Re: [CAD_CAM_EDM_DRO] Are these motors usefull for a Bridgeport?

I would think that the + and - connectors would be encoder
supply voltages, If these were tach output lines, then were
does the encoder get it's power from?

Steve

----------
From: Eric Keller <eek105@...>
To: CAD_CAM_EDM_DRO@onelist.com
Subject: Re: [CAD_CAM_EDM_DRO] Are these motors usefull for a Bridgeport?
Date: Wednesday, March 22, 2000 4:37 PM

From: "Eric Keller" <eek105@...>

Jon,
It sounds like we got fairly similar robots, except my robot will kick your
robots behiny;).
Robots can kill, so they tend to have brakes on the motors. My robot has 4
pin motor connectors with two going to the motor and two going to the
brake.
I guess the brake takes lots of power since it is powered on to brake and
no
power sets the robot to kill mode.
You apparently have tach generators and encoders built into the same
housing. The Z is an index and a and b channels are the quadrature.
The + and - is the tach voltage (it probly says more that +-?).
Spare is there in case they got a better deal on connectors
Usually the motor itself is a moderately tacky looking dc pancake motor so
they put it inside a fancy cast housing. You are probably looking at the
fancy cast housing and saying wha? See how hard it is to take apart and
then you will probly find out more about the motor. I think i just
successfully reverse engineered your tach/encoders for you though:)
eric
eek105@...
unfortunately my amps are all in a big 5 axis integrated form in the bottom
of a half height rack cabinet. Email if you want me to insult your robot
some more.
personally, i figured to dump the harmonic reducers, they look like a
really
silly idea.


From: Jon Anderson <janders@...>

I'd obtained an older Hirata industrial robot, and as I posted the other
day, have gutted the control cabinet with the goal of using the nice
Yaskawa servo amps therein. I was trying to off the robot itself for a
couple suitable servo motors, but it's apparently not worth the shipping
even if I gave it to a commercial reseller.
So, with clear concience, I proceeded to gut the robot for the servo
motors. One servo motor was exposed to view and the label had been
removed, but the one inside the column still had one. They appear to be
identical, and are Yaskawa model PMES-09-HL31. It's rated 26 volts at
5.5 amps, 4000 R/M (??), 100 watts. The encoder is a model TFUE-050Z-C7.
Have several questions:
First, these drove the robot through harmonic drive speed reducers.
These offer such a huge gear reduction, I'm wondering if these will
drive a Bridgeport table at say, 2:1 reduction?

Servo amps have a plug in that looks sort of like a huge automotive fuse
(the newer style) that sets the current. One is set for 7 amps, the
other 10 amps. The motor with the label is rated 5.5 amps.
Why are the amps rated higher than the motors?

There is no encoder count anywhere. I've not had the best luck tracking
down info on 15+ year old stuff. If I can't get this info from Yaskawa,
how can I determine the count. And for that matter, are these encoders
or resolvers? Pins are listed as channel A, channel B, channel Z,
common, +12vdc, ground, +, -, spare.

Last, the motor itself is a 4 wire, but I see no sign of brushes on the
housing. Could it be brushless? How would I tell?

I'll have more questions later, I'm sure.

Thanks,

Jon






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discussion of shop built systems in the above catagories.
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