Re: [CAD_CAM_EDM_DRO] Re: steppers or servo?

Jon,

The three phase motors are a follow on to the five phase motor project and
are a lot easier to build and cheaper to produce. I have three and will be
testing them soon.

Bob Campbell

----- Original Message -----
From: Jon Elson <jmelson@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Tuesday, July 11, 2000 12:49 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: steppers or servo?


>
>
> Mariss Freimanis wrote:
>
> > Dan and Bob. I looked up the info and it appears to be a three-phase
> > brushless DC motor with an integral encoder and drive electronics.
>
> Cute idea. It probably builds on the use of these motors in disk drives
>
> and all sorts of other applications. But, when moving very slowly, I'll
>
> just bet there's a torque transient when the motor switches windings.
> They would have to work VERY hard on the winding pattern to avoid
> a significant transient, since this is likely a 2-pole motor winding,
> like
> the disk drive motors, and so it only gets commutated 6 times (or is it
> 12?) per revolution.
>
> Jon
>
>
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