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Date:         Wed, 5 Apr 1995 12:23:53 -0400 (EDT)
Sender:       Vanagon Mailing List <vanagon@vanagon.com>
From:         sstones <sstones@io.org>
Subject:      Re: Big Battery = Destroy Starter

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.


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