| 摘要 |
<p>A 4-pole armature (12) is accommodated within a 4-pole permanent-magnet ring 10, either the ring or armature serving as the rotor. The core (16) of the armature is cross-shaped, and two opposite members of the core have windings (18) applied to them with opposite winding directions. The cross-shaped core (16) is provided on at least one, and possibly both, opposite pair of core ends with back-up core elements (20) extending in the rotational direction of the armature or in the direction opposite to the rotational direction of the ring. A commutator (22, 24, 26) or the like device for converting armature polarity is provided which alternates the direction of electric current for the armature every 90° rotation of the rotor.</p> |
