JP2007104887A - Multipolar permanent magnet generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify difficulties of manufacture and to improve a material utilization rate of magnets by adhering the magnets of rare-earth metal in a bowl body which constitutes a rotor of a multipolar permanent magnet generator, and forming the magnets into a rectangular thin strip structure. <P>SOLUTION: The generator includes a stator 2 and the rotor 1 which is coupled rotatably to the stator through a shaft, wherein the stator includes an iron core 7 having a salient-pole structure, and a coil 8 wound around the iron core to output a current. The rotor includes a central portion 3 connected to an external power source, a bowl body 4 which is arranged at an outer peripheral side of the stator, and is connected to the central portion, and a plurality of magnet units 14 which are adhered inside the bowl body, respectively. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a magnet generator, and more particularly to a magnet generator that uses a magnet unit having a plurality of rectangular magnets individually.

In general, small or special means of transportation such as motorcycles and trucks are generally equipped with a generator driven by a small engine, usually a permanent magnet induction permanent magnet generator, There is a casing in which a magnet generator can be installed. For example, a ferrate magnet is used for the permanent magnet generator, or a ferrite magnet (ferrite magnet) that is currently used as a mainstream. ing.
The permanent magnet generator includes a rotor and a stator, and a plurality of sets of magnets are arranged at equal intervals in the rotor and fixed on the inner peripheral edge of the yoke. In the stator assembly method, a plurality of coils surrounds a plurality of radiating portions of a single iron core, so that when the rotor is partially driven by the engine and rotated around the stator, the stator is fixed. An electromotive force is excited in each coil arranged at the magnetic pole location of the child.
As a magnet generator for connecting a mounted engine to a two-wheeled motor vehicle, a rotor having a plurality of magnets arranged around a yoke generally formed in a bowl shape is usually used as a yoke generator armature. It is mounted around and rotates.
Conventional permanent magnet generators in the prior art have a complicated structure and are expensive to manufacture. Usually, the magnets used therein are general ferrite magnets (ferrite magnets). Due to its finite magnetic flux density and coercive force, it is necessary to propose a novel permanent magnet generator structure in order to obtain a generator with small volume, high performance and reasonable cost .
JP2003-324922 JP 2005-318685 A

Therefore, the present invention has been submitted on the basis of the problems in the above-mentioned known technology, and an object of the present invention is to provide a structure of a multipole permanent magnet generator, in which the magnetic pole structure is modified and the magnet Since the manufacturing method is simplified and the usage rate of the material is improved, the cost for manufacturing the magnet generator is reduced.
A magnet generator provided in the present invention includes a stator having a salient pole structure, a stator that surrounds the outside of the salient pole structure, and a coil for outputting current, and is axially coupled to the stator. A rotor that is connected to an external power source, and a bowl body that is positioned around the stator and is connected to the center, A plurality of magnet units that are in close contact with the inside of the bowl body are included.
In the magnet generator provided in the present invention, the central portion is provided with a gradient hole for connection to the external power source, and the bowl body is fixedly connected to the central portion with a rivet. The rotor further includes a magnet cover that covers the bowl body, and the rectangular magnet is housed in a space formed inside the bowl body. The external power source is used to generate a current in the coil by moving the rotor relative to the stator. The salient pole structure includes a radial salient pole structure, and each of the plurality of magnet units includes two rectangular magnets. In addition, the rectangular magnet includes a rare earth magnet, its outer diameter is preferably 110 mm, and its thickness is preferably 2.4 mm. Furthermore, the magnetic pole angle of the rectangular magnet is about 20 degrees, and the arrangement of the rectangular magnets is symmetric with respect to the center line of the bowl body, and the center line is parallel to the rotation axis of the rotor.

In order to solve the above-mentioned problem, the invention according to claim 1 is directed to a stator including an iron core having a salient pole structure and a coil for outputting a current wound around the iron core, and the stator. A rotor that is rotatably coupled to the shaft, and the rotor has a central portion that is coupled to an external power source and an outer peripheral surface side of the stator and is coupled to the central portion. And a plurality of magnet units that are in close contact with the inside of the bowl body.
According to a second aspect of the present invention, in the magnet generator according to the first aspect, the central portion is provided with a gradient hole for connection to the external power source.
According to a third aspect of the present invention, in the magnet generator according to the first or second aspect, the bowl body is fixedly connected to the central portion by a rivet.
According to a fourth aspect of the present invention, in the magnet generator according to the first, second, or third aspect, the rotor further includes a magnet cover disposed in proximity to the inner surface of the bowl body, and The rectangular magnet is housed in a space formed between the inner surface of the bowl body and the outer surface of the magnet cover.
According to a fifth aspect of the present invention, in the magnet generator according to any one of the first to fourth aspects, the external power source moves the rotor relative to the stator to move the rotor inside the coil. Used to generate a current.
The invention according to claim 6 is the magnet generator according to any one of claims 1 to 5, wherein the iron core having the salient pole structure includes a radial salient pole structure. To do.
The invention described in claim 7 is the magnet generator according to any one of claims 1 to 6, wherein each of the plurality of magnet units includes two rectangular magnets. And
According to an eighth aspect of the present invention, in the magnet generator according to the seventh aspect, the rectangular magnet includes a rare earth magnet.
The invention described in claim 9 is characterized in that an outer diameter of the rectangular magnet is 110 mm in the magnet generator according to claim 7 or 8.
A tenth aspect of the present invention is the magnet generator according to the seventh, eighth, or ninth aspect, wherein the rectangular magnet has a thickness of 2.4 mm.
An eleventh aspect of the present invention is the magnet generator according to any one of the seventh to tenth aspects, wherein the magnetic pole angle of the rectangular magnet is 20 degrees.
The invention described in claim 12 is the magnet generator according to any one of claims 7 to 11, wherein the arrangement of the rectangular magnets is symmetric with respect to the center line of the bowl body, and the center line Is parallel to the rotation axis of the rotor.

  The present invention will be described in detail with reference to the appropriate examples and the accompanying drawings as follows, but all of the appropriate examples in the present invention are for illustration only, and in addition to the appropriate examples in the text, the present invention has other examples. In addition, it can be widely applied. Further, the present invention is not limited to any embodiment, but should be determined by the appended claims and their equivalent regions.

First, FIG. 1 shows a cross-sectional view of a permanent magnet generator according to the present invention. The generator includes a rotor 1 and a stator 2, and the rotor 1 includes a center portion 3 and a bowl body 4. The central portion 3 is provided with a gradient hole 9 for connecting the rotation shaft of an external engine to follow the rotation of the rotor 1. The coupling between the center portion 3 and the bowl body 4 is performed via a rivet that passes through the rivet hole 11. The inner surface of the bowl body 4 forms a storage space for arranging the magnets 5 with the outer surface of the cylindrical magnet cover 6. The magnets 5 are arranged in a magnetically intersecting manner, and are also fixed in a storage space inside the bowl body 4 by an adhesive.
The stator 2 is radially formed on the outer side of the central axis, has a salient pole structure including an armature core 7 composed of a base iron plate, and includes a coil 8 on each salient pole, and each salient pole. Surrounding. Since the stator 2 is fixed to the external engine side by screws, when the external engine rotates, the rotor 1 is driven to rotate around the central portion 3 and the magnet 5 located inside the bowl body 4 at the central portion 3. And the coil 8 on the salient poles of the stator 2 generate a current in the coil 8.

FIG. 2A is an enlarged cross-sectional view of the inner side surface portion of the bowl body 4, and a cross-sectional view along the line ZZ is shown in FIG. In FIG. 2B, the inner surface of the bowl body 4 has an arc shape and forms a space for accommodating the magnet 5 with the outer surface of the magnet cover 6. Usually, the magnet 5 is an arc magnet having an angle θ (referred to as a magnetic pole angle) and symmetric with respect to the center line L, and is a space formed between the inner surface of the bowl body 4 and the outer surface of the magnet cover 6. The magnetic pole angle is determined by the number of magnetic poles to be designed. In FIG. 2A, the thickness (width) of the magnet 5 parallel to the axis and facing the magnetic core is We, and one end of the magnet cover 6 is fixedly connected to the bowl body 4; Since the other end can be brought into contact with the protruding structure at the end of the bowl body 4, a magnet housing space is formed.
In general terms, the arc magnet 5 can include a rare earth magnet, which has the property of high magnetic flux density, so the performance of the generator with the rare earth magnet is usually relatively good. However, because of its high price, the production cost of this type of magnet power generation is higher than that of a generator using ordinary ferrite.

3A and 3B are structural views of a bowl body of a magnet generator according to the present invention. According to FIG. 3 (B), in the permanent magnet generator in the present invention, the first magnet 12 and the second magnet 13 are included in the storage space inside the bowl body 4. 13 forms a set of magnet units. The first magnet 12 and the second magnet 13 each have a rectangular cross section, are located on both sides of a symmetrical center line L in the storage space, are fixed in the storage space in an adhesive manner, and The arrangement method of the first and second magnets is symmetric with the center line L of the bowl body 4, and the center line is parallel to the rotation axis of the rotor 1. Since the arcuate angle of the arcuate space formed by the outside of the magnet cover 6 and the inside of the bowl body 4 is θ, the arcuate angles of both side spaces symmetrical to the center line L are both θ / 2.
The reason why the rectangular magnet is replaced by the arc magnet in the present invention is that the rectangular magnet has an advantage that it is easy to manufacture, and it has a relatively high material usage rate (weight / weight of manufacturing material). Since the weight of input material × 100) is provided, the manufacturing cost of the permanent magnet generator can be effectively reduced. Simply replacing the original arc-shaped magnet with a rectangular magnet, the volume of the magnet is greatly increased to 61% of the original volume in order to smoothly fit into the arc-shaped storage space. Therefore, the material cannot be practically used by increasing the effective usage rate. In the permanent magnet generator of the present invention, since the volume reduction rate of the magnet is considerably low (about 91% of the original volume), the influence of the volume reduction on the modification of the magnetic field is very small. In addition, the first magnet 12 and the second magnet 13 may include a rare earth magnet.
In the embodiment according to the present invention, the stator 2 of the magnet generator of the present invention is provided with salient pole structures formed radially outward from the central axis as shown in FIG. Yes. Among them, each radial salient pole structure is composed of an armature core 7 and a coil 8 each composed of a base iron plate.

FIG. 4 further shows an embodiment of the rotor 1 according to the present invention. The rotor 1 includes a central portion 3 and a bowl body 4. A magnet unit 14 is constituted by two identical magnets 14a and is arranged in close contact with the inner surface of the bowl body 4 in parallel. Two adjacent magnets 14a have opposite polarities. The rotor 1 shown in FIG. 4 can cover the stator 2 shown in FIG. 4, and both are coaxially coupled with each other at the rotation axis, and when the rotor 1 rotates. The magnet unit 14 therein and the coil 8 on the salient pole structure of the stator 2 perform mutual movement to generate a current.
The embodiment according to the present invention is used in a multi-pole permanent magnet generator used on a two-wheeled motor vehicle, and the permanent magnet used therein is a rare earth magnet, and includes a neodymium magnet (Neodyminum). The generator has two rectangular magnets on the rotor bowl, the outer diameter is 110 mm, the magnet thickness is 2.4 mm, and the magnetic pole angle is 20 degrees.

As described above, the multipole permanent magnet generator according to the present invention is easier to manufacture than conventional arc magnets and has a relatively high material usage rate. The cost required for this can be effectively reduced. Moreover, in the multipolar permanent magnet generator based on the present invention, a rare earth magnet having a relatively high magnetic flux and magnetic flux density is used to replace the conventional ferrite magnet, and the function of the generator is effectively improved. It is possible to sufficiently satisfy the demand that the generator has a small volume, high performance and economy.
For engineers who are familiar with the technical field, the present invention has been described with respect to proper embodiments as described above, but this does not limit the spirit of the present invention. Revisions and similar arrangements made without departing from the spirit and scope of the present invention should be included in all the following claims, and the scope covers all similar revisions and similar structures. And should be interpreted most widely.

It is sectional drawing of the generator to which this invention is applied. (A) is sectional drawing along the axial direction of the bowl body in FIG. 1, (B) is sectional drawing along the ZZ line of the bowl body. (A) is sectional drawing along the axial direction of the bowl body in this invention, (B) is sectional drawing along the ZZ line of the bowl body. It is a perspective view of a magnet generator stator and a magnet generator rotor in the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor, 2 Stator, 3 Center part, 4 Bowl body, 5 Magnet, 6 Magnet cover, 7 Iron core, 8 Coil, 9 Gradient hole, 11 Rivet hole, 12 1st magnet, 13 2nd magnet, 14 Magnet unit .

Claims (12)

  An iron core having a salient pole structure, a stator including a coil for outputting a current wound around the iron core, and a rotor rotatably coupled to the stator. Are a central portion coupled to the external power source, a bowl body disposed on the outer peripheral surface side of the stator and coupled to the central portion, and a plurality of units in close contact with the inside of the bowl body A magnet generator comprising: a magnet unit.   The magnet generator according to claim 1, wherein the central portion is provided with a gradient hole for connection to the external power source.   The magnet generator according to claim 1 or 2, wherein the bowl body is fixedly connected to the central portion by a rivet.   The rotor further includes a magnet cover disposed close to the inner side surface of the bowl body, and the rectangle is formed in a space formed between the inner side surface of the bowl body and the outer side surface of the magnet cover. The magnet generator according to claim 1, wherein the magnet generator is housed.   5. The external power source is used to generate a current in the coil by moving the rotor relative to the stator. 6. Magnet generator.   The magnet generator according to any one of claims 1 to 5, wherein the iron core having the salient pole structure includes a radial salient pole structure.   The magnet generator according to claim 1, wherein each of the plurality of magnet units includes two rectangular magnets.   The magnet generator according to claim 7, wherein the rectangular magnet includes a rare earth magnet.   The magnet generator according to claim 7 or 8, wherein an outer diameter of the rectangular magnet is 110 mm.   The magnet generator according to claim 7, 8 or 9, wherein the rectangular magnet has a thickness of 2.4 mm.   The magnet generator according to any one of claims 7 to 10, wherein a magnetic pole angle of the rectangular magnet is 20 degrees.   The magnet generator according to any one of claims 7 to 11, wherein the arrangement of the rectangular magnets is symmetrical with respect to a center line of the bowl body, and the center line is parallel to a rotation axis of the rotor. .

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