JP2000295806A - Rotor of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To retain a magnet and obtain a vibration-proof effect with a small number of components. SOLUTION: Four receiving parts 11 protruding toward a shaft 1 are formed in a circumferential direction on the inner circumference of a magnet 10 around a rotor with predetermined intervals. Four receiving parts 13 protruding toward the magnet 10 are formed on the outer circumference of a core fixed to the shaft 1. Rubber buffer members 14 and 15 are provided in the axial direction of the shaft 1 so as to hold the receiving parts 11 and 13 between them. The respective receiving parts 13 have a rod part 13a which penetrates the rubber buffer members 14 and 15 in parallel with the shaft 1 so as to have a T-shape and nail parts 13b and 13c are integrally formed on both the tips of the rod parts 13a. The respective nail parts 13b and 13c are inserted through end plates 16 attached to the end surfaces of the rubber members 14 and 15 and engaged with the end plates 16. The rubber members 14 and 15 are compressed in an axial direction by the end plate 16 and the receiving parts 11 and 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor for a motor used for home electric appliances (air conditioners) and the like, and more particularly to a rotor for a motor having a feature of holding a magnet.

[0002]

2. Description of the Related Art As shown in, for example, FIG. 4 (a sectional view taken along the line A--AA in FIG. 5) and FIG. 5, a rotor of an electric motor comprises a core 2 fixed to a shaft 1 serving as a rotation center, and an outer peripheral portion. Cushioning member (rubber) 4 between the cylindrical magnet 3 and
5 are inserted, the iron plates 6 and 7 are attached from the axial direction of the shaft 1, and the pins 8 are penetrated through the iron plates 6 and 7 and the rubbers 4 and 5 and are stopped by stoppers 9. According to this, since the iron plates 6 and 7 push the rubbers 4 and 5 into the inside and expand the rubbers 4 and 5 left and right (up and down in FIG. 4), the magnet 3 is held by the core 2 and the rubber 4 and 5 are pressed. , 5
Thereby, both ends (left and right in FIG. 4) of the magnet 3 are suppressed.

As a result, not only can the magnets 3 be held on the core 2 by the rubbers 4 and 5, but also the vibration caused by the rotation of the magnet 3 is absorbed by the rubbers 4 and 5, so that the core 2 and the shak 1 Without being transmitted, an anti-vibration effect and an eccentricity prevention effect can be exhibited.

[0004] More specifically, for example, Japanese Patent Application Laid-open No. Hei 9-14957.
In this prior example, in order to insert the cushioning members made of rubbers 4 and 5 from the axial direction of the shaft 1, the cushioning member is divided into two parts so that the cushioning member can be easily inserted. In addition, the eccentricity and inclination of the rotor due to the displacement of the contact portion between the buffer member and the magnet 3 and the contact portion between the buffer member and the core 2 are prevented by the shape of the buffer member divided into two.

[0005]

However, in the above configuration, the two iron plates 6, 7 and 7 are used to hold the magnet 3 and prevent the rotor from being decentered, eccentric or inclined.
It requires many parts such as pin 8 and stopper 9,
There is a problem that the cost increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to prevent the rotor from vibrating, prevent eccentricity and prevent tilting, and realize the structure with a small number of parts. An object of the present invention is to provide a rotor for an electric motor capable of reducing costs.

[0007]

In order to achieve the above object, the present invention is directed to a rotor disposed inside a stator for generating a rotating magnetic field, the outer periphery of which is constituted by a cylindrical magnet. In addition, a core is fixed to a shaft serving as a rotation axis, and the magnet is held on the core via a buffer member. A plurality of first receiving portions each formed of a convex portion extending in the radial direction toward the magnet are formed at predetermined intervals along the circumferential direction, and the convex portion extending radially toward the magnet on the outer peripheral surface side of the core. A plurality of second receiving portions are formed so as to be alternately arranged on the same circumference with respect to each of the first receiving portions, and a pair of left and right discs is formed on both sides of the first and second receiving portions. The cushioning member of End plates are respectively attached to both outer side surfaces of the buffer member, and the end plates are connected to each other by a connecting means penetrating through the buffer member so as to compress the buffer member. It is characterized by.

[0008] The connecting means may comprise a bolt and a nut, but in the present invention, as a preferred embodiment, the connecting means penetrates through the inside of the cushioning member from the second receiving portion in parallel with the axis of the shaft. A connecting means comprising a pair of left and right engaging claws extending and an engaging hole formed in the end plate is adopted.

Further, it is preferable that the second receiving portion on the core side is formed integrally with the core by a plastic resin, whereby the magnet holding mechanism can be easily manufactured, lightened, and reduced in cost. Can be realized.

It is preferable that the axis of the engaging claw and the axis of the engaging hole are displaced so as not to hinder the fitting. Durability can be improved.

[0011]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described in detail with reference to FIG. In the figure, the same parts as those in FIG. 4 are denoted by the same reference numerals, and redundant description will be omitted. FIG. 1 is a schematic sectional view taken along the line B-BB shown in FIG.

1 and 2, a rotor of a motor according to the present invention has a cylindrical magnet 10 constituting an outer peripheral portion.
A plurality (for example, four) of convex portions having a predetermined thickness toward the shaft 1 are provided at equal intervals in the circumferential direction on the inner periphery as the first receiving portions 11.

On the other hand, on the outer periphery of the core 12 fixed to the shaft 1, the magnet 1 is located between the first receiving portions 11.
A plurality of (for example, four) second receiving portions 13 having a predetermined thickness toward 0 are provided.

A pair of cushioning members (rubbers) 14 and 15 are interposed between the receiving portions 11 and 13 so as to sandwich the receiving portions 11 and 13 from the axial direction of the shaft 1. Add end plates 16 and 17 respectively,
The end plates 16, 17 and the receiving portion 13 are connected to each other so that the rubber 1
The rubbers 14 and 15 are pressed into the inner surface of the magnet 10 and the outer surface of the core 12 to hold the magnet 10 on the core 12.

The second receiving portion 13 on the core 12 side has a rod-like portion 13a as an engaging claw parallel to the shaft 1 at its tip.
And has a T-shaped cross section. In this case, the receiving portion 13 and the end plate 16,
In order to connect the rod 17 to the rod 17, claws 13 b and 13 c are provided in a direction perpendicular to the rod 13 a.

The rod-shaped portion 13a and the claw portions 13b,
The receiving portion 13 having 13 c is preferably formed integrally with the core 12, and the rod portion 13 a has a cylindrical shape, but may have a prismatic shape.
The tip shape of c is rectangular, but may be elliptical (tongue shape).

Each rubber 14, 15 not only sandwiches the receiving portions 11, 13 but also has a hollow circular shape in contact with the inner peripheral surface of the magnet 10 and the outer peripheral surface of the core 12, and has a cross section taken along an axis perpendicular to the shaft 1. Symmetrically, magnet 10 and core 1
The shape fits between the two. Therefore, the rubber 14,1
Reference numeral 5 abuts on the inner peripheral surface of the magnet 10 and the outer peripheral surface of the core 12 to fill the space between the receiving portions 11 and 13. Each of the rubbers 14 and 15 has a rod-shaped portion 13a on the core 12 side.
Have holes 14a and 15a passing therethrough.

The end plates 16 and 17 attached to the respective end surfaces of the rubbers 14 and 15 have a circular shape having a hole having a diameter larger than at least the diameter of the core 12. The end plates 16 and 17 are connected to the claw portions 13b and 13c. Holes 16a and 17a are provided at opposing positions.

Holes 14a, 1 formed in rubbers 14, 15
The shape of 5a may be a hole slightly smaller than the claw portions 13b, 13c, and the holes 16a, 1
The shape of 7a is shorter in the radial direction than the claw portions 13b, 13c, and needs to be large enough to securely lock the claw portions 13b, 13c to the end plates 16, 17. Note that the rotor has a symmetric structure with respect to an axis perpendicular to the shaft 1, as is clear from FIGS.

According to the rotor having the above-mentioned structure, as shown in FIG. 3, first, the magnet 10 and the shaft 1 to which the core 12 is fixed are arranged in a predetermined positional relationship, and the rubbers 14 and 15 are attached to the left and right sides of the shaft 1. Install it inside from the direction.
Therefore, the holes 14 and 15a of the rubbers 14 and 15 are inserted into the rod-shaped portion 13a and the claw portions 13b and 13b of the receiving portion 13, respectively.
c, the rubbers 14 and 15 are inserted into the center of the inside of the magnet 10 and the receiving portion 11 of the magnet 10 and the core 1 are inserted.
The convex portion, which is the second receiving portion 13, is sandwiched. FIG. 3 corresponds to FIG.

Accordingly, the outer peripheral side surfaces of the rubbers 14 and 15 are in contact with the inner peripheral surface of the magnet 10, and the inner peripheral side surfaces are in contact with the outer peripheral surface of the core 12. In this case, the hole 14
Even if the shapes of the holes 14a and 15a are slightly smaller than the shapes of the claws 13b and 13c, the holes 14
The rod-shaped portion 13a and the claw portions 13b, 13
c can easily pass through.

Subsequently, the receiving portion 13 on the core 12 side and the end plate 1
In order to connect the end plates 16 and 17, the end plate 16 is pressed against the end surface of the rubber 14, and the end plate 17 is pressed against the end surface of the rubber 15.

As a result, the hole 16a is formed in the rod-shaped portion 13a.
Of the end plate 1
Lock to 6. At the same time, the hole 17a is
3a is pushed into the claw portion 13c at the other end, and the claw portion 13c is locked to the end plate 17.

In this case, since the head sides of the claw portions 13b and 13c are oblique, the holes 16a and 17a of the end plates 16 and 17 are formed.
Can be easily fitted to the claws 13b, 13c, and the claws 13b, 13c can be simultaneously locked to the end plates 16, 17.

The core 12 is formed integrally with the shaft 1, and a plastic resin is used as the material. Further, the receiving portion 13, the rod-shaped portion 13a and the claw portions 13b, 1
As a material of 3c, a plastic resin is used.
When the same plastic resin or metal is used as the material of the sixth and the 17th, easiness of manufacture, weight reduction of the rotor, and cost reduction can be achieved.

Further, the rod portion 13a, the claw portions 13b, 1
The receiving portion 13 including 3c and the end plates 16, 17 can be made of the same metal material. In this case, the end plate 1
The holes 16a and 17a of the holes 6 and 17 are shaped so as to match the claws 13b and 13c.
If it is slightly shifted from the center of b, 13c, the claw 13
b, 13c can be locked on the surface of the end plate 16.

The length of the rod portion 13a of the receiving portion 13 is determined in consideration of the thickness of the rubbers 14 and 15 (the length in the axial direction of the shaft 1) and the thickness of the end plates 16 and 17. At this time, when the end plates 16 and 17 are attached to the ends of the rubbers 14 and 15, the claw portions 13b and 13c can be confirmed.

Thus, the magnet 10 can be securely held on the core 12 by the rubbers 14 and 15, the positioning of the claw portion 13b and the hole 16a of the end plate 16, and the positioning of the claw portion 13c and the hole of the end plate 17 can be achieved. 17a can be easily aligned.

As described above, the receiving portion 13 on the core 12 side and the end plates 16 and 17 are connected, and the end plates 16 and 17 are
15, the rubbers 14, 15 not only strongly press the receiving portions 11, 13, but also
Since the magnet 10 expands toward the core 12, the magnet 10 can be held by the core 12. In addition, only the rubbers 14 and 15 and the end plates 16 and 17 are required as the holding parts, and the number of parts is small.

Furthermore, since the structure of the rotor is symmetrical with respect to the axis perpendicular to the shaft 1, the balance of the rotor is good, and the rubbers 14, 15 and the end plate 1
Since the shapes 6 and 17 may be the same, a reduction in manufacturing cost can be expected.

[0031]

According to the present invention described above, the following effects can be obtained. That is, in the present invention, the magnet-side receiving portion and the core-side receiving portion are sandwiched between a pair of cushioning members (rubber), and end plates are attached to the ends of these cushioning members, and provided on the core-side receiving portion. The tip claw portion of the rod-shaped member is locked to the end plates to press the cushioning member into the rotor, and the magnet-side receiving portion and the core-side receiving portion are pressed and connected to each other. Since the magnet is in contact with and pressed against the inner periphery of the magnet and the outer periphery of the core, there is an effect that the magnet can be securely held by the core. At this time, since the holding is performed via the buffer member, there is an effect that vibration prevention, eccentricity prevention, and inclination prevention during rotation of the rotor can be achieved.

Further, by forming at least the core-side receiving portion, the rod-shaped portion, and the claw portion integrally, and also forming the magnet-side receiving portion integrally, the buffer member and the end plate are required to hold the magnet. Since only use is required, the number of parts can be reduced, and the cost of the electric motor can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a rotor of an electric motor according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of the rotor shown in FIG.

FIG. 3 is a schematic sectional view of the rotor for explaining the rotor shown in FIG. 1;

FIG. 4 is a schematic sectional view of a rotor of a conventional electric motor.

FIG. 5 is a schematic plan view of the rotor shown in FIG. 4;

[Explanation of symbols]

 Reference Signs List 1 shaft (rotating shaft) 10 magnet 11 receiving part (on magnet 10 side) 12 core 13 receiving part (on core 12 side) 13a rod-shaped part 13b, 13c claw part 14, 15 rubber (buffer member) 14a, 15b hole 16, 17 End plate 16a, 17a hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Takashi Suzuki, Inventor 1116, Suenaga, Takatsu-ku, Kawasaki, Kanagawa Prefecture Inside Fujitsu General Co., Ltd. (72) Inventor Toshiaki Tanno 1116, Suenaga, Takatsu-ku, Kawasaki City, Kanagawa F Terms (reference) 5H002 AA00 AA04 AC08 5H622 CA01 CA05 CB04 PP04 PP10

Claims (4)

[Claims] 1. A rotor arranged inside a stator for generating a rotating magnetic field, wherein an outer peripheral portion is constituted by a cylindrical magnet and a core is fixed to a shaft as a rotating shaft. In a rotor of an electric motor, wherein the magnet is held on the core via a buffer member, a first receiving portion formed of a convex portion extending radially toward the shaft on the inner peripheral surface side of the magnet is circular. A plurality of second receiving portions are formed at predetermined intervals along the circumferential direction, and a plurality of second receiving portions formed of convex portions extending radially toward the magnet are formed on the outer peripheral surface side of the core on the same circumference. A pair of left and right buffer members, which are formed so as to be arranged alternately with respect to the first receiving portion and form a disk shape on both sides of the first and second receiving portions, are arranged. End plate on side Each is additionally provided, the rotor of an electric motor the end plate to each other, characterized in that it is connected so as to compress the same buffer member by connecting means extending through said cushioning member. 2. A pair of right and left engaging claws extending from the second receiving portion through the buffer member in parallel with an axis of the shaft, and a coupling formed on the end plate side. 2. The rotor for an electric motor according to claim 1, comprising a hole. 3. The motor rotor according to claim 1, wherein the second receiving portion on the core side is formed integrally with the core by a plastic resin. 4. The rotor for an electric motor according to claim 2, wherein the axis of the engagement claw and the axis of the engagement hole are displaced so as not to hinder the fitting. .