On 16/03/2018 22:55, Andrew Gabriel wrote:

Main wash pump motors that I've seen in dishwashers are all
2-phase with a run capacitor.

The waste pumps in dishwashers and washing machines are all
shaded pole motors.

Drum motors in washing machines are universal motors (i.e.
with brushes) when belt driven, and stepper motors (brushless)
when direct drive. Drum motors need good starting torque and a
very wide speed range, which the other motors above don't have.

I can still recall my parents' first washing machine, which
predated any sort of electronic motor control. I'm not sure
what the motor was, but it was single speed, single direction.
It had a sodding great gearbox attached with a handful of large
solenoids around it to do the gear changes. I can still clearly
recall the loud bangs as the different solenoids engaged to
change the drum speed throughout the program. When it was
scrapped, I saved the mains solenoids and some other parts,
which got used in a few projects afterwards. They did tend to
overheat, as the washing machine was for 200V mains, and had
been converted to 240V when the mains voltage changed by
fitting a large autotransformer inside the case, which I
hadn't kept because it was too heavy.

When did the machine date from? Was it an early automatic? My parents
had a single drum followed by a twin tub, neither of which required a
gearbox or speed controls I imagine as the motors drove dollies and
impellers and pumps and mangles and spin driers.

--
Max Demian