Arkansas HVACR NewsMagazine January 2021

S tate, National, Chapter News Tech News

3 PHASE MOTORS – THE BASICS BRYAN ORR

Let’s look at some of the things to consider about three-phase motors.

All the obvious things..

The motor needs to be a physical size that fits, it needs to be the correct voltage and it needs to be rated to do the job it is doing. You can’t put in a motor with a horsepower/wattage/current rating that is too small but you may… on occasion use one that is larger than the rating so long as it fits and the conductors/overloads etc… are appropriately sized.

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 and work really well at turning a motor.

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