distance sensor for bipolar stepper controller

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vernichtung
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distance sensor for bipolar stepper controller

Postby vernichtung » Fri May 11, 2012 4:29 pm

Hi
My stepper motor is powering a roller chain assembly, which moves an object back and forth, over one axis. The time and number of steps it takes to reach either end varies each time, as the whole machine is very unreliably designed.
I'd like to place a sensor on the moving object, and use the position output (distance from either end) so that the motor would know when to change direction. The range of movement is about 35cm, so I could instead need a proximity/force sensor on each end.
From what I understand, there is nothing within the Phidgets range that would do this while being compatible with the digital input on the stepper controller, ie all the distance sensors are analog..

I'd appreciate any suggestions.
Thanks

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burley
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Re: distance sensor for bipolar stepper controller

Postby burley » Mon May 14, 2012 7:58 am

Well, for a metallic object you could use the inductive proximity sensor.

http://www.phidgets.com/products.php?ca ... _id=3527_0

Alternatively there are the capacitive proximity sensors for non-metallic objects.

http://www.phidgets.com/products.php?ca ... _id=3524_0

Both are good to 15mm, so you could position them at either end of the track and when the object reached the end of the track you would be notified.
Brian Burley
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Patrick
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Re: distance sensor for bipolar stepper controller

Postby Patrick » Mon May 14, 2012 2:04 pm

You could also maybe use the magnetic switch: http://www.phidgets.com/products.php?ca ... _id=3560_0

-Patrick

vernichtung
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Re: distance sensor for bipolar stepper controller

Postby vernichtung » Tue May 15, 2012 11:16 am

Hi
Thanks for your replies - I shouldn't have missed the products suggested.

Patrick - Is the BR-1014's magnet strong enough to interfere with a large stepper motor, if operating at a distance of about one centimeter?

Brian - Would you know how wide the angle of detection is on the 3527? I'm asking because the metallic casing would have to be closer than the specified range, but not in front of the sensor.
Last edited by vernichtung on Tue May 15, 2012 7:47 pm, edited 1 time in total.

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burley
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Re: distance sensor for bipolar stepper controller

Postby burley » Tue May 15, 2012 2:18 pm

The sensing region for the proximity sensors is very narrow. It does not extend past the edges of the device what-so-ever.
Brian Burley
403-282-7335 ext. 6003
support@phidgets.com

vernichtung
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Re: distance sensor for bipolar stepper controller

Postby vernichtung » Fri May 18, 2012 5:18 am

Gents, thanks for your helpful answers.
I've decided to go with http://www.phidgets.com/products.php?product_id=3562_0 due to dimensional considerations and 5V terminal compatibility.


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