A Look Inside the Variable Speed Compressor

What is a VSD

A variable speed compressor, also known as a VSD, automatically adjusts its motor speed to match the demand for compressed air in real time. Because of this advanced function and technology, they can often be more energy-efficient. With soft starts and overall lower operating speeds, there is reduced wear and tear on a variable speed compressor as compared to a fixed speed compressor.

The Power of an Inverter

The key element inside the variable speed compressor is the inverter, which is what automates the airflow process, variably as needed. The inverter adjusts the motor’s speed by changing the frequency of the electricity, so the compressor only works as hard as needed.

How Does an Inverter Work?

1. Converts AC power to DC power: Incoming power from the grid is in AC power, and the inverter works to turn this into DC power

2. Processes the DC power: Using electric circuitry, the inverter creates a controlled output frequency and voltage

3. Converts DC back to AC: This is the aspect that makes the variable speed compressor capable of variability. Now, the frequency and voltage are adjustable. The frequency is equivalent to motor speed; the faster the motor runs, the more compressed air is generated.

4. Control Motor Speed: By adjusting the frequency of the AC output, the inverter regulates the motor’s speed precisely. Now, the compressor can ramp up or down based on real-time demands.

Looking inside the VSD, we can see how the integral parts are laid out to make our FC VSD compressor series the powerhouse that it is. 

1. Permanent Magnet Motor
The permanent magnet motor (PMM) offers up to 10% extra efficiency in VSD compressors. With its compact size, low heat, and quiet operation, this motor style offers longevity and system optimisation. 

2. Cooling Fan 
Integrated cooling fans ensure these high-performance systems stay within thermal limits.

3. Inverter
Variable-speed Compressors use an inverter to adjust output based on demand, unlike fixed-speed models that run at full RPM at all times. This smart control can cut energy use by up to 50%, delivering only the air you need, when you need it.

4. Inverter Cooling System
The dedicated internal cooling system keeps the inverter’s sensitive electronics protected and performing at their best. By preventing overheating, it helps maximise efficiency and extend the life of the entire compressor.

Curious to know if a Variable Speed Compressor is the right machine for your operation? Reach out to us for a free consultation.