What's the likely spec of this Electro-Craft DC servo?

I've had this servo motor for a while and want to utilise it but I cannot find any catalogue info so I'm asking if anyone could tell me what would be the likely maximum input voltage it should be used at continuously.





It comes with a built in tacho generator so I've run some tests using 24v power tool batteries. I've removed the 18:1 gearbox off the end (it has metric fasteners BTW) and took rpm readings straight off the 12mm shaft.

24.25V input - 0.91a - 670rpm - 11.48v tach
48.25 input - 1.16a - 1400rpm - 24.04v tach

I was kinda hoping that the tacho output would be less than 10v then my plan was to extrapolate the motor input voltage from that, but the tacho voltage being about half the input voltage has got me stumped.

Any ideas as to what the standard input voltage/operating speed should have been?

Electrocraft seems to still be in business. ph # 844-338-8114. Prob someone there who can tell you all you want to know.

Thanks Neilho,

I've just found a catalogue page that agrees with my measurements for the 723 series. 14v/krpm tacho and 35v/krpm motor voltage constants. It quotes the max speed and voltage as 3000rpm and 107v which gives me enough to go on.