JPS63157648A - Magnetic generator - Google Patents

Abstract

PURPOSE:To obtain a magnetic generator, in which eddy current is hardly conducted through a cylindrical core, by dividing the cylindrical core into three divisions. CONSTITUTION:A Landel (phonetic) core type stator 4 is constituted of a connecting member 40, through which a crankshaft 11 is inserted rotatably, a first core 5, fitted to one end 42 of the connecting member 40, a second core 6, fitted to the other end of the connecting member 40, and a cylindrical core 7, fitted to the cylindrical section 41 of the connecting member 40. One end 42 of the cylindrical section 41 is bent to the outer peripheral side 44 upon incorporating it whereby the first core 5, the second core 6 and the cylindrical core 7 are fixed with each other. Slits 47 are formed on the connecting member 40 in the direction of the flow of flux (the axial direction of the connecting member 40) whereby eddy current is hardly generated into circumferential direction. Further, wider slits 75 are formed on the central part 74 of the cylin drical part 73 of the cylindrical core 7 in the direction of the flow of the flux to make it hard to conduct the eddy current, generated in the circumferential direction of the cylindrical core 7, therefore, the increase of an output voltage due to the increase of the rotating speed of the title generator may be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a magnet generator, and more particularly to improving the output of a generator coil of a magnet generator for an internal combustion engine incorporating a Ranzor core stator.

[Prior Art] A star-shaped salient pole core type stator conventionally used in a magnet generator for an internal combustion engine is formed by winding a power generation coil around the outer periphery of a star-shaped salient pole core having a plurality of ultimate parts.

In this type of magnet generator, as the number of poles of the permanent magnet increases, the number of star-shaped ultimate parts also increases, and the winding space of the generator coil decreases. Furthermore, since the power generation coil must be wound a predetermined number of times, the diameter of the power generation coil inevitably becomes small, and there are problems such as a reduction in reliability such as breakage of crossover wires due to vibration.

This problem can be solved by using an iron-arm-shaped rotor in which multiple permanent magnets with alternating polarity are embedded in the circumferential direction, and a stator in which a power generation coil is directly wound around a cylindrical core placed inside the rotor. This can be solved.

In the stator of this magnet generator, compared to the conventional star-shaped salient pole stator, even if the number of poles of the permanent magnet increases, only one winding of the generating coil is required, resulting in a reduction in the winding space of the generating coil. there is no problem.

[Problems to be Solved by the Invention] However, when alternating magnetic flux is passed through the stator of this magnet generator, magnetic flux is generated in the axial direction of the cylindrical core (the core that constitutes the magnetic core of the same part of the power generation coil). Since the current flows in an alternating manner, eddy currents flow in the circumferential direction of the cylindrical core, resulting in a problem that the output voltage of the generator coil decreases.

An object of the present invention is to provide a magnet generator in which an eddy current flows through a cylindrical core.

[Means for Solving the Problems] In order to achieve the above object, the magnet generator of the present invention has a plurality of poles whose polarities are alternately changed in the circumferential direction on the side wall of the iron arm fixed to the rotating shaft of the internal combustion engine. In a magnet generator ffi machine provided with a magnet, a first core having a plurality of claws facing the inner circumferential surface of the magnet;
a second core having a plurality of claws disposed between adjacent claws of the core; a slit having a wide center width along the magnetic flux direction; A cylindrical core that communicates with the core, a power generation coil wound around the outer periphery of the cylindrical core, and the first core externally fitted on one end side,
The second core is externally fitted on the other end side, a cylindrical core is arranged between the first core and the second core, and the first core, the second core, and the cylindrical core are connected to each other. The structure includes a connecting member that connects the

[Actions and Effects of the Invention] With the above configuration, the magnet generator of the present invention has the following actions and effects.

In the magnet generator of the present invention, a cylindrical core fitted onto the central core connects the first core and the second core. The magnetic flux in the cylindrical core is large at the center, and the eddy current is also large at the center, so a slit is formed in the cylindrical core with a wide central peak along the magnetic flux direction, increasing the electrical resistance at the center. Eddy currents in the cylindrical core can be reduced.

Furthermore, in the magnet generator of the present invention, even if the number of poles of the magnet increases, only one turn of the generating coil is required, which prevents a reduction in the winding space of the generating coil, and increases reliability because no crossover wire is used for the generating coil. It has the advantage that the power generation coil is easy to manufacture and low cost, the number of poles can be increased structurally easily, and the output of the power generation coil can be increased by increasing the number of poles.

[Example] The magnet generator of the present invention will be explained based on the example shown in the drawings.

Fig. 1 shows a magnet generator equipped with a first embodiment of the magnet generator of the present invention.
FIG. 2 shows a main part of an engine for a 2WD vehicle, and FIG. 2 shows a first embodiment of a magnet generator of the present invention.

1 shows a two-wheel vehicle engine (hereinafter abbreviated as engine) equipped with the magnet power generator @2 of the present invention.

The magnet generator 2 includes an iron-arm-shaped rotor 3 fixed to a crankshaft 11 that is a rotating shaft of the engine 1, and a Ransol core stator 4 disposed within a side wall 31 of the rotor 3.

The rotor 3 is fixed to the crankshaft 11, and has permanent magnets 32 whose polarities (N pole, S pole) are alternately changed in the circumferential direction on the inner peripheral surface thereof.

The Ransol core stator 4 of this embodiment has eight poles,
Connection member 4 through which the crankshaft 11 is rotatably inserted
0, a first core 5 that is externally fitted on one end 42 side of the connecting member 40, a second core 6 that is externally fitted on the other end 43 side of the connecting member 40, and a second core 6 that is externally fitted on the other end 43 side of the connecting member 40; It consists of a cylindrical core 7 that is fitted.

3 and 4 show the connecting member 40. FIG.

The connecting member 40 is provided with a cylindrical portion 41 in which the crankshaft 11 is rotatably inserted. The first core 5, the second core 6, and the cylindrical core 7 are fixed by bending one end 42 of the cylindrical portion 41 toward the outer peripheral side 44 during assembly. Further, the other end 43 of the cylindrical portion 41 is provided with an annular plate-like portion 45 that extends to the outer circumferential side 44 and is engaged with the inner circumferential portion 13 of the stator base 12 . The connecting member 40 has a slit 47 formed in the direction in which magnetic flux flows (the axial direction of the connecting member 40) to prevent eddy current from flowing in the circumferential direction.

5 and 6 show the first core 5. FIG.

The first core 5 is made of ferromagnetic material and has a ring-shaped portion 51 that is fitted onto the connecting member 40 . This ring-shaped part 51
Four claw portions 53 protrude from the outer peripheral portion 52 in four directions. The claw portions 53 each have an outer peripheral portion 5 of the ring-shaped portion 51.
A radial portion 54 extends from the radial portion 2, and an axial portion 55 extends from the end portion 56 of the radial portion 54 and faces the inner circumferential surface of the permanent magnet 32.

7 and 8 show the second core 6. FIG.

The second core 6 is the same as the first core 5, and the axial portion 65 of the claw portion 63 is similar to the adjacent claw portion 5 of the first core 5.
It will be placed in 3 questions.

9 and 10 show the cylindrical core 7. FIG.

The cylindrical core 7 is made of ferromagnetic material and connects the inner peripheral side of the first core 5 and the inner peripheral side of the second core 6. The cylindrical core 7 has a slit 75 formed along the direction in which magnetic flux flows (the axial direction of the cylindrical core 7). The slit 75 has a wider width at the center 74 of the cylindrical portion 73.

The power generating coil 8 is wound around a resin cylindrical bobbin 81 arranged around the outer periphery of the cylindrical core 1 .

The operation of the magnet generator of this embodiment will be explained based on the drawings.

In the magnet generator 2 of this embodiment, the rotation of the crankshaft 11 is transmitted to the rotor 3, and due to the rotation of the rotor 3, the permanent magnet 32 → the first core 5 → the cylindrical core 7 (flow also flows to the connecting member 40) → Second core 6 → Permanent magnet 32 → 〇-ta 3 →
The magnetic flux flowing in the path of the permanent magnet 32 changes periodically, and an electromotive force is generated in the generating coil 8 due to the periodic change in the magnetic flux.

At both ends 71 , 72 of the cylindrical core 7 which are generally fitted onto the connecting member 40 , the radial part 54 and the axial part 55 of the first core 5 and the radial part 64 and the axial part of the second core 60 The portions 65 are provided substantially perpendicularly to each other, and a portion of the magnetic flux flow curves to both ends 82 and 83 of the bobbin 81.

Therefore, at both ends 71 and 72 of the cylindrical core 7, leakage of magnetic flux occurs, resulting in a decrease in magnetic flux density, while at the hanging center portion 74, magnetic flux concentrates, resulting in an increase in magnetic flux density.

Therefore, the eddy current generated in the circumferential direction of the cylindrical core 7 tends to be larger at the center 74 than at both ends 71 and 72 of the cylindrical core 7. The armature reaction caused by this eddy current greatly restricts the effect of increasing the output voltage of the generator coil 8 due to the rotational speed. Furthermore, since eddy currents also flow through the connecting member 40, the eddy currents cannot be completely blocked unless the slits 75 of the cylindrical core 7 and the slits 47 of the connecting member 40 are aligned. However, since it is not easy to match the two, the manufacturing cost becomes high.

Therefore, the cylindrical core 7 of this embodiment has a central part 74 of the cylindrical part 73.
A wide slit 75 is formed in the direction in which the magnetic flux flows to direct the eddy current generated in the circumferential direction of the cylindrical core. In particular, since eddy currents are prevented from flowing in the circumferential direction of the central portion 74 of the cylindrical portion 73, the cylindrical core 7
Even if the positions of the slits 75 of the connecting member 40 and the slits 47 of the connecting member 40 do not match, the power generating unit 8 is generated due to the increase in rotational speed.
It is possible to increase the output voltage of

Therefore, in this embodiment, the winding space of the power generating coil 8 is prevented from being reduced, and since a crossover wire with a small wire diameter is not used in the power generating coil 8, there is no disconnection due to vibration, and reliability is improved. In addition, the production of the generating coil 8 is easy and low cost, and the magnet power generation system takes full advantage of the effect of increasing the output voltage of the generating coil 8 despite the increase in the number of poles due to its structure.
It becomes 2.

FIG. 11 shows a cylindrical core according to a second embodiment of the magnet generator of the present invention.

(The same functional objects as in the second embodiment are given the same numbers.) The slit 75 of the cylindrical core 7 of this embodiment forms a circular hole 79 in the central portion 74. The slit of this thin cylindrical core may be a small circular hole or a polygonal hole formed in the center part 74 of the cylindrical core 7, or a small circular hole or a polygonal hole formed in both ends 71 and 72 of the cylindrical core 7. A large circular or polygonal hole may be formed in the center, or any shape may be used as long as the width of the center is wide and a slit is formed along the direction of magnetic flux flow.

In this example, the crankshaft of a two-wheeled automobile engine was used as the rotating shaft of the internal combustion engine to which the arm-shaped rotor is fixed, but the rotating shaft of another gasoline engine or four-wheeled automobile engine such as a camshaft may also be used. May be used.

In this embodiment, the power generation coil is wound around a cylindrical bobbin, but it may also be wound directly around a cylindrical core.

[Brief explanation of the drawing]

Fig. 1 shows a magnet generator equipped with a first embodiment of the magnet generator of the present invention.
FIG. 2 is a perspective view showing the first embodiment of the magnet generator of the present invention, and FIGS. 3 and 4 are the first embodiment of the magnet generator of the present invention. 5 and 6 are a side view and a front view showing the connecting member according to the embodiment, FIGS. 5 and 6 are a side view and a front view showing the first core according to the first embodiment of the magnet generator of the present invention, and FIG. 8 is a side view and a front view showing the second core according to the first embodiment of the magnet generator of the present invention, and FIGS. 9 and 10 are the first embodiment of the magnet generator of the present invention. A side view and a front view showing such a cylindrical core, and FIG. 11 is a side view showing a cylindrical core according to a second embodiment of the magnet generator of the present invention. In the figure 1...Engine 2...Magnet power generation +113...Rotor 4...Ransol core stator 5...First core 6...Second core 7...Cylindrical core 8...・
Generating coil 11...Crankshaft 32...Permanent magnet 40...Connection part 053, θ3...Claw part 7
4...Central part 75...Slit 79...Circular hole

Claims (1)

[Scope of Claims] 1) A magnet generator in which a multi-pole magnet with alternating polarity in the circumferential direction is provided on the side wall of an iron arm fixed to a rotating shaft of an internal combustion engine, comprising: an inner circumferential surface of the magnet; a first core having a plurality of claws facing the magnet; and a second core having a plurality of claws facing the inner peripheral surface of the magnet and disposed between adjacent claws of the first core. a cylindrical core in which a slit with a wide center width is formed along the magnetic flux direction and connects the first core and the second core; and a power generating coil wound around the outer periphery of the cylindrical core. , said first
a core is fitted onto one end, a second core is fitted onto the other end, a cylindrical core is disposed between the first core and the second core, and the first A magnet generator comprising a core, a connecting member that connects a second core, and a cylindrical core.