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  1. cmiller

    AC vari drive motor

    Thanks to "TheDog" and to "tmahan" for your replies. This inverter and motor are used in a machine that polishes the surface of silicon wafers before any circuits are laid down. Wafers are arranged under 'heads' in a cloverleaf pattern with this particular motor driving a...
  2. cmiller

    AC vari drive motor

    Motor has mind of its own!! I have a Toshiba 3 phase induction motor, (480 VAC, 0.75 Kw, 4 pole, 1.5 Amps) being driven by a Toshiba VFA5 480V inverter, that randomly accelerates to max speed without any noticable change in current, voltage, frequency, etc. It is driving the customer and I...

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