Motor with stiffened stator core, manufacturing method thereof, and washing machine including the motor

Patent metadata

Field	Value
Publication number	US-10673289-B2
Application number	US-201415024184-A
Country	US
Kind code	B2
Filing date	Nov 7, 2014
Priority date	Nov 8, 2013
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

Provided is a high-powered low profile motor. The motor includes a stator (20) facing a rotor (50) while having a gap from the rotor (50). The stator (20) includes a ring-shaped connection core (10) formed by connecting a plurality of divided cores (5a) and an insulator (24) formed as if surrounding the connection core (10) by resin molding by an insertion forming. An inner diameter (r) of the connection core (10) is set smaller than inner diameters (R) of the divided cores (5a) bent in a half moon shape when connected.

First claim

The invention claimed is:

1. A washing machine comprising a motor, wherein the motor comprises:
a rotor that rotates around a rotation axis; and
a stator facing the rotor while having a gap from the rotor,
wherein the stator comprises:
a ring-shaped connection core formed by connecting a plurality of divided cores;
a reinforcement ring integrally formed with an outer circumferential portion of the connection core;
a penetration hole configured to receive a slide pin and formed in a radial direction through the reinforcement ring at least at a coupling portion or a neighboring portion thereof of the divided cores; and
an insulator formed by resin molding by an insertion forming and surrounding the connection core,

wherein a radius of curvature of a divided core of the plurality of divided cores in the connection core in an assembled state is smaller than a radius of curvature of the divided core of the plurality of the divided cores that is bent from a substantially straight line shape into a half moon shape in an unassembled state of the connection core, so that a spring-back force is present within each of the plurality of divided cores in the connection core in the assembled state, and
wherein the divided core in the substantially straight line shape includes a connection gap between adjacent cores that widens in a direction towards an interior surface of the divided core and that closes as the divided core is bent into the half moon shape.

2. The washing machine according to claim 1 , wherein:
a plurality of connection cores are stacked at the stator;
coupling portions of each of the layers of the divided cores are disposed in equal intervals along the circumferential direction when viewed from an axial direction; and
a number of magnetic poles of the rotor does not become a multiple of a total number of coupling portions of the divided cores.

3. The washing machine according to claim 1 , wherein:
a plurality of connection cores are stacked at the stator; and
when an axial thickness of the rotor is Lm, an axial thickness of the connection cores as a whole is Ls, axial thicknesses of both outer connection cores among the connection cores are Lc, and an axial thickness of the inner connection core is Lca, Lc<Lca is satisfied when Ls<Lm, and Lc>Lca is satisfied when Ls>Lm.

4. A motor comprising:
a rotor that rotates around a rotation axis; and
a stator facing the rotor while having a gap from the rotor,
wherein the stator comprises:
a ring-shaped connection core formed by connecting a plurality of divided cores;
a reinforcement ring integrally formed with an outer circumferential portion of the connection core;
a penetration hole configured to receive a slide pin and formed in a radial direction through the reinforcement ring at least at a coupling portion or a neighboring portion thereof of the divided cores; and
an insulator formed by resin molding by an insertion forming and surrounding the connection core,

wherein a radius of curvature of a divided core of the plurality of divided cores in the connection core in an assembled state is smaller than a radius of curvature of the divided core of the plurality of the divided cores that is bent from a substantially straight line shape into a half moon shape in an unassembled state of the connection core, so that a spring-back force is present within each of the plurality of divided cores in the connection core in the assembled state, and
wherein the divided core in the substantially straight line shape includes a connection gap between adjacent cores that widens in a direction towards an interior surface of the divided core and that closes as the divided core is bent into the half moon shape.

5. The motor according to claim 4 , wherein:
a plurality of connection cores are stacked at the stator;
coupling portions of each of the layers of the divided cores are disposed in equal intervals along the circumferential direction when viewed from an axial direction; and
a number of magnetic poles of the rotor does not become a multiple of a total number of coupling portions of the divided cores.

6. The motor according to claim 4 , wherein:
a plurality of connection cores are stacked at the stator; and
when an axial thickness of the rotor is Lm, an axial thickness of the connection cores as a whole is Ls, axial thicknesses of both outer connection cores among the connection cores are Lc, and an axial thickness of the inner connection core is Lca, Lc<Lca is satisfied when Ls<Lm, and Lc>Lca is satisfied when Ls>Lm.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Nakagawa Yukinori
• Yoshida Minoru
• Sonoda Yasuyuki
• Nagasaki Yasmasa

Classifications

• H02K1/16 Primary

  Stator cores with slots for windings · CPC title

• H02K15/095

  by laying conductors around salient poles · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02K1/185

  to outer stators · CPC title

• D06F37/206

  Mounting of motor · CPC title