Patent ID: 6194806
Filing Date: 2001-02-27
Classification: H02K

Abstract:
An iron core cylindrical radial gap motor structure characterized by having field magnetic poles generated by permanent magnets and having, in opposition to these, salient poles to generate a rotational magnetic field arranged with their emission direction along the rotational axis, a shape of each of the salient poles being approximately T-shaped in cross-section along a rotational axis direction, and I-shaped in cross-section at right angles to the rotational axis direction, an upper end of said T-shape opposing the axial direction of the field magnetic poles and a lower end being mechanically coupled and fixed to a stator ring, thus constructing a magnetic circuit of an armature, and where the relationship between a length L1 of each of the salient poles in the axial direction opposed to the field magnetic poles, and a length L2 in the axial direction of a coil core section about which a coil is wrapped, satisfies the conditions 0.3*L1.ltoreq.L2.ltoreq.0.6*L1, and, furthermore, where the relationship between a thickness A1 of each of the salient poles in the circumferential direction, and a pitch P of each of the field magnetic poles, satisfies the conditions 0.4*P.ltoreq.A1.ltoreq.0.8*P.