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Join Date: Aug 2017
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# Stepper Motor

08/18/2017 12:24 PM

I am need a suggestion for specifications for stepper motor.That I want the stepper motor for turn 60 degree and some process is done then to another 60 degree and so on.I want to repeat this for 6 times and totally 360 degree and also you can program in keil..

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Guru

Join Date: Apr 2010
Posts: 6202
#1

### Re: Stepper motor

08/18/2017 12:46 PM

The stepper motor specification important to you are steps per revolution and torque. Make sure the torque is sufficient for your application. Steps per revolution need to be divisible by 6 for your application. Stepper motors are driven by special circuits, stepper motor drivers. The circuit is pulsed once per step. The second input to this circuit is the direction.

Here is a practical tutorial.

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Join Date: Dec 2008
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#2

### Re: Stepper Motor

08/18/2017 1:37 PM

One of the unspecified concerns you need to address is how precisely must these movements be 60°? Most two phase motors are 200 full steps per revolution (1.8°/ step). Half stepping will give you an accurate 0.9°/step, but using a drive with finer micro-stepping intervals will not be accurate (in other words, micro-stepping by 128 sub-intervals will have 128 sub-steps, but they will not be all the same fraction of a whole step.) You can get five phase stepping motors with 500 full steps per revolution.

Then there are the added concerns of how quickly you wish to move, how much inertia will the motor see, and load changes.

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Guru

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#8

### Re: Stepper Motor

08/18/2017 7:34 PM

If I had a 200 step motor, I would gear it down 1.5:1 giving 300 steps on the output shaft per revolution (50 for 60 degrees).

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#18

### Re: Stepper Motor

09/17/2017 11:24 AM

How about adding some gear wheels to change the range? Or even worm drive? Lots of power with a smaller motor?

Or maybe if a chain/belt drive is going to be used anyway, the drive wheel to the belt/chain might be specially selected?

Just a few thoughts....

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Guru

Join Date: Mar 2011
Location: Lubbock, Texas
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#3

### Re: Stepper Motor

08/18/2017 1:48 PM

You really need to provide the forum with additional information if we are to be successful to any degree in assisting you with your request.

Are you allowing to use gearing?

How much torque is required for the movement?

Could you do the same with a clockwork, a non-stepper DC motor, and a micro-controller that shuts off the motor at each 60 degree detente step?

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Power-User

Join Date: Oct 2008
Location: Troy, NY
Posts: 121
#4

### Re: Stepper Motor

08/18/2017 4:08 PM

You can also check out the GlobalSpec Specification Guide on stepper motors:

http://www.globalspec.com/learnmore/motion_controls/motors/stepper_motors

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#5

### Re: Stepper Motor

08/18/2017 4:18 PM

It depends on the application but you might consider a linear actuator setup...

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#6

### Re: Stepper Motor

08/18/2017 4:46 PM

If it needs to be really fast in progressing to next stepped position - use a solenoid of significant length, and make it ratchet the thing to each position.

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Guru

Join Date: Aug 2007
Posts: 19841
#7

### Re: Stepper Motor

08/18/2017 6:21 PM

Get a hybrid stepper, that's basically an integrated closed loop system.

it has an encoder, so that you don't lose a step.

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phoenix911
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#9

### Re: Stepper Motor

08/19/2017 7:33 AM

That's not what most people call a hybrid stepping motor. There is no requirement for an encoder.

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Guru

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Posts: 19841
#11

### Re: Stepper Motor

08/19/2017 2:46 PM

Thanks for more details .. I would like add a correction to my post.

Get a hybrid stepper, that's basically has an integrated closed loop system.

this is what I used when I retrofitting my manual milling machine to CNC.

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phoenix911
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#15

### Re: Stepper Motor

09/08/2017 8:18 AM

Hybrid stepper likely to have servo integrated.

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Prof. (Dr.) Shyam, Managing Director for Sensors Technology Private Limited. Gwalior, MP474001, India.
Guru

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Posts: 19841
#16

### Re: Stepper Motor

09/08/2017 8:24 AM

from my link on post #11, what is integrated is the encoder, closing the loop.

I have yet to test this for Computerized Numeric Control (CNC), I'm and curious as to when the correction occurs, after each block of code read, or actually cut. This I'm sure is how the control software you have is set.

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phoenix911
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#17

### Re: Stepper Motor

09/09/2017 4:55 AM

Yes, encoder is a must for a closed loop accurate position control as Stepper motors can slip a step and it often happens when speed is increased.

Sherline CNC use stepper motors.

http://sherline.com/

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Prof. (Dr.) Shyam, Managing Director for Sensors Technology Private Limited. Gwalior, MP474001, India.
Guru

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Posts: 1815
#10

### Re: Stepper Motor

08/19/2017 11:54 AM

Open the below link and read, I am sure, you will find it very useful and you have variety of subjects here.

https://www.electricaltechnology.org/2016/12/stepper-motor-construction-types-and-modes-of-operation.html?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+electricaltechnology1+%28Electrical+Technology%29

Dhayananhdhan.S

2
Associate

Join Date: Mar 2012
Posts: 25
#12

### Re: Stepper Motor

08/30/2017 3:08 PM

Not knowing the application or any specifications doesn't stop me from chiming in . . .

Could your needs be met by a regular motor driving a Geneva drive?

https://en.wikipedia.org/wiki/Geneva_drive

Guru

Join Date: Mar 2011
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#13

### Re: Stepper Motor

08/30/2017 3:21 PM

Very nicely done, sir! I think that should really take care of what the OP wanted, don't you? At least as long as it were a six-segmented Geneva. Did someone already mention that?

After further review, Carl gets the golden tennis shoes on this one!!!

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Associate

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Posts: 25
#14

### Re: Stepper Motor

08/30/2017 10:39 PM

I rescued a prototype Geneva drive from the recycle bin in the ESI model shop in the early '80s. It lives in my Mr. Science box and I show it to kids of all ages just to see the expressions on their faces when they "get it.". It is such a marvelous motion, locked in place for a while, then smoothly accelerated and decelerated, and then locked into place again. This model was to demonstrate what became the parts handler for the ESI Laser Trimmer systems. Old technology, but very neat!

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