German DC servo motor, will these work

[Bryscnc]

This is my first post, although I been reading posts for a long time.
I come across some German servo motors and I need help on whether they will work. I know they came off a conveyor system. The ID tag reads: PM MOT, TYPE 13 121 65 5 2 6, Nr. 1/9906/2547, 370 W, 3000 1/min, Errg. PM V, I max. 11.2 A, Anker 180 V, 2.5 A, Ff 10, IP 44 . They have encoders or tachometers on the backside and are connected to a reduction gearbox. I have a southbend mill 9x49 that I want to convert to cnc. I would like to know what kind of torque or power they have, then if they will work, is there an inexpensive drive that will handle the 180 volts required.

[Al_The_Man]

Are they AC or DC brush servo's? Although at 3000rpm probabally DC, If the units on the back have only two wires they have tach's.
370w works out to around .5hp at 3000 rpm, so they would be a bit light for your application, but it depends on wether you can use the gearboxes, ratio etc and wether they are precision, low back-lash type.
There are quite a few drives always coming up on ebay such as A-M-C and Copley Controls for two. If the motors are fitted with tach's you could replace them with encoders and pick amplifiers that can be configured for Torque mode of operation where the tach's would be redundant.
Al

[Bryscnc]

Thanks for the info. What size would be sufficient and could you give me and ballpark cost. I'm still thinking about maybe using stepper motors, but the cost will be the determining factor.

[Bryscnc]

Thanks for the info. What size would be sufficient and could you give me and ballpark cost. I'm still thinking about maybe using stepper motors, but the cost will be the determining factor.

[Al_The_Man]

Something like this would probabally do the trick, http://cgi.ebay.com/ws/eBayISAPI.dll...868610838&rd=1 the servo's I have on the Excello mills I have (8x36) are 26"lbs DC motors reduced by about 2 to 1, but that would be the largest you should require. It depends on the demands you place on the mill, servo's are the way to go, but obviously stepper are more cost effective.
But if you go the ebay route, you can level the cost difference out somewhat.
Al

[lerman]

http://www.servosystems.com/servo_motors_surplus.htm

Stock No. DM-599
Micro Electric Brushless Motor SE1008
P/N 409905---/00
(055) With brake and encoder mount
(053) No brake with encoder mount
(147) No brake, no encoder mount
3.1 KW, 220 VDC, 14.9 A, 200 Hz, 3000 RPM

Bargain Price . . . . . . . . . $162.50 ea.


Micro Electric SE1008 Servo Motor with Encoder

Stock No. DM-600



Micro Electric Brushless Motor SE1128


P/N 409905---/00


(059) With brake and encoder mount


(057) No brake with encoder mount


(163) No brake, no encoder mount


4.4 KW, 220 VDC, 20.9, 200 HZ, 3000 RPM

Bargain Price . . . . . . . . . $200.00 ea.
--------------------------------------------

These are big honking motors for not much money. What does the 200 HZ mean? If I built a variable frequency drive for it, could I use it as the spindle motor on my Bridgeport?

Ken

[HuFlungDung]

Do "German servo motors" respond to a "Stop" command or does a "HALT" command have to be used?

[arvidb]

The 200 Hz means you have to run them at 200 Hz to get 3000 RPM. 3000 RPM = 50 revs/s so I guess that means they are four pole motors?

Also since they've got encoder mounts I guess they don't come with encoders. And they look very wide, perhaps this is some kind of high inertia motor that is not as good as normal servo motors in terms of acceleration? Just guessing...

Arvid