JP2001045703A - Rotor for motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain cost reduction and vibration isolating effect, in a rotor for a motor. SOLUTION: This motor has a rotor inside a stator, producing a rotating magnetic field. A magnet 10 is retained on a shaft 13 by the use of vibration isolating parts 15a, 15b which are formed by integrating cushioning members 11a, 11b fitted into stage-differences 10a, 10b formed out of protruding parts formed inside the magnet 10 located around the rotor, steel plates 12a, 12b located on the outer periphery of the cushioning members 11a, 11b and partially- embedded thereinto, and bearing parts 14a, 14b fixed on the shaft 13. The vibration isolating parts 15a, 15b are fitted into step differences 10a, 10b of the magnet 10 from both sides of the magnet 10, and the shaft 13 is then inserted into the vibration isolating parts 15a, 15b and retained by E-shaped snap rings 16a, 16b.

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 (such as an air conditioner), and more particularly to a rotor for a motor having a magnet holding structure.

[0002]

2. Description of the Related Art An electric motor has a rotor inside a stator that generates a rotating magnetic field. As shown in FIGS. 7 and 8, for example, the rotor inserts cushioning members (rubber) 4 and 5 between a core 2 fixed to a shaft 1 serving as a rotation center and a magnet 3 arranged on the outer periphery. The steel plates 6 and 7 are attached from the axial direction 1 and the pins 8 penetrate the steel plates 6 and 7 and the rubbers 4 and 5 and are stopped by stoppers 9. In addition,
FIG. 7 is a schematic sectional view taken along line A-AA of FIG.

At this time, since the iron plates 6 and 7 push the rubbers 4 and 5 into the inside, the rubbers 4 and 5 are left and right (up and down in FIG. 4).
The magnets 3 are held by the core 2 and both ends (right and left in FIG. 7) of the magnet 3 are suppressed by the rubbers 4 and 5. According to the configuration of the rotor, the rubbers 4, 5
Not only can the magnet 3 be held by the core 2, but also the vibrations caused by the rotation of the magnet 3 are absorbed by the rubbers 4 and 5, so that the vibration is not transmitted to the core 2 and the shack 1, and the vibration proof effect and the eccentricity preventing effect Will be exhibited.

[0004] Specifically, please refer to Japanese Patent Application Laid-Open No. 9-149571. According to this publication, the buffer members of rubbers 4 and 5 are divided into two in order to insert the buffer members in the axial direction of the shaft 1, so that the buffer members 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]

In the rotor of the electric motor, two iron plates 6, 7,... Are provided in order to hold the magnet 3 and prevent the rotor from being centered, eccentric or inclined.
There is a disadvantage that the cost is increased because the components of the pin 8 and the stopper 9 are required. Further, in order to hold the magnet 3 on the shaft 1, for example, an iron core of the core 2 that is formed by punching and laminating a core sheet is required.
However, in the motor, it is preferable to reduce the cost as much as possible, considering that cost reduction is a very important factor. ,

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a rotor for an electric motor capable of preventing vibration, eccentricity and inclination of the rotor at low cost. Is to do.

[0007]

In order to achieve the above-mentioned object, the present invention has a rotor inside a stator for generating a rotating magnetic field, the outer periphery of the rotor being a magnet, and the magnet being attached to the rotor. A rotor of an electric motor held on a shaft of the rotor, wherein a step is provided on an inner edge of the magnet as a convex portion, and a bearing portion fixed to the shaft,
A cushioning member arranged between the bearing portion and the magnet, and an iron plate for pressing the cushioning member from the axial direction of the shaft, at least the iron plate is partially embedded in the cushioning member, and A vibration isolating means in which the bearing portion is integrated with the buffer member is obtained, and the vibration isolating means is fitted into a step formed by a convex portion of the magnet, so that the magnet is held on the shaft.

According to the present invention, a rotor is provided inside a stator that generates a rotating magnetic field, and an outer periphery of the rotor is a magnet,
A rotor of an electric motor for holding the magnet on a shaft of the rotor, wherein a step is provided on an inner edge of the magnet with the inside of the magnet being a convex portion, and an uneven shape is provided on a surface of the step, A bearing portion fixed to the bearing portion, a buffer member disposed between the bearing portion and the magnet, and an iron plate that presses the buffer member from the axial direction of the shaft, and at least partially covers the iron plate. An anti-vibration means embedded in the buffer member and integrating the bearing portion with the buffer member is obtained, and the anti-vibration means is fitted into a step formed by the convex portion of the magnet and an uneven shape of the step surface. A bearing ring is fitted to a shaft passing through the center to stop the bearing portion, and the magnet is held on the shaft.

According to the present invention, a rotor is provided inside a stator for generating a rotating magnetic field, and the outer periphery of the rotor is a magnet.
A rotor of an electric motor for holding the magnet on a shaft of the rotor, wherein the shaft has a long convex portion in the axial direction of the shaft, and the inside of the magnet has a convex portion and a step is formed on an edge of the inside. And, provided with a concave and convex shape on the surface of the step, a bearing portion having a groove to be fitted to the convex portion of the shaft and fixed to the shaft, and disposed between the bearing portion and the magnet, A buffer member having a concave portion fitted to the convex portion, and an iron plate that presses the buffer member from the axial direction of the shaft, wherein at least the iron plate is partially embedded in the buffer member, and the bearing portion is A vibration isolator integrated with the cushioning member is obtained, and the pair of the vibration isolator is fitted from both sides of the magnet into a step formed by a convex portion and an uneven shape of the step surface, and is fixed to a shaft passing through the center of the vibration isolator. The wheel Stopping the bearing portion Te, and characterized in that the said magnet the like will be held in the shaft.

A groove of at least one of the bearing portions constituting the pair of vibration isolating means extends from one end to the other end. In assembling the rotor,
After the pair of vibration isolating means is fitted to the magnet, the shaft may be inserted from the one bearing portion side.

[0011] The groove of the bearing portion constituting the pair of vibration isolating means is set to a predetermined distance from one end, and in assembling the rotor, at least one of the pair of vibration isolating means. After the means is fitted to the magnet, the shaft may be passed through the bearing of the one vibration isolator, and the bearing of the other vibration isolator may be inserted into the shaft.

[0012]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described in detail with reference to FIG. 1 is a schematic sectional view taken along line B-BB of FIG. 2, and FIG. 3 is a sectional view taken along line C-CC of FIG.
FIG. 5 is a schematic sectional view taken along line D-DD of FIG.

In FIGS. 1 to 3, the rotor of the electric motor according to the present invention is provided with a cushioning member (rubber) which is fitted in contact with steps 10a and 10b formed by convex portions provided on the inner peripheral side of the magnet 10 located on the outer peripheral side. 11a, 11b, iron plates 12a, 12b located near the outer periphery of the buffer members 11a, 11b and partially buried, and bearing portions 14a located on the inner periphery of the buffer members 11a, 11b and fixed to the shaft 13 , 1
4b are integrated with each other to obtain anti-vibration components 15a and 15b. The pair of anti-vibration components 15a and 15b are fitted from both sides of the magnet 10, and a pair of anti-vibration components 15a and 15b are provided.
Through the shaft 13, and E-shaped retaining rings 16a, 16b
Stop it.

The shaft 13 is provided with a protruding portion 13a which is long in the axial direction, and the bearing portions 14a, 14b are formed with grooves 14aa, 14bb which fit into the protruding portion 13a. Note that, from the viewpoint of easy insertion of the shaft 13, a plurality of grooves 14aa and 14bb may be provided (see a broken line in FIG. 3).

The groove 14aa of the bearing portion 14a extends from one end to the middle, and the groove 14bb of the bearing portion 14b extends from one end to the other end so as to enable assembly of a rotor described later. As a result, the bearings 14a and 14b are fixed to the shaft 13, and the radial direction of the rotor is fixed.

The step 10 due to the convex portion of the magnet 10
In order to make the surfaces a and 10b (surfaces perpendicular to the shaft 13) uneven, the surfaces thereof have convex portions 1 at predetermined intervals in the circumferential direction.
0aa and 10bb are formed.

On the side of the cushioning members 11a and 11b which contact the steps 10a and 10b, recesses are formed for fitting into the irregularities. Thus, the step 10
a, 10b of the buffer member 11
a, 11b, the cushioning member 11
a, 11b are fixed in the radial direction of the rotor.

As shown in FIGS. 4 and 5, an iron plate 12a is partially embedded in the cushioning member 11a of the vibration isolating component 15a. Therefore, the protrusion 1 is provided on the inner peripheral side of the iron plate 12a.
2aa is provided, and a concave portion that fits into the convex portion 12aa is formed on the outer peripheral side of the buffer member 11a.
a is integrated with the buffer member 11a.

The cushioning member 11a, the iron plate 12a and the bearing 14a are integrally formed. For example, iron plate 12a
And the bearing portion 14a are housed in a mold, and the material of the cushioning member 11a is injected into the mold to absorb the cushioning member 11a and the iron plate 12a.
And the bearing portion 14a are integrally formed, and this is
a. Similarly, for the other anti-vibration component 15b, the iron plate 12b and the bearing portion 14b are similarly placed in a mold, and the material of the cushioning member 11b is injected into this mold to form the cushioning member 11b.
b, the iron plate 12b and the bearing portion 14b are integrally formed.

The anti-vibration components 15a and 15b in which the buffer member 11a, the iron plate 12a and the bearing 14a are integrated are fixed in the radial direction of the rotor. That is, as described above, the radial direction is fixed in the relationship between the magnet 10 and the cushioning members 11a and 11b, and the radial direction is fixed in the relationship between the shaft 13 and the bearing portions 14a and 14b. It is.

In assembling the rotor having the above structure,
First, a pair of anti-vibration components 15a and 15b are fitted into the steps 10a and 10b from both sides of the magnet 10 so that the magnet 1
Set to 0. Subsequently, the shaft 1 is moved from the vibration isolating component 15b side.
3, and the protrusion 13a of the shaft 13 is fitted into the groove 14bb of the bearing 14b and the groove 14aa of the bearing 14a of the vibration isolating component 15a.

Subsequently, the E-shaped retaining rings 16a and 16b are fitted into the shaft 13, and the vibration isolating components 15a and 15b are fixed in the axial direction of the shaft 13. At this time, the E-shaped retaining ring 16
a, 16b as well as anti-vibration parts 15a, 15b
It is more preferable to screw the bearings 14a and 14b. Thereby, the vibration isolating component 1
5a and 15b are fixed to the shaft 13 and the magnet 1
0 is held on the shaft 13 via the buffer members 11a and 11b. Thus, the magnet 10 and the shaft 13
Since the cushioning members 11a and 11b are interposed between the magnets 10, vibration, eccentricity and inclination due to rotation of the magnet 10 can be prevented.

Also, as compared with the prior art, the cushioning member 11
a, 11b, iron plates 12a, 12b, bearing portions 14a, 14
Although the b and E-shaped retaining rings 16a and 16b are required, a core (iron core) for holding the magnet 10 on the shaft 13 is not required, cost can be reduced, and structural weight can be reduced. . Further, the buffer members 11a,
11b, iron plates 12a and 12b and bearing portions 14a and 14
Since the anti-vibration parts 15a and 15b made of b are integrally formed in advance, assembly of the rotor is easy, that is, the number of manufacturing steps is extremely small, and the manufacturing cost can be reduced.

FIG. 6 is a schematic sectional view of a rotor showing another embodiment of the present invention. FIG. 6 corresponds to FIG. 1, and the same portions are denoted by the same reference numerals, and redundant description will be omitted.

In FIG. 6, the rotor according to the present invention uses a bearing 14c having a groove 14cc extending from one end to an intermediate portion instead of the bearing 14b of the previous embodiment. That is, the bearing portion 14c
Has the same structure as the bearing portion 14a of the vibration isolating component 15a, and the protrusion 13c of the shaft 13 is the same as the protrusion 13a of the previous embodiment.
It is shorter than. This is because the length of the projection 13c in the axial direction is a length in consideration of the size of the rotor.

In this case, in assembling the rotor, the vibration isolating components 15a and 15b are connected to the magnet 1 as in the previous embodiment.
The shaft 13 cannot be inserted after both sides of the shaft 13 are inserted. However, for example, after inserting one anti-vibration component 15a into the magnet 10, the shaft 13 is inserted into the anti-vibration component 15a, and the other anti-vibration component is inserted into the shaft 13. The component 15b is inserted and fitted into the magnet 10. In this embodiment, although the order of assembling the rotor is different from that of the previous embodiment, not only the same effects as in the previous embodiment are exerted, but also the shaft 13 and the vibration isolating parts 15a, 15b can be easily inserted and assembled. easy.

[0027]

According to the present invention described above, the following effects can be obtained. The rotor of the electric motor of the present invention has a step on the inner edge of the magnet as a convex portion,
A bearing portion fixed to the shaft, a buffer member disposed between the bearing portion and the magnet, and an iron plate for pressing the buffer member in the axial direction of the shaft are provided. Embedded in the bearing, and obtained a vibration isolating means in which the bearing part is integrated with the buffer member, and since this vibration isolating means is fitted into a step formed by the convex portion of the magnet, the magnet can be held on the shaft, The buffer member for holding the magnet has the effect of preventing vibration, eccentricity, and inclination during rotation of the rotor.

Further, since the rotor does not require a core (iron core), not only can the cost of the electric motor be reduced, but also the structural weight can be reduced. Further, the use of the integrally formed vibration isolating means has an effect that the rotor can be easily assembled.

Further, the surface of the step is made uneven, and a shape that fits into the uneven shape is provided on the cushioning member. Further, the shaft is provided with a protruding portion that is long in the axial direction of the shaft. Is provided with a groove that fits into the convex part and the bearing part is stopped by a retaining ring (E type), so that the rotor can be securely fixed in the rotational direction (circumferential direction) and axial direction. There is an effect that can be.

[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 for explaining the rotor shown in FIG. 1;

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

FIG. 4 is a schematic plan view for explaining a vibration isolating component of the rotor shown in FIG. 1;

FIG. 5 is a schematic sectional view for explaining the vibration isolating component shown in FIG. 4;

FIG. 6 is a schematic cross-sectional view of a rotor of an electric motor showing another embodiment of the present invention.

FIG. 7 is a schematic sectional view of a rotor of a conventional electric motor.

FIG. 8 is a schematic plan view of the rotor shown in FIG. 7;

[Explanation of symbols]

Reference Signs List 10 Magnet 10a, 10b Step (due to convex portion on the inner peripheral side of magnet) 10aa, 10bb Projected portion (of step surface) 11a, 11b Buffer member (rubber) 12a, 12b Iron plate 12aa, 12bb Projected portion (of iron plate) 13 Shaft 13a, 13c Convex part (of shaft) 14a, 14b, 14c Bearing part 14aa, 14bb, 14c Groove (of bearing part) 15a, 15b Anti-vibration parts 16a, 16b E-shaped retaining ring

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Suzuki 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 AA04 AA08 AB07 AC06 AC08 AC09 AE08 5H605 AA04 BB05 CC03 DD21 EB17 EB18 FF08 5H622 CA01 CA05 CB04 CB06 PP04 PP10 PP12 PP16 PP17 QA02

Claims (5)

[Claims] 1. A rotor of an electric motor having a rotor inside a stator that generates a rotating magnetic field, an outer periphery of the rotor being a magnet, and the magnet being held on a shaft of the rotor. Providing a step on the inside edge of the magnet as a convex portion, a bearing portion fixed to the shaft,
A cushioning member arranged between the bearing portion and the magnet, and an iron plate for pressing the cushioning member from the axial direction of the shaft, at least the iron plate is partially embedded in the cushioning member, and An electric motor characterized by obtaining vibration isolating means in which the bearing portion is integrated with the cushioning member, fitting the vibration isolating means into a step formed by a convex portion of the magnet, and holding the magnet on the shaft. Rotor. 2. A rotor of an electric motor having a rotor inside a stator that generates a rotating magnetic field, an outer periphery of the rotor being a magnet, and the magnet being held on a shaft of the rotor. Providing a step on the inside edge of the magnet as a convex part, and providing an uneven shape on the surface of the step,
A bearing portion fixed to the shaft, a cushioning member disposed between the bearing portion and the magnet, and an iron plate for pressing the cushioning member in the axial direction of the shaft are provided. The vibration isolating means is embedded in the cushioning member, and the bearing portion is integrated with the cushioning member. The vibration isolating means is fitted into a step formed by the convex portion of the magnet and a concave-convex shape of the step surface. A rotor for an electric motor, wherein a retaining ring is fitted to a shaft passing through the center of a vibration means to stop the bearing portion, and the magnet is held on the shaft. 3. A rotor for an electric motor having a rotor inside a stator for generating a rotating magnetic field, an outer periphery of the rotor being a magnet, and the magnet being held on a shaft of the rotor. Providing the shaft with a long convex portion in the axial direction of the shaft, providing a step on the inner edge of the magnet as a convex portion, and providing an uneven shape on the surface of the step,
A bearing portion having a groove to be fitted to the convex portion of the shaft and fixed to the shaft, a buffer member disposed between the bearing portion and the magnet, and having a concave portion fitted to the convex portion;
An iron plate for holding the buffer member in the axial direction of the shaft, wherein at least the iron plate is partially embedded in the buffer member, and the bearing portion is integrated with the buffer member. A pair of the vibration isolating means is fitted from both sides of the magnet into a step formed by a convex portion and an uneven shape of the step surface, a snap ring is fitted to a shaft passing through the center of the vibration isolating means, and the bearing portion is stopped. The rotor of the electric motor is adapted to be held on the shaft. 4. A groove of at least one of the bearings constituting the pair of vibration isolating means extends from one end to the other end, and in assembling the rotor, 4. The rotor for an electric motor according to claim 3, wherein the shaft is inserted from the one bearing portion side after fitting the pair of vibration isolating means to the magnet. 5. A groove of a bearing part constituting said pair of vibration isolating means is set to a predetermined distance from one end, and in assembling said rotor, at least one of said pair of vibration isolating means. 4. The rotation of the electric motor according to claim 3, wherein the shaft is passed through the bearing of the one vibration isolator and the bearing of the other vibration isolator is inserted into the shaft after the vibration isolator is fitted to the magnet. Child.