Connect two of the three phase wires coming from the motor directly to the
mains. The third wire will be connected to one of the other lines via a
capacitor. The line it's connected to determines the direction of the
rotation.
The capacitor value must change depending on the conditions.
During the starting (2 to 5 sec; max) a 30 to 100 µF 265 Vac capacitor will
do the job.
As soon as the motor reaches its nominal load and speed, 1.5 to 5 µF 330 Vac
is enough. The big capacitor must be disconnected.

I've a grinder wired like that which has been working for years.

Several old washing machines were equipped with such capacitors and values.
They were using single phase motors with two windings (lo & hi-speed) with
two capacitors each to be able to start under load. A centrifugal switch was
ensuring the capacitor change.


a écrit dans le message news:
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I forgot to mention that I live in the UK and my supply is 220/240. and
the pump is a 220/380v 50hz 1hp 075kw and 5.3amps