Stepping Motor HELP !

kenwtn · 2008-08-13 20:29

Hi All,

·· I should start by saying I am new to stepping motors. I picked up these stepping motor and have attached the PDF for them. My question is there is 6 wires coming out of the motor, but only 4 are attached to the connector. It seems the 2 commons are not attach to anything and wrapped under the insulation. Can someone explain this to me please?

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_{When you spend 10 times what it cost to build it yourself - That's when it becomes a HOBBY !}

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Franklin · 2008-08-13 20:34

what wires do you have? the pdf you linked has six wires for the motor and four wires for an encoder.

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- Stephen

kenwtn · 2008-08-13 20:38

·· The encoder is seperate and I m not using it at this time. The wires are Black, Yellow, Green, Red, White and Blue. The Yellow and White are not connected just hidden under the Heat Shrink.

Ken

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_{When you spend 10 times what it cost to build it yourself - That's when it becomes a HOBBY !}

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kenwtn · 2008-08-13 21:41

My question then boils down to using the ULN2803. Do I only need the Black/Green adn Red/Blue connected to the ULN2803? Can I leave the YELLOW AND WHITE Not connected?

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_{When you spend 10 times what it cost to build it yourself - That's when it becomes a HOBBY !}

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CannibalRobotics · 2008-08-13 21:52

It's easer to use if you get to the yellow and white. Those are the common's for the 4 phase coils. You can drive each coil with a single transistor. If you try to use just the other four you will get into H bridges and reversing polarity on the coils. That's a big first step (no pun intended).
Jim-

kenwtn · 2008-08-13 21:54

I can get to the commons, do they just goto·Common on the ULN2803 and the Black, Green, Red and Blue goto 4 Out Lines?

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_{When you spend 10 times what it cost to build it yourself - That's when it becomes a HOBBY !}

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Post Edited (kenwtn) : 8/13/2008 10:16:01 PM GMT

CannibalRobotics · 2008-08-13 22:23

It looks like the ULN2803 grounds connection when provided a signal. SO, the way to handle it is attach the Yellow/White leads to your motor power supply (+) lead.
Then hook up each of the other lines to the 'outputs' on the ULN2803. When you provide a signal to the ULN2803 input pin, it will switch ON the associated phase coil by grounding it.
Beware - until you get this part all straigntened out, I'd suggest using a seperate power supply for the stepper and the stamp. Back EMF's on steppers can really mess with your life.

kenwtn · 2008-08-13 22:25

Sounds good... THANKS FOR YOUR HELP

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_{When you spend 10 times what it cost to build it yourself - That's when it becomes a HOBBY !}

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CannibalRobotics · 2008-08-13 22:30

Let us know how it works.
Cheers
Jim-

kenwtn · 2008-08-13 23:24

Hi Again,

·· I made the connections as suggested and I have attached the code I am using. Now all I get is the stepping motor gittering back and forth. Any IDEAS

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_{When you spend 10 times what it cost to build it yourself - That's when it becomes a HOBBY !}

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Franklin · 2008-08-14 00:37

Read up a bit on steppers so you can understand the sequence you need to make the motor rotate. If your are driving it correctly then you may have a problem with not having enough power to "set" the coils. I'm not a stepper wiz so this is just general thoughts.

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- Stephen

kenwtn · 2008-08-14 00:45

Thanks, I was thinking the samething so kind of on the right track.

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_{When you spend 10 times what it cost to build it yourself - That's when it becomes a HOBBY !}

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CannibalRobotics · 2008-09-10 21:30

How goes it?

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A wise man told me; "All electronics are made to work by magic smoke.

Don't ever let it out as it's·very difficult·to get it back in."

Stepping Motor HELP !

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