JPH1042495A - Stator core of ac generator for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase generator output and improve efficiency, by occupying the aperture width of a slot formed between tooth-shaped cores which opens toward the movable core side, by a specific portion out of one pitch width of the tooth-shaped cores. SOLUTION: In a stator core 3, a plurality of nearly planar tooth-shaped cores 3b are peripherally arranged at equal intervals toward the center, from a cylindrical core main body 3a. The end surface of the tooth-shaped core 3 faces the stator. A slot 2 as a trench, parallel to a shaft, is formed between adjacent tooth-shaped cores 3b. In the tip part facing the rotor of each tooth- shaped core 3b, a protruding part 3c whose both sides protrude in the peripheral direction is formed, so that the area of a surface 3d facing the stator is increased. The dimension of slot aperture width A2, formed between the adjacent protruding parts 3c, occupies 33-37% of one pitch width B of the tooth-shaped cores 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator core for an automotive alternator.

[0002]

2. Description of the Related Art FIG. 3 is a perspective view showing a stator core of a conventional automotive alternator. FIG. 4 is an enlarged view of a portion P in FIG. The stator core 1 of the vehicle alternator has a substantially cylindrical shape. When assembled as a component of the vehicle alternator, the rotor, which is a movable iron core (not shown), is housed inside the cylinder. The stator core 1 includes a plurality of substantially plate-shaped toothed cores 1b from a cylindrical core body 1a.
Has a shape arranged at equal intervals in the circumferential direction toward the center. The end face of the toothed iron core 1b faces a rotor (not shown). A slot 2 which is a groove parallel to the axis is formed between adjacent toothed iron cores 1b.
When the stator core 1 is assembled as a stator,
A winding (not shown) is wound around each tooth core 1b to form a stator.

[0003] The winding is formed by an electric wire penetrating through one slot 2 from the lower side in FIG.
The three slots are meandered so as to pass back and forth in the axial direction in each of the three slots 2 so as to penetrate the slot 2 from the upper side to the lower side, and are wound around the toothed core 1b. You. And it winds around inside the iron core main body 1a, meandering between the several toothed iron cores 1b in this way. The winding of one layer wound in this way is shifted by one slot in the circumferential direction and wound by three layers. In general, the winding is fixed at another location in advance by winding the thus formed meandering winding into each slot 2 for three layers and then hardening it with a varnish.

[0004] The distal end of each toothed core 1b facing the rotor has a protruding portion 1c formed with both ends protruding so that the end face extends in the circumferential direction. This is devised so that the area of the facing surface 1d facing the stator increases. That is, the tooth-shaped iron core 1b has a T-shaped cross section, and is designed so that the area of the facing surface 1d increases. On the other hand, the opening width A1 of the slot 2 formed between the toothed iron cores 1b is narrowed by the provision of the protruding portion 1c.

[0005] The stator core 1 is made of a laminated steel sheet in which a number of thin iron plates are laminated in the axial direction. In the process of manufacturing the stator core 1, generally, a band-shaped iron plate formed in a cross-sectional shape of the stator core 1 is spirally turned many times and laminated in a cylindrical shape, and both ends of the band are cylindrical. It is manufactured by welding to the end face.

[0006]

In the stator core 1 of the conventional vehicular alternator constructed as described above, the protruding portion 1c is made as large as possible so that the area of the facing surface 1d is increased. However, a bundled winding must be inserted into the slot 2. Therefore, the minimum opening width A1 in which the winding can be inserted is secured, and the protruding portion 1c protrudes to the maximum. The size of the slot opening width A1 formed between the adjacent protrusions 1c occupies 32% of one pitch width B of the toothed core 1b.

However, the size of the slot opening width A1 configured as described above is a minimum width simply allowing the bundled winding to be inserted, and takes into account the efficiency and output of the generator. Was not.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a stator core for an AC generator for a vehicle in which the output of the generator is increased, the efficiency is improved, and the non-defective product rate of winding insertion is increased.

[0009]

According to the first aspect of the present invention, in the stator core of the automotive alternator, the slot opening width opened toward the movable core side of the slot formed between the respective toothed cores. Occupy 33% to 37% of one pitch width of the toothed core.

[0010] In the stator core of the alternator for a vehicle according to the second aspect, the size of the slot opening opened toward the movable core side of the slot formed between the respective toothed cores is equal to the width of the toothed core. It occupies 34% to 35% of one pitch width.

According to a third aspect of the present invention, the stator core of the automotive alternator is made of a laminated steel plate.

According to a fourth aspect of the present invention, the stator core of the automotive alternator has 36 toothed cores.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is an enlarged view of a main part showing a stator core of a vehicle alternator according to the present invention. FIG. 2 is a graph showing characteristics of a vehicle AC generator using the stator core of the present invention. In FIG. 1, a stator core 3 of the present embodiment has a plurality of substantially plate-shaped toothed cores 3b extending from a cylindrical core body 3a in the circumferential direction toward the center similarly to a conventional stator core. It has a shape that is arranged at intervals. The end face of the toothed core 3b faces a rotor (not shown). And
Slots 2 which are grooves parallel to the axis are formed between the adjacent toothed iron cores 3b.

The distal end of each toothed core 3b facing the rotor also has a projection 3c formed so that both sides protrude in the circumferential direction as in the prior art, and the area of the facing surface 3d facing the stator is formed. It is devised to increase the number. However, in the stator core 3 of the present embodiment, the size of the slot opening width A2 formed between the adjacent protrusions 3c occupies 35% of one pitch width B of the toothed core 3b. doing.

In FIG. 2, the abscissa represents the ratio of the slot opening width to one pitch width B of the toothed core 3b in percentage. The vertical axis also shows the output, efficiency, and non-defective rate of winding insertion of the AC generator using the stator core 3. The curves in the figure show changes in output, efficiency, and non-defective product rate of winding insertion when the slot opening width is gradually increased. The one-dot chain line shows the efficiency. The solid line indicates the output. The broken line indicates the non-defective rate of insertion of the winding.

Output is the product of the voltage and current output by the alternator. Efficiency is the ratio of the output to the input determined from the torque and speed of rotation of the shaft of the alternator. The non-defective product ratio of the winding insertion indicates a ratio when the winding is inserted into the slot 2 normally in the process of automatically assembling the AC generator. The data in this graph was obtained by measuring the output, efficiency, and non-defective rate of winding insertion in each case while gradually increasing the opening width of the slot.

In the characteristics of the AC generator shown in this graph, the efficiency is sharply poor at an efficiency of less than 33%. On the other hand, the output suddenly deteriorates when the output exceeds 37%. The non-defective rate of insertion of the winding increases as the slot opening width increases. Considering the three characteristics in total, slot 2
Opening width of 33% to 37% of the pitch width of the toothed core 3b
, And the best is around 34% to 35%. This characteristic is caused only by the opening width of the slot 2. That is, it is caused only by the ratio of the size of both the facing surface 3d and the opening width, and is not related to the change in the shape of the other portion. For example, it is not related to a change in the thickness or length of the toothed core 3b or a change in the thickness of the cylindrical core body 3a.

This data is data of the stator core 3 which is made of laminated steel plates as in the conventional example, has 36 toothed cores 3b, and has 12 magnetic poles of the opposed rotor. . However, it has been confirmed that the same characteristics are obtained even in the case of not being made of a laminated steel sheet or the case where the number of the toothed cores 3b is other than 36, for example, 48.

[0019]

In the stator core of the automotive alternator according to the first aspect, the size of the slot opening width of the slot formed between the respective toothed cores toward the movable core side is as follows.
The pitch occupies 33% to 37% of one pitch width of the toothed core. For this reason, the output of the generator is increased, the efficiency is improved, and the non-defective rate of winding insertion is increased.

In the stator core of the alternator for a vehicle according to the second aspect, the size of the slot opening width of the slot formed between the respective toothed cores toward the movable core side is determined by the size of the toothed core. It occupies 34% to 35% of one pitch width. Therefore, the output of the generator is further increased, and the efficiency is further improved.

According to a third aspect of the present invention, the stator core of the automotive alternator is made of a laminated steel plate.
Therefore, the output of the generator is further increased, and the efficiency is further improved.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part showing a stator core of an automotive alternator according to the present invention.

FIG. 2 is a graph showing characteristics of an automotive alternator using the stator core of the present invention.

FIG. 3 is a perspective view showing a stator core of a conventional automotive alternator.

FIG. 4 is an enlarged view of a portion P in FIG. 3;

[Explanation of symbols]

3 stator core, 3a core body, 3b toothed core, 2
Slot, A2 Slot opening width, B 1 of toothed core
Pitch width.

Claims (4)

[Claims] 1. A plurality of toothed cores are provided from a cylindrical core body at equal intervals in a circumferential direction toward an inner movable core side, and a winding is wound around each toothed core. In the stator core of the automotive alternator, the size of the slot opening between the toothed cores, which is open toward the movable core side, is one pitch width of the toothed core. A stator core for a vehicle alternator, wherein the stator core occupies 33% to 37% of the size. 2. A plurality of tooth-shaped cores are provided from a cylindrical core body at equal intervals in a circumferential direction toward an inner movable core side, and a winding is wound around each tooth-shaped core. In the stator core of the automotive alternator, the size of the slot opening between the toothed cores, which is open toward the movable core side, is one pitch width of the toothed core. A stator core for a vehicle alternator, wherein the stator core occupies 34% to 35% of the size. 3. The stator core of an automotive alternator according to claim 1, wherein the stator core is made of a laminated steel sheet. 4. The stator core for a vehicle alternator according to claim 1, wherein said stator core has 36 toothed cores.