JPH0984287A - Stator for motor and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a stator for a motor in which the space factor of the exciting winding (density of winding) can be enhanced, and a manufacturing method thereof. SOLUTION: The stator 4 of a motor 2 comprises a stator core 10 arranged with eight pole teeth 8 with a constant interval on the inner circumferential surface thereof, and an exciting coil 12 fitted to each pole tooth 8. The exciting coil 12a, 12c, 12e, 12g fitted to every other pole tooth 8 has substantially sectoral cross-section in the direction perpendicular to the axial direction of the stator core 10 where the dimension of the pole tooth 8 is larger on the forward end side than on the inner circumferential side of the stator core 10. Other exciting coils 12b, 12d, 12f, 12h have substantially square cross-sections. The stator 4 is assembled by fitting the exciting coils 12a, 12c, 12e, 12g at first and then fitting other exciting coils 12b, 12d, 12f, 12h thus reducing the space between the exciting coils 12 extremely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator of an electric motor used in various industrial equipment.

[0002]

2. Description of the Related Art Conventionally, in a stepping motor, for example, as shown in FIG. 3 (A), a cylinder provided with a plurality of pole teeth H, which serve as magnetic poles in the circumferential direction of the inner peripheral surface, protruding at equal intervals. -Shaped stator core (stator core) SC and exciting windings (exciting coils) wound around the respective pole teeth H thereof
A stator (stator) S is composed of CL and
A rotor (not shown) is rotatably disposed inside the stator S. In addition, FIG.
Shows a plan sectional view of the stator S.

Here, in the conventional stepping motor, when the stator S is manufactured, as shown by the dotted line in FIG. 3A, the same ring-shaped excitation winding can be fitted to each pole tooth H, respectively. The wire CL is preformed separately from the stator core SC, and the exciting winding CL is fitted into each pole tooth H as shown by the arrow in FIG. 3 (A). There is. There is also a method of forming the exciting winding CL by directly winding an enamel wire (copper wire coated with enamel) or the like around the pole tooth H, but in this method, the dimension between the pole teeth H is not relatively large. Cannot be used with.

[0004]

However, in the above-mentioned conventional motor, as indicated by the hatched portion K in FIG.
The space between the exciting windings CL fitted to the adjacent pole teeth H becomes large, and the winding density of the exciting windings CL (that is, the space factor of the exciting windings CL) cannot be improved. . In particular, in order to increase the output (torque) of the motor, it is necessary to increase the space factor of the excitation winding CL, but the conventional motor described above could not obtain a high output.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a stator of an electric motor capable of improving the space factor of the excitation winding, and a manufacturing method thereof.

[0006]

Means for Solving the Problems and Effects of the Invention The present invention as set forth in claim 1 made in order to achieve the above-mentioned object, is formed in a cylindrical shape, and its inner peripheral surface is formed in a circumferential direction. In a stator of an electric motor, comprising a stator core in which a plurality of pole teeth serving as magnetic poles are provided so as to project at equal intervals, and an excitation winding wound around each of the pole teeth, The exciting windings wound around every other one of the pole teeth have a cross-sectional shape in a direction orthogonal to the axial direction of the stator core inside the stator core more than the dimension on the tip side of the pole teeth. The excitation windings are formed in a substantially fan shape having a larger dimension on the circumferential surface side, and the excitation windings other than the excitation windings having the substantially fan-shaped cross section among the excitation windings are the excitation windings having the substantially fan-shaped cross section. Pre-formed into a ring shape that can be fitted onto other pole teeth while already wound around every other pole tooth. Are possible, the gist of the stator of the motor, wherein it is.

In the stator of the electric motor according to claim 1 configured as described above, among the plurality of pole teeth provided on the inner peripheral surface of the stator core, every other pole tooth is The cross-sectional shape of the stator core in the direction orthogonal to the axial direction is substantially fan-shaped, with the dimension on the inner peripheral surface side of the stator core being larger than the dimension on the tip side of the pole teeth. There is.

Then, the other pole teeth, that is, the pole teeth other than the pole teeth on which the excitation winding having the substantially fan-shaped cross section is wound, are the pole teeth having every other excitation winding having the substantially fan-shaped cross section. Ring-shaped excitation windings, which have been already wound and can be fitted to the other pole teeth, are fitted to the respective pole teeth.

That is, in the stator of the electric motor according to the first aspect of the present invention, first, every other pole tooth is wound with an excitation winding having a substantially fan-shaped cross section, and then the other pole tooth is preliminarily formed into a ring shape. It is completed by fitting the shaped excitation winding. According to such a stator of the electric motor according to claim 1, the space between the exciting windings as shown by the hatched portion K in FIG. 3B is occupied by the exciting windings having a substantially fan-shaped cross section. Therefore, the space factor of the excitation winding can be increased.
And thereby, the output of the electric motor using the said stator can be enlarged.

Moreover, the cross-sectional shape of the excitation winding to be wound around every other pole tooth is larger on the inner peripheral surface side of the stator core than on the tip side of the pole tooth. Since it is substantially fan-shaped, when the exciting winding is fitted to the remaining pole teeth, the previously wound exciting winding having a substantially fan-shaped cross section does not interfere.

Therefore, according to the stator of the electric motor described in claim 1, a stator having an extremely large space factor of the excitation winding can be easily manufactured. As for the excitation windings other than the above-described excitation winding having the substantially fan-shaped cross section, the cross-sectional shape in the direction orthogonal to the axial direction of the stator core has a dimension on the tip side of the pole teeth and an inner peripheral surface side of the stator core. It is possible to use a rectangular shape having substantially the same size. When the size of the excitation winding having a substantially fan-shaped cross section on the inner peripheral surface side of the stator core is large, the excitation winding other than the above-described excitation winding having a substantially fan-shaped cross section has a cross-sectional shape of the tip of the pole tooth. It is possible to use an inverted fan shape in which the inner peripheral surface side of the stator core has a smaller dimension than the side dimension.

Next, the present invention according to claim 2 is the stator of the electric motor according to claim 1, wherein the excitation winding having a substantially fan-shaped cross section is preliminarily formed in a ring shape that can be fitted to the pole teeth. It is characterized by being formed.

According to the present invention described in claim 2, it is possible to more easily manufacture the stator of the electric motor in which the space factor of the excitation winding is extremely large. That is, in the stator according to claim 1, the excitation winding having a substantially fan-shaped cross section which is wound around every other pole tooth is formed by directly winding an electric wire such as an enamel wire around the pole tooth. However, as described in claim 2, if it is formed in advance into a ring shape that can be fitted to the pole teeth, even if the stator core has a small gap between the pole teeth, The excitation winding can be easily provided.

In the stator of the electric motor according to the first or second aspect, the excitation winding, which is preliminarily formed in a ring shape, may be formed only by an electric wire such as an enamel wire. The excitation winding may be formed by winding an electric wire around a coil spool formed in a predetermined shape by an insulating material such as resin. Then, in this case, the excitation winding having a desired shape can be easily formed, and further, the stator can be made more easily.

On the other hand, according to a third aspect of the present invention, a stator is formed in a cylindrical shape, and a plurality of pole teeth, which are magnetic poles, are provided at equal intervals in a circumferential direction of an inner peripheral surface of the stator. A manufacturing method for manufacturing a stator of an electric motor, comprising: a core; and an excitation winding wound around each of the pole teeth. Winding an exciting winding whose cross-sectional shape in a direction orthogonal to the axial direction of the stator core is substantially fan-shaped, in which the dimension on the inner peripheral surface side of the stator core is larger than the dimension on the tip side of the pole teeth. Excitation winding having a substantially fan-shaped cross section, and then pre-formed into a ring shape that can be fitted to the other pole teeth while being wound around the alternate pole teeth. Is fitted to the remaining pole teeth of the pole teeth, respectively. .

According to the manufacturing method of the third aspect, the stator of the electric motor of the first aspect can be obtained, and as a result, the space factor of the excitation winding in the stator is increased. It is possible to obtain a large and higher output electric motor.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments to which the present invention is applied will be described below with reference to the drawings. Needless to say, the embodiment of the present invention is not limited to the following examples, and various forms can be adopted as long as they are within the technical scope of the present invention.

First, FIG. 1A is a plan sectional view of a stepping motor 2 of the embodiment. As shown in FIG. 1 (A), the stepping motor 2 is composed of a cylindrical stator 4 and a rotor 6 rotatably arranged in the stator 4. The stator 4 is formed into a cylindrical shape by a laminated iron core, and a plurality of (eight in this embodiment) pole teeth 8 (8a to 8h) are provided at equal intervals in the circumferential direction of the inner peripheral surface thereof. And the exciting coil 12 wound around each of the pole teeth 8a to 8h of the stator core 10.
(12a to 12h), and each pole tooth 8 around which the exciting coil 12 is wound forms a four-phase, eight-pole magnetic pole. In addition, in FIG. 1, a large number of members indicated by “◯” are the enameled wires D forming the exciting coil 12, and in FIG.
Only e and 12f are shown.

On the other hand, the rotor 6 is composed of a laminated iron core having six equally spaced tooth portions 14 on its outer peripheral portion, and a shaft portion 16 at the center thereof is a bearing (not shown) on a side portion of the stator 4. It is rotatably supported via. That is, in the stepping motor 2 of the present embodiment, the pitch of the pole teeth 8 on the stator 4 side and the pitch of the tooth portions 14 on the rotor 6 side are deviated by 15 °, and a rotating magnetic field is generated in the pole teeth 8. Each excitation coil 1
It has a so-called variable reluctance type (VR type) configuration in which the rotor 6 is rotated by the electromagnetic attraction force from the pole teeth 8 when the energization state to 2 is switched.

Here, the pole teeth 8a to 8h of the stator core 10
Of these, every other pole tooth 8a, 8c, 8e, 8g is wound around an exciting coil 12a, 12c, 12e, 12g, respectively.
Has a substantially fan-shaped cross-sectional shape in a direction orthogonal to the axial direction of the stator core 10, in which the dimension on the inner peripheral surface side of the stator core 10 is larger than the dimension on the tip side of the pole teeth 8. .

The exciting coils 12a, 12c, 12e,
As shown in FIG. 1 (B), 12g is formed separately from the stator core 10 by winding the enamel wire D around the ring-shaped coil spool 18 having the above-mentioned cross-sectional shape. And each exciting coil 12a, 12c, 1
2e and 12g are respectively wound around the pole teeth 8a, 8c, 8e and 8g by fitting the hollow portion 18a of the coil spool 18 into the corresponding pole teeth 8a, 8c, 8e and 8g.

Further, of the pole teeth 8a to 8h of the stator core 10, the exciting coils 12b, 12d, 12f and 12h respectively wound around the remaining pole teeth 8b, 8d, 8f and 8h are the stator core 10 and The cross-sectional shape in the direction orthogonal to the axial direction is formed in a substantially square shape in which the dimension of the pole teeth 8 on the tip side and the dimension of the stator core 10 on the inner peripheral surface side are equal.

The exciting coils 12b, 12d, 12f,
As shown in FIG. 1C, 12h is also formed separately from the stator core 10 by winding the enamel wire D around the ring-shaped coil spool 20 having the above-described cross-sectional shape. And each exciting coil 12b, 12d, 1
2f and 12h are also wound around the respective pole teeth 8b, 8d, 8f and 8h by fitting the hollow portion 20a of the coil spool 20 into the corresponding pole teeth 8b, 8d, 8f and 8h, respectively. There is.

The stator 4 provided with the exciting coils 12a to 12h as described above firstly has pole teeth 8a to 8a of the stator core 10.
Out of 8h, alternate pole teeth 8a, 8c, 8e, 8g
The exciting coils 12a, 12c, 12e, which have a substantially fan-shaped cross section,
12g respectively, and then the remaining pole teeth 8b, 8d,
Excitation coils 12b, 12d, 12f, 1 on 8f, 8h
It is assembled by the procedure of fitting each 2h.

Although not shown in FIG. 1, each pole tooth 8
As shown in FIG. 2, notches 22 are formed on the left and right sides in the vicinity of the tip of each of the pole teeth 8 adjacent to each other.
A retaining member 24 formed in a plate shape with an insulating material such as a resin is attached between them. That is, as described above, after the exciting coils 12 are fitted to the pole teeth 8 of the stator core 10 respectively, the retaining member 24 is removed as shown in FIG.
By attaching as described above, it is possible to prevent the exciting coil 12 from coming off from the pole tooth 8, and thus the stator 4 is completed.

In the stepping motor 2 of the present embodiment constructed as described above, every other pole tooth 8a, 8c, 8e, 8g of the stator core 10 is provided with exciting coils 12a, 12c, having a substantially fan-shaped cross section. After fitting 12e and 12g, the stator 4 is assembled by fitting the exciting coils 12b, 12d, 12f and 12h having a substantially square cross section to the other pole teeth 8b, 8d, 8f and 8h. There is.

Therefore, according to the stator 4 of this embodiment, the space shown by the hatched portion K in FIG. 3B is occupied by the exciting coils 12a, 12c, 12e, 12g having a substantially fan-shaped cross section. This means that the space factor of the exciting coil 12 can be increased. Thus, the output of the stepping motor 2 using the stator 4 can be increased.

In the above embodiment, the exciting coils 12b, 12d, 12f, 12h to be fitted later have a substantially square cross section, but the exciting coil 12 to be fitted first is used.
When the dimensions of the inner peripheral surface side of the stator core 10 of a, 12c, 12e, 12g are large, the exciting coils 12b, 12
As d, 12f, and 12h, it is also possible to use an inverted fan-shaped one whose cross-sectional shape has a smaller dimension on the inner peripheral surface side of the stator core 10 than on the tip side of the pole teeth 8.

Further, in the above embodiment, the exciting coil 12
Although a, 12c, 12e, and 12g are formed so that they can be fitted to the pole teeth 8, if there is a margin between the pole teeth 8,
The excitation coils 12a, 12c, 12e, 12g are the pole teeth 8
It may be formed by directly winding the enamel wire D on each of a, 8c, 8e and 8g.

Furthermore, in the above embodiment, the exciting coils 12a to 12h are formed by winding the enameled wire D around the coil spools 18 and 20, but the exciting coil 12 is also formed.
a to 12h, without using the coil spool 18, 20,
Alternatively, the enamel wire D alone may be formed into a ring shape.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating a stepping motor according to an embodiment.

2 is an explanatory view illustrating a retaining member provided on the stator core of FIG. 1. FIG.

FIG. 3 is a plan sectional view illustrating a stator of a conventional motor.

[Explanation of symbols]

2 ... Stepping motor 4 ... Stator 6 ... Rotor 8 (8a-8h) ... Pole teeth 10 ... Stator core 12 (12a-12h) ... Excitation coil 14 ... Tooth portion
16 ... Shaft part 18, 20 ... Coil spool 18a, 20a ... Hollow part 22 ... Notch 24 ... Fall prevention member D ... Enamel wire

Claims (3)

[Claims] 1. A stator core, which is formed in a cylindrical shape and has a plurality of pole teeth, which are magnetic poles and which protrude in a circumferential direction of an inner peripheral surface thereof, at equal intervals, and around each of the pole teeth. In a stator of an electric motor comprising: an exciting winding wound around each of the windings; an exciting winding wound around every other pole tooth of the pole teeth is orthogonal to an axial direction of the stator core. The cross-sectional shape in the direction is formed in a substantially fan shape in which the dimension on the inner peripheral surface side of the stator core is larger than the dimension on the tip side of the pole teeth, and the cross-sectional shape of the excitation winding is substantially the same. Excitation windings other than fan-shaped excitation windings are pre-formed into ring shapes that can be fitted to other pole teeth with the excitation windings having the substantially fan-shaped cross section already wound around the other pole teeth. The stator of the electric motor, which is characterized by being 2. The stator of the electric motor according to claim 1, wherein the excitation winding having a substantially fan-shaped cross section is preliminarily formed in a ring shape that can be fitted to the pole teeth. The stator of the electric motor. 3. A stator core, which is formed in a cylindrical shape and has a plurality of pole teeth, which serve as magnetic poles and which protrudes at equal intervals in a circumferential direction of an inner peripheral surface thereof, and around each of the pole teeth. A manufacturing method for manufacturing a stator of an electric motor comprising: an excitation winding wound around each of the windings; and an alternating pole tooth of every other one of the pole teeth orthogonal to an axial direction of the stator core. A cross-sectional shape in the direction is a substantially fan-shaped excitation winding whose dimension on the inner peripheral surface side of the stator core is larger than that on the tip side of the pole teeth. Exciting windings, which are pre-formed in a ring shape that can be fitted to other pole teeth while the exciting windings are already wound around the alternate pole teeth, are A method for manufacturing a stator of an electric motor, characterized in that each of the pole teeth is fitted.