Going to buy a OneFinity in the near future - Spindle or Router?

[Aiph5u (Aiph5u (not affiliated with Onefinity))]

Hey Mark,

@Dantech

Maybe someone can explain what a VFD is with regard to a spindle?

@Aiph5u

Image: Three-phase electricity: Each wave is shifted by 120°.

A VFD is an AC-to-DC-to-three-phase-AC inverter, which means, first the AC input current from the supply line is rectified to DC power, then it is stored in a large capacitor, and then an array of six IGBTs controlled by a microcontroller switches the three output currents on and off to form the three output current waves on the fly.

The speed of the motor is then controlled only by the variable frequency of the three-phase current.

VFDs can drive asynchronous induction motors, some like Omron MX2 or Hitachi WJ200 also are able to drive synchronous motors (permanent magnet motors). The latter can be used for slow speed high torque applications like milling steel.

• Differences between router and spindle

Regarding using a VFD see also the following informative postings:

• here,
• here
• here,
• here and