| 摘要 |
A dual phase stepper motor is described, particularly for driving an indicator needle, of the type comprising a stator part formed by a main block (1) of a soft magnetic material connected to four magnetic cores (3-6) each supporting an electrical coil (14-17), and a cylindrical thin-walled rotor with 2N+1 pairs of magnetic poles radially magnetised, wherein the tip of the magnetic cores (3-6) is separated from the rotor only by a radial gap and two diametrically opposed cores are magnetised in opposite directions by coils (14-17) of the same phase. The magnetic flux is closed by a secondary block (30) on the opposite side from the magnetic cores (3-6) relative to the thin permanent magnet, and the number of magnetic pole pairs of the magnet is 2N+1, where N is 1 or 2.
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