Electric motor direction change

CBBC · Jan 22, 2015

This 2hp Compressor motor works well. I want to replace the motor on my table saw, but it is running the wrong direction.

I've never had trouble with this, there is usually a diagram explaining which wire to change. Not so in this case. Were these motors non reversable? It doesnt say anything about that anywhere???

Any suggestions would be appreciated.
Thanks, Grant

Dick2 · Jan 22, 2015

Is there a cover on the end of the motor? Somtimes there is a wiring diagram on the inside of that cover.

CBBC · Jan 22, 2015

I'll check, but dont think so...I know where you mean, seen that before.

old · Jan 22, 2015

There are in fact some motors that can not be reversed

Bob · Jan 22, 2015

It appears it CANNOT be reversed, at least not without getting inside.

If it can be figured out which are the start winding wires, and they are attached (probably soldered) to the back of the terminal board, they can be swapped there.

Dick2 · Jan 22, 2015

Are you going to hook the motor to low voltage or high voltage?

I've been looking at the information on the date plate but can't read it that good; I'm not sure, but it looks like wires #12 and number #13 may be the starting winding leads. Switching those may change the rotation, but I'm not sure. Might have to do a trial-and-error thing to see if that works.

CBBC · Jan 22, 2015

Its high voltage right now...may be more practical for low voltage so I can move it around...

It says T2 and T3 not 12 and 13, but that doesn't really matter. I could try switching...but maybe it just isn't the motor for this application without re mounting it ;>(

Three phase motors are so easy. I'll try and switch those two T's tomorrow.

Thanks all. Grant

Dalex · Jan 22, 2015

I've got a Non reveresable one on my Speedaire

Bob · Jan 22, 2015

"Might have to do a trial-and-error thing to see if that works."

Usually NOT well with connecting motors.

The smoke gets let out AWFUL quick if the wrong connection is made.

I am so meticulous about that, but a couple of years ago I didn't double-check how I connected a furnace fan motor, and it was TOAST in far less time than it has taken me to type this.

Paul Janke · Jan 23, 2015

I had a non-reversible motor from a drill press I wanted to use on a bandsaw which ran the other direction. I took the motor apart and put the rotating parts back in the opposite direction. The shaft is now sticking out the other end. It works great.

CBBC · Jan 23, 2015

Interesting. It was a free motor, maybe I'll take a look at that...or just stick it back on my shelf for the day the a compressor motor craps out.

I have a couple 1750 rpm 1-1/2 reversible motors kicking around. It might just be easier to put a bigger pulley on the motor to get my blade speed.

Thanks for the suggestions, Grant

Electric motor direction change

CBBC

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Dick2

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old

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Bob

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Paul Janke

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