On Tue, 4 Apr 1995, Dave Kautz wrote: > Doesn't the resistance of a DC motor vary with rotational speed? I remember > something faintly about a counter-electro-motive-force i.e. the motor is > generating at the same time it's motating. Yes, that's what limits the motor's top speed. > > Here at work they always give things with motors a "locked rotor" test to > make sure it doesn't catch fire if it's seized. I thought the extra heat was > due to the extra current being drawn on account of the device not turning. > > > I'd like to understand more about the operation of electric motors, so > someone please correct me if I am mistaken. Nope, you're completely correct. With the motor not turning, the induced "counter" voltage it at it's lowest so the motor is passing it's maximum current.
> Thanks, > > Dave > > > Cheers <sstones@io.org> SStones Toronto, Ontario.
|
Please note - During the past 17 years of operation, several gigabytes of
Vanagon mail messages have been archived. Searching the entire collection
will take up to five minutes to complete. Please be patient!
Return to the archives @ gerry.vanagon.com
The vanagon mailing list archives are copyright (c) 1994-2011, and may not be reproduced without the express written permission of the list administrators. Posting messages to this mailing list grants a license to the mailing list administrators to reproduce the message in a compilation, either printed or electronic. All compilations will be not-for-profit, with any excess proceeds going to the Vanagon mailing list.
Any profits from list compilations go exclusively towards the management and operation of the Vanagon mailing list and vanagon mailing list web site.