3 Phase Motors – The Basics
Fundamentally, three-phase, alternating current motors are about as simple as a motor gets. The power company produces three phases by spinning magnets and then on the other end we produce electromagnets that spin the motor according to the same 60 cycles per seconds frequency (60hz). All three-phases are 120-degrees out of phase from one another […]
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Removing a Blower Motor
I’ve seen a lot of guys recently who reach for the motor puller tool first thing when attempting to remove a blower motor from a wheel/fan blade. Motor puller tools are an awesome backup tool when needed, but that shouldn’t be the go-to method of removing a motor.   The main issue with using a […]
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Aftermarket Motor Selection & Considerations
This article was written by technician and HVAC School community star Kenneth Casebier. Thanks, Kenneth! When looking at replacing a single-phase A/C motor with an aftermarket motor from your van, there are a few things you should know and pay attention to. First, the factory OEM motor will always be the best option, especially when […]
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Motor Service Factor
“Service factor” is an interesting motor rating that you will see on many motor data tags. It simply means how much additional “work” a motor can do or how much “load” it may be placed under for short periods of time without failure or overload. For example, the FLA or full load amps of the […]
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Why Many Techs Confuse Overload, Short & Ground Fault
The point of this article is to give you a full understanding of the role fuses, overloads, and circuit breakers play in the protection of HVAC/R equipment. If you skim read or jump to conclusions, you will be tempted to argue. Be patient; if you want to understand, you will need to read all the […]
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Can A Motor Run Backwards by Swapping Run & Start?
Can a single-phase motor run backward when start and run are swapped? The answer is (generally) yes. Is the motor designed to run backward by simply swapping run and start? The answer is (generally) no, with a few notable exceptions. Before we jump in, this article has two purposes. #1 – it helps you understand […]
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