Microstepping, Accuracy, and Torque

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om_tech_support_JT
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Microstepping, Accuracy, and Torque

Postby om_tech_support_JT » Tue Aug 16, 2011 5:35 pm

Q: Does microstepping affect a step motor's positioning accuracy or torque output?

A: No. Microstepping with our step motor drivers will not decrease your motor's torque output. Torque is the product of the current and the number of coil turns, which is kept constant even when microstepping. Your motor will still have the same torque output at the same speeds; however, your resolution will increase. Microstepping does not increase your motor's positioning accuracy. Resolution and accuracy are different in definition and should not be confused with each other. Since accuracy is a function of tooth machining precision and winding resistance consistency (also stay constant when microstepping), so the positioning accuracy will remain the same at 2~3 arc minutes (depending on motor type). Our high resolution step motors can achieve better positioning accuracy and lower vibration since it reduces the displacement angle against load torque.

timoluca
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Joined: Sat Oct 24, 2015 11:33 am

Re: Microstepping, Accuracy, and Torque

Postby timoluca » Thu Oct 19, 2017 4:54 pm

How does your controller keep the torque up while microstepping? Does it increase the current to compensate?

om_tech_support_JS
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Joined: Tue May 10, 2016 4:48 pm

Re: Microstepping, Accuracy, and Torque

Postby om_tech_support_JS » Thu Oct 26, 2017 6:48 am

Hi timoluca,

In regards to your post, our driver will monitor the current on the windings. Based on the monitored current, the driver will then make an adjustment in order to optimize the torque. This function is the current correction (or compensation).

timoluca
Posts: 4
Joined: Sat Oct 24, 2015 11:33 am

Re: Microstepping, Accuracy, and Torque

Postby timoluca » Thu Oct 26, 2017 12:04 pm

Thanks for your response. So just to be clear - the first post in this discussion asked if microstepping reduces the torque, and the answer should have been "yes". However, the Oriental Motor driver is smart enough to adjust the current to keep the torque constant. Please let me know if you agree.

om_tech_support_JS
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Re: Microstepping, Accuracy, and Torque

Postby om_tech_support_JS » Thu Oct 26, 2017 2:41 pm

Hi timoluca,

In regards to your correction, the original response included the statement: "Microstepping with our step motor drivers will not decrease your motor's torque output." The key point is that our driver is smart enough to adjust the current to keep the torque constant. In a general stance, then a simpler driver could have close to 71% (1/sqrt2) less torque when microstepping.

timoluca
Posts: 4
Joined: Sat Oct 24, 2015 11:33 am

Re: Microstepping, Accuracy, and Torque

Postby timoluca » Thu Oct 26, 2017 3:04 pm

OK, yes, I agree. Thanks for your prompt response, much appreciated.


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