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  1. #1
    Join Date
    Feb 2006
    Posts
    15

    Help identifying servo

    Hi everyone,

    A friend of mine came across what appears to be some sort of servo motor, and we are having trouble identifying it. Any help anyone could give would be appreciated, here is what we have so far:

    Motor specs:
    Torque Systems Incorporated

    An EG&G Rotron Co.

    Waltham, MA USA

    Model No. MT-2015-017U4G10

    Dual motor shafts, 1/4" dia.

    Motor diameter: 2.02"

    Motor case length: 5 3/4"

    Windings are 0.014" diameter copper
    The motor is labeled "PM Field DC Servo Motor" and has one of those ancient DC generators as a speed output (pretty much a 2nd brushed motor going along for the ride). I ran the motor at various voltages, measured the rpm with an external tachometer, and measured the voltage from the generator. I've never played with one of these before, and I was (literally) shocked at the results. At 45.8 VDC to the motor (the highest the DC power supply I'm using can go), the motor hit 7414 rpm, and the output of the DC generator was 102 Volts! Yowza! (Here I was expecting something like 5-12V.)

    Anyone familiar with this era of technology have an idea of what this motor is supposed to be running at? At no load I measure the following:

    3773 rpm @ 24.0 V, ~0.28 A, Vgenerator = 52.5 V

    5767 rpm @ 36.0 V, ~0.30 A, Vgenerator = 79.4 V

    7414 rpm @ 45.8V, ~0.30 A, Vgenerator = 102.4 V

    At stall, it pulls about 3.5 A @ 24 V. (I wimped out on higher voltages.)

    Any help anyone can give us, I would appreciate it!

    Thanks

  2. #2
    Join Date
    Dec 2003
    Posts
    24216
    These motors are the same as the CMC models, you should be able to find it here, they have been a work horse motor for many years .
    http://www.cmccontrols.com/servo_motors_downloads.asp
    http://www.cmccontrols.com/downloads...duct_Guide.pdf
    The 'DC generator' is a DC tach that was previously used on velocity drives, they are not generally used now with Torque mode drives.
    I am pretty sure you have exceeded the maximum RPM that these motors are rated at, I think the highest rpm model was 6krpm.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  3. #3
    Join Date
    Mar 2007
    Posts
    137
    Al is the man! I have seen a lot of servo motors, and i don't remember any going over 4,000 rpm.

  4. #4
    Join Date
    Dec 2008
    Posts
    17
    Hi dear friends.

    I need the data sheet for this servo motor. I took this info from the nameplate:

    PM FIELD DC
    SERVO MOTOR
    EG&G
    TORQUE SYSTEMS
    MODEL NO:ME4257 118E
    CODE 0916
    SERIAL NO 692662

    I can not find any info on the web.

    Any help .

    Thanks.

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