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projectjohn 08-21-2006 07:45 PM

electric winch
 
Help me out please I'm in the process of building a electric winch to pull cars in and out of the garage. I have one problem. The motor i'm using is 110V 1/2 horse 1725 rpm and right now it turns clockwise, that is good but it only goes one way. I need to make something up that will make the motor turn clockwise and counter clockwise. I have switched the leads with out success, so i think it is something more.

This has been some what of a stumbling block for me. So any help would be good.

If this is not in the right section please move it because I'm not to sure if this is the right place.

Thanks

John

pepi 08-21-2006 07:59 PM

you have two problems, first that winch would need a reverse switch (problem number one) and second that AC motor would need the field wired in such a way as to enable the motor to run in the opposite direction (problem number two), to make a long story short it will not work as planed. Only a DC motor would change direction by reversing the polarity.....

projectjohn 08-21-2006 08:34 PM

OK switch can be delt with.

The motor that I'm planing to use has on the case externally reversible, but no other information.

Thanks for the help

John

weirdbeard 08-21-2006 08:52 PM

You could just get a cheap HF bumper mounted winch for off roading. 12volts DC Much easier. $30? Umm.. Now that I think about it your AC drill will reverse so maybe I should stop right now before I show my lack of knowledge.

pepi 08-21-2006 08:52 PM

Quote:

Originally Posted by projectjohn
OK switch can be delt with.

The motor that I'm planing to use has on the case externally reversible, but no other information.

Thanks for the help

John

I believe that might mean use a switch in electric motor language or some sort of motor control : example relay or a solid state devices. Sounds like you are on the right track and just need a wiring digram. I do not have that but am betting that will not be hard to come up with

docvette 08-21-2006 09:07 PM

Doc here, :pimp:

Is it a GEAR reduction motor (Motor and Transmission) , or a straight motor?

Pull the Makeup box cover, (where the wires hook up) and see if there is a data plate there and winding jumper orientation diagram.

Maybe snap a pix of it and post here.

Doc :pimp:

projectjohn 08-21-2006 09:46 PM

1 Attachment(s)
I'll snap some pictures of the motor, but that won't be till tomorrow.

The motor is just that a motor. It is like a motor from a furness that turns the squirrel cage fan. (If thats any help) except a bit more power.

What i have put together is a motor that speed is reduced about 7-1 with pulleys. Then from there it goes to a gear box that is 38 to 1 then from that output shaft goes to a spool for the cable. So that works out with a motor spinning at 1725 to have final speed of 6.5 RPM. With my final calculations it should pull at about 36" a min. I have seen many of these things built that work excellent, but I have never checked out too close the wiring of the motor.

The styles of switches I have seen 2 setups with basic light switches ( one for on-off, one for clockwise - counter clockwise) and then I have seen some setup with a proper switch. I don't care what system, but would prefer the light switch set up because of cost ( I have more of those laying around from renovations)

No info under the plate it's either gone or never exisited, but the good thing is I have about 3 motors to chose from, but the same thing on all.

Just to say one reason for not going with a 12 volt winch is that I'm looking at about 100 feet of 1/4 inch cable so they don't have the capacity. And I don't like the idea of battery power. I have a unlimited supply of 110 always ready to go, but with batteries that is not always the case.

Thanks for the help so far

John

Atached is a picture to help convay my plan

ElegantInventor 08-24-2006 09:44 AM

electric winch
 
John,

Some AC motors that run on 110 volts can be reversed, like Doc said.

Reversing is accomplished by swapping around the field coils, and which ends of the coils get AC power connnected to them.

These coil connections are normally inside the protective power feed box built on the motor chassis. Some motors use terminal strips, others use bare wires held together with wire nuts, and some use spade lugs.

If you can get a brand name and model number off your motors, it should be possible to find the connection diagram for it on the internet. If you have a motor that is reversible, then a diagram of how to wire the motor to an external reversing circuit should be possible.

Note, I have some AC motors (like the one on my small air compressor) that cannot be reversed, but can be wired to run on either 110 or 220 volts. Connection-wise, it looks about the same as a reversible motor. On the outside of the motor is an information plate, and it has a very-hard-to-understand diagram of how to rewire the connections.

I have an AC motor on my lathe that reverses. It does not have 220 volt capability, but has the same number of wires as my compressor motor, and a really bad wiring diagram.

Maybe this helps?

Jon P

jimfulco 08-25-2006 11:00 PM

What about turning the motor around?

home brew 08-25-2006 11:22 PM

We built a winch like yours with a reversible motor and switch (we had a pretty good wiring diagrams to go by - both for the motor and the switch) with the gear box to reduce the speed. If you give these guys a pic of where your power attaches they will be able to help you.

powerrodsmike 08-26-2006 12:35 AM

If that is a 1/2 horse blower motor from a furnace it may not live too long trying to start under a load.

Winches are usually considered loaded starts, as opposed to a fan , which has a minimal load when it starts. They put capacitors on mtors to start them under a load. Did you ever notice the 2 or 3 capacitors on a compressor motor? and the 1 or even none on a fan type motor?

You may be able to get that 1/2 horse motor to run if you can somehow start it with out a load.

I have an old induction start motor on my 1938 craftsman table saw. It is externally reversable by loosening up the end plate and rotating it about 15 degrees . There are marks that say CC, (counter clockwise) and CW (clockwise)

Most motors these days are reversed by swapping leads inside the junction box on the motor. I think the current flow through the fields are wired in a different order to reverse.

Later, mikey

larryblack 08-26-2006 04:12 PM

Single phase electric motors has a start winding built into them. They can be capacitive or inductive in nature. You reverse the start winding leads with respect to the stator windings. Stator windings are the wires you see when you look into a motor.

Usually motors that can be reversed have the connection diagram on the case or hidden under the cover where the wires are connected.

If the motor has a pulley system on it, it probably will start OK provided it is a speed reducer.

projectjohn 08-30-2006 10:38 PM

Sorry for the long time with no reply, but my computer decided to drop dead for the last 5 days.

Thanks for the info.

These motors i have are not fan motors, but they are like fan motors. I don't care that much if they get burnt up because the price was right. Free.

Larryback could you explain that a bit more. What i have found with one motor is it i disconnect the start winding lead ( I believe that is what it is) and give it a spin it will spin in that direction clockwise or counter clockwise, but i can only make it start the one way.

The pictures are on the way, but i got to get my software loaded up. So it could be a day or two.

Home brew building winches like these must be a Saskatchewan thing. Only question is did you use the gearbox off a Massey combine that lifts the header? ;) I'm sure I have seen more made out of that than anything else.

Thanks again

John

home brew 08-30-2006 11:51 PM

I either don't remember or didn't know were that gearbox came from.

JADYNCC 09-06-2006 10:56 PM

If it is a single phase 110-115VAC 4 wire motor, to switch directions is very simple.
Open the j box on the motor for(CLOCKWISE) put your 115 hot(BLACK) together with T1,T3,T8, then your neutral(WHITE) together with T2,T4,T5, this will give you a clockwise or forward rotation. Then to get counter clockwise simply swap T5 and T8.
SIMPLIFIED=
Clockwise-
>>>>hot(Black wire),T1,T3,T8-----------------neutral(White wire),T2,T4,T5

Counter clockwise-
>>>>>hot(Black wire), T1,T3,T5----------------neutral(White wire),T2,T4,T8

I hope this helps you, if I can help further let me know. Jadyncc


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