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1.5 hp dc motor

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sean logie29/12/2018 13:21:15
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608 forum posts
7 photos

Was at recycle centre today and score a dc motor . The guys there let me strip all the parts I might need . Next is how I'm going to get this thing working ,kinda hoping you guys on here might know 🤔.

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David Standing 129/12/2018 13:56:07
1297 forum posts
50 photos

I suspect running machines aren't toooooo popular on here!

sean logie29/12/2018 13:58:54
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608 forum posts
7 photos
My wife has the all singing and dancing treadmill in the spare bedroom and hardly uses it .

Sean
Maurice Taylor29/12/2018 14:30:42
275 forum posts
39 photos

I would connect the motor to a car battery and see if it does anything,should go slowly.

Dave Halford29/12/2018 17:14:21
2536 forum posts
24 photos

250v DC sounds like fun

Brian Sweeting29/12/2018 18:25:17
453 forum posts
1 photos

What machine did it come from, this might gives clues to the controller ?

sean logie29/12/2018 18:38:13
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608 forum posts
7 photos

It's off a treadmill don't know what model . I have the stop start and the speed control switches, I forgot to take the power on switch .

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Edited By sean logie on 29/12/2018 18:40:38

Rockingdodge29/12/2018 18:43:43
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396 forum posts
111 photos
Posted by Dave Halford on 29/12/2018 17:14:21:

250v DC sounds like fun

It won't be 250 vdc it'll be circa 110 vdc as it's half wave.

You can get power supplies from Banggood and other reputable chinesium suppliers.

sean logie29/12/2018 18:46:46
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608 forum posts
7 photos

So I can't use what's in the photos ?

Rockingdodge29/12/2018 18:48:14
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396 forum posts
111 photos

These treadmills often need the display board to function properly, at the very least there will be a speed sensor that needs to be triggered to allow the power to be applied, no rotation sensed, no go.

The power supplies I mentioned have a speed pot on them so that they will vary the speed.

sean logie29/12/2018 19:06:31
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608 forum posts
7 photos

What would you suggest , I wouldn't know where or what to look for ,more so not knowing what to look for .

Sean

Rockingdodge29/12/2018 19:07:19
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396 forum posts
111 photos
Posted by sean logie on 29/12/2018 18:46:46:

So I can't use what's in the photos ?

Without seeing the rest of the electrics as they were it's difficult to say yay or nay.

Normally there would be a display board which sits between the 2 handles and has a failsafe key and then one or two boards down the front. if there were two boards and you have the correct one it could work, if there was only one board then you probably need the display as well.

It would be worth trawling through youtube videos on treadmill motors as they are popular for converting to 1 x 72" belt grinders.

sean logie29/12/2018 19:12:24
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608 forum posts
7 photos

There wasn't any display in the middle it was missing ,and as far I could see the circuit board I have was the only one .

Sean

Rockingdodge29/12/2018 19:14:57
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396 forum posts
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Posted by sean logie on 29/12/2018 19:06:31:

What would you suggest , I wouldn't know where or what to look for ,more so not knowing what to look for .

This one from Banggood is what I bought - AC90V-260V Input DC110V Output 8A PWM DC Motor Speed Controller Driver Speed Governor. Currently at £42

**LINK**

search on youtube for "treadmill motor conversion", that will keep you occupied for a bit. What ever you do don't dump it as they are a very popular motor.

Rockingdodge29/12/2018 19:53:04
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396 forum posts
111 photos

Sean, another possible source for help is bigclivedotcom, he has excellent reverse engineering skills and could be willing to help with your board. His email address is bigclive1@gmail.com

John Rudd29/12/2018 20:15:49
1479 forum posts
1 photos

Sean, I beg to differ on the operating voltage of the motor....

Why would any decent manufacturer run a 250 v dc motor on 110v?

The more info/pictures you can supply on the pcb, the better advice you will get befote spending your hard earned cash on another controller...

I daresay, BigClive would ask the same questions.... ( I'm not questioning his technical expertise...)

Robert Atkinson 229/12/2018 20:45:09
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1891 forum posts
37 photos

The motor is clearly rated at 220-240V DC 5A. The control PCB looks a bit rough, ou need to be careful as 240V DC is deadly, arguably more so than AC. The simplest way to drive this would be a Variac and bridge rectifier. A high voltage PWM drive would give better control though, possibly with speed feedback.

More photos of the PCB please.

Edited By Robert Atkinson 2 on 29/12/2018 21:24:28

Bill Davies 229/12/2018 20:51:30
357 forum posts
13 photos

I have a similar freebie. I have a 3HP DC motor from a scrapped York treadmill. The controller was failed, and not thought economic to replace (excuse for new, bigger treadmill). It requires 180VDC which doesn't seem to align with any type of rectified 250VAC mains. I appreciate that a switched mode supply could run it, although nowhere near 100% 'on' ratio, close to 50% (340V peak, 680V peak-peak?).

I tried it on a 20VDC power supply, and it ran slowly with reasonable torque (like Maurice's test above). Is there a logic to the full speed voltage? Is half the waveform thrown away, then the voltage is chopped, or am I missing something?

Bill

sean logie29/12/2018 20:56:52
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608 forum posts
7 photos

Now I'm confused (not hard) which is it ? 240vdc or 110vdc . I've been researching YouTube and the net ,and I'm thinking of going the SRC motor controller and bridge rectifier route , but things like 240vdc being more dangerous simply worries me 🤔😐. So can anyone say for definite what this motor is , I'm tempted to throw it back in the skip 😁😂. On a side note , I'm not needing this motor to run full tilt but will it have torque at low rpm say at 100-200 rpm 

 

Sean

Edited By sean logie on 29/12/2018 21:00:31

John Rudd29/12/2018 20:58:43
1479 forum posts
1 photos

Bill,

The purpose of the control baord is to take AC mains, convert it to DC and supply it to the motor. I'm sure you appreciate that thus far.

One way of supplying said juice to the motor is via a Thyristor bridge controlled with appropriate circuitry, this will pulse the voltage to the motor, so that at max beans, the motor only sees 180Volts....Another method is to use a FET(s) in a pwm controlled circuit.....

Sean, my comments apply to  your motor...., these control methodologies are adopted by the various manufacturers of the mini mill/lathe....Sieg have used both as an example..

Edited By John Rudd on 29/12/2018 21:02:14

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