Single Stage Vaiable Speed (PM VSD)

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Single Stage Permanent Magnetic Variable Speed Direct Drive Screw Air Compressor

Model: DHV-A/G Series; Brand: Dream

Rated Power: 7.5~55KW

Air Capacity: 0.2~10.6m³/min

Working Pressure: 0.8MPa

Product Features

■ IP65 oil-cooled permanent magnet synchronous motor is integrally connected with the air end, with high transmission efficiency and durability.

■ Double frequency conversion of air end and fan, which can save more than 30% energy than ordinary power frequency air compressor.

■ Compact structure, small machine and small footprint. Easy maintenance, maintenance can be done by opening the door.

■ Separation of hot and cold areas, air filter for air conditioning, cooling air inlet and compressor unit air inlet are independent of each other.

■ Multi-wing centrifugal fan, high wind pressure, fast heat dissipation, noise 20dBA lower than ordinary screw;

■ The product meets the national GB19153-2009 first-level energy efficiency standard.

■ The standard temperature control valve with the most classic sliding three-way structure can effectively avoid the change of discharge temperature. The mixed-flow structure is used to effectively prevent the phenomenon of starting oil temperature rising and the machine being stuck due to lack of oil when the machine is started.

■ Control and electrical system: can be set in Chinese / English bilingual, can realize the joint control of up to 16 machines and supporting post-processing.

■ The oil content of the air directly compressed by the compressor is less than or equal to 3PPM, and after being processed by the high-efficiency oil separator is not more than 0.01PPM, which is convenient for disassembly and assembly, and convenient for maintenance.

■ Regulated output, fluctuation range≤ ± 0.01Mpa.

■ High temperature shutdown protection.

■ Overpressure safety decompression system.



1. 7-inch touch screen, using imported TFT LCD display panel, using the latest LED backlight technology, screen resolution up to 480 * 800, there are multiple communication methods and multiple serial ports.

2. Double frequency conversion, constant voltage constant temperature control, higher efficiency, saving your maintenance costs.

3. Effectively monitor the temperature of the motor.

4. It has various air compressor protection functions such as phase loss, overload, unbalance, too high voltage and too low voltage.

Durable, efficient and stable air end

Durable, efficient and stable air end

1. The design idea of "large rotor, large bearing, low speed" is adopted to reduce noise and vibration and increase the life and stability of the host.

2. The tooth surface is processed by the German KAPP rotor grinder to create a high-precision rotor, which is the first guarantee of high efficiency and stability of the air end.

3. Adopt a new type of 5: 6 asymmetric rotor tooth shape, high-precision three-coordinate measuring machine for comprehensive measurement, increase the air capacity by 5% -10%

4. All imported quality bearings are used.

Permanent magnetic synchronous motor

Permanent magnetic synchronous motor

1. IP65 protection level, more stable and reliable than IP23 in harsh environments;

2. Oil-cooled design, use lubricating oil to cool the motor, the operating temperature of the motor is more stable, the life is longer, there is no motor axial fan, so there is no loss of energy efficiency of the axial fan;

3. Coaxial design with the main rotor of the air end, without coupling, loss of energy efficiency of the gearbox;

4. Using 38UH magnetic steel material, temperature resistance 180 ℃

Customized vector inverter

Customized vector inverter

1. Professional customization, perfect match with motor;

2. Fully monitor the parameters of the motor, including the motor temperature, to reduce the risk of the high temperature of the motor;

3. Independent air duct design, strong environmental adaptability;

4. Quick response, the response time is less than 50mS

5. Large low frequency torque, can output 180% rated torque;

Multi-wing centrifugal fan

Multi-wing centrifugal fan

1. The wind wheel is made by pressing the mechanical part, with strong structure and long service life.

2. Compared with axial fans, multi-wing centrifugal fans have higher wind pressure and less noise.

3. Due to high wind pressure, the cooler and filter are less likely to be blocked.

Three filters

Three filters

Air filter: the filter area exceeds 150% of the normal requirement, low the inlet pressure loss , and high energy efficiency ;

Oil filter: The design of the imported oil filter with enlarged glass fiber material is adopted. The rated processing capacity of the oil filter is ≥1.3 times of the circulating oil volume. The filtering accuracy is high and the durability is good.

Oil separator: imported glass fiber material oil core, good filtration effect, low oil core pressure loss.

Inlet valve

Inlet valve

Inlet valve: low flow speed test, low pressure loss, reduce energy consumption;

Minimum pressure check valve: low pressure loss, precise control, ultra-fast repositioning to ensure that the user's air does not return.

Temperature control valve: Mixed flow temperature control valve: The unit is equipped with a mixed flow temperature control valve to ensure that the unit is more convenient to start in a low temperature environment, and to ensure the unit is in the best performance state by controlling the oil supply temperature of the air end





  • 1. Material and life of permanent magnet motor


    The magnetic steel of the permanent magnet synchronous motor we use is neodymium iron boron permanent magnet material. Can be used for a long time under normal use

  • 2. Comparison of oil-cooled and air-cooled motors


    Oil-cooled motors use lubricating oil for cooling, which has high cooling efficiency and is less affected by ambient temperature. Air-cooled motors use cooling air for cooling.

  • 3. Can you work 24 hours a day?



  • 4. How many years can this machine be used?


    The design life of our unit is 30 years.

  • 5. In order to avoid frequent start and stop, what is the minimum pressure difference between loading and unloading, and what is the best pressure difference to maintain?


    Please refer to our manual.

  • 6. Is it possible to achieve constant pressure air supply?


    Variable frequency unit can realize constant pressure air supply

  • 7. What is the range of pressure fluctuations?


    The variable frequency unit can realize constant pressure air supply, and the industrial frequency unit can set the loading and unloading pressure according to the requirements

  • 8. Is the vibration big? Help me deal with it during installation


    The vibration value of the unit is less than the national standard value.

  • 9. Will it degauss in 3-5 years?


    The magnetic steel of the permanent magnet synchronous motor we use is neodymium iron boron permanent magnet material. Can be used for a long time under normal use

  • 10. The customer’s actual pressure is 8 bar. Can an 8 bar machine meet the requirements?


    Please refer to the catalog for the rated exhaust pressure of our corresponding models

  • 11. How big is the centrifugal fan? What’s the air volume? What brand?


    Regarding the cooling air volume, please check our model parameter table

  • 12. Whether the air compressor has an explosion-proof certificate (Yibin coal mine customer)


    For special models, please consult our sales manager.

  • 13. Is the equipment air-cooled or water-cooled


    We can produce both air-cooled and water-cooled models. Please consult our sales manager for specific product information.

  • 14. Motor cooling method


    Depending on the model, there are air-cooled motors and oil-cooled motors.

  • 15. Is the motor an energy efficiency IE4 motor?


    The energy efficiency of permanent magnet motors reaches IE4 level.

  • 16. Cases in the industry and region


    Please check Dream official website

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For more than a decade, Dream (Shanghai) Compressor Co., Ltd has been striving to become one of the leading manufacturers of compressed air solutions in China.

Contact Us

Mob.: +86-15800579721


WhatsApp: +86-15800579721

Add.: No.30 Caoli Road, Jinshan District, Shanghai, China