Bipolar Stepper motor spec.[SOLVED]

Other Hardware Motors, Mechanics, Power and CNC
1

Hi.

I salvaged one Bipolar Stepper motor 4 wires. I got success to test it with some code and a HG7881 (L9110) Dual Channel Motor Driver Module, with no problem, and running smoothly.
But I couldn't find any info about specification.

Steps per revolution ??
Current rating ??
Voltage rating ?? pretty sure it's 12v, but could be 5v ( it was part of a verrrrry old hard-disc )
Size: 39 mm square × 26 mm

Only visible label on it with this info: 4h4009s-0412, and with bigger code: 67C, Sinano Electric ( the " h " of shinano is not printed ).
Over sHinano web site iI could find some very similar, but none with this code.

Any info, or link to info is wellcome.

stepper_sin.jpg

2

If you can make it move you can count the steps per revolution.

Measure the resistance of the coils.

...R

3

Hi;
Its a 12V motor.
http://www.elektronvl.szm.com/motorlist.html

That is all I could get from Google.

Tom.... :slight_smile:

4

Robin2:
If you can make it move you can count the steps per revolution.

Measure the resistance of the coils.

...R

Thanks for the tips.

For counting steeps I just wrote a code and using a 16x2 LCD to count. I will mark the axis and try to stop the motor close to the last steep.
I tried it manually with my fingers. I was able to do it until 1/4 revolution. I could count a lot of steeps, and I'm pretty sure I missed some. :slight_smile:

Coil resistance are 23.5 ohm.
So If I remember my old days at school:

I = V / R, shoud be 0.510 amp

As user TomGeorge was found, it's a 12 vts motor. Running more than 30mns with 12v powered, didn't overheating at all

5

TomGeorge:
Hi;
Its a 12V motor.
http://www.elektronvl.szm.com/motorlist.html

That is all I could get from Google.

Tom.... :slight_smile:

Thanks a lot.

It was same here, only found this location: size, weight and voltage and usage ( HDD motor ) and Slovenian language is not on my list :slight_smile:

6

arssant:
For counting steeps I just wrote a code

Make it do a fixed number of steps - 200 is a good place to start - and see if it does an exact 360o rotation. If not, change the number.
With a current requirment of about 0.5 amps you could use a Pololu A4988 stepper driver.

Have a look at stepper motor basics and this simple stepper code.

...R

7

Robin2:
Make it do a fixed number of steps - 200 is a good place to start - and see if it does an exact 360o rotation. If not, change the number.
With a current requirment of about 0.5 amps you could use a Pololu A4988 stepper driver.

Have a look at stepper motor basics and this simple stepper code.

...R

Thanks again for suggestion.

The 30 mms test was with this a4988 stepper driver. Previously was with a L9110.
I just finished to test it with 200 steps, and it turns CW and CCW for 180º, so I assume that is a 400 steps, maybe 402 because the maker was just nearly 179º than 180, before turning backward.

8

400 is common. I have never heard of 402.
Make sure your driver is doing full steps and is not microstepping x2.

...R

9

Robin2:
400 is common. I have never heard of 402.
Make sure your driver is doing full steps and is not microstepping x2.

...R

Again... thanks for your time.

You are right, it's a 400 steps per revolution. My code was bad, only counting 199 for CW and after going CCW. I tried your basic code, and now I got half revolution with 200 steps, and full with 400.
The driver is on full steps mode according with data-sheet.