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-   -   3ph motor (https://www.askmehelpdesk.com/showthread.php?t=52866)

  • Jan 7, 2007, 01:30 AM
    danar
    3ph motor
    I'm having only a single phase supply. How can I run my 3phase motor without using
    A phase converter?
  • Jan 7, 2007, 05:20 AM
    tkrussell
    You can't.
  • Jan 7, 2007, 06:47 AM
    Fr_Chuck
    As noted it is not possible. You could change out the motor with a new motor that is single phase
  • Jan 7, 2007, 10:04 PM
    danar
    One of my colleague advise to connect a capacitor. Motor terminal R. S to be connected direct to the single phase line and motor terminal T will be connected in series with a capacitor connected to any one of the two hot line. The size of the capacitor will be twice the winding reactance of the motor to create a different phase angle displacement.
    I have not tried, but does this work?

    Thanks. Happy new year.
  • Jan 9, 2007, 04:46 PM
    rdot
    This might make the motor jump or spin for a second as it creates a pseudo 2 phase solution. However, it's more likely the cap will explode.

    What your friend is suggesting is similar to how a "starting capacitor" works on a split phase motor. However, such caps can't sustain the prolonged current draw, and besides you need 3 phases for a 3 phase motor. Think of a motor as a rotating electromagnet. The rise and fall of each phase pushes and pulls the motor in a given direction. You need all three phases working in harmony to achieve your goal.

    If you can't get you hands on an inverter, try looking for a motor controller that converts single phase power to a 3 phase output. It's basically the same thing.
  • Apr 12, 2007, 08:09 AM
    eeseely
    Quote:

    Originally Posted by rdot
    This might make the motor jump or spin for a second as it creates a pseudo 2 phase solution. However, it's more likely the cap will explode.

    What your friend is suggesting is similar to how a "starting capacitor" works on a split phase motor. However, such caps can't sustain the prolonged current draw, and besides you need 3 phases for a 3 phase motor. Think of a motor as a rotating electromagnet. The rise and fall of each phase pushes and pulls the motor in a given direction. You need all three phases working in harmony to achieve your goal.

    If you can't get you hands on an inverter, try looking for a motor controller that converts single phase power to a 3 phase output. It's basically the same thing.

    The motor controller is the way to go.
    I would also go to a motor repair facility and see if you could trade
    Your single phase for a 3-phase...

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