KR900003988B1 - Magneto d.c. motor - Google Patents

Abstract

On the inner periphery of the motor's yoke (2), four permanent magnets (4) are equally spaced apart but are not mechanically attached to the yoke itself. Instead, the magnets are securely held in position by spring retainers (3). Each retainer consists of a flat back surface of approx. the same axial length as the permanent magnet poles, with side members (12, 13) raised and spaced apart to give a strong interference fit between the radial side surfaces (71, 72) of the adjacent magnets. The ends of each side member are returned (32) to retain the magnets (4) agatnst movement in an axial direction. The four U-formed retainers are pressed out radially into the space between magnets and secured by plastic bonding to the yoke.

Description

Magnetic dc motor

1 is a front view of a stator when the present invention is applied to a magnetic direct current consisting only of permanent magnets as magnetic poles.

2 is a detailed explanatory view of the holding tool shown in FIG.

3 is a front view of the stator of the first embodiment in the case where the present invention is applied to a magnetic DC motor having a permanent magnet and an auxiliary pole as magnetic poles.

4 is a detailed explanatory view of the holding tool shown in FIG.

5 is a perspective view of the holder shown in FIG.

6 is a front view of a stator of a second embodiment in the case where the present invention is applied to a magnetic DC motor having a permanent magnet and an auxiliary pole as magnetic poles.

7 is a detailed explanatory view of the holder shown in FIG.

8 is a perspective view of the holder shown in FIG.

9 is a front view of a stator of a third embodiment in which the present invention is applied to a magnetic DC motor having a permanent magnet and an auxiliary pole as magnetic poles.

10 is a detailed explanatory view of the holder shown in FIG.

11 is a perspective view of the holder shown in FIG. 10;

12 is a view for explaining a method for fixing a holder to a yoke in the present invention.

The present invention relates to a magnetic direct current machine. In particular, in a structure for fixing a magnet to a yoke, the present invention relates to a stator for a magnetic direct current machine that can achieve its rigid fixing without the need for an adhesive.

Background Art Conventionally, a magnetic generator has been proposed in which a magnet is fixed to a yoke by using an elastic body around a magnet.

As a magnetic generator of this kind, there is, for example, Japanese Patent Application Laid-Open No. 57-16561, "Rotor of a Magnetic Generator," which was released in Japan on January 28, 1982.

In the magnetic generator disclosed in Japanese Patent Application Laid-Open No. 57-16561, the magnet is fixed to the yoke by simply pressing the magnet from the inner circumference to the outer circumference by the holding tool, as is apparent from the description of the claims. There is a problem in the resistance to vibration because the fixing strength against is not necessarily sufficient.

It is also known in the art for a magnet DC motor to fix the magnet to the yoke by inserting an elastic body in the gap between the magnet and the magnet. As a magnetic DC motor of this type, there is, for example, Japanese Patent Application Laid-Open No. 50-113707 "Electric Motor" disclosed in Japan on September 6, 1975.

The magnetic DC device disclosed in Japanese Patent Application Laid-Open No. 50-113707 supports the magnet by an arm installed in the holding tool as is apparent from the description of the claims. there was.

An object of the present invention is to provide a magnetic DC motor that is excellent in the holding strength of the yoke and the magnet, and can withstand the vibration sufficiently in strength.

In the stator formed by arranging a plurality of permanent magnets on the inner circumference of the yoke in order to achieve the above object, the present invention is made of an elastic body and at the same time fixed to the yoke in the interval between the permanent magnets and holding the holding tool having two axial support The magnet is held in close contact with the magnet in three directions of each side surface of the magnet adjacent to each side and side of the magnet, as will be apparent from the following description of the permanent magnet by the two supporting portions extending in the central axis direction of the DC motor of the holder. It is pressed and clamped, and the structure which fixes a permanent magnet to a yoke is taken.

According to the present invention, since the permanent magnet is pressed and sandwiched in three directions by the above-mentioned method by the elastic body fixed to the yoke, the initial object of the present invention can be easily achieved.

In FIG. 1, the stator 1 has the some permanent magnet 4 arrange | positioned at the inner periphery of the cylindrical yoke 2. As shown in FIG. Inside the stator 1, the rotor 10 which rotates the periphery of the center axis | shaft 0 of the stator 1 by a woman is provided.

The plurality of permanent magnets 4 are arranged at intervals 9 on the inner circumference of the yoke 2.

The method of fixing the permanent magnet to the yoke 2 is as described with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, the one surface 11 of the cross-section “c” shaped holder 3 made of an elastic body is fixed to the yoke 2. I'm making it.

The holding tool 3 is provided with first and second supporting portions 3a and 3b extending in the direction of the central axis 0, and the permanent magnets 4 are sandwiched by the supporting portions. It is elastically supported and fixed by the holder (3) made of an elastic body.

The supporting parts 3a, 3b are two surfaces 12, 13 extending in the direction of the central axis of the direct current machine along side surfaces 71, 72 on the magnets 4 facing each other at a spacing 9 therebetween. And an elastic part 32 made of an elastic body disposed along the end surfaces 81 and 82 of the permanent magnet 4 extending in the direction of the central axis of the DC motor.

The permanent magnets 4 are elastically supported by the two surfaces 12 and 13 and the elastic portion 32.

The elastic portions 32 of the supporting portions 3a and 3b are formed at approximately both ends of the elastic portion 32, and the two elastic portions 32 face each other at intervals on the inner circumference of the yoke. The end faces 81 and 82 of the magnet adjacent to the side surfaces 71 and 72 of the permanent magnet are narrowed and held.

Thus, according to the present invention, the supporting portions 3a and 3b are end faces of the magnets adjacent to the side surfaces 71 and 72 and the longitudinal side surfaces 71 and 72 of the permanent magnet 4 in the respective longitudinal directions. While contacting the permanent magnet 4 from three directions of (81) and (82), the permanent magnet 4 is pressed and pinched to fix the permanent magnet to the yoke 2.

In Fig. 12, the holder 3 having a hole 33 in the inner circumference of the cylindrical yoke 2 is set on the mold 61, and then the plurality of holes 33 formed in the holder 3 are formed. By pressing the press 7 at the outer periphery of the yoke 2, the yoke member is filled in the hole 33 of the holder 3, and the yoke 2 and the holder 3 are fixed by plastic bonding. In this way, since the holding tool 3 is fixed to the yoke 2 by plastic bonding, the holding strength of the magnet is further improved.

In FIG. 3, FIG. 4, and FIG. 5, the structure which fixes the permanent magnet 4 and the auxiliary electrode 5 to the yoke 2 is as follows. That is, while holding the yoke 2 of the cross-section " c " shaped retainer 3 made of an elastic body as shown in FIGS. 4 and 5, the support 3 extends in the central axis direction. (3a) and (3b) are formed, the permanent magnet 4 is clamped to the 1st support part 3a, and the auxiliary electrode 5 is clamped to the 2nd support part 3b, and thereby these whole It is elastically retained and fixed with a retainer (3) made of an elastic body. The holder 3 can be fixed to the yoke 2 by the method shown in FIG. 1, FIG.

The support parts 3a and 3b are provided to hold the permanent magnets 4 and the auxiliary electrodes 5 in the axial direction, that is, the direction perpendicular to the ground of Fig. 3, and in the left and right directions in Figs. 4 and 5, respectively. It is formed by stretching. In the present example, the first supporting portion 3a holding the permanent magnet 4 is an S-shaped elastic portion 32 at both ends thereof, and the permanent magnet 4 is squeezed by both elastic portions 32. It is structure to hold. On the other hand, in the second support portion 3b holding the auxiliary electrode 5, the one end portion is made of an approximately S-shaped elastic portion 34, but at one position at the other end, the fitting click 31 is disposed. In other words, the auxiliary electrode is narrowed and held between the elastic portion 34 and the click 31.

At the time of mounting, the permanent magnet 4 is inserted and held in the circumferential direction on the first supporting portion 3a. That is, the part 3c between the 1st support part 3a and the 2nd support part 3b shown in FIG. 3, ie, the part which can be inserted without interruption to the support parts 3a and 3b. The permanent magnet 4 is placed in the 3c, and then the permanent magnet 4 is inserted in the supporting portion 3a by moving in the circumferential direction as shown by the arrow 3d, and both elastic portions (3) of the supporting portion 3a are placed. 32) to hold the permanent magnet. Next, the auxiliary electrode 5 made of soft iron is inserted in the direction of the arrow 3e in FIG. 4, that is, in the direction from the rear surface of the ground in FIG. 3 to the ground. In this way, the auxiliary electrode 5 is inserted while pressing the click 31 to flatten it. When the rear end 51 of the auxiliary electrode 5 passes the click 31, the click 31 occurs, and this rear end ( 51, as shown in FIG. 4, the auxiliary electrode 5 is constricted between the elastic part 34 and the click 31 as a result.

The permanent magnet 4 is formed such that its axially extending side, that is, the axial side surface 4a, becomes a radial tangential surface at the center 0 of the yoke 2. That is, as shown in FIG. 3, the surface 4a becomes a surface substantially coinciding with the line in the center (0). Similarly, the auxiliary electrode 5 is formed so that the side surface 5a becomes a radial tangential surface. For this reason, both surfaces 4a and 5a come into contact with each other, and the holding tool 3 is also formed in a substantially "c" shape in advance, and is formed between the auxiliary electrode 5 and the permanent magnet 4. By pressing and bending this "c" shape, the permanent magnet 4 and the auxiliary electrode 5 can be crimped and fixed at this tension.

Thus, in this embodiment, the tension of the holder 3 is made permanent by forming the surfaces 5a and 4a in contact with the radial tangent toward the axial center in the auxiliary electrode 5 and the permanent magnet 4. (4) acts to effectively compress the inner circumference of the yoke (2).

In addition, the holder 3 is configured to insert the permanent magnet 4 from the circumferential direction as described above, and the auxiliary electrode 5 is press-inserted from the axial direction. As a result, the permanent magnet 4 is both elastic. The interposition between the sections 32 and the auxiliary electrode 5 is interposed between the click 31 and the elastic section 34, so that the attachment work is very easy. Moreover, after attachment, it is reliably maintained by an elastic force.

Put the spring plate of the object in a circle and insert it into the center space formed by the permanent magnet 4 and the auxiliary pole 5, and the leaf spring is brought into close contact with the inner circumference of the permanent magnet 4 and the auxiliary pole 5, It can also be set as the structure which does not protrude inward.

The holding tool 3 of this example was formed of the steel spring plate of steel. The leaf spring can also be formed by a spring steel sheet. And if there is such elasticity, elastic bodies other than a metal elastic body can also be used.

In this example, the clamping portion Ls of the holding tool 3 is set to be Lm > Ls with respect to the axial length dimension Lm of the permanent magnet 4 shown in Figs. , So that the permanent magnet (4) can be pinched by a sufficient pressure of the holding (3). Sufficient clamping pressure is also applied to the auxiliary pole 5 in the same manner.

As described above, according to this embodiment, the yoke 2 has the effect of ensuring the holding of the permanent magnet 4 and the auxiliary electrode 5 in a simple manner. In addition, since the holder 3 is mechanically fixed to the yoke 2, the roundness of the yoke becomes difficult to change, and the inner diameter of the permanent magnet 4 can be secured with high accuracy. That is, the stator 1 has a small and uniform gap between the armature and the armature. However, when the roundness of the stator 1 decreases, a large portion of the gap may occur, resulting in deterioration of performance. In the case of fixing by bonding, the magnet and yoke are expanded separately, so when the outer yoke side is stretched and fixed in that state during heating for bonding, the pole radius of the bonding part becomes large and the other part becomes small. Although the roundness was falling, there is no such concern in this structure.

In a structure in which a conventional magnet is bonded to a yoke, cracks were generated at a height of 30-40 cm in a test in which a pound of steel balls were dropped and a crack state was observed. In the present Example, the test of the thing of the same size showed no cracking to 70 cm. There was also a sample that reached 90 cm and had cracks as a ratio.

As described above, according to the present invention, since the permanent magnet and the auxiliary electrode are pressed and held in the inner circumference of the yoke by using a holding tool made of an elastic body, the assembling process is easy and the structure is simple, and the permanent magnet is not affected by thermal shock or impact. High reliability can be obtained by excellent holding force without breakage.

Next, an embodiment of the second invention will be described with reference to FIGS. 6 to 8.

In this configuration, the auxiliary electrode 5 is fixed to the inner circumference of the yoke 2. For example, the secondary electrode 5 is formed by cold forging integrally with the yoke 2 or fixed by welding or the like. The permanent magnet 4 is fixed to the yoke 2 and the auxiliary electrode 5 by a holder 6 made of an elastic body. That is, the permanent magnet 4 is placed adjacent to the auxiliary electrode 5, and the holder 6 is disposed between the permanent magnet 4 and the auxiliary electrode 5, so that the elastic force of the holder 6 is maintained. It is press-fixed and fixed.

At the time of mounting, the holder 6 made of an elastic body is placed in the state in which the axial side surface of the permanent magnet 4 is attached to the auxiliary electrode 5, that is, the permanent magnet 4 is placed at a predetermined position. It is inserted from the axial direction into the space between 5) and the permanent magnet 4, and stops the axial movement of the permanent magnet 4 to achieve fixing.

Also in this embodiment, as in the above example, the axial side surface of the permanent magnet 4 is a radial tangential surface at the center, and the auxiliary pole 5 also forms a radial tangential surface so that the surfaces are in contact with each other. . Since the holding tool 6 is formed in a substantially "c" shape in advance, the holding tool 6 is press-inserted while bending the "c" shape between the auxiliary electrode 5 and the permanent magnet 4 to hold the holding tool. The permanent magnet 4 can be crimped and fixed to the auxiliary electrode 5 by the tension of (6). As described above, since the surface of the auxiliary electrode 5 and the permanent magnets 4 are formed in radial contact with the axial center, the tension of the holder 6 causes the permanent magnets 4 to be in the yoke 2 inner circumference. Since it can act as a crimp, reliable fixing can be achieved.

The holding tool 6 attaches a taper 63 to the insertion side front end portion to facilitate insertion between the auxiliary electrode 5 and the permanent magnet 4. This facilitates the insertion work during mounting. In addition, in order to prevent the permanent magnet 4 from moving in the axial direction, a click 61a is formed on the side surface of the insertion shaft tip portion, and an approximately S-shaped press-elastic portion 62a is disposed at the other end portion. The click 61a was formed by cutting off the click as shown. As a result, the permanent magnet 4 is sandwiched between the pressing elastic part 62a and the click 61a.

Thus, the permanent magnet 4 is held by the elastic force by the press elastic part 62a of one end and the click 61a which latches this pressure of the other end. The click 61a of the same press-elastic portion 62b is also formed on the side where the auxiliary electrode 5 is sandwiched. With this configuration, first, the auxiliary electrode 5 fixed to the yoke 2 is sandwiched by the elastic force between the press-elastic portion 62b and the click 61b, thereby preventing the movement of the holder 6. Then, the pinning of the permanent magnet 4 can also be achieved to achieve attachment fixing that prevents the movement of the permanent magnet 4.

In this example, a part of the surface in contact with the auxiliary electrode 5 of the permanent magnet 4 serves as a notch 41 to facilitate insertion.

Unlike the embodiment described above, according to this embodiment, it is not necessary to arrange the projecting portion as indicated by reference numeral 21 in FIG. 3 in the yoke 2. Therefore, when forming such a protrusion, there is no fear that the roundness of the yoke 2 will change, and the inner diameter of the permanent magnet 4 can be ensured with high precision.

Also, in the present embodiment, the supporting part dimension Ls of the holder is set to be Lm > Ls with respect to the side length dimension Lm of the permanent magnet 4, so that it can be clamped with sufficient pressure when combined. Similarly, the dimension of the same relationship is also set also about the auxiliary electrode 5, and it clamps by sufficient pressure.

In Fig. 9, an elastic steel strip 8 slightly longer than the entire length of the inner circumference is placed in the inner circumference of the magnetic pole, and a pressure is placed on the inner circumferential side so as to protrude both ends to bend at intervals between the magnetic poles, thereby preventing movement of the magnetic pole.

In such a configuration, the axial side surfaces of the permanent magnet 4 and the auxiliary electrode 5 form a radial tangential surface 41 at the center so that the surfaces abut each other. In addition, the holding tool 3 is also formed in a substantially "c" shape in advance, and the pressure is arranged while bending the "c" shape between the permanent magnet 4 and the auxiliary electrode 5, so that the tension is maintained with the permanent magnet 4 and the like. The auxiliary electrode 5 is pressed and fixed to the yoke 2. This forms an radial tangential surface, which is effective in that the tension of the retainer pushes the magnetic pole in the yoke circumferential direction. In addition, when the width of the plurality of reinforcing ribs 34 arranged in the holder 3 is narrow due to the nonuniformity of the insertion dimension, the corner of the bent portion 42 of the holder 3 becomes a large curve R. It is provided for the purpose of preventing (3) from rising and protruding from the inner peripheral surface.

By arranging the reinforcing ribs in the circumferential direction in the holder, it can be prevented from protruding toward the inner circumferential side of the holder, and the accuracy of the inner diameter can be improved.

Claims (10)

Stator 1 having a plurality of permanent magnets 4 annularly arranged at intervals 9 between two adjacent magnets on the inner circumference of the cylindrical yoke 2, and the center of the stator 1 by a woman The rotor 10 rotating the shaft circumference and the yoke 2 are plastically deformed at a predetermined position, and a protrusion 21 protruding from the inner circumference thereof is inserted into the hole 33 of the holder 3 so that A surface 11 fixed to the inner circumference of the yoke 2 in the interval 9 and the permanent magnet 4 which is connected to the surface 11 and made of an elastic body and faces each other at the interval 9. Two surfaces 12 and 13 radially extending along the side surfaces 71 and 72 of the image, and an elastic body connected to each of the two surfaces 12 and 13, and an elastic cross section adjacent to the side surface. And a holding tool 3 composed of two elastic portions 32 extending along (81,82), wherein the two surfaces 12,13 ) And the two elastic portions 32 contact the magnet from three directions of the side surfaces 71 and 72 and the end surfaces 81 and 82 on the magnet, and simultaneously press and pinch the magnet. Magnetic DC motor, characterized in that for fixing the permanent magnet (4) to the yoke (2). 2. The first supporting portion 3a according to claim 1, wherein the auxiliary poles 5 are arranged along the inner circumferential surface of the yoke adjacent to each of the permanent magnets 4, and extend in the radial direction of the holder 3, respectively. The permanent magnet 4 is sandwiched by the second holding portion 3b, and the auxiliary electrode 5 is sandwiched by the second supporting portion 3b extending in the radial direction of the holder 3; Magnetic DC motor, characterized in that for fixing the permanent magnet (4) and the auxiliary electrode (5) to the yoke by the support of. The width Ls of each support part 3a, 3b is formed narrower than the side length Lm of the permanent magnet 4 with which each said support part clamps, and sufficient clamping force is made by this. Magnetic DC motor characterized by having. 3. The axial side surfaces of the permanent magnet 4 and the auxiliary electrode 5 are formed so as to be radial faces 4a, 5a from the central axis 0 of the yoke 2. And a magnet DC motor, characterized in that the side surfaces of the permanent magnet (4) and the auxiliary electrode (5) are in contact with each other. On the inner circumference of the cylindrical yoke (2) has a plurality of permanent magnets (4) arranged annularly at intervals between adjacent magnets, each of the permanent magnets (4) is a side extending in the axial direction of the DC motor (71) And a plurality of auxiliary poles 5 fixed on the inner circumference of the yoke 2 and disposed along each side surface of the permanent magnet 4, and by the excitation of the stator (72). The rotor 10 which rotates around the central axis of 1), the surface 11 fixed to the inner periphery of the yoke 2 in the said space | interval 9, and the center of the stator 1 simultaneously with an elastic body Two surfaces 12, 13 extending radially along the side poles 71, 72 of the auxiliary pole 5 and adjacent magnets 4 opposite to each other parallel to the axis 0 and at a distance 9. ), Elastic portions 62a and 62b connected to one end of the two surfaces 12 and 13 and extending along the end surfaces 81 and 82 of the auxiliary electrode 5 and the adjacent magnet 4, 2 Of radially extending surfaces of the elastic portions 62b connected to the other ends of the surfaces 12 and 13 and at one end of the surfaces 12 and 13 in which the magnet extends radially from the clicks 61a and 61b. A magnet DC motor comprising a plurality of holders (6) made of clicks (61a, 62b) to be inserted in parallel on one surface. 6. The holder (6) according to claim 5, wherein the auxiliary electrode (5) is formed integrally with the yoke (2), and the permanent magnet (4) is adjacent to the auxiliary electrode (5) and is made of an elastic body (6). Is disposed between the gap 9 between the permanent magnet 4 and the auxiliary electrode 5, and the permanent magnet 4 is fixed to the yoke 2 by the support of the holder 6. Magnetic DC motor characterized by. On the inner circumference of the cylindrical yoke (2) has a plurality of permanent magnets (4) arranged annularly at intervals between two adjacent magnets, the permanent magnet (4) is a side extending in the axial direction of the DC motor ( A stator 1 having 71, 72 and on the inner circumference of the yoke 2 and along the side of the permanent magnet 4, the side of the auxiliary electrode 5 being the side of the adjacent magnet 4. Plastic deformation of the plurality of auxiliary poles 5 arranged in planar contact with the rotor, the rotor 10 rotating the central axis of the stator 1 by the excitation, and the yoke 2 at a predetermined position. The protrusions 22 protruding from the inner circumference are inserted into the holes 33 of the holder 3, and the surface 11 fixed to the inner circumference of the yoke 2 in the gap 9 is provided with an elastic body. The auxiliary poles 5 and the adjacent magnets 4, which are simultaneously facing each other parallel to the central axis of the stator and at a distance 9. Cross sections of the auxiliary poles 5 and the adjacent magnets 4 are connected to two surfaces 12 and 13 radially extending along the side surfaces 71 and 72 and to end portions of the two surfaces 12 and 13. And a plurality of holders 3 formed of elastic portions extending along (81, 82), and contacting the yoke 2 by contacting the magnets 4 from the opposing side surfaces 72 and the end face 82. One radially extending surface 72 holding each magnet 4 and an elastic portion 32 at its end are formed to insert one of the magnets 4 from the circumferential direction of the yoke 2. So as to be sandwiched between the elastic part 32 in the stator 1 and the one radially extending surface 72, and the radially extending fixing the auxiliary electrode 5 to the yoke 2. The other side 71 of the two sides, which is formed in the elastic portion 32 and the other end thereof at one end thereof, and the click 31 at the other end thereof, and extends in the radial direction. The one auxiliary electrode 5 is inserted into the elastic part 32 from the click 31 at one end in a direction parallel to the other surface 71 extending in the radial direction so as to clamp the stator 1. Magnetic dc motor. 8. A magnet DC motor according to claim 7, characterized in that the permanent magnet (4) has an elastic strip (8) for pressing the permanent magnet (4) in the direction of the yoke (2) along its inner circumference. 8. The magnet DC motor as claimed in claim 7, wherein the holder (3) has a reinforcing rib (34) formed along the circumferential direction of the yoke on a surface in contact with the yoke (2). 8. The holder (3) according to claim 7, wherein the holder (3) has a hole (33) for fixing to the yoke (2), and the holder is placed on a mold (61) and then the hole (33) is yoke ( The yoke member is filled in the hole (33) by pressing by the press at the outer periphery of 2), and the retainer (3) is fixed to the yoke (2) by plastic coupling.

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