Re: Gecko and Servos Again !

Download this program and play with it,.. very handy
http://www.electrosales.com/warner/software/ Camas.exe

The globe motors I believe are 24 oz in cont. 190 peak

http://www.globe-motors.com/21en_in.pdf

--- In CAD_CAM_EDM_DRO@y..., Drew Rogge <drew@p...> wrote:
> Bill,
>
> Believe me when I say that I have no idea about stepper equivalency
> but I have three of these motors with G340's waiting to be connected
> to them. After talking to Mariss when I was ordering the 340's he
> suggested that I could calculate maximum peak torque by chucking the
> shafts of the motor in a drill press and measuring the voltage and
> current output when the motor was spun. Here are the notes I took
> while on the phone:
>
> To calculate the continuous torque of a motor:
>
> Hold the motor in a vice, chuck up the motors output shaft
> in a drillpress set on slow speed. Turn on the drillpress
> and measure the voltage on the power connectors (VDC).
> Switch the voltmeter to DC amps and measure the amperage.
> Putting the voltmeter into DC amps puts a load on the motor.
> This load will try to spin the motor in the vice. Caluclate
> armature resistance by dividing the motor output voltage by
> current. To calculate mechanical peak torque divide rated
> voltage of the motor (30 volts for instance) squared by
> four times the armature resistance ie.
>
> V*V
> -------
> 4R
>
> Use half this value and the continuous torque.
>
> If I got this wrong hopefully Mariss will find it in his heart to
> correct me :-) Here's the results I got for one of the motors:
>
>
> 5.68 VDC
> 3.33 DCA
>
> 1.7057 Armature Resistance
>
> 131.91 Max. Peak Torque
>
> Hope this helps,
> Drew
>
>
> wanliker@a... wrote:
> >
> > How about the following:
> >
> > What size stepper would this be equivalent to?
> >
> > 2600 RPM GLOBE MOTORS, #537A274. 30.3 VDC permanent magnet
reversible motor.
> > The motor has ball bearings and has an optical encoder mounted on
the rear.
> > The no-load speed is 3780 rpm, no-load current is 0.2 amp. With a
load of 60
> > oz-in, the rpm is 2600 @ 5.6 amps. This is a very powerful cool
running
> > motor. The encoder employs a Hewlett Packard HEDS 9100 read head
with a
> > custom encoder disc. The encoder has a two-channel quadrature
output with 512
> > counts per revolution. The encoder requires 5 VDC at approx. 40 mA
for
> > operation. The shaft is 1/4" dia. x 7/8" long. The shaft has a
flat running
> > full length. The motor has four tapped mounting holes on the shaft
end of the
> > motor face. The holes are tapped for #6X32 tpi screws. The bolt
centers are
> > 1-1/16" apart. Electrical connections are made via 3/16" quick
connect tabs
> > connected to the brush bosses. Dimensions: 2-1/8" dia. x 5" long.
Stock
> > #DCME9950
> >
> > Thanks,
> > bill
>
> --
> Drew Rogge
> drew@p...