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Discuss 12 Volt DC Motor and Carbon Fiber housing in the Industrial Electrician Talk area at ElectriciansForums.net

M

Mino

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Hello all.

I hope Im in the right place to ask help for a problem that I have.
I am engineer and not electrician and I do not have any special knowledge on this subject.

I am producing a tool which is mainly made of aluminium and plastics and Its purpose is to harvest olive trees.
Low weight of this tool is a key factor for high productivity and easy handling
by the user.

Anyway, I am now replacing aluminium parts with Carbon Fiber and one of them is the housing of the electric motor of this tool. This part is made of iron and replacing it with CF saved me 200gr which is a great gain for the tool as a whole.

But here start the unexpected ( for me) trouble...
I knew before changing it, that the housing width has a role to the magnetic field of the motor. Anyway I made the CF to have exactly the same inner and outer diameter as the iron. But when I placed it on and started the motor it seemed to me that it was running faster. I used my digital rpm counter and it showed me with exactly the same voltage and no changes unless the housing an increase of about 650 rpm, almost the double!!! With iron its 850 and CF 1500 :eek::confused: . I also noticed that motor lost its capability to maintain rpm when stressed. I cant use it with so many rpm for the safety of the motor but also for reducing rpm issues.
Does anyone have an idea of what is going on??

Thank you in advance.
 
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M

Mino

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