Need Help!- Custom Servo Motors MPM-11405-706

[Radius]

Hi everyone.

I have a Milltronics VM-16 with a Custom Servo Motors MPM-11405-706 Z axis motor with brake.

This motor is definitely not happy. I believe the motor has some type of internal fault. I also believe it has a bad bearing at the pulley end. The main problem I'm having is that it overloads the servo drive. Just the load of holding the Z up with the brake off is overloading the drive. I've tried swapping drives, etc. The problem stays with the Z motor.

This motor was, unfortunately, exposed to some moisture. Is it possible the thing just needs to be baked for a while? Has anyone disassembled one of these things? How hard are they to repair? Is this something that I probably shouldn't try on my own? If not, anyone know of a good, reasonably priced and honest repair outfit?

To add misery to my situation, CSM was a division of MTS Automation who got swallowed up by Parker Hannifin. Those guys basically told me that any motors made before the acquistion were obsolete, not repairable, no info... In other words.. I'm screwed..

Milltronics has been great at providing support, I just can't afford to replace this motor at a cost of many thousands of $.

Thanks,
Michael

[anothercncguy]

The MPM motors tend to have poor rotor bindings. The bindings will peel off of the rotor and get wedged in the air gap. This will cause the motor to go out on overcurrent. A lot of the time magnets will also get loose from this and can be broken. I had an MPM 3203R-1170 repaired at Servotech. They rebound the rotor and repaired/recharged the magnets. I also had them retrofit a new type of tachsyn on the back as the old Poltron tachsyn is no longer made and we damaged the back of the motor taking it off (its a big motor). They were able to come up with a new tachsyn and board that produced the same tach and hall outputs as the old one. Works great, I highly recommend them. They say the average repair is around %50 the cost of new but I spent much less than that as the motor is $45,000 new. Check them out, maybe they can help you. www.servotechusa.com

[Radius]

Originally Posted by anothercncguy The MPM motors tend to have poor rotor bindings. The bindings will peel off of the rotor and get wedged in the air gap. This will cause the motor to go out on overcurrent. A lot of the time magnets will also get loose from this and can be broken. I had an MPM 3203R-1170 repaired at Servotech. They rebound the rotor and repaired/recharged the magnets. I also had them retrofit a new type of tachsyn on the back as the old Poltron tachsyn is no longer made and we damaged the back of the motor taking it off (its a big motor). They were able to come up with a new tachsyn and board that produced the same tach and hall outputs as the old one. Works great, I highly recommend them. They say the average repair is around %50 the cost of new but I spent much less than that as the motor is $45,000 new. Check them out, maybe they can help you. www.servotechusa.com

I can't imagine a servo motor that costs $45,000 new. That's insane. It's just a motor for pete's sake!

Anyways, I'm taking the plunge. I called around to a whole bunch of servo repair shops I found searching google and these guys seems to actually know what the heck CSM even was.

We'll see. I pleaded with them to take it easy on me since I'm just a hobbyist guy.

Thanks for the info,
Michael

[Al_The_Man]

Originally Posted by Radius I can't imagine a servo motor that costs $45,000 new. That's insane. It's just a motor for pete's sake!

Especially as a new Machine is quoted as $47,000.00

If this is a DC servo (sounds like it), and you get stuck, it is fairly easy to sub another DC motor in, There are still a few Getty's and Fanuc motors come up on ebay, the brake feature may make it a bit rarer though.
Al.

[Radius]

Originally Posted by Al_The_Man Especially as a new Machine is quoted as $47,000.00 If this is a DC servo (sounds like it), and you get stuck, it is fairly easy to sub another DC motor in, There are still a few Getty's and Fanuc motors come up on ebay, the brake feature may make it a bit rarer though. Al.

Hi Al..

This is the same motor I posted about on cnczone.com. It's a AC servo motor with a tach and 1000 count encoder.

According to Milltronics, the CSM motor in my machine is a 33 lb/in motor.

I do happen to have a motor that I *might* be able to sub. Here is the nameplate data from this motor:

Type: HD92E4-22T
No: W27738
C. Stall Torque: 19.5 LB/IN 10.5A
Max 6000 RPM
132V
51A
Feedback: DC Tach3V
IP 64/65
IC 400
MK1 TO3.BRAKE 90VDC.44LB/IN. J97-73085

I don't know what most of the stuff on the nameplate means, but I assume from the info that is there that the motor will develop 19.5 LB/IN at 10.5 amps. Since the servo drives are only capable of 15 Amps (IIRC - might be 18 amps) then I don't think these motors will work as a replacement.

The motor is made by SEM for Servo Dynamics. Unfortunately SEM or Servo Dynamics is either able, or willing, to supply me with the info I need.

However, it would be wonderful to figure out the pinout on these motors as they are also AC with tach and 1000 count encoders. If I can figure out the phasing of everything I see no reason why I couldn't use one of these to built a 4th axis since my Milltronics machine is already equipped.

I have the wiring connectors for the motors, and I can figure out the wiring for the encoder since I can access that by removing the rear cover. Some of the wiring is pretty self evident. I guess the only problem I would have is figuring out the phasing of the motor and tach or ??

Any ideas where else I could obtain this info? Or any idea how to figure out the phasing? Remember that I'm scope challenged.

Thanks,
Michael