JPH065375U - Magnet generator for internal combustion engine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a small-sized magnet generator for an internal combustion engine, which increases the magnetic flux flowing in the armature core without increasing the size of the permanent magnet to generate a high output. [Structure] The first inner wall of the cup-shaped rotor yoke 3
Magnet fields 6a to 6d are provided, and second magnet fields 7a to 7d are provided on the outer periphery of the boss portion of the rotor yoke. The magnetic pole constituent blocks 8a to 8d and the iron core leg portions 9a to 9d located between the magnetic pole constituent blocks, and one and the other ends of each iron core leg portion are magnetically coupled to different magnetic pole constituent blocks on both sides of each iron core leg portion. An armature core including iron parts 10a to 10d is arranged between the first magnet field and the second magnet field. The armature coils 11a to 11d are wound around at least one of the core legs of the armature core.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnet generator mounted on an internal combustion engine.

[0002]

[Prior art]

 As a generator mounted on an internal combustion engine of a motorcycle or the like and supplying electric power for ignition of the engine and charging of a battery, a magnet rotor driven by the engine, an armature core, and the armature core are wound around the rotor. A magnet generator provided with a stator having an armature coil is used.

As a conventional magnet generator of this type, a so-called flywheel magnet generator is often used. A flywheel magnet generator has a permanent magnet attached to the inner circumference of a peripheral wall portion of a substantially cup-shaped rotor yoke having a peripheral wall portion, a bottom wall portion, and a boss portion provided at the center of the bottom wall portion. It has a magnet rotor that constitutes a magnet field in which different polarities are alternately arranged in the circumferential direction by permanent magnets, and a magnetic rotor that is arranged inside the rotor and faces each magnetic pole of the rotor. It consists of a stator in which an armature coil is wound around a pole armature core, and a voltage is induced in the armature coil by the magnetic flux change of the armature core caused by the rotation of the magnet rotor.

[0004]

[Problems to be solved by the device]

 In motorcycles, especially in vehicles such as motocross and road races, it is required that the magnet generator installed in the engine be compact, lightweight and generate high output. Moreover, recently, electric control devices have been used in the fuel system and exhaust system of engines, so the load on the generator tends to increase, and higher output of the magnet generator is required. It is supposed to be done.

In order to increase the output of the magnet generator, it is necessary to increase the volume of the permanent magnet, but in the conventional magnet generator, when the volume of the permanent magnet is increased to increase the output, the rotation of the magnet rotates. There has been a problem that the outer diameter or axial length of the child increases and the magnet generator becomes large.

An object of the present invention is to increase the magnetic flux flowing in the armature core without enlarging the permanent magnets provided on the inner circumference of the peripheral wall portion of the rotor yoke, so that a high output can be obtained in a small size. Another object of the present invention is to provide a magnet generator for an internal combustion engine.

[0007]

[Means for Solving the Problems]

 The present invention relates to a magnet generator for an internal combustion engine including a magnet rotor driven by an internal combustion engine, and a stator having an armature core and an armature coil wound around the armature core. is there.

In the present invention, the magnet rotor is a substantially cup-shaped rotating body having a peripheral wall portion and a bottom wall portion, and a boss portion provided in the center of the bottom wall portion and extending concentrically inside the peripheral wall portion. A first magnet field consisting of a child yoke, a permanent magnet attached inside the peripheral wall of the rotor yoke, and a second magnet field consisting of a permanent magnet attached to the outer periphery of the boss of the rotor yoke. The first magnet field and the second magnet field are arranged in the circumferential direction and are magnetized so as to alternately show different polarities (n is an integer of 2 or more). It has a magnetic pole portion, and magnetic pole portions having the same polarity of both magnet fields are arranged to face each other in the radial direction.

The armature core includes 2n magnetic pole building blocks respectively arranged between 2n magnetic pole portions of the first magnet field and the second magnet field facing each other, and the 2n magnetic poles. It comprises 2n iron core legs arranged between the constituent blocks and yokes for magnetically coupling one end and the other end of each core leg to different magnetic pole constituent blocks on both sides of each core leg. An armature coil is wound around at least one of the 2n core legs of the armature core.

[0010]

In the above generator, when the magnetic pole portions of the same polarity of the first magnetic field and the second magnetic field of the magnet rotor, which face each other, face the magnetic pole constituent blocks of the armature iron core, A magnetic flux generated by the first magnet field and a magnetic flux generated by the second magnet field flow in the respective iron leg portions of the iron core in the same direction. Since the magnetic flux of each iron core leg changes n cycles per revolution of the magnet rotor, n cycles of AC voltage per revolution are induced in the armature coil wound around the core leg. To do. The second magnetic field consists of a permanent magnet attached to the outer circumference of the boss of the rotor yoke, so the magnetic flux passing through the iron core leg is increased without increasing the outer diameter of the peripheral wall of the rotor yoke. It is possible to increase the number, and it is possible to obtain a compact and high-power magneto generator.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 3 show an embodiment in which the present invention is applied to a 4-pole (n = 2) magnet generator. In these figures, 1 is a magnet rotation driven by an internal combustion engine (not shown). A child 2 is a stator attached to the case of the engine, and the magnet rotor 1 and the stator 2 constitute a magnet generator for an internal combustion engine.

Reference numeral 3 denotes a flywheel having a peripheral wall portion 3a made of a magnetic material and a bottom wall portion 3b. Reference numeral 4 denotes a flange portion 4a made of a magnetic material and fixed to a central portion of the bottom wall portion 3b of the flywheel 3. The flywheel 3 is a boss portion having an inner side of a peripheral wall portion 3a and a tubular portion 4b extending concentrically with the flywheel. The flywheel 3 and the boss portion 4 form a substantially cup-shaped rotor yoke 5. ing.

Four arc-shaped permanent magnets 6a to 6d forming the first magnet field are attached to the inner circumference of the peripheral wall portion 3a of the flywheel 3 at equal angular intervals, and the rotor yoke's bobbin is Four arc-shaped permanent magnets 7a to 7d forming the second magnet field are arranged at equal angular intervals on the outer periphery of the cylindrical portion 4b of the spacer portion 4 and in the radial direction with the permanent magnets 6a to 6d. It is installed in a position facing each other.

The permanent magnets 6a to 6d that form the first magnet field and the permanent magnets 7a to 7d that form the second magnet field are magnetized in the radial direction and respectively have different polarities. (2n = 4) magnetic poles are formed, and the magnetic poles of the same polarity of both magnet fields are arranged so as to face each other in the radial direction.

A magnet rotor 1 is composed of the rotor yoke 5 and permanent magnets 6 a to 6 d and 7 a to 7 d which respectively form the first and second magnet fields, and the magnet rotor 1 has a boss portion. It is attached to the engine by fitting a tapered hole 4c formed inside the tubular portion of No. 4 on the rotating shaft of the engine.

The stator 2 is arranged inside the magnet rotor 1. The stator 2 includes four magnetic pole constituent blocks 8a to 8d, four core core legs 9a to 9d arranged between the magnetic pole constituent blocks, and each of the iron core leg portions to the magnetic pole constituent blocks. An armature core including four armature cores 10a to 10d to be coupled to each other, and armature coils 11a to 11d respectively wound around respective core leg portions of the armature core. Is attached to the stator base plate 13 (see FIG. 2).

The magnetic pole constituting blocks 8a to 8d are each formed by laminating iron plates having a predetermined shape, and the first magnetic field and the second magnetic field of the magnet rotor 1 are opposed to each other. The magnetic poles of the pair of permanent magnets 6a and 7a, 6b and 7b, 7c and 7c, 6d and 7d are arranged so as to face each other via a small gap. Each of the iron core leg portions 9a to 9d is made of a rod-shaped iron core, and each iron core leg portion is arranged between the magnetic pole constituent blocks 8a to 8d in a state where its axis line is parallel to the axis line of the magnet rotor 1.

The yoke portions 10a to 10d that magnetically couple the iron core leg portion and the magnetic pole constituent block are respectively composed of a plate-shaped magnetic pole constituent block connecting portion that abuts on the end face in the axial direction of each magnetic pole constituent block, and And an iron core leg connecting portion extending on both sides. As shown in FIGS. 1 and 3, the yoke portions 10a and 10c are arranged on the lower surfaces in the axial direction of the magnetic pole constituting blocks 8a and 8c, respectively, whose magnetic pole constituting block coupling portions are at 180-degree opposite positions, and are arranged to overlap each other. The leg coupling portions are coupled to respective one ends of different core leg portions 9a and 9b and 9c and 9d on both sides of the magnetic pole constituting blocks 8a and 8c, respectively.

Further, the yoke portions 10b and 10d are respectively arranged so as to overlap with the upper surfaces in the axial direction of the other magnetic pole constituting blocks 8b and 8c whose magnetic pole constituting block joints are at 180-degree opposite positions, and the iron core leg joints are The magnetic pole forming blocks 8b and 8c are respectively connected to the other ends of the different core leg portions 9b and 9c and 9d and 9a on both sides. Each magnetic pole constituent block and each yoke portion arranged so as to overlap the magnetic pole constituent block are fixed to the stator base plate 13 by a mounting screw 12 which is inserted into an axial through hole provided therein. (See Figure 2).

Armature coils 11a to 11d are respectively wound around the iron core legs 9a to 9d via an insulating bobbin.

In the magnet generator having the above structure, when the magnet rotor 1 is at the rotation position shown in FIG. 1, each of the permanent magnets 6a to 6d of the first magnetic field and the second magnetic fields 7a to 7d. In the state where the magnetic pole portions face the magnetic pole constituent blocks 8a to 8d respectively as shown in the figure, for example, the iron core leg portion 9a has a permanent magnet 6a → the magnetic pole constituent block 8a → the yoke portion 10a → the iron core leg portion 9a → Yoke part 10d → permanent magnet 6d → peripheral wall part 3a of rotor yoke 5 → permanent magnet 6a → permanent magnet 7a → magnetic pole constituent block 8a along with the magnetic flux generated by the first magnet field flowing in the path of permanent magnet 6a. -> Yoke part 10a-> Iron core leg part 9a-> Yoke part 10d-> Permanent magnet 7d-> Boss part 4-> Permanent magnet 7a The magnetic flux by the second magnet field also flows in the direction of the arrow in the figure. Therefore, the magnetic fluxes of the first and second magnetic field fields flow in the iron core leg 9a in the same direction. Similarly, the magnetic flux of the first magnet field and the magnetic flux of the second magnet field also flow in the iron leg portions 9b, 9c, 9d in the same direction.

At the position where the magnet rotor has rotated 90 degrees (360 degrees / 2n, n = 2), the polarities of the magnetic poles of the permanent magnets facing the magnetic pole building blocks are reversed, so that they flow through the iron core legs. It is opposite to the direction of magnetic flux. Therefore, a magnetic flux change of 2 cycles (n cycles) occurs per revolution of the magnet rotor 1 in each iron core leg. Due to this change in magnetic flux, a voltage of 2 cycles per rotation is induced in each of the armature coils 11a to 11d wound around each iron core leg, and power is supplied to the load by the output of each armature coil. .

In the above embodiment, the armature coil is wound around all of the four iron core legs. However, if necessary, the armature coil may be wound around one to three of the iron core legs. Good. In the above embodiment, the magnet generator has four poles, and each of the magnetic poles of the first and second magnet fields, the magnetic pole constituent blocks, and the four core leg portions are provided. A 2n-pole magneto-generator can be constructed by providing 2n pieces of each (n is an integer of 2 or more).

[0025]

[Effect of device]

 As described above, according to the present invention, the first magnet field composed of a permanent magnet mounted on the inner circumference of the peripheral wall portion of the rotor yoke and the permanent magnet mounted on the outer circumference of the boss portion of the rotor yoke. And a second magnet field consisting of a magnetic field generated by the first and second magnet fields in the same direction on the iron core leg around which the armature coil of the armature core is wound. Since it is made to flow, the output of the generator coil can be increased without increasing the outer diameter of the peripheral wall portion of the rotor yoke, as compared with the conventional generator having only the first magnet field. Therefore, it is possible to obtain a compact and high-power magneto generator for an internal combustion engine.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AOA of FIG.

3 is a perspective view showing an assembly structure of the stator in FIG. 1. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 magnet rotor 2 stator 3 flywheel 3a peripheral wall part 3b bottom wall part 4 boss part 5 rotor yoke 6a to 6d permanent magnet (first magnetic field) 7a to 7d permanent magnet (second magnetic field) 8a-8d Magnetic pole composition block 9a-9d Iron core leg part 10a-10d Yoke part 11a-11d Armature coil 13 Stator base plate

Claims (1)

[Scope of utility model registration request] 1. A magnet generator for an internal combustion engine, comprising: a magnet rotor driven by an internal combustion engine; and a stator having an armature core and an armature coil wound around the armature core, wherein: The magnet rotor has a substantially cup-shaped rotor yoke having a peripheral wall portion, a bottom wall portion, and a boss portion provided in the center of the bottom wall portion and concentrically extending inside the peripheral wall portion, and the rotor yoke. A first magnet field composed of a permanent magnet mounted on the inner side of the peripheral wall of the rotor yoke, and a second magnet field composed of a permanent magnet mounted on the outer periphery of the boss of the rotor yoke. The first magnetic field and the second magnetic field have 2n (n is an integer of 2 or more) magnetic pole portions arranged in the circumferential direction and magnetized so as to alternately show different polarities. The magnetic poles of the same polarity of both magnet fields are arranged to face each other in the radial direction, The core is between the 2n magnetic pole constituent blocks and the 2n magnetic pole constituent blocks respectively arranged between the 2n magnetic pole portions of the first magnetic field and the second magnetic field facing each other. The armature coil includes: 2n iron core legs arranged; and yoke portions that magnetically couple one end and the other end of each core leg to different magnetic pole constituent blocks on both sides of each core leg, respectively. A magnet generator for an internal combustion engine, wherein the armature core is wound around at least one of 2n core legs.