JP2005261046A - Rotor for magnetic generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor for magnetic generator which can prevent the occurrence of magnetic circuits in short circuit states between the adjacent magnets and the pole of a stator and the yoke of a rotor. <P>SOLUTION: The rotor 1 of the magnetogenerator is one where two or more magnets 12 are arranged circularly at the internal circumference, and the inner face 12a of each magnet 12 forms an opposite face to each pole 21 of the stator 2. This rotor is provided with gap increasing means 13 which increase the gap to each pole, at both ends in the rotational direction a of the inner face 12a of the magnet. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotor for a magnet generator in which a plurality of magnets are arranged in an annular shape on the inner periphery, and the inner surface of each magnet forms a surface facing each pole of a stator.

Conventionally, as a three-phase magnet generator, in order to improve the charging performance by increasing the output current on the low rotation side and to reduce the coil temperature by decreasing the output current on the high rotation side, the number of poles around which the coil is wound is 3n. A three-phase magnet generator having a (n: arbitrary natural number) stator and a rotor with 4n poles to which magnets are fixed has been proposed (for example, see Patent Document 1).
JP 2003-348784 A

  However, the conventional magnet type generator doubles the number of poles of the rotor from the conventional 2n to 4n, and the interval between adjacent magnets is reduced. Therefore, as shown in FIG. And a magnetic circuit that is short-circuited between the pole 21 of the stator 2 and the yoke 11 of the rotor 1, causing the following problems. That is, i) the coil temperature rises due to heat generated by the pole 21, ii) high-temperature demagnetization of the magnet 12 occurs due to heat generated by the magnet 12, the yoke 11, and the protective ring 13, and iii) power generation efficiency decreases due to increased iron loss. (Especially in the case of rare earth magnets, the residual magnetic flux density is high, so a large amount of magnetic flux flows, and the problem is great.) In FIG. 4, illustration of the coil is omitted.

  The present invention solves the problems of the prior art as described above, and can prevent the generation of a magnetic circuit that is short-circuited between adjacent magnets, a stator pole, and a rotor yoke. An object of the present invention is to provide a rotor. However, the present invention is not limited to the three-phase magnet generator as described above, and can be widely applied to magnet generators other than the three-phase magnet generator.

  The rotor of the magnet generator according to the present invention is the rotor of a magnet generator in which a plurality of magnets are arranged in an annular shape on the inner periphery, and the inner surface of each magnet forms a surface facing each pole of the stator. A gap increasing means for increasing a gap with each of the poles is provided at both ends in the rotation direction of the.

  According to the present invention, since the gap increasing means is provided at both ends in the rotation direction on the inner surface of the magnet, the magnetic resistance of the magnetic circuit using the adjacent magnet, the stator pole and the rotor yoke as a magnetic path is increased, and a short-circuit state occurs. Generation of a magnetic circuit can be prevented. For this reason, the coil temperature is lowered by reducing the heat generation of the stator poles, the high temperature demagnetization of the magnet is suppressed by reducing the heat generation of the magnet, yoke and protective ring, and the power generation efficiency is reduced by reducing the iron loss. To improve.

  If the gap increasing means is realized by configuring the inner surface of the magnet with a flat surface, the gap increasing means can be obtained by a simple operation of only polishing the outer diameter of the magnet.

  For example, the magnet generator is a three-phase magnet generator, the number of poles of the stator is 3n (n: any natural number), and the number of poles of the rotor is 4n.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a basic configuration diagram of a three-phase magnet generator incorporating a rotor according to an embodiment of the present invention, FIG. 2 is an enlarged view of a main part thereof, and FIG. 3 is for explaining the effect of the present invention. Each graph is shown.

  1 and 2, 1 represents a rotor, and 2 represents a stator (coils are omitted). The number of poles of the stator 2 is 3n (in the case of FIG. 1, n = 6 and the number of poles is 18.), and the number of poles of the rotor 1 is 4n (in the case of FIG. 1, n = 6 and the number of poles is 24.)

  The rotor 1 has a cylindrical yoke 11 on the outer peripheral portion, and a plurality (24 pieces) of magnets 12 are annularly arranged on the inner peripheral surface of the yoke 11 at equal intervals in the rotation direction. A protective ring 13 formed by pressing a stainless steel plate is fixed to the inner peripheral side of the magnet 12.

  The inner surface 12 a of each magnet 12 forms a surface facing each pole 21 of the stator 2. In the inner surface 12 a of each magnet 12, gap increasing means 3 for increasing the gap with each pole 21 of the stator 2 is provided at both ends in the rotational direction “a”. In the case of the present embodiment, the gap increasing means 3 is realized by configuring the inner surface 12a of the magnet 12 with a plane as shown in FIG. 2, and the conventional R-plane shape as shown in FIG. Compared with the magnet inner surface 12a, the gaps between the poles 21 of the stator 2 are increased at both ends in the rotational direction a of the magnets 12.

  As described above, in the rotor 1 of the magnet generator according to the present embodiment, a plurality of magnets 12 are annularly arranged on the inner periphery, and the inner surface 12a of each magnet 12 has a surface facing each pole 21 of the stator 2. It is a rotor of a magnetic generator to be formed, and is configured by providing gap increasing means 13 for increasing the gap with each pole 21 at both end portions in the rotation direction a on the magnet inner surface 12a.

  According to the present embodiment, the gap increasing means 13 is provided at both end portions in the rotation direction a on the magnet inner surface 12a, so that the magnetic circuit using the adjacent magnet 12, the pole 21 of the stator 2 and the yoke 11 of the rotor 1 as a magnetic path. The magnetic resistance increases, and the occurrence of a magnetic circuit that becomes a short circuit can be prevented. For this reason, the coil temperature is lowered by reducing the heat generation of the pole 21 of the stator 2, and the high temperature demagnetization of the magnet 12 is suppressed by reducing the heat generation of the magnet 12, the yoke 11 and the protective ring 13, and the iron The power generation efficiency is improved by reducing the loss. FIG. 3 shows the power generation efficiency of a magnet generator using a conventional magnet 12 in which the inner diameter R, that is, the inner surface 12a is formed on the R surface, and the magnet 12 of this embodiment in which the inner diameter straight, that is, the inner surface 12a is formed on a plane. Fig. 3 shows the experimental results of the power generation efficiency of the magnet generator. As is apparent from Fig. 3, the magnet generator of this embodiment has higher power generation efficiency than the conventional magnet generator. I understand.

  In the present embodiment, since the gap increasing means 13 is realized by configuring the magnet inner surface 12a as a flat surface, the gap increasing means 13 can be obtained by a simple operation of only polishing the outer diameter of the magnet 12.

  The gap increasing means 3 is not limited to the inner surface 12a of the magnet 12 configured as a plane, but may be configured as a curved surface, and both ends of the inner surface 12a of the magnet 12 in the rotational direction a. What is necessary is just to show the effect | action which increases the magnetic resistance between each pole 21 of the stator 2. FIG.

It is a basic lineblock diagram of the three phase magnet type generator with which the rotor concerning one embodiment of the present invention was built. It is the principal part enlarged view. It is a graph for demonstrating the effect of this invention. It is explanatory drawing of the problem of the conventional rotor.

Explanation of symbols

1 Rotor 11 Yoke 12 Magnet 12a Inner surface 2 Stator 21 Pole

Claims (3)

In the rotor of a magnet generator in which a plurality of magnets are arranged in an annular shape on the inner periphery, and the inner surface of each magnet forms a surface facing each pole of the stator,
A rotor for a magnet generator, wherein gap increasing means for increasing a gap with each of the poles is provided at both ends of the magnet inner surface in the rotational direction.   2. The rotor of a magnet generator according to claim 1, wherein the gap increasing means comprises a flat inner surface of the magnet.   3. The magnetic generator is a three-phase magnet generator, wherein the number of poles of the stator is 3n (n: an arbitrary natural number), and the number of poles of the rotor is 4n. Magnet generator rotor.

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