Can't find the Y connection

[raw raw]

Can not find a Y connection on my 3 phase motor.

I have been following the instructions by Zubby in his Aug 13 post but cannot find the Y connection on the # 7 lead nor for #9 lead. I have not looked for the Y connection on the #8 lead wire. I followed the leads right down to the stator slot. There is no Y connection. This motor has 36 slots in the stator. The rotor is 4" in diameter and 3 and a quarter inches long. I did a continuity test on the nine leads. Here are the connections. 1-4, 2-5, 3-6, 7-8, 7-9, 8-9. From this it appears that leads 7, 8, 9, are the Y points. Is it possible the Y connections are on the other end of the stator? Here is the motor that I have.

Lealand Newman Motor

Manufactured in England by Newman Industries Ltd. For Lealand Electric Canada Ltd.

Frame A184EC1422BB    HP.  1.6

RPM 1800   Cycle 60   ph  3

Duty  Cont.   Code K

Volts 440   Amps. 2.45   Temp 55

Volts  208/220 Amps. 4.9

No.432902    Design B

Low voltage                  High voltage

T6--T5--T4                      T6   T5   T4

                                          |      |       |

T9    T8   T7                     T9   T8   T7

|         |      |  

T3    T2   T1                      T3   T2   T1

 |       |       |                          |      |        |

A question for Zubby or anyone. Is this a motor that I cannot bring out the extra three leads for the Y connection? Could this be a Delta only motor without Y connections or do I just not know how to find the Y connections? Is this motor still suitable for a wind generator at 24 or 48 volts. For this higher voltage is there any advantage in bringing out the extra 3 leads? I am planning to use a piece of 4" aluminum irrigation pipe to hold the magnets in place. I will need to put a piece of the pipe inside the outside piece to get enough thickness.

 I also have a 10 HP 220/440 3 phase motor. I wish to convert. I had planned on doing the smaller motor first to gain experience. Since I cannot find the Y connection would I be wise to do the 10 HP motor? I can use the extra power. I plan to use an oil well drill stem for the tower. Has anyone used a drill stem? I sure like Zubbie's instructions. They are very clear. Thanks Zubbie. We love your work.  Ray

[bob g]

i had this explained to me by my favorite motor rewinder a while back,

what you have is a motor made for US use, and as such has no external wires 10,11 and 12

this connection is made internally, and is likely done, wrapped and dipped in the stator.

you will have to hunt for the connection, and if you want the 10, 11 and 12 wires, make the necessary connections and bring them out.

for my application, i don't need to seperate them, but i do need to connect to the junction and bring it outside the case

12 wire 3 phase motors are what is referred wo as "world" motors, as they can be configured for anyones use

bob g

[raw raw]

Thanks bob for the information. I have dug around on the end of the stator where the 9 wires are removing the insulation and tracing the wire right down to the stator slot. I cannot trace the wire any farther. This is the reason I thought the Y might be on the other end of the stator. I don't know where else to look. having the Y on the other end of the stator doesn't make any sence to me.  Ray

[zubbly]

Hi Raw Raw!

you do have an internal Y connection. just to try and make it a little clearer, you have 9 motor leads brought out from the winding. for your 220 volt connection, you join 4+5+6, "plus you also have an internal Y point that is tied into the winding. so what you really have is a 2 Y connection. one made internally without any lead wires on it and burried in the winding, and one made externally with  lead numbers 4+5+6.

for your 440 volt connection, you already have a star point in the winding, and the rest of the leads are used to connect to power and to make the series connection in each phase.

what to look for:

you will "not" see the star connection by following any of the leads down to the winding. if you can, very carefully remove all the tie cord without nicking any of the winding. but first, see if you can spot the internal star and just remove the tie cord in that spot. usually motors are wound with a type of "sleeving" or some call spaghetti, that is used to protect the magnet wire because it crosses and lays across all the 3 phases. most of the sleeving is for jumpers, where it just comes from one spot to another or from a coil to a motor lead wire.

what you will look for is the sleeving coming from 3 different spots and joined together. where the joint is made is usually covered with a piece of sleeving that is bigger. that is the internal "Y point".

you must cut the soldered connection and clean the ends of the magnet wire so it can be traced to the motor lead wires numbers 7, 8, and 9. from motor lead #7 to one of the magnet wires of the opened star point is lead #10. from motor lead #8 to one of the magnet wire is #11, and lastly from motor lead #9 to the last magnet wire is #12.

after you have attached the 3 lead wires numbers 10, 11, and 12, use some cotton tie cord to re-tie the winding and brush with a little varnish.

now you can make your 1 and 2 circuit connections in either star or delta.

hope this helps  

zubbly

[raw raw]

Thanks Zubby. You have made it plain. You came to my rescue.  Ray