Discuss 12 volt CD motor test in the Electrical Forum area at ElectriciansForums.net

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:   American Electrical Advice Forum

D

Davidfarm

Hi

My names is David.

I'm hoping you can help with my treadmil motor before the thing drives me potty. (I might have just posted this else where so if I have apols...did just seemed to disappear.)

Briefly, due to being new to the treadmill I think I under lubbed the belt and put too much strain on the motor....I was getting some slightly strange smells.

I have been advised that I have PROBABLY burnt out the motor but before I spend money on a replacement I just wanted to comfirm if poss with some checks.

I rigged up with a 12 v battery pack (and drill battery reading about 11.5v) which didn't fully energy the motor.....just seemed to make it twitch is the best description I can think of.

I also used a multi meter to check resistance. I have read it should give 30/50 ohms in the stationary position. It read 5. When I rotated the spindle it alternated between zero and over load. The brushes seem fine.

I am not discounting issues with the speed ontroller/MCB (whats the difference?)but I think the mootor is the place to start.

Any advise would be gratefuly recieved!



David
 
as you rotate the armature, the resistance readings will fluctuate slightly, but you should read continuity at any position. an o/c would indicate bunt out windings. if it smells it's probably knackered.
 
Thanks for the reply.

How much is slightly? How much fluctuation would you expect?

Sorry whats an o/c?
 
as you turn it the meter will fluctuate, due to a bit of resistance on the brushes. o/c is open circuit . (O/L on meter).
 
Yes, if you twist it slowly it reads beween 5 and 200 ohms.

If you twist it quickly it indicates over load.

Does this mean the motor is ok?
 
turn slowly. at any position it should read low ohms, 5 is about right. higher readings mean bad brush contact or burnt out windings.
 
ah!

I was gettiing 5 ohms...but also far higher, often 200/300 ohms (turning slowly).

The brushes are ok so seems to comfirm burnt out windings?
 

Reply to 12 volt CD motor test in the Electrical Forum area at ElectriciansForums.net

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

Electrical Forum

Welcome to the Electrical Forum at ElectriciansForums.net. The friendliest electrical forum online. General electrical questions and answers can be found in the electrical forum.
This website was designed, optimised and is hosted by Untold Media. Operating under the name Untold Media since 2001.
Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock