| 摘要 |
PURPOSE:To prevent vibration and to reduce loss, by burrying a drive coil into a rising wall formed in the housing and arranging a permanent magnet on the outer circumferential face of the inner yoke of a rotor. CONSTITUTION:A DC motor 20 comprises a housing 24 having a central protrusion 24c and driving coils 21a-21d burried in an erecting wall surrounding the protrusion 24c, a rotor 22 having an outside yoke 22b adjoining to the outer circumferential face 24e and an inside yoke 22a adjoining to an outer circumferential face 24f, a permanent magnet 23 and a magnetic sensor 26. The housing 24 is made of synthetic resin, where a pressure insertion hole 30 and a ring type erecting wall 24b are provided integrally in the center of a base plate 24a. Each of driving coils 21a-21d is wound in a ring shape. Since the outside yoke and the permanent magnet rotate integrally, overcurrent can be reduced and the torque can be increased. |
