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Re: [TCML] Secondary and Primary Assistance
In a message dated 3/18/08 1:36:10 P.M. Eastern Standard Time,
>Be sure to get the double-build magnet wire. It handles the higher turn to
>turn voltages better --- these potentials are much higher than an electric
>motor which usually uses single build wire.
Electric motors *aren't* usually wound with single build wire. At least
not name-brand American integral-horsepower three-phase motors. NEMA MG-1
specs call for the insulation to withstand 1600 Volts on inverter-duty motors.
With the advent of IGBT-switched inverter drives in the past 15 years, motors
have had to suffer increased stresses from the fast switching times. Failures
occur because of corona inception between phases, mainly at the end turns
outside of the stator slots. With longer cables from the drive to the motor,
turn-turn voltages deep within each winding can easily exceed 2000 Volts with
every switching event!
In a typical Tesla coil that produces 500,000 volts peak top voltage, it
will probably have 1000 turns. That works out to around 700 volts per turn.
In a message dated 3/18/08 2:10:15 P.M. Eastern Standard Time,
>DC, I've heard you say over and over again to use only double-build magnet
wire to ensure against
In DC's defense, that's not the only type of wire he's advocated. In
he recommended using silver-plated copper wire with Teflon insulation.
Serious, expensive stuff (and very hard to varnish!).
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