VD		1.05	3.47~11.58	76±3
WZG-90A/W0.75VD	90	0.75	4.1~13.66	75±3	DN50	2890	230016001790
WZG-90A/W0.85VD		0.85	4.09~13.64	76±3
WZG-90A/W1.05VD		1.05	3.79~12.64	77±3
WZG-110A/W0.75VD	110	0.75	5.75~19.16	75±3	DN65	3050	280018001860
WZG-110A/W0.85VD		0.85	5.74~19.13	76±3
WZG-110A/W1.05VD		1.05	5.01~16.72	77±3
WZG-132A/W0.75VD	132	0.75	6.79~22.63	76±3	DN65	3385	280018001860
WZG-132A/W0.85VD		0.85	6.78~22.6	77±3
WZG-132A/W1.05VD		1.05	6.09~20.28	78±3
WZG-160A/W0.75VD	160	0.75	8.22~27.4	76±3	DN65	3440	280018001860
WZG-160A/W0.85VD		0.85	8.21~27.38	77±3
WZG-160A/W1.05VD		1.05	7.19~23.98	78±3
WZG-185A/W0.75VD	185	0.75	9.11~30.37	77±3	DN65	3685	280018001860
WZG-185A/W0.85VD		0.85	9.1~30.34	78±3
WZG-185A/W1.05VD		1.05	8.2~27.34	79±3
WZG-200A/W0.75VD	200	0.75	10.25~34.17	77±3	DN100	4500	310021502200
WZG-200A/W0.85VD		0.85	10.24~34.14	78±3
WZG-200A/W1.05VD		1.05	9.16~30.55	79±3
WZG-220A/W0.75VD	220	0.75	11.01~36.71	78±3	DN100	4750	310021502200
WZG-220A/W0.85VD		0.85	11~36.66	79±3
WZG-220A/W1.05VD		1.05	10.21~34.03	80±3
WZG-250A/W0.75VD	250	0.75	13.11~43.71	78±3	DN100	4950	310021502200
WZG-250A/W0.85VD		0.85	13.1~43.66	79±3
WZG-250A/W1.05VD		1.05	11.75~39.16	80±3
WZG-280A/W0.75VD	280	0.75	14.3~47.65	79±3	DN100	5100	340024002200
WZG-280A/W0.85VD		0.85	14.28~47.61	80±3
WZG-280A/W1.05VD		1.05	13.07~43.58	81±3
WZG-315A/W0.75VD	315	0.75	15.73~52.44	79±3	DN100	5300	340024002200
WZG-315A/W0.85VD		0.85	15.72~52.4	80±3
WZG-315A/W1.05VD		1.05	14.26~47.53	81±3

Remarks:

1. In our model naming convention, WZG stands for dry-type oil-free; A/W, air-cooled/water-cooled; V, PM VSD; D, single-stage twin-screw.

2. Compressor volumetric flow is tested under loaded conditions complying with GB/T3853 (equivalent to ISO1217) and GB19153-2019.

3. Protection Class IP55, direct drive transmission. Standard power supply: 380V, 3-phase, 50Hz. Earthing is mandatory. For custom power supply, water-cooled units, units with different discharge pressures and other special requirements, please contact your sales representative.

4. Final dimensions refer to the latest official drawings. We reserve the right to revise product specifications without prior notification.

Features:

Oil-free operation, ensuring compliance with stringent cleanliness standards in industries such as food, pharmaceuticals, and semiconductors.

Applications:

Pharmaceutical manufacturing, deep processing of food and beverages, semiconductor chips and microelectronics, medical device production, dental and surgical operating rooms, high-end lithium‑ion battery production lines, optical instruments and precision optics, tobacco processing, premium cosmetics manufacturing, biological laboratories and testing facilities, as well as high‑end food blow‑molding for premium beverages.