| 摘要 |
<p>A three-phase hybrid type stepping motor of the present invention comprises a stator (5), a rotor (9) arranged concentrically with the stator (5) and with an air gap therebetween, six stator poles extending radially and formed at a regular pitch on the inner peripheral surface of an annular stator yoke (1), each of the stator poles having a plurality of small stator teeth (4) at the tip end thereof, the rotor (9) having two splitted rotor elements (7) and a permanent magnet (8) held therebetween and magnetized so as to form N and S poles in the axial direction thereof, fifty of small rotor teeth (6) formed at a regular pitch on the outer peripheral surface of each of the rotor elements (7), the two splitted rotor elements (7) being shifted from each other in angular position by a 1/2 pitch of the small rotor teeth (6), wherein a permeance distribution of the small stator teeth (4) is a vernier pitch balanced by a six or three order harmonic wave, and a tooth width ratio of the small rotor teeth (6) with the small stator teeth (4) is set to 0.35 - 0.45.</p> |
