JPH034152Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in generators for automobiles.

Generally, when it comes to alternator-type or dynamo-type generators installed in automobiles, it is undeniable that leakage magnetic flux is generated from the stator and rotor portions of the alternator-type or dynamo-type generator. When mounting a compass or other instrument that displays the relative relationship with the direction of travel, there is a problem in that the magnetic field due to the leakage magnetic flux of the generator is applied to the geomagnetic sensor, causing the instrument to go awry.

In order to prevent the leakage magnetic flux from the generator from having an adverse effect on the compass, etc., it is necessary to implement magnetic shielding means, but in the past, the generator was directly connected to the engine or vehicle body, which is held at ground potential. Since the so-called single-wire wiring is used to connect the generator to the generator and connect it to the ground through the body (bracket), the leakage magnetic flux is transmitted to the engine, making it impossible to magnetically shield only the generator.

In addition, if the generator is body grounded to the engine or vehicle body side and connected to single-wire wiring as in the past, a closed loop is formed when current flows through that wiring and the engine. The drawback is that the magnetic field generated by the closed loop has an adverse effect on the geomagnetic sensor of the compass.

Furthermore, regardless of whether it is an alternator type or a dynamo type, the rectified output of the generator contains high-frequency components due to pulsating flow, and the closed loop created by the harness when using the single-wire wiring described above acts as a loop antenna. There is a problem in that noise radio waves are mixed into the in-vehicle radio equipment.

This idea was created taking the above points into consideration.
The present invention provides an automobile generator that takes measures to prevent the generation of magnetic and electrical noise.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the case of the automobile generator according to the present invention, the main body of the generator is not wired in a single-wire system using a body ground as in the past, but is wired in a double-wire system as shown in Fig. 1. The E terminals on the negative side between the generator main body G, battery BAT, and regulator REG are connected to each other using a dedicated ground wire. In the diagram, IG・SW
indicates the ignition switch, and LOAD indicates the load connected to the regulator REG. In addition, when using an alternator type generator as shown in the figure, if the E terminal side is not grounded to the body through its bracket, the heat of the radiation plate (provided on the negative side) of the semiconductor rectifier built into the generator body G will be generated. However, it has become necessary to use an object with poor thermal conductivity called an electrical insulator between the negative side of the generator body G and the bracket (the negative side (The same conditions are required for the E terminal on the positive side as for the B terminal on the positive side.) Since the radiation effect is reduced, it is necessary to make the radiation plate larger.

Figures 2a and b show the structures of the positive side B terminal and negative side E terminal of the improved generator main body G.As with the B terminal, the E terminal also has an insulator 1, The bracket 3 is electrically insulated from the bracket 3 via the bracket 2.

Therefore, by electrically insulating both the positive and negative output terminals from the bracket and pulling them out, it is easy to magnetically shield only the generator when installing it on the engine or vehicle body. This makes it possible to suppress the leakage magnetic flux of the generator and prevent it from having an adverse effect on instruments such as the geomagnetic sensor of the compass.

Also, by wiring the positive and negative wires in close proximity or together, it is possible to prevent the formation of a closed loop, which creates a magnetic field even when current flows through the harness. It is also possible to prevent noise radio waves from being radiated from the harness as a loop antenna.

Furthermore, in the case of the present invention, in the generator main body G, in which both the positive side B terminal and the negative side E terminal are electrically insulated and pulled out from the bracket 3, as shown in Fig. 3 a, b, and c, respectively. As shown, a ground terminal EA that is grounded through the bracket 3 is provided separately, and capacitors C1 and C are connected between the EA terminal and the B and E terminals, respectively.
2 (a in the same figure), or connect capacitor C1 between the EA and B terminals, and capacitor C2 between the B and E terminals (in the same figure).
B), or a capacitor C1 between the B and E terminals, and a capacitor C between the EA and B terminals.
2 are connected to each other (C in the same figure).
In addition, if the body is not grounded to the engine or the vehicle body through the bracket 3, a ground terminal EA grounded to the engine or the vehicle body may be provided separately. However, in this case, it is necessary to provide the EA terminal near the generator main body G. In addition, the internal structure of the generator body G is omitted in the figure, and the electrical connection relationship between the B terminal, E terminal, and EA terminal and the bracket 3 is shown.

Therefore, in the automobile generator according to the present invention configured as described above, high frequency components included in the rectified output of the generator main body G are transmitted through the capacitors C1 and C2 to the B terminal on the positive side and the terminal B on the negative side. E terminal is in bracket 3
(or directly) to the engine or vehicle body side, so the high frequency components in the rectified output are not supplied to the loop antenna by the harness, and therefore noise radio waves are radiated from the generator body G. Things will go away.

FIG. 4 shows the appearance of the automotive generator according to the present invention, in which a positive B terminal 4 and a negative E terminal 5 are provided on the front surface of the bracket 3 of the generator main body G via an insulator 1, respectively. Further, an EA terminal 6 is provided directly on the side of the bracket 3, and capacitors C1 and C2 are connected to both ends of the EA terminal 6 via a conductive clamp 7.
are mounted in electrical contact by an outer metal case forming one pole, and each capacitor C
1, connect the lead wire of the other pole of C2 to B terminal 4 and E
By connecting them to the terminals 5, the circuit shown in FIG. 3a is constructed. Figure 5 also shows a capacitor C1 with lead wires drawn out from both poles and electrically insulated from the outer case, and a capacitor C2 with the outer metal case forming one pole and a lead wire drawn out from the other pole. The circuit shown in FIG. 3c is shown in FIG.

As described above, in the automotive generator according to the present invention, both the positive and negative output terminals are electrically insulated from the bracket via an insulator and pulled out, and a ground terminal is separately provided.
A capacitor is connected between the ground terminal and each of the positive and negative output terminals, or between both output terminals, or between the ground terminal and either output terminal. It has the excellent advantage of being able to effectively prevent the generation of electrical noise.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the double-wire wiring system of the generator, and FIGS. 2a and 2b are front sectional views showing the structure of each output terminal on the positive side and negative side of the main body of the generator according to the present invention, 3a, b, and c are electrical wiring diagrams showing the electrical connection states of the generator according to an embodiment of the present invention, FIG. 4 is a side view showing the external appearance of the generator according to an embodiment of the present invention, and FIG. FIG. 5 is a diagram showing another connection state of the capacitor. 1, 2... Insulator, 3... Bracket, 4...
Positive side B terminal, 5... Negative side E terminal, 6...
...Earth EA terminal, 7...Clamp.

Claims (1)

[Scope of utility model registration request] Both the positive and negative output terminals are electrically insulated and pulled out from the bracket, and a separate ground terminal is provided, and the output terminal is connected between the ground terminal and each output terminal, or between the output terminals and the ground terminal. An automotive generator with a capacitor connected between each terminal.