JPH05260713A - Generator - Google Patents

Abstract

PURPOSE:To suppress as effectively as possible heat generations of the coils in a coil unit, by providing a fan rotating together with a crank shaft, and by utilizing the air blowing operation of the fan. CONSTITUTION:In a generator, a magnet 23 is moved in close proximity to the side face of a coil unit 40 while rotating around the coil unit 40 together with the rotation of a crank shaft 10, and an electric power is induced in the coil unit 40. In this case, a fan 30 is rotated together with the crank shaft 10, and the air is sent out on the side of the top surface of a coil mounting base 50, and further, the air is blown toward respective coils 42 in the coil unit 40 by the sidewall of the coil mounting base 50. The air passes the periphery of the coil unit 40, and a part of the air also is blown on the side of a cover 61 through an air blowing hole 24 which is provided in a magnet holding body 22. Further, the air is blown toward an air exhausting port 64 by the cover 61 and a cover 62, and the respective coils 42 included in the coil unit 40 are cooled forcedly. Therefore, even when the generator has a three-phase multipolar structure, the heat generations of the respective coils 42 in the coil unit 40 can be suppressed effectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a generator for generating electric power by utilizing the rotation of a flywheel attached to a crankshaft of an engine, and more particularly to a structure for cooling a coil for power generation.

[0002]

2. Description of the Related Art A coil unit in which a plurality of coils are arranged on a circumference around an axis of a crankshaft, and a magnet is fixed to a peripheral portion of the coil unit, and the magnet is rotated integrally with the crankshaft. Conventionally, a generator having a flywheel that moves along the outer periphery of the coil unit has been put into practical use. A generator of this type is attached to, for example, an outboard motor or an engine of a vehicle.

[0003]

By the way, recently, outboard motors and vehicles in which this type of generator is used are equipped with various electric components such as air conditioners, refrigerators, and radios that consume large amounts of power. Therefore, the load of the generator tends to increase.

Therefore, the coil unit is made to have a three-phase multi-pole structure to increase the power generation capacity. However, in that case, there is a restriction that the external shape of the generator cannot be increased.
The coil arrangement density inevitably increases in the coil unit.

The coil of the coil unit generates heat due to the load current, but when the coils are arranged at high density as described above, it becomes difficult to radiate the coil. Therefore, when the generator is used for a long time, the coil becomes hot and its life is shortened. Further, the insulating coating of the coil is broken and adjacent wires are short-circuited with each other, and as a result, the power generation output is reduced.

In view of such a situation, an object of the present invention is to provide a generator capable of suppressing heat generation of the coil of the coil unit as much as possible.

[0007]

According to the present invention, there is provided a coil unit having a plurality of coils arranged on a circumference centered on an axis of a crankshaft, and a magnet fixed to a peripheral portion thereof, which is integrated with the crankshaft. In a generator having a flywheel for rotating the magnet to move the magnet along the outer periphery of the coil unit, a fan for blowing air to the coil unit is attached to the crankshaft. There is.

[0008]

The fan rotates together with the crankshaft, and the coil of the coil unit is cooled by the blowing action of the fan accompanying this rotation.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a generator according to the present invention attached to an engine such as an outboard motor.

This generator has a flywheel 20 attached to an end of a crankshaft 10 of the engine.
And a fan 30 arranged to face the flywheel 20, and a coil unit 40 arranged between the flywheel 20 and the fan 30.

The flywheel 20 includes a bracket 21 fitted to an end of the crankshaft 10, a magnet holder 22 having an inner peripheral edge fixed to the peripheral edge of the bracket 21, and the holder 22. The magnet 23 is held.

The magnet holder 22 is bent in such a manner that its outer peripheral edge portion protrudes toward the outer peripheral side of the coil unit 40, and therefore its cross section is substantially U-shaped. The magnet 23 is fixed to the inner surface of the bent portion 22a so as to be located between the bent portion 22a of the magnet holder 22 and the coil unit 40.

As shown in FIG. 2, the fan 30 has a spline 10 provided on the peripheral surface of the crankshaft 10.
It is fitted to a and therefore rotates with the shaft 10.

As shown in FIG. 3, the coil unit 40 has a stator 41 having 18 poles formed on the outer periphery thereof.
And each of these poles is wound to form a stator coil 42 having 18 poles. The coil unit 40 is supported by a cylindrical coil mount 50 as shown in FIGS.

The coil mount 50 is mounted on the fan 30.
Are arranged concentrically with respect to the shaft 10 in such a manner as to surround the coil 10, and the coil unit 40 is fixed to the upper surface thereof by bolts 60. Further, as shown in FIG. 4, a large number of air discharge holes 51 arranged at equal intervals on the same circumference are formed through the upper surface of the coil mount 50.

The arrangement intervals of the air discharge holes 51 are set so that the holes 51 are located between the individual coils 42 of the coil unit 40.

As shown in FIG. 1, the flywheel 2
The block composed of 0 and the coil unit 40 is located in the space 63 defined by the covers 61 and 62 around its periphery. An air outlet 64 is provided at one end of the space.

Next, the operation of the present invention will be described.

In the generator of the above-mentioned embodiment, the magnet 23 causes the coil 4 to rotate as the crankshaft 10 rotates.
It orbits around 0, which induces power in coil 40.

At this time, the fan 30 is connected to the shaft 10
Along with this, air is sent to the upper surface side of the coil mount 50. Then, the air is guided to the air discharge holes 51 by the side wall of the coil mount 50 located around the fan 30, and then toward the coils 42 positioned above the air discharge holes 51. Is released.

The air discharged from the hole 51 passes around the coil 40, and a part of the air flows to the cover 61 side by the air circulation hole 24 provided in the magnet holder 22. The air passing around the coil 40 is guided toward the air discharge port 64 by the covers 61 and 62.

As described above, in this embodiment, since the coils 42 are forcibly air-cooled by the air discharged from the air discharge holes 51, the heat generation of the coils 42 during power generation is suppressed as much as possible. As a result, a decrease in power generation output due to heat damage to the insulating coating of the coil 42 and the coil 4
2 life reduction is prevented.

When the engine has a 4-cycle specification, it is necessary to transmit the rotational power of the crankshaft 10 to a camshaft (not shown) that opens and closes a valve for supply and exhaust.

In this case, as shown in FIG. 1, a pulley 65 is fixed to the shaft 10, and power is transmitted to the cam shaft via a timing belt 66 wound around the pulley 65.

[0026]

According to the present invention, the coil unit is cooled by the blowing action of the fan that rotates integrally with the crankshaft. Therefore, even when the coil unit has a three-phase multi-pole structure in order to increase the power generation output, heat generation of the coil of the coil unit is suppressed as much as possible, and as a result, output reduction due to damage to the insulating coating of the coil and The life of the coil is prevented from being shortened.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a generator according to the present invention.

FIG. 2 is a plan view showing the structure of a fan.

FIG. 3 is a plan view showing the structure of a coil unit.

FIG. 4 is a plan view showing the configuration of the upper surface of the coil mount.

[Explanation of symbols]

 10 ... Crankshaft 20 ... Flywheel 21 ... Bracket 22 ... Magnet holder 22a ... Bend 23 ... Magnet 30 ... Fan 40 ... Coil unit 41 ... Stator 42 ... Stator coil 50 ... Coil mount 51 ... Air release hole 61, 62 ... Cover

Claims (1)

[Claims] 1. A coil unit in which a plurality of coils are arranged on a circumference centered on an axis of a crankshaft,
A generator having a magnet fixed to a peripheral edge thereof, the flywheel rotating integrally with the crankshaft to move the magnet along an outer periphery of the coil unit, wherein the crankshaft has the coil. A generator equipped with a fan for blowing air to the unit.