Six wire- two speed motor
Six wire- two speed motor
(OP)
Hello all. This is my first post so bear with me. Recently I have been promoted to a lead person job and fill in when my Supervisor is out. This past week one of the shop personnel went out to install a newly rewound motor and could not get it to work right. He said it sounded like it was single-phasing.
We ended up taking the original motor back to the shop and repairing the damaged shaft, which was the reason why it was taken out in the first place, and fixing that.
Meanwhile I had them bring the motor in question back to the shop for some experimenting. When I called the motor repair facility, they claimed the motor should be fine, and to check with my Supervisor to see how to hook it up. That was not possible at that time.
The shop guys were able to get the motor to run by shorting 3 leads together and using the other 3 as the phase leads. But have been unsuccessful in getting a 2 speed effect.One of them mentioned something about a "consequential pole" but was unsure if this was the case.
My main forte' is machining and welding, but I have taken alot of electrical courses and from what I see it is a matter of utilizing a different set of poles to get the desired speeds and it shows that in the original prints. I know the fewer poles, the faster the motor will run, trying to play catch up with the rotation of the fields.
Now when we received this motor it had markings 1 thru 6 on the wires, but no indication as to how they are connected.
Its either this motor will only have 1 speed or it hasn't been rewound right for the intended use as required by the manufacturer.
Does anyone here know if it is possible to derive 2 speeds from this motor?? Thanx.
We ended up taking the original motor back to the shop and repairing the damaged shaft, which was the reason why it was taken out in the first place, and fixing that.
Meanwhile I had them bring the motor in question back to the shop for some experimenting. When I called the motor repair facility, they claimed the motor should be fine, and to check with my Supervisor to see how to hook it up. That was not possible at that time.
The shop guys were able to get the motor to run by shorting 3 leads together and using the other 3 as the phase leads. But have been unsuccessful in getting a 2 speed effect.One of them mentioned something about a "consequential pole" but was unsure if this was the case.
My main forte' is machining and welding, but I have taken alot of electrical courses and from what I see it is a matter of utilizing a different set of poles to get the desired speeds and it shows that in the original prints. I know the fewer poles, the faster the motor will run, trying to play catch up with the rotation of the fields.
Now when we received this motor it had markings 1 thru 6 on the wires, but no indication as to how they are connected.
Its either this motor will only have 1 speed or it hasn't been rewound right for the intended use as required by the manufacturer.
Does anyone here know if it is possible to derive 2 speeds from this motor?? Thanx.





RE: Six wire- two speed motor
Click on EASA Handbook (it's near the center of the page halfway down)
Click on "Term. Marking-Conn. 3Ph Mtrs-Two Speed-Single Winding"
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RE: Six wire- two speed motor
A more direct link to the same info as above:
http:
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RE: Six wire- two speed motor
Constant Torque 2 Speeds. The HP shown on the nameplate are in the ratio of ½, if so, connect:
LOW SPEED ( Lower HP)
Line 1 to motor Terminal 1
Line 2 to motor terminal 2
Line 3 to motor terminal 3
Leave motor terminals 4,5 & 6 open and insulated from each other. This connection is 1 circuit Delta.
HIGH Speed (Higher HP)
line 1 to motor terminal 6
Line 2 to motor terminal 4
Line 3 to motor terminal 5
Short circuit 1,2&3 (neutral) this connection is 2 Wye.
Constant Horsepower 2 Speed. The HP shown on the nameplate are the same for both speeds, connect:
LOW SPEED
Line 1 to motor Terminal 1
Line 2 to motor terminal 2
Line 3 to motor terminal 3
Short circuit motor terminals 4,5 & 6 to make the neutral. This connection is 2 circuits Wye.
HIGH Speed
Line 1 to motor terminal 6
Line 2 to motor terminal 4
Line 3 to motor terminal 5
Leave motor terminal 1,2&3 open and insulated from each other. The connection is 1circuit delta.
RE: Six wire- two speed motor
Anyway I'll keep you guys up to date on what the end result is but, I think its beginning to look like the motor may have been wired right after all. Ballpeen.
RE: Six wire- two speed motor
Look for some wiring diagram on the motor nameplates. Yes if the motor is connected on 60 HZ supply the speeds will increase proportional to the frequency increase.
Be careful since the motor performance changes when the frequency supplied is not that specified on the motor nameplate.
RE: Six wire- two speed motor
In a Dahllander connection we can find three different kind of two speed motors (With only one winding):
Constant Horse Power: Same Horse Power at Both Speeds.
Speed L1 L2 L3 Comments Connection
High 6 4 5 1&2&3 Open 1 Delta
Low 1 2 3 4-5-6 Join 2 Wye
Variable Torque: Low horsepower is One-Fourth of High Speed Horse Power.
Speed L1 L2 L3 Comments Connection
High 6 4 5 1&2&3 Join 2 Wye
Low 1 2 3 4-5-6 Open 1 Wye
Constant Torque: Low Speed Horse Power is Half of High Speed Horse Power.
Speed L1 L2 L3 Comments Connection
High 6 4 5 1&2&3 Join 2 Wye
Low 1 2 3 4-5-6 Open 1 Delta
Comments:
1. I think your shop most send a Wiring diagram each they perform a repair in special motors.
2. Check if your electricians needs to know more about this special motors.Try with the shop some course about it.
3. Did you check if the name plate is installed on the motor? Usually the connection diagram is showed by the name plate.
Regards
Petronila
RE: Six wire- two speed motor
RE: Six wire- two speed motor
RE: Six wire- two speed motor
If the motor hums on high speed when the shaft is free (no load) the winding is wrong.
The thermal protector is an option and does not afect the magnetic performance as far as the windings are correct.
Two speed starters make the required connection when the six motor leads are connected to the corresponding ports of the starter.
RE: Six wire- two speed motor
Your wye wye/delta on the nameplate would suggest that either the constant HP or constant torque connection will make it work. You never told us which connections made it work.
RE: Six wire- two speed motor
RE: Six wire- two speed motor
If the name plate said wye wye/delta then this is a Two Speed one winding Torque Constant Motor:
Constant Torque: Low Speed Horse Power is Half of High Speed Horse Power.
Speed L1 L2 L3 Comments Connection
High 6 4 5 1&2&3 Join 2 Wye
Low 1 2 3 4-5-6 Open 1 Delta
I think the motor could be fine but when your electrician made the Connection could perform a standard type:
Standard Wye 6-4-5 join and L1-- 1, L2-- 2, L3--3.Then the motor is wrong connected.Good Connection : High L1-6 l2- 4 l3-- 5 1&2&3 Join 2 Wye
Standard Delta L1-- 1&6, L2-- 2&4, L3-- 3&5 and is wrong conected too.Good Connection : Low L1- 1 L2- 2 L3- 3 4-5-6 Open 1 Delta
This could explain why the motor don´t work proper.
Regards
Petronila
RE: Six wire- two speed motor
No.82821/073 Typ.160W- 4/2F.6.2-03
3 phase S1 6.2/ 2.5 Kw
480 YY/? Volts 9.8/ 4.85 Amps
1770/ 3550/ min. Cos.? 60 Hz.
IS. KL. F IP54
PTC 130 Grad. C
ID 384033
Now with this motor hooked up with the test leads it will turn at the slow speed no problem, at the higher speed it will only turn at about an estimated 100 to 200 RPM's. when starting from a stop and with no load,and is quite noisy as was stated. One thing that did have to be done was, the wire markings had to be reversed in order to get the motor to run properly....... It has been taken back in preparation for use the next time it is needed, so we'll see. I hope this is enough info. because its all I can give you on this particular motor. Ballpeen.
RE: Six wire- two speed motor
In your first post you talk about the motor was rewound and you could not get it to work right and sounded like it was single-phasing. The above name plate belongs to one single winding/Two speed motor. This special motors have 6 wires and depending of the connection could run at high or low speed at only one voltage, in your case the high speed is 3550 and the low is 1770 RPM. and the main voltage is 480 V. The motor was manufactured by LANDERT MOTOREN AG from EUROPEAN (Swiss ).The problem could come from two sources: 1. Motor wrong rewounded, in this case the work shop did not made a good internal connection on the winding.
2. Incorrect external connection, in this case your electrician made wrong connections.
In my last post I was send all information about the NEMA external electrical wiring for this motor but taking acount this is a swiss motor here are the IEC Connection:
SPEED L1 L2 L3 COMMENTS Connection
High 2w 2u 2v 1u-1v-1w Join 2 Wye
LOW 1u 1v 1w 2u-2v-2w Open 1 Delta.
Best Regards
PETRONILA