초록 ▼

A two-phase permanent-magnet electric rotating machine in which vibration and noise are less is provided. The machine is constituted by: a stator having 2.sup.n main poles (n being an integer satisfying n.gtoreq.2) each of which has at its end portion a predetermined number of magnetic teeth and has

A two-phase permanent-magnet electric rotating machine in which vibration and noise are less is provided. The machine is constituted by: a stator having 2.sup.n main poles (n being an integer satisfying n.gtoreq.2) each of which has at its end portion a predetermined number of magnetic teeth and has a winding provided thereon; and a rotor having permanent magnets formed so that N (north) and S (south) equal in number of the permanent magnets are alternately disposed in a direction of rotation of the rotor; wherein 2.sup.(n-1) alternate ones of the main poles are made to be in-phase and a half ones of the in-phase main oles have a polarity which is opposite to a polarity of the other ones. It is preferable to make the number of the magnetic pole pairs of N and S of the rotor be 4m.+-.1 (m being an integer satisfying m.gtoreq.1) when the value n is set to 2. It is preferable to form the windings so that the in-phase main poles of the stator are made to be alternately inverted in polarity.

대표청구항 ▼

[ What is claimed is:] [1.] A two-phase permanent-magnet electric rotating machine comprising: a stator having 2.sup.n main poles (n being 2 or 3) provided circumferentially so as to project inward centripetally from an inner circumferential surface of a substantially annular magnetic body, said sta

[ What is claimed is:] [1.] A two-phase permanent-magnet electric rotating machine comprising: a stator having 2.sup.n main poles (n being 2 or 3) provided circumferentially so as to project inward centripetally from an inner circumferential surface of a substantially annular magnetic body, said stator having exciting windings wound on said main poles respectively, each of said main poles having on its end portion a predetermined number of magnetic teeth; and a cylindrical rotor having a plurality of permanent magnets formed in a manner so that N (north) and S (south) poles equal in number of said permanent magnets and equal to (n-1) (4m.+-.1) (m being an integer satisfying a condition m.gtoreq.2) are adjacent and continuously alternately circumferentially disposed on a back yoke formed from a magnetic substance, said permanent magnets having a circumferential polar direction between said N and S poles, said rotor being supported so as to be rotatable relative to said stator with a predetermined air gap between surfaces of said main poles and surfaces of said permanent magnets, wherein said magnetic teeth and said permanent magnets face each other circumferentially side by side in a plane perpendicular to the axial direction to generate magnetic flux only in the circumferential and radial directions; wherein said main poles are arranged in a manner so that 2.sup.(n-1) alternate ones of said main poles are made to be in-phase and that a half of said in-phase main poles have a polarity. which is opposite to a polarity of the other half of said in-phase main poles.