Re: [CAD_CAM_EDM_DRO] Magnetic rotay encoders.

In my research on the magnetic encoders it does mention that they are very
tolerant to contaminates and fluids. I guess the biggest worry is shorting
out the little circuit board for the sensor. The gap between the sensor and
the magnetic wheel is only .004" But I am impressed. I'll have to look to
see if they have these in a linear magnetic encoder.

Dan

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, August 06, 2004 9:59 PM
Subject: Re: [CAD_CAM_EDM_DRO] Magnetic rotay encoders.


> Dan Mauch wrote:
>
> >Yesterday I received a servo motor with encoder to evaluate. The first
thing
> >I did was to remove the encoder cover. I was surprised to see that it was
a
> >magnetic encoder. I am not familiar with them so I did a search on Google
> >and found a few reference documents that confirmed my suspicion that they
> >were a TTL encoder and the wiring was similar to that used on other
encoders
> >and was compatible with the G320/G340 and other servo amps.
> >I hooked it up to a test G320 and confirmed that it was a 500 CPR encoder
> >that in quadrature was 2000 PPR. It only drew 25 ma thus making it a good
> >candidate for a small servo driven cnc machine. I talked with Marriss
and
> >he indicated that the magnetic type were usually more expensive than the
> >optical type. Does anyone have any experience with these type encoders on
> >working machines?
> >
> >
> I'm just tinkering with a Yaskawa brushless motor that uses a magnetic
> encoder.
> it seems that the motor had gear oil leak into it, and nobody even
> noticed, as the
> encoder was still working just fine. Obviously, an optical encoder
> would not work
> too well when partially filled with oil!
>
> Jon
>
>
>
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