PWM an electromagnetic (A/C) clutch?

[Mos]

Hi Dan,

I've seen a 4AGZE SC clutch after 12 or so years of use. It didn't look
pretty and it no longer clamped properly, and that was with normal use. So
yes, they do wear out and I don't think they'd last long at all if you
tried to slip them on a regular basis.

As for valet mode, just turn the SC off! :) (And open the ABV). You could
limit it more by leaving the ABV closed, as the engine would have to suck
through the SC (which would spin, slowly).

Mos.

On Tue, 18 Dec 2001, Daniel Houlton 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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