Steppers and control signals

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windoze killa
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17 Jun 2014 16:32 #48028 by windoze killa

Steppers and control signals was created by windoze killa

I have been looking on the net for information on steppers and how to control them. The steppers I have are 5 wire unipolar, 12V, 320ma/phase. I have seen a few different controllers that supply different types if signals. I have having trouble finding information of the differences. Hopefully one of your learned fellows can explain the difference between the following.

1000
0100
0010
0001

and

1010
0110
0101
1001

Any help much appreciated.

Jason

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BigJohnT
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17 Jun 2014 18:58 #48031 by BigJohnT

Replied by BigJohnT on topic Steppers and control signals

The LinuxCNC stepgen can do 15 different step types.

linuxcnc.org/docs/html/hal/rtcomps.html#sec:Stepgen

JT

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windoze killa
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18 Jun 2014 15:35 #48053 by windoze killa

Replied by windoze killa on topic Steppers and control signals

Thank you. Now I am even more confused. None of that explained the difference between the 2 I asked about.

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ArcEye
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18 Jun 2014 15:59 #48055 by ArcEye

Replied by ArcEye on topic Steppers and control signals

1000
0100
0010
0001

and

1010
0110
0101
1001

You haven't said what these are or where you got them

AFAIK, you can simply use 5 or 6 wire unipolar steppers as bipolar by just ignoring the wire(s) that go to the central tap on the coils.

Then they can be run from a standard bipolar driver with stepgen type 0

regards

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windoze killa
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18 Jun 2014 16:49 #48057 by windoze killa

Replied by windoze killa on topic Steppers and control signals

ArcEye wrote:

1000
0100
0010
0001

and

1010
0110
0101
1001

You haven't said what these are or where you got them

AFAIK, you can simply use 5 or 6 wire unipolar steppers as bipolar by just ignoring the wire(s) that go to the central tap on the coils.

Then they can be run from a standard bipolar driver with stepgen type 0

regards

I got these from various sites that have stepper drivers. I am trying to build my own drivers (I am an electronics technician) I was just hoping that some one could tell me the difference between the 2 stepping sequences and what the benefit of each would be.

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andypugh
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19 Jun 2014 06:20 #48095 by andypugh

Replied by andypugh on topic Steppers and control signals

windoze wrote:
1000
0100
0010
0001

and

1010
0110
0101
1001

The first variant energises one coil at a time. The second energises two. The second should have better torque as there is no risk of zero excitation at any point in the sequence.
But... I don't think the second one is right. I think it should be

1010
0110
0101
0011
1010
1001
0101
1100

Which is a half-stepping 2-coil sequence.

if you are building your own driver then just let LinuxCNC do the heavy lifting. It can output arbitrary patterns (in table mode) so you can experiment for free. Don't put your assumptions in hardware :-)

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