Continuing the discussion from Is anybody using the Masso Beta v5.100b upgrade?:
Hey Garry,
your posting was off-topic in that thread.
There are cheap no-name chinese spindles, and there are also high quality chinese spindles, e.g. like Jian-Ken spindles. There is more than one user in this forum that runs one. The PwnCNC spindles and VFDs (DELIXI Hangzhou Inverter Co., Ltd., model CDI-EM61) are made in China. There are cheap chinese VFDs and there are high-quality chinese VFDs. There are a lot of highest-quality spindles available from Germany. Usually their manufacturers offer not only the necessary accessories like pre-programmed VFDs, spindle cables, and ready-to-use VFD cabinets, but also servicing the spindles, e.g. exchanging bearings or retrofitting air sealing.
For the price of a Mechatron without ATC you can get a medium-expensive Chinese Jianken with ATC, which can be seen at work here and which was presented in these posts, and for a medium price you can get a Jianken without ATC with 80 mm diameter and ER20 collet. It is worthwhile to look at this direct comparison video in terms of vibrations, between a cheap ebay spindle vs. a Jianken spindle (video) (shown is the JGL-100 2.5kw 24000rpm ATC with ISO 25 taper).
A 2.2 kW 220 V spindle, on a VFD for 2.2 kW 220 V spindles, requires a VFD whose max. input current is at least 24 A, a fuse of 30 A is recommended. See here for explanation and links to VFD requirements. Please don’t forget that a VFD is a AC-to-DC-to-three-phase-AC inverter. Not only every inverter has loss, but first of all a VFD is a device that delivers three 220 V currents on three wires simultaneously, each shifted by 120°. So if your spindle is rated with 10 A, this means 10 A per phase.
I have shown this with veryfiable data often enough in this forum, please see the link above. A three-phase power is not computed like AC current U*I, but U*sqrt(3)*I, and a VFD input current rating is not to be confused with the VFD output current. See here for more details how spindle current and power are computed.
See also Incorrect or missing data on cheap chinese VFDs and spindles
You forgot the third way to cool a spindle: With an electronically, heat-sensor controlled fan, like on many spindles, e.g. like the Teknomotor 2.2 kW 6,000–24,000 rpm spindle with HSK32 tool changer, ceramic bearings and air-cooled with E-fan shown here in operation. This is an example of air-cooled spindle whose fan can very well continue to run after the spindle was stopped.