Peter wrote:

> On Tue, 12 Jul 2005, Gerhard Fiedler wrote:
>=20
>> I'm also looking into using starter solenoid coils. They probably only=
 need
>> a steel rod added to them that they can pull. That may work.
>=20
> Lucas makes some actuators for automotive and a/c use use but not 150Nm=
.=20
> They are rotary action (90 degrees).

It's 150 N in the configuration I thought about, but it's "only" 5 Nm.

>> The other question is how to switch such solenoids. [...]
=20
> Use thick wire and thickened traces (copper rail soldered on the traces=
)=20
> and don't worry too much about it *except* for the kickback which will=20
> be terrific. Does it really have to be a solenoid ? A wiper motor will=20
> do what you need at 10A or less.

Hm... maybe. It may be too slow, and not have enough torque, but it's wor=
th
a try. I need to do the 30=B0 in 100 ms. That's about 1 rev/s, which coul=
d be
in the range.=20

In the meantime I've pretty much abandoned the solenoid idea; mechanicall=
y
it just doesn't get there. They're either too weak or too short, or reall=
y
heavy. Currently the thought is more around linear actuators, but the wip=
er
motor idea is a good one to check out.

Thanks for helping me bounce ideas around,
Gerhard

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist