JPS6016147A - Magneto generator - Google Patents

Abstract

PURPOSE:To efficiently cool a generating coil of a stator by providing a self- heat generating and cooling fan in a rotor. CONSTITUTION:Cooling air generated by vanes 18 by the rotation of a rotor 1 passes an air gap of a generating coil 11 of each pole as designated by an arrow while removing heat generated from the coil 11, and flows out from a vent window 17 of a flywheel 5 into a cover 3. After the flowed out cooling air is contacted with the end 3a of the cover 3, the air passes through the gap between the cylinder 5a of the flywheel 5 and the cover 3, and dissipates the heat removed thereat through the cover 3 externally. Then, the cooled air is again circulated from the hole side of the flywheel 5 into the air gap of the coil 11. When the cooling air is thus circulated, the coil 11 can be efficiently cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnet generator used in a vehicle or the like, and particularly relates to a cooling structure for a power generation coil of a stator.

[Background of the invention]

Figure 1 shows the structure of a conventional magnet generator. 1 is a rotor,
2 is a stator, and 3 is a cover that covers the rotor 1 and stator 2 in a sealed state. The rotor 1 is.

A bowl-shaped flywheel 5 fixed to a drive shaft 4 of an internal combustion engine, a plurality of magnets 6 attached to the inner peripheral surface of a cylindrical portion 5a of the flywheel 5, and a plurality of magnets 6 attached to the inner peripheral surface of the flywheel 5. It consists of a non-magnetic plate 7.8 which fixes both end surfaces of the magnetic head 6 in the axial direction. The stator 2 consists of a power generation core 10 fixed to the engine case 9 inside the magnets 6 of the rotor 1, and a power generation coil 11 in which a conductive wire is wound around the power generation core 10. The cover 3 is attached to the engine case 9.

A tapered portion 4a is formed at one end of the drive shaft 4, and a cylindrical boss 12 is fitted into the tapered portion 4a. Further, the boss 12 is attached to the end surface of the drive shaft 4 via a washer 13.
A nut 14 is screwed onto the tapered portion 4a. The flywheel 5 of the rotor 1 is fixed to the flange 128 of the boss 12 by being crimped with studs 15. Further, near the bottom of the inner surface of the cylindrical portion 5a of the flywheel 5, a receiving surface (extrusion) 16 for a non-magnetic plate 7 is provided, and non-magnetic plates 7.8 are arranged on both sides of the magnet 6 to open the flywheel 5. The magnet 6 and the non-magnetic plate 7.8 are attached to the flywheel 5 by pressurizing the side end faces and bending them into an L shape.

By the way, in a magnet generator, copper loss due to the resistance of the generating coil 11 in the stator 2 and iron loss due to magnetic flux passing through the generating core 10 and the flywheel 5 of the rotor 1 are released as thermal energy. In other words, self-heating increases. on the other hand.

As is well known, when the temperature of an insulator increases by 10 degrees Celsius, the life of the insulator is reduced by approximately half.

However, since conventional magnet generators do not have a means to cool down the self-heating described above, problems such as significantly shortening the insulation life of the insulator used to insulate the generator coil 11 and causing burnout occur. was there. In addition, as a countermeasure to this, the outer diameter of the power generation coil 11 is increased and the space factor of the power generation coil 11 is improved.
While winding thick conductor wires to reduce copper loss and even using high-grade insulating materials to increase the output of the generator itself, the need for compactness and weight reduction due to vehicle functionality and energy conservation demands. There is a problem in terms of cost.

Other 1 forced cooling method is Utility Model 56-202
There is a publication No. 76.

[Purpose of the invention]

The object of the present invention is to overcome the problems of the prior art.

An object of the present invention is to provide a magnet generator in which a rotor is provided with a fan for self-heating cooling, and a generating coil of a stator can be efficiently cooled.

[Summary of the invention]

In order to achieve this objective, the magnet generator of the present invention has a plurality of ventilation windows opened at appropriate intervals in the circumferential direction on the bottom surface of the flywheel of the rotor, and non-magnetic A blade formed by bending a part of the non-magnetic plate is provided in a portion of the plate facing the ventilation window, each blade is inserted inside the ventilation window, and the blade is rotated by rotation of the rotor. The cooling air generated by the cooling air is circulated between the ventilation window of the flywheel, the gap between the rotor and the cover, and the gap of the generator coil of the stator.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5. Fig. 2 is a longitudinal sectional view of the magnet generator according to the present invention, Fig. 3 is a front view of Fig. 2, Fig. 4 is a front view of the non-magnetic plate according to the invention, and Fig. 5 is a side view of Fig. 4. It shows. In the figures, the same reference numerals as those in FIG. 1 represent the same or equivalent elements, so their explanation will be omitted. A plurality of ventilation windows 17 are provided on the bottom surface of the flywheel 5 of the rotor 1 at appropriate intervals in the circumferential direction. Each ventilation window 17 is provided at a position corresponding to the stator 200 coils 1. Also flywheel 5
A blade 18 formed by bending a part of the inner diameter of the non-magnetic plate 7 is provided in a portion of the non-magnetic plate 7 located on the bottom side facing the ventilation window 17, and each blade 18 is provided with a ventilation window. 17 respectively. and,
When the blades 18 rotate together with the rotor 1, they circulate the cooling air in the direction of the arrow in FIG. ．． Cooling air can be circulated between the gaps.

Since the magnet generator according to the present invention has the above-mentioned configuration, 1
The cooling air generated by the blades 18 due to the rotation of the rotor 1 flows through the gaps in the generating coils 11 of each pole as shown by the arrows in FIG.
The electricity generating coil 11 passes while removing the generated heat,
The flywheel 50 flows out into the cover 3 through the ventilation window 17. After the cooling air that flows out hits the end surface 3a of the cover 3,
The heat passed through the gap between the cylindrical portion 5a of the flywheel 5 and the cover 3 is radiated to the outside via the cover 3.

The cooled cooling air then circulates again from the open side of the flywheel 5 to the gap of the power generation coil 11. By circulating the cooling air in this manner, the power generation coil 11
is efficiently cooled.

Therefore, the life of the insulator of the generator coil 11 is reduced or burnout is unlikely to occur. Also, power generation coil 1
Since there is no need to make the conductor wire 1 thicker or use high-grade insulating material, it is possible to reduce the size, weight, and cost. In particular, since the cooling blades are integrated with the non-magnetic plate for holding the magnet, there is no need to consider special means for fixing the blades, and they can be easily fixed to a wire. Processing and assembly are extremely easy.

〔Effect of the invention〕

As explained above, according to the present invention, the power generation coil of the stator can be efficiently cooled, thereby extending the life of the insulator and preventing burnout.

In addition, there is no need to thicken the conductor wire of the generating coil or use high-grade insulating materials, making it possible to reduce size, weight, and cost.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional magnet generator, and FIG. 2 is a longitudinal sectional view showing a magnet generator according to the present invention. 3 is a front view of FIG. 2, FIG. 4 is a front view of the nonmagnetic plate in the present invention, and FIG. 5 is a side view of FIG. 4. 1... Rotor, 2... Stator, 3... Cover, 4
... Drive shaft 5... Bowl-shaped flywheel 6...
・Magnet ・7゜8...Non-magnetic plate ・9...Engine case・
10...Generating core, 11...Generating coil, 17...
・Ventilation window, 18... blade. Agent Patent Attorney Akio Takahashi Kaya l Item 8 Item 2 Item 6 Item 4 Figure 5

Claims (1)

[Claims] 1. A rotor that is attached to a drive shaft of an internal combustion engine, a stator that is attached to an engine case, and a cover that is attached to the engine case and covers the rotor and stator in a hermetically sealed state, and the rotor includes: A bowl-shaped flywheel fixed to the drive shaft, a magnet attached to the inner circumferential surface of the flywheel, and a non-magnetic plate fixing both axial end surfaces of the magnet on the inner circumferential surface of the flywheel. In the magnet generator, the stator is composed of a power generation core fixed to the engine case inside the magnet of one rotor, and a power generation coil having a conductive wire wound around the power generation core. A plurality of ventilation windows are provided at appropriate intervals in the circumferential direction on the bottom surface of the flywheel, and a portion of the non-magnetic plate facing the ventilation windows located on the bottom surface side of the flywheel is provided with a plurality of ventilation windows. A blade formed by partially bending is provided, each blade is inserted inside the ventilation window, and cooling air generated by the blade as the rotor rotates,
A magnet generator characterized in that the magnet generator is configured to circulate between a gap between the first rotor of the ventilation window of the flywheel and the cover, and a gap between the generator coil of the stator.