Gardner Denver 90-160kw Screw Air Compressor

Permanent Magnetic (PM) Variable Speed Drive(VSD) Motor

Gardner Denver PM VSD series air compressors are driven by PMsynchronous motor. Compared to conventional electrically-excitedmotor, PM motor, especially rare earth PM motor, is featured bysuch significant advantages as simple structure, reliable operation,small size, light weight, low loss, high efficiency and a great varietyof shapes and sizes, and thus has an extremely wide scope ofapplication in aerospace & defense, industrial & agriculturalproduction and almost all fields of daily life.

lE5 superior energy efficiency and high reliability

IP66 protection level

Large -sized bearings ensure the service life

The air compressor driven by PM synchronous motor is superior to that driven by ordinaryfixed speed motor mainly in the following aspects:

Superior Motor Performance

The hybrid permanent magnet (HPM) motor is mainlyfeatured by its stator winds, which are detachable andfield-replaceable, and can drive by directly connectingwith the male rotor of the airend due to the small sizeand high power (with 33% smaller volume to delivermagnetic flux up to 3 times of the conventional VSDmotor). Besides, the unique motor layout eliminatesany wear parts and bearings, and achieves no rotorexcitation loss and 5-10% higher efficiency.

Low Noise

Rational slot-pole combination and magnetic fielddesign ensures wider operating frequency and lowe!operating noise.

Wide Range of Frequency Conversion

The motor can achieve VSD range of25%-150%(vs 50%-100% of asynchronous VSD motor) due to its superiorlow speed performance without electricallyexcited rotor and adoption of advancedself-sensing vector control technique.Therefore, it can operate with no load atlower rotational speed to save energy.

Enlarged Motor Air Gap

The enlarged air gap enables HPM motorto run normally in a more stringentenvironment with minimum downtime.

Unlimited Start / Stop

Due to its unlimited start / stopcapability, HPM motor can meet the aircapacity requirement without causingany damages as a conventional motordoes. When the air capacity of the unitdrops to the lowest point, it will stop toprevent a waste of energy for unloadingof conventional air compressor.

Compact Structure, Small Size& Light Weight

PM rotor has a small size and highpower density.

High Efficiency Fixed Speed Motor

Gardner Denver fixed speed series air compressors are driven by three-phaseasynchronous motor, which is directly coupled with the gear and has lE3 superiorenergy efficiency as perlEC60034-30.

The main motor is elaborately selected for specific applications of the aircompressor. The torque and load of the motor conforms to the special designstandard for an optimization of efficiency and power coefficient under load by!approximately 5% over other motors.

Motor Frame

The motor frame and end cover made of cast iron and cast aluminum can support thebearings more firmly, maintain a uniform gap between rotor and stator and make its flangecoupled components permanently parallel.

Electrical Design

The rotational speed, torque and other operating parameters are designed to meet the loadrequirements of the compressor. The air capacity requirement of GDK series compressorscan be met by the already optimal efficiency and power coefficient of the motor.

Bearing

As a powerful guarantee for smooth operation, the air compressors are fitted with vacuumexhaust bearings at the drive end and roller bearings at the discharge end, which can belubricated by the coolant flowing through the bearing grooves. These oversized bearingshave an average service life of 135,000 hours, 8 times longer than NEMA standard.

Insulation Materials

The high efficiency motor of GDK series with Class F insulation and Class B temperaturerise is rated for 155 C ambient temperature under continuous load, which delivers highreliability, longer service life and better adaptability to severe environment of the motor, astemperature is so critical to the service life of an engine.

Protection Rating

The highly efficient GDK series motors are of closed type with a protection rating at lP 55.which effectively protects it against dust and moisture and guarantees the smoothoperation even in a harsh environment.

Airend

As the core part of screw air compressor, the airend is designed to minimize manufacture deviation and enable accurate installation with itsreliable quality, stable performance and high operating efficiency. Besides, some other components in the air compressor provide citical supportand control for reliable operation of the airend. The newly designed airend with over 10% higher average energy efficiency is used inGDK90-160 series for long-term reliable operation

1、The lubricating points are deliberately arranged to precisely deliverthe lubricant to the required position effectively for higherreliability and lower energy consumption.

2、Advanced gear design enables more efficient and reliable transferof drive energy

3、Integrated gearbox reduces windage loss and drive system lengthfor higher efficiency & performance and easier maintenance

4、Enhanced bearing arrangement helps reduce the resistance andimprove energy management for higher reliability and performance

5、The drive system is sealed to protect it against dust and moisturewith no need of reqular maintenance

6、The optimized screw rotor profile significantly improves energyefficiency and air capacity, and reduces energy cost

7、Low friction bearing arrangement improves the energy efficiency!

8、Gear lubrication is optimized to deverly inject the lubricant intothe gear engaged position for higher operating reliability andlower energy consumption

9、Streamlined inlet and outlet passage reduces pressure drop

10、The oil spraying process is optimized for lower temperatureand higher efficiency during the compression process

Type of Drive

The motor and airend of GDk PM VSD series products uses a coaxial direct-coupled drive system to be more efficientreliable and robust, where coaxial drive reduces mechanical loss of belt gear and other devices, and coaxial connectioldelivers higher driving efficiency. lt also maintains permanent concentricity and air-tight seal of the base to preventintrusion of foreign materials in the air and ensure smooth power transmission.

High-efficiency Cold Air Intake System

Inlet Filter

The inlet filter, which is 99.5% efficient at 3um and above, is directly connected to an inletvalve for simpler replacement; the inlet valve integrated with a solenoid valve reduces pipeconnections & leak points and lowers inlet air resistance for higher intake & compressionefficiency.

High-efficiency nano membrane air filter element has a 0.3um particle filtrationperformance over three times higher than ordinary filter.

Independent Cold Air intake Channel

The new independent cold air intake channel design of GDK with low intake temperature, greater aircapacity and less pressure drop significantly improves the airend efficiency. lt reduces exhaust temperatureof the entire system, extends service life of pipelines, and greatly improves the cooler performance.