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At an exam, I was asked the following question: A stepper motor has the greatest torque on its shaft in the 'halfstep/full step'. Everywhere on the internet it says that full step gives the most torque. This was also the answer I indicated. I have already emailed this to my professor but he claims that: at half step 2 coils are energised, which gives a field that is the vectorial sum of the two separate fields. Therefore, this field is stronger than the field of 1 coil. Is this correct? Does anyone know how I can prove him wrong? Thanks in advance

https://www.rs-online.com/designspark/stepper-motors-and-drives-what-is-full-step-half-step-and-microstepping?fbclid=IwAR2MUsN_a6kuycMIjG03aCDG-VUX2Qo8_Cu-m22Z55MJ5eOaRMV_lrpyoKk

https://www.designnews.com/automation-motion-control/how-use-microstepping-get-more-torque?fbclid=IwAR2yoRQWDvsBXDLKji-x-ujFMGTtVjQgTkUnDN4tCGuV9Z01cQqWABnOjp0

Gaboskar
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  • Where on the internet does it say what you say it says? Links please. – Andy aka Dec 24 '21 at 16:38
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    It depends how half stepping is implemented so it may or may not be true. In any case field strength is not the only factor determining torque. –  Dec 24 '21 at 18:33
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    duplicate of https://electronics.stackexchange.com/q/316462/1743 ? – Ben Voigt Dec 24 '21 at 19:21
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    If you are specifically interested in holding torque when the motor is still, then sure, you could energize A=100% B=100%, which would in principle be more than the holding torque at a full step position when only one coil was A=100% B=0%. But modern drivers combine them as vectors, in which case the answer would be no. – Pete W Dec 25 '21 at 01:58

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Stepper motor only ..., this note figure 9

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With stepper driver ... From this note , see "selecting driver mode", end of paper.

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Seems to be a little error (or comparison) in legend ... for figure 12.

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for half-stepping ... (comparing figure 10 and 12) ...

<<< Compared to full stepping (refer to figure 10 for the same driving conditions), a slightly-higher torque at low speed and a small decrease at higher step rates.>>>

Not really very significant with this driver.

Antonio51
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