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Re: [TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous Motor -
All the vacuum clean motors I have all have brushes. I can vari the speed with a variac. This things turn some unreal RPMs. I use all my vac motors to build Variable Speed Vacuum Fan Spark Gaps. As I crank up the speed spark length gets longer and longer I can dial in maximum spark length in about 5 seconds.
>From: Clive Penfold <clivepenfold@xxxxxxxxxxxxxx>
>Sent: Dec 6, 2010 7:24 AM
>Subject: [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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