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Re: Permanent magnet Tesla coil

Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>

Dis some reading on that. First question that comes to mind is why they are so big given the frequency (aka: 60Hz generators are 6x+ heavier than 400Hz versions of the same power). I once had a 200kVA 400Hz generator that "only " weighed 7000lbs (spun at 2400 rpm by the spec plate irrc). Seems like the 50kHz version of that would weigh 100lbs instead of 100 tons.

Mike
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, August 18, 2005 2:40 PM
Subject: Re: Permanent magnet Tesla coil


Original poster: Steve Conner <steve@xxxxxxxxxxxx>


> For a 200kHz coil,
> the magnets need to spin at 200k rpm.

Hz are cycles per second. RPM are cycles per minute.
So make that 12 million RPM.

Read about the Alexanderson alternator for a way of
generating high frequencies with relatively sane RPMs.
Tesla owned some alternators like these and used them
to drive his coils, so it's not a new idea.

Steve Conner