Forward and reverse motor

[SuzukiGS750EZ]

Is there a way I can wire a switch to forward and reverse on demand an AC motor? Currently the only way to do so is to flick the on/off switch until it does it or hold the motor until it freezes and reverses.

 

[dogdog]

If your 1PH motor is revers-able... then it's just a DPDT switch to select the reverse... plus the ON-OFF switch. it's pretty simple, dependents if you are doing 120V or 240v setup.. would be a bit different in wiring but still...

Or you can look up those Drum switch..

Both are not quite instant, but can be consistence. You will still have to wait for motor to stop. Unless your motor accepts some sort of magnetic brakes like those industrial motors...

I did my drill press with the DPDT, and the on-off switch.. the reverse/forward is the DPDT ... it only matters where the position of the switch is press at the time it on button is press, Since the centrifugal switch disconnects the start coil after it goes up to speed... unless you have a third hand to flip fwd and revers while it is starting that is a different story...


Not too sure about the 3PH motors...

 

[marinusdees]

Instant reversing motors can be had for a price. They have a special centrifugal switch, I can't remember the details, Google it.
Electric chain hoist motors are instant reversing. And can be had single phase.

 

[Innovate1]

Is there a way I can wire a switch to forward and reverse on demand an AC motor? Currently the only way to do so is to flick the on/off switch until it does it or hold the motor until it freezes and reverses.

It sounds like the direction currently is random. Some very small motors have a ratchet type device that only lets the motor turn in one direction to get uniform direction. Need more information on the motor and situation...

 

[hermetic]

In a single piase motor, direction is controlled by the start winding, you need to reverse the polarity of the start winding to start the motor in the other direction. If your motor has the ends of the start winding brought into the connector block on the motor, first job is to identify them, look for Z1 and Z2, or the winding that goes through the centrifugal switch, once you have identified the ends of the start winding, you need a switching set up which swaps them over. Unfrtunaltely some motors do not bring the connection for one end of the start winding into the terminal block, it is buried in the motor windings as a common connection, usually connected to neutral. This type of motor is difficult to reverse, maybe not even worth the bother! If your motor can be mada to reverse by multiple on off switching, there is a fault somewhere!
Phil,
UK

 

[wyliesdiesels]

Is this a single phase or 3ph motor?

 

[marinusdees]

I have an instant reverse single phase motor virtually new I bought years ago to put on my lathe. I used it about a month before I determined I didn't like/need it so it sits on the shelf. If you're close, it can be for sale. I can take pix.

 

[dogdog]

I have an instant reverse single phase motor virtually new I bought years ago to put on my lathe. I used it about a month before I determined I didn't like/need it so it sits on the shelf. If you're close, it can be for sale. I can take pix.

What is an instant reverse single phase motor... curious.

even the motor on the HF electric hoist is not instant reverse (no exp with other hoists), if you took the motor out the gear box, it is just an regular AC motor wired to the DPDT center off..

 

[marinusdees]

Electric motors on industrial or heavy duty electric chain hoists have special centrifugal (start) switches allowing instant reverse as a safety factor. A device called a SinPac allows the same function electronically. Google it, or find an electric motor repair shop and buy the repairman a 6 pack or whatever. As far as I know, and that isn't far, a SinPac can be fitted to any single phase motor IF the run winding leads and the start winding leads are all brought out.
The instant reverse motor I have on the shelf has a special centrifugal (start) switch. Once upon a time, I had my brain wrapped around the specifics of how they work. I don't work with motors enough to keep this info in my at hand data system.

 

[SuzukiGS750EZ]

This motor is a cheapie off Amazon used to spin cups (my ladies hobby). When she's making them she likes them to turn clockwise, when she dries them she wants them to go counter because of the threads loosening.

 

[dogdog]

you'll going to have take a pic of the data plate or find out exactly what type of 1PH AC motor it is... traditional AC induction motor is easy.

 

[dogdog]

Electric motors on industrial or heavy duty electric chain hoists have special centrifugal (start) switches allowing instant reverse as a safety factor. A device called a SinPac allows the same function electronically. Google it, or find an electric motor repair shop and buy the repairman a 6 pack or whatever. As far as I know, and that isn't far, a SinPac can be fitted to any single phase motor IF the run winding leads and the start winding leads are all brought out.
The instant reverse motor I have on the shelf has a special centrifugal (start) switch. Once upon a time, I had my brain wrapped around the specifics of how they work. I don't work with motors enough to keep this info in my at hand data system.

you are referring to these electronic centrifugal switches ?


this one is informative..

 

[marinusdees]

I am referring to Sin Pacs. Sorry.

 

[dogdog]

I am referring to Sin Pacs. Sorry.

you know they are the same thing. ? Just brand are different.

https://www.stearnsbrakes.com/products/electronic-start-switches/sinpac/2cv

 

[SuzukiGS750EZ]

https://www.amazon.com/dp/B07TFDPZP7/?tag=atomicindus08-20

 

[dogdog]

dunno anything about those syncho motors... but I swear I saw a thread about these here few months ago... That guy also have a wife that use it for something similar as you.

 

[marinusdees]

you know they are the same thing. ? Just brand are different.

https://www.stearnsbrakes.com/products/electronic-start-switches/sinpac/2cv

A rose by any other name.........

 

[marinusdees]

you are referring to these electronic centrifugal switches ?


this one is informative..

There is a way to instantly reverse single phase electric motors using a special centrifugal starting switch which is not electronic. It allows the leads to be reversed while the motor is running, unlike conventional start switches. I think it is not possible to retrofit an existing motor with such a switch, but I am not a motor winder. Nor do I claim to be an expert. Just trying to supply an answer to a question. I think these switches predate electronic switches.

 

[dogdog]

There is a way to instantly reverse single phase electric motors using a special centrifugal starting switch which is not electronic. It allows the leads to be reversed while the motor is running, unlike conventional start switches. I think it is not possible to retrofit an existing motor with such a switch, but I am not a motor winder. Nor do I claim to be an expert. Just trying to supply an answer to a question. I think these switches predate electronic switches.

I think you might be referring to the drum switches.. aka TPDT center off I think...maybe I took the word "instant" literally... all those electronic or mechanical still have to wait for the rotation to some what stopped. before reversing. sort of. I just know the DP have the pulleys to stop it, if I don't let it stop first, it's harder on the coils... the HF hoist have the gearing system, the industrial motors 2HP one I have . have a magnetic braking system build in to instant stop it.

But anyways for OP's AC 1PH Syncho motor... I don't think there is an answer... maybe by mechanical means with two one way gear like the bicycle cartridge... stack in two on for each way to select the rotation. Easiest and cheapest would be just replace it with a small DC gear motor and a PWM controller for cheap... $20 probably all in. and still maintain the select-able rotation / speed.


But anyways, I swear I have seen this thread before few months or a year back...

 

[grounded-b]

Reversing a motor, while it is still turning, is called "plugging".

Plugging a motor is very hard on the contacts of the switch being used, because of the arcing.

Steve