Thread: ohms in chinese spindle
hi there can anyone tell me what value(ohms) betwen the 3 phase on a 2.2 kw
Depends on the motor, but typically would be 6 - 8ohms between phases if star-wired (I think this is the norm) and 2 - 3ohms if delta wired, though I have seen reports of as low as 0.5 - 1ohms.
Why do you need to know?
beacause i have one and the inverter blow the igtb so i´ve decided to buy another inverter,
but i want to make sure that my spindle isnt burn..
i´ve measured it between the 3 pins and he has 2.1 ohms in each.
i´m from portugal and there isn´t much support on this area here...
Since all the coils are the same resistance that's promising since if one phase had broken clearly there would be a difference. Check the resistance from all 3 pins to the spindle body, i.e. earth.
I will measure my spindle, which is the same rating, in a couple of minutes and report...
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hi yes i´ve measure with a standart multimeter.
in resistance mode (200ohms) when touching probes it displays 00.6 ohms.
the resistance between the 3 pins and earth gives me nothing , the multimeter just shows 1.
measuring the phases it gives me between the 3 pins , 2.0ohms
just a question , what type of motor is this? brushless???
does it work with dc voltage or ac????
AC at 400Hz or so... you must make sure your Inverter settings are right. If the startup frequency is too low for example it will overheat the motor windings but the motor won't turn. It is unusual to fry the Inverter, normally they are well protected. Have a read of this thread it might help.
Last edited by irving2008; 07-07-2012 at 11:27 PM.
Since measuring 0.6ohms when the leads are touching means the actual resistance is 2.0-0.6=1.4 ohms for each phase. I just measured mine and got 1.6ohms, so yours sounds about right. Between all the pins and earth the resistance should be extremely high, so since your meter went out of range that's good, although you can't be sure without testing at a higher voltage. Either way it looks like the spindle is fine...
As irving has said, the settings on the VFD are critical so make sure they are correct before trying again.
thanks ,i know that the settings are critical, i had mine for aboutt a year, and he has worked for 8 hours a day (no breaks).
so if it is an ac motor is it possible to test directly to the mains supply(220ac)?
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