JP2003264944A - Stator core assembly of motor, and method of mounting stator assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator core assembly little in leakage of a magnetic flux from stator core segments to an annular member, and a suitable method for assembling the stator assembly. <P>SOLUTION: The stator core assembly 30 is composed of a plurality of stator core segments and the annular member 32. The plural fan-shaped stator core segments 12 are annularly arranged, with paired flanks abutted against each other, and in that condition, they are press-fitted within an inside peripheral face of the annular member 32, whereby the stator core segments 12 are positioned. The annular member 32 is corrugated along the circumference, and there is space between the stator core segments 12 and the annular member 32. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor stator core assembly and a method of assembling the stator assembly.

[0002]

2. Description of the Related Art Currently, motors are used in all fields of industry. In the case of transportation equipment, a driving motor for an electric vehicle, a hybrid vehicle or the like can be given as an example.

Such a motor is mainly composed of a stator assembly for generating a rotating magnetic field by passing an electric current through a coil, and a rotor for rotating by receiving a force by the rotating magnetic field. FIG. 3 shows the structure of the stator core assembly 10 which is a part of the stator assembly. The stator core assembly 10 is a ring-shaped member 18 in which fan-shaped divided stator cores 12 formed by stacking electromagnetic steel plates are arranged in a ring shape by abutting the side surfaces thereof against each other.
It is formed by pressing into the inner peripheral surface of the. In this structure, the split stator core 12 is positioned and fixed by the annular member 18. Each split stator core 12
Is a laminate of a plurality of electromagnetic steel sheets punched into a planar shape having two stator tooth portions 16 extending from the yoke portion 14 toward the inner periphery to a position facing the rotor. A cassette coil wound in advance in a ring shape is mounted in the slots between the stator tooth portions 16.

Inside the stator core assembly 10, if the motor is a permanent magnet type motor, a rotor having a permanent magnet inside is arranged. If the motor is a reluctance type motor, the rotor shape and slits are used to change the direction. Rotors having different magnetic resistances are arranged.

[0005]

However, in the stator core assembly 10 of the motor described above, the magnetic flux generated by passing a current through the coil when the motor is driven is
There is a problem that the efficiency of the motor is lowered because the split stator core 12 travels through the annular member 18 and leaks to the outside.

Further, when the annular member 18 is formed by drawing a grain-oriented steel plate having different strength characteristics depending on the direction, such as a rolled steel plate, the annular member 18 can be formed by drawing using a cylindrical mold. The annular member 18 is deformed into an elliptical shape and does not have the shape as it is. As a result, the positioning of the split stator core 12 cannot be performed accurately, and the air gap between the tip of the stator tooth portion 16 and the rotor varies greatly for each split stator core 12. Therefore, the rotor receives a force from the split stator core when the motor is driven. There is a problem that there are variations and that the air gap must be designed to be large in consideration of the variations.

Further, in order to prevent the leakage magnetic flux from flowing between the stator tooth portions 16, the split stator core 12 is projected toward the stator tooth portions 16 adjacent to the tips of the stator tooth portions 16 as shown in FIG. In the case of the structure including the ear portion 20, there is a problem that the cassette coil cannot be inserted into the slot between the stator tooth portions 16 because of the presence of the ear portion 20.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a stator core assembly having a small leakage flux from the split stator core to the annular member, and a preferred method of assembling the stator assembly.

[0009]

According to the present invention, a plurality of fan-shaped divided stator cores are arranged in a ring shape by abutting the side surfaces thereof, and the divided stator cores are press-fitted into the inner peripheral surface of the annular member. A stator core assembly of a motor formed by positioning and fixing the split stator core, wherein the annular member is formed in a wave shape along a circumference.

The annular member is formed by drawing a steel plate or a non-ferrous metal.

Further, according to the present invention, a plurality of stator tooth portions extending from the annular yoke portion toward the inner circumference are included, and an ear portion protruding toward the adjacent stator tooth portion is provided at the tip of each stator tooth portion. A method of assembling a stator assembly, comprising: a stator core formed by laminating electromagnetic steel sheets having; and a cassette coil mounted in a slot between the stator tooth portions, wherein the ear portion is bent, A step of expanding the gap between the adjacent ears, a step of installing the cassette coil wound in a ring shape in advance on the stator teeth through the expanded gap, and a step of installing the folded ears. A shape restoration step of returning to the shape before folding.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A stator core assembly of a motor of the present invention and a method of assembling the stator assembly will be described.
A description will be given below with reference to the drawings.

FIG. 1 is a view of a stator core assembly 30 according to an embodiment of the present invention as seen from the press-fitting direction of the split stator core 12. The circular blank in the center of the stator core assembly 30 is a space in which the rotor is arranged.

The stator core assembly 30 of this embodiment is
It is composed of a plurality of split stator cores 12 and an annular member 32. Similar to the prior art, a plurality of fan-shaped split stator cores 12 are arranged in a ring shape with their side surfaces abutted against each other, and in that state, the split stator cores 12 are positioned by pressing into the inner peripheral surface of the annular member 32. It is fixed.

The split stator core 12 is constructed by laminating a plurality of electromagnetic steel plates. Each steel plate has a yoke portion 1 that serves as a magnetic path.
4, the stator tooth portion 16 extends in the inner circumferential direction,
Further, the end of the stator tooth portion 16 has a shape in which the ear portion 20 projects toward the adjacent stator tooth portion, and a desired pole tooth width is obtained. Each steel plate is laminated according to the shape,
By pressurizing in the stacking direction, stacking caulking is performed, and they are fixed to each other.

The side surface of the annular member 32 is formed in a wave shape along the circumference. Such a wavy ring member 32
Can be obtained by drawing a rolled steel plate or extruding. This wavy ring member 3
In 2, the split stator core 12 is press-fitted into the convex portion inside the annular member 32, and only the convex portion is divided stator core 12
Is supporting. The state of being supported by the convex portion is as shown in the AA cross section in FIG. Further, there are two convex portions of the annular member 32 for each divided stator core 12. The number of convex portions may be equal to the number of divided stator cores 12, or may be an integral multiple.

What is characteristic of the stator core assembly 30 of the present embodiment described above is that the annular member 32 is formed in a wavy shape. Since the split stator core 12 and the annular member 32 have a gap in a portion other than the convex portion by being formed into a wavy shape, magnetic resistance is large in that portion, and leakage of magnetic flux from the divided stator core 12 to the annular member 32 is prevented. There is an effect that can be prevented.

When the corrugated annular member 32 is formed by drawing a steel plate, a large distortion is applied to the steel plate when it is plastically processed into a corrugated form. Is hardened to increase the strength of the steel material itself and improve shape fixability. Therefore, the annular member formed in a corrugated shape is hard to be deformed, and there is an effect that it can be prevented from being distorted in an elliptical shape.

Next, with reference to FIG. 2, as to the method of assembling the stator assembly, in which the cassette coil formed by previously winding in a ring shape is mounted in the slot positions between the stator tooth portions 16 of the stator core assembly 30 described above, refer to FIG. And explain.

First, as shown in FIG. 2 (a), a plurality of, for example, five, electromagnetic steel plates 22 punched into the shape of the yoke portion, the stator tooth portions 16 and the ears 20 which have already been explained are stacked, It is placed on a die 54 provided with holes for drawing. At this time, the stator teeth 16 are placed on the holes and the ears 20 are placed on the die. Die 54
On top of that, there is a forming punch 5 that moves up and down along a guide 52.
0 is arranged and the upper portion of the hole of the electromagnetic steel plate 22 is pressed by the forming punch 50 with a load applied from above to bend the ears 20 of the electromagnetic steel plate 22 and expand the gap between the adjacent ears 20. To do. The drawing process can be performed simultaneously with the laminating and caulking process of electromagnetic steel plates.

Next, as shown in FIG. 2B, the cassette coils 34 are mounted in the slots between the stator teeth 16 through the gaps between the ears 20 which are enlarged by bending the ears 20. Thus, in the present embodiment, the ear 20
The gap between the ears 20 is expanded by bending the
It is possible to install a cassette coil. The illustrated cassette coil 34 is formed by winding a winding and resin-molding it.

Then, as shown in FIG. 2 (c), the bent ear portion 20 is flattened to restore the flat shape before bending.

The stator assembly is constructed by repeating the procedure described above and gradually increasing the thickness of the magnetic steel sheet. In the flattening process from the second time onward, the bent electromagnetic steel sheet is placed on the electromagnetic steel sheet that has already been restored to a flat shape, and the sheet is pressed.

In the present embodiment, since the gap between the ears 20 is expanded by bending the ears 20 as described above, even when the ears 20 are present at the tips of the stator teeth 16, The effect is that the cassette coil 34 can be mounted.

In the prior art, as means for mounting the coil 34 in the slots between the stator tooth portions having the ears at the tips, the yoke of the stator core and the stator tooth portion are manufactured as separate parts, and the yoke of the stator tooth portion is There is a method in which the cassette coil is attached from one end to be connected and the stator tooth portion is joined to the yoke. However, this method causes a slight gap between the stator tooth portion and the yoke and deteriorates conduction of magnetic flux. Further, when the motor is driven, a force that attracts the stator tooth portion and the rotor is generated, but this force separates the joint between the stator tooth portion and the yoke portion. Therefore,
The method of assembling the stator assembly according to this embodiment is effective and effective as compared with such a conventional technique.

[0026]

In the stator core assembly according to the first aspect of the present invention, since the circular ring member is formed in a wave shape along the circumference, a gap is formed between the split stator core and the circular ring member, and the magnetic resistance increases. Therefore, there is an effect that the leakage magnetic flux flowing from the split stator core to the annular member can be reduced.

In the stator core assembly according to claim 2,
Since the annular member is formed by drawing the steel plate into a wavy shape, a large strain is applied to the steel plate to improve the shape fixability of the annular member, thus preventing the annular member from being distorted into an elliptical shape. There is an effect that can be.

In the method of assembling the stator assembly according to the third aspect, even if the stator teeth have ears at the tips thereof, the gap between the ears is expanded by bending the ears, so that the cassette coil is mounted. There is an effect that can be installed in the slot.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of a stator core assembly according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a procedure for assembling the stator assembly according to the embodiment of the present invention.

FIG. 3 is an explanatory view illustrating a conventional stator assembly.

FIG. 4 is an explanatory diagram showing a split stator core including an ear portion at a tip of a stator tooth portion.

[Explanation of symbols]

12 split stator cores, 14 yoke parts, 16 stator tooth parts, 20 ear parts, 30 stator core assembly, 3
2 Ring member.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5H002 AA02 AA07 AB04 AB07 AC06                       AE07                 5H605 AA08 BB05 BB10 CC01 DD03                       GG04                 5H615 AA01 BB01 BB07 BB08 BB14                       PP01 PP07 PP10 QQ02 SS04                       SS10 SS19 SS44 TT04

Claims (3)

[Claims] 1. A plurality of fan-shaped split stator cores are arranged in a ring shape by abutting the side surfaces thereof, and the split stator cores are positioned and fixed by press-fitting them into the inner peripheral surface of an annular member. A stator core assembly for a motor to be formed, wherein the annular member is formed in a wave shape along a circumference. 2. The stator core assembly for a motor according to claim 1, wherein the annular member is formed by drawing a steel plate. 3. An electromagnetic steel sheet including a plurality of stator tooth portions extending from an annular yoke portion toward an inner circumference, and having an ear portion protruding toward an adjacent stator tooth portion at a tip of each stator tooth portion. A method for assembling a stator assembly, comprising: a stator core formed by stacking; and a cassette coil mounted in a slot between each of the stator teeth, wherein the ears are bent to form adjacent ears. A gap expanding step of expanding the gap between them, a coil mounting step of mounting a cassette coil wound in a ring shape in advance to a stator tooth portion through the expanded gap, and a shape of the bent ear portion before bending. And a step of restoring the shape of the motor, the method for assembling a stator assembly of a motor.