JPS6369451A - Generation set - Google Patents

Abstract

PURPOSE:To obtain a small-sized and light-weight engine generation set, by constituting an induction generator as a generator and making it of an outer- pole type so as to give a flywheel effect in a positioning relationship of a rotor with a stator. CONSTITUTION:An ignition magnet 1-1 is embedded into the outside circumference of aluminium cylindrical section in a rotor 1 of an outer-pole type induction generator driven by an engine. An ignition winding 3 is arranged to set up voltage for engine ignition in the opposite position of a magnet 1-1. When the engine rotates, the rotor 1 fixed to the shaft 4 of the engine rotates accordingly and the voltage induced to a stator coil 2-1 is taken out with a leader line 2-4. On the other hand, when the ignition magnet 1-1 passes under the ignition winding 3, voltage is set up across the ignition winding 3. A disc body for flywheel is hereby dispensed with, so that the voltage available has no distortion in wave form and less fluctuation.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to the structure of a generator driven by an engine.

[Conventional technology]

Conventionally, in devices that use an engine as a prime mover to drive a generator to generate electricity, a part that generates the voltage for igniting the engine is often provided independently from the generator.

That is, a disc-shaped body is attached to the shaft of the engine, and magnets are embedded in appropriate locations on the circumferential surface of the disc-shaped body, while facing the magnets at positions slightly outward from the circumferential surface of the disc-shaped body. In this way, an ignition wire was installed that detects the magnetic flux of the magnet and generates a voltage. When the disk rotates as the engine rotates, a magnet attached to the disk generates a voltage as it passes under the ignition winding. This is used as the engine's ignition voltage. The ignition voltage of the engine must be generated in synchronization with the rotation of the engine, but since the disc-shaped body rotates with the rotation of the engine, the voltage is synchronized with the rotation of the engine. . Note that, considering its structure, the disc-shaped body naturally also functions as a flywheel.

On the other hand, the rotor of the generator is attached to the shaft of the engine and driven separately from the disc-shaped body.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, a disc-shaped body must be provided separately from the generator as a device for generating the ignition voltage for the engine, which has the problem of complicating manufacturing operations. Furthermore, since it was necessary to secure enough space for the disc-shaped body to rotate without any trouble, the engine generator became larger accordingly. However, one of the selling points is that it can be easily carried and used anywhere, and the existence of this disc-shaped body takes up space, especially for engine generators where compactness and weight reduction are particularly strongly desired. , which was one problem that hindered this.

[Means for solving problems]

In order to solve the above problems, in the present invention, an induction generator configuration is adopted as the generator, and the positional relationship between the rotor and the stator is such that a flywheel effect is created.
It was of the abductor type. The parts of the rotor structure other than the iron core were cast and molded from aluminum. Furthermore, ignition magnets were embedded in appropriate locations on the rotor surface during aluminum casting.

〔Example〕

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a perspective view of an embodiment of the present invention.
1 is a partial cross-sectional view of an embodiment of the present invention. In the figure, 1 is a rotor, 1-1 is an ignition magneto 1-. 1-2 is the rotor core, 1-3 is the end ring, 1-4 is the fan, ■-5 is the rotor conductor, 1-6 is the rotor bottom, 2 is the stator, 2-1 is the stator coil, 2-2 is the stator core, and 2-3 is the stator fixing bolt.

2-4, the lead wire 23 is an ignition winding, and 4 is a shaft.

5 is the engine barrel.

In the present invention, an epidermal induction generator is adopted as the engine-driven generator (the reason will be explained in detail later), so the rotor is a bottomed cylindrical rotor as shown in Fig. 1. It becomes 1. An ignition magnet 1-1 is embedded in the circumferential surface of the rotor 1.

FIG. 2 shows a partial sectional view of the upper half of the shaft from the center. As mentioned above, the rotor 1 is fixed to the shaft 4 of the engine. Stator 2 is stator fixing port 2
-3 to the engine barrel 5.

The rotor 1 has a rotor core 1-2, rotor conductors 1- and 5 in the slots of the rotor core 1-2, and a corresponding one of each rotor conductor 1-5 to form a cage-shaped rotor. A terminal ring 1-3 that short-circuits the ends together in a ring shape, a rotor bottom 1-6, a fan 1-4 extending from the terminal ring 1-3 located at the open end of the rotor, and a rotor. The ignition magnet 1-1 is embedded in the peripheral surface of the ignition magnet 1-1. When manufacturing the rotor 1, if the magnet I-1-1 for the rotor core 1-2 is embedded in the end ring 1-3, it can be formed integrally at the same time as aluminum is cast, thereby simplifying the manufacturing process. Not only is it a cylindrical part, but it is also firmly fixed mechanically and can withstand the large centrifugal force that accompanies rotation. On the other hand, the stator 2 includes a stator core 2-2 and a stator coil 2-1 housed in a slot thereof. Stator coil 2-
A lead wire 2-4 is drawn out from the power supply 1 to take out the generated voltage to the outside.

The generator configured as described above operates as follows when the engine rotates. First, the rotor 1 fixed to the shaft 4 of the engine rotates. Then, a voltage is induced in the stator coil 2-1 due to the induction effect.

This voltage is taken out by the lead wire 2-4. on the other hand,
When the rotor 1 rotates and the ignition magnet 1-1-1 passes under the ignition winding 3, the ignition winding 3 generates a voltage.

Since the rotor 1 is fixed to the engine shaft and rotated by the engine, this voltage L+
'/ , ';'/ j)■1 Hatanji I= r'3 M
n l J= 4.77% L? -IA
I) It? It can be used for ignition.

Next, I will explain why we adopted an external rotor type generator and embedded an ignition magnet in its rotor.

The first reason for using an epidermal type is that it is advantageous in terms of flywheel effect. In small power generators equipped with 4-stroke engines, etc., the flywheel effect is small, resulting in uneven rotation.

As a result, when a lamp was connected as a load, the lamp would flicker, and when a motor was connected, the motor would rotate irregularly. In order to avoid this, measures must be taken to increase the flywheel effect. An external rotor type generator has a rotor that rotates at a larger radius than an internal rotor type generator, and this rotor itself already has a flywheel effect.

The second reason for using the external rotary type is that the ignition magnet can be attached without adversely affecting others. If an internal rotor type starter is used and the ignition magnet 7) is attached to the circumferential surface of the rotor, the ignition magnet 7) will naturally be attached at a position facing the stator. In this case, the magnetic flux of the ignition magnet disturbs the main magnetic flux of the generator, causing so-called magnetic path interference. Furthermore, since the winding for power generation is installed at a position facing the stator, there is also the problem that if an ignition magnet is provided here, the space for the winding will be sacrificed. If an external rotor type is adopted and the ignition magnet is embedded in the outer circumferential surface, rather than the inner circumferential surface facing the stator, the above-mentioned problems will not arise.

There are many types of external rotor generators, but the reason we chose an induction generator is as follows.

First, voltage fluctuations can be reduced. In an induction generator, voltage fluctuations due to load fluctuations can be reduced by appropriately adjusting the capacitor for supplying phase-advanced current.

The second is that there is no waveform distortion. Induction generators do not have waveform distortion due to armature reaction, so a voltage with a clean waveform can be obtained. Third, the rotor can be made by casting aluminum. As is well known, the rotor of an induction generator can be a cage-shaped rotor, and when it is formed, it can be formed by casting aluminum by a die-casting method or the like.

Therefore, the ignition magnet can be embedded in the outer periphery of the end ring of the cage-shaped rotor at the same time as the cage-shaped rotor is molded, and there is no need for a separate embedding operation.

〔Effect of the invention〕

According to the present invention as described above, there is no need to carry out a separate work for attaching the ignition magnet, and there is no need for a disc-shaped body for the flywheel. Furthermore, the ignition magnet does not disturb the main magnetic flux of the generator and interfere with the magnetic path, nor does it narrow the space for the windings. Furthermore, you can get a good quality one that does not fluctuate much.

[Brief explanation of the drawing]

FIG. 1: A perspective view of an embodiment of the present invention. FIG. 2: A partial sectional view of an embodiment of the present invention.
1 is the rotor, 1-1 is the ignition magnet), and 1-2 is the rotor core. l-3 is an end ring. 1-4 is a fan, 1-5 is a rotor conductor. 1-6 is the rotor bottom, 2 is the stator, and 2-1 is the stator coil. 2-2 is the stator core. 2-3 is the stator fixing bolt. 2-4 is the leader line. 3 is the ignition winding. 4 is the shaft. 5 is the engine barrel. Patent applicant: Sawafuji Electric Co., Ltd.

Claims (1)

[Claims] In a power generation device having a generator driven by an engine, the generator is an epidermal induction generator, and the rotor of the induction generator includes an iron core and a cylindrical portion made of aluminum. In addition, an ignition magnet for generating an engine ignition voltage is embedded in the outer periphery of the aluminum cylindrical portion of the rotor, and an ignition winding for generating the engine ignition voltage is located at a position facing the magnet. A power generation device characterized by an arrangement of wires.