Variable Speed

THE ADVANTAGES OF A VARIABLE SPEED DRIVE 

Variable Speed Drive air compressors, also known as VSDs, are rotary screw compressors where the motor operates at different frequencies depending on the demand that is being placed on the compressor. These compressors alter the motor’s RPM to match the required CFM.

Energy Efficiency

Energy consumption reflects demand. The higher the compressor’s demand, the more energy is used, and the lower the demand, the less energy is used as the motor’s RPM is ramped up or down to match. 

Due to the motors’ efficacy, this can reduce energy costs by over 50%, making this change a worthy investment in the long run. The energy savings almost erase those initial costs.

When it comes to the drivetrain of the motor on the VSD, it is directly connected to the screw elements, which allows for the motor to be completely shut off when it is not used rather than having to sit in idling and draining power. 

This ability to partially shutdown and restart on demand is due in part to the “soft start” of these motors as the RPM just increases to the point that is needed, so as the motors ramp up, the energy level does as well, which reduces the energy spikes, unlike fixed speed which need large amounts of energy to start.

Increased System Life & Energy Incentives

These compressors benefit both parties as the energy consumption is reduced for the individual using the variable speed drive air compressor, and the power companies benefit from the reduced grid strain and decrease in energy spikes that can potentially cause power outages.

Working within such a tight pressure window allows the system to operate at a lower delivery pressure and reach a consistent pressure. This consistency also allows for an overall increase in production due to achieving higher production levels, reducing mistakes due to inconsistent air pressure, and smoother overall operations.

These benefits can extend beyond the direct savings you get from improved energy efficiency. Still, some power companies will even provide you with credit for using the most energy-efficient equipment. If the savings alone aren’t enough to convince you of the value of a VSD, maybe getting credit toward your energy will add to that.

The Short of the Variable Speed Air Compressor Benefits

There are many benefits to switching to a Variable Speed Air Compressor, but we want to keep it short and sweet as to why they are the best option:

• Because the VSD compressor only runs when needed, it reduces energy costs—typically enough to pay for the additional investment in VSD technology.
• A variable-speed drive air compressor can start/stop under full system pressure. There is no need to unload, which saves both time and energy.
• No time is lost to idling.
• No blow-off losses occur in everyday operations.
• Power company penalties for peak current at startup are avoided.
• Air system pressure is more consistent and also lower, minimizing leakage.