KR0144352B1 - Rotor for magnet generator - Google Patents

Abstract

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Description

Rotor of magnet generator

1A to 1D are exploded perspective views showing a rotor of a magnet generator according to an embodiment of the present invention.

2 is a partial cross-sectional view showing the main part before the winding fixing process of the magnet generator.

3 is a partial cross-sectional view showing the main part after the winding fixing process of the magnet generator.

4 is a vertical cross-sectional view showing the assembled state of the magnet generator.

5 is a plan view of the magnet generator.

6 is a partial plan view of a magnet generator showing an intermediate assembly step;

7 is a partially enlarged cross-sectional view showing another embodiment of the magnet holding means according to the present invention.

Figure 8 is a partially enlarged cross-sectional view showing another embodiment of the magnetic holding means according to the present invention.

The present invention relates to a rotor of a magnet generator, and more particularly, to an improvement in the fixing structure of a plurality of permanent magnets. For example, the present invention relates to a technique effective for the use of a rotor of a magnet generator installed in a small or special vehicle such as a motorcycle or a bogie car.

In general, a magnet generator using a plurality of permanent magnets (hereinafter, abbreviated as magnets) is used in small or special vehicles such as motorcycles or bogies.

This type of magnet generator consists of a rotor formed by fixing a plurality of magnets at regular intervals around the inner circumference of the yoke, and a generator formed by winding a plurality of coils around the core in various radial positions. The magnet generator is configured such that electromotive force is induced in each magnetic pole coil of the generator as the rotor is driven by the engine and rotates along the circumference of the generator.

Typically, the rotor used for the magnet generator includes a case having a plurality of magnet housing chambers of a shape corresponding to the magnet. Each upper open frame of the magnet housing chamber is annularly connected to each other. The case is fitted in the yoke and the magnets are inserted into the magnet housing chamber of the case. The magnets are fastened and fastened between the partition walls between the adjacent receiving chambers of the corresponding pair. A cylindrical cover is fitted inside the case and the magnet. After the retaining ring made of resin material abuts on the upper flange of the cover, the winding fixing part formed in the outer circumferential portion of the upper end of the yoke is processed to be fixed on the retaining ring. In this way, the plurality of magnets are integrated with the yoke.

In this case, a slight gap is left between the yoke's winding fixing unit inner circumference and each magnet, so that a resin ring is mounted between the magnet and the winding fixing unit to fill this gap. By the way, this resin ring prevents the pressure load applied to the winding fixing part from concentrating on a part of the magnet. Thus, the stress is dispersed to prevent the magnet from breaking.

However, the rotor of the magnet generator using the resin ring has the drawback that there are many parts and many assembly steps. In addition, there is a drawback that the inner diameter of the magnet is reduced because the resin ring is pushed radially inward by the milia winding fixing part at the front end of the winding fixing part of the yoke. In addition, there is a drawback that the axial length of the yoke is as long as the thickness of the resin ring.

In view of the above drawbacks, as disclosed in Japanese Patent Laid-Open Nos. 61-280747 and 61-288759, it is proposed to bend the upper part of the cover mounted on the inner circumference of the yoke to support the magnet. have. However, in the former case, the open edge of the flange of the cover is free, which is insufficient to support the magnet. In addition, the latter is insufficient to fix-mount the magnet with elastic force because the magnet cannot be fixedly mounted to the yoke by the elastic force.

Accordingly, an object of the present invention is to provide a rotor of a magnet generator capable of reliably fixing a plurality of magnets to a yoke by a simple configuration.

According to the present invention, in a rotor of a magnet generator in which a plurality of magnets are arranged at regular intervals on an inner circumferential portion of a substantially cup-shaped yoke, and a cylindrical cover is fitted inside the magnet, the open end of the yoke An annular winding fixing part is formed in the outer circumferential part, and an inner circumferential part of the winding fixing part is formed in an annular step portion projecting slightly in the axial direction from the top of each magnet, and an upper flange is radiated from the top of each magnet on the upper part of the cover. It is formed to protrude outward, the front end portion of the upper flange extends to the vicinity of the inner circumferential portion of the winding fixing part of the yoke, a stepped portion is formed in the middle portion of the upper flange is bent toward the open end of the yoke from the top of each magnet, The winding fixing part of the yoke is bent radially inward so that the front end of the upper flange is half of the yoke. Pressed in the inward direction, and by this pressing the bent portion between the front end portion and the step portion of the upper flange of the rotor magnetic generator, it characterized in that the upper flange of the base end portion pressed against the top of the magnet is provided.

According to the rotor of the magnet generator of the present invention described above, when the winding fixing portion of the yoke is bent radially inward, the front end of the upper flange is pressed radially inward by the inner circumference of the winding fixing portion, The portion between the front end of the flange and the step is bent. When bent in this way, the upper flange functions as an elastic body. The base end of the upper flange pushes the upper portion of each magnet by the elastic force of the elastic body to support the magnet. Therefore, the magnet can be reliably fixed to the yoke without being pushed in the circumferential direction.

In the present invention, the magnet gripping means for gripping each of the plurality of magnets can be provided in the yoke.

The magnet gripping means is formed as a case inserted into the yoke so as not to be rotated. The case has a plurality of magnet accommodation chambers separated from each other by partition walls, and each magnet accommodation chamber accommodates one magnet.

The storage chamber is open at the top. On both sides of the partition wall in the circumferential direction, a plurality of pairs of gripping portions protrude from the tangential direction.

On the other hand, curved surfaces are formed on both side surfaces of each magnet. This curved surface presses the holding part by applying a pressing force to the holding part while the magnet is pressed into the upper chamber of its upper part.

The magnet gripping means is composed of a plurality of magnet gripping portions of the yoke that protrude inward at predetermined intervals so that each magnet is gripped between the side wall and the close wall of the yoke. The magnet gripping portion is located at a stepped portion formed between the side wall and the mill wall of the yoke.

An annular groove may be formed between the inner circumferential surface of the winding fixing part and the stepped portion of the inner circumferential surface yarn. This groove can prevent the magnet from being pushed inward in the radial direction when machining to fix the winding fixing part.

The lower end of the cover may have a structure in which an annular lower flange protruding in a radial direction is formed.

In order to better understand the present invention, it will be described with reference to the accompanying drawings.

The rotor of the magnet generator according to the embodiment of the present invention is composed of a yoke 11, a plurality of magnets 12, a case 13, and a cover 14.

The yoke 11 is integrally formed in a substantially cup form with the top open and the bottom closed by a magnetic material. A shaft hole 16 is formed in the center of the closed wall of the bottom surface, and extends so as to be directly connected to the engine through the boss portion (not shown). In addition, a plurality of mounting holes 17 are formed in the closing wall, and are arranged on the radially outer side of the shaft hole 16 to connect the rotor to the boss portion. A plurality of protrusions 18 are arranged on the radially outer side of the mounting hole 17, preventing the case 13 from rotating relative to the yoke 11. Each of the protrusions 10 is formed by the closing wall of the bottom surface of the yoke 11 protruding to the outer surface thereof. The mounting holes 17 and the projections 18 are arranged so as to be spaced apart from each other at any angle.

In the vicinity of the outer circumferential surface of the open end of the yoke 11, the wall thickness is reduced to form a winding fixing portion 19. Winding fixing portion 19 is formed by removing the inner circumferential surface of the yoke (11). Therefore, in the vicinity of the inner circumferential surface of the winding fixing portion 19, an annular step portion 19a is formed to protrude slightly in the axial direction from the top of each magnet 12. Between the step portion 19a of the winding fixing portion 19 and the inner circumferential surface, an annular groove 19b having a semicircular cross section is formed to extend in the circumferential direction of the yoke 14.

Each magnet 12 is integrally molded into a substantially rectangular parallelepiped whose height is smaller than the depth of the yoke 11. The magnet 12 has an arc shape curved along the inner circumferential surface of the yoke 11 in the width direction. In addition, the magnet 12 has an inner circumferential surface 20 (hereinafter abbreviated as front face) in which the inclined surfaces 22 and 22 are formed on the upper and lower ends, respectively, in an arc shape. The inclined surfaces 22 and 22 are gradually spaced farther from each other as the distance from the front surface 20 to the outward surface 21 (hereinafter abbreviated as back) becomes larger. A pair of upstanding side surfaces 23, 23 is formed to extend in a direction perpendicular to a tangent to a normal line passing through the centers of a plurality of partition walls described later. The upper surface 24 and the lower surface 25 are formed parallel to each other.

The case 13 is integrally molded with a nonmagnetic material such as a resin material having a moderate elastic force. In general, the case 13 is shaped into a cylindrical shape fitted to the yoke 11. A plurality of storage chambers 31 are formed in the cylindrical wall 30 of the case 13. The storage chambers 31 are arranged in the circumferential direction with substantially the same phase difference from each other. Each storage chamber 31 is formed of a hollow chamber whose height is equal to or less than the height of one magnet 12 and whose width is slightly larger than the width of the magnet 12. The upper wall, the rear wall and the front wall of the storage chamber 31 are as follows. The central part of is open. Therefore, the case 13 is formed in the shape which connected the some frame which the upper part was open to annularly. The bottom wall 32 of each storage chamber 31, ie the cross section of each upper open frame, is arranged in series to form a series of rings 33. A plurality of grooves 34 are formed on the bottom surface of the ring 33. The protrusion 18 of the yoke 11 is formed to fit in the groove 34.

A plurality of partition walls 35 corresponding to the longitudinal end pieces of the upper opening frame are formed between the adjacent storage chambers 31 and 31 of each pair. Each partition wall part 35 is formed so that it may stand in column shape of substantially H shape. The wall thickness of the partition wall part 35 is formed slightly smaller than the thickness corresponding to one magnet 12. A pair of gripping parts 36 are provided on both circumferential sides of the partition wall 35. The gripping portion 36 is formed to protrude substantially in a tangential direction, that is, perpendicular to the normal passing through the circumferential center of the partition wall 35. Each of the grips 36 is formed in a substantially triangular columnar shape having a triangular cone 36a with a tapered upper end.

The cover 14 is integrally formed by extrusion press processing using a magnetic metal material such as a thin iron plate. In general, the cover 14 is formed in a cylindrical shape that fits within the case 13 as a whole. Before assembling, the lower flange 42 is formed at the bottom of the cylindrical portion 41 of the cover 14. The lower flange 42 is formed in an annular ring shape extending radially inward from the cylindrical portion 41. An upper flange 43 is formed at the upper end of the cylindrical portion 41. The upper flange 43 is formed in an annular ring shape protruding radially outward from the cylindrical portion 41.

In the upper flange 43 of the cover 14, a step 44 is disposed at a substantially central portion in the radial direction. The upper flange 43 itself is formed in a bent shape by press working, and the step portion 44 is formed in an annular ring shape so as to continue in the circumferential direction. The upper flange 43 is integrally formed in the rear bent shape in which the inner horizontal portion 43a in the radial direction and the outer horizontal portion 43b in the radial direction are connected to each other by the step portion 44 extending at right angles thereto. do. The upper flange 43 is formed such that the radially outer end portion of the radially inner horizontal portion 43b extends to the vicinity of the radially inner circumferential surface of the winding fixing portion 19 of the yoke 11.

The rotor assembly operation of the magnet generator by each component related to the above-described configuration will be described, and the configuration of the rotor of the magnet generator will be described.

First, when the case 13 is fitted to the yoke 11, the protrusions 18 protruding from the bottom wall of the yoke 11 are fitted into the grooves 34 of the bottom of the case 13, respectively. The protrusion 18 is fitted into the recess 34 to prevent the case 13 from rotating together with the yoke 11.

Subsequently, the magnets 12 are each press-fitted into the storage chamber 31 of the case 13. At this time, a curved surface having a curvature of 30 ° to 50 ° is formed on the side surface 23 of the magnet 12 that is brought into contact with the corresponding grip portion 36 of the case 13, so that the magnet 12 is broken. It is pressed strongly into the accommodation chamber 31 so that the branch 36 can be compressed without detachment. When the magnet 12 is strongly pressed into the storage chamber 3, as shown in FIG. 6, the gripping portion 36 protruding from the side of the partition wall 35 is pressed against the side of the magnet 12. Pressurized as strongly as possible. This crimped state is a state in which the grip portion 36 is deformed with respect to the magnet 12 and is strongly received. Therefore, the magnet 12 is gripped in the storage chamber 31 by both holding parts 36 and 36. At this time, each grip portion 36 protrudes in a tangential direction with respect to the partition wall portion 35, and the side surface of the magnet 12 extends substantially parallel to the normal line, that is, substantially perpendicular to the corresponding grip portion 36. Therefore, the force F 3 of the pressing forces F ₁ and F 2 acting on the magnet 12 from both grip portions 36 and 36 presses the magnet 12 radially outward. Accordingly, the rear face 21 of the magnet 12 is strongly pressed against the inner circumferential surface of the yoke 11 by the force F 3, so that the magnet 12 is mechanically fixed to the yoke 11.

In this connection, the reaction force of the pressing force F₁ (or F2) acting on each of the holding parts 36 is transferred from the partition 35 to the holding part 36 opposite to the position where the former holding part 36 protrudes. It is equal to the working pressure F2. That is, the magnets 12, the partition 35, and the grippers 36 arranged in an annular shape with each other are pressed against each other along the inner circumferential surface of the yoke 11.

Thereafter, as shown in FIG. 4, the cover 14 is press-fitted in the radially inner side of the stack of magnets 12 that is fixed and helically aligned in each of the housing chambers 31 of the case 13. The cover 14 is formed in a cylindrical shape having an outer diameter approximately equal to the diameter of the circular inner circumferential surface formed by the magnet 12 stacking portion.

Since the flanges 42 and 43 are formed at the upper and lower ends of the cover 14 when press-fitting, even if the cover 14 is made of a thin steel plate, the cylindrical portion 41 of the cover 14 has sufficient strength. It is fixed. Accordingly, the cover 14 is smoothly press-fitted into the case 11, and the outer circumferential surface of the cylindrical portion 41 of the cover 14 is in uniform contact with the entire inner circumferential surface of the case 14 as a whole. In addition, when press-fitting, a jig for receiving a push force acting on the cover 14 or a reaction force opposite thereto may be attached to the flanges 42 and 43. Therefore, the pressing force can be applied uniformly to the entire cover 14, and more precise indentation is achieved. After indentation, as shown in FIG. 4, the lower flange 42 of the cover 14 protrudes axially downward and bends radially inward. In this way, the lower flange 42 enters into the lower end of each magnet 12. As a result, since the inner diameter of the lower flange 43 after the press-fit becomes the same as other parts of the cover 14, other parts can be fitted in the cover 14 in a subsequent step.

Then, as shown in FIG. 3, when the winding fixing portion 19 of the yoke 11 is wound and fixed inward in the radial direction, the winding fixing portion 19 is positioned near the annular groove 16b as a point. Bends radially inward. Accordingly, the horizontal portion 43b of the radially outer side of the upper flange 43 has the winding fixing portion 45 and the step portion 19a in a state where the front end portion thereof is pressed axially downward by the inner circumferential surface of the winding fixing portion 19. It is fixed between the top of the. When the vicinity of the outer circumferential end of the upper flange 43 is pressed downward in the axial direction by the winding fixing part 45, the portion between the radially outer circumferential end of the upper flange 43 and the stepped portion 44 is bent to elastically deformed portion. To form 43c. In this way, the elastic force is stored in the upper flange 43. By the elastic force of the elastic deformation portion 43, the radially inner horizontal portion 43a adjacent to the base end of the upper flange 43 presses the upper surface 24 of each magnet 12. Due to this pressing force by the upper flange 43 of the cover 14, the magnet 12 is axially pressed downward, so that the magnet 12 can be reliably prevented from escaping from the inside of the yoke 11. have.

As described above, according to the present embodiment, the magnet 12 can be reliably installed in the yoke 11 without using a resin ring. Therefore, the number of assembly steps and the number of parts can be reduced, and manufacturing cost is saved. In addition, it can be made because a retaining ring made of a resin material is unnecessary.

Furthermore, since the annular groove 19b is formed in the winding fixing portion 19, the stress at the time of winding fixing the winding fixing portion 19 does not act on the magnet 12. Accordingly, the magnet 12 is prevented from being pushed inward in the radial direction by the winding fixing process of winding fixing unit 19, so that a product in which dimensional accuracy is recognized can be provided. In addition, since the diameter of the winding fixing portion 19 is the same as the diameter of the contact portion of the yoke 11 in contact with the magnet 12, the unnecessary diameter of the yoke 11 can be reduced to improve waste of material.

In addition, the present invention is not limited to the above embodiment. Various changes may be made without departing from the spirit of the invention.

For example, instead of winding the lower flange 42 into the lower side of the magnet 12, spot welds or rivets may be used to secure the tight walls of the flange 42 and the yoke 11 to each other.

Positioning the magnet 12 in the axial direction is not limited to using the case 13. As shown in FIG. 7, the side wall of the yoke 11 cuts the inner circumferential surface to form a plurality of seats or magnet gripping grooves 46 at predetermined intervals, and the magnet 12. It may be configured to be in contact with the side wall surface of the magnet gripping groove 46.

As shown in FIG. 8, the magnet gripping protrusion 48 is formed from a step portion 47 formed below the inner side wall of the yoke 11 or in an area between the side wall and the bottom wall of the yoke 11. Can be configured to hold the magnet 12 in a circumferential direction by the magnet gripping protrusion 48. The magnet gripping protrusion 48 may be formed such that the corner portion of the outer circumferential surface of the yoke 11 is protruded from the lower side and protrudes upward from the upper side of the groove 49 formed by the protrusion processing.

As described above, the rotor of the magnet generator according to the present invention, a stepped portion is formed in the upper flange of the cover, the winding fixing portion is formed in the outer peripheral portion near the open end of the yoke, the winding fixing portion is bent inward in the radial direction The upper flange is pressed and the elastic deformation portion is formed in the upper flange by the pressing, thereby preventing the magnet from moving in the axial direction by the elastic force of the elastic deformation portion. Therefore, the magnet is securely installed in the yoke, and the manufacturing cost is saved because the work steps and the number of parts are reduced.

Claims (11)

In a rotor of a magnet generator in which a plurality of magnets are arranged at regular intervals on the inner circumferential portion of the approximately cup-shaped yoke, and a cylindrical cover is fitted inside the magnet, the annular portion is annular on the outer circumference of the open end of the yoke. A winding fixing portion of the winding fixing portion is formed, and an annular step portion is formed in the inner circumference of the winding fixing portion, in which each magnet is slightly axially axially rotated from the top, and an upper flange is radially outwardly from the top of each magnet on the upper portion of the cover. It is formed to protrude, the front end of the upper flange extends near the inner circumferential portion of the winding fixing part of the yoke, the middle portion of the upper flange is formed so as to bend toward the open end of the yoke from the top of each magnet, Winding fixing part of the shaft bends radially inward so that the front end of the upper flange is pressed radially inward of the yoke And, by the pressing, the portion between the front end portion and the step portion of the upper flange is bent so that the base end portion of the upper flange is pressed against the upper portion of the magnet. The rotor of claim 1, wherein magnet holding means for holding each of the plurality of magnets is disposed in a yoke. The magnet gripping means is composed of a case inserted into the yoke so as not to rotate, and the case is divided by partition walls and has a plurality of storage chambers for one magnet. Rotor of magnet generator. 4. The rotor of claim 3, wherein an upper portion of each of the storage chambers is open, and a plurality of pairs of grip portions are formed to protrude substantially in a tangential direction on both side surfaces of the partition wall in the circumferential direction. 5. The curved surface of claim 4, wherein curved surfaces are formed on both side surfaces of the magnets, and the curved surfaces apply a pressing force to the gripping portion of the partition wall while the magnet is pushed into the accommodation chamber toward the open end of the storage chamber. Rotor of the magnet generator, characterized in that the compression The rotor of claim 5, wherein the curved surface has a curvature of approximately 30 ° to 50 °. 3. The rotor of a magnet generator according to claim 2, wherein the malleable magnet gripping means comprises a plurality of magnet gripping portions projecting inwardly at predetermined intervals so that each magnet is gripped at the bottom of the inner wall of the yoke itself. 8. The rotor of claim 7, wherein the magnet gripping portion is located at a stepped portion formed between the side wall and the bottom wall of the yoke. 3. The rotor of the magnet generator as claimed in claim 2, wherein the magnet gripping means comprises a plurality of magnet gripping grooves formed by cutting at predetermined intervals on the inner wall of the yoke itself. The rotor of a magnet generator according to claim 1, wherein an annular groove is formed between the inner circumferential surface of the winding fixing part and the step portion on the inner circumferential surface. The rotor of claim 1, wherein an annular lower flange protrudes radially inward from a lower end of the cover.

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