Re: Connecting a 6-Wire, Unmarked 3-Phase Motor for Saw - Grandfather's Barn Find

Hello.
I found a large 3-phase motor in the barn. It has no markings, 6 wires stick out of it, grandma said that once my grandfather turned it on and he could not connect it.
I would like to use it again for the saw, but I have no idea how to connect it to 3 phases? I have the entire electronic service and there will be no problems with traversing the windings.

Send me a photo of the cube (can) with these 6 wires, we'll do something for sure, you need to connect it in a star or a triangle (put bridges appropriately). Also, take a photo of the engine with, for example, an A4 sheet of paper in advance, we will assess its approximate power.

Hello
The easiest way to connect into a star. To do this, the ends must be joined
windings together - 3 wires, and the beginnings to the phases, the beginnings and the ends are mostly somehow grouped or separated from each other.
If in a triangle, connect: the end of the first phase with the beginning of the second phase, the end of the second phase with the beginning of the third phase, and the end of the third phase with the beginning of the first phase.

Send a picture, we will advise you I am an electrician, I repair engines on a daily basis, so it will be fine, grandma will hear him walk

If 6 wires protrude from it, one bundle is for star connection and the other for delta connection. Mechanical switches were added to such motors to switch only the phase between the bundles and there was no need to combine and switch anything from the outside. Without such a switch, you will probably not use it because when you try to start, the inrush current will blow the fuse (when connected in a delta) and the star will consume a huge amount of electricity - I know because I connected these with my parents in a hay blower and everyone had a puzzle how to start it.
Regards

It will be difficult with the photo, because I'm going to see my grandma in about 2 weeks, so I would like to start it now, unless nothing comes up, then I will take a photo and post it on the forum. The front ones stick out loosely, from what I remember they are 3 pairs of 2 wires together. I am afraid that it will not be possible without a photo, because I will rather not detect the beginning of the winding with the meter.

Jasie-k wrote:

If 6 wires protrude from it, one bundle is for star connection and the other for delta connection. Mechanical switches were added to such motors to switch only the phase between the bundles and there was no need to combine and switch anything from the outside. Without such a switch, you will probably not use it because when you try to start, the inrush current will blow the fuse (when connected in a delta) and the star will consume a huge amount of electricity - I know because I connected these with my parents in a hay blower and everyone had a puzzle how to start it.
Regards

DEFINITELY?

I had one, and it is terribly big, so I'm sure. When in doubt, a photo may help.
It's only possible that I twisted the star with the triangle, but nothing more.


Hell, there is a large inrush current in the triangle
Regards.

Hello. A lot of posts, but I suspect that with their help this engine will not start. I suggest that you do this: You have six wires coming from the engine, these are the ends and beginnings of the coils. First you need to find the windings of the three phases using, for example, an ohmmeter or just a light bulb and battery . When you find three windings, you need to find their ends and beginnings, and you can easily get a battery, e.g. 9V and a DC voltmeter. Connect a voltmeter to the ends of one winding and connect the battery to the ends of the other winding with short pulses. We connect the battery poles in such a way that the voltmeter pointer tilts forward and the tip to which was connected the plus of the battery and the plus of the voltmeter we assume that these are beginnings. three phases and we know where their beginnings and ends are, now we need to connect them properly we can live in a star or a delta. If it is a motor with a power greater than 5KW, you should use a star-delta switch

Hello everyone, I apologize in advance for reheating the cutlet, but I have a similar problem to the author of the thread, I have a 3kw engine from my father, it is functional, I have a switch, all from the 60s, I have a problem with connecting the engine with the switch.
Before his death, my father wanted to do it, but he only unmounted the cables and after a short time he died and after 6 years he wants to do it, I count on all the help.
plate data:
Induction motor M8 SZJE46B 3KW
220 / 380V
? / ?
11.2 / 6.5A
cos? 0.86
945 turns
1964 year of production
60 kg
from what I remember, a 3-core cable went from the engine to the switch (some cable is also mounted to the housing - under the nameplate).
the engine is started by turning the switch twice
I will insert photos, when I forgot to add something, please feel free to write
first photo of the switch - position 0
second photo - first twist (start up ???)
third photo - second twist (work)
greetings

This switch is nice for a museum, the motor is now star-shaped and is meant to stay that way. It would be nice to measure his insulation condition. If you want to connect it to a switch, buy a new 0-1 motor, it is not big so 16 Ampere is enough.

the switch is a museum - yes, but 100% functional
for this particular engine how to buy a switch - something on the Allegro is interesting?

3.1.18. Do not send links that will cease to be active after some time. This will make the discussion meaningless.

I am also interested in connecting the motor, which color under u, v and w does it matter?
an electrician friend called PLN 50 for connection.
I'm interested in connecting the motor with a switch, step by step

It does not matter the colors, except for the yellow and green that goes to the motor housing, the protective conductor and buy a cable without a blue color.

OK I understand
there was an old wire between the engine and the switch (I have it), it has 3 colors: black, brown and blue
was it the wrong cable? because there was no yellow and green.
was this yellow-green one taken from the plug or what is it like?
I have an engine where yellow green is in the can and there is no problem there

Quote:

there was an old wire (I have it) has 3 colors: black, brown and just blue

If it is old rubber, it is better to throw it away - the condition (resistance) of the insulation may be too low and it will be dangerous, especially when it is rotten.

facetzewsi wrote:

was it the wrong cable?

This is a bad cable because you need 3 phases and a 4 protective conductor to power the motor.
Here is a (handwritten) diagram of such a power supply to a motor with a motor breaker as overload protection and your 0-1 breaker.

Jasie-k wrote:

If 6 wires protrude from it, one bundle is for star connection and the other for delta connection. Mechanical switches were added to such motors to switch only the phase between the bundles and there was no need to combine and switch anything from the outside. Without such a switch, you will probably not use it because when you try to start, the inrush current will blow the fuse (when connected in a delta) and the star will consume a huge amount of electricity - I know because I connected these with my parents in a hay blower and everyone had a puzzle how to start it.
Regards

What bullshit!

Thanks for the diagram.
Anyway, I have to buy 1 three-core cable and 1 one-core 2.5mm2 or 4mm2 (protective)
because he is coming from under the nameplate, not from the tin. I'll secure it with a tube
and probably so much in the subject. I understand that I can also use an L-0-P switch (left-right rotation).

Discussed a thousand times, I close.