KR100267725B1 - Rotor in magnetic generator - Google Patents

Abstract

The magnet can be appropriately mounted on the yoke on which the retruder protrudes, avoiding the reduction of the inner diameter of the magnet group.

A plurality of arc-shaped magnets 20 are arranged on the inner surface of the yoke 11 at regular intervals, and a magnet including a recliner 13 which protrudes by a pressure outward in a radial direction to a part of the cylindrical cylindrical wall. In the rotor of the generator, the radius Ra at the circumferential center portion 22a of the outer circumferential surface of each magnet is set to be larger than the radius ra set by design in the inner circumference of the cylindrical wall of the yoke, and the circumferential opposite ends of the outer circumferential surface ( In 22b), the radius Rb is set smaller than the radius ra of the inner circumference of the yoke barrel wall.

In the case where the recliner protrudes from the yoke tube wall and the sphericity decreases in a direction such that the radius of the yoke inner circumference of the receptor and its peripheral portion is smaller than the radius of the yoke inner circumference of the portion, the center portion of the magnet outer peripheral surface ( Since 22a) is always in contact with the inner circumference of the yoke tube wall, it can be prevented that the magnet is inclined toward the center of the yoke tube wall.

In the state where a plurality of magnets are mounted in the yoke, the inner diameter of the magnet group can be avoided in advance, thereby eliminating the need to set a large air gap between the rotor and the generator.

Description

Rotor of magnet generator

1 is a partially enlarged plan view showing a relationship between a yoke and a magnet of a rotor of a magnet generator according to an embodiment of the present invention;

2 (a) and 2 (b) are each plan view for explaining the operation by the first diagram,

3 is a view showing a rotor of the magnet generator of an embodiment of the present invention,

3 (a) is a plan view,

FIG. 3 (b) is a front sectional view taken along the line b-b in FIG. 3 (a).

* Explanation of symbols for main parts of the drawings

11: York 12: wall

13: Reactor 14: closed wall

15: shaft ball 16: circular ball

17: slug 18: iron

18: screw insertion hole 20: magnet

21: inner circumference 22: outer circumference

22a: Central portion in circumferential direction 22b: Both ends in circumferential direction

23: inclined surface portion 24: side

25: upper surface 26: lower surface

30: cover 31: wall

32: outer flange portion 33: inner flange portion

34: fixing hole 35: cutout

36: whether or not rigidity 37: the first protrusion

38: second projection 39: pulsar

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet generator rotor, and in particular, to improve a fixed structure of a permanent magnet, for example, a rotor of a magnet generator mounted on a small vehicle or a special vehicle such as a motorcycle or a buggy. It relates to a technique for efficient use.

Generally, magnet generators using permanent magnets such as ferrite magnets (hereinafter referred to as 'magnets') are used in small or special vehicles such as motorcycles and barges.

This type of magnet generator includes a rotor in which a plurality of magnets are arranged and fixed at regular intervals on the inner circumference of the yoke, and a generator in which a coil is wound around a radial protrusion of the core. As it is driven and rotates around the generator, electromotive force is induced in the coils arranged at the poles of the generator.

Until now, the rotor of this type of magnet generator has a plurality of arc-shaped magnets arranged at regular intervals on the inner circumference of the cylindrical yoke, and the outer circumferential surface of the magnet is in contact with the inner circumferential surface of the yoke. It is structured. At this time, in order to ensure that the outer circumferential surface of the magnet is in close contact with the inner circumferential surface of the yoke, the radius of the outer circumferential surface of each magnet is made to be as same as possible within the design possible with the radius of the inner circumferential surface of the yoke.

Furthermore, in order to supply the ignition signal to the ignition device of the engine as a conventional rotor used in a magnet generator of this type, a reductor protrudes by pressure-embossing to a part of the cylindrical wall of the yoke in a radially outward direction. Formed ones have been used. Then, when the rotor rotates around the generator by driving the engine, a recliner protruding from the yoke passes through an ignition signal generator (pulsar) disposed close to the outside of the magnet generator rotor. Thus, the ignition signal generator is configured to generate an ignition signal and supply it to the ignition device of the engine.

However, it has been found by the present inventors that the rotor of the conventional magnet generator has the following problems.

From the viewpoint of the manufacturing efficiency of the rotor, the number of magnets is more advantageous to multimagnetizing magnets to at least one magnet. In addition, from the viewpoint of the output of the magnet generator and the effective use of the magnet, it is advantageous that the neutral part (the part where the magnetic force of the magnet does not occur) is short. In view of the foregoing, the circumferential length of each magnet is advantageously long.

On the other hand, when the yoke retractor is protruded by the embossing, the radius of the inner circumference of the yoke of the receptor and its peripheral portion is the yoke before the protruding, since the barrel wall of the receptacle is subjected to the pulling force in the protruding direction. It deforms in the direction smaller than the radius of an inner periphery, and the roundness of a yoke falls.

When the magnet having a long circumferential length is installed at the inner circumference of the receptacle portion and its peripheral portion of the yoke in which the spherical shape is reduced in this way, both ends of the magnet outer circumference come into contact with the inner circumference of the yoke so that the magnet is biased toward the center of the yoke. Therefore, the inner diameter dimension of the magnet group is partially reduced in the state where a plurality of magnets are mounted in the yoke.

As the inner diameter of the magnet group decreases, the rotor turning around the generator easily interferes with the generator. Therefore, in order to avoid such interference, the space between the generator and the rotor (hereinafter referred to as the 'air gap') should be set large in advance by design. However, when such an air gap becomes large, the output (power generation capability) of a magnet generator will fall.

SUMMARY OF THE INVENTION An object of the present invention is to solve the conventional problems as described above. A magnet capable of setting a generator and an air gap small by appropriately mounting a magnet on a yoke in which a reductor protrudes, without reducing the inner diameter of the magnet group. To provide the rotor of the generator.

According to the present invention, the rotor of the magnet generator is arranged in a cylindrical yoke inner circumference with a plurality of arc-shaped magnets, the outer circumferential surface is in contact with the inner circumferential surface of the yoke, the part of the tube wall of the yoke, the diameter of the reactor In the rotor of the magnet generator which protrudes outward in the direction, the radius at the circumferential center of each magnet outer circumference is set to be larger than the radius of the yoke inner circumference, and both ends of each magnet outer circumference are fixed by a certain distance from the inner circumference of the yoke. It is characterized in that it is set to be spaced apart.

By the above means, even if the yoke's spherical shape is reduced as described above, the magnet is biased toward the center of the yoke because the center part of each magnet outer circumference is approached by the state of contact with the inner circumference of the yoke. Can be avoided. Therefore, since the inner diameter of the magnet group in which the plurality of magnets are mounted in the yoke can be avoided, it is possible to avoid the occurrence of a situation in which the rotor interferes with the generator, and greatly increase the air gap between the rotor and the generator. There is no need to set it.

It will be described in detail with reference to the drawings.

1 is a partially enlarged plan view showing a relationship between a yoke and a magnet of a rotor of a magnet generator according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are respective plan views for explaining the effect of FIG. 3 is a view showing a rotor of the magnet generator according to an embodiment of the present invention. FIG. 3 (a) is a plan view and FIG. 3 (b) is a front sectional view taken along line bb of FIG. 3 (a).

In the embodiment of the present invention, the rotor of the magnet generator is provided with a yoke, a plurality of magnets, and a cylindrical magnet cover.

The yoke 11 is made of a magnetic material, has an open upper surface, is integrally formed in a closed cylindrical shape, has a predetermined width in the circumferential direction and the axial direction, and is provided on the pulsar 39. The opposed reluctor 13 protrudes by an embossing radially outward of the cylindrical cylindrical wall 12. In the lower surface blocking wall 14 of the yoke 11, a shaft hole 15 for inserting a boss that is fastened to the engine is formed at the center, and when the magnet is attached to the outer position of the shaft hole, A pair of round holes 16 used to attach the yoke positioning jig are drilled through a pair of concentric circles with a 180 degree phase difference. In the outer peripheral portion of the closing wall 14 of the yoke 11, a plurality of slots 17 (12 in this embodiment) for inserting the magnet positioning jig are provided at equal intervals in the circumferential direction on the concentric circles. have.

In the embodiment of the present invention, since the retractor 13 is protruded in the radial direction in a part of the cylindrical wall 12 of the yoke 11, the retractor 13 in the cylindrical wall 12 of the yoke 11 is formed. ) And its surrounding wall portion are subjected to a pulling force in the protruding direction such that the radius rb of the wall portion is smaller than the radius ra of the full circle.

Furthermore, the bottom surface of the closing wall 14 of the yoke 11 has a plurality of uneven parts 18 for fixing the cover 30 (eight in this embodiment), a group of circular holes 16 and a slot 17. It is arrange | positioned at equal intervals in the circumferential direction on concentric circles between groups, and it protrudes in the axial direction by pushing a part of the closed wall 14 from the outer surface, and this uneven part 18 is the cover 30 It is inserted into the fixing hole protruding from the structure and is configured to be joined.

In other words, a plurality of screw insertion holes 19 for attaching a cooling fan are formed in the closing wall 14 of the yoke 11 at equal intervals in the circumferential direction on the concentric circles of the group of circular holes 16.

The magnet 20 has a height equal to or less than the depth of the yoke 11, and is integrally formed in a substantially rectangular shape having an arc shape curved along the inner circumference of the yoke 11 in the width direction.

The left and right ends of the arc-shaped inner circumferential surface 21 of the magnet 20 are formed so as to approximate the outer circumferential surface 22 as the inclined surface portions 23 move toward the left and right ends. Side surfaces 24 and 24 of the rising portions on both sides are formed to be perpendicular to the tangent to the normal line passing through the center of the yoke 11, and the upper surface 25 and the lower surface 26 are parallel to each other. .

In an embodiment of the invention, the rotor of the magnetogenerator consists of using four magnets. As a result, the entire circumferential length L of the outer circumferential surface 22 of one magnet 20 is set to about one quarter of the inner circumferential length of the yoke cylinder wall 12, and is set relatively long. Therefore, it is advantageous from the viewpoint of manufacturing efficiency and effective efficiency of the magnet.

In this embodiment, the radius of curvature of the magnet 20 is set in advance in the circumferential direction of the curvature radius different in the center portion 22a and the end faces 22b and 22b. That is, the radius Ra in the circumferential center portion 22a of the outer circumferential surface 22 is set larger than the radius ra set in advance in the inner circumference of the cylindrical wall 12 of the yoke 11. In addition, the radius Rb in the circumferential end portions 22b and 22b of the outer circumferential surface 22 will be described as smaller than the radius ra set in advance at the inner circumference of the cylindrical wall 12 of the yoke 11. Here, the radius ra preset in the inner circumference of the yoke tube wall 12 corresponds to the radius ra when the yoke tube wall 12 is a full circle. In this connection, the circumferential length La between the circular arc drawn by the radius Ra of the circumferential center portion 22a and the two inner contacts of the circular arc drawn by the radius Rb of the both ends 22b of the outer circumferential surface 22a is the outer circumferential surface 22. Is set to about two-thirds of the total circumferential length (L).

The inner circumferential surface 21 of the magnet 20 is formed in a circular arc shape concentric with a circle defining the inner circumference of the cylindrical wall 12 of the yoke 11, and the radius Ra of this inner circumferential surface is It is set as small as the value which prescribed | regulated the thickness in the radial direction of the magnet 20 with respect to the radius ra of an inner periphery. In addition, since the magnet 20 is manufactured by being fired after being protruded and corrected according to the formation shape, the appearance of the magnet 20 can be freely set by setting the structure of the molded shape in advance.

The cover 30 is formed integrally by pressure processing using a metal material such as a thin steel plate, and is formed in a cylindrical shape that is press-fitted into the cylinder of the magnet group. At one end (hereinafter referred to as 'top') of the cylindrical wall 31 of the cover 30, the outer flange 32 is formed in a donut shape protruding outward in the radial direction.

In addition, the inner flange portion 33 is integrally molded into a circular donut shape at the lower end of the cylindrical wall 31 of the cover 30 before assembly. In the middle portion of the inner flange portion 33, the number of the fixing holes 34 is equal to the number of the uneven portions 18 of the yoke 11 (eight in this embodiment). It is established so that it may match with 18) group, and each fixing hole 34 is formed so that each uneven part 18 may be inserted, respectively.

Further, a plurality of cutouts 35 (eight in the present embodiment) are formed in the semicircular shape on the inner circumferential edge of the inner flange portion 33, and the group of cutouts 35 allows the yoke 11 to be formed. The circular hole 16 group and the screw hole 19 group can be avoided appropriately. Furthermore, the rigid edge part 36 is formed in the inner periphery of the inner flange part 33 in the shape of a curved line over the entire circumference including the cutout part 35. Its rigidity imparting portion 35 is shaped such that the inner circumferential edge portion of the inner flange portion 33 is bent inward in the axial direction at a predetermined height over the entire circumference by pulling-out processes, and is sufficiently rigid at the press-in of the cover 30. To be granted.

Next, the assembly operation of the rotor of the magnet generator by each component relating to the above configuration will be briefly described. First, a plurality of magnets (four in this embodiment) are arranged in a circular shape in the yoke 11 and the cover 30 is press-fitted.

Since the inner flange portion 33 and the rigidity portion 36 of the cover 30 are formed, the cover 30 is properly connected. In this connection state, the cover 30 has its inner flange portion 33 in contact with the bottom surface of the closing wall 14 of the yoke 11, and its outer flange portion 32 has an upper surface 25 of the magnet 20 group. ) Is in contact with In addition, when the cover 30 is inserted, a first protrusion 37 is formed between the magnet 20 groups, and positioning and rotational stop in the relative main direction of the magnet 20 group are made.

In addition, the cover 30 is press-fitted so that the outer circumferential surface of the cover 30 closely adheres to the inner circumferential surface 21 and the inclined surface portion 23 of the magnet 20, so that the magnet group 20 is compressed to the outside of the circle in the outer direction. As a result, the circumferential center portion 22a of the outer circumferential surface 22 of each magnet 20 is brought into contact with the inner circumferential surface of the yoke tube wall 12, thereby positioning the circle in the outward direction. In this state, the outer circumferential surface 22 of each magnet 20 is in a state close to the inner circumferential surface of the yoke tube wall 12 at the circumferential center portion 22a, and is defined by the inner diameter Rc of each magnet 22. The inner diameter of the cover 30 is concentric with the inner diameter ra of the yoke tube wall 12.

Subsequently, the protruding end of the uneven portion 18 of the yoke 11 inserted into the fixing hole 34 of the cover 30 is joined. Then, the cover 30 is fixed to the closed wall 14 of the yoke 11 in a circular shape by the entire uneven portion of the inner flange portion 33 by the group of the uneven portions 18 after such joining processing. In this state, positioning and rotational stop in the circumferential direction are made with respect to the yoke 11 of the magnet 20 group.

Next, a plasticizing tool (not shown) is inserted inside the cover 30, and the space between the yoke closing wall of the cylinder wall 31 of the cover 30 and the yoke closing wall side end portion of the magnet 30 is inserted. A second projection 38 is formed which protrudes outwardly or at least into the end surface side of the yoke closing surface of each magnet, and the axial positioning and fixing of the magnet 20 group is made. The firing tool is then pulled out from the inside of the cover. The rotor of the magnet generator shown in FIG. 3 is manufactured by the above process.

On the other hand, as shown in FIG. 2 (a), the radius of curvature R 'of the outer circumferential surface 22' of the magnet 20 'is preferably equal to the radius ra of the full circle of the yoke tube 12. As shown in FIG. In this conventional case, when the magnet 20 'is disposed on the inner circumference of the projecting yoke 11, the magnet 20' is largely deviated inward in the radial direction. That is, as shown in FIG. 2 (a), both ends of the outer circumferential surface 22 'of the magnet 20' are protruded and deformed from the tube wall 12 of the yoke, so that the inner diameter is the inner circumference of the portion having the small diameter rb. By contacting, the clearance gap G 'formed between the outer peripheral surface 22' of the magnet 20 'and the inner circumference of the cylindrical wall 12 of the yoke becomes large, and the magnet 20' becomes the cylindrical wall 12 of the yoke. ), The center is inclined as much as the amount tilted by the eccentric value E. In addition, the gap G 'formed between the outer circumferential surface 22' of the magnet 20 'and the inner circumference of the yoke tube 12 has a length as long as the entire circumferential length of the magnet 20' is longer. The protrusion deformation becomes larger as it becomes larger.

However, in the present embodiment, the arc-shaped outer circumferential surface 22 of the magnet 20 has a radius Ra at the circumferential center portion 22a than the radius ra set in advance at the inner circumference of the tube wall 12 of the yoke 11. Since the radius Rb is set smaller than the radius ra set at the inner circumference of the cylindrical wall 12 of the yoke 11 at the circumferential ends 22b and 22b, the yoke of this magnet protrudes and deforms. Even if disposed on the inner circumference of the cylindrical wall 12 in (11), the phenomenon in which the magnet 20 is shifted inward in the radial direction can be avoided. That is, as shown in FIG. 2 (b), the inner wall of the magnet outer circumferential surface 22 in contact with the inner circumference of the portion where the inner wall of the yoke 11 is projected and deformed to have a small diameter rb is shown. Since it is both ends of (22a), the clearance gap G formed between the magnet outer peripheral surface 22 and the inner circumference of the yoke cylindrical wall 12 becomes small, As a result, the magnet 20 is the center of the yoke cylindrical wall 12. There is little bias in the direction. The gap G formed between the outer circumferential surface 22 of the magnet and the inner circumference of the cylindrical wall 12 of the yoke has both ends of the central portion 22a even if the total circumferential length L of the magnet 20 is long. If it is the same, it is constant without increase and there is little influence on the fall degree of the sphericity of the cylindrical wall 12 of a yoke.

In the above embodiment, the following effects can be obtained.

(1) Rectifier protrudes from the yoke tube wall, and even if the sphericity decreases in the direction in which the radius of the yoke inner circumference of the receptor and the peripheral wall of the peripheral portion is smaller than the radius of the yoke inner circumference of the portion, the magnet outer circumferential surface Since the center portion of the tube is always in contact with the inner circumference of the yoke tube wall, the magnet can be prevented from being biased toward the center of the yoke tube wall.

(2) According to the above (1), it is possible to avoid the reduction in the inner diameter of the magnet group in the state where the plurality of magnets are mounted in the yoke. Therefore, there is no need to set a large air gap between the rotor and the generator.

(3) According to the above (2), the capacity of the generator can be set large, so that the rotor power generation capability of the magnet generator can be increased. In addition, since the air gap can be set small, the magnet generator can be reduced in size and weight.

(4) Even if a magnet having a long power circumferential length is closer to the state where the center of the magnet outer circumferential surface is in contact with the inner circumference of the yoke tube wall, the magnet can be prevented from being biased toward the center of the yoke tube wall. As a result, it is possible to use a magnet with a long power circumferential length, thereby increasing the manufacturing efficiency of the rotor of the magnet generator, and making the magnet as effective as possible by setting the neutral portion of the magnet small. At the same time, it is possible to improve the power generating capability of the magnet generator.

(5) While the engine is rotating, the wall of the yoke receives a centrifugal force acting on the magnet and is greatly skewed at the portions between the adjacent magnets, but its working point is compared with the conventional case in which both ends of the magnet were in contact with the yoke inner circumference. Since the distance of the yoke tube can be reduced, the change in the gap (air layer) between the pulsar and the reductor can be suppressed small.

As mentioned above, although the invention made by the present inventor was demonstrated concretely based on the Example, this invention is not limited to the said Example, It can be variously changed in the range which does not deviate from the summary, It is a mystery. For example, the radius at both ends in the circumferential direction of the magnet outer circumferential surface may be formed to be the same as the radius of the yoke inner circumference or may be formed in a straight line without being limited to being set smaller than the radius at the inner circumference of the yoke.

As described above, according to the present invention, the magnet can be properly attached to the yoke on which the retruder protrudes, avoiding the reduction of the background of the magnet group.

Claims (6)

The magnet generator is arranged in the cylindrical inner circumference with a plurality of arc-shaped magnets spaced apart from each other, the outer circumferential surface of the magnet is in contact with the inner circumferential surface of the yoke, and a part of the yoke tube wall has a retractor projecting outward in the radial direction. In the rotor, The radius of the circumferential center portion of each magnet outer circumference is set to be larger than the radius of the inner circumference of the yoke, and both ends of the magnet outer circumference are set to be spaced apart from the inner circumference of the yoke by a predetermined distance. The rotor of a magnet generator according to claim 1, wherein a radius at both ends of the outer circumference of each magnet is set smaller than a radius at the inner circumference of the yoke tube wall. 2. The circumferential length between the circumferential length between two circular arcs including a circular arc drawn by the radius of the circumferential center of the outer circumferential surface of each magnet and two circular arcs drawn by the radius of both ends of the outer circumferential surface is equal to the total circumferential length of the outer circumferential surface. Rotor of magnet generator, characterized in that set to about 2/3. The rotor of claim 1, wherein the number of magnets is four, and the total circumferential length of the outer circumferential surface of each of the magnets is set to about 1/4 of the inner circumferential length of the yoke tube wall. . The inner circumferential surface of each of the magnets is formed so as to provide a circle and an arc-shaped concentric axis defining an inner circumference of the yoke tube wall, and the radius of the inner circumferential surface of each magnet is compared with the inner circumferential radius of the yoke tube wall. The rotor of the magnet generator, characterized in that it is set smaller than the value limiting the thickness. The rotor of claim 1, wherein the magnetization of the multipole is partially applied to the magnet.