The 2.2kW spindle has a power rating of 2.2kW or 2200 watts. If the VFD AC voltage input is rated for 220 volts, then 2200 watts / 220 volts is 10 amps, so a 15 or 20 amp breaker will work. If the VFD AC voltage input is rated for 110 volts, then 2200 watts / 110 volts is 20 amps, so a 25 or 30 amp breaker will work.

Bottom whorl, or low whorl spindles have a shaft with the whorl close to the bottom. With so much weight at the bottom of the shaft, bottom whorl drop spindles are more stable and less bouncy than top whorl drops. They are the preferred drop spindle for plying and are also good for heavier weight yarns.

Spindles and their VFDs. Spindles have much more flexibility and power than a router, thanks to the VFD (Variable Frequency Drive), or inverter, which allows for precise speed control of the spindle. The Spindle is simply the motor and tool holder, while the VFD is the electronics that controls the spindle.