JP2000184645A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor in which the number of components is small, whose constitution is simple and whose assembly and manufacture is easy. SOLUTION: This motor is provided with a rotor 2 and a stator which is arranged at the outside of the rotor 2. A plurality of discoidal core plates 14 which comprise through holes 14a, 14b, 14c are laminated so as to form a laminated core 11. The laminated core 11 in which permanent magnets 13 are placed on the through holes 14c is sandwiched between, and held by, a pair of discoidal end plates 12 which comprise through holes 12a, pins 12b and inner rings 12c. The pins 12b are force-fitted and fixed to the through holes 14b so as to be integrated, and the inner rings 12c are force-fitted and fixed to the through holes 14a so as to be integrated. A shaft 5 as an output shaft is force-fitted and fixed to the through holes 12a in the end plates 12. As a result, a rotor 2 is constituted.

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 configuration of a conventional rotor employed in such a motor will be described with reference to FIG. Rotor 3
1 is provided with a rotor core and a shaft 32 as an output shaft. The rotor core is configured such that the laminated core 33 is sandwiched between a pair of end plates (end plates or holding plates) 34 and 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
A plurality of core plates 36 each having a plurality of through holes 36c for inserting magnets formed further outside 6b are laminated.

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 rotor core is formed by a through hole 36 of the laminated core 33.
After the permanent magnets 37 are inserted and arranged in the respective c, the laminated core 33 is sandwiched between the pair of end plates 34. In this state, the rivets 35 are respectively inserted into the through holes 34b and 36b.
Is inserted, and the projecting tip of the rivet 35 is caulked to be integrally fixed.

The shaft 32 has a large diameter portion 32
a of the large-diameter portion 32 a
And the diameter is the same as or slightly smaller than the through holes 34a, 36a of the end plate 34. The shaft 32 is attached to the rotor core by, for example, shrink fitting (a method in which the rotor core is heated and expanded to fit the shaft and shrinks and fixes) or a cold fit (a method in which the shaft is cooled and shrunk to fit into the rotor core and expands and fixes). The rotor 31 is constituted by being integrally attached.

[0008]

However, according to the prior art, since the laminated core and the end plate are integrally fixed by a plurality of rivets, the number of parts is large, and the number of working steps for assembling and manufacturing is increased. There was a problem that there were many. Further, since the shaft is fixed to the rotor core by a method such as shrink fitting, a special device for heating and cooling is required, and the properties of the member (for example, permanent magnet) are adversely affected by the heating and cooling. May cause restrictions on manufacturing operations,
There is also a problem that the work is not easy, such as a case where special skill is required.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a motor which can simplify the structure and facilitate the work of assembling and manufacturing. And

[0010]

[Means for Solving the Problems] In order to achieve the above object, a motor according to claim 1 includes a rotor including a shaft as an output shaft and a laminated core having a through-hole through which the shaft passes, and a stator disposed outside the rotor. A motor, wherein the rotor is configured such that the shaft is inserted into the through-hole of the end plate in a state where the laminated core is sandwiched between a pair of end plates having a through-hole at a position corresponding to the through-hole of the laminated core. It is characterized by being press-fitted and fixed. In this case,
Although not particularly limited, at least a portion of the shaft corresponding to the end plate may have a larger diameter than the remaining portion.

According to the first aspect of the present invention, the laminated core is integrated with the shaft by sandwiching the shaft between a pair of end plates fixedly pressed into the through holes. Therefore, unlike the prior art, no rivet is required, so that the number of components is small and the configuration is simple. In addition, since the shaft is fixed to the through hole of the end plate by press-fitting, the press-fitting is extremely easy compared to conventional shrink-fitting or cold-fitting, and significantly reduces the man-hours for motor assembly and manufacturing. Can be reduced. Further, a special device for heating or the like is not required, and a member such as a permanent magnet is not adversely affected by heat.

2. Although not particularly limited in the above invention, as in the motor according to claim 2, the end plate has at least one protruding pin substantially parallel to a center axis of the through hole of the end plate, and The core may be configured to have a hole at a position corresponding to the pin, into which the pin is pressed.

In the motor according to the first aspect of the present invention, the laminated core is integrally fixed by being sandwiched between the pair of end plates, and it is considered that the mutual integrity can be sufficiently secured by this. If the pins of the end plate are press-fitted into the holes formed in the laminated core as in the motor according to the second aspect, the integrity of the laminated core and the end plate can be further ensured.

3. Although not particularly limited in the above invention, as in the motor according to claim 3, the end plate has a cylindrical projecting inner ring continuous with the through hole, and the inner ring is inserted into the through hole of the laminated core. Can be done.

In the motor according to the third aspect of the present invention, since the end plate has the inner race, the size of the through-hole into which the shaft of the end plate is press-fitted is increased in the direction of the center axis, and the end plate is press-fitted into the through-hole. Since the area of the joint portion between the fixed shaft and the shaft is increased, the integrity of the shaft and the end plate (laminated core) can be further ensured. In this case, in this case, the inner race of the end plate can be press-fitted or fitted into a through hole through which the shaft of the laminated core passes, so that the integrity of the end plate and the laminated core is further improved. can do.

4. Although not particularly limited in the above invention, after the shaft is press-fitted and fixed to the end plate as in the motor according to claim 4, a part near the joint between the end plate and the shaft is caulked (plastic deformation). Do).

In the motor according to the first aspect, the shaft is press-fitted and fixed in the through holes of the pair of end plates, and it is considered that the mutual integrity can be sufficiently secured by this. By crimping a part near the joint between the shaft and the end plate after press-fitting the shaft into the end plate as in the motor described above, the integrity of the shaft and the end plate can be further ensured.

[0018]

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. 2 is a perspective view of the rotor according to the embodiment, FIG. 3 is an exploded perspective view of the same rotor, and FIG. 4 is a cross-sectional view of the same rotor.

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 constituted 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 a laminated core 11 between a pair of end plates (end plates or holding plates) 12, and a plurality of permanent magnets 13 are mounted (buried) inside the laminated core 11.

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. By punching and forming a magnetic sheet metal by a press device or the like, a plurality of through holes 14a are formed in the center of the disk, and a plurality of the through holes 14a are arranged outside the through holes 14a. In this embodiment, four (4) pin insertion through-holes 14b and a plurality (four in this embodiment) of magnet insertion through-holes formed in an array outside the pin insertion through-holes 14b. 14c is formed. The through hole 14c for inserting a magnet has a shape corresponding to the permanent magnet 13 inserted and arranged therein, and in this embodiment, is a substantially arc-shaped long hole.

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 slightly larger than the diameter of 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 includes the core plate 1
A plurality of protruding pins 12b that can be press-fitted into the through-holes 14b are integrally formed at positions corresponding to the through-holes 14b for pin insertion of No. 4. The end plate 12 is not particularly limited, but can be manufactured using, for example, brass, and the plate thickness of this embodiment is about 1.0 mm.

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.

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 an arc plate shape are inserted and fixed so as to correspond to the respective magnet insertion through holes 14c.

Next, the pair of end plates 12 are press-fitted with the inner races 12c into the through holes 14a at the center of the laminated core 11, and each pin 12b of the end plate 12 is inserted into a corresponding pin of the laminated core 11. The rotor core 4 is pressed into the through hole 14b and integrated with each other while the laminated core 11 is sandwiched between the pair of end plates 12.
To manufacture.

Then, 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 therewith. The rotor 2 as shown in FIG.

According to the above-described embodiment, the permanent magnet 13
The laminated core 11 in which is embedded a pair of end plates 12
The end plate 12 is inserted into the through hole 14a at the center of the laminated core 11 and the through hole 14b for inserting a pin.
The inner ring 12c and the corresponding pin 12b are press-fitted and fixed to form the rotor core 4, and the large-diameter portion 5a of the shaft 5 is press-fitted and fixed to the through hole 12a at the center of these end plates 12 to fix the shaft 5 to the rotor core 4. It is designed to be attached integrally.

Therefore, since rivets are not used unlike the prior art, the number of parts can be reduced accordingly. In addition, the shaft 5 is attached to the rotor core 4 through the through-hole 1 of the inner race 12 c of the pair of end plates 12.
Just press-fit the large diameter part 5a of the shaft 5 into 2a,
Since there is no need to perform heating or cooling as compared with the conventional shrink-fitting or cold-fitting methods, there is no need for a dedicated device and the like, and the shaft 5 is simply press-fitted. Work man-hours for the work can be significantly reduced.

Further, since the inner ring 12c and the plurality of pins 12b formed integrally with the end plate 12 are pressed into the corresponding through holes 12a and 12b of the laminated core 11, the end plate 12 and the laminated core 11 are formed. Are reliable, and the positional relationship between the end plate 12 and the laminated core 11 does not shift due to the rotation of the motor 1 and the like, and the durability and reliability are high.

After the shaft 5 is press-fitted into the through hole 12a of the end plate 12, the end plate 12
Can be caulked (plastically deformed) to improve the pressure-bonding property to the shaft 5, and in this way, the integrity of the shaft 5 and the rotor core 4 can be further improved. In this case, if a groove or the like is formed in a portion of the shaft 5 corresponding to the caulked portion of the end plate 12 and a part of the caulked portion is filled in the groove, further integration can be achieved. Can be improved. The same is true even when a part of the shaft 5 is swaged. Further, by forming a key groove in the shaft 5 and the end plate 12 and press-fitting the key into the key groove after press-fitting and fixing, it is possible to enhance the integrity.

In the above embodiment, the end plate 12
The inner ring 12c is press-fitted into the through hole 14a at the center of the laminated core 11, but the outer diameter of the inner ring 12c is substantially the same as that of the through hole 14a so that the inner ring 12c is fitted. The outer diameter may be smaller than that of the through hole 14a.

Although the shaft 5 has a large-diameter portion 5a at all portions corresponding to the rotor core 4, only the portion (two locations) corresponding to the end plate 12 may have a large-diameter portion. By doing so, the press-fitting operation can be facilitated. Further, in this case, the large-diameter portion on the front end side of the shaft 5 in the press-fitting direction is made smaller in diameter than the large-diameter portion on the rear end side, and the diameter of the through hole 12a of the inner ring 12c of each end plate 12 is made to correspond to them. Thus, the press-fitting operation of the shaft 5 can be further facilitated.

In addition, the pins 12b of the end plate 12
And the outside of the inner ring 12c can be tapered,
Thereby, the laminated core 1 of the pin 12b and the inner ring 12c is formed.
Since the press-fitting into the corresponding through-holes 14a and 14b becomes smooth, the work of integrating the end plate 12 and the laminated core 11 becomes easy. The inner ring 12c of the end plate 12 projects only toward the laminated core 11, but may project only toward the opposite side.
Or you may make it protrude to both sides.

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, the motor to which the present invention can be applied is not limited to the motor of the above-described embodiment, but may be applied to a motor of another configuration as long as it is an inner rotor type motor. Further, the number of layers of the core plate 14 constituting the laminated core 11,
The number of 2b and the like are not limited to the above-described embodiment, and are arbitrary.

[0040]

As described above, according to the present invention, there is provided an effect that a motor having a small number of parts, a simple structure, and easy assembling and manufacturing operations 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 core of the motor according to the embodiment of the present invention.

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

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

FIG. 5 is an exploded perspective view showing a rotor core of a motor according to the related art.

[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 14b ... Through hole for pin 14c ... Through hole for magnet

Claims (4)

[Claims] 1. A rotor (2) including a shaft (5) as an output shaft and a laminated core (11) having a through hole (14a) through which the shaft passes, and a stator (3) disposed outside the rotor. ), Wherein the rotor is sandwiched between a pair of end plates (12) having through holes (12a) at positions corresponding to the through holes of the laminated core. A motor configured to press-fit and fix the shaft into the through hole of the end plate. 2. The end plate (12) has at least one protruding pin (12b) substantially parallel to the center axis of the through hole (12a) of the end plate, and the laminated core (11) is The motor according to claim 1, further comprising a hole (14b) into which the pin is press-fitted, at a position corresponding to the pin. 3. The end plate (12) has a cylindrically projecting inner ring (12c) continuous with the through hole (12a), and the inner ring is provided in the through hole (1) of the laminated core (11).
The motor according to claim 1, wherein the motor is inserted in 4a). 4. The motor according to claim 1, wherein after the shaft (5) is press-fitted and fixed to the end plate (12), a part near a joint between the end plate and the shaft is caulked. .