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Jim Diamond

On 2017-02-03 at 18:36 AST, wrote:
On Thursday, February 2, 2017 at 1:58:04 PM UTC-6, Electric Comet wrote:

the vfd opens up some possibilities for using 3 phase equipment

The other way to get three phase power is to use a VFD Variable
Frequency Drive. Common on lathes that need variable speed from the
motor. VFD takes the two legs of the 220 single electricity in and
creates the third leg to power the 3 phase lathe motor. Assume the
VFD can change the amount of electricity going out to make the motor
variable speed.

That's not how it works. The variable frequency drive varies the
frequency (as its name says) to vary the motor speed, which works
since the speed of an induction motor is a function of the frequency
of the supply voltage (and, to a lesser amount, the amount of load on
the motor).

Cheers.
Jim