JP2002084728A - Outer rotor magnet rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an outer rotor magnet rotating machine which radiates heat of its stator better than before. SOLUTION: This rotating machine has the stator 3 composed by winding a coil 2 on each pole area 1a of a stator core 1, and a rotor 6 provided with a flywheel 4 which surrounds the periphery of the stator 3 and field magnets which are supported by the internal periphery of the flywheel 4 and are opposed to the pole areas 1a of the stator core 1. They are assembled protruding the stator 3 outside the flywheel 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer rotor type magnet rotating machine used as a generator or a motor.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional outer rotor type magnet rotating machine using a ferrite magnet as a field magnet.

[0003] This outer rotor type magnet rotating machine has a stator 3 in which a coil 2 is wound around each pole portion 1a of a stator core 1, and a flywheel 4 surrounding the outer periphery of the stator 3.
And a rotor 6 having a ferrite magnet 5A supported on the inner periphery thereof and facing the pole portion 1a of the stator core 1. A rotary shaft 8 is fixed to a boss 7 at the bottom of the flywheel 4 with bolts 7a. The structure has been. The boss 7 is exchangeably fixed to the bottom of the flywheel 4 with a screw 7b. The rotating shaft 8 rotatably passes through a central hole 9 of the stator core 1.

In such an outer rotor type magnet rotating machine, the positional relationship between the stator 3 and the flywheel 4 is generally such that the stator 3 is completely connected to the flywheel 4 as shown in FIG.
Was housed within.

However, in such a structure, the area where the stator 3 directly comes into contact with the outside air is small, and the temperature rise of the stator 3 is increased by the heat generated by the coil 2. Further, the temperature of the ferrite magnet 5A also increases due to heat conduction. Such an increase in the temperature of the coil 2 and the ferrite magnet 5A causes the output of the rotating machine to decrease.

On the other hand, as shown in FIG. 5, when a rare earth magnet 5B is used as a field magnet, the rare earth magnet 5B
Becomes shorter in the axial direction. Therefore, the axial length of the stator 3 is also reduced. However, since the amount of magnetic flux does not change before and after the magnet change, if the axial length of the stator 3 is reduced,
The magnetic flux density will increase. However, since the stator core 1 is originally used near the saturation magnetic flux density, if the cross-sectional area of the stator core 1 is further reduced, the magnetic flux density of the stator core 1 is saturated, and the axial length of the stator 3 is increased. After the change, the amount of magnetic flux decreases. As the magnetic flux of the stator core 1 decreases, the output of the rotating machine also decreases.

Therefore, the axial length of the stator 3 cannot be basically changed. Therefore, the flywheel 4 has a similar structure due to the common use thereof. Therefore, the cooling effect can be obtained only to the same degree as the conventional one.

As a solution to this problem, FIG.
As shown in FIG. 7B, a ventilation hole 10 is provided at the bottom of the flywheel 4 to directly radiate the coil 2 to the outside air to dissipate heat, and as shown in FIG. Ventilation holes 10, with fixing plate 11 to be fixed,
12 and a fan 13 provided on the inner surface of the bottom of the flywheel 4 to actively send air to the coil 2 and the ferrite magnet 5A for cooling. In FIG. 7, the stator core 1 is fixed to the outer periphery of a cylindrical boss 14 protruding from the fixing plate 11, and the rotating shaft 8 is passed through the boss 14 and rotatably supported by a bearing 15. .

[0009]

However, FIG.
In any of the outer rotor type magnet rotating machines shown in FIGS. 7A and 7B, since the outer periphery of the stator 3 is surrounded by the flywheel 4 in any case, there are problems such as poor heat radiation performance of the stator 3. there were.

An object of the present invention is to provide an outer rotor type magnet rotating machine capable of radiating heat from a stator better than before.

[0011]

SUMMARY OF THE INVENTION The present invention provides a stator having coils wound around respective poles of a stator core, a flywheel surrounding the outer periphery of the stator, and poles of the stator core supported on the inner periphery thereof. And a rotor provided with a field magnet facing the outer rotor.

The outer rotor type magnet rotating machine according to the present invention is characterized in that the stator is incorporated in a state protruding outside the flywheel.

When the stator is protruded out of the flywheel in this way, the heat radiation of the stator can be performed better than in the conventional case.

Further, in the outer rotor type magnet rotating machine of the present invention, the field magnet is a rare earth magnet.

When the rare earth magnet is used as the field magnet as described above, the axial dimension can be reduced, so that the axial dimension of the flywheel can be shortened, and the stator can easily protrude outside the flywheel. Can be.

Further, the outer rotor type magnet rotating machine of the present invention is characterized in that an air vent is provided on the bottom side of the flywheel.

[0017] The ventilation holes allow air to flow along the stator, so that the stator can be cooled even better.

[0018]

FIG. 1 shows a first embodiment of an outer rotor type magnet rotating machine according to the present invention. Parts corresponding to those in FIG. 5 described above are denoted by the same reference numerals.

In the outer rotor type magnet rotating machine of this embodiment,
The field magnet supported on the inner periphery of the flywheel 4 is a rare earth magnet 5B. Since the rare earth magnet 5B has a high magnetic flux density, the axial dimension can be reduced in order to obtain the same magnetic flux density as the ferrite magnet 5A. Therefore, the flywheel 4 is formed to have a short axial dimension, and the stator 3 It is protruding outside. Stator 3
Is formed in the same size as the conventional one.

Thus, the stator 3 is connected to the flywheel 4
, The protruding portion of the stator 3 comes into contact with the outside air, and the heat can be dissipated better than before. Further, it is possible to prevent the temperature of the rare earth magnet 5B from rising.

FIG. 2 shows a second embodiment of the outer rotor type magnet rotating machine according to the present invention.

In the outer rotor type magnet rotating machine of this embodiment,
The stator 3 protrudes from the flywheel 4, and the fan 1
The flywheel 4 is provided with a ventilation opening 10 at the bottom. Other configurations are the same as those of the first example.

The fan 13 and the ventilation port 10 allow the air to flow along the stator 3, so that the stator 3 can be cooled more satisfactorily.

FIG. 3 shows a second example of the embodiment of the outer rotor type magnet rotating machine according to the present invention.

In the outer rotor type magnet rotating machine of this embodiment,
Case 1 in which stator 3 and flywheel 4 are sealed
6, the stator 3 is configured to protrude from the flywheel 4, and the fan 13 is attached to the inner surface at the bottom of the flywheel 4,
A ventilation hole 17 is provided in the flywheel 4 and the case 16 adjacent to the fan 13, and a ventilation hole 18 is provided in the case 16 adjacent to the portion of the stator 3 protruding from the flywheel 4.

With such a configuration, by sending wind from the side to the stator 3, it is possible to prevent the stator 3 and the rare-earth magnet 5B from rising in temperature.

In the above example, an example in which a rare earth magnet is used as a field magnet has been described. However, the present invention can be similarly applied to an example in which a ferrite magnet is used as a field magnet.

[0028]

According to the outer rotor type magnet rotating machine of the present invention, since the stator is incorporated in a state of being protruded outside the flywheel, the heat radiation of the stator can be performed better than before.

Further, in the outer rotor type magnet rotating machine of the present invention, since the rare earth magnet is used as the field magnet, the axial dimension of the field magnet can be reduced, so that the axial dimension of the flywheel can be reduced. And the stator can be easily protruded out of the flywheel.

Further, in the outer rotor type magnet rotating machine of the present invention, the ventilation port is provided on the bottom side of the flywheel, so that the ventilation port allows the air to flow along the stator, thereby further improving the stator. Can be cooled.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first example of an embodiment of an outer rotor type magnet rotating machine according to the present invention.

FIG. 2 is a longitudinal sectional view showing a second example of the embodiment of the outer rotor type magnet rotating machine according to the present invention.

FIG. 3 is a longitudinal sectional view showing a third example of the embodiment of the outer rotor type magnet rotating machine according to the present invention.

FIG. 4 is a longitudinal sectional view showing an example of a conventional outer rotor type magnet rotating machine.

FIG. 5 is a longitudinal sectional view showing another example of a conventional outer rotor type magnet rotating machine.

FIGS. 6A and 6B are a longitudinal sectional view and a plan view showing another example of a conventional outer rotor type magnet rotating machine.

FIG. 7 is a longitudinal sectional view showing another example of a conventional outer rotor type magnet rotating machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator iron core a pole part 2 coil 3 stator 4 flywheel 5A ferrite magnet 5B rare earth magnet 6 rotor 7 boss 7a bolt 7b screw 8 rotation shaft 9 hole 10 ventilation port 11 fixing plate 12 ventilation port 13 fan 14 boss 15 bearing 16 case 17 , 18 ventilation holes

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaki Nakagawa 3744 Ooka, Numazu City, Shizuoka Prefecture F-term (reference) 5K609 BB03 BB18 BB20 PP02 PP06 PP09 QQ02 QQ12 QQ13 RR05 RR16 RR27 RR35 RR36 RR38 RR69 RR73 5H621 BB07 GA04 GB10 HH05 JK11 5H622 AA06 CA02 CA07 CA10 CB03 DD01 DD02 PP05

Claims (3)

[Claims] 1. A stator having coils wound around respective poles of a stator core, a flywheel surrounding an outer periphery of the stator, and a field magnet supported on an inner periphery thereof and facing the poles of the stator core. An outer rotor type magnet rotating machine comprising: a rotor having: a rotor provided with the stator, wherein the stator is incorporated in a state protruding outside the flywheel. 2. The outer rotor type magnet rotating machine according to claim 1, wherein said field magnet is a rare earth magnet. 3. The outer rotor type magnet rotating machine according to claim 1, wherein a ventilation port is provided on a bottom side of the flywheel.