PWM an electromagnetic (A/C) clutch?

[Clint Corbin]

It wouldn't like it ONE bit!  On or off is fine, but slipping WILL burn up 
that clutch faster than you can say "does anyone smell something 
burning???".  In a lot of ways, it is exactly like a transistor.  It 
doesn't draw much power off, it doesn't draw much power when it is on, but 
if you operate it in between (saturation), it uses a LOT of power.  In 
short, nice theory, but reality will quickly bit you in the butt.

Clint

At 11:25 AM 12/18/2001 -0700, you wrote:
>Any thoughts on how an A/C type clutch would like being
>PWM'd?
>
>I've been thinking about the clutch used on the supercharged
>MR2.  It's similar to an A/C clutch.  I've got an Eaton M90
>installation just about completed and was toying with the
>idea of using an electric clutch on the pulley to limit boost
>and/or have a 'valet' mode.
>
>In theory, you could PWM the clutch to limit SC rotor speed
>to get any boost level you want up to max boost.  Not sure
>how it would work in reality though.  Seems the clutch
>would maybe over-heat, or just wear out as they're not
>really designed for modulation.
>
>Any thoughts?
>
>
>thanks
>--Dan
>houlster at inficad.com
>
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