John Doty wrote: > On Jan 4, 2010, at 9:20 AM, Peter Clifton wrote: > >> You could even be fancy.. and measure the inrush. Place a low-ohms >> resistor in the ground return (to sense the current), then attach to >> some kind of transistorised switch. You should be able to trigger an >> oscilloscope watching the volts across that resistor from the switch >> drive signal. (Hook up to a square wave generator or something). > > For a motor, the inrush is usually about the same as the stalled > current. So just clamp the shaft and measure current. Jason, you say > the motor takes 100 mA. Under what load condition is that? (Stall > current) > (Normal load) > (Freely spinning). >
It's an enclosed vibrating motor for haptic feedback. So, no shaft to clamp. The 100mA draw is during normal load conditions. This [1] is the motor. thx, Jason. [1] - http://www.precisionmicrodrives.com/product_info.php?products_id=200 _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
