JPH0421069B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multi-pole magnet generator for a non-contact ignition device for an internal combustion engine.

[Prior art]

In conventionally well-known devices of this kind, an ignition signal generator was separately provided to obtain the ignition signal, but the ignition signal generator is expensive, requires installation space, and is difficult to install. It was necessary to perform positioning with high precision, which required a lot of man-hours.

Therefore, as shown in Special Publication No. 49-46163,
A core with many salient poles is formed, and the coil is divided and wound around every single salient pole, and these divided windings are connected in series by making the number of turns the same and changing the winding direction, and can be used as a magnet rotor. The idea is to obtain one ignition spark per rotation of the magnet rotor by using a device in which a magnetic change appears in most of the circumferential direction, but a part with no magnetic change. It is being

However, in the conventional method described above, the voltages of opposite polarity generated in the divided coils are canceled out and the output voltage in unnecessary parts is reduced to zero, so this coil is used for capacitor charging. When used as a coil, there was a drawback that a large no-load voltage of several kilovolts was generated in both divided parts of the coil in the high-speed rotation range, which could cause dielectric breakdown of the coil.

[Purpose of the invention]

In order to solve the above-mentioned drawbacks, the present invention aims to solve the problem of two adjacent
By winding an ignition power supply coil such as a capacitor charging coil across the two salient poles and reducing the output voltage in unnecessary parts to zero by canceling out the flux, a large no-load voltage can be achieved even in the high-speed rotation range. The aim is to be able to cause one ignition per rotation without causing any ignition.

〔Example〕

The present invention will be described below with reference to the embodiment shown in the drawings. In FIG. 1, reference numeral 1 denotes an iron bowl made of a magnetic material, which is directly connected to a cranker shaft of an internal combustion engine and driven to rotate. 2 is a generally ring-shaped magnet placed and fixed on the inner periphery of the iron bowl 1, and is magnetized in the radial direction; 2a to 2e are magnetized so that the N pole is generated on the inner diameter side; Until now, it is magnetized so that S and N poles occur alternately,
Consecutive 5 out of 12 poles magnetized as a whole
The poles are magnetized to the same polarity. 3 is a star-shaped core made of laminated magnetic iron plates, and has 12 salient poles 3a to 3l formed at approximately equal intervals that protrude outward in the radial direction, of which 3a and 3b are protrusions for charging a capacitor. The poles 3c to 3l are output salient poles for lighting or battery charging. 4 is a capacitor charging coil wound across two adjacent salient poles 3a and 3b, one end of which is connected to the capacitor 11 via a diode 10 as shown in FIG. 2, and the other end is grounded. There is. Therefore, the magnetic pole spacing between the two adjacent salient poles 3a and 3b around which the capacitor charging coil 4 is wound is approximately equal to the magnetic pole spacing of the magnet 2. In addition, each of the remaining protrusions 3c to 3l
A coil 5 for lighting or battery charging is wound around and connected in series with each other. Further, the outer circumferential surface of each of the salient poles 3a to 3l is opposed to the inner circumferential surface of the magnet 2 with a small gap therebetween. 6 is a screw for tightening and fixing the core 3 to the side wall of the internal combustion engine.

Figure 2 is a circuit diagram showing the capacitor charging coil 4.
When a positive direction voltage D ₁ is generated, the other end 4 of the capacitor charging coil 4 is generated from one end 4 a of the positive voltage D 1 through the diode 10 , the capacitor 11 , the primary coil 16 a of the ignition coil 16 , the diode 14 , and the ground.
A current flows in the order of b, forming a circuit that charges the capacitor 11. When a negative voltage D ₂ is generated in the coil 4, a current flows from the other end 4b through the ground, the gate of the thyristor 12, the cathode of the thyristor 12, and the diode 15 to the one end 4a of the capacitor charging coil 4. , forming a circuit that turns on the thyristor 12.
Here, when the thyristor 12 is turned ON, the electric charge stored in the capacitor 11 is transferred to the thyristor 12.
The primary coil 16a of the ignition coil 16 is suddenly discharged through the ignition coil 16, a high voltage is generated in the secondary coil 16b, and the ignition plug 17 is ignited. In addition, resistance 1
3 is a resistor for adjusting the ignition timing. Moreover, FIG. 3 shows the waveforms of various parts in the above configuration, where A is the waveform of flux through the salient pole 3a;
B is a flux waveform passing through the salient pole 3b, C is a flux waveform obtained by adding these two flux waveforms and interlinks with the capacitor charging coil 4, and D is a voltage waveform generated in the capacitor charging coil 4.

In the above configuration, the capacitor charging coil 4
is wound without being divided, spanning two adjacent salient poles 3a and 3b, and these two salient poles 3a and 3b are wound without being divided.
The magnetic pole spacing of magnets a and 3b is approximately equal to the magnetic pole spacing of magnet 2, and these two salient poles 3a and 3b
When facing the alternately magnetized portions 2f to 2l, the flux passing through one salient pole 3a (the third
Figure A) and the flux passing through the other salient pole 3b (the third
(B) are completely opposite to each other and cancel each other out, so that the section _T2 in FIG. 3 is equivalent to no flux interlinking with the capacitor charging coil 4 as shown in FIG. 3C. In addition, in the parts 2a to 2e where the magnets 2 are connected and magnetized to the N pole,
Flux passing through one salient pole 3a and the other salient pole 3
The fluxes passing through b are in the same direction, and these two fluxes are added to the capacitor charging coil 4. During section _T1 , a large amount of flux interlinks as shown in Fig. 3C, and as a result, as shown in Fig. 3D. As shown, a positive direction voltage D ₁ and a negative direction voltage D ₂ are generated, and among these, the positive direction voltage D ₁ is applied to the capacitor 11
is charged, and a negative direction voltage D ₂ is applied to the thyristor 12 as a gate signal.

In this example, the part where the magnet is continuously magnetized to the N pole is set to 5 poles, but the number of poles can be changed arbitrarily from 2 to 9 depending on the ignition timing, the required value of the capacitor voltage, etc. You can change it. Furthermore, the same effect can be obtained whether the continuously magnetized portions are N-pole or S-pole. Further, in the above embodiment, the total number of poles was 12, but any number of poles may be used as long as the generator has four or more poles. however,
In the case of an odd number of poles, the output becomes small, so it is preferable to use an even number of poles.

In addition, as shown in FIG. 1, two adjacent salient poles 3a and 3b around which the capacitor charging coil 4 is wound
By forming the coil winding portions to extend parallel to each other in close proximity to each other, the amount of wire rod used in the coil 4 can be reduced, and both salient poles 3
The distance between salient poles 3c and 3l on both sides of a and 3b is widened, and the winding space of the coil 4 can be widened.

Further, in the above-described embodiment, the negative direction output of the capacitor charging coil 4 was used as the ignition signal, but it is also possible to wind a signal coil around one of the salient poles 3a to 3l of the core 3, or to A signal coil may be wound around the poles 3a and 3b in the same manner as the capacitor charging coil 4, and the output of the signal coil may be used as an ignition signal to control the thyristor 12.

Moreover, as shown in FIG. 4, two adjacent salient poles 3a,
By providing a plurality of capacitor charging coils 4, 4' wound across 3b, 3a', and 3b', the present invention can be applied to a multi-cylinder ignition system.

Also, as shown in Fig. 5, two adjacent salient poles 3a, 3
If two capacitor charging coils 4, 4'' wound across 3a'' and 3b'' are arranged adjacent to each other and connected in a harmonic manner, the capacitor voltage can be doubled.

In each of the embodiments described above, the present invention was applied to a capacitor discharge type ignition device, but it is also possible to directly intermittent the output voltage generated in the ignition power supply coil by a transistor without using a charging/discharging capacitor. The present invention can also be applied to a transistor type ignition device that induces a high voltage in an ignition coil.

〔Effect of the invention〕

As described above, in the present invention, an ignition power supply coil is wound across two adjacent salient poles of a core having a plurality of salient poles protruding at approximately equal intervals in the radial direction. By making the magnetic pole spacing of two adjacent salient poles wound with the magnetic rotor approximately equal to the magnetic pole spacing of the magnetic rotor, in the area where magnetic changes of the magnetic rotor appear, the adjacent salient poles wound with the ignition power source coil are In the part where the fluxes of the two salient poles cancel each other out and there is no magnetic change, the fluxes of each of the two salient poles are added together, so that a flux change corresponding to the two poles appears in the ignition power supply coil wound together with the two poles. Therefore, by reducing the output voltage in unnecessary parts of the ignition power supply coil to zero by canceling the flux, no large no-load voltage is generated even in the high-speed rotation range, and the output voltage is reduced once per rotation of the magnet generator. It has the excellent effect of being able to ignite.

[Brief explanation of drawings]

Fig. 1 is a partially sectional plan view showing one embodiment of the generator of the present invention, Fig. 2 is an electric circuit diagram of an ignition device to which the generator shown in Fig. 1 is applied, and Fig. 3 is an explanation of the operation of the above embodiment. The waveform diagrams of various parts and FIGS. 4 and 5 are partial sectional plan views showing two other embodiments of the generator of the present invention. 1, 2...The iron bowl and magnets that make up the magnet rotor,
3...Core, 3a to 3l, 3a', 3a'', 3b', 3
b″... Salient pole, 4, 4', 4″... Capacitor charging coil forming the ignition power supply coil, 5... Coil for lighting or battery charging.

Claims (1)

[Scope of Claims] 1. A core having a plurality of salient poles protruding at approximately equal intervals in the radial direction, an ignition power source coil wound across two adjacent ends of the core, and another end of the core. A stator equipped with a wire-wound lighting or battery charging coil, and radially magnetized magnets arranged circumferentially to form a nearly cylindrical shape, with magnetic changes appearing in most of the circumferential direction. However, the rotor is composed of a magnet rotor having a large number of magnetic poles arranged so that a part with no magnetic change appears, and the magnetic pole spacing between two adjacent salient poles around which the ignition power supply coil is wound is determined by the magnet rotor. A multi-pole magnet generator for use in internal combustion engine non-contact ignition systems, with the spacing between the magnetic poles of the rotor approximately equal to that of the rotor. 2. A multipole magnet for an internal combustion engine contactless ignition device according to claim 1, wherein coil winding portions of two adjacent salient poles around which the ignition power supply coil is wound are formed close to each other. Generator.