JPS6311887Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnet fixing structure for electrical equipment, and particularly to a structure for fixing magnets via a magnet case in a rotor of a magnet generator.

Conventionally, in order to easily and reliably fix magnets in the rotor of a magnet generator without using adhesives,
A method has been adopted in which a magnet is housed in a magnet case and the magnet case is fixed. For example, 1a
As shown in Fig. 1b, the magnet 2 is housed in a magnet case 3 formed in a rectangular frame structure, and a plurality of magnet cases 3 are placed around the entire inner circumference of the side part 1b of the housing 1, which is roughly bowl-shaped. The mouth edge of the housing is bent inward to form a curled part 1a, and this curled part 1a and the bottom part 1c of the housing 1 are
An idea regarding a rotor of a magnet generator that clamps and holds a magnet case 3 containing a magnet 2 has been proposed. Normally, in the above ideas, etc., the magnet case 3
is made of an elastic material such as synthetic resin, and has an internal storage space for the magnet 2 and the magnetic pole plate 4 so that the magnet 2 to be accommodated and the magnetic pole plate 4 fitted to the rotating shaft side can be easily set. It was formed slightly larger. For this reason, a slight gap 5 was created between the magnet 2 or the magnetic pole plate 4 and the inner surface of the magnet case 3, and in order to firmly fix the magnet 2, it was necessary to remove this gap 5 by some method. One method is to set the width W of the side portion 1b slightly smaller than the height H of the magnet case 3 to strengthen the clamping pressure on the horizontal frame 3 of the magnet case 3.
One possible method is to forcibly bend a.

However, in this case, since clamping pressure is applied to the vertical frame portion 3b of the magnet case 3 in the longitudinal axis direction, this portion is difficult to deform. Therefore, due to the work process, it is difficult to uniformly bend the entire circumference of the mouth edge of the housing 1 at the same time and fix the magnet case 3 with clamping pressure to eliminate the gap 5. After bending, special measures are required, such as re-clamping only the central portion of the magnet case 3 as shown by the broken line, or using a special clamping mold. However, the former method reduces work efficiency and makes it difficult to ensure the accuracy of the surface facing the stator coil surface, that is, the accuracy of the inner diameter of the rotor.The latter method requires expensive molds and maintenance. It is also disadvantageous in terms of

The present invention has been devised in view of the above points, and an object of the present invention is to provide a magnet fixing structure for electrical equipment that can firmly fix a magnet using a simple method. The present invention is characterized by a magnet fixing structure for electrical equipment in which a magnet is housed in a magnet case, and the magnet case is held under pressure on both upper and lower sides of a groove provided in the housing. It is formed into a frame shape, and the ends of the vertical frame parallel to the clamping direction of the rectangular frame are removed.

Next, specific embodiments of the present invention will be described based on the attached drawings. Fig. 2a shows an embodiment of the rotor of a magnet generator having a magnet fixing structure according to the present invention, and Fig. 2b is a front sectional view taken in the circumferential direction before forming a curled part and fixing the magnet. FIG. As shown in FIG. 2a, the magnet 2 has a generally rectangular shape, and its back surface has the same circumferential curved surface as shown in FIG. The front surface forms a circumferentially curved surface concentric with the back surface, with a radius that is shorter by the same thickness as the entire surface. The housing 1 typically constitutes the yoke of a magnet generator. The magnet 2 having such a shape is housed in a synthetic resin magnet case 3 formed in a rectangular frame structure. The housing space for the magnet 2 formed inside the magnet case 3 is formed to be slightly wider than the magnet 2 and the magnetic pole plate 4, as described above, and there is a gap 5 between the upper and lower parts thereof. Steps 6 are provided at both upper and lower ends of the vertical frame 3b of the magnet case 3. Therefore, the length of the vertical frame 3b is shorter than the height A of the central portion of the magnet case 3 by the vertical depth 2B of the two steps 6 above and below. In a preferred embodiment, the depth B of this step is set to be slightly deeper than the total width of the upper and lower spaces 5 combined. This is because in order to eliminate the gap 5, it is necessary to compress the height A of the magnet case 3 by at least the sum of the widths of each gap. Further, although a step is provided at both ends of the vertical frame 3b, it may be provided only at one of the ends. A protrusion 7 is formed at the center of the outer surface of the lower horizontal frame 3a of the magnet case 3. By fitting this fixing protrusion 7 into an engagement hole 1d drilled in the bottom 1c of the housing 1, the housing 1 is fixed. is attached to the specified position. The drilling position of this engaging hole 1d is such that the back side of the magnet 2 is in close contact with the inner circumferential surface of the side part 1b of the housing 1, as shown in FIG. It is set to be loaded immediately along the entire inner circumferential side. Housing 1 of magnet case 3
A magnetic pole plate 4 is fitted as a holding plate for the magnet 2 on the front surface opposite to the back surface that is in contact with the side portion 1b,
The magnet 2 is pressed and held against the inner circumferential surface of the housing side portion 1b. This magnetic pole plate 4 is also magnet 4 except for both ends.
It has the shape of a curved plate of uniform thickness that is bent to a curvature that allows it to fit closely on the front surface of the housing, and both ends thereof are bent toward the rear side in the radial direction of the housing to form a holding portion 4a. This holding part 4a is temporarily attached to the magnet case 3.
When the magnet 2 is fitted to the front side of the magnet case 3, it becomes reversely tapered in the removal direction, and prevents the magnet 2 from falling off from the magnet case 3. An appropriate number of magnet cases 3 constructed as described above are loaded along the entire inner circumference of the side portion 1b of the bowl-shaped housing 1. The height of the side portion 1b is longer than the height A of the magnet case 3, and in the prior art, this height difference C becomes the width of the curled portion 1a that is subsequently formed by bending. However, in the present invention, the width of the upper and lower spaces 5 created between the magnet case 3 and the magnet 2 is taken into consideration, and the curled portion width C' is set to be longer by that amount. That is, the folding line is set at a height A' that is lower than the height A of the magnet case 3 by the width.

When the magnet case 3 is fixed by uniformly bending the entire circumference of the side portion 1b of the housing 1 inward, that is, toward the rotating shaft side, according to the set bending line, as shown in FIG. The composition will be as follows. In FIG. 3, the formed curl portion 1a causes the magnet case 3 to
When the upper horizontal frame 3a is pressed, if the material is synthetic resin, that part will elastically deform. Since the folding line is set so that the height of the magnet case is compressed to A', the upper horizontal frame 3a pressed by the curled part 1a bends downward and comes into contact with the top surface of the magnet 2, and then the lower part The magnet 2 is pressed and moved downward by a width of 5. Therefore, the above-mentioned gap between the top and bottom two places =
5 is removed, and the magnet 2 is accommodated almost immediately in the accommodation space. Incidentally, since the depth B of the step 6 provided in this embodiment is set to be greater than the combined width of 5 between the two locations, the vertical frame portion 3b is not affected by the pressing action of the curled portion 1a as in the prior art. It will not be a hindrance. Therefore, the curled portion 1a is easily and uniformly bent around the entire circumference, and the gap between the magnet 2 and the magnet case 3 is also removed. is firmly held under pressure.

As described in detail above, according to the present invention, a magnet used in a rotor of a magnet generator can be firmly fixed by a simple method of uniformly bending the clamping pressure portion in one step. Therefore, production efficiency can be improved and manufacturing costs can be reduced without investing in large amounts of equipment. Furthermore, since the magnet 2 can be reliably fixed in the correct position, the precision of the product is improved and the functional quality is improved. It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made within the technical scope of the present invention. For example, the shape of the step may be formed obliquely such as chamfering, or it may be formed into an arbitrary curved shape, which may become an obstacle when forming a curved portion and clamping the magnet case. It is sufficient if the portion is formed so as to be removed. Further, when steps are provided at both ends of the vertical frame of the magnet case, the depth B of each step 6 can be more than half the total width of the upper and lower sides, as shown in FIG. 2a. However, in this case, as shown in FIG.
The lower step 6 that remains even after the bending is formed also disappears as a deformation space of the vertical frame 3b.

[Brief explanation of the drawing]

Figure 1a is a perspective view of a rotor of a conventional magnet generator, Figure 1b is a schematic sectional view taken in the circumferential direction of the rotor of a conventional magnet generator, and Figure 2a is a magnet generator according to the present invention. This is a schematic front cross-sectional view taken in the circumferential direction of the main part of the rotor according to the embodiment of the present invention, showing the unfixed state before the formation of the curled portion, FIG. 2b is a schematic plan cross-sectional view thereof, and FIG. This is a schematic front cross-sectional view taken in the circumferential direction of a main part of an embodiment of a rotor of a magnet generator according to the present invention, showing a state in which curled portions are formed and magnets are clamped and fixed via a magnet case. Explanation of symbols, 1: Housing, 1a: Curled part, 2: Magnet, 3: Magnet case, 5: Between, 6:
Step.

Claims (1)

[Scope of utility model registration request] The magnet is housed in a magnet case, the magnet case is loaded along the inner peripheral surface of the bowl-shaped housing, the open end side of the housing is bent to form a curled part, and the magnet case is sandwiched between the bottom of the housing and the curled part. A rotor for a magnet generator that maintains pressure, wherein the magnet case is formed into a rectangular frame shape, and at least one of both ends of the vertical frame of the rectangular frame is cut out to form a step. .