Shaft Grounding Rings Help University Improve HVAC Motor Sustainability
A preventive maintenance program at a leading New England Ivy League university demonstrates how the push for more sustainable building management has led to a growing awareness of a chronic, widespread problem for HVAC motors: electrical bearing damage.
Variable-frequency drives (VFDs), also known as inverters, are widely used because they save energy, especially in applications with variable torque loads. Because many centrifugal fans and pumps run continuously, their motors use less power if the speed is controlled by VFDs, rather than by using a damper for flow control.