FIELD: instruments of fine mechanics. SUBSTANCE: magnetic core with pole pieces is installed between covers 11 and 12. Magnets 51 and 52 with pole pieces magnetized in opposition adjoin butts of magnetic core. Coils 71 and 72. connected in aiding are positioned in rectangular windows of magnetic core, pole pieces and magnets. Slots and cuts-out are made in pole pieces of magnets 51 and 52. for registration of rotor. EFFECT: enhanced stepping reliability. 10 dwg
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