JP3702941B2 - Magnet generator rotor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotor of a magnet generator provided with a magnet protective cover that covers the surface of a permanent magnet in a yoke.
[0002]
[Prior art]
A conventional rotor of this type of magnet generator includes a yoke in which a side opposite to the opening end of the cylindrical portion is closed at the bottom, and a cylindrical boss projects from the center of the bottom portion into the cylindrical portion, and the yoke It was the structure provided with the permanent magnet supported by the inner periphery of this cylinder part, and the magnet protective cover which covers the surface of a permanent magnet in a yoke.
[0003]
In such a rotor yoke, a stator (armature), in which a stator coil (armature coil) is wound around a stator core (armature core), the convex pole of the stator core is used as a permanent magnet. Magnet generators are formed so as to face each other.
[0004]
In recent years, with the miniaturization and high output of the magnet generator, the heat generation of the stator coil tends to increase. Conventionally, in order to suppress this heat generation, measures such as changing the winding specifications, impregnation of the coils, and changing the insulation specifications between the coil and the iron core to increase the heat dissipation efficiency to suppress the coil current density and resistance loss. However, because the structure of the stator core and the change of the stator coil are limited in a limited space in the yoke, use a coil with higher heat resistance rank that has a higher heat resistance rank of the coil coating to prevent coil burnout. We often take measures to prevent it.
[0005]
[Problems to be solved by the invention]
However, there is a limit to the heat resistance of the coil, and there is a case where there is no room for the heat resistant temperature, and there is a problem that cannot be dealt with.
[0006]
An object of the present invention is to provide a rotor of a magnet generator that can suppress a temperature rise of a stator coil regardless of the rotation direction of the yoke .
[0007]
Another object of the present invention is to provide a rotor of a magnet generator capable of reducing the centrifugal force of air or oil acting on each air blowing protrusion.
[0008]
It is another object of the present invention to provide a rotor for a magnet generator in which each blower projection can be easily formed using a magnet protective cover.
[0009]
[Means for Solving the Problems]
The present invention provides a yoke in which the opposite side to the opening end of the cylindrical part is closed at the bottom, a cylindrical boss is provided at the center of the bottom, and a permanent magnet supported on the inner periphery of the cylindrical part of the yoke , e Bei a magnet protection cover and an annular bottom portion for covering the bottom portion of the cylindrical portion and the yoke to cover the surface of the permanent magnet in the yoke, intermittently in the circumferential direction in the annular bottom portion of the magnet protection cover The rotor of the magnet generator in which a plurality of air-projecting protrusions are projected is provided as an object of improvement.
[0010]
In the rotor of the magnet generator according to claim 1, there are two kinds of the forward air blowing protrusion and the reverse air blowing protrusion so that the air blowing protrusion can perform air blowing in both the forward rotation and the reverse rotation of the yoke. , On two circumferences of which the positions of the annular bottom portions are different from each other in the radial direction, intermittently in the circumferential direction, the blowing projection on one circumference is between the neighboring blowing projections on the other circumference. It is characterized by being fixed as it exists .
[0011]
With this arrangement, the stator coil can be cooled by either the forward rotation protrusion or the reverse rotation protrusion even when the yoke rotates in either the forward direction or the reverse direction. Since each air-projection protrusion is provided using a magnet protective cover, an increase in cost can be suppressed.
[0012]
The rotor of the magnet generator according to claim 2 is characterized in that, in claim 1, the top part of each blower projection is tapered so that the central side of the yoke is low and the outer peripheral side of the yoke is high. To do.
With this configuration, it is possible to reduce the centrifugal force of air or oil that acts on each blowing projection.
According to a third aspect of the rotor of the magnet generator of the present invention, in the first or second aspect, each of the air blowing projections is formed by being cut and raised from the annular bottom portion.
If it has become like this, each ventilation protrusion can be easily formed with a press etc. using a magnet protection cover.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 show an example of an embodiment of a rotor of a magnet generator according to the present invention, FIG. 1 is a front view of the rotor of a magnet generator of this example, and FIG. 1 is a cross-sectional view taken along the line XX of FIG. 1 in an assembled state, and FIG. 3 is a side view of a blower projection used in this example.
[0014]
The rotor 1 of the magnet generator of this example includes a yoke 2 formed of a magnetic material. The yoke 2 has a structure in which the side opposite to the opening end of the cylindrical portion 2a is closed by a bottom portion 2b, and a cylindrical boss 2c is provided at the center of the bottom portion 2b. The cylindrical boss 2c is fitted and fixed to a rotating shaft such as a crankshaft of an internal combustion engine (not shown) so that the yoke 2 rotates together with the rotation of the rotating shaft. A plurality of arc-shaped permanent magnets 3 are fixed to the inner periphery of the cylindrical portion 2a of the yoke 2 by bonding or the like along the circumferential direction. These permanent magnets 3 are magnetized in the radial direction of the yoke 2 so that magnetic poles having different polarities are arranged in the circumferential direction of the cylindrical portion 2a. A magnet protective cover 4 made of a thin nonmagnetic material that protects each permanent magnet 3 is provided in the yoke 2 on the inner periphery of the cylindrical portion 2a. The magnet protective cover 4 has an annular shape that covers a cylindrical portion 4 a that covers the surface of each permanent magnet 3, a flange portion 4 b that covers the end face of each permanent magnet 3 on the open end side of the cylindrical portion 2 a, and a bottom portion 2 b of the yoke 2. The bottom portion 4c is integrally formed. In such a magnet protective cover 4, the cylindrical portion 4 a and the flange portion 4 b are fixed to each permanent magnet 3 by adhesion or caulking.
[0015]
The annular bottom portion 4c of the magnet protection cover 4 has a plurality of forward blowing projections 5 and a plurality of reverse blowing projections 6 that are different in direction so that air can be blown in either case of forward rotation or reverse rotation of the yoke 2. Are intermittently provided in the circumferential direction on two circumferences having different positions in the radial direction. In the present example, the plurality of forward blowing projections 5 are provided in the circumferential direction at an angle of α = 45 °, and the plurality of reverse rotation blowing projections 6 are provided in the circumferential direction at an angle of β = 45 °. The forward blowing fan projection 5 and the reverse blowing fan protrusion 6 are formed by cutting and raising from the annular bottom portion 4 c of the magnet protection cover 4. The forward blowing projection 5 and the reverse blowing projection 6 are cut and raised from opposite directions. The cut-and-raised angle is preferably about 45 ° to 60 ° although not shown. Further, as shown in FIG. 3, the forward air blowing protrusion 5, the reverse air blowing protrusion 6, and the apexes 5a, 6a are tapered at an angle of θ so that the center side of the yoke 2 is low and the outer peripheral side of the yoke 2 is high. It has become.
[0016]
In such a rotor yoke 2, a stator coil (armature coil) 8 is wound around a plurality of convex poles 7 a provided on the outer periphery of an annular stator core (armature core) 7. A stator (armature) 9 is disposed so that the convex pole 7a of the stator core 7 faces the permanent magnet 3, and is fixed to a crankcase or the like of an internal combustion engine (not shown). The above-described forward blowing protrusion 5 and reverse blowing protrusion 6 are provided at positions that can face the stator coil 8.
[0017]
A magnet generator is formed by the rotor 1 and the stator 9.
[0018]
In this way, when the plurality of forward blowing projections 5 and the reverse blowing projections 6 are provided intermittently in the circumferential direction on the annular bottom portion 4 c of the magnet protection cover 4, the rotation of the magnet protection cover 4 accompanying the rotation of the yoke 2. Thus, any one of the forward blowing projection 5 and the reverse blowing projection 6 at the bottom generates wind and blows air to the stator coil 8 of the stator 9, and cools the stator coil 8 to generate heat. Can be suppressed. Since the forward air blowing protrusion 5 and the reverse air blowing protrusion 6 are provided by using the magnet protective cover 4, an increase in cost can be suppressed.
[0019]
In particular, as in this example, when the yoke 2 is provided with two types of the forward blowing projection 5 and the reverse blowing projection 6, the stator coil can be used regardless of whether the yoke 2 rotates in the forward or reverse direction. 8 can be cooled.
[0020]
Further, when the top portions 5a and 6a of the forward blowing fan projection 5 and the reverse blowing fan projection 6 are tapered so that the center side of the yoke 2 is low and the outer peripheral side of the yoke 2 is high, 6 can reduce the centrifugal force of air or oil (when the yoke 2 has two vertical orientations as shown in FIG. 2 and its lower part is placed in the oil).
[0021]
Further, when the forward blowing boss 5 and the reverse blowing boss 6 are formed by cutting and raising from the annular bottom portion 4c, the blast protrusions 5 and 6 are easily formed by pressing or the like using the magnet protective cover 4. can do.
[0022]
When the rotation of the yoke 2 is determined to be either normal rotation or reverse rotation, either one of the normal rotation air blowing protrusion 5 and the reverse rotation air blowing protrusion 6 may be provided depending on the rotation direction. .
[0023]
Further, the forward air blowing protrusion 5 and the reverse air blowing protrusion 6 can be fixed to the annular bottom portion 4c by adhesion, welding, or the like in addition to being cut and raised from the annular bottom portion 4c.
[0024]
【The invention's effect】
In the rotor of the magnet generator according to claim 1, the two types of the forward air blowing protrusion and the reverse air blowing protrusion are annular bottom portions so that the air blowing protrusion can perform air blowing in both the forward rotation and the reverse rotation of the yoke. On two circumferences whose positions are different from each other in the radial direction, the airflow projections on one circumference are fixed intermittently in the circumferential direction so that they exist between adjacent airflow projections on the other circumference. because it is set, it is possible to yoke forward, be rotated in either direction reverse, by either the normal rotation blast projections and the reverse rotation for blowing projections for cooling the stator coil. Since each air-projection protrusion is provided using a magnet protective cover, an increase in cost can be suppressed.
[0025]
In the rotor of the magnet generator according to claim 2, since the top part of each blowing projection is tapered so that the central side of the yoke is low and the outer peripheral side of the yoke is high, the air acting on each blowing projection Or the centrifugal force of oil can be softened.
In the rotor of the magnet generator according to claim 3, each blowing projection is formed by cutting and raising from the annular bottom, so each blowing projection is easily formed by pressing or the like using a magnet protective cover. be able to.
[Brief description of the drawings]
FIG. 1 is a front view showing an example of an embodiment of a rotor of a magnet generator according to the present invention.
2 is a cross-sectional view taken along the line XX of FIG. 1 in a state in which a stator is incorporated.
FIG. 3 is a side view of a blowing projection used in this example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotor 2 Yoke | cylinder part 2b Bottom part 2c Boss 3 Permanent magnet 4 Magnet protective cover 4a Cylindrical part 4b Gutter part 4c Annular bottom part 5 Forward rotation protrusion 6 Reverse rotation protrusion 5a, 6a Top part 7 Stator core (armature Iron core)
7a Convex pole 8 Stator coil (armature coil)
9 Stator (armature)

Claims (3)

A yoke opposite to the opening end of the cylindrical portion is closed at the bottom, a yoke having a cylindrical boss provided at the center of the bottom, a permanent magnet supported on the inner periphery of the cylindrical portion of the yoke, and the yoke Bei example a magnet protection cover provided with said annular bottom portion for covering the bottom portion of the cylindrical portion and the yoke to cover the surface of the permanent magnet in the inner, the in the annular bottom portion of the magnet protection cover circumferentially intermittently In the rotor of the magnet generator in which a plurality of air blowing protrusions are provided ,
Two circles, the forward air blowing protrusion and the reverse air blowing protrusion, are arranged in two different positions in the radial direction of the annular bottom so that the air blowing protrusion can blow air in either the forward rotation or the reverse rotation of the yoke. On the circumference, intermittently in the circumferential direction, the air blowing protrusions on one circumference are fixed so as to exist between adjacent air blowing protrusions on the other circumference. Magnet generator rotor. 2. The rotor of a magnet generator according to claim 1, wherein a top portion of each of the air blowing protrusions is tapered so that a central side of the yoke is low and an outer peripheral side of the yoke is high . The rotor of a magnet generator according to claim 1 or 2, wherein each of the air blowing protrusions is formed by cutting and raising from the annular bottom portion .

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