JPS5918854Y2 - 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 difficult 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.

Therefore, the present invention aims to eliminate such conventional drawbacks and provide a magnet fixing structure that can securely and firmly fix a magnet with a small number of parts and that 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 its circumference.

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 20, 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.

Each magnetic pole piece 40 is provided at its upper and lower ends with two tongue pieces 41 that extend substantially perpendicularly toward the outer diameter side, and these are in contact with a portion of the upper and lower surfaces of the magnet 30, respectively. .

Therefore, each magnet 30 is held between the tongue pieces 41 at the upper and lower ends of the corresponding magnetic pole piece 40, thereby fixing them together at least in the axial direction.

At this time, cutout-like relief portions 42 are formed on both sides of the root portion of each tongue piece 41 of each magnetic pole piece 40, making it easy to reduce the error between the dimension between the upper and lower tongue pieces and the axial dimension of the magnet 30. The magnetic pole piece 40 is taken into account so that the magnetic pole piece 40 is not deformed.

Note that this relief portion 42 is provided as necessary.

Thus, each magnet 30 and magnetic pole piece 40 coupled as described above has a lower surface placed on the base portion 21 of the magnet case 20, and an outer peripheral surface of the magnet 30 is placed on the inner peripheral surface of the rotor body cylindrical portion 11. They are housed between the columnar parts of the magnet case 20 in contact with each other.

On the surface of the base portion 21 of the magnet case 20, a groove 21a having a depth matching the thickness of the tongue piece 41 is formed at a position corresponding to each tongue piece 41 at the lower end of each magnetic pole piece 40. 41
is fitted into this groove 21a.

Therefore, the lower surface of each magnet 30 is in contact with the surface of the magnet case base portion 21 over almost the entire area due to the presence of the tongue piece 41 .

The groove 21a is provided as necessary, and if it is not provided, the lower surface of each magnet 30 will not come into direct contact with the magnet case base portion 21, and only the tongue piece 41 will come into contact with it.

Note that the height of each columnar portion 22 is designed to match the axial length of the magnet 30.

Each columnar part 22 of the magnet case 20, which is located between adjacent magnets by housing each of the magnets 30 and the magnetic pole pieces 40, has a dovetail cross section, so that the outer surface of the inner circumference side thereof is formed into a dovetail shape. A slanted abutment surface 23 is formed on each side surface, which widens toward the inner peripheral end surface.

Correspondingly, similar inclined contact surfaces 31 and 43 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 43 of 0 from the inner peripheral side.

The magnet case 20 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.

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 ring 50 is driven into the wedge ring 50.

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 presses the contact surface 43 of the magnetic pole piece 40 with its contact surface 23, causing the magnetic pole piece 40 and the magnet 30 to
is pressed 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 consists of the wedge 51 described above and a ring-shaped holding part 52 integrated with the wedge 51.
In the state in which the holding portion 52 is driven into the groove 24 of each magnetic pole piece 40
It comes into contact with each tongue piece 41 at the upper end of and presses it down.

At this time, grooves 52 a having a depth matching the thickness of the tongue piece 41 are formed as necessary on the lower surface of the presser part 52 at positions corresponding to each of the tongue pieces 41 . Groove 52
H, and the holding part 52 is in contact with the upper surface of each magnet 30.

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

The tongue portion 12 on the upper edge of the rotor body cylindrical portion 11 is wrapped around the outer edge of the upper end of the holding portion 52 of the wedge ring 50, so that the wedge ring 50 and the magnet case 20 are connected to the magnet 30 and the magnetic pole integrated therewith. It is fixed to the rotor body 10 together with the piece 40.

In addition, the rotor main body 10, the magnet case 20,
Each contact portion of the magnet 30 and the magnetic pole piece 40 is filled with an adhesive, and for this purpose, a ring groove 13 for filling the adhesive is provided on the inner periphery of the upper end portion of the rotor body cylindrical portion 11.

The rotor having the above configuration is assembled as follows.

That is, first, the magnet case 20 is inserted into the rotor body 10, and the magnets 30 and the magnetic pole pieces 40, which are connected by the tongue pieces 41, are inserted between each adjacent columnar part 22 of the magnet case 20.

As described above, the dimension 1□ of the magnet case 20 is slightly larger than the dimension 1□ of the magnet 30 and the magnetic pole piece 40 inserted here, so this insertion is easy.

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

At this time, each wedge 51 is attached to the holding portion 52 of the wedge ring 50.
Since the wedges 51 are integrated into each groove 24, the wedges 51 can be driven into all the grooves 24 at once by applying force to the holding portion 52.

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, pressing the magnet 30 and the magnetic pole piece 40 against the inner periphery of the cylindrical portion of the rotor body 10, and firmly fixing them in the radial and circumferential directions.

At the same time, the holding part 52 of the wedge ring 50 comes into contact with the upper surface of the magnet 30 and the tongue piece 41 of the magnetic pole piece 40, and the magnet 30 and the magnetic pole piece 4
Hold 0.

As described above, when the grooves 21a and 52a into which the tongue pieces 41 are inserted are provided in the magnet case base portion 21 and the wedge ring holding portion 52, the magnet 30 and the magnetic pole piece 40 can be more securely held.

After that, the ring groove 13 is filled with an adhesive as necessary and the adhesive is permeated into each contact portion, and then the tongue portion 12 of the rotor main body cylindrical portion 11 is wrapped around the outer edge of the presser portion 52 of the wedge ring 50.

By this tightening, the wedge ring 50 and the magnet case 2
0 is securely fixed between the bottom of the rotor body 10 and the seaming portion, and therefore the magnets 30 and the pole pieces 40 are also firmly fixed in the axial direction.

In this way, according to the above-mentioned structure, by driving the wedge 51, a plurality of magnets and magnetic pole pieces can be reliably fixed at once, and when cases prepared for each magnet are individually fixed with screws as in the conventional case. Compared to the above, it is possible to firmly fix the magnet with an extremely simple operation.

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

Furthermore, in the above configuration, since the tongue piece that holds the magnet is provided on the magnetic pole piece, it is possible to easily insert the magnet and the magnetic pole piece into the magnet case, and the tongue pieces can connect and integrate the two. The magnets and pole pieces are clamped by the magnet case and the wedge ring, and are coupled to the rotor body by tightening the tongues of the rotor body, thereby making it possible to fix the magnets and pole pieces very firmly.

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 the drawing]

Fig. 1 is a partially 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. Perspective view of 4th
The figures are a perspective view of the wedge ring shown in FIGS. 1 and 2, and FIG. 5 is a perspective view of the magnet and pole piece. 10... Rotor body, 11... Cylindrical part, 20...
Magnet case, 21... Base part, 22... Column part, 2
4...Groove, 30...Magnet, 40...Magnetic pole piece, 41
... tongue piece, 50 ... wedge ring, 51 ... wedge, 52 ... presser part.

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; an arcuate magnetic pole piece having tongues at the lower end that are in contact with parts of the upper and lower surfaces of the magnet; a ring-shaped base that is in contact with at least the tongues at the lower end of each magnetic pole piece; a plurality of dovetail-shaped columnar portions each formed between adjacent magnets and having contact surfaces in contact with the inner circumferential surface near the circumferential end surface of each of the magnetic pole pieces, and a cross section extending in the longitudinal direction of the columnar portion; a magnet case having a triangular groove for inserting a wedge, and a notch-shaped opening extending from the upper end to the lower end by opening a part of each of these grooves to the inner circumferential side; and at least the upper end of each of the magnetic pole pieces. a non-gang-shaped holding part that is in contact with the tongue piece; and a non-tangular holding part that is formed integrally with the holding part and has a triangular cross section and is driven into the groove of each columnar part, and has a circumferential dimension larger than the circumferential dimension of the groove. and a wedge nong having a plurality of wedges having a shape, 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, and a wedge is formed on both sides of each of the columnar parts. The magnet is pressed against the inner periphery of the cylindrical portion of the rotor body by the contact surface via the magnetic pole piece, and the upper edge of the cylindrical portion of the rotor body is wrapped around the outer edge of the holding portion of the wedge ring. The rotor of a magnet generator.