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180v motor not working on new control board

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John Haine15/01/2022 11:46:01
4622 forum posts
273 photos

It's certain that if the motor can deliver up to 2 HP, or even 4 HP for short periods, it will take a lot more current than the original mini lathe controller is rated at, so not surprising the fuse is blowing!!

If you can access a 12V DC supply (e.g. a car battery), the motor would run happily on that albeit at much reduced speed if it is working properly. That would show up any problems such as shorted windings etc. But it might also short the battery so putting a fuse in series would be advisable.

If this is not something you have the confidence or knowledge to do, then don't fiddle!! Why buy a 2HP motor for a mini-lathe if you can't anticipate the speed controller might have problems?

Andrew Cressey15/01/2022 12:12:49
59 forum posts
12 photos

John the control board is not from a mini lathe this topic is for a mill that has a new bigger control board and upgraded motor.

Andrew Cressey15/01/2022 12:15:36
59 forum posts
12 photos

I have just connected the motor to a drill battery the motor runs but clunks as it goes round.

duncan webster15/01/2022 13:34:25
3919 forum posts
61 photos

2 hp on a mini mill sounds like overkill to me

SillyOldDuffer15/01/2022 13:42:08
Moderator
8469 forum posts
1885 photos
Posted by Andrew Cressey on 15/01/2022 12:15:36:

I have just connected the motor to a drill battery the motor runs but clunks as it goes round.

Oh dear, that's pretty conclusive: the cause isn't the controller or the wiring. I'm as sure as I can be without seeing it that the Treadmill motor is faulty.

If the case against the motor wasn't already strong enough, the photo of the controller wiring looks good.

I think Andrew's been unlucky: he's done everything right only to be stabbed in the back by a dud motor. Presumably it's second-hand and there isn't a supplier who will replace it free of charge? If so, how annoying, but try another one.

Dave

AJAX15/01/2022 15:04:57
366 forum posts
42 photos

The motor is rated for 4000 RPM and I'd guess that may be a bigger problem. Or do mini mills have significant reduction by the way of pulleys or gears? I have no experience using one.

Howard Lewis15/01/2022 16:09:49
6005 forum posts
14 photos

The plate confirms that it a Permanent magnet DC motor.

The fact that it knocks when run off a separate source, suggests to me that there is at least one armature winding that is either short or open circuit. A short circuit will be what keeps blowing fuses.

Luckily, it does not seem to have damaged the control board irreparably.

Either way. the motor is your problem, and is for practical and economic purposes, scrap.

Solution,

Buy and fit a motor that is correctly rated to match the control board.

Howard

Andrew Cressey15/01/2022 19:09:42
59 forum posts
12 photos

I have removed the fan a for some reason knocking has stopped but it judders when running.

Andrew Cressey15/01/2022 19:30:43
59 forum posts
12 photos

here is a video.

**LINK**

Peter Cook 615/01/2022 23:48:47
258 forum posts
73 photos
Posted by Andrew Cressey on 15/01/2022 19:09:42:

I have removed the fan a for some reason knocking has stopped but it judders when running.

Fan (possibly slightly loose) was acting as a sound board. The motor is knackered. Any further effort is a waste of your time.

Andrew Cressey16/01/2022 08:26:00
59 forum posts
12 photos

Hi Peter the person i bought it from suggested the bearings sounds damaged?

AJAX16/01/2022 10:27:41
366 forum posts
42 photos

If after this escapade you wish to continue with DC motors but keep your costs low, I recommend looking around for a used / spares only treadmill on Facebook marketplace. They are frequently available for very little money, sometimes free. I suggest keeping the running belt as it can be repurposed for many tasks.

Best of luck, Brian

Andrew Cressey16/01/2022 10:41:28
59 forum posts
12 photos

 

Thanks everyone for all your help i have just purchased a new motor i hope this is more suitable for my application.

Mod edit: tried to rotate the photo and failed! Other Mods have more luck

Edited By SillyOldDuffer on 16/01/2022 11:27:03

Edited By SillyOldDuffer on 16/01/2022 11:32:38

 

Edited By JasonB on 16/01/2022 16:14:01

SillyOldDuffer16/01/2022 11:25:42
Moderator
8469 forum posts
1885 photos
Posted by Andrew Cressey on 16/01/2022 08:26:00:

Hi Peter the person i bought it from suggested the bearings sounds damaged?

Knackered bearings would explain rough running, but not the fuse blowing. There's an electrical problem.

Unfortunately a shorted armature winding explains rough running and the fuse blowing. I'm 99% sure your motor is a dud and needs to be replaced.

Nothing wrong with Treadmill Motors as a type, but bear in mind a second-hand motor may have been removed from a worn-out Treadmill. Although many treadmills are bought and rarely used, others are thrashed to death. Overheating is a likely cause of shorted windings: the motor was worked too hard for too long.

Dave

Peter Cook 616/01/2022 11:27:35
258 forum posts
73 photos
Posted by Andrew Cressey on 16/01/2022 08:26:00:

Hi Peter the person i bought it from suggested the bearings sounds damaged?

Damaged bearings are highly unlikely to cause the controller fuse to blow unless the motor is so stiff to turn by hand that it is overloading, and I think you would have noticed.

Dave got there before me!

Edited By Peter Cook 6 on 16/01/2022 11:28:22

John Haine16/01/2022 13:54:13
4622 forum posts
273 photos

That looks like a tidy new motor. I'm intrigued that it's a DC motor rated at 50/60 Hz though...

How many connections does it have, and does it have a field winding?

AJAX16/01/2022 14:08:25
366 forum posts
42 photos
Posted by John Haine on 16/01/2022 13:54:13:

That looks like a tidy new motor. I'm intrigued that it's a DC motor rated at 50/60 Hz though...

How many connections does it have, and does it have a field winding?

Perhaps it is a universal motor, but being sold as a DC motor? Greenmaster doesn't appear to be a brand or manufacturer with any data sheets.

Andrew Cressey16/01/2022 16:04:40
59 forum posts
12 photos

here is a bit of information about the new motor.

https://hackaday.io/project/1730-improved-machinetool-dc-motor-controller/log/4941-specing-out

John Haine16/01/2022 16:10:29
4622 forum posts
273 photos

Yup, seems it must be a permanent magnet field dc brush motor.

Edited By John Haine on 16/01/2022 16:10:39

Andrew Cressey17/01/2022 09:40:50
59 forum posts
12 photos

This is off topic but i am selling a chester 920 lathe if anyone interested

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