JP2000350388A - Rotating machine stator - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the surface loss of a rotor in a conventional stator, and
The winding workability of the armature coil cannot be compatible. SOLUTION: A plurality of stator teeth portions 9 having an extension portion extending in the axial direction of the cylinder from a cylindrical outer frame 9a and protruding in the axial center direction of the cylinder are provided. The width in the direction perpendicular to the surface of the portion is provided so as to protrude straight with the constant width 9W toward the center of the axis, and the tip of the stator teeth is provided at the tip of the stator teeth. The magnetic stay 7 is provided so as to protrude from both sides of the extension portion toward the adjacent stator teeth portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator having a structure for improving workability of a winding of a stator of a rotating machine and reducing a surface loss of the rotor.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing a conventional stator together with a rotor. 10A is a stator, 1A is a stator core laminated with a magnetic steel plate, 2A is a slot provided in the stator core 1A, 3A is a slot open, 4 is an armature coil wound on the stator core 1A, 5 is After the armature coil 4 has been wound around the slot 2, a wedge 6 is inserted to close the slot open 3A, and a plurality of stator teeth 6 form a part of the stator core 1A. Reference numeral 8 denotes a rotor that faces the stator teeth 6 via a gap g. That is, the stator core 1 </ b> A includes the cylindrical outer frame 19 a and the stator teeth 6. Each stator tooth portion 6 has an extension extending from the outer frame 19a in the axial direction of the cylinder and projects in the axial center direction of the cylinder. The distal end portion of each stator tooth portion 6 facing the rotor 8 is formed in a wide portion 6b, and its distal end surface 6c
Are formed in a shape along the outer periphery of the rotor 8. Each wide portion 6b forms the slot open 3A with an adjacent wide portion 6b.

[0003]

First, in general, in a rotating machine, when viewed from the rotor 8, the inner diameter of the opposed stator core 1A has a stator tooth portion 6 through which magnetic flux easily passes and a slot open 3A through which magnetic flux does not easily pass. Due to the continuation, magnetic flux pulsation occurs on the surface of the rotor 8. Due to the pulsation of the magnetic flux, surface loss due to the eddy current is generated on the surface of the rotor 8. In the stator 10A of the conventional rotating machine shown in FIG. 5, the tip side shape of the stator teeth 6 is widened to form a wide portion 6b, and the slot open 3A is formed only by the stator teeth 6. If priority is given to reducing the surface loss and the slot open 3A is set to a size smaller than the wire diameter of the armature coil 4, workability in the winding operation is significantly deteriorated. Also, when the slot open 3A is made large and the winding workability of the armature coil 4 is prioritized, the surface loss of the rotor 8 may be increased.

[0004] The present invention has been made to solve the above-mentioned problems, and therefore, a stator capable of reducing the surface loss of a rotor without deteriorating the workability of winding of an armature coil is obtained. The purpose is to:

[0005]

SUMMARY OF THE INVENTION A stator of a rotating machine according to the present invention has a plurality of stator teeth having an extended portion extending in the axial direction of a cylinder from a cylindrical outer frame and projecting in the axial direction of the cylinder. The stator teeth portion is provided so that the width in the direction perpendicular to the surface of the extension portion projects straight toward the center of the shaft with a constant width, and the stator teeth portion has a tip side. In addition, a magnetic stay is provided so as to protrude from both sides of the extended portion on the tip side of the stator teeth toward the adjacent stator teeth.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described. 1 is a sectional view showing a stator according to Embodiment 1 of the present invention together with a rotor, FIG. 2 is a perspective view showing a magnetic stay provided on the stator according to Embodiment 1 of the present invention, and FIG. 3 is a stator. It is the elements on larger scale of the tip side of a teeth part. In FIG.
10 is a stator, 1 is a stator core laminated with a magnetic steel sheet,
2 is a slot provided on the stator 1, 3 is a slot open, 4 is an armature coil wound on the stator 1, and 5 is a slot for closing the slot open 3 after the armature coil 4 is wound on the slot 2. A wedge 9 made of an insulating material to be inserted, 9 is a stator teeth portion forming a part of the stator 1, 7 is a magnetic stay made of a magnetic material, and an armature coil 4 is wound around a slot 2. After stator teeth part 9
Is mounted on the distal end side of the stator teeth portion 9 along a cutout recess 9b provided on the distal end side of the stator teeth portion. 8
Is a rotor that faces the stator teeth 9 and the magnetic stay 7 via a gap g.

That is, the stator teeth portion 9 does not have the wide portion 6b on the distal end side unlike the conventional stator teeth portion 6, but has a wide portion formed by attaching the magnetic stay 7 thereto. That is, each of the stator teeth portions 9 protrudes straight from the cylindrical outer frame 9a of the stator core 1 in the center direction with a constant width of 9W. On the distal end side of each stator tooth portion 9, a surface 9h extending in the axial direction is provided.
Notches 9b, 9b are formed in 9h along the axial direction. In addition, the tip surface 9c of the stator teeth 9 is
The rotor 8 is formed in an arc shape so as to face along the outer circumference. As can be seen from FIGS. 1 to 3, the magnetic stays 7 are opposed to each other via a groove 7 a having a width slightly smaller than the width 9 W of the stator teeth 9.
b, and a base piece 7c connecting one end of these magnetic stay pieces 7b, 7b. When the magnetic stay pieces 7b are attached to the stator teeth 9, the magnetic stays 7b are formed in a shape that spreads in a skirt shape from the tip side of the stator teeth 9 and protrudes to both sides of the stator teeth 9. ing. The bottom surfaces 7d of the magnetic stay pieces 7b, 7b are formed in an arc shape so as to form a gap g, facing the circular outer periphery of the rotor 8, and the back surfaces 7e, 7e are substantially tapered. . On the groove 7a side of each magnetic stay piece 7b, 7b,
Protrusions 7t, 7t fitted and locked in the recesses 9b, 9b
Having. The magnetic stay 7 includes magnetic stay pieces 7b,
The protrusions 7t, 7t of the stator teeth 9b are inserted into the recesses 9b, 9b of the stator teeth 9, and the base 7c is slid until the base piece 7c comes into contact with one end of the stator teeth 9 in the axial direction.
Is mounted so as to sandwich the stator teeth 9 and then fixed.

That is, the conventional stator teeth 6 shown in FIG.
In place of the wide portion 6c, a magnetic stay 7 that can be attached to the distal end side of the stator teeth portion 9 having a straight cross section after the winding operation is used.

According to the stator 10 of the rotating machine according to the first embodiment, the magnetic stay 7 is inserted into the inner diameter side of the stator teeth 9 after the winding work, and the magnetic stay 7 forms the slot open 3. Therefore, it is possible to set the slot open 3 which is optimal in design irrespective of the wire diameter of the armature coil 4, and the magnetic flux pulsation on the surface of the rotor 8 can be reduced, so that the eddy current is reduced and the surface loss is reduced. . Also,
Since the stator teeth portion 9 does not have a wide portion on the distal end side, the workability of winding is improved. Therefore, after the winding operation of the armature coil 4, the magnetic stay 7 is attached to the tip end side of the stator teeth 9, so that the dimension of the slot open 3 formed by the magnetic stays 7 adjacent to each other is changed. The setting can be made without being affected by the wire diameter. Therefore, a stator can be obtained in which the workability of the winding of the armature coil 4 is not deteriorated and the surface loss of the rotor 8 can be reduced.

Embodiment 2 Instead of the magnetic stay used in the first embodiment, a magnetic stay that has been subjected to insulation treatment may be used. FIG. 4 is a perspective view of a magnetic stay used in the second embodiment. In FIG. 4, reference numeral 7A denotes a magnetic stay according to the second embodiment, and each magnetic stay piece 7b,
In FIG. 7b, the back surface 7e, 7e opposite to the side facing the rotor 8 is subjected to insulation treatment X by, for example, baking coating of epoxy powder.

[0011] As the insulating treatment X, instead of baking coating of epoxy powder, it is also possible to apply insulating paper or the like. When such a magnetic stay 7A is used, the wedge 5 becomes unnecessary when the dimension of the slot open 3 is smaller than the wire diameter of the armature coil 4.

In each of the above embodiments, the magnetic stay 7 or 7A in which two magnetic stay pieces 7b, 7b are connected.
Has been described, but the two magnetic stay pieces 7b, 7b are separately provided, and the magnetic stays which are attached to each other so as to protrude from both sides of the tip side of the stator teeth portion 9 are used as the magnetic stays. Is also good. Also, a magnetic stay that does not have the recesses 9b, 9b formed in the stator teeth portion 9 and does not have the projections 7t, 7t corresponding to the recesses 9b, 9b is prepared and fixed with an adhesive or the like. You may make it fix to the stator teeth part 9 by a means.

[0013]

As described above, according to the present invention, the stator teeth are formed so as to protrude straight with a constant width, and the magnetic stay is provided on the tip side of the stator teeth. Therefore, a stator can be obtained that does not deteriorate the workability of the winding of the armature coil and that can reduce the surface loss of the rotor. In addition, the use of a magnetic stay with an insulating treatment on the surface opposite to the side facing the rotor eliminates the need for wedges, lowering the space factor even with the same winding specification, and manufacturing the winding Cost and quality improvements can be expected.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a stator according to a first embodiment together with a rotor.

FIG. 2 is a perspective view of a magnetic stay used in the first embodiment.

FIG. 3 is an enlarged view of FIG. 1;

FIG. 4 is a perspective view of a magnetic stay used in the second embodiment.

FIG. 5 is a cross-sectional view showing a stator in a conventional branch operation together with a rotor.

[Explanation of symbols]

1 Stator, 2 slots, 3 slots open, 4
Armature coil, 5 wedges, 9 stator teeth, 7 magnetic stay, 7b, 7b magnetic stay pieces 8, 9
a Outer frame.

Claims (4)

[Claims] 1. A stator having a plurality of stator teeth extending from a cylindrical outer frame in the axial direction of the cylinder and projecting in the axial center direction of the cylinder. In the stator of the rotating machine having the child coil, the stator teeth portion is provided so that the width in the direction perpendicular to the surface of the extension portion is straightly protruded toward the axis center with a constant width, A magnetic stay is provided on the distal end side of the stator tooth portion so as to protrude from both sides of the extended portion on the distal end side of the stator tooth portion toward the adjacent stator tooth portion. Rotating machine stator. 2. A groove extending in the axial direction and fitted with a part of the magnetic stay is provided on both sides of the extended portion at the distal end side of the stator teeth portion. The stator of the rotating machine according to claim 1. 3. The magnetic stay according to claim 1, wherein the magnetic stay includes two magnetic stay pieces connected at a portion corresponding to one axial end of the stator teeth. 3. The stator of the rotating machine according to 2. 4. The magnetic stay according to claim 1, wherein the surface of the magnetic stay opposite to the side facing the rotor is subjected to insulation treatment. Rotating machine stator.