Re: [CAD_CAM_EDM_DRO] Step motor torque

I have the 42M1150 motors. The figures are correct. These motors are DOGS!
The detent torque is so high it saps the life from them. Rotor inertia is
also rather high. They won't even run with the Optistep board because it
has no ramping in jog. (You could, of course, set the rapid rate on the
Optistep to 3 IPM but that wouldn't be very useful either.)

Go with the 34M470 motors.

Doug

----- Original Message -----
From: Joe Vicars <jvicars@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Friday, January 12, 2001 10:42 AM
Subject: [CAD_CAM_EDM_DRO] Step motor torque


> Has anybody taken a good look at the torque curves provided on the
> Microkinetics web site for their stepper motors?
> For their 34M470 (big NEMA 34) the rated holding torque is 460 oz*in
> but the torque curve shows better than 500 up to about 300 rpm.
> On the other hand, the 42M1150 which has holding torque rated at
> 1125 oz*in never gets above 525 oz*in at any speed according to their
> curves.
> This is assuming both are running on the 72V supply. What's the
> deal, is this a typo?
>
>
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