Low-Cost Stepper Motor Indexing Circuit for 30° Rotation per Input Signal

Dear friends,
i have typical application need your help

my requirement
i have to use stepper motor in an application in which the stepper motor has to rotate to angle of 30 degree and should stop. again when signal is provided or supplied it has to rotate 30 degree and stop. it has to be repeated whenever the signal is given, its just a indexing job, how this can be done can any one explain with circuit diagram?

( simple components to be used in order to keep the project budget low)

thanks in advance

Really need far more information, but it can be controlled with a simple micro or FPGA

Dear Mr.Brown,
Basically i am from mechanical engineering, n not familiar with electrical components.
so please explain me in detail and also please let me know further what kind of information you need?
seeking ur reply...

Check this out for very comprehensive coverage of stepper motors:

* library.solarbotics.net/pdflib/pdf/motorbas.pdf

And these references:

* http://home.cogeco.ca/~rpaisley4/Stepper.html
* http://homepage.cs.uiowa.edu/~jones/step/
* http://library.solarbotics.net/pieces/parts_mech_steppers.html
* users.ece.utexas.edu/~valvano/Datasheets/Stepper_ST.pdf

The easiest way is to use an internal indexer stepper motor driver and a microcontroller. You may need help with the microcontroller side.

How would I do it? I would use either a DRV8811, DRV8818, DRV8824 or DRV8825 and drive it with a microcontroller to send pulses into its STEP input so that it moves the exact number of steps. How many steps is that?

Well you want the motor to move 30 degrees. So say your motor is a 200 steps per revolution, that means each step is 1.8 degrees (360 / 200). To move to position 30 degrees, you would need to send 16.666 full steps. But how can you do 0.666 steps? Well, all of these devices do something called microstepping. I would set the device to do 8 degrees of microstepping (MODE 1 and MODE 0 are both HI) which means the motor now has 1600 steps per revolution, instead of 200. This also means each pulse transition at the STEP input is now 0.225 degrees instead of 1.8 degrees. Finally, this means if you send 133 microsteps, you will move to position 29.925 degrees which hopefully is good enough.

To move back to 0 degrees, simply toggle the DIR input and send the exact same number of steps.

I have been making stepper motor designs for the past 12 years. The most recent of them can be purchased from www.driverdudes.com. If you look at a driver board such as the AE-STPR8818 or the AE-MegaMotor II, they all are pretty much ready to go and all you need to do is add the counting feature.

If you need a prepackaged solution, you can purchase a DRV8818EVM or a DRV8825EVM from the TI eStore and the Windows Software will let you do everything which I have described here.

The real question, though, is what is the voltage and the current that you want to run this? Because that will define whether any of these drivers will work or not.

thanks for all the information guys

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