The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 27, 2001
Filed:
Jun. 09, 1999
Yuzuru Suzuki, Shizuoka-ken, JP;
Sakae Fujitani, Shizuoka-ken, JP;
Yoshiyuki Aono, Shizuoka-ken, JP;
Masaki Kagawa, Shizuoka-ken, JP;
Minebea Co., Limited, Nagano-ken, JP;
Abstract
An iron core type cylindrical radial gap type motor structure, by having field magnetic poles generated by permanent magnets and, in opposition to these, salient poles generating a rotational magnetic field and arranged with their emission direction along the rotational axis, the shape of salient poles being approximately T-shaped in cross-section along the rotational axis direction, and I-shaped in cross-section at right angles to the rotational axis direction, the upper end of said T-shaped opposing the axial direction of the rotor magnets and the lower end being mechanically coupled and fixed to the stator ring, thus constructing the magnetic circuit of the armature, and where the relationship between the length L,of the said salient pole in the axial direction opposed to the field magnetic pole, and the length L,in the axial direction of the coil core section about which the coil is wrapped, satisfies the conditions 0.3*L,≦L,≦0.6*L,, and, furthermore, where the relationship between the thickness A,of the said salient pole in the circumferential direction, and the pitch P of the field magnetic pole, satisfies the conditions 0.4*P≦A,≦0.8*P.