Re: [CAD_CAM_EDM_DRO] Re: Bridgeport servo motors

I'm not sure who but someone asked if I can supply Nema42 servo motors vies
a vi Nema34 servo motors and I said no. I called my manufacturer and they
do carry them but they are pricey compared to the Nema34 motors but they
have peak torque of 165 Lb in (2640 oz in). and continuous torque of 27.6 lb
in(441 oz in) The list price w/o encoders is $900 but I can sell them with
encoders for $750 each plus s/h.
I can also get the same motor with a tach and encoder for a little bit more
for those that need tach feedback.
I can also get new 45.5 lb in (720 oz in contin.) and 273 LB in nema 42
frame motors (4368 oz in) motors with encoders for about $825. The last
motor is in stock.
The motors are all 90VDC and all have the rear shaft set up for .250D code
wheels and a 1.812 DBC for the encoder mount.
dan
Camtronics Inc

----- Original Message -----
From: "Polaraligned" <polaraligned@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, February 04, 2005 12:28 PM
Subject: [CAD_CAM_EDM_DRO] Re: Bridgeport servo motors


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>> Second, your 800 VA transformer is woefully inadequate. It is so far
>> undersized you could not even run 1 motor on it up to power. A week
>> or 2 ago I posted a complete example of how to design a power
>> supply. Search for this.
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> OK Wally, so based on my motor specs, what should I figure the max
> current I need available to be? In your post on power supply design
> you assume your motors need 7 amps each.
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> Here are the motor specs again:
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> Torque constant: 44oz-in/amp
> Voltage constant: 32.5v/1000 rmp
> Peak torque: 600 oz-in, or 37.5 in-lb
> Nominal voltage: 40vdc
> Maximum voltage: 60vdc
> Demagnitization current: >20amps
> Terminal resistance 2.60 ohm
> Max rpm at 50vdc is about 1200 rpm
> No-load current <.51 amp
> armature inertia .09oz-in-sec^2
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> I don't think 20amps x3 motors (60 amps!!!) would be the right
> answer. Then again, I=60v/2.6 ohms = 23 amps!!, not taking
> any emf into account. What should I figure these motors need
> to make them happy? A 60 amp power supply would be a monster.
>
> Thanks,
> Scott
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