It looks to me, after looking at your image, that this conversion will shorten the motor life. For bigger systems where this needs some pretty big preloads I doubt it is good for the lifetime of yours gears though. All this shows is that the cheap geared steppers available on ebay are in fact 6-wire steppers… revealed once the blue cap is lifted, i. Can I use this driver without damaging the stepper motor? Sign up using Email and Password. The drawback is that only half of the phase is carrying current at any given time, which decreases the torque you can get out of the stepper motor. Stepper leads A , C , B , and D should be connected to the stepper motor driver as normal for a bipolar stepper motor see the bipolar stepper connections above.

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What about a stepper with a gear head attached? This cause an increment in the temperature for the steady state, in the running of the motor.

Changing Unipolar Steppers To Bipolar | Hackaday

When was the last time you saw a stepper with feedback? They generally all have at least a zero point reference if not constant feedback. I am also in process of doing same thing. Very little inductance at that point, so keep it in mind as you tinker and it might help explain what mohor see.

Drivlng opinions expressed in this post are my own and are not necessarily those of CNCzone and its management. My 2c worth as a pedant engineer. In some cases you can add a preload with a spring to keep it from chattering around as much, this does mean your spring will eat up a part of your torque and you limit your travel.


By using a higher voltage along with active current limiting, the current is able to ramp up faster, which lets you achieve higher step rates than you could using the rated voltage. I thought I read this some where on the forum before but I can’t find it now.

Pololu – Stepper Motor: Unipolar/Bipolar, Steps/Rev, 42×48mm, 4V, A/Phase

The question of torque has also been amusing to read through. You are commenting using your WordPress. Using a Unipolar Stepper Driver to control a Bipolar motor. Though a bipolar stepper motor is more complicated to drive, the abundance of driver moyor means this is much less difficult to achieve.

These leads are center taps to the two coils and are not used for bipolar operation. Drivong running unipolar motors on a bi-polar drive.

Stepper Motor: Unipolar/Bipolar, 200 Steps/Rev, 42×48mm, 4V, 1.2 A/Phase

The A has the circuitry necessary to control a drivinf stepper motor. Home Questions Tags Users Unanswered. Should have bought the right motors I suppose. The A stepper motor drivers let you limit the maximum current, so as long as you set the limit below the rated current, you will be within spec for your motor, even if the voltage exceeds the rated voltage.


The common method wit running a unipolar motor bipolar is to run them in a half coil configuration. In short to get bipolar you just ignore the centre-taps.

The time now is Is motor heating something I should worry about? This NEMA size hybrid stepping motor can be used unipolwr a unipolar or bipolar stepper motor and has a 1. You need to remove this connection to use it as bipolar. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

I have a stepper with 6 wires Unipolarand I want to run it using my Xylotex Bipolar Driver, How do I figure out which wire go where??

Email Required, but never shown. Is position info is vital you use feedback.

There you would get H bridges need time delay, and lock out control circuitry to keep disallowed states from occurring. The extra turns you will get will increase the inductance and slow the increase in coil current.

That is the advantage to unipolar motors in fact.