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I would like to ask for some help regarding a stepper motor I would like to use. I need 1 deg step and as I have seen there is no such stepper. Could you advise me as an amateur the way i could bring this down from 1.8 or bring t up from 0.9 . What is easier and less complex?

Thank you,

John

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    \$\begingroup\$ IMO the best advice it to reconsider your 1 degree requirement. Where does it come from? \$\endgroup\$ – Wouter van Ooijen Jul 6 '14 at 10:03
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One way to increase the resolution so that you can make steps close to an exact one degree is to use a microstepping driver.

enter image description here

That kind of driver works by PWM-modulating the current to the motor coils in a ratio that allows the rotor to stabilize in a position between the poles. You can't really increase the resolution by a huge factor, despite the driver stepping in (say) 128 or 256 microsteps but it might be good enough for you.

If you had 8 microsteps on a 1.8 angular degree motor, then each step would represent 0.225 degrees, and every 40 microsteps (9°) you'd be back to an exact full step.

You can make your own, or there are commercial suppliers such as Gecko.

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One way to change the step size is with a gear box. If you had a 1.8 degree stepper motor and used a gear box with a input to output ratio of 1.8::1.0 you would achieve what you want. There are two price you pay for this. First off a gear box can introduce backlash which shows up in motion as a latency at change of direction. The second price is that the stepper motor has to run at a faster rpm that the output will achieve.

An advantage of the gear box is that it will give you a mechanical torque increase at the load over the direct drive approach comparing both cases with the same motor characteristics.

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  • \$\begingroup\$ He wants advice "as an amateur way" on how to do this. A custom gearbox does not really seem "easier and less complex". \$\endgroup\$ – WhatRoughBeast Jul 5 '14 at 23:27
  • \$\begingroup\$ Building your own wouldn't be all that difficult, for low torque applications. \$\endgroup\$ – whatsisname Jul 7 '14 at 15:09
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Thank you for your response and analytic information.

What I have found for anyone that will need something like I did, look at this :

http://www.omc-stepperonline.com/gear-ratio-91-spur-gearbox-high-torque-nema-34-stepper-motor-34hs384004dsg9-p-195.html

J.

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    \$\begingroup\$ To respond to other's posts, please post as comments (once you have sufficient reputation for this), or as edits to your question - This space is reserved for actual answers to the questions. \$\endgroup\$ – Anindo Ghosh Jul 7 '14 at 12:34
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    \$\begingroup\$ @AnindoGhosh: This is an answer to the question. \$\endgroup\$ – Dave Tweed Jul 7 '14 at 12:54
  • \$\begingroup\$ Sorry, I should have been clearer. My point relates to "Thank you for your response and analytic information." \$\endgroup\$ – Anindo Ghosh Jul 7 '14 at 12:57

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