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Delta vs Wye motor connections

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    #16
    Obvious:

    Obviously, you can wire the split windings in series or in parallel. Same flux, same coil currents, twice the line current at half the voltage.
    Don't mess with B+!
    (Signal Corps. Motto)

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      #17
      When I said "the low voltage connection isn't quite so obvious" I wasn't implying that I didn't know how to do it. I was just saying "it isn't quite so obvious as the high voltage connection."

      One way to look at the low voltage connection is that we are creating three open deltas.... not that we actually are, but going from my diagram, the LV connection would appear to be three open deltas.
      IBEW LU 716

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        #18
        Originally posted by mull982
        So if I have a 6-lead 480V motor that I want to put on my system I have an option of how I connect this motor either wye or delta?
        No, if you have a 6-lead 480v motor, you have the option of 240v or 480v, but it will remain wye or delta. A 9-lead motor is actually a 12-lead motor with one connection point inaccessible.

        To switch a motor between wye and delta, you need all of the winding ends individually accessible, which means it will be a 6-lead, single-voltage motor, or a 12-lead, dual-voltage motor.
        Master Electrician
        Electrical Contractor
        Richmond, VA

        Comment


          #19
          Originally posted by LarryFine
          No, if you have a 6-lead 480v motor, you have the option of 240v or 480v
          I am missing something here. Can a six lead 480v motor also be connected for 240 volts?
          IBEW LU 716

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            #20
            Connections

            here is a bunch of motor connection dwgs i ran across awhile back

            http://www.usmotors.com/Connections/Connections.htm

            enjoy
            Why is it, when it comes to the NEC, the obvious is never simple and the simple is never obvious?

            Comment


              #21
              Originally posted by crossman
              When I said "the low voltage connection isn't quite so obvious" I wasn't implying that I didn't know how to do it. I was just saying "it isn't quite so obvious as the high voltage connection."

              One way to look at the low voltage connection is that we are creating three open deltas.... not that we actually are, but going from my diagram, the LV connection would appear to be three open deltas.
              Crossman, redraw your diagram and let the windings overlap about halfway but not connect. That should be obvious.
              Don't mess with B+!
              (Signal Corps. Motto)

              Comment


                #22
                Okay, let me rephrase the whole thing.

                It is obvious to me how the low voltage connection is made, just as it is obvious to the remainder of the astute observers on this forum. However, the low voltage connection is not quite so obvious to the average third year apprentice that I may come into contact with.
                IBEW LU 716

                Comment


                  #23
                  Originally posted by rattus
                  Crossman, redraw your diagram and let the windings overlap about halfway but not connect. That should be obvious.
                  Oh, you mean like the sketch I attached to post 7.

                  Crossman -
                  You really didn't need to rephrease. I think most of us got it that you knew.

                  carl
                  Using the code for a design guide is a sign of incompetance

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                    #24
                    Carl, I appreciate your confidence!:smile:
                    IBEW LU 716

                    Comment


                      #25
                      Originally posted by billsnuff
                      here is a bunch of motor connection dwgs i ran across awhile back

                      http://www.usmotors.com/Connections/Connections.htm

                      enjoy

                      I just wanted to say thanks, for the link. Very informative!:smile:
                      [COLOR="DeepSkyBlue"]Luke[/COLOR]

                      Electrical Planner for TVA

                      Comment


                        #26
                        Originally posted by LarryFine
                        No, if you have a 6-lead 480v motor, you have the option of 240v or 480v, but it will remain wye or delta. A 9-lead motor is actually a 12-lead motor with one connection point inaccessible.

                        To switch a motor between wye and delta, you need all of the winding ends individually accessible, which means it will be a 6-lead, single-voltage motor, or a 12-lead, dual-voltage motor.
                        Let me summarize what I think I understand

                        1) If I have a 3 lead motor I do not care weather it is wired for wye or delta.
                        For instance if I have a 480V motor then I dont care how its wired, and if
                        its wired in a wye configuration then although the voltage across the coils
                        will only be 58% the motor manufacturer has already accounted for this
                        for the motors proper operation.

                        2) If I have a 6-lead dual voltage motor, such as 480/240 for example then it
                        will be either delta for both voltages, or wye for both voltages and is not
                        meant to be swapped between delta and wye for different voltages.

                        3) If I have a 6-lead single voltage motor such as a 480V motor then there is
                        an option weather to wire it for wye or delta. There is also an option for
                        wiring this type of motor for a wye-start, delt-run configuration. You have
                        to keep in mind however that in the wye configuration there will only be
                        58% of the voltage across the coils. What is a case where I would want
                        to run a motor in the wye configuration with a particular system voltage
                        avaliable?

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                          #27
                          Unless, I'm missing something, I'd say you've got it.
                          Master Electrician
                          Electrical Contractor
                          Richmond, VA

                          Comment


                            #28
                            Would someone be so kind as to draw the windings of a six-lead dual-voltage (as in 480/240) 3 phase motor? I am missing how it can be done.
                            IBEW LU 716

                            Comment


                              #29
                              Originally posted by crossman
                              Would someone be so kind as to draw the windings of a six-lead dual-voltage (as in 480/240) 3 phase motor? I am missing how it can be done.
                              You think they meant to say 480/277 wye/delta?
                              BB+/BB=?

                              Comment


                                #30
                                Originally posted by crossman
                                Would someone be so kind as to draw the windings of a six-lead dual-voltage (as in 480/240) 3 phase motor? I am missing how it can be done.
                                Can't be done with a voltage ratio at 2:1, but at 1.732:1 it can be!

                                For example:
                                Last edited by Smart $; 04-15-08, 11:26 PM.
                                [COLOR=RoyalBlue]I will have achieved my life's goal if I die with a smile on my face.[/COLOR]

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