Electronics > Beginners

Understanding series wound DC motor waveform ?

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nurbster:
Hi Forum.  Can somebody explain what is wrong with this motor based on voltage and current waveforms ?  This 12V motor should draw somewhere around 10A, don't have specs, but I do know that 24A+ is definitely not right.

Thanks, nurber

nurbster:
I don't have a reference of what a good series wound DC motor should look like so would appreciate anybody that can provide a link.

Benta:
The waveforms look fine for a series wound motor. The big question is: what's your mechanical load?

nurbster:
Thanks for replying. This is without a load and motor seems to spin easily enough so I don't think it's an issue with bushing, bearings, etc.

Benta:
NEVER run a series motor without load. It will accelerate towards infinity, worst case the anchor will disintegrate.
As it is now, it's running at far too high rpm, which explains your excessive current draw.

Another point: series DC motors are very often timed for a certain rotation direction and will not perform well if reversed.

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