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 Follow the build log for my stepper motor dyno!

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Jeff_Birt



Number of posts : 864
Registration date : 2009-01-18
Age : 49
Location : Rolla, Missouri USA

PostSubject: Follow the build log for my stepper motor dyno!   Sun Oct 21, 2012 9:43 pm

I've been trying to stress the importance of choosing the right stepper motor for the job for years now. This runs contrary to the 'bigger-is-better' idea that is so popular among hobbyist. I often point folks toward stepper motor torque curves but as these are all done by different manufacturers, with different stepper drives, etc it makes it hard to try and compare two different motors. (And sometimes I'm not sure how accurate some of these torque curves are.)

In an effort to have more reliable data to work with I decided to build my own stepper motor dyno for testing. I just posted the first blog entry today that covers the build: http://www.soigeneris.com/Blog/Default.aspx Follow along with the process and let me know what you think.

_________________
Happy Machining!

Jeff Birt - Soigeneris.com
Proud Dealer of Taig, Precisebits, Gecko 540,
SmoothStepper
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yi

avatar

Number of posts : 89
Registration date : 2011-07-31
Location : Toronto, Ontario, Canada

PostSubject: Re: Follow the build log for my stepper motor dyno!   Mon Oct 22, 2012 10:32 am

Super interest Jeff. I was thinking about doing the same thing here. Even for a spec as simple as holding torque, there seems to be many a different interpretation between vendors. My idea was to use a long moment arm with varying weights to measure this. However, this will not do anything to obtain the torque/RPM curve.

How does the load power resistors correspond to torque from the stepper? Is there any process to calibrate this?
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Jeff_Birt



Number of posts : 864
Registration date : 2009-01-18
Age : 49
Location : Rolla, Missouri USA

PostSubject: Re: Follow the build log for my stepper motor dyno!   Mon Oct 22, 2012 12:35 pm

yi,

I'll be covering the math behind the process in the next week or so. For measuring the holding torque you have the right idea. I have access to a digital torque wrench so I thought I would use that. The thing with holding torque is that it really does not tell you much about how the operate whilst rotating. There are some NEMA 23 motors with fantastic holding torque ratings that can't produce any more torque while turning than a much 'smaller' motor. You have to be cautious when referencing the rated holding torque because of this.

I posted a second installment this morning that covers modifying the motor to accept an encoder. The next post will cover mounting and testing the encoder.

_________________
Happy Machining!

Jeff Birt - Soigeneris.com
Proud Dealer of Taig, Precisebits, Gecko 540,
SmoothStepper
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