DC motor circuit

[RogerA00]

Hi, I' trying to adapt a motor from an overhead door to another use. I removed the circuit board and would like to insert a switch to permit intermittent operation in either direction. It uses AC power fed through a transformer, and there are two leads from it and two leads and a ground from the motor.
My research said to use a DPDT toggle switch and an "H" circuit. I tried that and it only buzzed in one direction, nothing in the other.
I had tested the motor using the circuit board, and it ran in one direction. Even if it had worked in both directions, it would not provide the control I need.

So can anyone offer another approach to try? Thanks.

 

[Skogsgurra]

And shame to all others?

As I said, Eng-Tips is not about hobby work and definitely not the kind of confused and improductive discussions like the ones we have had in this thread.

My first search on Ebay.com gave me several real low-cost alternatives. Like this one:

http://www.ebay.com/itm/12V-24V-DC-...897?pt=LH_DefaultDomain_0&hash=item27f7202e49

If you haven't been able to find a usable geared DC motor for less than USD 300 - 400, then I must say that you haven't tried very hard.

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

 

[OperaHouse]

That doesn't look like any overhead door I've ever seen. It either has a locking position or you are feeding AC into it. You still have given us no useful information on the circuits you have tried. There is a total failure to communicate technical issues. More pictures would help. There should have been solid movement with 12V battery unless the battery couldn't supply even minimal amps. You are frustrated and so are we. None of this makes sens at all. It is not a matter of attitude.

 

[flexoprinting]

Hey Roger

My apologies, I meant no offence to you or your post. I was replying to Waross (Bill) whom like others on this forum are outstanding, awesome, and very helpful
with highly educated advice, But they need good information to reply accurately for example just read some of the other post and their replies.

Sincerely, Chuck

 

[ScottyUK]

Roger,


I do agree with the guys above about the lack of info - that picture is helpful. One of the control board might also be worthwhile

Did you try the motor on straight DC from a car battery? Does it work in both directions? Even at 12V it will turn over if there's no load, so if it doesn't then it is probably u/s.

 

[Skogsgurra]

A 24 V DC motor will start on one or two volts and run perfectly well on 12 V. If it doesn't - it's smoked. This discussion is not the least productive. Buy a 20 dollar motor. Read the site rules.

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

 

[waross]

The door head was discarded because something was wrong with the board and it was judged simpler to replace the entire unit.

OK, well I could not move the motor with either a battery charger or a single battery.

The motor should start and run at half speed, unloaded with 12 Volts applied.
So, the system failed and someone familiar with these systems replaced the entire system. You were given the old broken parts. Guess what. It's still broken. Everything that you have told us points to:
THE MOTOR IS BROKEN.
The best technical advice that I can give you is throw it away and find something that will do your job on E-bay.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[theode]

Have you tried the motor leads only, disconnected from the board?
Does the motor turn mechanically (you need to take the motor from the gear,this gives you access to the motor shaft.
It will feel a bit tight because of field magnets.
One problem with this type of motor is the magnets breaking off and jamming the insides.
You need the motor in your hand without the rest of the stuff,then its process of elimination.