Re: Will Gecko 320 will run this servo ?

not to mention a tiny voltage problem as a Gecko is rated for 80 V
max. Unless you were happy running it at about 1800 RPM

Thanks
Aaron Moss
WWW.IndustrialHobbies.com

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
>
>
> 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