10 tooth Pullies? September 18, 2011 10:21PM |
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Re: 10 tooth Pullies? September 19, 2011 01:17AM |
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Re: 10 tooth Pullies? September 20, 2011 06:39AM |
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Re: 10 tooth Pullies? September 21, 2011 02:46AM |
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Re: 10 tooth Pullies? February 04, 2012 05:39AM |
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Quote
Why are all Geckodrive stepper products ten microsteps by default?
All stepper drives manufactured by Geckodrive have a default resolution of ten microsteps because of motor linearity. A step motor is a mechanical device that is manufactured to a certain tolerance. Typically a standard motor has a tolerance of +/- 5% non accumulative error regarding the location of any given step. This means that any step on a typical 200 step per revolution motor will be within a 0.18-degree error range. Stated otherwise, the motor can accurately resolve 2000 radial locations. Coincidentally this is the resolution of a 10 microstep drive.
Any microstep resolution beyond 10, such as 125, yields no additional accuracy, only empty resolution. By analogy, a voltmeter having a 6 digit display while having 1% accuracy would have meaningful information only in the first two digits. There are two exceptions justifying higher resolutions: The step motor is being run in a closed-loop application with a high-resolution encoder or the application requires smooth operation at very low speeds (below 5 full steps per second).
The secondary reason behind the ten microstep number is step pulse timing. If you have a motor control such as the G203V that requires 2kHz to move one full step in one second, you can get 1500RPM from a 50kHz signal. If you have the exact same signal speed at 256 microsteps your motor will drop off to 58RPM with the exact same accuracy of +/- 5% of one full step. The net result is a drop in speed with no clear improvement in accuracy on the mechanism.
Re: 10 tooth Pullies? October 12, 2013 12:04PM |
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