On 01/06/18 23:54, Johnny B Good wrote:
On Fri, 01 Jun 2018 22:00:16 +0000, Andrew Gabriel wrote:

====snip====


Serious power motors are *exclusively* induction motors - no other type
is used.

Correction: Serious (industrial) power motors are *exclusively* *Three
Phase* induction motors. :-)

Yes but they aren't driven directly from 50Hz.

So the disadvantages of fixed frequency working dont apply.



--
Of what good are dead warriors? €¦ Warriors are those who desire battle
more than peace. Those who seek battle despite peace. Those who thump
their spears on the ground and talk of honor. Those who leap high the
battle dance and dream of glory €¦ The good of dead warriors, Mother, is
that they are dead.
Sheri S Tepper: The Awakeners.