Stepper Motor Specs? (Airpax and Japan Servo Co)

FreezeSukka

I need anyone's help in figuring out the wiring and the specs for 2 types of stepper motors that I just recently purchased.· To be honest, I don't know much about steppers (I know the basics of how they work, just not in depth or an expert by any means) These aren't going into any certain type of project as of yet.· I am just wanting to sort of "play" around and get to know them before I decide what to do with them.· I just can't seem to find out how exactly to wire them.· I have both the Homework Board and the Board of Education (BOE-Bot) and was wondering if both boards can run them or if I should only use a certain one.

Here's what I DO know:

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Airpax Stepper Motor

Four wires (Red, Grey, Black and Yellow)
Volts 2.7
Ohms/Coil 0.97
Step Angle 7.5 degrees
P/N C82902-M2

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KP4M4-029 (Japan Servo Co)

Five wires (Black, Red, Tan, Green and White
Type KP4M4-029
Volts 12
P/N 1298216

Any help would be greatly appreciated!

Thanks - Jeff

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P.S. This is what this part of the alphabet would look like if "Q" and "R" were eliminated.

Post Edited (Jsjga) : 6/21/2005 10:14:23 PM GMT

Aristides Alvarez

Hello,
·
I would recommend you visiting this web site:
http://www.cs.uiowa.edu/~jones/step/
·
It seems that the first motor is a bipolar stepping motor and the second one a unipolar one with the middle point of the coils tied together.
·
The bipolar driver can also handle a unipolar (5 or 6 cables) motor just leaving the middle point of the coils unconnected.
·
After going through that website you'll have all the concepts pretty clear and you should be able to write your own programs. If you want some help or a reference starting point we have some examples in our website that you could use as template (StampWorks for example).
·
Regards,

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Aristides Alvarez
Education and Technical Support Manager
aalvarez@parallax.com
Parallax, Inc. www.parallax.com

FreezeSukka

Thank you very much for your help Aristides. I will check out that website right now! I appreciate all of the help that I can get, I'm still a "rookie" at this thing, and I like the fact that noone in this forum treats you as such. I guess everyone has to start somewhere!
Have a great day,
Jeff

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P.S. This is what this part of the alphabet would look like if "Q" and "R" were eliminated.

kelvin james

I have some info here, i will see if i can upload them.

kelvin

Tricky Nekro

The stepper motors which are in a CD-ROM are biopolar or unipolar motors ( I think they have sensors too) I have many of them and I'm intrested in buying a driver, what about the Parallax's one??? What's more is there any luck of using the sensors???

Thank you, Provas

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-Rule your Destiny-
--Be Good. Be Bad. Be Provas--

Aristides Alvarez

Hello Provas,
·
I believe that the motor you're talking about is a Variable Reluctance Motor (from the stepping family). The goal on those motors is to run at constant speed so they're useful to rotate disks but hard to use as robotic motors.
·
They usually have a big mass to improve their inertia and reduce changes in rotation speed. To drive a robot around you usually need the opposite effect, to be able to start moving and stop under the command of the microcontroller.
·
I did use some of those units but recycling the motor, the motor controller and the sensors altogether. If you keep the motor, motor controller and the sensors (sometimes optical and sometimes Hall Effect) usually you'll find an enable pin to turn the motor on and off. If you don't find the enable pin you could just use the power supply to control it.
·
The only application I could find for such motor was a rotational LED display that you can see in the attached images. In that case having a motor that rotates at a specific angular speed helps reinforcing the optical effect of the text staying in place.
·
Regards,

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Aristides Alvarez
Education and Technical Support Manager
aalvarez@parallax.com
Parallax, Inc. www.parallax.com

Tricky Nekro

Thank you for your repplies Arximides.
Here are two pictures of my stepper motor...
It seems to have three pins for current supply from which two of them must alternate very quickly in order to spin. Now, the question is how??? If you don't alter them it starts to drain current like there is no tomorrow...

Thankfully, Provas
Greece

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-Rule your Destiny-
--Be Good. Be Bad. Be Provas--