RE: [CAD_CAM_EDM_DRO] automotive alternator as a Stepper Motor

sorry, here it is, i had forgoten what i had searched under, it was a google
search for : alternator stepper...
http://www.technosmith.com/abstracts/062_StepperMotorFromAlternator.htm

-----Original Message-----
From: Dave Lantz
Sent: Wednesday, July 31, 2002 1:50 PM
To: 'CAD_CAM_EDM_DRO@yahoogroups.com'
Subject: RE: [CAD_CAM_EDM_DRO] automotive alternator as a Stepper Motor


i did a web search on the topic, and found that by.... doing...something...
darn, didn't bookmark it, now i can't find it. but it claimed that by doing
something you could get 42 steps/rev out of one, and told to put a 4-8 amp
headlight in the curcuit to keep the motor from burning... i didn't bookmark
it, maybe someone else can find it---dave L.

-----Original Message-----
From: Jon Elson [mailto:elson@...]
Sent: Wednesday, July 31, 2002 1:43 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] automotive alternator as a Stepper Motor


Doug Fortune wrote:

> I found this interesting note on an Australian website:
> Anyone have an idea how this might work?
>

Badly, very very badly! You would get something like 12 steps
per revolution, the inductance would be hideous, and it would
take a 3-phase drive, rather than 2/4 phase. Also, you'd need to
supply constant current to the rotor field, about 14 V at 2 A
or so. These units might make better 3-phase servo motors
with a somewhat more complex drive system. They would perform
about as well as a similar sized PM brushless servo motor, except
that they were not designed as servo motors, and so torque and velocity
ripple might be pretty high.

If you want a brushless servo drive, I suggest you watch eBay for a
commercial unit designed from the ground up for this use.

Jon


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