JPH01194841A - Induction motor stator and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain a high efficiency and low cost motor stator by reducing a winding level and making the dimensions of an end coil smaller for decreasing a copper loss. CONSTITUTION:After the small coil 3a of a main winding 3 has been wound round the tooth 8a of an iron core 1, a large coil 3b is wound round teeth 8c and 8d. Then, in a main winding 3' adjacent to said main winding 3, a small coil 3a' is first wound round the tooth 8a and the large coil 3b' thereof, round the teeth 8c and 8d so as to overlap with said small coil 3a', in the direction opposite to that of the main winding 3. Thus, all of said main windings 3, 3' are wound by repetition of said operation. After that, the small coil 4a of an auxiliary winding 4 is wound round the tooth 8b of the iron core 1 and a large coil 4b, round the teeth 8c and 8d so as to overlap with said small coil 4a. Then, in an auxiliary winding 4' adjacent to said auxiliary winding 4, a small coil 4a' is wound round the tooth 8b and a large coil 4b', round the teeth 8c and 8d so as to overlap with said small coil 4a', in the direction opposite to that of the auxiliary winding 4. Thus, all of said auxiliary windings 4, 4' are wound by repetition of said process. In this manner, it is possible to obtain a high efficiency stator with little cop per loss, because the dimensions of upper and lower end coils 2 of the iron core 1 can be minimized.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a stator for an induction motor and a method for manufacturing the same, and particularly to a stator for a four-pole induction motor around which a main winding and an auxiliary winding are wound. The present invention relates to a stator of an induction motor suitable for reducing the height and a method of manufacturing the same.

[Prior art] The stator of a conventional induction motor is disclosed in Japanese Patent Publication No. 61-55329.
As described in the publication, the end coils of the main winding and the auxiliary winding were formed circumferentially along the inner periphery of the stator core.

[Problems to be Solved by the Invention] The above conventional technology will be explained with reference to FIGS. 9 and 10.

FIG. 9 is a plan view of a stator of a conventional induction motor described in Japanese Patent Publication No. 61-55329, and FIG. 10 is a partially exploded view of the stator of FIG. 9 viewed from the inner diameter side.

In the stator shown in FIG. 9, the teeth 8A of the stator core (hereinafter simply referred to as the core) IA are formed in a shape that extends straight toward the center of the core, and the main winding 3A is connected to the end coil 2A of the stator core IA. The auxiliary winding 4A is wound in a circumferential manner along the inner circumference of the iron core IA, and the end coil 2 of the auxiliary winding 4A is similarly wound.
A' is located inside the main winding 3A and is wound so as to be formed in a circumferential shape along the inner periphery of the iron core IA.

As shown in FIG. 10, the windings were wound around the iron core 1A at a considerable distance from the upper and lower ends thereof. Moreover, one slot insulator 1, 1 was inserted into each slot.

Because of this structure, conventional stators have large end coils, and as is well known, the end coils are located outside the iron core and have no effect on generating main magnetic flux, so the end coils generate less magnetic flux. The disadvantage was that there was a lot of copper loss.

In addition, there is a disadvantage in that the cost is high because a large amount of electric wire is consumed.

The present invention was devised to solve the above-mentioned problems of the prior art, by reducing the height of the winding, reducing the dimensions of the end coil, and reducing the copper loss generated from the end fill part.
The object of the present invention is to provide a highly efficient and inexpensive stator for an induction motor and a method for manufacturing the same.

[Means for Solving the Problems] In order to achieve the above object, the stator of an induction motor according to the present invention is an induction motor in which a main winding and an auxiliary winding are wound around the teeth of a stator core. In the stator, the main winding,
The teeth of the stator core around which the small coils of the auxiliary winding are wound are shaped so as to extend straight toward the center of the core, and the teeth of the stator core around which the large coils of the main winding and auxiliary winding are wound are shaped so that they extend straight toward the center of the core. The teeth are approximately parallel to the teeth around which the small coil of the main winding is wound in the part where the large coil of the main winding is to be wound, and are parallel to the center of the iron core in the part where the large coil of the auxiliary winding is to be wound. After winding the main winding and the auxiliary winding, the main winding's N poles and S poles are connected, and the auxiliary winding's N and S poles are connected to each other. The comrades face each other in parallel with each other, and are wound inside the main winding in an approximately square shape when viewed from the upper and lower end coil sides of the stator core. The auxiliary windings are arranged so as to fill the corners, and are formed so that the main windings and the auxiliary windings do not intersect.

In addition, in order to achieve the above object, the method for manufacturing a stator for an induction motor according to the present invention includes coating the upper and lower end surfaces of the stator core and the inner peripheral surfaces of the slots with a thin insulator. to the stator core coated with.

First, the small coil of the main winding is wound around the straight teeth of the iron core, and then the large coil of the main winding is wound on top of the small coil of the main winding in the same direction. First, a small coil is wound in the opposite direction to the main winding for the main winding of the pole that is paired with the main winding that is adjacent to the main winding at right angles to the bent tooth part. Wind the large coil in the same direction over the main winding, repeat this operation to wind all the main windings, and do the same for the auxiliary winding. is wound around the straight teeth of the iron core, and then the large coil of the auxiliary winding is wound in the same direction over the small coil of the auxiliary winding around the bent teeth of the iron core. Then, about the auxiliary winding of the pole that is paired with the auxiliary winding adjacent to it at right angles.

First wind a small coil in the opposite direction to the auxiliary winding, then wind a large coil on top of it in the same direction, repeat this operation to wind all the auxiliary windings, and then wind the ends of these windings. The stator is manufactured by connecting it to the leader wire.

[Function] According to the above technical means, the main winding and the auxiliary winding are
Since the wire is wound directly around the core through a thin insulator, the length of the end coil portion of the winding can be made small.

In addition, in the plan view of the upper and lower end coil parts of the core, the main winding and the auxiliary winding are formed in a straight line, and are not formed in a circumferential shape along the inner periphery of the core as in the conventional technology. Therefore, the communication distance between each slot of the winding of the end coil portion is minimized.

Therefore, the copper loss generated from the end coil portion can be minimized, and in terms of cost, the consumption amount of the @ gland can be minimized, making it possible to obtain an extremely highly efficient and inexpensive stator for an induction motor.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

First, the stator of the four-pole induction motor of this embodiment will be explained with reference to FIGS. 1 to 4.

FIG. 1 is a plan view of a stator of a four-pole induction motor according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view taken along the line A-A in FIG. 1, and FIG. FIG. 4 is a plan view of the iron core of the stator.

In FIGS. 1 to 3, reference numeral 1 denotes a stator core (hereinafter simply referred to as core) formed by laminating thin magnetic iron plates. 2 shown in FIG. 3 is a coil end, and when this is seen in a plan view, as shown in FIG. 1, the main winding 3,
3' is formed so that it is almost in the shape of the character "mouth", and auxiliary windings 4, 4' are shaped so as to fill the corners of the character "mouth" inside the main windings 3, 3'. and the main winding 3゜3
' and the auxiliary windings 4, 4' are formed so as not to intersect with each other.

The main windings 3 and 3' and the auxiliary windings 4 and 4' are configured to be adjacent to each other at right angles, and when 3 and 4 are N poles, 3
They are wound around opposite poles so that ' and 4' serve as south poles.

5 is a lead wire, one end of which is held between locking tools 6. As shown in FIG. 2, the locking tool 6 is formed into an L-shape, the lead wire 5 is inserted between the bent portions, and the end portion is screwed to the end surface of the iron core 1 with screws 7. .

In Fig. 1, the main windings with the same polarity 3 and 3 and 3' and 3' are formed so as to face each other in parallel with each other, and the auxiliary windings also have the same polarity. 4 and 4 and 4' and 4' are formed so as to face each other substantially parallel to each other.

FIG. 4 shows a plan view of the iron core 1, in which 8 is a tooth and 9 is a slot. Reference numeral 10 denotes an insulator, which is thinly coated on the upper and lower end surfaces of the iron core 1 and the inner peripheral surface of the slot 9.

The shape of the teeth 8 of the iron core 1 is designed as follows.

That is, the teeth 8a and 8b for winding the small coils of the main windings 3 and 3' and the auxiliary windings 4 and 4' are formed in a shape that extends straight toward the center of the iron core, and Teeth 8c for winding the large coil with the winding.

8d is approximately parallel to the teeth 8a around which the small coils of the main windings are wound in the portion where the main windings 3, 3' are to be wound, and where the large coils of the auxiliary windings 4, 4' are to be wound. The iron cores 8c and 8d as a whole are formed into a bent shape that is almost in the shape of a "<" or an inside-out "<" shape, with parts of the iron cores 8c and 8d extending toward the center of the core.

Next, the method for manufacturing the stator of the induction motor according to the present embodiment will be explained in the fifth section.
This will be explained with reference to FIGS. 8 through 8.

FIG. 5(a) is a plan view showing the winding method of the small coil of the main winding, FIG. 5(b) is a sectional view taken along the line B-B in FIG. 5(a), and FIG. a) is a plan view showing the winding method of the main winding;
6(b) is a sectional view taken along the line C-C in FIG. 6(a), FIG. 7(a) is a plan view showing the method of winding the small coil of the auxiliary winding, b) is a sectional view taken along line D-D in FIG. 7(a), and FIG. 8(a) is a plan view showing the method of winding the auxiliary winding.

FIG. 8(b) is a sectional view taken along the line EE in FIG. 8(a). In each of these figures, descriptions of the thin insulators coated on the upper and lower end surfaces of the iron core 1 and the inner periphery of the slots are omitted to make the figures complicated.

First, as shown in FIGS. 5(a) and (b), the small coil 3a of the main winding 3 is wound around the teeth 8a of the iron core 1, and then as shown in FIGS. 6(a) and (b), Then, in the same direction, the large coil 3b is wound around the teeth 8c and 8d, overlapping the small coil 3a, and then the main winding 3 adjacent to this is wound.
Regarding the main winding 3' of the opposite pole, first wind the small coil 3a' around the tooth 8a in the opposite direction to the main winding, and then wrap the large coil 3b' around the teeth 8c and 8d. This operation is repeated to wind all the main windings 3, 3'.

Thereafter, as shown in FIGS. 7(a) and (b), the small coil 4a of the auxiliary winding 4 is wound around the teeth 8a of the iron core 1, and then as shown in FIGS. 8(a) and (b). Then, in the same direction, wind the large coil 4b around the teeth 8c and 8d in an overlapping manner above the small coil 4a, and then wind the large coil 4b around the teeth 8c and 8d, and then wind the large coil 4b adjacent to the small coil 4a at right angles, which will be paired with the auxiliary winding 4. Regarding the auxiliary winding 4', first wind the small coil 4a' around the tooth 8b in the opposite direction to the auxiliary winding, and then wind the small coil 4b' around the teeth 8c and 8d in a superimposed manner. Repeat to wind all the main windings 4, 4'.

In the main winding and auxiliary winding wound in this way, the small coil and large coil and the north and south poles are connected one after another, so
By connecting the winding ends at the beginning and end of winding to the lead wire 5, a predetermined electrical connection can be completed, making electrical work easy.

Further, by varnishing the upper and lower end coils 2 of the iron core 1 and fixing the windings, the features of the stator of this embodiment can be further exhibited.

That is, the structure of the stator of this embodiment is such that the end coil 2
Since the height of the end coil is small and the winding is directly wound around the iron core 1, the end coil 2 does not move easily and does not loosen easily, so there is no need to tie the end coil with thread. By doing this, even if there are some disordered lines, they will be fixed by the varnish, making it possible to manufacture a stator that does not require any binding threads.

Another manufacturing method is to form the enamelled wire constituting the winding wire with self-fusing wire, and then after the winding is completed.

As an alternative to the varnish treatment, a method of self-fusing the enamelled wires to each other and fixing the windings by heat treatment can also be employed.

This effect is also the same as that of the varnish treatment described above. According to this embodiment, the dimensions of the end coils above and below the core can be minimized, so copper loss generated from the end coils is reduced. , high efficiency dielectric conduction! 11] n stators can be obtained.

The degree of the effect differs depending on whether the stator has a large or small laminated thickness, but it is possible to improve efficiency by approximately 3 to 5%, and at the same time, the consumption of electric wires can be reduced by the same proportion. . If the stacking thickness of the stator is small and the ratio of end coils is large, it is possible to further improve the efficiency and reduce the consumption of electric wires.

Main windings 3, 3' and auxiliary windings 4, 4' mentioned in the above explanation
The effect is exactly the same even if the stator is wound in such a way that the ``main winding'' is the auxiliary winding, and the ``auxiliary winding'' is the main winding. It is.

[Effects of the Invention] As described above, according to the present invention, the height of one winding is reduced, the dimensions of the end coil are reduced, and the copper loss generated from the end coil is reduced, resulting in high efficiency and low cost. A stator for an induction motor and a method for manufacturing the same can be provided.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a stator of a four-pole induction motor according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line A-A in FIG.
FIG. 3 is an elevational view of the stator, FIG. 4 is a plan view of the iron core of the stator, and FIG. 5(a) is a plan view showing the method of winding the small coils of the main winding. Figure 5(b) is B of Figure 5(a).
- A sectional view taken along the arrow B, FIG. 6(a) is a plan view showing the winding method of the main winding, FIG. 6(b) is a sectional view taken along the line C-C of FIG. 6(a), FIG. 7(a) is a plan view showing the method of winding the small coil of the auxiliary winding, and FIG. 7(b) is the D of FIG. 7(a).
-D arrow sectional view, FIG. 8(a) is a plan view showing the winding method of the auxiliary winding, FIG. 8(b) is EE of FIG. 8(a)
9 is a plan view of a stator of a conventional induction motor, and FIG. 10 is a partially exploded view of the stator of FIG. 9 viewed from the inner diameter side. 1... Iron core, 2... End coil, 3, 3'...
Main winding, 3a, 3a'-small coil, 3b, 3b'...
Large coil, 4, 4'...Auxiliary coil, 4a, 4a'...
...Small coil, 4b, 4b'...Large coil, 5...
Lead wire, 6... Locking tool, 8.8a, 8b, 8c, 8
d-teeth, 9...slot, 1o...insulator.

Claims (1)

[Claims] 1. A stator for an induction motor formed by winding a main winding and an auxiliary winding around the teeth of a stator core, the stator around which small coils of the main winding and the auxiliary winding are wound. The teeth of the iron core are shaped so that they extend straight toward the center of the iron core, and the main winding,
The teeth of the stator core around which the large coil of the auxiliary winding is wound are almost parallel to the teeth around which the small coil of the main winding is wound in the part where the large coil of the main winding is to be wound, and The part where a large coil of wire is to be wound is formed into a bent shape extending toward the center of the iron core, and after winding the main winding and auxiliary winding, the N pole of the main winding, the S pole The poles, as well as the N and S poles of the auxiliary winding, face each other in parallel and face each other, and are wound in an approximately square shape when viewed from the upper and lower end coil sides of the stator core. The auxiliary winding is arranged inside the main winding in a shape that fills the corner of the opening, and the main winding and the auxiliary winding are formed so as not to intersect. Stator for induction motors. 2. In the stator of an induction motor, which is formed by winding the main winding and auxiliary windings around the teeth of the stator core, the teeth of the stator core around which the small coils of the main winding and auxiliary winding are wound are The shape extends straight toward the center of the core, and the main winding,
The teeth of the stator core around which the large coil of the auxiliary winding is wound are almost parallel to the teeth around which the small coil of the auxiliary winding is wound in the part where the large coil of the auxiliary winding is to be wound, and The part where a large coil of wire is to be wound is formed into a bent shape extending toward the center of the iron core, and after winding the auxiliary winding and the main winding, the N pole and S poles of the auxiliary winding are The poles, as well as the N and S poles of the main winding, face each other in parallel to each other, and are wound in an approximately square shape when viewed from the upper and lower end coil sides of the stator core. The main winding is arranged inside the auxiliary winding in a shape that fills the corner of the opening, and the auxiliary winding and the main winding are formed so as not to intersect with each other. Stator for induction motors. 3. In either of claims 1 and 2, the lead wire is sandwiched between locking devices, and this locking device is formed to be screwed to the end face of the stator core. stator of an induction motor. 4. Cover the upper and lower end surfaces of the stator core and the inner circumferential surface of the slots with a thin insulator, and first extend the small coil of the main winding straight onto the stator core coated with this insulator. Then, in the same direction as above, wrap the large coil of the main winding on top of the small coil of the main winding, and then wind the large coil of the main winding around the bent teeth of the iron core, and then wind the large coil of the main winding over the small coil of the main winding in the same direction. For the main winding of the pole that is paired with the main winding adjacent to the main winding, first wind a small coil in the opposite direction to the main winding, and then wind a large coil in the same direction overlapping this, and perform this operation. Repeat this to wind all the main windings, and in the same way for the auxiliary windings, wind the small coil around the straight teeth of the stator core located between the pair of main windings. Then, in the same direction, the large coil of the auxiliary winding is wound over the bent tooth part of the iron core, overlapping the small coil of the auxiliary winding, and then the auxiliary winding adjacent to the small coil at right angles thereto is wound. Regarding the auxiliary winding of the pole that will be paired with the auxiliary winding, first wind a small coil in the opposite direction to the auxiliary winding, then wind a large coil in the same direction overlapping this, and repeat this operation to wind the auxiliary winding. A method for manufacturing a stator for an induction motor, characterized in that the stator is manufactured by winding all the windings and connecting the terminals of these windings to a leader wire. 5. Cover the upper and lower end surfaces of the stator core and the inner peripheral surface of the slot with a thin insulator, and first extend a small coil of the auxiliary winding straight onto the stator core coated with this insulator. Then, in the same direction as above, wrap the large coil of the auxiliary winding on top of the small coil of the auxiliary winding, and then wind the large coil of the auxiliary winding around the bent tooth of the iron core, and then wind the large coil of the auxiliary winding over the small coil of the auxiliary winding in the same direction. For the auxiliary winding of the pole that is paired with the auxiliary winding adjacent to the auxiliary winding, first wind a small coil in the opposite direction to the auxiliary winding, then wind a large coil in the same direction overlapping this, and perform this operation. Repeat this to wind all of the auxiliary windings, and in the same way for the main winding, wind the small coil around the straight teeth of the stator core located between the pair of auxiliary windings. Then, in the same direction, the large coil of the main winding is wound over the bent tooth part of the iron core, overlapping the small coil of the main winding, and then the main winding adjacent to the small coil at right angles thereto is wound. For the main winding of the pole that will be paired with the main winding, first wind the small coil in the opposite direction to the main winding, then wrap the large coil over this in the same direction, and repeat this operation to wind the main winding. A method for manufacturing a stator for an induction motor, characterized in that the stator is manufactured by winding all the windings and connecting the terminals of these windings to a leader wire. 6. Fixing of an induction motor according to any of the methods described in claims 4 and 5, characterized in that the upper and lower end coils of the stator core are treated with varnish to fix the windings. Method of producing children. 7. In any of the methods described in claims 4 and 5, the enameled wire constituting the winding is formed of a self-fusing wire, and after the winding is wound, heat treatment is performed to enamell the wire. A method for manufacturing a stator for an induction motor, characterized in that the windings are fixed by self-fusion of the wires.