Hi all,
I'm rebuilding an old Abene mill. I took apart the main motor, replaced bearings and put it back together. Now I'm testing it with a cheap import VFD and the motor is shaking violently at low RPMs. The vibration is reducing with higher frequency and it completely disappears at 60 Hz.
What could be the reason for this vibration/shaking? Did I messed up something during the assembly? Or it's just a problem with the cheap VFD? I triple checked all the windings and connections. There are no shorts, everything appears to be in order. I don't have any excessive experience with induction motors/VFDs. I tried to run 2 other motors with that VFD and they spin smoothly at any frequency. Those motors are much smaller though.
I'm not planning on using a VFD with this mill. I have a legitimate 3-phase circuit in the garage and I want to keep everything original. I only use the VFD for testing. VFD is powered off a single phase 240v if that matters.
Specs for the motor/VFD are attached and here is a short video for your entertainment:
I'm rebuilding an old Abene mill. I took apart the main motor, replaced bearings and put it back together. Now I'm testing it with a cheap import VFD and the motor is shaking violently at low RPMs. The vibration is reducing with higher frequency and it completely disappears at 60 Hz.
What could be the reason for this vibration/shaking? Did I messed up something during the assembly? Or it's just a problem with the cheap VFD? I triple checked all the windings and connections. There are no shorts, everything appears to be in order. I don't have any excessive experience with induction motors/VFDs. I tried to run 2 other motors with that VFD and they spin smoothly at any frequency. Those motors are much smaller though.
I'm not planning on using a VFD with this mill. I have a legitimate 3-phase circuit in the garage and I want to keep everything original. I only use the VFD for testing. VFD is powered off a single phase 240v if that matters.
Specs for the motor/VFD are attached and here is a short video for your entertainment: