JPS635425Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a magnet generator that serves both as an engine ignition and as a power source.

Conventionally, magnet generators that serve both as engine ignition and as a power source have been used in engines for motorcycles and agricultural machinery, and a well-known model is a flywheel type magneto generator. This is a magnetic generator that is made up of a magneto, which has the function of igniting the engine, and a generator, which serves as the power source for lighting headlights, taillights, etc. This lighting generator can be used to charge other power sources, such as batteries, and also for electric heaters. The magnetic generator of the present invention is a generator for both ignition and lighting, but has a non-flywheel structure, and is used by being directly connected to a small engine such as a lawn mower or chain saw. This type of small engine usually has only a magneto for ignition, but it may also have a generator function for lighting or other power sources. Structurally, as will be described later, in both the current model shown in Fig. 2 and the invented model shown in Fig. 1, there is a gap between the inside of the ignition coil 7 to which the rotor 6 is fixed and the outside of the armature 5. It is a magnet generator with an internal and external rotor.

More specifically, the magnetic circuit of the inner and outer rotor consists of permanent magnets, magnetic pole pieces, and a yoke, which are integrated by aluminum die-casting to constitute the rotor. Figure 2 shows the magnetic circuit of the current 10-pole magnetogenerator used in small chainsaw engines. In this magnetic path configuration, the magnetic path of the magneto for ignition has a permanent magnet 1 and a magnetic pole piece 2, and an ignition coil 7 shown above is fixed and installed with the magnetic pole pieces 2, 2 through an air gap. ing. As shown, the magnet 1 is magnetized into north and south poles. The magnetic path of the generator consists of six arc-shaped divided magnets 3 arranged in a ring, and has a yoke 4 on the back that serves as a magnetic path. The child 5 is fixed and installed concentrically with a gap in between. In other words, the magneto is an internal rotor, and the generator is an external rotor. Since this rotor is directly connected to the engine crankshaft and rotates, it generates the high voltage necessary for ignition and electric power for lighting or other power sources for the ignition coil and armature installed outside and inside, respectively, and the magneto and generator. It is designed to operate as a.

Therefore, in the magnetic circuit of the current model shown in Fig. 2, two magnetic poles are formed from the magnetic pole piece 2 on the magneto side, the divided magnet on the generator side is magnetized into eight poles in the radial direction as shown, and the two are combined. It consists of a 10-pole generator. Efforts have been made to utilize the magnetic path on the magneto side, but this magnetic path causes electromagnetic interference between the operations of the magneto and the generator. In such a magnetic configuration, the magnetic flux from the magneto side magnet also passes through the armature core of the generator, reducing the supply of magnetic flux to the ignition coil core. In other words, the leakage magnetic flux of the magneto magnetic path is large, resulting in a decrease in ignition performance. Moreover, when the generator is in operation, the effects of its armature reaction inevitably cause electromagnetic interference between the two to have a significant impact on the performance of the magneto and the generator.

For example, the ignition performance may vary greatly between when the generator is unloaded and when it is loaded.

The purpose of this invention is to propose a suitable magnetic path configuration that avoids such electromagnetic interference between the magneto and the generator as much as possible, and also brings about a magnetically advantageous synergistic effect between the magnetic paths of both. There is.

FIG. 1 is a concrete example of a 12-pole configuration showing the magnetic path configuration of the rotor of the present invention. The magnetic path on the magneto side is composed of a magnet 1 and a magnetic pole piece 2, which is the same as in the current one. The magnetic path of the generator is arranged in an annular manner with arc-shaped divided magnetic paths 3 (three in the figure, but can be taken as appropriate), and has a yoke 4 with a partial notch 4a on the back. This is a configuration in which a 12-pole armature 5 is fixed and installed concentrically with an air gap interposed therebetween. As shown, the cutout 4a of the yoke 4 is located at the magneto pole piece 2, and the magnet 3 is magnetized in the radial direction. If magnetized in this way, no magnetic pole will be created in the yoke, but
The back of the magnet in the notch forms a reverse polarity and faces the magneto pole piece 2 with a slight gap in between. As shown in the figure, this magnetic pole is magnetized to have the same polarity as the magnet 1, so that the magnetic flux from the magnet on the magneto side does not leak to the generator side magnetic path unlike the current model. Conversely, this magnetic pole configuration works to supply magnetic flux to the magneto side, and has the effect of increasing the effective magnetic flux of the magneto.

As described above, the magnetic path configuration of the rotor according to the present invention is preferable in that leakage magnetic flux on the magneto side is almost eliminated, and on the contrary, magnetic flux is supplied from the magnets from the generator. Furthermore, since the magneto magnetic pole piece faces a magnet with high magnetic resistance, electromagnetic interference between the two during operation can be extremely weakened. In particular, since this type of generator uses ferrite magnet material with high coercive force, the effect can be said to be increased.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional example. 1... Magneto side magnet, 2... Same as above magnetic pole piece,
3... Generator side magnet, 4... Yoke, 4a
...notch, 5...armature, 6...rotor, 7...
...Ignition coil.

Claims (1)

[Scope of utility model registration request] On the outer periphery of the fixed armature 5 having a radial-toothed multi-pole configuration, there is an annularly arranged arc-shaped segmented magnet 3, a yoke 4 having a notch 4a provided on the outer periphery of the segmented magnet 3, and a notch in the yoke 4. A rotor 6 is provided, which is made up of a magnet side magnet 1 and a magnetic pole piece 2, which is installed so as to maintain a slight gap from the outer periphery of the divided magnet 3 in the part 4a.
In a magnet generator having a rotor 6 that rotates while maintaining a gap between the outer periphery of the armature 5 and the outer periphery of the magnetic pole pieces 2, the outer periphery of the divided magnet 3 located in the notch 4a is arranged directly above the magnet. A magnet generator characterized in that the magnet 1 and the magnet piece 2 are magnetized with the same polarity corresponding to both the N and S pole parts.