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Tool Talk Discussion Forum

reversing rotation on electric motors.

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Mike(NEOhio)

09-15-2020 07:33:34




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I scrapped the motor from my cummins-mack drill press, mice nested in it and chewed the field windings. Put the motor from the C-M bandsaw on but it's the opposite rotation. 3/4 Hp four pole capacitor. Can the direction be reversed?




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wore out

09-16-2020 07:35:27




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 Re: reversing rotation on electric motors. in reply to Mike(NEOhio), 09-15-2020 07:33:34  
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You missed my point completely.

A common motor with a centrifugal start switch and a simple reversing switch WILL NOT reverse if the switch is flipped when the motor is "at speed".

So "reverse your spinning motors any time you want to" does not apply, as it's impossible.

On the other hand, there are specialty motors available that are called "instant reversing" and WILL reverse instantly, "at speed" and survive such treatment day in and day out.

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miangus

09-16-2020 07:53:39




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 Re: reversing rotation on electric motors. in reply to wore out, 09-16-2020 07:35:27  
The motor on my drill press, a line shaft conversion can be reversed by loosening a bolt and adjusting the brush position. The Patent date is 1921. Many of my friends have laughed at the old flat belt driven antique. The laughing usually stopped when they needed a 3/4' hole drilled in 3/4 inch plate.



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John T

09-16-2020 09:39:58




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 Re: reversing rotation on electric motors. in reply to miangus, 09-16-2020 07:53:39  
That brush type Repulsion motor IS NOT the same as an Induction motor so reversing is a different process. Brush repulsion motors have good starting torque. Years back I saw some Repulsion Start Induction Run and wow those would start a ferris wheel lol

John T



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John T

09-16-2020 05:10:02




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 Re: reversing rotation on electric motors. in reply to Mike(NEOhio), 09-15-2020 07:33:34  
A typical single phase split phase motor uses a separate "start" winding which gets it spinning in a certain direction and at X RPM a centrifugal switch opens (is closed initially) and the "run" winding alone continues to operate. To reverse direction the leads on that "start" winding get reversed. One problem is the centrifugal switch contacts get burned pitted carboned and resistive or maybe they stick closed.

John T

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Stephen Newell

09-16-2020 05:09:27




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 Re: reversing rotation on electric motors. in reply to Mike(NEOhio), 09-15-2020 07:33:34  
Not all motors are reversible. There should be information on the motor on a plate which tells how to reverse the motor if it's the kind.



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wore out

09-15-2020 20:56:44




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 Re: reversing rotation on electric motors. in reply to Mike(NEOhio), 09-15-2020 07:33:34  
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"Just don't throw that switch while the motor is running, it's really hard on the motor."

Who told you that?

Reality is that if you quickly flip the reversing switch and the motor stays above the speed the centrifugal start switch kicks in NOTHING will happen, no reverse, no motor destruction, NOTHING, it will not reverse.

If the reversing switch has a "center off", and you dally a little 'til the motor speed has coasted down enough to kick in the start windings it will simply reverse without any major destruction.

If the motor is on a lathe reversing just before a stop MAY loosen or completely spin off the chuck, still no motor destruction, though!

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Red Dave

09-16-2020 06:23:35




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 Re: reversing rotation on electric motors. in reply to wore out, 09-15-2020 20:56:44  
Well then please, by all means, reverse your spinning motors any time you want to.


Let mine alone, thank you.



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Mike(NEOhio)

09-15-2020 16:42:34




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 Re: reversing rotation on electric motors. in reply to Mike(NEOhio), 09-15-2020 07:33:34  
OK, this is one of those cheap chinese motors. I'll look into it tomorrow.



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Dusty MI

09-15-2020 09:39:09




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 Re: reversing rotation on electric motors. in reply to Mike(NEOhio), 09-15-2020 07:33:34  
Look at the inside of the terminal cover, usually theres a wiring diagram there.



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Red Dave

09-15-2020 10:47:53




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 Re: reversing rotation on electric motors. in reply to Dusty MI, 09-15-2020 09:39:09  
"Look at the inside of the terminal cover, usually theres a wiring diagram there."

Correct.

I've also made my drill press reversible and there was no wiring diagram under the cover.

I googled the connections diagram for the make and model of the motor. It showed the connections for either rotation. A DPDT switch later and now my drill press is reversible. Just don't throw that switch while the motor is running, it's really hard on the motor.

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4520bw

09-15-2020 08:21:31




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 Re: reversing rotation on electric motors. in reply to Mike(NEOhio), 09-15-2020 07:33:34  
Most single phase you just switch the wires that go to #5 and #8 wire.



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Russ from MN

09-15-2020 07:48:02




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 Re: reversing rotation on electric motors. in reply to Mike(NEOhio), 09-15-2020 07:33:34  
Most electric motors can be easily revered, many have instructions inside the terminal cover. The one exception is water pump motors, if they were to start in the CC direction it might unscrew the impeller, as many just screw on. But, if your determined enough, it can be done. I pulled a 1 hp pump motor out of the dumpster at work once, but it ran the wrong direction for my air compressor. I had an electrician look at it, he said "no, it can't be reversed" I mentioned that to a fellow millwright who was an exceptional thinker, and he said, "why don't you turn the stator around"! So, I did that, and it's been running my air compressor for 25 years!

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dr sportster

09-15-2020 07:46:07




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 Re: reversing rotation on electric motors. in reply to Mike(NEOhio), 09-15-2020 07:33:34  
Reverse polarity on the start windings . If you can get the leads



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dr sportster

09-15-2020 07:42:12




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 Re: reversing rotation on electric motors. in reply to Mike(NEOhio), 09-15-2020 07:33:34  
It depends if the motor lets you have long enough leads to make the switch. Some are not reversable.



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