JP2000184638A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor whose reliability and durability are superior. SOLUTION: A rotor comprises a shaft as an output shaft, permanent magnets 13 and a laminated core 11 comprising a first hole 12a into which the shaft is inserted and comprising second holes 14c into which the permanent magnets 13 are inserted. This motor is provided with the rotor. In addition, it is provided with a stator which is arranged at the outside of the rotor. Third holes 14b are formed near the second holes 14c in the laminated core 11. Pins 12b which are formed integrally with end plates are force-fitted to the third holes 14b. Caulking parts 14d which are sandwiched between the second holes 14c and the third holes 14b in the laminated core 11 are plastically deformed (caulked) so as to be compressively welded to the permanent magnets 13. The permanent magnets 13 are fixed to the laminated core 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and more particularly to a rotor structure of an inner rotor type motor.

[0002]

2. Description of the Related Art An inner rotor type motor is generally used in which a rotor having a permanent magnet is disposed inside a stator having a winding coil mounted on a stator core. The stator disposed outside the rotor is configured by integrally providing a plurality of salient poles projecting radially inward from a yoke portion formed in an annular (cylindrical) shape, and a coil wire is directly wound around the salient poles. The winding coil is formed by turning, or a winding coil wound in advance is mounted on the salient pole. The rotor is constructed by integrally attaching a rotor core having a plurality of permanent magnets fixed to a rotating shaft as an output shaft, and is inserted and arranged inside the stator. The rotor is rotated by electromagnetic force by appropriately energizing the winding coils provided on each salient pole.

The structure of a conventional rotor employed in such a motor will be described with reference to FIGS. The rotor 31 includes a rotor core and a shaft 32 as an output shaft. As for the rotor core, the laminated core 33 is formed by a pair of end plates (end plates or holding plates).
34, and is integrally fixed by a plurality of rivets 35.

The laminated core 33 is formed by punching out a magnetic sheet metal by a press or the like to form a through hole 36a formed in the center of the disk and a plurality of through holes for rivets formed outside the through hole 36a. The hole 36b and the through hole 3
6b through holes 3 for a plurality of magnets formed further outside
6c is constituted by laminating a plurality of core plates 36.

[0005] The through hole 36c for the magnet of the core plate 36
As shown in FIGS. 8A and 8B,
Plural projections 3 protruding toward the inside of through hole 36c
6d are formed. The dimension between the tip of the protrusion 36d and the opposite side of the through hole 36c is set smaller than the plate thickness of the permanent magnet 37.

The end plate 34 has a through hole 34a formed in the center of the disk, and a plurality of rivet through holes 34b formed outside the through hole 34a.
The through holes 36a and 36b of the core plate 36 and the through holes 34a and 34b of the end plate 34 are formed at positions corresponding to each other with substantially the same diameter.

The permanent magnet 37 is provided in the through hole 3 of the laminated core 33.
6c. At this time, the permanent magnet 37 is fixed to the laminated core 33 by being pressed by the protrusion 36d formed in the through hole 36c. In the rotor core, after the permanent magnets 37 are respectively inserted and fixed in the through holes 36c of the laminated core 33, the laminated core 33 is sandwiched between the pair of end plates 34, and in this state, the through holes 34b,
The rivet 35 is inserted into each of the rivets 36b, and the protruding tip of the rivet 35 is caulked to be integrally fixed.

The shaft 32 has a large diameter portion 32 at an intermediate portion thereof.
a is inserted into the through-holes 34a and 36a at the center of the rotor core and integrally attached, whereby the rotor 31
Is configured.

[0009]

However, according to the prior art, the permanent magnet is pressed into the through hole for the magnet formed in the laminated core and pressed by the projection formed in the through hole. Is fixed to the laminated core. At this time, since the permanent magnet enters the through hole while rubbing with the protrusion, a portion of the protrusion or the permanent magnet is shaved by the rubbing, and shavings (cut pieces) are generated. Since the shavings have magnetism and are attracted to the permanent magnet, they cannot be easily removed, and the remaining shavings may fly out with the operation of the motor to cause a failure of the motor. There was a problem. Further, the permanent magnet was sometimes damaged by the projection. For this reason, there were cases where a motor having excellent reliability and durability could not be manufactured.

Further, according to the prior art, since the laminated core and the end plate are integrally fixed by a plurality of rivets, there is a problem that the number of parts is large and the number of working steps for assembling and manufacturing is large. Was.

The present invention has been made in view of such problems of the prior art, and has as its object to provide a motor having excellent reliability and durability. It is another object of the present invention to provide a motor that requires less man-hours for assembly and manufacturing.

[0012]

[Means for Solving the Problems] In order to achieve the above object, a motor according to claim 1 includes a laminated core having a shaft as an output shaft, a magnet, a first hole into which the shaft is inserted, and a second hole into which the magnet is inserted. And a stator disposed outside of the rotor, the motor including a third hole near the second hole of the laminated core.
Wherein the portion of the laminated core sandwiched between the second hole and the third hole is plastically deformed so as to be pressed against the magnet inserted into the second hole. I do.

According to the first aspect of the present invention, the magnet is inserted into the second hole of the laminated core.
The portion sandwiched by the holes (hereinafter, also referred to as a caulked portion) is plastically deformed (caulked) so as to press the magnet, so that the magnet is fixed to the laminated core. Since projections and the like do not contact or press against the magnet, no shavings or chips are generated due to a part of the magnet or the laminated core being scraped when the magnet is inserted. Further, since the swaging portion sandwiched between the second hole and the third hole is merely swaged, the work is easy and the magnet can be securely fixed without being damaged.

2. Although not particularly limited in the above invention, as in the motor according to claim 2, the portion of the laminated core sandwiched between the second hole and the third hole is the third core.
By pressing a pin into the hole, plastic deformation can be achieved. In this way, the caulking operation of the caulking portion becomes extremely easy, and the number of working steps can be reduced.

3. Although not particularly limited in the above invention, as in the motor according to claim 3, the laminated core is formed by a pair of end plates integrally having the pins at positions corresponding to the third holes of the laminated core. Can be pinched.

In the motor according to the third aspect of the present invention, the pin for caulking the caulked portion of the laminated core is provided integrally with the end plate for holding the laminated core. The work of clamping and fixing the core by the end plate is performed at the same time, and the working efficiency can be increased. Since the end plate is integrated with the laminated core via the pins, rivets are not required unlike the related art, the number of components is small, and the configuration is simplified.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a main part of a motor according to an embodiment of the present invention, FIG. 2 is a perspective view of a rotor according to the embodiment, FIG. 3 is an exploded perspective view of the rotor, and FIG. FIG. 5 is a plan view of the laminated core, FIG. 5 is a longitudinal sectional view of the rotor core according to the embodiment, and FIG. 6 is a transverse sectional view of the rotor core.

First, an overall schematic configuration of the motor according to the present embodiment will be described with reference to FIG. The motor 1 of the present embodiment includes a rotor 2 as a rotor, a stator 3 as a stator, and a motor housing (not shown) for accommodating them.

The rotor 2 is constructed by inserting a shaft 5 as an output shaft into a through hole formed at the center of the rotor core 4 and integrally fixing the shaft. The rotor core 4 has a plurality of permanent magnets (FIG. (Not shown). The shaft 5 of the rotor 2 is supported by the motor housing.

The stator 3 includes a substantially cylindrical stator core 6 and a plurality of winding coils 7. The stator core 6 is formed by integrally providing a plurality of salient poles 9 protruding in the radial direction inside a substantially cylindrical yoke portion 8, thereby forming a slot between the salient poles 9. The stator 3 is fixed inside the motor housing.

The rotor 2 is inserted and arranged so as to have a predetermined gap between the rotor 2 and the salient poles 9 of the stator core 6. Winding coils 7 are wound around the salient poles 9 of the stator core 6, respectively, and a current is applied to these winding coils 7 at a predetermined timing to excite the winding coils 7. The rotor 2 rotates.

Next, the structure and manufacturing method of the rotor 2 will be described in detail with reference to FIGS. The rotor 2 is configured such that a shaft 5 as an output shaft is integrally fixed to a rotor core 4. The rotor core 4 is configured by sandwiching the laminated core 11 between a pair of end plates (end plates or holding plates) 12, and a plurality of permanent magnets 13 are mounted inside the laminated core 11 as described later in detail ( Buried).

The laminated core 11 is formed by laminating a plurality of core plates 14 and integrating them. The core plate 14 is a substantially disk-shaped member. The core plate 14 is formed by punching and forming a magnetic sheet metal by a press device or the like, so that a through hole (first hole) 14a is formed in the center of the disk and a through hole (first hole) is formed outside the through hole 14a. A plurality of (four in this embodiment) pin through-holes (third holes) 14b formed in an array and through-holes 14b for the pins
A plurality of (four in this embodiment) magnet through-holes (second holes) 14c formed in an array are further formed on the outside.

The magnet through-hole 14c has a shape substantially corresponding to or slightly larger than the permanent magnet 13 inserted and fixed therein, and in this embodiment is a straight groove. As shown best in FIG. 4, the through hole 14b for a pin has a shape in which a part of a round hole is closed along a string, and the part of the string has a through hole for a magnet. It is formed along the hole 14c.

Although not shown, a single or a plurality of half piercings (embosses) are simultaneously formed on the core plate 14 at the time of press working. The half piercing is composed of a convex portion formed on one surface of the core plate 14 and a concave portion formed at a corresponding position on the other surface, and the convex portion is formed in a shape that can be fitted or pressed into the concave portion. ing. However, the half piercing of the core plate 14 is not always essential. Although the thickness of the core plate 14 is not particularly limited, a thickness of about 0.5 mm is used in this embodiment.

The pair of end plates 12 are substantially disk-shaped members similar to the core plate 14, and are located at positions corresponding to the through holes 14 a at the center of the core plate 14, and have a smaller diameter than the through holes 14 a. An inner ring (cylindrical portion) 12c having an inner ring 12a is integrally provided. The outer diameter of the inner ring 12c is the same as or slightly larger than the through hole 14a so that the inner ring 12c can be pressed into the through hole 14a at the center of the core plate 14.

The end plate 12 has the same diameter or a slightly larger diameter at a position corresponding to the pin through hole 14b of the core plate 14 so as to be press-fittable into the through hole 14b. A plurality of projecting pins 12 having a substantially cylindrical shape
b is formed integrally. The vicinity of the tips of these pins 12b is formed in a tapered shape so that the laminated core 11 can be easily inserted into the through holes 14b for pins. Although the end plate 12 is not particularly limited,
For example, it can be manufactured using brass, and the thickness of the plate is about 1.0 mm in this embodiment.

The shaft 5 has an intermediate portion (rotor core 4).
And a large-diameter portion 5a in the vicinity of the large-diameter portion 5a. The outer diameter of the large-diameter portion 5a The diameter is slightly larger than the hole 12a.

[0029] Such a rotor 2 is as follows.
Assembled and manufactured. First, a plurality of core plates 14 are stacked, and one half piercing of an adjacent core plate 14 is press-fitted into the other half piercing, whereby the stacked cores 11 are integrally formed with each other. This laminated core 11
The permanent magnets 13 formed in a plate shape corresponding to the through holes 14c for the respective magnets are inserted and temporarily fixed.

Next, the inner rings 12c of the pair of end plates 12 are press-fitted into the through holes 14a at the center of the laminated core 11, and the pins 12b of the end plates 12 are inserted through the corresponding pins of the laminated core 11 for the corresponding pins. The rotor core 4 is manufactured by press-fitting into the hole 14 b and integrating the laminated cores 11 with each other while sandwiching the laminated cores 11 between the pair of end plates 12.

At this time, each pin 1 of the end plate 12
2b is pressed into the through hole 14b of the laminated core 11, the chord portion of the through hole 14b is pressed toward the permanent magnet 13 by the pin 12b, and the chord portion of the through hole 14b for the pin and the magnet The caulking portion 14d, which is a portion sandwiched between corresponding portions of the through hole 14c, protrudes into the through hole 14c and is caulked so as to press the permanent magnet 13 (plastically deformed). Thereby, each permanent magnet 13 is integrally fixed to the laminated core 11.

Thereafter, the large-diameter portion 5a of the shaft 5 is press-fitted into the through hole 12a of the inner race 12c of the pair of end plates 12, and the shaft 5 is fixed to the rotor core 4 and integrated, as shown in FIG. Is formed.

According to the above-described embodiment, each pin 12b of the end plate 12 is press-fitted into the through hole 14b of the laminated core 11, whereby the caulking portion 1 is formed by the pin 12b.
4d is caulked, protrudes into the through-hole 14c, and each permanent magnet 13 inserted into the magnet through-hole 14c of the laminated core 11 is pressed by the caulked portion 14d, and the caulked portion 14d and the through-hole 14c The permanent magnet 13 is sandwiched between the surfaces facing each other, and the permanent magnet 13 is integrally fixed to the laminated core 11.

Therefore, unlike the prior art, there is no protrusion projecting into the through hole for the magnet, so that the permanent magnet can be smoothly inserted into the through hole, and the insertion work for that is easy. . In addition, since the permanent magnet does not enter the through hole while rubbing with the projection, a part of the projection or the permanent magnet is scraped by the rubbing, and shavings (cut pieces) are generated. Nothing. Therefore, the shavings and the like are attracted to the permanent magnet, and the remaining shavings and the like do not fly out with the operation of the motor and cause a failure of the motor, and the permanent magnet may be damaged by the protrusion. Absent. Thereby, reliability and durability can be improved.

In this embodiment, the end plate 1
2 is press-fitted into the pin through-hole 14b of the laminated core 11 to form a caulking portion 14d.
The permanent magnet 13 is fixed by caulking, and the caulking work is performed simultaneously with the work for integrating the end plate 12 and the laminated core 11, so that a special work for caulking is performed. It does not need to be performed, and assembling / manufacturing work is easy and the number of working steps is small.

Further, the laminated core 11 in which the permanent magnets 13 are embedded is sandwiched between a pair of end plates 12, and a through hole 14 a at the center of the laminated core 11 and a through hole 14 b for a pin are inserted into the end plate 12. The inner race 12c and the corresponding pin 12b are press-fitted and fixed to form the rotor core 4,
The large-diameter portion 5a of the shaft 5 is press-fitted and fixed in the through hole 12a at the center of the end plate 12, so that the shaft 5 is integrally attached to the rotor core 4. Therefore, since rivets are not used unlike the conventional case, the number of parts can be reduced accordingly.

The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

For example, in the above embodiment, the permanent magnet 1
3 is a plate-like shape, and the through hole 1 for the magnet of the laminated core 11 is formed.
4c also has a linear groove shape to correspond to this, but the shape of the permanent magnet and the shape of the through hole for the magnet of the laminated core may be any shape as long as they substantially correspond to each other. The shape may be an arc plate, a column, a polygon, or any other shape.

The shape of the through hole for the magnet of the laminated core and the shape of the pin press-fitted therein can be any as long as the crimped portion is plastically deformed by press-fitting the pin.
For example, the through hole for the pin may be formed in an oval or elliptical shape so that its longitudinal direction or major axis direction is along the through hole for the magnet, and the shape of the pin may be cylindrical or conical.

Further, in the above embodiment, the through hole for one pin is provided inside the center of the through hole for one magnet, but the through hole for the pin is replaced with the through hole for one magnet. A plurality of magnets may be provided on the outer side of the through hole for one magnet. Further, in the above embodiment, the hole for press-fitting the pin 12b of the laminated core 11 is the through hole 14b extending to both end surfaces of the laminated core 11, but it is not necessarily required to penetrate. It is sufficient if the hole has a depth corresponding to. However, in this case, a plurality of types of core plates constituting the laminated core, that is,
It is necessary to prepare a core plate having the through hole 14b and a core plate having no through hole 14b.

In addition, the motor to which the present invention can be applied is not limited to the motor of the above-described embodiment, and can be applied to a motor having another configuration as long as it is an inner rotor type motor. The number of layers and the thickness of the core plate 14 constituting the laminated core 11 are also arbitrary.

[0042]

As described above, according to the present invention, it is possible to securely and easily fix a magnet to a rotor, and to provide a motor having excellent reliability and durability. In addition, there is an effect that a motor having a small number of work steps for assembly and manufacture is provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a motor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a rotor of the motor according to the embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a rotor of the motor according to the embodiment of the present invention.

FIG. 4 is a plan view showing a laminated core of the motor according to the embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a rotor core of the motor according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a rotor core of the motor according to the embodiment of the present invention.

FIG. 7 is an exploded perspective view showing a rotor of a motor according to the related art.

FIG. 8A is a plan view showing a rotor core of a motor according to the related art, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Motor 2 ... Rotor 3 ... Stator 4 ... Rotor core 5 ... Shaft 6 ... Stator core 7 ... Winding coil 8 ... Yoke part 9 ... Salient pole 11 ... Laminated core 12 ... End plate 12a ... Shaft through hole 12b ... Pin 12c ... Inner ring 13 ... Permanent magnet 14 ... Core plate 14a ... Through hole for shaft (first hole) 14b ... Through hole for pin (third hole) 14c ... Through hole for magnet (second hole) 14d … Caulking part

Claims (3)

[Claims] A shaft (5) as an output shaft, a magnet (1)
3) a rotor (2) including a laminated core (11) having a first hole (14a) into which the shaft is inserted and a second hole (14c) into which the magnet is inserted; A motor (1) having a stator (3) disposed therein, wherein a third hole (14) is provided near the second hole of the laminated core.
b), wherein the portion (14d) of the laminated core sandwiched between the second hole and the third hole is plastically deformed so as to be pressed against the magnet inserted into the second hole. A motor characterized by the following. 2. The second hole (1) in the laminated core (11).
4c) and the portion (14) sandwiched between the third hole (14b).
2. The motor according to claim 1, wherein d) is plastically deformed by press-fitting a pin (12b) into the third hole. 3. The third hole (1) of the laminated core (11).
The motor according to claim 2, wherein the laminated core is sandwiched between a pair of end plates (12) integrally having the pins (12b) at positions corresponding to (4b).