JPH11136916A - Flywheel magnet power generator driven by internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve output of a flywheel magnet power generator which is driven by an internal combustion engine. SOLUTION: An annular yoke 20, consisting of a magnetic material having more superior magnetic characteristic than cast iron is engaged and fixed to the internal circumference of a circumference wall portion 401 of a flywheel 4 made of cast iron. Plate type rate-earth magnets 21 numbering system in total are arranged in equal angular intervals on the interna circumference of the yoke 20, each rate-earth magnet 21 is bonded to the yoke 20, and the magnetic field M1 is formed by the yoke 20 and rare-earth magnet 21. A groove 22 is formed to a part located between the rare-earth magnets 2 at the internal circumference of the yoke 20. A stator 2 formed by winding a power penetration coil 9 to the armature iron core 8 consisting of annular star type iron core of 24 poles is arranged at the internal side of the flywheel 4, and the magnetic pole portion of the armature iron core 8 is provided opposite to a magnet filed M1 .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel magnet generator driven by an internal combustion engine.

[0002]

2. Description of the Related Art As a generator driven by an internal combustion engine, a magnet generator in which a permanent magnet forms a field of a rotor is often used. This type of generator includes a magnet rotor attached to a rotating shaft of an internal combustion engine, and a stator attached to a case or the like of the engine. The magnet rotor is often provided with a flywheel having a peripheral wall and a bottom wall having a boss coupled to the rotating shaft of the internal combustion engine, and n formed on the inner periphery of the peripheral wall of the flywheel. Pole (n is an even number of 2 or more).
The stator is composed of an armature core having m (m is an even number of 2 or more) magnetic pole portions facing the magnet field of the magnet rotor, and a power generating coil wound around the armature core. I have.

In a flywheel magnet generator driven by an internal combustion engine, an ignition magnet is often attached to the outer periphery of the peripheral wall of the flywheel in order to obtain a voltage for driving an ignition device for the internal combustion engine. Thus, an ignition magnet field is formed, and an ignition generator disposed outside the flywheel is opposed to the ignition magnet field, thereby forming a magnet generator (magneto) for driving the ignition device. .

FIGS. 4 and 5 show examples of the construction of a conventional flywheel magnet generator. In FIG. 4, reference numeral 1 denotes a magnet rotor, 2 denotes a stator, and 3 denotes an ignition generator.

The magnet rotor 1 has a peripheral wall 401 and a bottom wall 4
02, a circular arc-shaped permanent magnet 5 which is disposed at equal angular intervals on the inner periphery of the peripheral wall 401 of the flywheel 4 and is adhered to the peripheral wall 401,
It comprises an ignition permanent magnet 7 fixed together with a pole piece 6 in a magnet mounting recess 401a1 formed on the outer periphery of the peripheral wall of the flywheel. A boss 402a is formed at the center of the bottom wall 402 of the flywheel 4, and the boss 402a is coupled to a rotating shaft of the internal combustion engine. In the illustrated example, seven permanent magnets 5 are arranged in an annular shape on the inner periphery of the flywheel, and predetermined regions of these permanent magnets are magnetized in the radial direction of the flywheel to form an inner periphery of the flywheel. N poles (n is an even number of 2 or more; in the illustrated example, n =
12) The main magnet field M1 is formed. Further, the ignition permanent magnet 7 is magnetized in the radial direction of the flywheel, and the magnetic pole on the flywheel side of the permanent magnet 7 (in the illustrated example, S
Poles) are led out to the outer periphery of the flywheel on both sides of the magnet mounting recess 401a1. Magnet mounting recess 401a1
The magnetic poles (S-poles) drawn out on both sides of the flywheel and the magnetic poles (N-poles) drawn out of the pole piece 6 make the outer periphery of the flywheel 3
A pole ignition magnet field M2 is formed.

The stator 2 includes m pieces (m is an even number of 2 or more, m = 3n / 2 = 1 in the illustrated example) from the annular yoke portion 8a.
8) by projecting the salient pole portions 8b radially,
Armature core 8 made of an annular star-shaped iron core having a magnetic pole portion facing the magnet field, and salient pole portions 8b and 8b of armature iron core 8.
, 8b,... And three-phase connected power generation coils 9, 9,. The stator 2 is arranged inside the flywheel 4 while sharing a central axis with the flywheel, and is fixed to a mounting portion provided in a case or the like of the internal combustion engine, and a salient pole portion of the armature core 8. 8b, 8
The magnetic pole at the tip of b,... is the main magnet field M1 of the magnet rotor 1.
Are opposed to each other via a predetermined gap.

[0007] The ignition generator 3 has a magnetic pole 10 at both ends.
a, 10a, and a U-shaped iron core 10;
And an ignition coil 11 wound around the coil. The ignition coil 11 comprises a concentrically wound primary coil and a secondary coil, and a resin mold portion 11a is formed so as to cover the primary coil and the secondary coil.
In this example, the primary coil of the ignition coil 11 also serves as the ignition power supply coil, and the ignition magnet field M2 formed on the outer periphery of the flywheel by the ignition permanent magnet 7 is
When passing through the positions of the magnetic pole portions 10a, 10a,
The AC voltage is induced in the primary coil of the ignition coil 11 due to the change in the magnetic flux generated in the ignition coil 11. An unillustrated ignition unit is connected to the primary coil of the ignition coil 11, and the ignition unit controls the primary current of the ignition coil to induce a high voltage for ignition in the secondary coil of the ignition coil. In the illustrated example, a high-voltage cord lead-out portion 11a1 is formed at a portion near the outer periphery of a resin mold portion 11a that covers the ignition coil 11, and a high-voltage cord 12 is pulled out from the high-pressure code lead portion. High pressure cord 1
One end of the high-voltage cord 2 is connected to the non-grounded output terminal of the secondary coil of the ignition coil in the resin mold portion 11a, and the other end of the high-voltage cord is connected to a cylinder of the engine via a connector 13 (see FIG. (Not shown)).

In this example, a flywheel magnet generator is constituted by the magnet rotor 1, the stator 2, and the ignition generator 3, and generates a magnetic flux generated in the armature core 8 with the rotation of the magnet rotor 1. Due to the change, a three-phase AC voltage is induced in the power generation coil 9. The output of the power generation coil 9 is supplied to loads such as a lighting load, a battery charger, and a DC power supply circuit that supplies a DC voltage to a control unit that controls the internal combustion engine.

[0009]

In the conventional flywheel magnet generator, the permanent magnet 5 made of a ferrite magnet is adhered to the inner periphery of the peripheral wall of the flywheel to form the magnet rotor 1. Since the size of the flywheel attached to the internal combustion engine is limited and it is difficult to secure a large space inside the flywheel, the volume of the permanent magnet 5 cannot be increased unnecessarily. for that reason,
It is difficult to obtain a large output from this type of magnet generator, and there is a problem that the load that can be driven is limited to a relatively small load.

In the flywheel magnet generator shown in FIG. 4, a magnet 5 attached to the inner periphery of the flywheel is provided.
Although it is conceivable to use a rare earth magnet having a large coercive force as the cast iron, the cast iron forming the flywheel has poor magnetic properties and a low saturation magnetic flux density. A large amount of magnetic flux could not flow through the peripheral wall of the wheel, and the power generation output could not be improved as expected. Further, when the rare earth magnet is directly attached to the inner periphery of the peripheral wall of the flywheel made of cast iron, a large amount of iron loss occurs in the peripheral wall of the flywheel, so that it is inevitable that the power generation efficiency deteriorates. Further, since the rare-earth magnet is thin and the distance between the N and S poles is short, when the rare-earth magnet is directly mounted on the inner periphery of the peripheral wall of the flywheel, a large amount of leakage magnetic flux is generated on the end side of the magnet. This causes a problem that the amount of magnetic flux interlinking with the power generation coil is reduced by that amount and the power generation output is limited. Therefore, in the magnet generator shown in FIG. 4, simply using a rare-earth magnet as the permanent magnet 5 could not achieve the expected power generation performance.

An object of the present invention is to use a rare-earth magnet as a magnet attached to the inner periphery of a flywheel and sufficiently exhibit its performance, thereby greatly improving the output as compared with the case of using a ferrite magnet. SUMMARY OF THE INVENTION An object of the present invention is to provide a flywheel magnet generator driven by an internal combustion engine which can be achieved.

[0012]

SUMMARY OF THE INVENTION The present invention relates to a cast iron flywheel having a peripheral wall and a bottom wall having a boss coupled to a rotating shaft of an internal combustion engine. n is an even number of 2 or more) magnetic field rotor, and a generator coil is attached to an armature core having m (m is an even number of 2 or more) magnetic pole portions facing the magnet field. The present invention relates to an internal combustion engine driven flywheel magnet generator including a wound stator.

In the present invention, an annular yoke made of a magnetic material having a higher saturation magnetic flux density and a higher magnetic permeability than the cast iron constituting the flywheel and having a small coercive force is provided, and the yoke is formed inside the peripheral wall of the flywheel. Fit and fix around.
Then, n plate-shaped rare earth magnets are arranged at a predetermined angular interval on the inner periphery of the annular yoke, and each rare earth magnet is fixed to the yoke. The magnet field is constituted by the fixed n plate-shaped rare earth magnets. The rare earth magnet may be fixed to the yoke by bonding.

As described above, an annular yoke made of a magnetic material having a higher saturation magnetic flux density and a higher magnetic permeability and a smaller coercive force than the cast iron constituting the flywheel is provided, and a plate-shaped rare earth element is provided on the inner periphery of the yoke. If you try to attach a magnet,
Since a large amount of magnetic flux can flow through the magnetic path (yoke) of the magnet field and the iron loss generated in the magnetic path of the magnet field can be reduced, the power generation efficiency is increased and the power generation output is improved. be able to.

The yoke is formed of a laminate of a predetermined number of magnetic material plates (for example, carbon steel plates and silicon steel plates) having a higher saturation magnetic flux density and a higher magnetic permeability than the cast iron constituting the flywheel and having a low coercive force. Is preferred. When the yoke is formed of a laminate in this manner, iron loss can be further reduced.

In order to reduce the amount of leakage magnetic flux generated at the end portion of the rare earth magnet, the yoke has a width dimension substantially equal to the interval between the rare earth magnets at an inner periphery located between the n rare earth magnets. It is preferable to have a groove. This groove may be provided so as to extend in the axial direction of the yoke,
The yoke (flywheel) may be provided in an inclined state (skewed state) with respect to the axial direction.

As described above, if a groove having a width substantially equal to the interval between the rare earth magnets is formed in the inner peripheral portion of the yoke located between the n rare earth magnets, the plate of each rare earth magnet is formed. The magnetic resistance of the leakage magnetic path formed at the end of the yoke can be increased, so that the amount of leakage magnetic flux can be reduced and the amount of magnetic flux interlinked with the power generation coil can be increased. And the power generation output can be improved.

In this specification, the term "interval between rare-earth magnets" means not the distance between centers of adjacent rare-earth magnets but the shortest distance between adjacent ends of adjacent magnets. .

The "angular spacing between the rare earth magnets"
It means the arc angle of the arc connecting the center positions of the adjacent rare earth magnets in the circumferential direction.

In order to obtain a high power generation output, it is preferable to use a multi-pole stator. For this purpose, an annular star in which m salient poles are radially protruded from the outer periphery of an annular yoke as an armature core to form a magnetic pole facing the magnet field at the tip of each salient pole. It is preferable that a power generating coil is wound around a salient pole portion of the annular star core using a shaped iron core.

[0021]

1 to 3 show an example of the construction of a flywheel magnet generator according to the present invention. In these figures, parts that are the same as the parts of the generator shown in FIGS. 4 and 5 are given the same reference numerals. FIG.
3, 1 is a magnet rotor, 2 is a stator, 3
Are ignition generators, which constitute a flywheel magnet generator driven by an internal combustion engine.

The magnet rotor 1 includes a flywheel 4 made of cast iron attached to a rotating shaft of an internal combustion engine, and n poles (n) formed on the inner and outer peripheral sides of the flywheel 4, respectively.
Is an even number of two or more) and a three-pole ignition magnet field M2.

The flywheel 4 shown in the drawing has a main portion formed to have a substantially cup-like shape having a peripheral wall portion 401 and a bottom wall portion 402, and a boss portion 402 a is provided at the center of the bottom wall portion 402. Are formed, and a ventilation window 402b is formed around the boss 402a. A large number of blow blades 402c are formed in a portion of the bottom wall 402 of the flywheel 4 near the outer periphery.

The main magnet field M 1 formed on the inner peripheral side of the flywheel 4 is formed in an annular shape from a magnetic material having better magnetic properties than the cast iron constituting the flywheel 4, and the peripheral wall 401 of the flywheel 4 is formed. Are fixedly attached to the inner periphery of the yoke 20 at an angular interval of an equal angle α (see FIG. 1) and fixed to the yoke 20 by bonding (where n is (Even number of 2 or more) and a plate-shaped rare earth magnet 21 having the same size and shape. The illustrated rare earth magnet 21 is formed in a shape in which a plate having a rectangular outline is curved so as to form a part of a cylinder along the inner periphery of the yoke 20. The portion of the inner periphery of the yoke 20 located between the rare-earth magnets 21, 21,... Extends in the axial direction of the yoke 20, and the width dimension W (see FIG. 1) of the opening is the distance between the rare-earth magnets. Are formed, each having a size substantially equal to.
Rare earth magnets include rare earth cobalt magnets and rare earth magnets.
Iron magnets can be used. A magnetic material having magnetic properties superior to cast iron is a material having a higher saturation magnetic flux density and lower iron loss than cast iron, that is, a material having a higher saturation magnetic flux density and magnetic permeability than cast iron, and a higher coercive force. It means that it is a small magnetic material.

As a magnetic material having better magnetic properties than cast iron, carbon steel sheet, silicon steel sheet, permalloy and the like can be used.

FIG. 6 shows a carbon steel plate as an example of a magnetic material suitable for use in forming the yoke 20.
The magnetization curve (BH curve) is shown in comparison with the magnetization curve of cast iron. In FIG. 6, a curve a shows a magnetization curve of cast iron constituting a flywheel, and a curve b shows a magnetization curve of carbon steel having a carbon content of 0.45%. Curve c shows the magnetization curve of carbon steel having a carbon content of 0.16%. From this, it can be seen that when the yoke is made of carbon steel, the amount of magnetic flux flowing through the yoke can be greatly increased as compared with the case where the yoke is made of cast iron.

The illustrated yoke 20 is formed by laminating a predetermined number of carbon steel sheets punched into an annular shape which fits into the inner periphery of the peripheral wall of the flywheel 4 with almost no gap. The inner wall of the peripheral wall 401 is press-fitted and fixed to the flywheel.

On the inner periphery of the yoke 20, n (n = 16 in the example shown) grooves 22, 2 arranged at equal angular intervals in the circumferential direction.
2,... Are formed. Each groove 22 is formed so as to extend in the axial direction of the yoke 20, and the width W of the opening is equal to the inner circumference of the yoke at an equal angle α (α = 2 in the illustrated example).
Rare earth magnets 21 and 2 arranged at an angular interval of 2.5 degrees)
1,... Are set substantially equal to the interval between them. N magnets of the same shape arranged at equal angular intervals (22.5 degrees in the illustrated example) along the circumferential direction of the yoke by the portions located between the grooves 22, 22, ... in the inner peripheral portion of the yoke. Mounting stand 2
Are formed. That is, on the inner peripheral portion of the yoke 20, n magnet mounting bases 23, 23, ... separated from each other by n grooves 22, 22, ... are formed at equal angular intervals.

Each rare earth magnet 21 has the same thickness,
Further, each of the magnet mounts 23 is formed in a plate shape having substantially the same outline shape (rectangular shape in the illustrated example) as the inner surface, and one rare earth magnet 21 is bonded to the inner surface of each magnet mount 23. It is fixed by.

The yoke 20 and the rare earth magnets 21 and
The main magnet field M1 is constituted by 1,.

A thick portion 401a is formed at a portion of the peripheral wall portion 401 of the flywheel 4 near the bottom wall portion 402, and a magnet mounting recess 401a1 is formed at a part of the thick portion 401a. One magnetic pole surface of the permanent magnet for ignition (ferrite magnet) 7 is abutted on the bottom of the magnet mounting recess 401a1 via an adhesive, and the magnetic pole piece is mounted on the other magnetic pole surface of the permanent magnet 7 via an adhesive. 6 is in contact. Pole piece 6 and permanent magnet 7
Are screwed into the peripheral wall portion 401, and tightening of the bolt 25 is performed between the permanent magnet 7 and the bottom surface of the magnet mounting concave portion 401a1 and between the permanent magnet 7 and the magnetic pole piece 6, respectively. The permanent magnet 7 and the pole piece 6 are fixed to the flywheel 4 by the adhesive. The ignition permanent magnet 7 is magnetized in the radial direction of the flywheel, and the magnetic pole (S pole in the illustrated example) of the permanent magnet 7 on the flywheel side is led out to the outer periphery of the flywheel on both sides of the magnet mounting recess 401a1. ing. The permanent magnet 7, the pole piece 6, and the outer periphery of the flywheel on both sides of the concave portion 201d constitute a three-pole ignition magnet field M2.

The above-described magnet rotor 1 includes a flywheel 4
The boss portion 402a provided on the bottom wall portion 402 is connected to a crankshaft of an internal combustion engine to be mounted on the engine.

The stator 2 includes m pieces (m is an even number equal to or more than 2; m = 3n / 2 = 2 in the illustrated example) from the annular yoke portion 8a.
The salient pole portions 8b of 4) are projected radially, and each salient pole portion 8b
Are wound around an armature core 8 composed of an annular star-shaped core having a magnetic pole portion facing the magnet field M1 of the magnet rotor, and salient pole portions 8b, 8b,. The power generation coils 9 are connected in phase. The stator 2 is disposed inside the flywheel 4 while sharing a center axis with the flywheel 4 and is fixed to a mounting portion provided in a case or the like of the internal combustion engine.
The magnetic poles at the tips of the salient poles 8b, 8b,.
Of the main magnetic field M1 of FIG.

The ignition generator 3 is constituted by an iron core 10 and an ignition coil 11 wound around the iron core in the same manner as the conventional one shown in FIG. The magnetic pole portions 10a, 10a at both ends of the iron core 10 are opposed to the thick portion 401a of the hula wheel with a gap therebetween by screws inserted into the mounting holes 10b, 10b. Let me do. The primary coil of the ignition coil 11 is connected to an ignition unit (not shown), and the secondary coil is connected through a high-voltage cord 12 and a connector 13 to an ignition plug attached to a cylinder of the engine.

In the above magnet generator, the magnet rotor 1
Is driven by the internal combustion engine and rotates, the ignition magnet field formed on the outer periphery of the thick portion 401a of the flywheel passes through the position of the magnetic pole portions 10a, 10a of the iron core 10 of the ignition generator. Since a change in the magnetic flux occurs in 10, an AC voltage is induced in the primary coil of the ignition coil 11. An ignition unit (not shown) connected to the primary coil of the ignition coil 11 controls a current flowing through the primary coil of the ignition coil to induce a high voltage for ignition in the secondary coil of the ignition coil.

When the magnet rotor 1 rotates, the magnetic flux flowing through the salient pole portions 8b of the armature core 8 alternates, so that an AC voltage is generated in the power generation coil 9. In the illustrated example, since the power generation coil 9 is connected in three phases, a three-phase AC voltage is obtained from the power generation coil 9.

In the present invention, a rare earth magnet is used as a permanent magnet constituting the main magnet field M1, and the rare earth magnet is mounted on the inner periphery of a yoke 20 made of a magnetic material having better magnetic properties than cast iron. Therefore, the amount of magnetic flux linked to the power generation coil can be increased, and the iron loss generated in the magnetic path of the magnet rotor can be reduced, so that the power generation output can be increased.

Since the rare earth magnet 21 has a small thickness, a leakage magnetic flux easily flows from the N pole to the S pole at both ends in the width direction. When the leakage magnetic flux increases, the amount of magnetic flux linked to the power generation coil decreases, and the power generation performance decreases. In the above example, a groove 22 having a width substantially equal to the width W of the gap formed between the rare-earth magnets is formed in a portion of the inner periphery of the yoke 20 located between the rare-earth magnets. By increasing the magnetic resistance of the leakage magnetic path formed at both ends in the width direction, the amount of leakage magnetic flux is reduced and the power generation performance is improved.

The flywheel magnet generator according to the present invention generates a much larger output than the conventional flywheel magnet generator in which the main magnet field is constituted by ferrite magnets. For example, in the case where the magnet rotor has 16 poles and the stator has 24 poles, the conventional flywheel magnet generator can only obtain an output of about 2 [KW]. In the generator,
5 [KW] using a flywheel of the same size as before
Could easily be obtained.

In the above example, the ignition coil 11 composed of a primary coil and a secondary coil is wound around the ignition core 10 so that the primary coil of the ignition coil also functions as the ignition power supply coil. In some cases, only the ignition power supply coil is wound around the ignition generator core 10, and the ignition coil is provided outside.

In the above example, the ignition magnet field M2 is formed on the outer periphery of the flywheel, and the ignition is generated by opposing the ignition magnet field to the magnet field. Of course, the present invention can also be applied to the case where the magnet field M2 for ignition is not provided on the outer periphery of the device and the electron emission 3 for ignition is not provided.

In the above example, the groove 22 provided in the inner peripheral portion of the yoke between the rare earth magnets is formed so as to extend in the axial direction of the yoke. Can be provided in a state of being inclined with respect to (in a state of being skewed). When the groove 22 is skewed, a rare-earth magnet 21 having a shape in which a plate having a parallelogram contour is curved so as to form a part of a cylinder along the circumferential direction of the yoke is attached to the inner periphery of the yoke 20. Thus, a main magnet field M1 is formed. When the groove 22 is skewed, it is possible to expect a reduction in noise caused by the rotation of the flywheel.

As in the above example, it is desirable to provide the groove 22 at the portion of the inner periphery of the yoke located between the rare earth magnets. However, in the case where the output of the generator can be sacrificed somewhat, The groove 22 in the inner peripheral portion of the yoke can be omitted.

In the above-described example, the yoke 20 is press-fitted and fixed to the inner periphery of the peripheral wall of the flywheel. However, the yoke 20 is fitted to the inner periphery of the peripheral wall of the flywheel and And the method of fixing the yoke does not necessarily have to be by press fitting. For example, the yoke 20 may be fitted to the inner periphery of the peripheral wall of the flywheel and fixed to the peripheral wall by bonding.

In the above example, the blower blade 402c is formed integrally with the bottom wall of the flywheel. However, the blower blade is formed separately from the flywheel, and the flywheel is formed by an appropriate means such as screwing. You may make it fix to a wheel.

[0046]

As described above, according to the present invention, an annular yoke made of a magnetic material having a higher saturation magnetic flux density and a higher magnetic permeability and a smaller holding force than the cast iron constituting the flywheel is provided. A plate-shaped rare earth magnet is attached to the inner periphery of the magnet, so that a large amount of magnetic flux can flow through the magnetic path (yoke) of the magnet rotor, and iron loss generated in the magnetic path of the magnet field is reduced. be able to. Therefore, utilizing the high performance of rare earth magnets to increase power generation efficiency,
The power generation output can be improved.

In the present invention, when the yoke is constituted by a laminate of a predetermined number of plates of a magnetic material having a higher saturation magnetic flux density and a higher magnetic permeability than the cast iron constituting the flywheel and a small coercive force, iron loss is reduced. Since the number can be further reduced, the efficiency of the generator can be further increased.

In the present invention, when a groove having a width substantially equal to the interval between the rare-earth magnets is formed in a portion of the inner periphery of the yoke located between the rare-earth magnets,
Since the amount of leakage magnetic flux generated at the end of the rare earth magnet can be reduced, the amount of magnetic flux linked to the power generation coil can be increased, and the power generation performance can be further improved.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration example of an internal combustion engine driven flywheel magnet generator according to the present invention.

FIG. 2 is a sectional view of the flywheel magnet generator of FIG. 1;

FIG. 3 is a rear view of the flywheel magnet generator of FIG. 1;

FIG. 4 is a front view showing a configuration of a conventional flywheel magnet generator.

FIG. 5 is a sectional view of the flywheel magnet generator of FIG. 4;

FIG. 6 is a diagram showing a comparison between BH curves of cast iron and a carbon steel sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flywheel magnet rotor 2 Stator 3 Ignition generation 4 Flywheel 401 Peripheral wall part 402 Bottom wall part 8 Armature core 8a Yoke part 8b Salient pole part 9 Power generation coil 20 Yoke 21 Rare earth magnet 22 Groove

Claims (4)

[Claims] 1. A cast iron flywheel having a peripheral wall and a bottom wall having a boss coupled to a rotating shaft of an internal combustion engine has n poles (n is an even number of 2 or more) on the inner periphery of the peripheral wall. And a stator formed by winding a power generating coil around an armature core having m (m is an even number equal to or greater than 2) magnetic pole portions facing the magnet field. In the internal combustion engine drive flywheel magnet generator provided with, the magnet field is made of a magnetic material having a higher saturation magnetic flux density and a lower magnetic permeability than the cast iron constituting the flywheel, An annular yoke fitted and fixed to the inner periphery of the peripheral wall, and n plate-shaped rare-earth magnets arranged at predetermined angular intervals on the inner periphery of the yoke and fixed to the yoke; Internal combustion engine characterized by comprising: Dynamic flywheel magnet generator. 2. A cast iron flywheel having a peripheral wall and a bottom wall having a boss coupled to a rotating shaft of an internal combustion engine has n poles (n is an even number of 2 or more) on the inner periphery of the peripheral wall. And a stator formed by winding a power generating coil around an armature core having m (m is an even number equal to or greater than 2) magnetic pole portions facing the magnet field. In the internal combustion engine drive flywheel magnet generator provided with the above, the magnet field is formed of a laminate of plates of a magnetic material having a higher saturation magnetic flux density and a higher magnetic permeability than the cast iron constituting the flywheel and having a small coercive force. An annular yoke fitted and fixed to the inner circumference of the peripheral wall of the flywheel, and n pieces of yoke arranged at predetermined angular intervals on the inner circumference of the yoke and fixed to the yoke. And a plate-shaped rare earth magnet. Internal combustion engine driven flywheel magneto generator that. 3. The internal combustion engine according to claim 1, wherein the yoke has a groove having a width dimension substantially equal to a distance between the rare-earth magnets at a portion located between the n rare-earth magnets. Engine driven flywheel magnet generator. 4. The armature core has a plurality of m salient pole portions radially protruding from an outer peripheral portion of an annular yoke portion to form a magnetic pole portion facing the magnet field at a tip of each salient pole portion. The internal combustion engine driven flywheel magnet generator according to any one of claims 1 to 3, wherein the power generating coil is wound around a salient pole portion of the annular star core. .