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Re: [TeslaTurbine] Re: Introduction and thoughts

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  • Reese
    Ditto. Thank you, vger. Reese
    Message 1 of 7 , Sep 26, 2005
      Ditto. Thank you, vger.


      At 22:44 26-09-05 -0700, Shadow of the Redwood wrote:
      >I was looking forward to this response. Thank you for sharing.
      >vger62003 <stevefts@...> wrote:
      >--- In TeslaTurbine@yahoogroups.com, Reese <reeza@f...> wrote:
      >> >I'm very curious about modifying an electrical motor that way, can
      >> >you provide details and/or pictures?
      >> I take it, the answer is no? You cannot (or will not) elaborate?
      >> Reese
      > Sorry I did not answer, lots of stuff taking up time, laptop
      >motherboard failure, vacation, work etc...
      > About the vacuum cleaner motor mod, if you have one available you
      >should be able to see the brushes and the leads to the field coils.
      >These motors will run on AC or DC and turn at high rpm. I have not
      >destructivly tested one yet. Most of the better ones have ball
      >bearings at both ends. The method of conversion is to disconnect
      >the feild windings from the motor circuit leaving as much wire
      >length as possible. Connect a volt meter to the brush connections
      >and a low voltage power supply (5 volts will do) to one of the field
      >coils and spin the motor in the normal direction of rotation with a
      >small cordless drill or other means. Observe the polarity of the
      >voltage at the brushes and mark the brush leads accordingly as well
      >as marking the field leads with the polarity of the applied low
      >voltage. Repeat the process with the low voltage applied to the
      >other field coil to determine which polarity gives you the same
      >output polarity at the brushes and mark that field winding as well.
      >At this point you have a choice of putting the field windings in
      >series or parallel. Series (negative of one field connected to the
      >positive of the other) will let you use higher excitation voltage
      >with less current, and parallel (negitive leads connected together
      >and positive leads connected together) will let you use lower
      >excitation voltage with higher current. These motors are designed to
      >run on 120 V or 240 V 60 Hz. Applying DC to the feilds at those
      >voltages may cause them to heat up so a little experimentation may
      >be needed with a specific motor. The motor (now a generator) need
      >not be turning to check for field heating. A hefty variable DC
      >supply comes in handy.
      > In operation, a battery of appropriate voltage is connected to the
      >brushes with a power diode in series to keep the battery from
      >feeding back into the generator when not charging. A voltage
      >regulator circuit will be needed to supply power to the field coils
      >so that the output voltage is as desired.
      >Hope this helps. I did this once back in the 60's just using an old
      >regulator (relay type) from a car to charge 12 V car batteries. Not
      >a real high rate of charge compared to an alternator, but did the
      >vger :)
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