Re: [TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous Motor -

[gary350@xxxxxxxxxxxxx]

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.

http://i67.photobucket.com/albums/h292/mikeweaver/gap2.jpg






-----Original Message-----
>From: Clive Penfold <clivepenfold@xxxxxxxxxxxxxx>
>Sent: Dec 6, 2010 7:24 AM
>To: tesla@xxxxxxxxxx
>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 
>volts. 
>
>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) 
>quite happily 
>
>from 30  volts AC where it draws 0.8 amp to 80 volts AC where it draws 5 amps at 
>no load. 
>
>
>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 
>controller circuit.
>
>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 
>originally posted.
>
>Regards,
>
>Clive
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