JPH0649102Y2 - Magnet generator rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a rotor of a magnet generator, for example, a rotor effectively used as a rotor of a vehicle magnet generator.

[Conventional technology]

As a conventional alternator for vehicles, there is known an alternator in which a magnet is used as a source of an exciting magnetic flux, as described in JP-A-60-96163.

However, in this vehicle alternator, since the ring-shaped magnet and core are mounted on the shaft, the magnetic flux of the magnet may leak through the shaft when the shaft forms a magnetic path. In particular, when a ferromagnetic material such as iron is used as the material forming the shaft, the leakage magnetic flux increases. Therefore, the magnetic flux flowing through the core required for power generation is significantly reduced, and the power generation performance is reduced. Further, since the core is press-fitted onto the shaft, gaps are generated in the axial direction of the core and the magnet, or the magnet is damaged during press-fitting.

Therefore, as described in Japanese Patent Application Laid-Open No. 60-210156, a magnet having a cylindrical shape with no holes is used to support the magnet with a ring and the ring with a core. A rotor of a magneto-generator configured according to the above has been proposed. According to the rotor of this magnet generator, it is possible to prevent the leakage magnetic flux from being generated and the magnet from being damaged at the time of press fitting.

[Problems to be solved by the device]

However, in the rotor of the magneto-generator according to the above configuration, since the gap between the magnet and the core cannot be adjusted, the exciting magnetic flux cannot be adjusted, and the output current is controlled according to the engine speed. There is a problem that you cannot do it.

An object of the present invention is to provide a rotor of a magnet generator capable of adjusting an exciting magnetic flux.

[Means for Solving the Problems]

The rotor of the magneto generator according to the present invention comprises a pair of cores (11,
12) and a ring (13) made of a non-magnetic material
And a pillar-shaped magnet (14) arranged in the ring (13) and having one end face fixed to one core (11) and magnetized along the axial direction of the ring (13). The cores (11, 12) have pillar-shaped bases (16, 17), and the ring (1) is provided on one end surface of the bases (16, 17).
3) Fitting protrusions (18, 19) that can be fitted with the shafts (20, 21) are bulged on the other end face, and both bases (16, 17) A plurality of claw portions (22, 22) protruding in the same direction as the fitting convex portions (18, 19) are provided on the outer periphery of the
23) is bulged, and the fitting protrusions (18, 19) of the cores (11, 12) are fitted to the inner circumference of the ring (13) with the magnet (14) in between. And at least one of the fitting protrusions (19) of the core (12) is fitted to the fitting protrusion (18) of the other core (11) having the magnet (14) fixed to the ring. It is characterized in that it is mounted so as to be movable along the axial direction of (13).

[Action]

According to the above-mentioned means, at least one fitting protrusion of the fitting protrusions of the core fitted in the ring is mounted so as to be movable along the axial direction of the ring. By moving the combined convex portion, the gap between the magnet and the core can be adjusted, and as a result, the output current of the magnet generator can be adjusted according to the rotation speed.

〔Example〕

FIG. 1 is a longitudinal sectional view showing a rotor of a magnet generator according to an embodiment of the present invention, FIG. 2 is a partially cut side view showing one core, and FIG. 3 is a partial cut showing the other core. It is a side view.

In the present embodiment, a magneto-generator 10 according to the present invention comprises a pair of cores 11 and 12 (hereinafter referred to as a first core 11 and a second core 12).
There is a thing. ), A ring 13 formed of a non-magnetic material, and a columnar magnet 14 arranged on the inner peripheral side of the ring 13 and magnetized along the axial direction of the ring 13. It is arranged in the stator 15.

Both cores 11 and 12 have base portions 16 and 17 formed in a substantially disc shape, respectively, and one end surface of each base portion 16 and 17 is for fitting that can be fitted to the inner peripheral side of both ends of the ring 13. Projections 18, 19
Are swelled and formed, and shaft portions 20 and 21 forming a rotation axis are swelled and formed on the other end face. Further, a plurality of claw portions 22 and 23 are formed on the outer peripheral sides of both the base portions 16 and 17 so as to bulge so as to project in the same direction as the convex portions 18 and 19. The convex portion 18 of the first core 11 is fitted to the inner circumference of the ring 13 and is coupled by the serration coupling portion 24 so as to rotate integrally. The tip surface of the convex portion 18 is connected to both end faces of the magnet 14. A pair of bonded elastic bodies 2
The first elastic body 25 of 5, 26 is attached by an adhesive.

On the other hand, in the second core 12, the male serration 27 formed on the convex portion 19 of the second core 12 is slidably fitted to the female serration 28 formed on the inner circumference of one end of the ring 13, so that the ring 13 has an axial center. It is attached so as to be movable in any direction and to rotate integrally. This female serration 28 is second
When fitted to the male serration 27 of the convex portion 19 of the core 12, the second elastic body adhered to the tip surface of the convex portion 19 and the tip surface of the first core 11 opposite to the first elastic body 25. The length is set so that an appropriate gap (air gap) G is formed between the gap 26 and 26.

When the rotor 10 is housed in the stator 15, the shaft portions 20 and 21 of both cores 11 and 12 are rotatably supported by bearings 29 and 30, respectively, and the shaft portion 20 of the first core 11 is a nut.
It is connected to a pulley 32 which is linked with an engine (not shown) by 31. On the other hand, a pair of spacers 34 and 35 each formed in a wedge shape are rotatably fitted on the outer end of the shaft portion 21 of the second core 12, and the shaft portion 21
The collar portion 33 that is integrally provided at the tip of the
(Hereinafter, it may be called a driven spacer.) It is slidably engaged. A shaft 36 is integrally connected to a spacer (hereinafter referred to as a drive spacer) 35 arranged inside, and the shaft 36 is configured to be driven by a solenoid 37 in a direction perpendicular to the axial direction. . When the solenoid 37 moves in the direction indicated by arrow X, the drive spacer 35 moves in the direction perpendicular to the axial direction, and the driven spacer 34 moves in the direction Y. That is, the second core 12 is moved in the axial direction of the ring 13 by the movement of the solenoid 37. That is, the length of the gap G is adjusted by the movement of the solenoid 37.

Further, when the rotor 10 is housed in the stator 15, the claw portions 22 and 23 of both the cores 11 and 12 are alternately arranged outside the ring 13, and the claw portion 22 of the first core 11 is one side. When the magnetic pole surface S is formed, the claw portion 23 of the second core 12 forms the other magnetic pole surface N. And each claw portion 22, 23
Is disposed close to the stator core 38 and the stator coil 39 fixed to the inner peripheral side of the stator 15, and a magnetic path is formed between the stator core 38 and the stator core 38 by the rotation of both cores 11 and 12. It is like this.

Next, the operation will be described.

When the pulley 32 is rotated by driving the engine, both the cores 11, 12, the ring 13 and the magnet 14 are rotated by the rotation of the pulley 32.

When the output of the generator is insufficient in the low rotation range at the time of starting, the air gap G is set to the minimum by operating the solenoid 37 in a predetermined direction. When the air gap G becomes small, the magnetic flux density becomes large, so that the output current of the generator becomes large and the output torque is increased.

On the other hand, when the rotation speed of the magneto generator rises and the output current exceeds the set current, the solenoid 37 is operated in the opposite direction to set the gap G to be large. When the gap G becomes large, the magnetic flux density becomes small, so that the output current is reduced. That is, the output current of the generator can be controlled by adjusting the gap G.

In the present embodiment, since the magnet 14 is formed in the columnar shape, the magnetic flux generated from the magnet 14 is passed to both the cores 11 and 12 without waste. further,
Since the magnet 14 is joined to the core 11 via the elastic body 25, it is possible to prevent the magnet 14 from being damaged at the time of joining.

The present invention is not limited to the above embodiment,
It goes without saying that various modifications can be made without departing from the spirit of the invention.

For example, as a means for arranging one of the cores to be movable in the axial direction with respect to the ring, not only serrations but also sliding keys, splines or the like may be used.

Further, the wedge-shaped spacer is not used as the driving means for moving the core and the ring relatively.

[Effect of device]

As described above, according to the present invention, since the air gap between the magnet and the core can be increased or decreased, the output current of the magnet generator can be controlled by adjusting the air gap. You can

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a rotor of a magneto-generator which is an embodiment of the present invention, FIG. 2 is a partially cut side view showing one core, and FIG. 3 is a side view showing the other core. Is. 10 ...... Magnet generator rotor, 11, 12 ...... Core, 13 ...... Ring, 14 ...... Magnet, 15 ...... Stator, 16, 17 ......
Base, 18, 19 ... Convex, 20, 21 ... Shaft, 22, 23 ... Claw, 24 ... Serration joint, 25, 26 ... Elastic body, 27
…… Male serration, 28 …… Female serration, 29,30…
… Bearings, 31… Bolts, 32… Pulleys, 33… Flange parts, 34, 35… Spacers, 36… Shafts, 37…
… Solenoid, 38 …… Stator core, 39 …… Stator coil.

Claims (1)

[Scope of utility model registration request] 1. A pair of cores (11, 12), a ring (13) formed of a non-magnetic material, and a ring (13) disposed inside the one end surface of which is fixed to one core (11). Ring (13)
And a pillar-shaped magnet (14) magnetized along the axial direction of the core, the cores (11, 12) having pillar-shaped bases (16, 17). , 17) on one end of the ring (1
3) Fitting protrusions (18, 19) that can be fitted with the shafts (20, 21) are bulged on the other end face, and both bases (16, 17) A plurality of claw portions (22, 22) protruding in the same direction as the fitting convex portions (18, 19) are provided on the outer periphery of the
23) is bulged, and the fitting protrusions (18, 19) of the cores (11, 12) are fitted to the inner circumference of the ring (13) with the magnet (14) in between. And at least one of the fitting protrusions (19) of the core (12) is fitted to the fitting protrusion (18) of the other core (11) having the magnet (14) fixed to the ring. A rotor for a magneto generator, which is mounted so as to be movable along the axial direction of (13).