JPH11252845A - Ac generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain desired output characteristics at a low cost by forming electronic winding out of a plurality of types of coils where either of the diameter of a coil or the number of turns is different, and parallel-connecting the respective coils for outputting through a rectifier respectively. SOLUTION: This electronic winding is comprised of two types of coils; or the first and second coils 9, 10. The coil diameter of the first coil 9 is larger and the number of its turns is smaller than that of the second coil 10. The first coil 9 is wound at the half periphery part of a stator core, and the second coil 10 is wound at the other half periphery part of the stator core. The lead wire drawn from the respective ends of the first and second coils 9, 10 is led to a rectifier 11, and its current is converted into DC to be outputted to a battery 12. The respective coils 9, 10 are connected to the other rectifier, respectively, and the output current form the rectifier 11 becomes a combination of the respective output currents of the first and second coils 9, 10. It is thus possible to attain desired output characteristics at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention belongs to the technical field of an AC generator mounted on a vehicle or the like.

[0002]

2. Description of the Related Art In general, among such AC generators,
Some rotors have a permanent magnet as a field pole, while others have an armature winding that generates an AC voltage.However, in such an AC generator, the rotor speed and output current The output characteristic showing the relationship between
It is represented as shown by The output characteristics change depending on the winding specifications of the armature coil, the dimensions of the stator core, the permanent magnet, and the like.

[0003]

By the way, the above-mentioned conventional alternator is required to have various output characteristics depending on the application or the like. In order to correspond to these required output characteristics, respectively, the stator core, If the size of the permanent magnet is changed, the design of other parts must be changed, which causes a problem that the cost is increased. On the other hand, it is relatively easy to change the output characteristics by changing the number of turns of the armature coil. However, for example, in the case where the required output characteristic is indicated by a dotted line F with respect to the output characteristic indicated by the solid line E in FIG. The problem is that the output current decreases in the rotation speed range, and if the number of coil turns is reduced to increase the output current in the high rotation speed range, the output current decreases in the low rotation speed range and the required output characteristics are not achieved. There is a problem to be solved by the present invention.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made for the purpose of solving these problems. One is composed of a plurality of different types of coils, and each coil is connected in parallel via a rectifier and output. In this way, by combining a plurality of types of coils having different wire diameters and different numbers of turns, desired output characteristics can be obtained, which can contribute to performance improvement and cost reduction.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes an AC generator using a permanent magnet. The AC generator 1 includes a cylindrical housing 2, a rotor shaft 4 rotatably supported by the housing 2 via a bearing 3, A rotor core 5 integrally formed with the rotor shaft 4; a permanent magnet 6 fixed to an outer peripheral portion of the rotor core 5; a stator core fixed to an inner peripheral surface of the housing 2 with an air gap from the permanent magnet 6 7, an armature winding 8 wound around the stator core 7
And the like are the same as before.

In the present embodiment, the armature winding 8 is constituted by using two kinds of coils, a first coil 9 and a second coil 10. A wire having a larger wire diameter and a smaller number of turns is employed. In the present embodiment, the first coil 9 is wound around one half of the stator core 7 and the second coil 10 is wound around the other half of the stator core 7.

Further, lead wires 9a, 9b, 1 which are respectively drawn from respective ends of the first and second coils 9, 10 are described.
The coils 0a and 10b are guided to a rectifier 11, converted into a direct current by the rectifier 11, and output to a battery 12. In this case, the first and second coils 9, 10 are connected to different rectifiers 11a and 11b, respectively. And each rectifier 11
The output current from the rectifier 11 in which a and 11b are connected in parallel is configured so as to combine the output currents of the first and second coils 9 and 10.

In the structure described above, the armature winding 8 is formed by using two types of first and second coils 9 and 10 having different wire diameters and numbers of turns. The combined output current of the two coils 9 and 10 is output from the rectifier 11. Thus, the alternator 1
As shown in FIG. 5, an output characteristic A showing the relationship between the rotation speed of the rotor shaft 4 and the output current is an output characteristic B using only the first coil 9 as the armature winding 8, and an output characteristic A
The output characteristic C is obtained by combining only the output characteristic C with the output characteristic C. In FIG. 5, D is the required output characteristic.

As a result, the required output characteristics can be obtained by combining the first and second coils 9 and 10 having different wire diameters and the number of turns, which can contribute to the improvement of the performance of the AC generator 1. . In addition, this device does not require the design change of other parts, such as the one in which the dimensions of the stator core 5 and the permanent magnet 6 are changed in order to obtain the required output characteristics. , The second coil 9, 10
Since only the wire diameter and the number of turns are changed, cost reduction can be achieved.

The present invention is, of course, not limited to the above embodiment, and the coils constituting the armature winding may be of three or more types, and each coil may be a wire. One of the diameter and the number of turns may be different. Further, in winding each coil around the stator core, in the above-described embodiment, the first coil is provided on one half of the stator core and the second coil is provided on the other half of the stator core. However, the present invention is not limited to this. FIG. 6 without
As in the second embodiment shown in FIG. 6A, they may be arranged alternately in the circumferential direction.
As in the third and fourth embodiments shown in (C), a double-layer winding may be used.

[Brief description of the drawings]

FIG. 1 is a sectional view of an AC generator.

FIG. 2 is a front view of a stator unit.

FIG. 3 is a side view of a stator unit.

FIG. 4 is a measurement circuit of an AC generator.

FIG. 5 is a diagram showing output characteristics.

FIGS. 6 (A), (B) and (C) are explanatory views showing the arrangement of the first and second coils of the second, third and fourth embodiments, respectively.

FIG. 7 is a diagram showing output characteristics in a conventional example.

[Explanation of symbols]

 Reference Signs List 1 AC generator 8 Armature winding 9 First coil 10 Second coil 11 Rectifier

Claims (1)

[Claims] 1. An alternator in which an armature winding is constituted by a plurality of types of coils having at least one of a different wire diameter and a different number of turns, and each coil is connected in parallel via a rectifier to output.