JPS5818467Y2 - magnet generator - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a magnet generator, particularly a magnet generator in which a magnet is fixed from the direction of the rotation axis of a rotor.

Conventionally, the magnets used in magnet generators are able to secure the inside of the rotor by pressing the magnetic pole pieces provided on the inner circumference of the magnet in the radial direction from the outer circumference of the rotor using fixing means such as screws or rivets. It was fixed on the periphery.

Since this magnetic pole piece is made of a ferromagnetic material such as iron, leakage of magnetic flux occurs from the magnetic pole piece, and as a result, the output of the generator tends to decrease.

Furthermore, since the magnetic pole piece is manufactured by pressing a thin plate or the like, it is difficult to keep the inner diameter of the magnetic pole piece constant after fixing, and it is necessary to process the inner diameter after fixing.

Furthermore, in order to tighten in the radial direction, it is necessary to appropriately tighten the tool or the rotor, which has the drawback of extremely poor workability.

In order to eliminate the above-mentioned drawbacks, the magnets are rotated in the direction of rotation of the rotor (
Hereinafter, it will be referred to as the axial direction.

) and is fixed to the rotor and does not require magnetic pole pieces (hereinafter referred to as an axially fixed magnet generator).

) was devised. By the way, ferrite magnets are generally used as the magnets fixed to the rotor of magnet generators, and these ferrite magnets have a sintered density of 4.7 to 5.0 g/cm3 and a bending strength of 5 to 7 kg/mm2. It is weak, and the mechanical strength of the corners is also weak.

In the axially fixed magnet generator, no measures have been taken to address the above-mentioned mechanical drawbacks of ferrite magnets.

Therefore, in the axially fixed magnet generator, if an external force is directly applied to the magnet during manufacture, the magnet is likely to be damaged, and furthermore, if the magnet is cracked due to vibration or heat from the engine during use, The drawback was that the magnets would break apart.

This idea was made in view of the above circumstances,
Equipped with a protective member that facilitates installation work, prevents direct application of external force to the magnet during manufacture, and prevents the magnet from breaking apart if cracks occur in the magnet due to vibration or heat during use. It is an object of the present invention to provide an axially fixed magnet generator.

An embodiment of this invention will be described below with reference to the drawings.

In Figures 1 to 3, reference numeral 1 denotes a flywheel made of a cylindrical magnetic material, which constitutes the casing of a magnet generator and is a rotor that is driven by being connected to the rotating shaft of an engine (not shown). The periphery is provided with a mounting surface (magnet mounting surface) 1C for mounting a permanent magnet 2, which will be described later, and a stepped portion 1d formed at a position a predetermined distance from one end.

2 is radially magnetized and has a mounting surface 1C on the inner circumference of the rotor.
An arc-shaped permanent magnet attached to the slanted surface 2a formed by removing a part of the axial end as shown in FIG.
It is equipped with

This inclined surface 2a is formed at an acute angle with respect to the magnet mounting surface, and forms a protrusion 4a of the support member 4, which will be described later.
This is for pressing the permanent magnet 2 against the stepped portion 1d and the mounting surface 1C.

3 is an aluminum box-shaped protective member that covers and houses this permanent magnet.As shown in detail in Figure 3, the magnet faces the stator (not shown) of the magnet generator. It has a bottom surface 3a that covers the surface, side surfaces 3b and 3C that cover the side surfaces of the permanent magnet 2 in the axial direction, and side surfaces 3d and 3e that cover the side surfaces of the permanent magnet 2 in the rotational direction. The side on which the member is provided, that is, the side surface 3b, is a large chevron-shaped surface, and this side surface 3b is provided with a circular through hole 3f and a fixing hole 3g spanning the bottom surface 3a.

In other words, the protective member 3 covers the permanent magnet 2 other than the mounting surface that is connected to the mounting surface 1C.

4 penetrates the fixing hole 3g of the protection member 3 and contacts the axial protrusion 4a that contacts the inclined surface 2a of the permanent magnet 2 and the side surface 3b of the protection member 3 to attach the protection member 3 to the flywheel 1.
A support member having a substantially L-shaped cross section and a radial support portion 4b that is inserted and fixed between the support portion 1a and the support portion 1a, and the support portion 4b has a through hole (not shown). have.

5 is a screw (fastening member) that passes through the through hole 3f of the protection member 3 and the through hole (not shown) of the support member 4 and fixes the protection member 3 and the support member 4 to the flywheel 1 under pressure from the axial direction. In this case, the screw 5 fixes the support member 4, the protection member 3, and therefore the permanent magnet 2 to the flywheel 1.

Since the screw 5 presses the support member 4 in the axial direction in this manner, the protruding portion 4a of the support member 4 presses the inclined surface 2a of the permanent magnet 2 toward the step portion 1d.

At this time, as is clear from FIG. 1, the inclined surface 2a
A component of the pressing force of the support member 4 presses the permanent magnet 2 in the outer circumferential direction.

On the other hand, the support member 4 has a distal end portion of the support portion 4b connected to the receiving portion 1a of the flywheel 1, and a protruding portion 4a connected to the stepped portion 1d of the flywheel 1 and the mounting surface 1 via the permanent magnet 2.
Since the drag force is received from C, the permanent magnet 2 is more securely attached to the permanent magnet 2 than when the entire surface of the support member 4 receives drag force from the flywheel 1.
can be pressurized.

As described above, as shown in FIG. The permanent magnets 2 are also pressurized and fixed by the axial component of the pressing force of the inclined surface 2a.

Therefore, the protection member 3 and the permanent magnet 2 are securely fixed to the flywheel 1.

Figure 4 shows another embodiment of this invention.
A flange-like locking portion 3h is formed by bending the tip end of the magnet 2 to the opposite side of the permanent magnet 2, and a retaining portion 1b that engages with this locking portion is provided on the flywheel 1 to fix the protective member 3. For example, the protection member 3 can be fixed to the flywheel 1 more reliably, and the protection member 3 can be prevented from protruding toward the rotation axis.

In the above embodiment, the protective member 3 is provided with a fixing hole 3g, and the permanent magnet 2 is directly pressurized by the support member 4 passing through the fixing hole 3g. However, if the fixing hole 3g is not provided, the protective member 3 As mentioned above, since it is box-shaped made of aluminum, when the support member 4 is strongly pressed, the tip of the protrusion 4a bites into the side surface 3b of the protection member 3, and the inclined surface 2 of the permanent magnet 2
Since a part of the protection member 3 protrudes toward the rotating shaft of the flywheel 1, a fixing hole 3g is provided to prevent the protection member 3 from protruding.

However, if the protective member 3 is provided with a portion corresponding to the inclined surface 2a of the permanent magnet 2, the fixing hole 3g can be omitted.

As described above, according to this invention, since the magnet and the protective member covering the magnet are fixed to the rotor in the axial direction from one end of the rotor, the work of attaching the magnet is facilitated, and the need for magnetic pole pieces can be eliminated.

In addition, since the magnet is provided with an inclined surface and this inclined surface is pressed in the axial direction from one end of the rotor by the protrusion of the support member,
The magnets are pressed against the stepped portion of the rotor and the mounting surface by component forces in the respective directions applied to the inclined surface, so that the magnets and the protection member can be held securely.

Furthermore, since the part of the magnet other than the mounting surface that connects to the magnet mounting surface of the rotor is covered with a protective member, external force is prevented from being directly applied to the magnet during the manufacture of the magnet generator, and damage to the magnet can be prevented. In addition, even if the magnet cracks due to vibrations or heat from the engine during use, it is possible to prevent the magnet from breaking apart.

[Brief explanation of drawings]

Fig. 1a is a partial front view of an embodiment of this invention, Fig. 1 is a partial sectional side view of the one shown in Fig. 1a, and Fig. 2 is an enlarged perspective view of the permanent magnet shown in Fig. 1. 3 is an enlarged perspective view of the protection member shown in FIG. 1, and FIG. 4 is a partially sectional side view corresponding to FIG. 1 of another embodiment of this invention. In the figure, 1 is a flywheel, 1C is a mounting surface, 1d is a step, 2 is a permanent magnet, 2a is an inclined surface, 3 is a protection member, 4
5 is a support member, and 5 is a screw (fastening member). Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A rotor that is formed in a cylindrical shape and has a stepped portion formed on the inner circumference of the magnet mounting surface at a predetermined distance from one end; A permanent magnet whose surface is formed with an inclined surface that forms an acute angle with respect to the magnet mounting surface, a protective member that covers a part of the permanent magnet other than the mounting surface that is connected to the magnet mounting surface, and a protective member that is attached to the rotor. It has a protrusion that penetrates in the axial direction from one end side and comes into contact with the inclined surface, and is fastened to the rotor from the one end side of the rotor via a fastening member, so that the protrusion allows the permanent A magnet comprising a support member that presses an inclined surface of the magnet to bring the permanent magnet into pressure contact with the magnet mounting surface, and also presses the protective member against the step to support the protective member between the step and the step. Generator.