Electric motor and compressor

Patent metadata

Field	Value
Publication number	US-12506377-B2
Application number	US-202218281065-A
Country	US
Kind code	B2
Filing date	Mar 22, 2022
Priority date	Mar 22, 2021
Publication date	Dec 23, 2025
Grant date	Dec 23, 2025

Abstract

A three-phase electric motor includes a stator iron core, an insulator, and a plurality of coils. The coils are wound around teeth of the stator iron core and a winding body of the insulator. Among the plurality of coils, coils in the same phase are connected by series connection and are formed by one lead wire including connecting wires. A plurality of slits for allowing the connecting wires to pass are formed in the insulator. A deepest slit having the largest depth among the plurality of slits is provided such that at least a part of the deepest slit is located further on an outer side in a circumferential direction than an extension region obtained by virtually extending a corresponding deep groove-winding body, around which a corresponding deep groove-coil from which the connecting wires passing through the deepest slit are drawn is wound, to an outer diameter side.

First claim

The invention claimed is:

1 . A three-phase electric motor comprising:
a cylindrical stator iron core; a cylindrical insulator that is in contact with an end portion in an axial direction of the stator iron core; and a plurality of coils, wherein the stator iron core includes a plurality of teeth, and a number of teeth is a multiple of three, the insulator includes a plurality of winding bodies, the winding bodies face the teeth in the axial direction, the coils are wound around the teeth and the winding bodies facing each other, among the plurality of coils, coils in a same phase are connected by series connection and are formed by one lead wire including connecting wires, and a plurality of slits for allowing the connecting wires to pass through are formed in an outer circumferential wall portion of the insulator, when a slit, which has deepest depth among the plurality of slits, is represented as a deepest slit, a coil, from which the connecting wires passing through the deepest slit are drawn, is represented as a corresponding deep groove-coil, and the winding body, around which the corresponding deep groove-coil is wound, is represented as a corresponding deep groove-winding body, the deepest slit includes an edge portion to hold the connecting wires drawn out from a winding end of the corresponding deep groove-coil and the edge portion is located further on an outer side in a circumferential direction of the outer circumferential wall portion than an extension region obtained by virtually extending the corresponding deep groove-winding body to an outer diameter side of the outer circumferential wall portion, and the edge portion of the deepest slit is provided closer to the corresponding deep groove-winding body than an end portion of the corresponding deep groove-coil in a direction away from the corresponding deep groove-winding body in the circumferential direction.

2 . The electric motor according to claim 1 , wherein the edge portion of the deepest slit is provided away from the corresponding deep groove-winding body in the circumferential direction.

3 . The electric motor according to claim 1 , wherein the edge portion is provided on an outer side of a projection region where the corresponding deep groove-coil, from which the connecting wires are drawn, is virtually projected on the outer diameter side.

4 . The electric motor according to claim 1 , wherein
the plurality of coils includes nine coils, and when the nine coils are represented as a first coil to a ninth coil in arrangement order in the circumferential direction, a lead wire, which forms the first coil, the fourth coil, and the seventh coil, includes a first connecting wire that connects the first coil and the fourth coil, and a second connecting wire that connects the fourth coil and the seventh coil.

5 . The electric motor according to claim 1 , wherein, in the insulator,
a slit for series connection through which the connecting wires pass in the series connection, a slit for parallel connection through which the connecting wires pass in parallel connection, and a combined use slit through which the connecting wires pass in the series connection and the parallel connection, are formed.

6 . A compressor comprising:
the electric motor according to claim 1 ; and a compressing unit that is driven by the electric motor.

7 . The electric motor according to claim 1 , wherein a bottom of the deepest slit is provided closer to the stator iron core than a distal end of the corresponding deep groove-coil that is opposite to the stator iron core in an axial direction.

8 . The electric motor according to claim 5 , wherein the deepest slit is the combined use slit.

9 . A three-phase electric motor comprising:
a cylindrical stator iron core; a cylindrical insulator that is in contact with an end portion in an axial direction of the stator iron core; and a plurality of coils, wherein the stator iron core includes a plurality of teeth, and a number of teeth is a multiple of three, the insulator includes a plurality of winding bodies, the winding bodies face the teeth in the axial direction, the coils are wound around the teeth and the winding bodies facing each other, among the plurality of coils, coils in a same phase are connected by series connection and are formed by one lead wire including connecting wires, and a plurality of slits for allowing the connecting wires to pass through are formed in the insulator, and when a slit, which has deepest depth among the plurality of slits, is represented as a deepest slit, a coil, from which the connecting wires passing through the deepest slit are drawn, is represented as a corresponding deep groove-coil, and the winding body, around which the corresponding deep groove-coil is wound, is represented as a corresponding deep groove-winding body, the deepest slit is provided such that at least a part of the deepest slit is located further on an outer side in a circumferential direction of the insulator than an extension region obtained by virtually extending the corresponding deep groove-winding body to an outer diameter side of the insulator, wherein an edge portion, which holds the connecting wires in the deepest slit, is provided on an outer side of a projection region where the corresponding deep groove-coil, from which the connecting wires are drawn, is virtually projected on the outer diameter side.

Assignees

• Fujitsu General Ltd

Inventors

• Nishio Tomoki

Classifications

• H02K3/28 Primary

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

• H02K2203/12

  Machines characterised by the bobbins for supporting the windings · CPC title

• H02K3/522

  for generally annular cores with salient poles · CPC title

• F04B39/00

  Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 · CPC title

• H02K3/345 Primary

  between conductor and core, e.g. slot insulation · CPC title