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[TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous Motor
Allow me to reveal my latest discovery or possibly invention if no one has
thought of it before!
A vacuum cleaner motor can be made to run at synchronous speed with the
addition of a diode; actually 2 in parallel for mechanical balance
Mains vacuum cleaner motors are usually series wound AC brush motors. The one I
removed from a 1100 watt Miele cleaner ran at 18,000 rpm and drew 5 amps at 240
Having dismantled it, I soldered two 3 amp 1000 volt diodes across 2 opposite
commutator segments (180 deg apart), tucked down behind the commutator. One
would have done
but to maintain physical balance, I used a pair opposite each other and applied
a liberal amount of epoxy resin to stop them flapping about.
The motor is still series connected as before and runs at 3000 rpm (at 50 Hz)
from 30 volts AC where it draws 0.8 amp to 80 volts AC where it draws 5 amps at
One thing that I haven't looked at yet is the phase change of the rotor as the
load varies but it is probably no worse than an induction motor with flats
machined on it. I don't see why it shouldn't respond to John Freau's phase
I will be interested to hear of other peoples experiences who try it.
There is a discussion running on this subject on the tcbouklist, where I
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