Do You need this amount of speed (30 degrees 100ms) in both directions?
You could use a motor or rachet drive to pull against a spring to cock
the system and a small solenoid to release it.

On 15/07/05, Gerhard Fiedler <lists@connectionbrazil.com> wrote:
> Peter wrote:
>=20
> > On Tue, 12 Jul 2005, Gerhard Fiedler wrote:
> >
> >> I'm also looking into using starter solenoid coils. They probably on=
ly need
> >> a steel rod added to them that they can pull. That may work.
> >
> > Lucas makes some actuators for automotive and a/c use use but not 150=
Nm.
> > They are rotary action (90 degrees).
>=20
> It's 150 N in the configuration I thought about, but it's "only" 5 Nm.
>=20
> >> The other question is how to switch such solenoids. [...]
>=20
> > Use thick wire and thickened traces (copper rail soldered on the trac=
es)
> > and don't worry too much about it *except* for the kickback which wil=
l
> > be terrific. Does it really have to be a solenoid ? A wiper motor wil=
l
> > do what you need at 10A or less.
>=20
> Hm... maybe. It may be too slow, and not have enough torque, but it's w=
orth
> a try. I need to do the 30=B0 in 100 ms. That's about 1 rev/s, which co=
uld be
> in the range.
>=20
> In the meantime I've pretty much abandoned the solenoid idea; mechanica=
lly
> it just doesn't get there. They're either too weak or too short, or rea=
lly
> heavy. Currently the thought is more around linear actuators, but the w=
iper
> motor idea is a good one to check out.
>=20
> Thanks for helping me bounce ideas around,
> Gerhard
>=20
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