ATB Spindle Repair

Description – ATB Spindle Repair

Make – ATB

Model – KUVF 180L/4C-21B

This 90Kw ATB Spindle motor was one of a batch our customer took off his machine for routine overhaul. When we received it at our works we performed a light run test to determine the condition. The motor maximum operational speed of this type of motor is 4000rpm. The winding is a 4 pole winding so we had to run the motor at 200Hz to reach the maximum operating speed.

This would not have been possible if we did not have our 160Kw High Speed Spindle Test Rig. The magnetizing current for this motor is in the region of 200amps so a large spindle drive is needed to run this motor. After a few minutes running at 4000rpm we noticed high vibration on the non drive end. The motor was stripped down and fully overhauled. The non drive end bearing housing was worn eccentrically.

This was bored, sleeved and machined to size. New bearings were supplied and fitted, the cooling fan was overhauled and the motor was fully tested at operational speed on our test rig.

ATB Motor prior to repair

ATB Motor prior to repair

 ATB Motor after repair and full 4000rpm test

 ATB Motor after repair and full 4000rpm test