Applying Motor Temperature Ratings

By: Stephen Horne

Motor temperature ratings are given by the type of insulation used on the wire as well as the utilization rate. These two parameters determine the expected lifetime of the motor windings.

The vast majority of motors used today are rated for 40 °C. These motors utilize Class F insulation with a Class B temperature rise (the utilization rate). Occasionally, you will encounter a Class H motor rated for 45 °C or 50 °C. So what is the difference between these two classes and what are benefits of one over the other? And what on earth do motor temperature ratings have to do with rabbits? Continue reading “Applying Motor Temperature Ratings”

Get Your Motor Running

By: Stephen Horne

There are four major starting methods for motors. Since compressor and blower manufacturers use any number of these starting methods—some may come standard, some may be an option with a price adder—it’s important to understand the differences between them. Understanding these differences can be helpful when comparing equipment that utilizes different starting methods. Continue reading “Get Your Motor Running”