Abstract A three-phase hybrid type stepping motor includes a stator having 12 salient poles 1 1 , 1 2 , 1 3 , . . . , 1 11 , 1 12 . The stator salient poles having the number a of stator teeth 3 and those having the number (a+1) of stator teeth are disposed alternately and a pitch τ s1 of the number a of stator teeth and a pitch τ s2 of the number (a+1) of stator teeth satisfy the relation of τ s1 ≧τ s2 . A pitch angle formed by central lines of the salient poles and the stator teeth disposed in the salient poles is an equal pitch of 30 degrees and the number Z R of rotor teeth being given by Z R =12n±2 or Z R =12n±4 (where the numbers a and n are integers equal to or larger than 1). The three-phase stepping motor has excellent characteristics in vibration, resolution and high-speed operation as compared with a two-phase stepping motor and its driving circuit can be made simple and low-cost in manufacturing.
Inventors
👤 Hirobumi Satomi
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-09 15:14
CPC Classifications
H; H02; H02K; H02K37/00; H02K37/02; H02K37/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
151 words
A three-phase hybrid type stepping motor including a stator having 12 salient poles disposed radially and a plurality of stator teeth disposed in a surface of each of said salient poles opposite to a rotor characterized in that: said salient poles of said stator having the number a of stator teeth and those having the number (a+1) of stator teeth are disposed alternately, and a tooth pitch τ s1 of the number a of stator teeth and a tooth pitch τ s2 of the number (a+1) of stator teeth satisfy the following relation: τ.sub.s1 ≧τ.sub.s2 a pitch angle formed by central lines of said salient poles and said stator teeth disposed in said salient poles being an equal pitch of 30 degrees, the number Z R of rotor teeth being given by Z.sub.R =12n±2 or Z.sub.R =12n±4 where the numbers a and n are integers equal to or larger than 1.
Claim 2
Dependent Claim
151 words
A three-phase hybrid type stepping motor including a stator having 12 salient poles disposed radially and a plurality of stator teeth disposed in a surface of each of said salient poles opposite to a rotor characterized in that: said salient poles of said stator having the number a of stator teeth and those having the number (a+1) of stator teeth are disposed alternately, and a tooth pitch τ s1 of the number a of stator teeth and a tooth pitch τ s2 of the number (a+1) of stator teeth satisfy the following relation: τ.sub.s1 ≧τ.sub.s2 a pitch angle formed by central lines of said salient poles and said stator teeth disposed in said salient poles being an equal pitch of 30 degrees, the number Z R of rotor teeth being given by Z.sub.R =12n±2 or Z.sub.R =12n±4 where the numbers a and n are integers equal to or larger than 1.
Claim 3
Dependent Claim
31 words
A three-phase hybrid type stepping motor according to claim 1, wherein said stator includes iron plates forming said stator iron core and being successively shifted by 60 degrees to be laminated.