Ask Experts Questions for FREE Help !
Ask
    danar's Avatar
    danar Posts: 69, Reputation: 2
    Junior Member
    		  
    #1

    Jan 7, 2007, 01:30 AM
    3ph motor
    I'm having only a single phase supply. How can I run my 3phase motor without using
    A phase converter?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
    Uber Member
    		  
    #2

    Jan 7, 2007, 05:20 AM
    You can't.
    Fr_Chuck's Avatar
    Fr_Chuck Posts: 81,301, Reputation: 7692
    Expert
    		  
    #3

    Jan 7, 2007, 06:47 AM
    As noted it is not possible. You could change out the motor with a new motor that is single phase
    danar's Avatar
    danar Posts: 69, Reputation: 2
    Junior Member
    		  
    #4

    Jan 7, 2007, 10:04 PM
    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.
    rdot's Avatar
    rdot Posts: 7, Reputation: 1
    New Member
    		  
    #5

    Jan 9, 2007, 04:46 PM
    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.
    eeseely's Avatar
    eeseely Posts: 100, Reputation: 3
    Junior Member
    		  
    #6

    Apr 12, 2007, 08:09 AM
    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...
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Motor wiring? [ 4 Answers ]

:mad: Perhaps someone here can help me, I bought a small GE 120v electric motor for a replacement for a machine. It has 3 three wires (red, yellow,blue) and requires a 10mf capacitor. My best guess was to wire it with Blue to line , red-line & cap, and yellow on the other cap term. But it runs very...

GE motor [ 1 Answers ]

I have a GE motor that I believe is from an old washer. It has 5 wires. Black to white is 0 ohms, red to white or red to black is 3.9 ohms, yellow to blue is 2.0 ohms. There appears to be "no" centrifugal switch, so I don't think it's a capacitor start but with all the wires I think it might be a...

AC Motor [ 1 Answers ]

How Do You Rewire a AC Motor that is used on Conveyors?

Squeaky AC motor [ 1 Answers ]

A chirping noise is coming from my AC unit. I think it is coming from the fan motor. The squeaky chirping noise (sounds like a cricket) kind on cycles so that during a cooling cycle, the fan will go from making no unusual noise to this squeaky chirping noise and then back to no noise again. Do you...

My motor is shaking [ 2 Answers ]

I just took my 91 honda civic for a 5 hour ride yesterday in the pouring rain. About half way in the trip my car started losing speed so I got on the side of the road and turned it off. After 10 minutes of letting it cool off I drove it the rest of the way. Sometimes it would lose speed/other times...

View more questions Search