3 phase vs single phase

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3 phase vs single phase

Home Forums General Questions 3 phase vs single phase

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  • #384910
    Roger Williams 2
    Participant
      @rogerwilliams2

      Hello all, thnks for the replies. When I turn the pot down, the motor RPM reduces with the lowering of the frequency on the display. Theres no danger of the spindle rotating because I disengage the clutch. I rarely touch the Pot, just leaving the VFD at 50hz.

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      #387997
      sean logie
      Participant
        @seanlogie69385
        Posted by Mark Rand on 08/12/2018 23:02:23:

        Sean, an important question that no one has asked yet:- What lathe is it?

        1/2hp is suitable for a Myford sized lathe, but 3/4 is better for even an ML7 (I speak from experience). A lathe that's sized for a 2hp motor is not going to be happy with larger work or more aggressive cuts if hobbled by a 1/2hp motor.

        In terms of power consumption, the losses of a 2hp single phase motor will be greater than those of a 1/2hp single phase motor or 3ph motor + VFD, but the difference is likely to be no more than 25-50W. I.e.. 3/5 of 5/8 of F-all, as one of my colleagues used to say.

        The suggestions of getting a plug in power meter are your best bet. They are cheap these days (especially when Aldi or Lidl have got them on sale, but also from a number of online sellers), and can give you a good idea of just what in the house is eating the power.

        Before you do anything else though, have you got an immersion heater that someone's turned on? smile o

        Hi Mark , the 2hp motor was total overkill . The lathe is 12×24 Fortis (clausing derived). I've now fitted the 1/2hp motor now , I do notice a difference and in future will have to be more patient in my turning …ie… smaller cuts 🤔. I'll probably look for a 3/4-1hp motor in the future .

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