I have a Unipolar stepper motor with attached an additional coil as show in following two images. It takes high mechanical force, while moving motor's shaft with hand. And after removing this additional part by removing four screws, then it takes just a little mechanical force to move the shaft with hand.
Please guide me what is this attached additionally, how to use it and what is its benefit?
Please guide me what is this attached additionally, how to use it and what is its benefit?
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