| 摘要 |
PURPOSE:To increase revolving torque by providing an auxiliary permanent magnet at a place opposite to the magnetic pole section of a permanent magnet. CONSTITUTION:A cuppy type coreless motor 1 has a stator using a permanent magnet 2 as a field system and an armature as a rotor with a cylindrical coreless coil 3. The stator has cylindrical internal and external yokes 4-5 concentrically disposed on the inside and outside of the permanent magnet 2 having a columnar external shape, and an air gap G is formed to the stator. The armature has the coreless coil 3, a shaft 6 and a commutator 7, and is arranged concentrically to the air gap G. Recessed sections are shaped respectively along the axial direction where opposite to the N pole and S pole of the permanent magnet 2 in the external yoke 5 at that time, and auxiliary permanent magnets 2a, 2a' are disposed into the recessed sections. Accordingly, the section of magnetic flux density by the auxiliary permanent magnets 2a, 2a' is further increased in magnetic flux density shaped in the air gap G, thus elevating revolving torque.
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