WO2017130274A1

WO2017130274A1 - Stator for rotary electric machine

Info

Publication number: WO2017130274A1
Application number: PCT/JP2016/052001
Authority: WO
Inventors: 長谷川　覚
Original assignee: 三菱電機株式会社
Priority date: 2016-01-25
Filing date: 2016-01-25
Publication date: 2017-08-03

Abstract

This stator for a rotary electric machine has an insulator provided between a coil and a teeth part of a stator iron core. The insulator has: an electric wire winding section on which an electric wire constituting the coil is wound; and a flange section projecting outward from the electric wire winding section. The electric wire winding section has a plurality of projected parts provided successively in the radial direction of the stator iron core, and a varnish reservoir part is provided between the projected parts adjacent to each other. The flange section is provided with a varnish introduction groove connected to the varnish reservoir part. The surface of each of the projected parts in contact with the electric wire is formed so as to be circular.

Description

Rotating electric machine stator

This invention relates to a stator of a rotating electric machine in which a coil is provided on a tooth portion of a stator core via an insulator.

In a conventional stator of a rotating electric machine, a varnish guide hole is provided in a flange portion of an insulator. The varnish guide hole has a varnish dripping port and a guide hole outlet. A varnish guide groove connected to the guide hole outlet is provided in a portion where the electric wire of the insulator is wound. After the electric wire is wound around the insulator, the varnish is dropped into the varnish dropping port, thereby impregnating the varnish inside the coil (for example, see Patent Document 1).

Further, in the conventional coil bobbin, three or more winding surfaces protruding in a mountain shape are provided in the coil winding portion, and a groove portion is provided from the outer end of the flange portion to the winding surface (see, for example, Patent Document 2). ).

JP 2014-7836 A Japanese Patent Laid-Open No. 9-92548

In the stator of the conventional rotating electrical machine shown in Patent Document 1, since the varnish induction groove is provided in a portion around which the electric wire of the insulator is wound, when the electric wire is wound around the insulator, the electric wire is formed at the corner of the edge of the groove. The insulation film of the electric wire is damaged and the insulation performance of the coil is lowered. Further, the varnish guide groove has one stator radial groove and a plurality of stator circumferential grooves, and the direction in which the wire is wound and the direction of the stator circumferential groove are the same. Enters the circumferential groove of the stator, the rows of wires are disturbed, and the space factor of the wires decreases.

In the conventional coil bobbin shown in Patent Document 2, since three or more winding surfaces protruding in a mountain shape are provided in the coil winding portion, when this configuration is applied to the stator, the teeth portions face each other. Each surface protrudes in a mountain shape, and it is necessary to widen the teeth pitch to avoid interference between adjacent coils, which may limit the motor design. Moreover, when winding an electric wire around a coil winding part, an electric wire is pressed against the corner | angular part of a groove part, the insulation film of an electric wire is damaged, and the insulation performance of a coil falls.

The present invention has been made to solve the above-described problems, and prevents damage to the insulating coating of the electric wire and lowering of the space factor of the electric wire while ensuring the permeability of the varnish to the coil. An object of the present invention is to provide a stator for a rotating electrical machine that can avoid the restriction of the degree of freedom of teeth pitch.

A stator for a rotating electrical machine according to the present invention includes a stator core having a tooth portion, an electric wire, a coil provided in the tooth portion, and an insulator interposed between the tooth portion and the coil. Has an electric wire winding part around which the electric wire constituting the coil is wound, and a flange part protruding outward from the electric wire winding part, and the electric wire winding part has a radial direction of the stator core. A plurality of continuous projections are provided, a varnish reservoir is provided between adjacent projections, and a varnish introduction groove connected to the varnish reservoir is provided on the flange, and each projection The surface of the part that contacts the electric wire is rounded.

The stator of the rotating electrical machine of the present invention is provided with a plurality of projections that are continuous along the radial direction of the stator core, and a varnish reservoir is provided between adjacent projections. Because the surface that touches the wire of the part is rounded, it is possible to prevent damage to the insulation film of the wire and decrease in the space factor of the wire while ensuring the permeability of the varnish to the coil. It can be avoided that the freedom of teeth pitch is limited.

It is sectional drawing which shows the half of the cross section in alignment with the axis line of the elevator hoisting machine by Embodiment 1 of this invention. It is sectional drawing which shows the half of a cross section orthogonal to the axis line of the winding machine of FIG. It is sectional drawing which shows the perimeter of the cross section orthogonal to the axis line of the stator of FIG. It is the side view which looked at the one teeth part of the state except the coil of FIG. 3 along the circumferential direction of the stator core. It is a perspective view which shows the insulator of FIG. It is sectional drawing of the part of the protrusion part and varnish reservoir part of the insulator of FIG. It is sectional drawing of the part of the varnish introduction groove | channel of the insulator of FIG. It is sectional drawing which shows the 1st modification of the varnish reservoir part of FIG. It is sectional drawing which shows the 2nd modification of the varnish reservoir part of FIG. It is sectional drawing which shows the 3rd modification of the varnish reservoir part of FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
1 is a cross-sectional view showing a half of a cross section along the axis of an elevator hoist according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view showing a half of a cross section perpendicular to the axis of the hoist of FIG. is there. In the figure, a bowl-shaped outer frame 1 includes a disk part 1a, a shaft part 1b protruding from the center of the disk part 1a to one side in the axial direction, and one side in the axial direction from the outer peripheral part of the disk part 1a. And a cylindrical stator mounting portion 1c that protrudes toward the center.

Rotating body 3 is supported on shaft 1b via a pair of bearings 2. The rotating body 3 rotates about the shaft portion 1b with respect to the outer frame 1. The rotating body 3 has a cylindrical magnet mounting portion 3a.

A sheave 4 is fixed to one side of the rotating body 3 in the axial direction. The sheave 4 rotates integrally with the rotating body 3 around the shaft portion 1b. A suspension body (not shown) for suspending a cage (not shown) and a counterweight (not shown) is wound around the sheave 4. The cage and the counterweight move up and down as the sheave 4 rotates.

The hoisting machine motor 5 that rotates the sheave 4 includes a permanent magnet 6 fixed to the outer peripheral surface of the magnet mounting portion 3a and a stator 7 fixed to the inner peripheral surface of the stator mounting portion 1c. is doing. The permanent magnet 6 and the stator 7 are opposed to each other. The stator 7 has a stator core 8 and a plurality of coils 9.

The stator core 8 has an annular core back portion 8a and a plurality of teeth portions 8b protruding radially inward from the core back portion 8a. The teeth part 8b is provided at equal intervals in the circumferential direction of the core back part 8a.

A disc-shaped cover 10 covering the hoisting machine motor 5 is fixed to the end of the stator mounting portion 1c opposite to the disc portion 1a. A circular opening 10 a through which the sheave 4 passes is provided in the center of the cover 10.

The outer frame 1 supports a pair of hoisting machine brakes 11 (not shown in FIG. 1) that brake the rotation of the rotating body 3 and the sheave 4. Each hoisting machine brake 11 includes a brake shoe 12, a brake spring (not shown) that presses the brake shoe 12 against the inner peripheral surface of the magnet mounting portion 3a, and the brake shoe 12 from the magnet mounting portion 3a against the brake spring. And an electromagnetic magnet 13 to be pulled apart.

FIG. 3 is a cross-sectional view showing the entire circumference of a cross section perpendicular to the axis of the stator of FIG. The stator core 8 is configured by arranging a plurality of core blocks in the circumferential direction. Each coil 9 is comprised by the electric wire 9a wound around the teeth part 8b. Moreover, the electric wire 9a is wound around the teeth part 8b by the concentrated winding method. Furthermore, the electric wire 9a is wound in several layers with the gap as small as possible and with as much alignment as possible. Thereby, the space factor of the electric wire 9a is raised.

4 is a side view of one tooth portion 8b in a state where the coil 9 of FIG. 3 is removed as viewed along the circumferential direction of the stator core 8, and the right side of FIG. 4 is the tip of the tooth portion 8b. Further, the left-right direction in FIG. 4 is the radial direction of the stator core 8, and the up-down direction in FIG. 4 is the axial direction of the stator core 8.

A pair of insulators 21 are interposed between the teeth portion 8 b and the coil 9. The insulator 21 is attached to the tooth portion 8b from both sides of the stator core 8 in the axial direction.

FIG. 5 is a perspective view showing the insulator 21 of FIG. Each insulator 21 has a U-shaped wire winding portion 21a around which the electric wire 9a is wound, a first flange portion 21b protruding outward from the end of the wire winding portion 21a on the tip side of the tooth portion 8b, And a second flange portion 21c protruding outward from the end portion of the wire winding portion 21a on the core back portion 8a side.

A plurality of bank-like protrusions 21 d that are continuous along the radial direction of the stator core 8 are provided on the outer surface of the portion of the wire winding portion 21 a that is in contact with the axial end surface of the stator core 8. Thereby, the varnish reservoir part 21e is provided between the adjacent protrusion parts 21d. In this example, one insulator 21 is provided with two protrusions 21d and one varnish reservoir 21e. The varnish reservoir 21e intersects the winding direction of the electric wire 9a, and is orthogonal here.

A plurality of first varnish introduction grooves 21f connected to the varnish reservoir portion 21e are provided on the surface of the first flange portion 21b on the coil 9 side. A plurality of second varnish introduction grooves 21g connected to the varnish reservoir portion 21e are provided on the surface of the second flange portion 21c on the coil 9 side.

The first and second

varnish introduction grooves

21f and 21g are provided in a straight line continuously from the varnish reservoir 21e to the end face of the insulator 21 in the axial direction of the stator core 8. In this example, two first and second

varnish introduction grooves

21f and 21g are provided for each varnish reservoir 21e.

The surface in contact with the electric wire 9a of each protrusion 21d is rounded. Specifically, as shown in FIG. 6, the corners on both sides of the tip of the protrusion 21d are rounded.

Also, the edge of each

varnish introduction groove

21f, 21g is rounded. Specifically, as shown in FIG. 7, the

varnish introduction grooves

21 f and 21 g are rounded at the edges on both sides in the width direction.

The width dimension of the varnish reservoir portion 21e (dimension in the direction perpendicular to the paper surface in FIG. 4) is larger than the width dimension of the

varnish introduction grooves

21f and 21g (dimension in the direction perpendicular to the paper surface in FIG. 4).

The insulator 21 has a thin portion and a thick portion having a thickness dimension larger than that of the thin portion, and the varnish reservoir portion 21e and the

varnish introduction grooves

21f and 21g are provided only in the thick portion. In other words, the portions where the varnish reservoir 21e and the

varnish introduction grooves

21f and 21g in FIGS. 4 and 5 are provided are thick portions.

The thick-walled portion is a portion related to improvement of the winding workability of the electric wire 9a, and even if the varnish reservoir portion 21e and the

varnish introduction grooves

21f and 21g are provided, the insulating performance of the insulator 21 is not affected.

After the coil 9 is formed in the teeth portion 8b and the connection between the coils 9 is performed, the coil 9 is impregnated with varnish. At this time, the varnish is hung on at least one of the

varnish introduction grooves

21 f and 21 g and the surface layer of the coil 9. A part of the varnish hung down reaches the varnish reservoir 21e. By dropping an appropriate amount of varnish, it is possible to penetrate the varnish throughout the coil 9 even for a coil having a high space factor.

In such a stator of a rotating electrical machine, by providing a plurality of projections 21d that are continuous along the radial direction of the stator core 8, a varnish reservoir 21e is provided between adjacent projections 21d. And since the surface which touches the electric wire 9a of each protrusion part 21d is rounded, damage to the insulation coating of the electric wire 9a and the space factor of the electric wire 9a are ensured while ensuring the permeability of the varnish to the coil 9. Can be prevented.

Further, since the adjacent surfaces of the teeth portion 8b do not protrude in a mountain shape, it is not necessary to increase the teeth pitch, and it is possible to avoid limiting the freedom of the teeth pitch.

Furthermore, since the width dimension of the varnish reservoir 21e is larger than the width dimension of the

varnish introduction grooves

21f, 21g, the varnish smoothly moves to the varnish reservoir 21e without staying in the

varnish introduction grooves

21f, 21g. This makes it easy for the varnish to penetrate the entire coil 9.

Furthermore, since two or more

varnish introduction grooves

21f and 21g are provided for one varnish reservoir 21e, the varnish can be more rapidly permeated to the inner layer of the coil 9.

Further, since the varnish reservoir portion 21e and the

varnish introduction grooves

21f and 21g are provided only in the thick portion of the insulator 21, the insulation performance of the insulator 21 can be more reliably maintained.

Furthermore, since the edges of the

varnish introduction grooves

21f and 21g are also rounded, damage to the insulating coating of the electric wire 9a can be prevented more reliably.

In the above example, one insulator 21 is provided with two protrusions 21d and one varnish reservoir 21e. However, three or more protrusions 21d are provided and two or more varnish reservoirs 21e are provided. It may be divided. Further, the number of

varnish introduction grooves

21f and 21g is not limited to the above example. That is, the number and arrangement of the varnish reservoir 21e and the

varnish introduction grooves

21f and 21g can be appropriately set according to the viscosity of the varnish, the diameter of the coil 9, and the like.

In the above example, the first and second

varnish introduction grooves

21f and 21g are provided in one insulator 21, but only one of them may be provided.
Furthermore, in the above example, the same two insulators 21 are mounted on one tooth portion 8b, but they are not necessarily the same. For example, one insulator 21 may omit the varnish reservoir 21e and the

varnish introduction grooves

21f and 21g.

Furthermore, in the above example, the entire varnish reservoir 21e has the same depth dimension, but a recess is provided in the bottom surface of the varnish reservoir 21e to partially change the depth dimension of the varnish reservoir 21e. Also good. That is, in order to further improve the varnish penetration into the coil 9 due to the viscosity of the varnish, a recess may be provided at one end, both ends, or the center of the varnish reservoir 21e in the radial direction of the stator core 8. In this case, the bottom surface of the varnish reservoir 21e may be inclined to gradually change the depth dimension along the radial direction of the fixed iron core 8.

FIG. 8 shows a modification in which the depth dimension of the varnish reservoir 21e is gradually increased from both radial ends of the fixed iron core 8 toward the central portion. FIG. 9 shows a modification in which the depth dimension of the varnish reservoir portion 21e is gradually increased from one end portion in the radial direction of the fixed iron core 8 toward the other end portion. FIG. 10 shows a modification in which the depth dimension of the varnish reservoir portion 21e is gradually increased from the radial center portion of the fixed core 8 toward both end portions.

In the above example, the rotor having the permanent magnet 6 is disposed inside the stator 7. However, the present invention can also be applied to a type of stator disposed inside the rotor.
Furthermore, the present invention can also be applied to stators of various rotating electric machines other than elevator hoisting machines.

Claims

A stator core having teeth,
A coil provided in the tooth portion, and an insulator interposed between the tooth portion and the coil,
The insulator has an electric wire winding portion around which an electric wire constituting the coil is wound, and a flange portion protruding outward from the electric wire winding portion,
The wire winding portion is provided with a plurality of protrusions continuous along the radial direction of the stator core, and a varnish reservoir is provided between the adjacent protrusions,
The flange portion is provided with a varnish introduction groove connected to the varnish reservoir portion,
A stator of a rotating electrical machine in which a surface of each of the protrusions contacting the electric wire is rounded.
The stator for a rotating electrical machine according to claim 1, wherein a width dimension of the varnish reservoir is larger than a width dimension of the varnish introduction groove.
The stator for a rotating electrical machine according to claim 2, wherein two or more varnish introduction grooves are provided for one varnish reservoir.
The insulator has a thin part and a thick part having a thickness dimension larger than that of the thin part,
The stator of a rotating electrical machine according to any one of claims 1 to 3, wherein the varnish reservoir and the varnish introduction groove are provided only in the thick portion.
The stator of the rotating electrical machine according to any one of claims 1 to 4, wherein an edge of the varnish introduction groove is also rounded.
The hollow of the varnish reservoir part is provided in the bottom face, The depth dimension of the varnish reservoir part is changing along the radial direction of the fixed iron core. The stator of the described rotating electrical machine.