JPH0135589Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnet generator with an ignition signal generator.

Magnet generators are sometimes installed in vehicles such as automobiles, and generally, in this type of magnet generator, a rotating field is formed by a magnet fixed to a rotor that is rotationally driven by an engine. It is configured to Therefore, the ignition signal for the engine may be obtained by utilizing the synchronized rotation of the magnet generator with the engine.

In such a magnet generator, if an attempt is made to generate an ignition signal using a magnet installed separately from the rotor magnet, noise due to leakage magnetic flux from the rotor magnet will enter the output waveform of the ignition signal. There was a drawback.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnet generator with an ignition signal generator that can prevent noise from intervening in the ignition signal waveform due to leakage magnetic flux from the magnets of the rotor.

In order to achieve this purpose, the present invention arranges the signal generating coil so that it does not interlink with the magnetic flux of the rotor magnet, and also inserts an iron core with a magnet at one end into this coil. A timing member that rotates integrally with the rotor is configured to pass near the end, and changes in the amount of magnetic flux generated in the core of the coil as the rotating timing member passes are affected by the leakage magnetic flux of the rotor magnet. By making it so that superpower is not generated as an ignition signal in the coil, the generation of superpower as an ignition signal depends only on the correlation between the iron core and the timing member.

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is a perspective view showing an embodiment of a magnet generator with an ignition signal generator according to the present invention, and FIGS. 2 and 3 are a schematic plan view and a schematic side sectional view of the principle.

In this embodiment, this magnet generator is equipped with a frame 1 formed in a substantially disk shape, and a center of this frame 1 is rotatably driven directly or indirectly by an engine (not shown). A shaft 2 is supported. A rotor 3 for forming a rotating field is fixed to one end of the shaft 2, and a plurality of rotors (four in this embodiment) are arranged on the outer periphery of a core 4 made of a magnetic material. ) are arranged with an equal phase difference, and adjacent magnets are separated from each other by a non-magnetic material and held fixedly. Adjacent magnets 5 have different magnetic poles, and the magnetic flux is set to be parallel to the upper surface of the frame 1 as much as possible.

A stator 6 for generating superpower is provided outside the rotor 3 on the frame 1. This stator 6 includes a plurality (two in this embodiment) of stator cores 7 made of roughly square-shaped thin iron plates stacked in a roughly channel shape, and each core 7 has a notch 7.
a are respectively opposed to the rotor 3, arranged symmetrically with each other, and fixed parallel to the upper surface of the frame 1. A stator coil 8 is wound on a spool 9 around the core 7, and although not shown, the coil 8 is connected to a battery or other arbitrary load as appropriate. The magnetic fluxes of the coil 8 and the rotor magnet 5 are set to interlink as truely (at right angles) as possible, so that the stator core 7 has a pair of notches 7a, 7a with different magnetic poles. Adjacent magnet 5,
5 are configured to form a magnetic path of the magnets when they face each other.

An ignition signal generating device 10 is attached to this magnet generator, which device is equipped with a coil 11 for generating the ignition signal. This coil 11 is wound around a spool 12, and is fitted into a case 13 which is made of a ferromagnetic material and serves as a magnetic shield cover. Inside the winding cylinder of the spool 12, an iron core 14 formed of a magnetic material into a substantially two-step cylindrical shape is provided.
are inserted concentrically. Inside the case 13, a magnet 1 for signal generation is installed at one end of the iron core 14.
5 are in contact with each other, and the end face of the case 13 is closed by being covered with a cap 13a made of the same material as the case 13. The other end surface 13b of the case 13 is open and is configured to be flush with the other end surface of the iron core 14 and the end surface of the spool 12.

In a state where the spool, coil, iron core, and magnet are accommodated, the magnetic shield case 13 is located adjacent to the adjacent stator cores 7, and is located at the rotor 3.
The opening surface 13b is arranged at one place spaced apart from the
It is installed on the frame 1 with the iron core 14 facing away from the frame and positioned so that it is parallel to the rotor axis. In this installed state, the magnetic fluxes of the signal generating coil 11 and the rotor magnet 5 are in a relationship that does not interlink with each other in a true manner (the loops are parallel).

The ignition signal generator 10 also includes a timing member 16 formed from a magnetic material into a substantially rectangular plate shape, and one end of the timing member 16 is brought into contact with the rotor 3 and fastened by a fastener 17. It is attached so that it rotates together with the rotor. A balancer 16a is formed at the rear end of the timing member 16, and the free end of the timing member 16 is connected to the opening surface 13 of the magnetic shield case 13.
b with appropriate clearance.

Next, the effect will be explained.

When the rotor 3 is rotated by the engine, the magnetic flux acting on the stator core 7, that is, the stator coil 8, changes due to the rotating field of the magnet 5, and an electromotive force is generated in the stator coil 8. This electromotive force is charged into a battery or supplied as power to other electrical components.

On the other hand, when one end of the iron core 14 of the signal generating coil 11 and the tip of the timing member 16 of the rotor face each other as the rotor 3 rotates, the iron core 14
The amount of magnetic flux due to the signal generating magnet 15 increases, and when one end of the iron core 14 and the tip of the timing member 16 are shifted from each other, the amount of magnetic flux decreases.
Therefore, as the rotor 3 rotates, the magnetic flux within the signal generating coil 11 changes, so that the coil 11
An electromotive force is generated. This electromotive force is output as an ignition signal, and the primary current of the ignition coil is cut off or applied through a predetermined circuit, causing a spark to fly from the ignition plug and igniting the engine.

In the ignition signal generation operation, for example, as shown in FIG. 2, when the rotor magnet 5 moves into the gap between adjacent stator cores 7 and faces the signal generation coil 11, the There is a risk that the magnetic flux leaks from the gap between the cores, generates an electromotive force in the signal generating coil 11, and disturbs the signal generating magnetic flux.
The superpower due to this leakage magnetic flux is generated by the signal generating coil 11.
This enters the output waveform of the ignition signal and becomes noise (disturbance of the signal-generating magnetic flux), which adversely affects the ignition operation in the engine and reduces engine performance.

However, in the ignition signal generating device having the above configuration, the magnetic flux of the rotor magnet 5 and the signal generating coil 11 are set in a non-interlinked relationship with each other, and moreover, the signal generating coil 11 is connected to the magnetic shielding case 1.
3, the iron core 14 is magnetically shielded except for the portion facing the timing member 16, so there is no fear that leakage magnetic flux from the rotor magnet 5 will generate an electromotive force in the signal generating coil 11. do not have. Therefore, noise due to leakage magnetic flux does not interfere with the output waveform, and an ignition signal with a good signal-to-noise ratio can be obtained from the signal generating coil.

Furthermore, in the ignition signal generation device, a single ignition signal is generated from the coil 11 for each turn of the timing member 16 regardless of the number of magnetic poles of the magnet 5 in the rotor 3, so that it is installed in a four-cycle engine. It is convenient to apply to magnet generators.

It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the gist thereof.

For example, although the case has been described in which the present invention is applied to a rotor-internal rotor type magnet generator, the present invention can also be applied to a rotor-outer rotor type magnet generator.

Further, the number of poles of the rotor magnet, the number of poles of the stator coil, the number and structure of the signal generating coil and timing member, etc. are not limited to those in the above embodiments.

As explained above, according to the present invention, the signal generating coil is provided so as not to interlink with the rotating field of the rotor, an iron core having a magnet at one end is inserted into the coil, and the vicinity of the other end of the iron core is inserted into the coil. By configuring it so that the timing member that rotates integrally with the rotor passes through it, the influence of the rotating field on the signal generating coil can be avoided, and changes in the amount of magnetic flux in the coil's core can be determined only by the correlation between the core and the timing member. Therefore, it is possible to obtain an ignition signal with a good signal-to-noise ratio.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure and FIG. 3 are a schematic plan view and a schematic side sectional view. 1... Frame, 2... Rotating shaft, 3... Rotor, 4... Core, 5... Magnet, 6... Stator, 7
...Stator core, 8...Stator coil, 9...
...Spool, 10...Ignition signal generator, 11...
...Signal generating coil, 12...Spool, 13...
Magnetic shield case (magnetic shield cover), 1
4...Iron core, 15...Signal generation magnet, 16...
timing parts.

Claims (1)

[Claims for Utility Model Registration] A rotating rotor 3 in which a plurality of magnets 5 are arranged and fixed at equal intervals on the outer periphery of a core 4 made of a magnetic material, and the rotor 3 is placed outside the core 4. The stator 6 has a stator coil 8 which is arranged to surround the rotor 3 and interlinks with the magnetic flux of the magnet 5 of the rotor 3.
In the magnet generator with an ignition signal generator equipped with ,and,
A signal generating coil 11 arranged in a non-linkage relationship with respect to the magnet 5 of the rotor 3, and a signal generating coil 11 inserted into the center of the spool 12, with a magnet 15 in contact with one end. a magnetic shield cover 13 configured to cover the signal generating coil 11 with only the end face of the iron core 14 opposite to the magnet 15 open; and a magnetic shield cover 13 formed of a magnetic material into a rectangular plate shape. rotates integrally with the rotor 3, and one end thereof is connected to the iron core 14.
a timing member 16 that is disposed so as to pass near an end surface on the opposite side to the magnet 15 in the axial direction of the timing member 16 and has a balancer 16a formed at the other end thereof. Magnet generator with ignition signal generator.