Re: [CAD_CAM_EDM_DRO] Will Gecko 320 will run this servo ?

anthony_annicchiarico wrote:

>I find this used servo ! will gecko 320 run it ? which will be its
>performances ?
>
>Voltage Gradient No Load : 45 Volts/1000rpm
>Max. terminal Voltage : 180 Volts
>Max. Speed : 4000 rpm
>Continuous Stall TorqueTENV (Heat Sink Rating) : 75 lb-in
>Continuous Stall Torque Blower Cooled : 140 lb-in
>Continuous Stall Current TENV : 20 Amps
>Armature Polar Moment of Inertia : 0.094 lb-in sec2
>Torque Constant Kt : 7.5 lb-in/Amp
>Voltage Constant Kv : 0.42 Volts sec rad-1
>Peak Stall Torque : 440 lb-in
>Current at Peak Torque : 130 Amps
>Theoretical Acceleration at Peak Torque: 4500 Rad/sec2
>Winding
>Armature Resistance Less Brushes : 0.2 Ohms
>Armature Inductance: 1.2 Millihenrys
>Mechanical Time Constant : 17 milliseconds
>
>
>

Yes, but the Gecko 320 is not a very good match to this motor. Note
it has a continuous stall rating of 20 A. Without massive cooling,
the Gecko drive can't deliver 20 A continuous. With a 130 A peak
rating, the Gecko can only deliver 15 % of the motor's maximum
torque (which is still substantial). One possible problem is
the motor's high inductance and polar moment. That might cause
tuning problems if the D (damping) term doesn't have enough range.

A motor this size (23 KW input, ~25 HP) is overkill as a spindle motor
on a Ser II Bridgeport, and would be suitable as an axis motor on
a 200 Ton K&T bridge mill! Please don't tell me you're putting this
on a Sherline!

Jon