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
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
phase to phase is a short.
any phase to ground should be greater than 100Megohm
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.
Are all of the phase to phase readings the same? 0.008 does seem a bit low.
Jim Dawson
Sandy, Oregon, USA
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
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
Not easily.
Jim Dawson
Sandy, Oregon, USA
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.
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
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
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.
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
Hi, inductance is 0.9mH, I´have used a WAYNE KERR 6425 RLC METER
Hi,
what about the other two phases? Inductance imbalance is quite pronounced in faulty three phase machines.
Craig
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!!!!
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
Anyone else has a FANUC spindle motor and a low resistance meter?