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motor wiring

  • 15-06-2013 10:16pm
    #1
    td5man
    Registered Users, Registered Users 2 Posts: 3,081 ✭✭✭


    Can this motor be connected to single phase supply.


Comments

  • #2
    crazy_kenny
    Registered Users, Registered Users 2 Posts: 413 ✭✭crazy_kenny


    What motor?


  • #3
    td5man
    Registered Users, Registered Users 2 Posts: 3,081 ✭✭✭td5man


    crazy_kenny wrote: »
    What motor?

    Tried to attach picture but didn't work.
    Its a 1hp motor 240v delta with 6 wires in the junction box.


  • #4
    crazy_kenny
    Registered Users, Registered Users 2 Posts: 413 ✭✭crazy_kenny


    td5man wrote: »
    Tried to attach picture but didn't work.
    Its a 1hp motor 240v delta with 6 wires in the junction box.

    That's a 3 phase motor


  • #5
    td5man
    Registered Users, Registered Users 2 Posts: 3,081 ✭✭✭td5man


    crazy_kenny wrote: »
    That's a 3 phase motor

    Why does it say 240v on the plate?


  • #6
    crazy_kenny
    Registered Users, Registered Users 2 Posts: 413 ✭✭crazy_kenny


    td5man wrote: »
    Why does it say 240v on the plate?

    The line voltage will be 240 v connected in delta


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  • #7
    adrian92
    Registered Users, Registered Users 2 Posts: 566 ✭✭✭adrian92


    If it has six terminals, I agree that it would seem to be a three-phase motor.

    I do not know if the connections can be make to operate on single phase - I think not though.

    You said it was rated output of 1 HP - that would be approx. 0.75kW - I am surprised that such a small motor would be three-phase. Are you sure it is only 1 HP.


  • #8
    frankmul
    Registered Users, Registered Users 2 Posts: 378 ✭✭frankmul


    Could be a motor designed to be run on from a single phase to three phase inverter. The output voltage of the inverter is three phase 230 volts


  • #9
    td5man
    Registered Users, Registered Users 2 Posts: 3,081 ✭✭✭td5man


    adrian92 wrote: »
    If it has six terminals, I agree that it would seem to be a three-phase motor.

    I do not know if the connections can be make to operate on single phase - I think not though.

    You said it was rated output of 1 HP - that would be approx. 0.75kW - I am surprised that such a small motor would be three-phase. Are you sure it is only 1 HP.

    Its a small water pump stamped 1hp,


  • #10
    sparcocars
    Registered Users, Registered Users 2 Posts: 148 ✭✭sparcocars


    You could get a variable speed drive that could get you 3 phase from a single phase supply. It would be an expensive way to go. Might be better off just getting a single phase motor instead.


  • #11
    mikehammer67
    Closed Accounts Posts: 699 ✭✭✭mikehammer67


    i think they're dual voltage if i recall correctly

    240 delta
    400 Y
    3-phase


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  • #12
    td5man
    Registered Users, Registered Users 2 Posts: 3,081 ✭✭✭td5man


    mikehammer67 wrote: »
    i think they're dual voltage if i recall correctly

    240 delta
    400 Y
    3-phase
    Is that 240v 3 phase?


  • #13
    mikehammer67
    Closed Accounts Posts: 699 ✭✭✭mikehammer67


    td5man wrote: »
    Is that 240v 3 phase?

    yes 3-phase


  • #14
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    mikehammer67 wrote: »
    i think they're dual voltage if i recall correctly

    240 delta
    400 Y
    3-phase

    A 3 phase motor with 240v windings will run the same in delta 240v line as in star 400v line, although its actually 230v rather than 240v delta = 400v star. (400/ root3)

    For something with a steady loading, small 3 phase motors can be run from single phase with the addition of 2 capacitors. The best solution here though is likely a single phase motor instead.


  • #15
    mikehammer67
    Closed Accounts Posts: 699 ✭✭✭mikehammer67


    Bruthal wrote: »
    A 3 phase motor with 240v winding

    yes always easier learning from the basics up
    i was mixing the figures up
    he said 240 so that would have been 240 or 415 line voltage on the old system


  • #16
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    mikehammer67 wrote: »
    yes always easier learning from the basics up
    i was mixing the figures up
    he said 240 so that would have been 240 or 415 line voltage on the old system

    Yea I wasn't really pointing out the voltage difference, 230 or 240 is all the one really. Was just mentioning it sort of in passing.


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