# Torque half step/full step in stepper motor

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

• Where on the internet does it say what you say it says? Links please. Dec 24, 2021 at 16:38
• 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, 2021 at 18:33
• duplicate of electronics.stackexchange.com/q/316462/1743 ? Dec 24, 2021 at 19:21
• 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. Dec 25, 2021 at 1:58