Identify stepper motors

[antonioan]

Hi.

A few days ago two slightly old stepper motors that I cannot identify came into my hands.
The following information appears on their label:

ROTARY DIGITAL ACTUATOR
TYPE MSCKB27B12 (The first) MSCKB27B11 (The second)
GRATIO 5.56 VOLT 24 OHM 100 (The first) GRATIO 5.56 VOLT 24 OHM 100 (The second)
SABKYO JAPAN

How can I tell if they are unipolar or bipolar? How can I know its electricity consumption?
Both motors have 6 wires.

Thanks. Regards.

[JCA34F]

Do you have an Ohm meter? What are the wire colors?

[antonioan]

Hello.

I haven't an Ohm meter.
This is the wire colors:

Regards.

[oldcurmudgeon]

With 6 wires it is probably unipolar. The white wires may be the coil center taps. The other colors would then be the ends of the coils. Without an ohm meter it is difficult to tell how they are connected.

[antonioan]

I've got an ohm meter. I get resistance values ​​on the following pairs of wires:

White (the first) - purple
White (the first) - blue
White (the second) - yellow
White (the second) - orange

It seems that a coil would be white (the first) - purple - blue, and the other white (the second) - yellow - orange.

But I found something strange. I am not getting resistance values ​​between the purple and blue wires, nor between the yellow and orange wires. Can this be correct?

Can the engine be identified with these results?

Thanks for your help. Regards.

[JCA34F]

Fill in the blanks.

METER
BLACK     METER     RED     PROBE  (OHMS)
PROBE
          BLU     YEL    VIO    WH1    WH2

OR       ____    ____   ____   ____   ____
   
BLU              ____   ____   ____   ____

YEL                     ____   ____   ____

VIO                            ____   ____

WH1                                   ____
     

[oldcurmudgeon]

The motor has two center tapped coils. The sequence in which they are activated controls the motion.

After filling out the chart suggested above you can figure out the coil connections. The resistance between the pairs of colored wires for a coil should be twice the resistance between a colored wire and the white wire of the coil. White wires should be the center taps.

[antonioan]

I have done the measurements just as you told me. The result is as follows:

Non-zero values ​​are approximate. Is it possible for the motor to have the coils as they appear in the following diagram?

Thanks again. Regards.

[JCA34F]

180Ω seems high, for a 6 wire stepper I was expecting something like this, now I'm not sure what you have.

[MarkT]

0 means shorted together, so that's clearly not correct, and you missed yellow-violet reading too.

What makes you think this is a stepper motor BTW? And which of the 3 devices you mentioned are you measuring?

[bobcousins]

Given the resistance readings, something doesn't add up. There should be a reading between blue and violet if it is a stepper. The description implies it is 100 Ohms, or possible 24 Ohms, I have no idea what "GRATIO" means.

Maybe it is a DC motor with encoder output? You haven't shown us the motors, which might be useful.

[jim-p]

@antonioan

GRATIO 5.56 VOLT 24 OHM 100

GRATIO is the gear ratio so it 5.56
VOLT is 24 Volts
OHM is 100 ohms

So you should be reading either 50 ohms, 100 ohms or no resistance (not zero) when you make the resistance maesurements.

[antonioan]

I will try to answer everything you ask me.

First of all, I tell you that I don't have much experience in electronics, so I may have made some mistakes.

The motors appeared in a box that a friend gave me among many other things. Its origin is unknown. At first glance they look like stepper motors, but I could be wrong. I show you an image
of them.

In the messages that I have posted before there are two errors: the first is that in one motor it says 100 Ohm and in the other it says 175 Ohm; the second is that I forgot a zero in the measurement of the yellow-violet pair.

I don't know if I have done the measurements correctly, I have already said that I don't understand much about this.

When I turn on the Ohm meter, without connecting it to anything, the display reads 100 Ohm. I get this same reading when I measure between two terminals that "are not connected", for example between yellow and violet. This is what I have noted as zero, but I imagine the correct thing would be to say "no value."

When I measure between "connected" terminals, I get the following values:

These values ​​are approximate, since the measurement fluctuates a lot.

I hope I have answered your questions. Regards.

[Paul_KD7HB]

Just by looking at the picture, you can see they are not identical devices. The mounting ears are on the same side as the gear for one motor and just the opposite for the other device. The gears see identical are for use with a rubber toothed belt.

added: I used Google lens to see if I could find something similar. Did not. The only motor, stepper, with an offset shaft was a stepper with a 30/1 gear reduction. Your motors have gear reduction, whatever they are.