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May 12, 2003, 09:07 AM
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West Yorkshire, UK
Joined Sep 2002
123 Posts
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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, 10:28 AM
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Oxford/England
Joined May 2001
3,998 Posts
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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 |
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May 12, 2003, 10:30 AM
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London UK
Joined Apr 2002
1,447 Posts
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ooh..
..didel actuators ! Do they come in 200ohm versions? Josh |
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May 12, 2003, 10:32 AM
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sw missouri
Joined Sep 2001
343 Posts
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Graham,
The RFFS-100 will drive 25 ohms. Bob |
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May 12, 2003, 10:36 AM
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Oxford/England
Joined May 2001
3,998 Posts
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Josh, not the ones I am stocking
Bob, Thanks. Graham |
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May 12, 2003, 10:42 AM
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Buffalo, New York
Joined Jan 2002
1,024 Posts
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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 |
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May 13, 2003, 04:49 AM
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Oxford/England
Joined May 2001
3,998 Posts
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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 |
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