Baldor 24 Volt DC Motor - Help Identify Please

Art Isador

Greetings gentlemen-

I have several Baldor 24 Volt DC "Servo" motors, (Please see photo at: http://tinyurl.com/eqcto )

I have several questions and hope to find some help here if I may enquire:

Is this actually a stepper motor? Or is this a shunt wound PM?

These are on Millitary mobile X-Ray base units and were manuactured in early 1988. ( http://tinyurl.com/j9qyz )

I find little or no information on these motors so am having difficulty determining how they are run.

What type of controller would be needed to run these motors?

Will these motors run without the Tach feedback?

Is there a simple controller available?

Thank- you in advance for you consideration.

Sincerely,

Art

Bruce Bates

Art -

That appears to be a DC servo motor (NOT an R/C servo motor). They are ususally driven by a dedicated controller board, such as the one below:
http://www.rtdusa.com/PC104/UM/controller/esc629.htm

As far as I am aware, DC servo motors do require some sort of feedback, which may be an encoder, or a tachometer, depending on the specific application. The military is big on using DC servo motors, due to their extreme positioning and re-positioning accuracy.

Regards,

Bruce Bates

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Art Isador

Thanks Bruce -

That looks pretty complicated to me. I'm not that good-
What do you think about a controller such as the Rboteq AX2550 ( http://www.roboteq.com/ax2550-folder.html ) ??

This one seems more user friendly to me and apparently could use a joystick or RC? easily ...

I'd like to be able to pretty much jump right on the motors and use them because they are a major pain to get off and replacements would be pretty expensive.

Thanks for your help - very much appreciated-

Art

Bruce Bates

Art -

Please help me read that label a bit here. Across the top line of the variable information it looks something like this:

Part No.······· ?????? Stall·· Serial No.
100272C-00· ?????? oz-in··· 27123

Can you fill in the question marks for me?

TIA.

Regards,

Bruce Bates

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Bruce Bates

Art -

One additional question. Are you SURE that's a tachometer attached to the motor, and not an encoder?

Regards,

Bruce Bates

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Art Isador

Hi Bruce -
Thanks again for your help-
The motor info is the same on two different labels on the motor:

Part No. 100272C-00 Torque-Stall 192 )Z-IN Serial No. 27123
Cont. Current 20 Peak Current 95 AMPS Max Volts 24 DC No Load Speed 1500 RPM
Tach output (nothing listed) Volt. Const. Ke 16 v/krpm
Mfg. Code 04/88

Here is a photo of the Nameplate or label:
http://tinyurl.com/lwt8f

I am NOT sure that it is a tach generator. It's somethings I've not run into before.
The back end (away from the motor) has magnets - if you'll look again at the photo-
I don't really know.
The only markings on it on the outside end are:
R100 101-152
I guess it's possible it's like a hall-effect do-hickey?
I don't no nuthin' 'bout chinery I guess... (scratches head)

Thanks again Bruce, hope this additional info is helpful.

Regards,

Art

Art Isador

Thanks again for the help.
Looks like I've got it working.
I just bench tested the motor today using a Victor 885 Speed Controller.
Used a little RobotLogic Servo tester and the motor powered up just fine and reversed no problem.
Apparently the unit on the end of the motor is a brake.

So that get's me going. RC is easy, next I'd like to be able to find a simple, inexpensive controller that will let me use a joystick without a lot of fuss.

Again, thanks -

Art

bennettdan

Art you can use a BS2 and a anolog joystick to get you motor running with a H- Bridge curcuit. I have a little project like that myself I can give you some more info if you are interested in making your own controller.

Art Isador

Hey Dan-

Yes I'd be happy to review your info - sounds very interesting - maybe send via email or PM?

Thanks very much

bennettdan

I will look some info up tonight and get it to you for a simple controller that will get you going with a stamp.

bennettdan

Hey this setup will provide PWM without tieing up the proccessor to much. We can sort out some code for you when you get it built. The 74HC132AN are all in one chip and the N-Channel mosfets need to be selected for your current draw. The 74HC132AN is used to provide the PWM and also·is used to select between forward and reverse.

Post Edited (bennettdan) : 7/6/2006 11:26:33 PM GMT

Art Isador

Thanks very much Dan- PM sent -

Art