RFFS100 & 4mm pager motor - RC Groups
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May 12, 2003, 10:07 AM
Lapsed Non Modeller
Andycart's Avatar

RFFS100 & 4mm pager motor


Hi Guys

I've been reading up on using 4mm pager motors for control surface actuators instead of the conventional coils and magnets.

Can I connect these directly to the coil outputs on the RFFS100 or will they draw too much current ?

If not, Graham do you stock the right type?

Andy
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May 12, 2003, 11:28 AM
Sticky Shepherd
Graham Stabler's Avatar
The RFFS is rated for 50ohm (I think) so just add a resister in series to make the resistance up to 50.

Cheers,

Graham

p.s. Will have Didel actuators on my site soon
May 12, 2003, 11:30 AM
Thats NOT indestructible
j8m8l's Avatar
ooh..

..didel actuators ! Do they come in 200ohm versions?

Josh
May 12, 2003, 11:32 AM
Registered User
bselman's Avatar
Graham,

The RFFS-100 will drive 25 ohms.

Bob
May 12, 2003, 11:36 AM
Sticky Shepherd
Graham Stabler's Avatar
Josh, not the ones I am stocking

Bob, Thanks.

Graham
May 12, 2003, 11:42 AM
Registered User
dhurd's Avatar
The RFFS-100 is also limited to about 250ma so you will need to be careful if you stall the motor that it won't draw too much current.

Dan
May 13, 2003, 05:49 AM
Sticky Shepherd
Graham Stabler's Avatar
If it is 250mA per channel then it can drive 4.2v/0.25A = 16ohm.

Probably better to be safe and go for 25ohm though normally you cannot just measure the resistance of a motor and assume the current it will draw but in this case the motor will be stalled. Still, I would set it up as an actuator with some resistance in series to see what it draws then reduce or increase as nessecery.

Graham