Looking for help with winch motor winding data
Looking for help with winch motor winding data
(OP)
We recently recieved a 3 speed 2 winding marine winch motor for rewind in our shop. The motor had been recently rewound at a shop in Russia. The rewound motor never worked properly and actually failed shortly after installation according to the ship's engineer. I have tried to get winding data from the factory but they will not give it out citing proprietary policy.
I have included attachments that describe the motor as well as the winding data that we took out of the motor. I'm hoping someone has seen a similar motor or has information as to how they are able to get 17/86 KW & 2 pole/ 4 pole from the same winding. The 8 pole winding is a separate winding that is controlled by a separate contactor in the controll box.
I have included attachments that describe the motor as well as the winding data that we took out of the motor. I'm hoping someone has seen a similar motor or has information as to how they are able to get 17/86 KW & 2 pole/ 4 pole from the same winding. The 8 pole winding is a separate winding that is controlled by a separate contactor in the controll box.





RE: Looking for help with winch motor winding data
Unfortunately, I do not see any winding data in your attachment.
Zlatkodo
RE: Looking for help with winch motor winding data
RE: Looking for help with winch motor winding data
RE: Looking for help with winch motor winding data
Do you have any information what are the no-load or full-load currents for this internal connection?
Zlatkodo
RE: Looking for help with winch motor winding data
RE: Looking for help with winch motor winding data
RE: Looking for help with winch motor winding data
2 / 4 pole diagram for this particular case should look as shown in the attachment.
This diagram you need to compare with this one what you found , and then decide whether it will apply or not.
My calculation shows that the number of turns (3 turns / coil) is OK for this winding.
But for the 8 pole winding I get a bigger difference.
Therefore I need some more explanation.
Whether you're (at the first inspection of the defective motor), found which coil is faulty (8 pole or 2 / 4 pole)?
You must know that the calculations are made for continuous operation (S1). Here it is not the case, because the motor is designed for S2 and both windings can be more or less overloaded.
Zlatkodo
RE: Looking for help with winch motor winding data
RE: Looking for help with winch motor winding data
RE: Looking for help with winch motor winding data
RE: Looking for help with winch motor winding data
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Looking for help with winch motor winding data
2. - Do you have the possibility to check what is the switch-combination in place where the motor is running? At what speed is achieved star-point?
Without new informations, I doubt that you will solve this problem. This winding can be any (maybe 3 separate windings, also).
Zlatkodo
RE: Looking for help with winch motor winding data
I have two questions:-
1/ How does the customer know it was wound with incorrect data?
2/ Why isn't the shop who wound it taking responsibility?
desertfox
RE: Looking for help with winch motor winding data
That's odd.
Muthu
www.edison.co.in
RE: Looking for help with winch motor winding data
Muthu
www.edison.co.in
RE: Looking for help with winch motor winding data
I deduced that according to zlatkodo's 2/4 pole diagram, the 4 pole winding could be overheated. Because this is only a single-star (1 path parallel) to carry the full 155A current. I don't know what size are #15 and #16 wires, but I guess the current density could be too high.
RE: Looking for help with winch motor winding data
A lps for thinking out of the box.
Muthu
www.edison.co.in
RE: Looking for help with winch motor winding data
Given that the manufacturer's information is unknown, now is the question what type of winding is suitable for such a facility. Maybe it's not 1Y/2Y, maybe is 1D/2Y or three separate windings, or maybe.....? To much "maybe" and "if" !!!
Therefore I repeat my earlier question:
1. - Is there more information on the motor-nameplate?
2. - Do you have the possibility to check what is the switch-combination in place where the motor is running? At what speed is achieved star-point?
By the way:
Note that in 1Y/2Y connection low-speed HP is only 1/4 high-speed HP, not 1/2.
Zlatkodo
RE: Looking for help with winch motor winding data
Muthu
www.edison.co.in
RE: Looking for help with winch motor winding data
Coil Pitch - 1 to 9
Turns per coil - 3
Long jumpers (coil group 1 to coil group 7)
***********************************************
2 pole Delta winding (bottom winding)
Coil Pitch - 1 to 17 (2/3rd pitch)
Turns per coil - 4
Winding circuits per phase - 2 in parallel
Muthu
www.edison.co.in
RE: Looking for help with winch motor winding data
The ship engineer says the controls are set up so that the 8 pole is on one set of contactors and the 2 pole /4 pole on another other set.. I'll try to get a copy of the control schematic and post it.
Our initial assumption also- The 4 pole/8 pole must be one winding and the 2 pole the other.
The 8 pole winding is positioned closest to the rotor.
I don't know why the motor shop that did the original rewind is not being held responsible for rectifying the problem.
Zlatkodo is correct when he states that the HP ratio is 4-1 with a 2-1 speed ratio when using the VT connection.
RE: Looking for help with winch motor winding data
RE: Looking for help with winch motor winding data
Whether the connection is Y/YY or D/DD is immaterial.
P = kNT. I'm sure the previous rewinder goofed it.
Muthu
www.edison.co.in
RE: Looking for help with winch motor winding data
It is a good decision.
Do not forget to record a no-load currents for all connections. I expect a high values, especially with 8 pole winding. You gotta know that, sometimes in these cases, is a very important one winding relative position compared to other, but this is a specific topic that requires a lot of analysis.
I wish you success.
Zlatkodo