VSD
The main difference between fixed speed and Variable Speed Drive (VSD) rotary screw air compressors is the way the motor is controlled. Fixed speed compressors run at one fixed speed and are very efficient when operating fully on load 100% of the time, when the motor is running and compressed air is being produced. The inefficiency comes when the unit unloads (stops making air). Although eventually the compressor will stop, it spends some of the time turning the motor and using energy whilst not actually producing anything, and therefore wasting energy. A VSD compressor automatically adjusts its motor speed to the air demand, ensuring it runs no faster than necessary.
Benefits:
ENERGY SAVINGS. Variable frequency can very efficiently maintain steady discharge pressure in widely varying loads, thereby reducing power cost.
REDUCING POWER SURGES from ‘soft starting’ motors, eliminating high inrush currents.
Delivering a more CONSTANT PRESSURE.
Permanent Magnet

Silent and reliable, Permanent Magnet ("PM") motor, instead of the traditional induction motor, offer excellent performance without inadvertently damaging compressors, leading to less wear and longer system lifespan.
Benefits:
Non-contact magnetic bearings are used to hold the motor shaft in place, so there is less vibration and no friction between the components, resulting in LESS WEAR.
INCREASE Energy Eefficiency – reduce electrical power consumption and costs.

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