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What does CAV mean-motor data plate?

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  • What does CAV mean-motor data plate?

    I'm working on a 60's era Italian built lathe/motor, and have not been able to translate one term on the motor data plate....CAV?

    It looks like so:

    220/220V PHZ3
    GIRI 3400/1700
    CAV 7/5
    Amps 18/13

    Ok-It's a two speed motor, GIRI apparently means RPM, but what does CAV mean?

    The spaces next to KW are blank, and the amp draw is too low to to equal 7 and 5 Kilowatts or even 7 and 5 horsepower. I've been making up acronyms, checked wiki and my conversion reference book but no luck so far.

    Any guesses?

    Last edited by SVS; 10-17-2009, 05:05 PM.

  • #2
    I'm just guessing here too, but since cavallo is horse (I think) wouldn't that be a natural for horsepower. I can't reconcile the current draw relationship unless it's just storytelling.
    "People will occasionally stumble over the truth, but most of the time they will pick themselves up and carry on" : Winston Churchill


    • #3
      I would GUESS! that it is HP since the two speeds drop by 1/2 and the
      current also drops that the HP drops also. BUT there must be some
      other wiring "Gotchas".
      HP is RPM x Torque if the torque does not increase by 2 when the
      speed goes to 1/2, (and the current looks to drop, not double)
      then .... ?????? :-) We need an Italian here. :-)


      • #4
        There are likely two separate winding sets (2 poles/4 pole), so that relationship does not hold...

        And it's three phase, so don't forget the 1.73 factor when calculating power. and you can't get directly to hp without knowing the power factor / efficiency of the motor.

        Without digging deeper, and given those currents, it's HP... and as it's Eupopean, a good chance it's delta wound.
        Last edited by lakeside53; 10-17-2009, 01:09 PM.


        • #5
          Is it a 50 cycle motor
          Bob Scott


          • #6
            Thanks guys.

            I was mistaken on a few volt and amp details-Fixed now.

            The motor is 60 cycle, six wire, and double delta/wye for HI/LO speed.

            The question is somewhat academic as I have the wiring figured out and running-It just turns out to not match my phase converter very well, being smaller than I was assuming. I'd always felt the motor was physically small for the supposed 5/7 HP or KW, but I'd never bothered doing the math till now.