Newbie- Need Help Understanding Servo's Power

[johnmac]

I have 3 old Honeywell servos with analog tachometers. Some day I would like to replace the tachometers with encoders and replace the X and Y steppers on my router with these. they look plenty big enough, but I'm having trouble understanding their power compared to steppers.

The tag says: 30 volts, 7.2 amps, torque constant 8.75 oz-in/amp

What size (in-oz) stepper motor would these specs be equal to?

Thanks,
John

[Al_The_Man]

As you can see, if torque constant is 8.75 oz-in per amp, then 7.2 x 8.75 = 63 oz-in.
Continuous stall torque rating is 63 oz-in.
Al.

[johnmac]

Thanks Al. That's how I figured it, but I wasn't sure if it was that simple.

They seem underpowered for their size. The motor portion is a bit bigger than a nema 34 stepper that I have.

John

[Al_The_Man]

A typical BLDC servo in a NEMA 34 would be around 100 oz-in.
Al.