JPS60144136A - Armature of magneto generator - Google Patents

Abstract

PURPOSE:To improve the heat dissipating efficiency by dissipating heat of a coil itself generated in the coil wound on a bobbin. CONSTITUTION:When a current flows to split coils 10d, 10b, 10a, 10c, 10e, the split coils generate heats to become high temperature. At this time, since the coils 10d, 10b, 10a, 10c, 10e are split axially of a bobbin 9 and continuously wound, the heats generated in these coils are dispersed. The coil 10a of the center is wound on a narrow zone S1, and the heat of the coil 10a is suppressed. The coils 10b, 10c disposed at both sides of the zone S1 are dispersed to split flanges 9b, 9c, 9d, 9e, the coils 10d, 10e disposed at both sides are dispersed to the flange 9a of the end and the flange 9b, and to the flanges 9a, 9e of the other end.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to an armature for a magnet generator, and mainly relates to a magnet generator that can easily dissipate heat generated in a coil wound around the armature bobbin. It concerns the armature.

(Prior Art) Magnet generators have conventionally been used in capacitive discharge ignition systems for, for example, two-stroke engines. As is well known, a capacitive discharge ignition system generates power with a magnet generator, rectifies this power, charges the ignition capacitor, and then generates a signal from the pulser coil. When the charged power is discharged and current flows through the primary side of the ignition coil, a high voltage is generated on the secondary side and sparks occur.

By the way, this magnet generator has a plurality of magnets attached to the inner circumferential surface of a bottomed cylindrical rotor that rotates in synchronization with the crankshaft, and a charging armature is fixed to the stator in opposition to the magnets. The rotation of the rotor generates an electromotive force in the armature. This armature has a bobbin fitted to a stator core, and a coil wound around the bobbin.

However, in winding this coil, one coil is continuously wound in one wide section defined by flanges at both ends of the bobbin. For this reason, when an electromotive force is generated in the armature, heat is generated in the coil itself, and this heat is easily conducted to the flanges of the bobbin and radiated at both ends of the coil in the axial direction, but it is difficult to conduct heat in the center. I tend to concentrate on it. For this reason, the bobbin material, coil, and even the components of the magnet generator are required to have a high degree of heat resistance.

(Object of the Invention) This invention was made against the background of the above circumstances, and provides an armature for a magnet generator that improves heat dissipation efficiency by dispersing the heat generated by the coil itself, which is generated in a coil wound around a pobbin. The purpose is to

(Structure of the Invention) In order to achieve the above object, the present invention provides a plurality of dividing flanges on the pobbin of the armature to form a plurality of compartments,
This section is characterized by the fact that the center of the potbin is small and both ends are large.

(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

Figure 1 is a cross-sectional view of a magnet generator used in a capacitive discharge ignition system for two-cycle engines, etc. Figure 2 is a front view of the charging armature of this magnet generator, and Figure 3 is a perspective view of the armature. It is.

In FIG. 1, reference numeral 1 denotes a rotor of a magnet generator, and this rotor 1 is fixed to a crankshaft 2 of an engine and rotates in synchronization with the crankshaft 2. The rotor 1 has a cylindrical shape with a bottom, and four magnets 3 are fixed inside.

Inside the rotor 1, there is an armature 4 for a lamp, an armature 5 for charging an ignition capacitor of a capacitive discharge ignition device with electric power,
A pulser coil 6 for discharging the electric power charged in the ignition capacitor is disposed in the grooves 1, each of which is fixed to the stator 7.

As shown in FIGS. 2 and 3, the armature 5 is composed of a stator core 8, a pobbin 9, and a coil II/IO.

The stator core 8 is formed by laminating thin magnetic plates, and is fixed to the stator 7 by inserting screws 12 into screw holes 11 formed at both ends.

The pobbin 9 is molded, for example, from a heat-resistant synthetic resin, and is fitted into the stator core 8. This pobbin 9 has flanges 9a, 9a at both ends in the axial direction.
, 4 divided francs between 9a: :,;' 9 b ,
9C, 9r3, and 9e are formed. A section St defined by split flanges 9c and 9d located in the center of this pobbin 9 is narrow, and a split flange s located on both sides of this; , 9e is wider than the section S1 with the same size. Then, the flanges at the ends located on both sides -'9a and the dividing flan 1) 9
The section S5 defined by the flange 9a and the split flange 9e has the same size and is wider than the sections S2 and S3.

In this way, the section S4. S2. Sl,
S3 and S5 include divided coils 10d, 10h, 10^, lQC, l, which constitute the charging coil 10, respectively.
Qe are continuous and wound in series. Then, due to the electromotive force generated in the armature 5 due to the rotation of the rotor 1, radio waves flow to each divided coil, thereby causing each divided coil xo
d, tob, 10a, and 10c110e themselves generate heat. This heat generation is caused by Pobin 9's divided franc';'
9b.

It is arranged to be distributed in 9c, 9d, and 9e.

Since the pobbin 9 has a high heat dissipation effect on the outside in the direction of both ends of the stator core 8 attached to the stator 7 of the magnet generator, the sections of the pobbin 9 are wide at both ends, and the sections of the pobbin 9 are formed narrower toward the center. As a result, the heat generated in the split coil itself is absorbed and evened out, reducing the rise in temperature.

Next, the operation of this embodiment will be explained.

When the rotor 1 rotates, an electromotive force is generated in the armature 5, and the divided coil jl/l Od, 1. Oh, 10a
A current flows through , 10C+ J Q p, and this current!
I! Charge the ignition capacitor (not shown) by draining it.

Because of this current, each split coil lOd, Joh
.

JOa, JOc, and IOe themselves generate heat and reach high temperatures. At this time, the divided coils 10cl, 101), IQ^, IOc
, 10e are divided in the axial direction of the pobbin 9 and wound continuously, so that the heat generated in these coils is dispersed.

The heat dissipation performance is poorer toward the center, and the temperature becomes higher than that at both ends of the pobbin 9. By the way, the split coil 10 in the center
a is wound in a narrow section S1, and the divided carp II/
l Heat generation of OA itself is suppressed.

The divided coils 10b and l located on both sides of this
OC is divided flanges 9b, 9c and 9d.

9e, and the split carp J1/10 located on both sides of this
d, 10e are the end flange 9a and the split flange 9
The heat is radiated by being distributed to the flange 5; 9a at the other end and the split flange 9e. Thereby, the heat generation of the charging coil IO can be made uniform as a whole.

Note that the split flanges 9b and 9c of the above embodiment.

Although four pieces 9d and 9e were formed, the number is not limited.

Further, the intervals between the divided flanges 9b, 9c, 9d, and 9e can also be freely set depending on the magnitude of the electromotive force generated in the armature 5, etc.

In addition, the armature 5 is applicable not only to the armature of a magnet generator used in a capacitive discharge ignition device such as a two-stroke engine, but also to the armature of a wide magnet generator, and the armature is not limited to being used for charging. .

(Effects of the Invention) As described above, this invention provides a plurality of divisions in the bobbin of the armature to form a plurality of divisions and winds coils in these divisions, so that the coil I+/self generates heat. The heat is dispersed and radiated by the divided flapper 2, and the temperature can be reduced by 2A. The multiple compartments are small in the center of the bobbin and large in both ends, which reduces the concentration of heat in the center of the bobbin and averages out the temperature rise of the entire bobbin. It can be suppressed. As a result, the heat resistance of each member constituting the bobbin molding material, carp magnet generator can be lowered, and manufacturing costs can be reduced.

[Brief explanation of drawings]

Figure 1 is a sectional view of a magnet generator to which this invention is applied;
The figure is a front view of the armature, and FIG. 3 is a perspective view of the armature. 5... Armature 8... Stator core 9... Bobbin 9a, 9a... Flange 9b, 9
c, 9d, 9e...Divided flange 10...Charging coil 10a, 10h, 10c, 'IOd, 10e...-Divided coil l1z Sl', S2. S3. S4. S5...Division No. 1, Figure 1

Claims (1)

[Claims] A magnet generator in which a plurality of magnets are assembled on the inner peripheral surface of a bottomed cylindrical rotor, and an armature in which a coil is wound around a bobbin fitted to a stator core is disposed opposite to the magnets, The armature of the magnet generator, wherein a plurality of dividing flanges are provided on the bobbin of the armature to form a plurality of sections, and the sections are configured such that the center portion of the bobbin is small and both ends are large.