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How to modify a unipolar stepper motor Howard 1-19-4200 to bipolar mode

Disassembled stepper motor

Unipolar and bipolar stepper motors differ only in the internal wiring of the magnetic coils. Here I show how to modify the internal connections of the very cheap NEMA17 stepper motor 1-19-4200 (SM4200) from Howard Industries to a bipolar configuration. These

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Posted in Theory, Tinkering
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