RATTMMOTOR CNC Spindle Motor 2.2KW Air Cooled Spindle Motor 220V 80mm Spindle Motor ER20 Collet 3HP 24000RPM High Speed Spindle Motor 8A 400Hz for CNC Router Engraver Milling Machine

Easy to install and works well, well worth the money.

I bought this as a backup almost a year ago. Today, the collet on my original spindle got stuck and became impossible to remove after running into a clamp. I thought, no big deal I'll just throw on the backup. I put it on, wouldn't run. I got an over-voltage error. Checked parameters on vfd, reset vfd and redid parameters, no change. Set up my backup vfd (a nice durapulse vfd) and this time the spindle would run, but only very slow and in reverse and smoked after SECONDS. Very hot to the touch. Checked and rechecked wiring, I wired it correctly. Checked for continuity between pins and BOOM, continuity between pin 2 and 3 on the spindle. Not on my wiring. I pulled the top of the spindle expecting some crappy wiring at the plug which would be an easy fix. Nope, it's further inside the spindle and it doesn't appear to be serviceable. I wasted HOURS messing with this only to find they sent me a $200 paperweight to begin with. I'm way past the return window because this was a backup and never meant to be in service unless it was an emergency... Well, that emergency just became much worse. I will be pursuing a refund still but I wanted to warn others to stay away from anything from RATTMMOTOR