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IndustryArena Forum > Machine Controllers Software and Solutions > Fanuc > help with spindle motor winding resistance 10hp
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  1. #1
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    help with spindle motor winding resistance 10hp

    Hi

    Someone knows de resistance value phase to phase for a AC spindle motor 10hp, A06B-1008-B200.

    I read 0,008 ohms, is a 200V 35amp motor, I have over current in dc link, but with a 2.2kw motor it Works

    Thanks

  2. #2
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    Re: help with spindle motor winding resistance 10hp

    phase to phase is a short.
    any phase to ground should be greater than 100Megohm

  3. #3
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    Re: help with spindle motor winding resistance 10hp

    yes, but I need to know resistance value pahse to pase for this kind of motor to determine if is good or not, I think that is about 0.040 ohms, but I have 0.008.

  4. #4

    Re: help with spindle motor winding resistance 10hp

    Are all of the phase to phase readings the same? 0.008 does seem a bit low.
    Jim Dawson
    Sandy, Oregon, USA

  5. #5
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    Re: help with spindle motor winding resistance 10hp

    Yes all three with the same value, I have a driver error over current in dc link, but with a little 2.2kw motor driver works. Fanuc doesn´t have resistance winding data for this type of motor

  6. #6

    Re: help with spindle motor winding resistance 10hp

    I just checked my A06B-0754-B200 7.5KW, 31 amp. I get about 0.1 ohm phase to phase, measured at the drive

    I used my Fluke 87-V meter.
    Jim Dawson
    Sandy, Oregon, USA

  7. #7
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    Quote Originally Posted by Jim Dawson View Post
    I just checked my A06B-0754-B200 7.5KW, 31 amp. I get about 0.1 ohm phase to phase, measured at the drive

    I used my Fluke 87-V meter.
    Thanks, do you have any way to draw the motor with 1 amp DC for example and measure the voltage in mv, or a megger. FKUKE V87 resolution is 0.1 ohms only

  8. #8

    Re: help with spindle motor winding resistance 10hp

    Not easily.
    Jim Dawson
    Sandy, Oregon, USA

  9. #9
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    Re: help with spindle motor winding resistance 10hp

    Just use a D cell battery, connect a 10 gauge wire, 1 foot or 10 feet long. compare the voltage across the wire with the voltage across the coils in the motor. 1 foot of 10 awg is very close to .0010 ohms. you'll need to check both voltage a few times because the current is going to start dropping pretty quickly. or use two volt meters at the same time.

  10. #10
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    For spindle windings you can use an LCR meter. They are much cheaper than a milli ohm meter and give a much clearer answer if your windings are good or bad by measuring inductance. I use this one: https://www.peakelec.co.uk/acatalog/lcr40-atlas-lcr-meter.html

  11. #11
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    Re: help with spindle motor winding resistance 10hp

    Quote Originally Posted by Robowi View Post
    For spindle windings you can use an LCR meter. They are much cheaper than a milli ohm meter and give a much clearer answer if your windings are good or bad by measuring inductance. I use this one: https://www.peakelec.co.uk/acatalog/...lcr-meter.html
    unfortunately both of the strangers in this thread would have to have the same lcr meter to get any meaningful information.

  12. #12

    Re: help with spindle motor winding resistance 10hp

    Quote Originally Posted by Eldon_Joh View Post
    unfortunately both of the strangers in this thread would have to have the same lcr meter to get any meaningful information.
    Very true, I think it would get close, but that is not really the best way to test a motor. I have a LCR meter but I'm not sure the results would be meaningful. I'm running a job in the lathe so tearing into it to get some readings is not going to happen. If I had the motor on the bench, then I would spend the time to set up a proper test.

    I would take the motor to a motor shop and have it checked out. That motor is a standard 3 phase induction motor, not a servo. Running it on a 3 phase line and getting amp readings would be the best test.
    Jim Dawson
    Sandy, Oregon, USA

  13. #13
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    Re: help with spindle motor winding resistance 10hp

    Quote Originally Posted by Jim Dawson View Post
    Very true, I think it would get close, but that is not really the best way to test a motor. I have a LCR meter but I'm not sure the results would be meaningful. I'm running a job in the lathe so tearing into it to get some readings is not going to happen. If I had the motor on the bench, then I would spend the time to set up a proper test.

    I would take the motor to a motor shop and have it checked out. That motor is a standard 3 phase induction motor, not a servo. Running it on a 3 phase line and getting amp readings would be the best test.
    unfortunately 8milliohms sounds like a direct short across more than just one coil of wire, more like a coil group or between several coils. you'll know really quickly if you have a shorted turn. maybe with a thermal camera you could fix it before a complete rewind is required.

  14. #14
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    Re: help with spindle motor winding resistance 10hp

    Hi,
    I have a milliohm meter, not an expensive one , but still about $800USD. Does a good job down to 1mOhm at about 1%
    but will read down to 10uOhm at about 10%. Has proven to be very useful in detecting faults in transformers and high current
    paths in welders.

    At 8 mOhm is pretty low, what confidence do you have in the accuracy and repeatability of that measurement?

    I think you would be better off trying to measure the inductance of the coils, Any shorted turns would show up very dramatically
    in an inductance measurement.

    Craig

  15. #15
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    Re: help with spindle motor winding resistance 10hp

    Hi, inductance is 0.9mH, I´have used a WAYNE KERR 6425 RLC METER

  16. #16
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    Re: help with spindle motor winding resistance 10hp

    Hi,
    what about the other two phases? Inductance imbalance is quite pronounced in faulty three phase machines.

    Craig

  17. #17
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    Re: help with spindle motor winding resistance 10hp

    I have to check it, all that I have is the report from a repair center. When I test the motor with my oscilloscope and a current probe, motor draws 180 amp on start up. Repair center saids that in star configuration motor has 0,23 ohms, and in delta 0,003 ohms!!!!

  18. #18
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    Re: help with spindle motor winding resistance 10hp

    some thing does not add up

    if the 0.23 ohms is the resistance of 2 coils in series

    the resistance across 2 wires from the Delta connected motor
    will be one coil in parallel with the other 2 coils connected in in series

    the resistance will be
    the product divided by sum of the parallel resistances

    0.115 x 0.23 divided by 0.115 +0.23

    = 0.02645/0.345
    = 0.0766 ohms which is a lot more than the Repair center said


    0,003 ohms looks more like a short circuit

    John

  19. #19
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    Re: help with spindle motor winding resistance 10hp

    Thanks John-100, is what I´ve seen.
    Now I only need to measure a good motor to compare, or a FANUC motor specs to claim at repair center.
    I´m wating for FANUC EU answer






    Quote Originally Posted by john-100 View Post
    some thing does not add up

    if the 0.23 ohms is the resistance of 2 coils in series

    the resistance across 2 wires from the Delta connected motor
    will be one coil in parallel with the other 2 coils connected in in series

    the resistance will be
    the product divided by sum of the parallel resistances

    0.115 x 0.23 divided by 0.115 +0.23

    = 0.02645/0.345
    = 0.0766 ohms which is a lot more than the Repair center said


    0,003 ohms looks more like a short circuit

    John

  20. #20
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    Re: help with spindle motor winding resistance 10hp

    Anyone else has a FANUC spindle motor and a low resistance meter?

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