JPS5922785Y2 - magnet generator rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotor for a magnet generator, and more particularly to an improvement in the magnet fixing structure thereof.

Conventionally, various types of magnet fixing structures in the rotor of magnet generators have been known, but those using ferrite magnets are particularly fragile, so a magnet case is needed to protect the magnets. The structure used has been awarded.

A typical example is Utility Model No. 48-r 1011
This is disclosed in Japanese Patent Laid-open No. 04 or Japanese Patent Laid-Open No. 48-9602.

However, in these known rotors, although the ferrite magnets are housed in multiple magnet cases to protect them, each magnetic pole piece is fastened to the iron fence with two screws, and this Each magnet case was fixed to the iron fence together with the ferrite magnet.

For this reason, the above-mentioned known rotor has the disadvantage that managing the tightening torque of the screws used for each magnet case is complicated, and that a time-consuming screw tightening process is required when assembling the two. Ta.

Moreover, the overall number of parts is large and expensive, and as a result of complicated assembly work, it is difficult to automate the assembly, which also makes the assembly expensive.

Therefore, in the present invention, a wedge insertion part is provided between adjacent magnet insertion parts in a magnet case that has a magnet insertion part into which a magnet is inserted, and a wedge is driven into this wedge insertion part. The object of this invention is to solve the above-mentioned conventional drawbacks by bulging the wedge insertion part of the case and press-fixing the magnet housed in the magnet insertion part to the inner periphery of the iron fence.

In addition, the present invention provides magnet holding pieces at both ends of the magnet insertion portion of the magnet case, which have elasticity to abut against the end face of the magnet and clamp the magnet, so that the magnet can be securely fixed even when the magnet width changes. The aim is to do something in order to obtain something.

The attached drawing shows an embodiment of the present invention, in which 1 is a bowl-shaped iron fence formed by press-drawing a magnetic plate such as an iron plate, and 2 is a bowl-shaped iron fence fixed to the inner periphery of this iron fence 1. There are multiple (four in the figure) magnets.

As each magnet 2, an arc-shaped ferrite magnet magnetized in the radial direction is used.

Reference numeral 3 denotes a magnetic pole piece formed by pressing a magnetic plate such as an iron plate into an arc shape that coincides with the inner circumferential surface of each magnet 2, and is arranged on the inner circumference of each magnet 2 in contact with this.

A contact surface 3a bent diagonally outward is provided at both ends in the circumferential direction of each magnetic pole piece 3.

Each contact surface 3a comes into contact with a columnar part of a magnet case, which will be described later, and is pressed by the columnar part.In order to ensure a sufficient pressing area, each contact surface 3a should be spread over the entire axial width of each magnetic pole piece 3. However, in order to make maximum use of the energy of the magnet 2, it is preferable to provide it only in a part of the axial width of each magnetic pole piece 3 as shown in FIG. 8, which reduces magnetic leakage. It is possible to extract a large generator output.

In addition to the formation of the contact surface 3a of the magnetic pole piece 3, chamfered portions are formed at the corresponding corners of the magnet 2.

Reference numeral 4 denotes a magnet case made of a non-magnetic material such as aluminum or synthetic resin, which includes a ring-shaped bottom 5 and a plurality of (four in the figure) erected on this bottom 5 at equal intervals in the circumferential direction. It has a dovetail columnar part 6.

This magnet case 4 is arranged inside the iron fence 1 along the inner periphery of the iron fence 1, and more specifically, the bottom surface of the bottom part 5 is in contact with the bottom inner surface of the iron fence 1, and the outer periphery of each columnar part 6 is in contact with the bottom inner surface of the iron fence 1. It is disposed within the iron fence 1 in contact with the inner periphery.

The spaces between adjacent columnar parts 6 of the magnet case 4 each constitute a magnet insertion part 7, and the magnet 2 and the magnetic pole piece 3 are inserted into each magnet insertion part 7.

The circumferential width 11 of each magnet insertion portion 7 is formed to be larger than the circumferential width of the magnet 2 .

With the magnet 2 and the magnetic pole piece 3 inserted into each magnet insertion portion 7 , the lower end surface in the axial direction on the side of the magnet 2 and the magnetic pole piece 3 is in contact with the surface of the bottom 5 of the magnet case 4 .

Moreover, it abuts on either the sloped surfaces (contact surfaces) 6a formed on both sides of each dovetail columnar section 6 of the magnet case 4 or the abutment surfaces 3a of the corresponding magnetic pole pieces 3 from the inside.

As a result of (2), each magnetic pole piece 3 and each magnet 2 are positioned so that they do not move inwardly in the radial direction of the iron fence 1 by the abutting surfaces 6a of each columnar portion 6.

Magnet holding pieces 8 are integrally provided on both sides of each columnar part 6 of the magnet case 4, respectively, protruding outward in the circumferential direction (into the magnet insertion part) from the upper end thereof and further extending obliquely downward toward the bottom part 5. ing.

Each presser piece 8 is configured to have elasticity at the connecting portion with the columnar portion, and can be bent in a direction approaching the corresponding columnar portion 6.

When each presser piece 8 is in the free state, the circumferential width between the presser pieces provided on the facing sides of the adjacent columnar parts 6 is such that the minimum width 12 between their lower ends is the circumferential width of the magnet 2. smaller,
The maximum width 13 between the upper ends is selected to be larger than the circumferential width of the magnet 2.

Therefore, when the magnet 2 is inserted into the magnet insertion portion 7, each presser piece 8 is bent by the circumferential end surface of the magnet 2 and comes into contact with the magnet end surface.

In other words, each magnet 2 has a holding piece 8 that comes into contact with both ends in the circumferential direction.
It is held between.

A wedge insertion portion 9 having a triangular cross section is formed in each columnar portion 6 of the magnet case 4.

This wedge insertion part 9 opens at the upper end of each columnar part 6, extends to the lower end, and is also opened here.

A vertical groove 9a penetrating the wedge insertion portion 9 is formed on the inner peripheral surface of each columnar portion 6.
is formed over the entire area from the upper end to the lower end of the columnar portion 6, and the vertical groove 9a allows the portions on both sides of the vertical groove 9a, that is, the portions having the contact surfaces 6a, to be easily bent.

The height of each columnar portion 6 is formed to be the same as the axial height of the magnet 2, and the upper end surface of each columnar portion 6 coincides with one end surface of the magnet 2.

10 is a wedge ring made of a non-magnetic material such as aluminum or synthetic resin, and includes a ring-shaped connecting portion 11 and this connecting portion 1
A plurality of wedges 1 having a triangular cross section are provided at equal intervals in the circumferential direction.
It has 2.

The number of wedges 12 matches the number of wedge insertion portions 9 described above.

In this wedge ring 10, each head 12 is inserted (driven) into each wedge insertion part 9 of the magnet case 6, and the connecting part 11 or the magnet 2
, the magnetic pole pieces 3 and the columnar parts 8 of the magnet case 6, respectively, are attached to the magnet case 6 so as to cover one end surface thereof.

The tip of each tube 12 is formed into a small tapered shape to facilitate insertion into the wedge insertion portion 9.

Furthermore, the circumferential width L' of each groove 12 is formed to be larger than the circumferential width L' of the wedge insertion portion 9 in the free state.

Therefore, by inserting each shaft 12 into the wedge insertion part 9, the columnar part 6 of the magnet case 4 is bulged out, and the contact surface 6a or the contact surface 3a of the magnetic pole piece 3 is directed toward the inner peripheral surface of the iron fence 1. It is designed to be pressed.

A ring-shaped groove 13 surrounding the entire circumference is provided at the upper end of the inner peripheral surface of the iron fence 1.

This groove 13 is for filling with adhesive.

Further, on the surface of the bottom 5 of the magnet case 4, three radial grooves 14 are formed for each magnet insertion portion 7, which are open on the outer diameter side of the bottom 5 and not open on the inner diameter side. , and a circumferential groove 15 connecting these on the inner diameter side.

These grooves 14,15 are also for adhesive filling.

Note that various numbers and shapes of these grooves can be used.

Furthermore, a protrusion 16 is formed at the inner diameter end of the bottom 5 of the magnet case 4 to prevent the adhesive from leaking out.

The above magnet 2, magnetic pole piece 3, magnet case 4 and ring 10
In addition to using adhesive, the tongue piece 1a at the upper end of the iron fence 1 is
It is fixed to the inner periphery of the iron fence 1 by tightening it to the connecting part 11 of the wedge ring 10.

The rotor having the above configuration is assembled as follows.

That is, first, the magnet case 4 is inserted into the iron fence 1, and the magnet 2 and the magnetic pole piece 3 are inserted into each magnet insertion part 7 of the magnet case 4.

At this time, each holding piece 8 bends and clamps each magnet 2 from both ends in the circumferential direction.

Then, each ring 12 of the wedge ring 10 is inserted into each wedge insertion portion 9 of the magnet case 4.

Then, since the dimension l' of the wedge insertion part 9 of the magnet case 4 and the dimension L' of the wedge 12 have a relationship of L'>l',
When the wedge 12 is inserted into the wedge insertion part 9, both sides of the wedge insertion part of each columnar part 6 of the magnet case 4 overcome the elastic force and are pushed out to both sides of the vertical groove 9a.

Then, the contact surface 6a of each columnar part 6 is pressed against the contact surface 3a of the corresponding magnetic pole piece 3, and the magnetic pole piece 3 and magnet 2 are pressed against the iron plate 3.
Press it against the inner circumference of the

In this way, the magnet 2 is engaged with the magnet case 4 and the wedge 12.
It is firmly fixed to the iron bowl 1.

After that, in order to further strengthen the fixing, adhesive is dripped into the groove 13 of the iron fence 1 as needed.

Then, this adhesive is filled between the outer circumferential surface of the magnet 2 and the inner circumferential surface of the iron fence 1, and reaches the grooves 14 and 15 provided in the bottom part 5 of the magnet case 4, and from there, the magnetic pole piece 3 The space between the magnet 2 and the magnet 2 is also filled by capillary action.

In this way, the adhesive penetrates between the magnet case and the iron fence 1 and between the magnet 2 and the magnetic pole piece 3, so that the magnet 2 and the magnetic pole piece 3 can be bonded well to the iron fence 1 and the magnet case 4.

Finally, the tightening tongue piece 1a of the iron fence 1 is tightened to firmly fix the magnet case 4 and the wedge ring 10 to the iron fence 1.

In this way, according to the above structure, the magnet 2 and the magnetic pole piece 3 can be firmly fixed to the iron fence 1 by inserting the magnet 12 into the columnar part 6 of the magnet case 4 without using screws or the like.

Moreover, since each columnar part 6 has an elastic holding piece 8 and each magnet 2 is held between the holding pieces 8, even if there is a slight variation in the circumferential width of the magnet 2, the circumferential direction of the magnet 2 This prevents positional shift and ensures reliable fixation.

For example, the circumferential interval between the two presser pieces 8 located in each magnet insertion part 7 is at least 12, as shown in FIGS. 5 and 6.
When the maximum width is 13, if the magnet has a circumferential width within the range of 12 to 13, the holding piece 8 can securely hold the magnet.

In addition, in the above embodiment, the wedge ring 10 in which each ring 12 is integrated is used.
Although the insertion of each tube 12 can be carried out at the same time by using the present invention, even if each tube is made independent, sufficient operation and effect can still be obtained.

As explained above, according to the present invention, a magnet can be firmly fixed to an iron fence with the simple operation of inserting a wedge.

Insertion of the wedges can be automated, making it possible to assemble the rotor quickly, efficiently, and easily.

Further, according to the present invention, even if there is some variation in the dimensions of the magnet, it is possible to absorb this and securely fix the magnet.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional plan view showing one embodiment of the rotor according to the present invention, FIG. 2 is a cross-sectional view taken along line II--II in FIG. 1, FIG. The figure is a side view in the direction of arrow IV in Figure 3, Figure 5 is a plan view of the magnet case, and Figure 6 is a side view in the direction of arrow IV in Figure 3.
The figures are a VI-VI sectional view of FIG. 5, FIG. 7 is a perspective view of the wedge ring, and FIG. 8 is a perspective view showing a modified example of the magnetic pole piece. 1... Iron fence, 2... Magnet, 4...
...Magnet case, 7...Magnet insertion part, 8...
... Presser piece, 9 ... Insertion section, 12 ...
·wedge.

Claims (2)

[Scope of utility model registration request] (1) In a rotor of a magnet generator in which a plurality of arc-shaped magnets magnetized in the radial direction and each magnetic pole piece attached to the inner peripheral surface of each of these magnets are arranged on the inner periphery of an iron fence, the magnet a plurality of dovetail-shaped columnar parts arranged at both circumferential ends of the dovetail-shaped columnar parts; an arcuate magnet insertion part formed between the dovetail-shaped columnar parts into which the magnet and the magnetic pole piece are inserted; and each of the columnar parts. a ring-shaped magnet case having a wedge insertion portion having a triangular cross section and an opening in which a part of the wedge insertion portion is opened toward the inner circumference; ,
A plurality of wedges having a circumferential dimension larger than the circumferential dimension of the wedge insertion portion, and a plurality of wedges protruding toward the magnet insertion portion on both sides of each dovetail columnar portion and abutting on both sides of the magnet in the circumferential direction. magnet holding pieces having elasticity that are in contact with each other and clamp the magnets from the circumferential direction, and when the respective magnets are inserted into the respective wedge insertion portions, the columnar portions are pushed out from the openings, and the respective magnets are A rotor for a magnet generator, in which the magnet is pressed against the iron fence via the magnetic pole piece by contact surfaces formed on both side surfaces of a columnar part. (2) A rotor for a magnet generator according to claim 1, wherein the respective schools are connected to each other in a ring shape at the open end side of the iron fence.