JP2009177893A - Magnet-type generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnet-type motor which is excellent in weight balance while meeting the requirement of moment of inertia of a flywheel and the requirement of electric power generation. <P>SOLUTION: Magnets 4a and 4b are attached double at least in the radial direction within the flywheel that constitutes a rotor 1, and stator cores 7a and 7b are arranged at least double so as to face the magnets. Hereby, the magnet-type generator, which is excellent in weight balance without wasteful space by increasing its electric power generation while getting desired inertial moment, can be obtained. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a magnet generator, and more particularly to a magnet generator driven by an engine.

The magnet generator is composed of a rotor and a stator. A plurality of magnets are alternately arranged NS on the rotor. The stator has a coil wire wound around an iron core.
The rotor is fastened to the crankshaft of the engine, and the stator is fixed on the engine side so that the stator iron core faces a magnet mounted on the rotor. When the rotor rotates, a current is generated in the stator side coil facing the magnet.
On the other hand, the rotor of the magnet generator also has a function as a “flying wheel” that suppresses uneven rotation of the engine. In an engine such as a marine outboard motor, where the external load fluctuates greatly, the function as the flywheel is important in order to maintain smooth and stable engine rotation. Further, the function as a flywheel increases as the moment of inertia of the flywheel increases.
In recent years, the total power consumption of a vehicle equipped with a generator has increased due to the increase in electrical components used, and an increase in the amount of power generation is required.
Conventionally, as a method of increasing the generated current of the generator, the size of the flywheel and the magnet and the corresponding stator core size are increased to increase the change in magnetic flux.
As another method, as shown in Patent Document 1, there is known a method in which two flywheels are arranged at the tip of a crankshaft and corresponding stators are installed, and the generated currents are summed and output.

Japanese Patent Laid-Open No. 10-4650

  The moment of inertia of the flywheel is proportional to the product of the weight of the rotor and the square of the distance to the center of the rotating shaft. When the crankshaft is extended and the flywheels are double-attached in the axial direction as in the prior art, or when the flanges are attached to both the inside and outside, the power generation requirement is satisfied and the moment of inertia increases temporarily. However, there is a demand for further increasing the moment of inertia. In order to respond to this, there is a problem that a wasteful space is generated when the diameter of the flywheel is increased.

  In order to solve the above-mentioned problem, a plurality of magnets are composed of a rotor that is installed in an annular shape on a flywheel around a rotation axis, and a plurality of stator cores that are wound with coils that are installed to face these magnets. In a magnet generator, a magnet is attached to one flywheel at least twice in the radial direction, and a stator core around which a coil is wound at least twice is arranged so as to face the magnet.

  By applying the present invention, it is possible to balance the demand for the moment of inertia and the demand for the amount of power generation in a balanced manner without generating a useless space.

Embodiment 1 FIG.
FIG. 1 shows the structure of a magnet generator according to Embodiment 1 of the present invention.
The generator rotor 1 has a predetermined number of magnets 4a and 4b arranged in a circumferential circle on the inner peripheral surfaces of the outer flange portion 2 and the inner flange portion 3 of the flywheel. On the engine block 5 side, a predetermined number of stator cores 7a and 7b that are opposed to the magnets 4a and 4b of the rotor 1 when the rotor 1 is fastened to the crankshaft 6 are attached in a circular shape. When the rotor 1 fastened to the crankshaft 6 rotates, current is generated in the coils 8a and 8b wound around the stator cores 7a and 7b. The current generated in the coil 8a is output from the current lead line together with the current generated in the coil adjacent in the circumferential direction around the rotation axis. The same applies to the current generated in the coil 8b.

  Here, in Patent Document 1, it is considered that two generators are constituted by two flywheels arranged in the axial direction, and one generator among them and the generator of this embodiment are described. Compare the space formed by the flywheel, the moment of inertia of the rotor and the generated power. The flywheel of this embodiment has a radius twice that of Patent Document 1 and has the same axial dimension.

Since the space formed by the flywheel is proportional to the square of the radius, the space formed by the flywheel of this embodiment is quadrupled.
The generated voltage E of the generator is given by E = Bvl. B is the magnetic flux density, v is the speed at which the magnetic flux traverses the coil, and l is the length of the coil. The generated power is proportional to the square of the generated voltage E.
Assuming that the radius of the outer flange portion 2 of this embodiment is twice that of Patent Document 1, the speed at which the magnetic flux of the magnet 4a crosses the coil 8a is Twice as much. Further, since the radius is doubled, the number of magnets 4a and coils 8a can be doubled (or the number is the same and the size is doubled), so the coil length linked with the magnetic flux is doubled. Therefore, the voltage generated in the coil 8a is 4 times and the power is 16 times. If the radius of the inner flange portion 3 is equal to that of Patent Document 1, the voltage and power generated in the corresponding coil 8b are equal to those of Patent Document 1. If it does so, the sum total of the electric power which generate | occur | produces in the coils 8a and 8b of this embodiment will be 17 times the thing of the patent document 1. FIG. In the rotor of this embodiment, the radius is twice that of Patent Document 1 and the mass is about four times, so the moment of inertia is about 16 times.

As described above, the generator of this embodiment is four times as large as the one of the two generators arranged in the axial direction of Patent Document 1, the space is 4 times, the generated power is 17 times, and the moment of inertia is It will be about 16 times. Therefore, the generator of this embodiment is twice the space, 8.5 times the generated power, and about 8 times the moment of inertia compared to the two generators arranged in the axial direction of Patent Document 1. Doubled. That is, by doubling the space, the generated power and the moment of inertia can be increased by about 8 times, so that the space efficiency has been remarkably improved.
Thereby, the request | requirement of electric power generation amount and the request | requirement of a moment of inertia can be reconciled with sufficient balance.

In addition, in the conventional technique shown in Patent Document 1, since the center of gravity of a heavy flywheel moves in the direction of the shaft tip, the burden on the rotating shaft increases, resulting in an increase in shaft rigidity and weight. was there. Furthermore, if the flywheel is doubled, first the engine side stator is attached, then the flywheel is attached, then the outer flywheel and then the outer stator are attached in that order, and the work becomes complicated. There is also a problem that this process is required separately.
By applying the present invention, there is no need to extend the shaft in the axial direction of the crankshaft, increasing the diameter of the crankshaft, increasing the overall weight of the engine, and increasing the generated current while minimizing the occupied space It becomes.
In addition, since a heavy object can be installed in the immediate vicinity of the engine, the load on the tip of the clan shaft in the direction of gravity can be reduced, and the space of the entire engine can be saved.
In addition, after attaching all the stators to the engine at once, it is only necessary to attach a flywheel and align the shaft, so that all the processes can be completed once and the assembly process can be simplified. .

Embodiment 2. FIG.
FIG. 2 shows the structure of a magnet generator according to Embodiment 2 of the present invention.
A rotor 1a of this generator has a predetermined number of magnets 4c and 4d arranged in a circumferential circle on the inner peripheral surface and the outer peripheral surface of a flange portion 2a of a flywheel. A predetermined number of stator cores 7c, 7d facing the magnets 4c, 4d of the rotor 1a when the rotor 1a is fastened to a crankshaft (not shown) are attached to the engine block (not shown) in a circular shape. is there. When the rotor 1a fastened to the crankshaft rotates, a current is generated in the coils 8c and 8d wound around the stator cores 7c and 7d. The current generated in the coil 8c is output from the current lead line together with the current generated in the coil adjacent in the circumferential direction around the rotation axis. The same applies to the current generated in the coil 8d. The magnet generator according to the second embodiment has an advantage that the power generation amount can be increased without changing the size of the flywheel in addition to the same effects as those of the first embodiment.

Embodiment 3 FIG.
FIG. 3 shows the structure of a magnet generator according to Embodiment 3 of the present invention.
A rotor 1b of this generator has a predetermined number of magnets 4e and 4f arranged in a circular shape in the circumferential direction inside a disk portion 9 of a flywheel. A predetermined number of stator cores 7e and 7f facing the magnets 4e and 4f of the rotor 1b when the rotor 1b is fastened to a crankshaft (not shown) are attached to the engine block (not shown) in a circular shape. is there. When the rotor 1b fastened to the crankshaft rotates, a current is generated in the coils 8e and 8f wound around the stator cores 7e and 7f. The current generated in the coil 8e is output from the current lead line together with the current generated in the coil adjacent in the circumferential direction around the rotation axis. The same applies to the current generated in the coil 8f. Thereby, the same effect as in the first embodiment can be obtained.

Embodiment 4 FIG.
FIG. 4 shows the structure of a magnet generator according to Embodiment 4 of the present invention.
The generator rotor 1c has a predetermined number of magnets 4g and 4h arranged in a circumferential circle on the inner peripheral surfaces of the outer flange portion 2b and the inner flange portion 3b of the flywheel. On the engine block side, stator cores 7g and 7h having a predetermined number of sizes facing the magnets 4g and 4h of the rotor 1c when the rotor 1c is fastened to a crankshaft (not shown) are attached in a circular shape. It is. When the rotor 1c fastened to the crankshaft rotates, a current is generated in the coils 8g and 8h wound around the stator cores 7g and 7h. The current generated in the coil 8g is output from the current lead line together with the current generated in the coil adjacent in the circumferential direction around the rotation axis. The same applies to the current generated in the coil 8h. In addition to the same effects as those of the first embodiment, the magnet generator according to the fourth embodiment changes the size of the stator cores 7g and 7h to change the magnet generator satisfying a desired power generation amount to a flywheel. Can be provided without changing the size. Thereby, the variation of the product which uses a common component can be increased, and manufacturing cost can also be reduced.

It is a cross-sectional view of the magnet type generator in Embodiment 1 of this invention. It is a cross-sectional view of the magnet type generator in Embodiment 2 of this invention. It is a cross-sectional view of the magnet type generator in Embodiment 3 of this invention. It is a cross-sectional view of the magnet type generator in Embodiment 4 of this invention.

Explanation of symbols

1, 1a, 1b, 1c rotor, 2, 2b outer flange, 2a flange,
3, 3b inner flange, 4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h magnet, 5 engine block, 6 crankshaft,
7a, 7b, 7c, 7d, 7e, 7f, 7g, 7h Stator core,
8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h Coil, 9 disc part.

Claims (6)

A magnet generator having a stator comprising a plurality of magnets arranged in a ring on a flywheel with a rotation axis as a center, and a stator composed of a plurality of stator cores wound with coils and disposed opposite to the magnets. The magnet generator according to claim 1, wherein the magnet and the stator core are each installed at least twice on a concentric circumference with the rotation axis as a center. The magnet generator according to claim 1, wherein the magnet is installed in parallel with a rotating shaft on a flange portion provided in a double on the flywheel. The magnet generator according to claim 1, wherein the magnet is installed in parallel with the rotation shaft on an inner peripheral surface and an outer peripheral surface of the flywheel flange portion. The magnet generator according to claim 1, wherein the magnet is installed on a flywheel disk perpendicularly to the rotation axis direction. The magnet generator according to any one of claims 1 to 4, wherein coils of fixed iron cores arranged adjacent to each other on concentric circles are connected to each other and provided with a current lead wire. The magnet generator according to any one of claims 1 to 5, wherein at least one of the stator cores adjacent to each other in the radial direction of the rotor has a size different from that of the other stator cores.

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