JPH11341767A - Flywheel type generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a structure which is capable of attaining weight and size reduction in a flywheel type generator, and provide high generating output even if its structure is compact. SOLUTION: This flywheel type generator includes a generator 15a in a recessed part 2a formed at a flywheel 2, in which a rotor magnet 7 formed out of a ferromagnetic permanent magnet is disposed on the inner-periphery surface of the recessed part 2a, a multi-pole stator coil 6 is disposed inward so as to face the rotor magnet 7, and the rotor magnet 7 is formed out of a rare earth magnet, thereby forming the flywheel-type generator into a high frequency generator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a generator driven by an engine, and more particularly to a flywheel-type generator having the generator mounted on a flywheel.

[0002]

2. Description of the Related Art Conventionally, a generator driven by an engine is known. For example, there is a generator driven separately from an engine by directly connecting the generator to a crankshaft of the engine. . Also, in order to reduce the size of the generator, a concave portion is formed in the flywheel of the engine, and a rotor magnet and a stator coil are housed in the concave portion, so that a flywheel built-in type power generator in which the generator is built in the flywheel is provided. There was a machine. For example, Japanese Utility Model Application Laid-Open No. 58-139880.

[0003]

However, as described above,
In a generator having a structure directly connected to the crankshaft of the engine, the overall shape of the generator is large and heavy. In addition, since the generator is directly connected to the crankshaft, power cannot be separately taken out, and the engine is exclusively used for driving the generator, so that other working machines cannot be driven simultaneously. . Further, when a generator is built in the flywheel, the power generation capacity is usually 1 because the storage space for the rotor magnet and the stator coil is small.
The power is as low as about 00 W, and such a generator is used for charging a battery. Therefore, when the generator is used for an application requiring a large amount of power, such as for a floodlight or a welding machine, a large generator directly connected to the engine must still be used.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, the generator driven by the engine is configured as a flywheel-type generator built in a recess formed in the flywheel of the engine, and a ferromagnetic surface is formed on the inner peripheral surface on the flywheel side in the recess of the flywheel. A rotor magnet made of a permanent magnet was arranged, and a multi-pole stator coil was arranged to face the rotor magnet.

Further, a generator driven by the engine is configured as a flywheel-type generator which is housed in a recess formed in a flywheel of the engine, and an inner peripheral surface on the flywheel side in the recess of the flywheel. , A rotor magnet made of a ferromagnetic permanent magnet was arranged, and a multi-pole stator coil was arranged opposite to the rotor magnet, and the rotor magnet was made of a rare earth magnet.

In addition, a generator driven by the engine is configured as a flywheel type generator built in a recess formed in a flywheel of the engine, and an inner peripheral surface on the flywheel side in the recess of the flywheel. A rotor magnet composed of a ferromagnetic permanent magnet is disposed on the motor, and a multi-pole stator coil is disposed opposite to the rotor magnet. When attaching / detaching the flywheel to which the rotor magnet is attached to / from the engine body, the flywheel is attached to the rotor. While being able to gradually move in the direction of the axis of the crankshaft while resisting the attraction force between the magnet and the stator coil, it has become possible to align the axis of the crankshaft with the axis of the flywheel. .

A generator driven by the engine is configured as a flywheel-type generator which is housed in a recess formed in a flywheel of the engine, and an inner peripheral surface on the flywheel side in the recess of the flywheel. , A rotor magnet made of a ferromagnetic permanent magnet was arranged, and a multi-pole stator coil was arranged opposite to the rotor magnet to constitute the flywheel generator as a high-frequency generator.

[0008]

Next, an embodiment of the present invention will be described. FIG. 1 is a side sectional view showing a flywheel type generator of the present invention, FIG. 2 is a front view showing the flywheel type generator with the fan case removed, and FIG. 3 is a second view of the flywheel type generator. FIG. 4 is a side sectional view showing a third embodiment of a flywheel type generator, FIG. 5 is a partial front view showing a stator coil configured for a floodlight, and FIG. 6 is welding. FIG. 7 is a partial front view showing a stator coil configured for a machine, FIG. 7 is a schematic diagram showing a flywheel type generator of the present invention to which a discharge lamp is connected, and FIG. 8 is a generator output characteristic of the flywheel type generator of the present invention. FIG. 9 is a schematic view showing a state where a discharge lamp is connected to a conventional flywheel type generator via a ballast, and FIG. 10 is a view showing a generator output characteristic of the conventional flywheel type generator. 11 is also a generator Fig, 12 showing the generator output characteristics in the case through the ballast between the conductive lamp is a side sectional view showing a detachment state of the crank shaft of the flywheel.

First, an example in which the flywheel generator of the present invention is configured as an air-cooled gasoline engine will be described with reference to FIGS. 1 and 2. FIG. An attachment hole 2b formed in the center of the flywheel 2 is fitted to one end of the crankshaft 3 of the engine 1 which is an air-cooled gasoline engine. , The flywheel 2 is fixed to the crankshaft 3 and is configured to be integrally rotatable. Further, on the side surface of the engine 1 on which the flywheel 2 is fixed, a cylinder body 4 of the engine 1 is provided.
Further, a multi-pole stator coil 6 is fixed via a coil plate 5.

A recess 2a is formed in, for example, the inner surface of the flywheel 2, and the flywheel 2 in the recess 2a is formed.
The rotor magnet 7 is mounted along the inner peripheral surface. A space for accommodating the stator coil 6 is formed in the central portion of the concave portion 2a, and the stator coil 6 fixed to the cylinder body 4 is accommodated in the concave portion 2a. Numeral 6 is arranged in a substantially annular shape facing the rotor magnet 7. As described above, the rotor magnet 7 and the stator coil 6 are housed in the concave portion 2a of the flywheel 2 to form the generator 15, and the power generated by the generator 15 is generated by rotating the flywheel 2. It is configured to supply to. Further, the power output to the outside can be taken out from the end of the crankshaft 3 opposite to the side where the flywheel 2 is provided, so that various working machines can be connected and driven.

An outer peripheral surface of the flywheel 2 is partially cut away, and an ignition magnet 8 is fixedly provided, and an ignition coil 10 is disposed on a head portion on the outer periphery of the flywheel 2. The coil body 10a of the ignition coil 10 is attached to the ignition coil mounting boss 2 of the cylinder body 4.
3, the ignition coil 10 and the ignition magnet 8 are arranged so as to face each other. Electrical components such as the ignition coil 10 and the flywheel 2 are covered by a fan case 11. A ring gear 21 for starting is fitted on the inner side end of the flywheel 2 so that the engine 1 is started by the starter motor.

A plurality of cooling fans 9 are provided on, for example, the outer surface of the flywheel 2,
The cooling air blown by the cooling fan 9 in accordance with the rotation of the flywheel 2 enters the fan case 11 from the ventilation port 25 formed in the fan case 11. It is configured as follows. The cooling air that has entered the fan case 11 passes through the portion where the ignition coil 10 is provided, and cools a high-temperature portion such as an intake / exhaust valve or a spark plug of the cylinder head 28. Further, a plurality of flywheel side wall holes 22 which are cooling air passage holes are formed on an outer wall of the flywheel 2, and a cooling air intake hole 27 is provided on a side wall of the cylinder body 4 so that the cooling air intake hole is formed. Cooling air enters the inside from the hole 27, and the entered cooling air passes through a space 29 on the rear side (left side in FIG. 1) of the stator coil 6, and cools the stator coil 6 from the flywheel side wall hole 22. The fan case 11 is configured to pass through.

As shown in FIG. 3, the flywheel type generator can also be configured in an engine 31 which is an air-cooled diesel engine.
A flywheel 32 is fixed to one end of the shaft 3 and is configured to be rotatable integrally with the crankshaft 33. For example, a concave portion 32a is formed on the inner surface of the flywheel 32, and the rotor magnet 37 is formed along the inner peripheral surface of the concave portion 32a.
At the same time, the stator coil 36 fixed to the cylinder body 34 is housed in the recess 32a, and is arranged to face the rotor magnet 7. As described above, the generator 30 is configured by housing the rotor magnet 37 and the stator coil 36 in the recess 32 a of the flywheel 32, and is configured to generate power by rotation of the flywheel 32. Also, in the engine 31, as in the case of the engine 1, a plurality of cooling fans 39 are provided on the outer surface of the flywheel 32, and a flywheel side wall hole 38 is formed. And the stator coil 36 and the like are cooled.

Further, a flywheel type generator is shown in FIG.
As shown in FIG. 1, the engine 41 may be a water-cooled diesel engine. In the engine 41, similarly to the engine 1, a flywheel 42 is fixedly provided at one end of a crankshaft 43, and a rotor magnet 47 and a stator are provided in a concave portion 42a formed on the inner surface of the flywheel 42, for example. With the coil 46 housed, the generator 4
0, and the power is generated by the rotation of the flywheel 42. Thus, the engine that constitutes this flywheel type generator is water-cooled or air-cooled,
Or, diesel engine or gasoline engine, etc.
The format is not particularly limited, and any format can be used. The flywheel-type generator is configured such that the generator capable of supplying electric power to the outside is housed in the flywheel 2, so that it is lightweight and
It can be made compact.

Next, the rotor magnet 7 and the stator coil 6 will be described. The rotor magnet 7 is constituted by a rare earth magnet which is a ferromagnetic permanent magnet having a very high output energy. In the rotor magnet 7, as the rare earth magnet, for example, a neodymium sintered magnet mainly containing neodymium, which is a rare earth element, and iron and boron is used. The maximum energy product of the neodymium rare earth magnet is, for example, 26 to 31 MG · Oe.
The output energy is about 6 to 7 times that of a commonly used ferrite magnet. Further, similarly to the maximum energy product, the residual magnetic flux density of the neodymium rare earth magnet is also very large.

Here, the output of the generator is generally E ₀ · I
₀ = represented by _{A · f · ρ · Φ g} · Fu. Here, E ₀ is a no-load voltage, I ₀ is a short-circuit current, A is a constant, f is a frequency, Φ _g is a gap magnetic flux amount per one pole of the stator coil 6, and Fu is a one-pole The magnetomotive force per pole is shown. The frequency is represented by f = ((the number of poles of the stator coil 6) · N) / 120. When the residual magnetic flux density is represented by Br, Φ _g ∝Br, and
The relationship of Fu∝Br holds. That is, as the residual magnetic flux density Br of the rotor magnet 7 increases, the gap magnetic flux amount Φ _g and the magnetomotive force Fu increase in proportion thereto. Therefore, the generator output can be increased by using the rotor magnet 7 having a large residual magnetic flux density Br.

Therefore, in the present flywheel type generator, the generator 15 is configured by using a rare earth magnet having a very large residual magnetic flux density for the rotor magnet 7 so as to obtain a large generator output. I have. Further, in the present flywheel type generator, a large number of stator coils 6 are arranged to increase the value of the frequency f, so that a larger generator output can be obtained.
Accordingly, when the present flywheel type generator is configured to have the same size as that of a flywheel type generator that obtains a generator output of about 100 W using a conventional ferrite magnet, a generator of at least 1 kW or more is provided. An output can be obtained, and a generator output of about 2 kW to 3 kW can be obtained. Further, when a rare earth magnet is used for the rotor magnet 7, the size of the rotor magnet 7 required to obtain a generator output equivalent to that when a conventional ferrite magnet is used can be reduced. The generator can be configured to be lightweight and compact while maintaining a large generator output.

On the other hand, a large number of the stator coils 6 are arranged in a substantially annular shape so as to face the rotor magnets 7 as described above. For example, FIG. 1 shows a configuration of a stator coil 6 when used as a power supply for illuminating a floodlight provided with a projector. The rotor magnet 7 attached to the inner periphery of the concave portion 2a of the flywheel 2 is divided into a plurality of parts and arranged over the entire periphery. A multi-pole stator coil 6 is arranged to face the rotor magnet 7. In the case of the present embodiment, for example, the stator coil 6 has 18 poles. FIG. 6 shows an example in which the present flywheel type generator is configured as a power source for a welding machine, and has a multi-pole (see FIG. 6) opposed to the rotor magnet 7 attached to the inner periphery of the recess 2a of the flywheel 2. In this embodiment, a stator coil 51 having 24 poles is arranged. In this case, the three-pole stator coil 51
Is configured as one unit to extract three-phase alternating current.

Here, the power generation frequency f of the generator 15 is f
= ((Number of poles of stator coil 6) / 2) · ((engine speed) / 60). In the case of the example shown in FIG.
Since the number of poles of the stator coil 6 is 18 and the rotational speed of the engine 1 is 3600 rpm, the power generation frequency of the flywheel type generator is 540 Hz. That is, the flywheel type generator is configured as a high frequency generator.

FIG. 7 shows a state in which a discharge lamp 52 such as a metal halide lamp is connected to the flywheel type generator, and the discharge lamp 52 is directly connected to the generator 15. FIG. 8 shows the generator output characteristics of the flywheel type generator, which has a large drooping characteristic. Since the output characteristics having such a large drooping characteristic are suitable for the discharge characteristics of the discharge lamp 52 such as a metal halide lamp, the discharge lamp 52 can be stably illuminated without using a ballast. On the other hand, in a conventional flywheel type generator having, for example, two stator coils and a power generation frequency of 50 Hz or 60 Hz similar to that of a commercial power supply, the generator 1 is driven by the engine 1 as shown in FIG. The discharge lamp 52 is connected to the generator 91 via a ballast 92. This is because the generator output characteristic of the conventional flywheel type generator has a substantially constant voltage characteristic as shown in FIG. 10, and when the discharge lamp 52 is directly connected to the generator 91, the discharge lamp 52 The generator output characteristics suitable for the discharge characteristics of the discharge lamp 52 having a large drooping characteristic as shown in FIG. It has the same output characteristics as a flywheel type generator.

As described above, since the output characteristics of the present flywheel generator have characteristics suitable for the discharge characteristics of the discharge lamp 52, the discharge lamp 52 can be directly connected to the generator 15. . As a result, between the generator 15 and the discharge lamp 52, a heavy and expensive ballast 92 is provided.
This flywheel type generator can be configured compactly and inexpensively. Further, it is suitable as a generator for a floodlight provided with a discharge lamp 52 such as a metal halide lamp.

Next, a method for attaching and detaching the flywheel 2 to and from the engine body, that is, a method for attaching and detaching the flywheel 2 to and from the crankshaft 3 that is supported by the cylinder body 4 as the engine body will be described. In a conventional flywheel type generator,
When attaching / detaching the flywheel 2 to / from the crankshaft 3, an operator directly attaches / detaches the flywheel manually. However, in the present flywheel type generator, since the rotor magnet 7 is composed of a rare earth magnet having a very large magnetic force, the attraction force acting between the rotor magnet 7 and the stator coil 6 is large. When the wheel 2 is attached to the crankshaft 3, when the flywheel 2 is moved closer to the cylinder body 4 side, the flywheel 2
And the moving direction of the flywheel 2 is deviated from the axis, so that the mounting hole 2b at the center of the flywheel 2 and the crankshaft 3 cannot be fitted, or the rotor magnet 7 and the stator coil 6 In some cases, the attachment work was not successful due to sticking. Also, when removing the flywheel 2 attached to the crankshaft 3,
The attraction force acting between the rotor magnet 7 and the stator coil 6 was large, and it was not possible to extract in the axial direction only by the force of the operator.

Therefore, in the present flywheel type generator, when the flywheel 2 is attached to and detached from the crankshaft 3, the flywheel 2 is pressed against the attraction force between the rotor magnet 7 and the stator coil 6, Flywheel 2
Of the crankshaft, and the axis of the flywheel, that is, the mounting hole 2b.
It is configured such that the attachment / detachment operation can be performed while aligning with the shaft core.

That is, as shown in FIG.
The flywheel 2 is configured to be attached to and detached from the crankshaft 3 by using. The attachment / detachment jig 61 includes a cylindrical support cylinder 64 having an internal thread formed with a female screw, a cylindrical slide cylinder 62 slidably fitted on the support cylinder 64, and a sliding cylinder 62. A screw member 63 rotatably attached to the moving cylinder 62, forming a male screw on the outer periphery, and screwing with the support cylinder 64;
When the screw member 63 is rotated with respect to the support cylinder 64, the screw member 63 and the slide cylinder 62 are integrally supported. It is configured to move in the axial direction of the cylinder 64.

Then, the flywheel 2 is connected to the crankshaft 3
First, the support shaft 64 is made to penetrate through the mounting hole 2b of the flywheel 2 in a state where the support cylinder 64 is protruded from the distal end (the left end in FIG. 12) of the slide cylinder 62. The flywheel 2 is bolted to a flywheel fixing portion 62a formed at the tip of the sliding cylinder 62.
Attach it and fix it. Thereafter, the distal end (the left end in FIG. 12) of the support cylinder 64 is screwed into the screw 3 of the crankshaft 3.
a, and the support cylinder 64 is attached and fixed to the crankshaft 3. In this state, the mounting hole 2b of the flywheel 2 is
, The axis of the crankshaft 3 and the axis of the support cylinder 64 coincide with each other.

When the operation lever 66 is rotated in the direction in which the screw member 63 moves to the crankshaft 3 side,
The flywheel 2 is provided with a mounting hole 2b of the flywheel 2.
While keeping the axis of the crankshaft 3 and the axis of the crankshaft 3 aligned, the mounting hole is gradually moved toward the crankshaft 3 while resisting the attraction force between the rotor magnet 7 and the stator coil 6. 2
b and the crankshaft 3 are fitted. After the flywheel 2 is fitted to the crankshaft 3, the jig 61 is removed from the crankshaft 3, and the end nut 12 is screwed into the screw portion 3 a of the crankshaft 3 to connect the flywheel 2 to the crankshaft. 3 may be fixed.

Conversely, when removing the flywheel 2 fixed to the crankshaft 3, the end nut 12 is removed from the screw portion 3 a of the crankshaft 3, and then the support cylinder 6 is removed.
With the projection 4 projecting from the distal end of the sliding cylinder 62, the distal end of the support shaft 64 is screwed into the screw portion 3a, and the attachment / detachment jig 61 is attached to the crankshaft 3. Then, the operation lever 66 is rotated until the flywheel 2 and the flywheel fixing portion 62a of the sliding cylinder 62 come into contact with each other, and the flywheel 2 and the flywheel fixing portion 62a are connected by the bolt 67 or the like. Thereafter, the operation lever 66 is rotated in a direction in which the screw member 63 moves to the side opposite to the crankshaft 3, and
Pull out the flywheel 2 from the crankshaft 3. Further, by rotating the operation lever 66 to separate the flywheel 2 from the stator coil 6 and moving the flywheel 2 to a position where the attraction force between the rotor magnet 7 and the stator coil 6 becomes weak, the support shaft 64 is cranked. After detaching from the shaft 3, the detachable jig 61 and the flywheel 2 are separated from the engine 1. By doing so, the flywheel 2 can be removed from the crankshaft 3 by gradually moving it in the axial direction while resisting the attraction force between the rotor magnet 7 and the stator coil 6.

As described above, by using the attachment / detachment jig 61, when attaching / detaching the flywheel 2 to / from the crankshaft 3,
The flywheel 2 is gradually moved in the direction of the axis of the crankshaft 3 while resisting the attraction force between the rotor magnet 7 and the stator coil 6, and the axis of the crankshaft and the axis of the flywheel 2 are adjusted. It is possible to align with the center. Thus, when the flywheel 2 is attached to the crankshaft 3, the rotor magnet 7 and the stator coil 6 can be attached to each other simply by performing a simple operation of rotating the operation lever 66 of the attachment / detachment jig 61. In addition, since the mounting hole 2b of the flywheel 2 and the crankshaft 3 can be securely fitted, the mounting operation can be performed quickly. Also, the flywheel 2 is connected to the crankshaft 3
When removing the flywheel 2 from the crankshaft 3, the flywheel 2 can be pulled out of the crankshaft 3 simply by rotating the operation lever 66 of the attachment / detachment jig 61 and performing a simple operation that does not require force. It is possible to do. In this manner, the work of attaching and detaching the flywheel 2 to and from the crankshaft 3 can be made a simple and reliable work, and the work can be performed quickly.

[0029]

As described above, the present invention has the following advantages. That is, the generator driven by the engine is configured as a flywheel-type generator built in a recess formed in a flywheel of the engine, and the flywheel side in the recess of the flywheel is provided. A rotor magnet made of a ferromagnetic permanent magnet is arranged on the inner peripheral surface of the flywheel, and a multi-pole stator coil is arranged opposite to the rotor magnet, and a generator is mounted on the flywheel. Can be made lightweight and compact, and high generator output can be obtained despite its compact configuration. In addition, since it is possible to take out the power from the end of the crankshaft opposite to the flywheel side, various work machines are connected separately from the work machine etc. connected to the generator built in the flywheel Can be driven.

Further, since the rotor magnet is constituted by a rare earth magnet capable of obtaining an output energy about 6 to 7 times that of a commonly used ferrite magnet, With a lightweight and compact configuration, a very large generator output can be obtained even for a flywheel type generator having a small storage space for the rotor magnets and stator coils in the flywheel. For example, using a ferrite magnet for the rotor magnet
When the flywheel-type generator is configured to have the same size as a flywheel-type generator that obtains a generator output of about 0 W, the present flywheel-type generator can obtain a generator output of at least 1 kW or more and 2 kW to 3 kW. It is also possible to obtain a generator output of a certain degree.

Further, when the flywheel is attached to or detached from the engine body, the flywheel is moved in the axial direction of the crankshaft while resisting the attraction force between the rotor magnet and the stator coil. Since it is possible to move the flywheel gradually and to align the axis of the crankshaft with the axis of the flywheel, the work of attaching and detaching the flywheel to and from the crankshaft is simple and reliable, and
Work can be done quickly.

Further, since the flywheel type generator is configured as a high frequency generator, the output characteristics of the flywheel type generator are large, suitable for the discharge characteristics of a discharge lamp such as a metal halide lamp. It has drooping characteristics. Thereby, for example, when used for a floodlight equipped with a discharge lamp such as a metal halide lamp, there is no need to interpose a heavy and expensive ballast between the generator and the discharge lamp, The flywheel type generator can be configured compactly and inexpensively. Thus, it is possible to configure a flywheel type generator suitable as a generator for a floodlight.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a flywheel type generator of the present invention.

FIG. 2 is a front view showing the flywheel type generator with the fan case removed.

FIG. 3 is a side sectional view showing a second embodiment of the flywheel type generator.

FIG. 4 is a side sectional view showing a third embodiment of a flywheel type generator.

FIG. 5 is a partial front view showing a stator coil configured for a floodlight;

FIG. 6 is a partial front view showing a stator coil configured for a welding machine.

FIG. 7 is a schematic diagram showing a flywheel type generator according to the present invention to which a discharge lamp is connected.

FIG. 8 is a view showing a generator output characteristic of the flywheel type generator of the present invention.

FIG. 9 is a schematic diagram showing a state where a discharge lamp is connected to a conventional flywheel type generator via a ballast.

FIG. 10 is a diagram showing a generator output characteristic of a conventional flywheel type generator.

FIG. 11 is a diagram showing generator output characteristics when a ballast is interposed between the generator and the discharge lamp.

FIG. 12 is a side sectional view showing a state where the flywheel is attached to and detached from the crankshaft.

[Explanation of symbols]

 Reference Signs List 1 engine 2 flywheel 2a recess 2b mounting hole 3 crankshaft 4 cylinder body 5 coil plate 6 stator coil 7 magnet for power generation

Claims (4)

[Claims] 1. A flywheel-type generator, wherein a generator driven by an engine is housed in a recess formed in a flywheel of the engine, and an inner peripheral surface on a flywheel side in the recess of the flywheel. Wherein a rotor magnet made of a ferromagnetic permanent magnet is arranged, and a multi-pole stator coil is arranged opposite to the rotor magnet. 2. A flywheel-type generator in which a generator driven by an engine is housed in a recess formed in a flywheel of the engine, and an inner peripheral surface on a flywheel side in the recess of the flywheel. Wherein a rotor magnet made of a ferromagnetic permanent magnet is arranged, a multi-pole stator coil is arranged opposite to the rotor magnet, and the rotor magnet is made of a rare earth magnet. 3. A flywheel type generator in which a generator driven by an engine is housed in a recess formed in a flywheel of the engine, and an inner peripheral surface on a flywheel side in the recess of the flywheel. A rotor magnet composed of a ferromagnetic permanent magnet is disposed on the motor, and a multi-pole stator coil is disposed opposite to the rotor magnet. When attaching / detaching the flywheel to which the rotor magnet is attached to / from the engine body, the flywheel is attached to the rotor. While being able to gradually move in the direction of the axis of the crankshaft while resisting the attraction force between the magnet and the stator coil, it has become possible to align the axis of the crankshaft with the axis of the flywheel. A flywheel type generator characterized by the above-mentioned. 4. A flywheel-type generator, wherein a generator driven by the engine is housed in a recess formed in a flywheel of the engine, and an inner peripheral surface on the flywheel side in the recess of the flywheel. A flywheel generator comprising a high frequency generator, wherein a rotor magnet composed of a ferromagnetic permanent magnet is disposed, and a multi-pole stator coil is disposed facing the rotor magnet. Type generator.