JPS60257750A - Motor - Google Patents

Abstract

PURPOSE:To facilitate securing and positioning of a plurality of permanent magnets by providing the plurality of magnets in a core, and providing projections disposed between the magnets in the core. CONSTITUTION:Projections 53 of a core are formed between adjacent permanent magnets 45 secured to a stator core 43 or a rotor core 46. When the magnets 45 are bonded by a synthetic adhesive to the core 43 or 46, the magnets can be positioned without using a positioning jig by providing the projections 53. Accordingly, the work can be facilitated.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an electric motor used for driving industrial machinery, etc.

Conventional Structures and Problems The development of industrial machinery has been remarkable in recent years, and as a result, high-output electric motors have become popular for driving purposes.

A conventional electric motor will be explained below. FIG. 9 is a longitudinal cross-sectional view showing an example of a conventional electric motor, and FIG. 10 is a cross-sectional view thereof.

In FIGS. 9 and 10, reference numeral 1 denotes a stator core made of laminated steel plates fixed by pins 1o, and a winding 2 is wound around the stator core 1.

A permanent magnet 3 is fixed to a rotor core 4 made of laminated steel plates with a synthetic adhesive or the like. Further, the rotor core 4 is fixed to the rotating shaft 6 to form a rotor 10. Rotor 9
is rotatably supported by a bracket 7 and a cover 8 via a bearing 6. Next, another conventional example will be shown.

FIG. 11 is a vertical cross-sectional view showing another example of a conventional electric motor;
Figure 2 shows a cross-sectional view.

In FIGS. 11 and 12, reference numeral 11 denotes a cylindrical stator core made of a magnetic material such as iron, and a permanent magnet 12 is fixed inside the stator core with a synthetic adhesive or the like. Reference numeral 13 denotes a rotor core made of laminated steel plates, in which a winding 14 is housed, forming a rotor 19. Furthermore, the rotor 19 has a bearing 1
It is rotatably supported by the bracket 1 and the cover 18 via the bracket 1 and the cover 18.

FIG. 9 shows a conventional electric motor configured as follows.

The operation and problems of the electric motor shown in FIG. 10 will be explained below.

Figure 13 shows an enlarged cross-sectional view of the electric motor shown in Figures 9 and 10. 22 is a permanent magnet, 23 is a rotor core, and 24 is a rotating shaft. φ1. φ2 is a magnetic flux generated by a permanent magnet, which passes through magnetic paths indicated by arrows in FIG. 12, respectively. The highest magnetic flux density in the rotor core 23 is the magnetic flux φ1. .

This is the part ■ where the two overlap. In order to prevent the magnetic flux from becoming saturated in the part (2), it is necessary to make the size of the part (2) sufficiently large relative to the magnetic flux, or to use a material with a large maximum magnetic permeability. However, if the dimensions of the rotor core shown in FIG. 13 are increased, the outer diameter of the motor must be increased, resulting in a large motor with respect to its output. Also,
If a material with a large maximum magnetic permeability is used, the material cost will be high, resulting in an expensive electric motor. FIG. 14 shows a cross-sectional view of the rotor.

As shown in FIG. 14, in order to fix the permanent magnet to the rotating f-iron core 29 with a synthetic adhesive or the like, it is necessary to fix the permanent magnet 31 while applying the positioning jig 32 after fixing the permanent magnet 3o. This operation has to be repeated in sequence for the number of permanent magnets, which is disadvantageous in that it is extremely time-consuming and labor-intensive.

Next, regarding the conventional electric motor shown in Figs. 11 and 12,
The operation and problems are explained below. 16th
shows a cross-sectional view of the electric motor shown in FIGS. 11 and 12.

In Fig. 15, 33 is a stator core, 34 is a permanent magnet,
35 is a rotor core, 36 is a winding, 37 is a rotating shaft, φ5.
φ4 is the magnetic flux generated by the permanent magnet, and the first
It passes through the magnetic path shown in Figure 4. The magnetic flux density in the stator core 33 is highest at magnetic flux φ3. This is a cross-section of the ■ part where φ4 overlaps. In order to not saturate the magnetic flux at part 0, either make the size of part I7 sufficiently large relative to the magnetic flux, or
It is necessary to use a material with a large maximum magnetic permeability. However, increasing the size of the part (■) does not require a large motor with a large external size in relation to the output, and the use of materials with a large maximum magnetic permeability increases the material cost, resulting in an expensive motor. .

FIG. 16 shows a cross-sectional view of the stator. As shown in FIG. 16, in order to fix the permanent magnet to the stator core 39 with a synthetic adhesive or the like, after fixing the permanent magnet 4o, use the positioning jig 42.
It is necessary to fix the permanent magnet 41 while applying it. This process has to be repeated in sequence for the number of permanent magnets, which is disadvantageous in that it is extremely time-consuming and labor-intensive.

OBJECTS OF THE INVENTION The present invention takes into account the above-mentioned conventional problems, and aims to provide a small, high-output electric motor that allows easy fixing and positioning of permanent magnets, has good workability, and has a high output.

Structure of the Invention In order to achieve the above-mentioned object, the present invention provides an electric motor characterized in that an iron protrusion is provided between adjacent permanent magnets fixed to a stator core or a rotor core. By providing the convex part of the iron core, when fixing the permanent magnet to the stator iron core or the rotor iron 1b with a synthetic adhesive, the work can be done easily because it can be positioned without using a positioning jig.
It can be done in a short time, and a convex part is created in the part where the magnetic flux density is highest, increasing the cross-sectional area, so fai
Since saturation of the magnetic flux does not occur even if the outer diameter of the stator core or the rotor core is made smaller, the outer diameter of the motor can also be made smaller, making it possible to obtain a small, high-output motor.

Description of examples Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a longitudinal cross-sectional view of the electric motor of this embodiment, and FIG. 2 shows a cross-sectional view.

1 and 2, 43 is a stator core, 44 is a winding, 45 is a permanent magnet, 46 is a rotor core, 47 is a rotating shaft, 48 is a bearing, 49 is a bracket, 5o is a cover, 5
1 indicates a rotor. 9 and 10 except that a convex portion 53 is provided between adjacent permanent magnets fixed to the rotor core 46.
The configuration is similar to the conventional electric motor shown in the figure.

By manufacturing the rotor core by stacking punched steel plates in a shape with a convex portion 53 like the rotor core shown in FIG. 2, the rotor core with magnetic flux φ5° to φ6 as shown in FIG. The cross-sectional area of the 0 section where the magnetic flux density is highest is increased, and the outer diameter of the rotor can be made smaller than that of conventional motors, so the outer diameter of the motor is also reduced, making it possible to obtain a small, high-output motor. Furthermore, as shown in Fig. 4, when fixing permanent magnets to the rotor core with synthetic adhesive, etc., the fixing position can be determined by the protrusion 65 without using a positioning jig as in the past. The work can be done easily and in a short time.

Next, other embodiments of the present invention will be described with reference to the drawings.

FIG. 5 is a vertical sectional view of an electric motor according to another embodiment of the present invention, and FIG.
The figure shows a cross-sectional view.

5 and 6, 68 is a stator core, 69 is a permanent magnet, 7o is a rotor core, 71 is a winding, 72 is a rotating shaft, 73 is a bearing, 74 is a bracket 1-175 is a cover, 7
6 indicates a rotor.

The structure is similar to the conventional electric motor shown in FIGS. 11 and 12, except that a convex portion 77 is provided between adjacent permanent magnets fixed to the stator core O. By shaping the stator core made of a magnetic material such as iron to have a convex portion 77 as shown in FIG. 6, the magnetic flux φ7 as shown in FIG. The cross-sectional area of the 0 section where the magnetic flux density is highest in the φ8 stator core is increased, and the outer diameter of the stator can be made smaller than that of conventional motors, making it possible to obtain a compact high-output motor.

Furthermore, as shown in Fig. 8, when fixing permanent magnets to the stator core with synthetic adhesive, etc., the fixing position is determined by the protrusion 86 instead of using a positioning jig as in the past. can be done easily and in a short time.

Effects of the Invention As is clear from the above description of the embodiments, the present invention relates to an electric motor characterized in that a convex portion of the iron core is provided between adjacent permanent magnets fixed to the stator core or the rotor core. By providing a convex part of the iron core, when fixing the permanent magnet to the stator core or rotor core with synthetic adhesive, etc., the work can be done easily without using a positioning jig. This can be done in a short time, and because a convex portion is formed at the part where the magnetic flux density is highest and the cross-sectional area becomes larger, the magnetic flux can be reduced even if the outer diameter of the stator core or rotor core is made smaller than in conventional electric motors. Since saturation does not occur, the outer diameter of the motor can be made smaller, resulting in a secondary effect of being able to obtain a small, high-output motor.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional view of an embodiment of the present invention, FIGS. 3 and 4 are cross-sectional views of essential parts of an embodiment of the present invention, and FIG. is a longitudinal sectional view of another embodiment of the present invention,
FIG. 6 is a cross-sectional view of another embodiment of the present invention, FIG. 7, and FIG.
The figure is a sectional view of a main part of another embodiment of the present invention. FIG. 9 is a longitudinal cross-sectional view of a conventional electric motor, FIG. 10 is a cross-sectional view of a conventional electric motor, FIG. 11 is a vertical cross-sectional view of another conventional electric motor, and FIG. 12 is a longitudinal cross-sectional view of another conventional electric motor. A cross-sectional view of the electric motor, FIGS. 13 and 14 are cross-sectional views of main parts of a conventional electric motor, and FIG.
This figure and FIG. 16 are sectional views of main parts of another conventional electric motor. 43.54.68.78.85...Fixed iron,
H, 44.65, 71.81...Winding, 45, 6
6. 66, 69, 79, 88...Permanent magnet, 4
6,57゜63.70.80... Rotor core, 4
7, 58. 64.72.82...Rotating shaft, 63, 62, 65°7, 84, 86...Protrusion, φ5. φ6. φ7
．． φ8...Magnetic flux. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure vl Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 9 Figure 8 Figure 9 q Figure 10 Figure 11\ /de Figure 12 Figure 13 Figure 15

Claims (3)

[Claims] (1) An electric motor characterized in that a plurality of permanent magnets are attached to an iron core, and a convex portion located between each of the permanent magnets is provided on the iron core. (2) The electric motor according to claim 1, wherein the iron core provided with the convex portion is a rotor iron core. (3) The electric motor according to claim 1, wherein the iron core provided with the convex portion is a stator iron core.