Treadmill motor speed control

Thread Starter

Blobbybob

Joined Feb 4, 2018
5
Hi all,
I appreciate this has been asked a few times but I can't seem to find a solution using the search function.

I have this motor2018-02-04 16.31.12.jpgand after watching this you tube video

I thought I knew what I was doing whenl bought the same rectifier and controller

The standard potentiometer was 500k and worked, but at 50% the motor was tearing a hole in space and time and more would trip the breaker, not really thinking I bought a cheap 200k pot like the guy in the vid, this popped the breaker as soon as power was supplied even at 0% so then tried a 1m potentiometer with the same spec as the original but that just trips the breaker as soon as power is supplied as well.

Can anyone tell me what I'm doing wrong.

Ps. I'm no electronics expert, so think layman and them dumb it down a bit.
 

MaxHeadRoom

Joined Jul 18, 2013
22,403
If you intend running a T.M. motor with one of those cheapo controllers I would suggest you get rid of the flywheel.
Controllers like the KB series or a low end T.M. board have acceleration pots etc, that make it far easier to run one of these motors.
Max.
 

Thread Starter

Blobbybob

Joined Feb 4, 2018
5
Hi thanks for the reply, I have already removed the flywheel as I need to fit a v pulley to the shaft.

I just can't work out why every value of pot I try except the original blows a fuse, higher or lower?

The 1m potentiometer is 1a 2w I thought that would make the motor run in a lower range of speeds.
 

MaxHeadRoom

Joined Jul 18, 2013
22,403
Sounds like you have something mis-wired.
The problem is the guy in the video is running a Triac controller with a bridge, you need a PWM controller to run this motor effectively and with smooth control.
You can hear how the motor growls at low RPM!.
You can either look for a PWM one on ebay or they are fairly simple to build.
Max.
 

Thread Starter

Blobbybob

Joined Feb 4, 2018
5
Thanks again for taking the time to reply.

Sorry about the you tube links but would you agree that this guys method is more suitable?

 

MaxHeadRoom

Joined Jul 18, 2013
22,403
There is no way that set up runs his 3.0hp 90vdc motor with any efficiency.
Personally I would not even entertain it.
If you keep an eye on ebay you can get a KB drive or a T.M. board for around the price he paid and have a decent controller.
Max.
 
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