On Aug 18, 2009, at 4:02 PM, Harry Veeder wrote:
----- Original Message -----
From: Horace Heffner <[email protected]>
Date: Tuesday, August 18, 2009 7:21 pm
Subject: Re: [Vo]:BB motor - surprising experiments
On Aug 18, 2009, at 11:34 AM, Harry Veeder wrote:
If you reduced the diameter of the axle would that make it more
"efficient"?
Less efficient, because more energy will go into heat.
Yes. but wouldn't it allow you to use less current?
Well, you can get less current by applying less voltage. If you add
unnecessary resistance you just up the voltage you have to have to
get a given current, and thus the power input to get a given
mechanical output. For example, the fact Kyle has a steel shaft
instead of aluminum might be increasing his motor resistance to the
point he needs to up the voltage on his transformer to get performance.
Determining the minimum current you need to keep the motor turning
seems like important parameter to me. (Please excuse me for asking
if you have already done this. (-:
If you think that is important then a good way to accomplish that is
to buy a couple bearings and work on it. I think you'll find the
minimum current depends on the bearing type and condition, rpms, and
other things. It could make for quite a study.
Best regards,
Horace Heffner
http://www.mtaonline.net/~hheffner/
