JPS5918855Y2 - magnet generator rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates particularly to improvements in the fixing structure of magnets in the rotor of a magnet generator.

Various types of magnet fixing structures have been known for the rotor of this type of magnet generator, but those that use ferrite magnets are particularly fragile, so it is necessary to protect the magnets. A fixed structure using a magnetic case has been widely used.

However, the conventionally known magnet fixing structure using such a magnet case prepares an independent magnet case for each magnet.
The basic structure was to fix this, together with the magnets housed inside, to the rotor body using two screws and an adhesive.

However, with this conventional fixing structure, it is necessary to fix each magnet individually, which is a complicated work.In addition, it is complicated to manage the torque and adhesive application when tightening screws, and as a result, the fixing work is complicated. It is difficult to automate the process, and the number of parts increases, leading to an increase in price.

The object of the present invention is therefore to eliminate such drawbacks, to provide a magnet fixing structure that can securely fix a magnet with a small number of parts, and can easily automate the fixing work.

An embodiment of the present invention shown in the drawings will be described below.

In FIGS. 1 to 5, the rotor body 10 is formed by forming a magnetic plate such as an iron plate into a bowl shape by press drawing.
A magnet case 20 made of a non-magnetic material such as synthetic resin is disposed inside the cylindrical portion 11 along the inner periphery thereof.

The magnet case 20 protects and fixes the magnet, which will be described later, and includes a ring-shaped base portion 21 and a plurality of columnar portions 22 integrally formed on the base portion to protrude at equal intervals in the circumferential direction. It is equipped with

In this magnet case 2o, the lower surface of the base portion 21 is attached to the bottom inner surface of the rotor body 10, and the outer circumferential surface of the base portion 21 and the outer circumferential surface of each columnar portion 22 are attached to the inner circumferential surface of the rotor body cylindrical portion 11. The rotor body 10 is disposed in contact with the rotor body 10 .

Between the adjacent columnar parts 22 of the magnet case 20, arc-shaped ferrite magnets 30 are magnetized in the radial direction.
and a similarly arcuate magnetic pole piece 4 arranged on its inner peripheral surface.
0 is stored.

At that time, the bottom surface of each magnet 30 and magnetic pole piece 40 is
The outer peripheral surface of each magnet 30 is in contact with the inner surface of the rotor body cylindrical portion 11, and each magnet 30 is placed here in contact with the surface of rotor body 11.
Both ends of the magnetic pole piece 40 in the circumferential direction are each provided with a columnar portion 22.
is in contact with the outer surface of

The height of each columnar portion 22 matches the axial length of the magnet 30.

Each columnar part 22 of the magnet case 20, which is located between adjacent magnets when each of the magnets 30 is housed, has a dovetail cross section. Slanted contact surface 23 that widens toward the peripheral end surface
are formed respectively.

Correspondingly, similar inclined contact surfaces 31 and 41 are formed on the inner peripheral surfaces of both ends of each magnet 30 and magnetic pole piece 40, respectively.

The contact surface 23 of each columnar part 22 is connected to the corresponding magnetic pole piece 4.
It is in contact with the contact surface 41 of 0 from the inner peripheral side.

In contrast to the dimension 11 of the integrated magnet 30 and pole piece 40 shown in FIG.
The corresponding dimension 12 of is selected slightly larger, so that the magnet 30 and the pole piece 4 are arranged between the columns of the magnet case 20.
0 can be easily stored.

In addition, each magnetic pole piece 40 is provided as necessary.
In some cases, it may be abolished, and in this case, the contact surface 23 of the columnar portion 22 is configured to directly contact the contact surface 31 of the magnet 30, and the dimensions of the magnet corresponding to 11 in FIG. The dimension 12 of is configured to be slightly larger.

A triangular wedge insertion groove (hole) 24 extending in the longitudinal direction is formed in each of the columnar parts 22, and each of the grooves 24
Each wedge 51 of the wedge 50 is driven in.

A notch-shaped opening 25 is provided on the inner circumferential surface of each columnar portion 22, reaching the groove 24 and extending from the upper end to the lower end, so that portions on both sides of the groove 24 can bulge outward.

Furthermore, the dimension 14 of the wedge 51 shown in FIG. 4 is formed slightly larger than the dimension 13 of the groove 24 shown in FIG. 3, so that by driving the wedge 51 into the groove 24,
The columnar portion 22 is bulged outward, and its contact surface 23 presses the contact surface 41.31 of the magnetic pole piece 40 (magnet 30), thereby pressing the magnetic pole piece 40 and the magnet 30 against the rotor body cylindrical portion 11. .

Note that a presser piece 26 is formed on the outer surface of each columnar portion 22 corresponding to the circumferential end surface of the magnet 30 to prevent movement of the magnet 30 in the circumferential direction.

The wedge ring 50 is made of a non-magnetic material such as synthetic resin, and is composed of each of the wedges 51 described above and a ring-shaped magnet holding part 52 that is integrated with the wedges 51. In the state in which the magnets are driven in, the magnet holding portions 52 abut against the upper end surfaces of each magnet 30 (and the magnetic pole pieces 40) and press them down.

The tip of each wedge 51 is tapered to facilitate insertion into the groove 24.

A ring-shaped protrusion 53 is formed along the entire circumference of the upper surface of the magnet holding portion 52 of the wedge ring 50 at its outer edge.

Then, the tongue portion 12 on the upper edge of the cylindrical portion 11 of the rotor body 10 is wrapped around this protrusion 53, thereby attaching the wedge ring 50 and the magnet case 20 to the magnet 30 and the magnetic pole piece 40 provided as necessary. It is also fixed to the rotor main body 10.

Note that each contact portion of the rotor body 10, the magnet case 20, and the magnet 30 (and the magnetic pole pieces 40) is filled with adhesive as necessary, so that the inner periphery of the upper end of the rotor body cylindrical portion 11 is filled with adhesive. A ring groove 13 for filling with adhesive is provided.

The rotor having the above configuration is assembled as follows.

That is, first, the magnet case 20 is inserted into the rotor main body 10, and when the magnets 30 and the magnetic pole pieces 40 are used, they are inserted between each adjacent columnar part 22 of the magnet case 20.

As mentioned above, the dimension 12 of the magnet case 20 is slightly larger than the dimension 11 of the magnet 30 and the pole piece 40 inserted therein, so this insertion is easy.

Next, each wedge 51 of the wedge ring 50 is driven into the groove 24 of each columnar portion 22 of the magnet case 20.

At this time, since each wedge 51 is integrated with the magnet holding part 52 of the wedge ring 50, each wedge 51 is inserted into each groove 24.
By applying force to the magnetic pole holding portion 52, the wedges 51 can be driven into all the grooves 24 at once.

Since the dimension 14 of this wedge 51 is slightly larger than the dimension 13 of the groove 24, by driving the wedge 51, the columnar part 2
The contact surface 23 of No. 2 presses the contact surface 41 of the magnetic pole piece 40 (the contact surface 31 of the magnet 30), and presses the magnet 30 against the inner periphery of the cylindrical portion of the rotor body 10.

At the same time, the magnet holding part 52 of the wedge ring 50 is attached to the magnet 30 (
The magnet 30 is held between the upper surface of the magnetic pole piece 40 and the magnet case base portion 21 whose lower surface is in contact with the upper surface of the magnetic pole piece 40.

After that, the ring groove 13 is filled with adhesive as necessary and the adhesive penetrates into each contact portion, and then the tongue portion 12 of the rotor main body cylindrical portion 11 is wrapped around the protrusion 53 of the magnet holding portion 52 of the wedge ring 50. Tighten.

Due to the presence of the protrusion 53, the tongue portion 12 is tightened along this, and therefore, when tightening, a large force that tries to deform the magnet holding portion 52 inward is not applied, and as a result, the magnet holding portion 52 is tightened. 52 (<rust ring 50) can be fixed to the rotor main body 10 in a proper state by the above-mentioned tightening.

In addition, since the contact area between the tongue portion 12 and the wedge ring 50 that has been tightened is increased by the presence of the protrusion 53, strong tightening can be achieved.

By this tightening, the wedge ring 50 is securely fixed to the rotor body 10, and therefore the magnet case 20 is also fixed to the magnet 30 (
and magnetic pole piece 40).

Thus, according to the above configuration, multiple magnets can be fixed at once by driving the wedge 51, compared to the conventional case where a case prepared for each magnet is individually fixed with screws. The magnet can be fixed with extremely simple work.

The above-mentioned series of assembly operations can be easily automated, and the magnet fixing operation can also be simplified in this respect.

As explained above, according to the present invention, it is possible to securely fix the magnet with a small number of parts, and furthermore, this fixing work can be made extremely simple, which is a distant relative effect.

[Brief explanation of drawings]

Fig. 1 is a half-sectional plan view showing an embodiment of the rotor according to the present invention, Fig. 2 is a sectional view taken along line II-II in Fig. 1, and Fig. 3 is a magnet case shown in Figs. 1 and 2. Fig. 4 is a bottom view of the wedge ring shown in Figs. 1 and 2, Fig. 5 is a top view of the wedge ring shown in Figs.
The figure is a cross-sectional front view of the same wedge ring. 10... Rotor body, 11... Cylindrical part, 12...
Tongue portion, 20... Magnet case, 21... Base portion, 22
... Columnar part, 24 ... Groove, 30 ... Magnet, 50.
... Wedge ring, 51... Wedge, 52... Magnet holding part, 53... Projection.

Claims (1)

[Claims for Utility Model Registration] A bowl-shaped rotor body, a plurality of arc-shaped magnets disposed on the inner periphery of the cylindrical portion of the rotor body, and a ring-shaped base portion in contact with the lower surface of each magnet. , and an inner circumferential surface near the circumferential end surface of each magnet formed integrally with the base portion and located between adjacent magnets, or near the circumferential end surface of a magnetic pole surface attached to the inner circumferential surface of each of these magnets. It has a plurality of dovetail-shaped columnar parts each having a contact surface in contact with the inner circumferential surface of the columnar part, each of the columnar parts has a groove for inserting a wedge having a triangular cross section extending in the longitudinal direction, and a part of each of these grooves a magnet case having a notch-shaped opening opening on the inner circumferential side and extending from the upper end to the lower end; a ring-shaped magnet holding part that is in contact with the top surface of each of the magnets; a plurality of wedges each having a triangular surface and driven into the grooves of each of the columnar parts and having a circumferential dimension larger than the circumferential dimension of the groove; and a ring-shaped wedge formed around the entire outer edge of the magnet holding part. a wedge ring having a protrusion, when each of the wedges is driven into the groove of each of the columnar parts, each of the columnar parts is pushed out from the opening; The contact surface is pressed against the contact surface of the magnet or the magnetic pole piece, so that the magnet is pressed against the inner periphery of the cylindrical portion of the rotor body, and the upper edge of the cylindrical portion of the rotor body is pressed against the magnet holder of the wedge ring. The rotor of a magnet generator is wound around the protrusions of the section.