10-pole/9-slot synchronous motor

Patent metadata

Field	Value
Publication number	US-10601274-B2
Application number	US-201414787783-A
Country	US
Kind code	B2
Filing date	May 20, 2014
Priority date	Jun 3, 2013
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

A 10-pole/9-slot synchronous motor includes nine teeth that are divided into three phases, each having three adjacent teeth. A stator iron core is configured such that a value obtained by dividing b by a is larger than 0.5 where the a is a width of a teeth tip, which is provided on an inner diameter side of a tooth of the teeth formed on the stator iron core, from a base portion between the teeth tip and the tooth to a circumferential end of the teeth tip and the b is a thickness of the teeth tip from the base portion to an inner-diameter side surface of the teeth tip.

First claim

The invention claimed is:

1. A 10-pole/9-slot synchronous motor, the excitation force of which in a radial direction is reduced, comprising:
a rotor including ten permanent magnets that are positioned in a circumferential direction on an outer diameter surface thereof; and
a stator provided on an outer diameter surface side of the rotor via an air gap, wherein
the stator includes:
a circularly-formed stator iron core;
nine teeth that are provided on an inner periphery of the circularly-formed stator iron core and positioned at regular intervals in a circumferential direction of the circularly-formed stator iron core; and
nine tooth tips, which are provided on radially inner ends of the teeth, respectively, and have a structure extending from circumferential ends of the teeth, respectively, in a circumferential direction,

the circularly-formed stator iron core is configured such that, for each tooth and corresponding tooth tip, a value obtained by dividing b by a is larger than 0.5 where a is a width of the tooth tip, from a base portion of the tooth tip to a circumferential end of the tooth tip, and b is a thickness of the tooth tip from the base portion to a radially-inner surface of the tooth tip, and
the circularly-formed stator iron core is formed so that a value obtained by dividing D by P is within a range from 0.25 to 0.4, where D is a width of the tooth, around which a winding is wound, and P is a slot pitch between two adjacent slot openings, wherein the slot pitch P is measured at the radially-inner surface of the tooth tip, which faces the outer diameter surface of the rotor, and wherein P has a value obtained by adding:
a length in the circumferential direction from one circumferential end of the tooth tip of the tooth to a circumferential center of one slot opening of the two adjacent slot openings,
a length in the circumferential direction from the other circumferential end of the tooth tip to a circumferential center of the other slot opening of the two adjacent slot openings, and
a circumferential width of the radially-inner surface of the tooth tip.

2. The 10-pole/9-slot synchronous motor according to claim 1 , wherein a ferrite magnet is used for the permanent magnet of the rotor.

3. The 10-pole/9-slot synchronous motor according to claim 1 , wherein
a rare-earth magnet is used for the permanent magnet of the rotor, and
the circularly-formed stator iron core is formed so that a value obtained by dividing b by a is larger than 0.6.

4. The 10-pole/9-slot synchronous motor according to claim 1 , wherein the circularly-formed stator iron core is formed so that as a value of a increases, a value of b increases, and the value obtained by dividing b by a is larger than 0.5, to suppress an increase of magnetic flux density in a region from the base portion to the circumferential end.

5. A 10-pole/9-slot synchronous motor, the excitation force of which in a radial direction is reduced, comprising
a rotor including ten permanent magnets that are positioned in a circumferential direction on an outer diameter surface thereof; and
a stator provided on an outer diameter surface side of the rotor via an air gap, wherein the stator comprises:
a circularly-formed stator iron core;
nine teeth that are provided on an inner periphery of the circularly-formed stator iron core and positioned at regular intervals in a circumferential direction of the circularly-formed stator iron core; and
nine tooth tips that are provided on radially inner ends of the teeth, respectively, and that extend from circumferential ends of the teeth in a circumferential direction, respectively, wherein

a central position of the stator in the radial direction is A, and
for each tooth and corresponding tooth tip,
a line connecting a base portion between the tooth tip and the tooth and A is B,
an intersection between an inner-diameter side surface of the tooth tip and B is C,
a width from C to a circumferential end of the tooth tip is a, and
a thickness of the tooth tip from the base portion to C is b,
the circularly-formed stator iron core is configured such that a value of b increases with an increase of a value of a, and a value obtained by dividing b by a is in a range from 0.5 to 0.7 to suppress an increase of magnetic flux density in a region from the base portion to the circumferential end of the tooth tip, and
the circularly-formed stator iron core is formed so that, a value obtained by dividing D by P is within a range from 0.25 to 0.4 where the D is a width of the tooth, around which a winding is wound, and P is a slot pitch between two adjacent slot openings, wherein the slot pitch P is measured at the radially-inner surface of the tooth tip, which faces the outer diameter surface of the rotor, and wherein P has a value obtained by adding:

a length in the circumferential direction from one circumferential end of the tooth tip of the tooth to a circumferential center of one slot opening of the two adjacent slot openings,
a length in the circumferential direction from the other circumferential end of the tooth tip to a circumferential center of the other slot opening of the two adjacent slot openings, and
a circumferential width of the radially-inner surface of the tooth tip.

Assignees

• Mitsubishi Electric Corp

Inventors

• Matsuoka Atsushi
• Baba Kazuhiko
• Aso Hiroki
• Urabe Yuto

Classifications

• H02K3/28

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title

• H02K29/03

  with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems · CPC title

• H02K2213/03

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

• H02K3/18 Primary

  Windings for salient poles · CPC title

• H02K1/146

  consisting of a generally annular yoke with salient poles · CPC title