ohms in chinese spindle

**edgas10** · 07-07-2012

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????

**irving2008** · 08-07-2012

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.

**edgas10** · 08-07-2012

Originally Posted by irving2008

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.

hi there, did you checked the resistance value??

**Jonathan** · 08-07-2012

Originally Posted by edgas10

when touching probes it displays 00.6 ohms.

measuring the phases it gives me between the 3 pins , 2.0ohms
just a question , what type of motor is this? brushless???

It's a 3-phase induction motor, so if you can find a 3-phase induction motor (they're very common) you could use that to test the VFD with the right settings.

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.

**edgas10** · 08-07-2012

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)?

**irving2008** · 08-07-2012

Originally Posted by edgas10

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)?

No, these spindles are designed for 400Hz VFD only, they will not run on a 50Hz supply