JPS6031409Y2 - fan electric motor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fan motor (fan electric motor) for blowing air.

It is well known that fan motors driven by semiconductor motors that use DC as a power source have long service life and low noise generation, but they have a more complex structure than commutator type ones, and The drawback is that it is inevitably expensive.

The present invention was proposed in order to eliminate the above-mentioned drawbacks. It uses an axial gap type semiconductor motor, which simplifies the configuration. Also, since the rotor and stator of the motor are exposed, the cooling effect is improved. is large, which makes it suitable for use as a fan motor for automobiles.

In particular, the mild steel plate that constitutes the magnetic path of the magnet, which is the rotor, is characterized in that it also serves as a member for fixing the blower fan, cooling fan, and field magnet to the rotating shaft.

Furthermore, this type of electric motor has a strong thrust in the axial direction, which is a drawback that reduces service life and efficiency, but the present invention is characterized by eliminating this drawback by using magnets. It has the following.

The details of the device according to the invention having the above-mentioned features will now be explained by way of example.

In FIG. 1, symbol 1 is a main body, on which a shallow cup-shaped stator 5 is fixed with screws.

The stator 5 is made of plastic molding, and inside it,
During injection molding, it is filled with mild steel powder or silicon steel powder.

The ratio is more than 50% by volume.

In addition, the powder particles are electrically insulated to prevent eddy current loss.

As a concrete means, the following may be used.

That is, as shown in FIG. 4, mild steel particles 9a, 9b,...
It is best to coat the surrounding area with a plastic with a high melting point beforehand, and then mix it with the injection molding material and mold it.

Alternatively, a distantly related purpose can be achieved by using mild steel particles as the particles 9a and 9b, coating the surface with magnetic iron oxide (4-3 iron oxide), and then mixing with injection molding material and molding. It is something that can be done.

The stator 5 can also be made by spirally winding a narrow silicon steel plate, solidifying it into a disc shape, and molding the disc into a plastic cup shape with this as the bottom surface.

An armature coil 7 is fixed on the bottom surface of the stator 5 to constitute a fixed armature.

A bearing cylinder 8 is installed in the center of the stator 5, and the rotary shaft 2 is rotatably supported in this cylinder.

Fans 3a and 3b, which are made by pressing a mild steel plate, are fixed to the rotating shaft 2 by press-fitting through attachment portions 3C.

Since the fans 3a and 3b blow air in the direction of arrow A, they have the effect of serving as cooling fans for cooling the exposed armature coil 7.

The central part 3 of the fans 3a and 3b made of mild steel has a magnet 4.
This is the magnetic path of the

As shown in FIG. 3a, the magnet 4 is fixed to the mild steel plate 3 with an opening angle of 90 degrees and magnetized to N and S poles.

The magnet 4 constitutes a magnetic field, and a magnetic path of the magnetic field of the magnet 4 is closed by the stator 5 and the mild steel plate 3.

An armature coil 7 is placed within the magnetic field.

The mild steel plate 3 is characterized by serving as a part for the fan, a magnetic path, and a mounting part for the magnet 4.

Next, FIG. 2 shows details of the stator 5.

Symbols 5a*, 5b, and 5c are screw holes for attachment.

Components with the same symbols as in FIG. 1 are the same members.

As described above, the stator 5 has a cup-shaped shape, and on its bottom surface, three fan-shaped stators, each of which has an effective conductor opening angle of 90 degrees, are fixed at an angle of 120 degrees.

The means for driving this armature coil is the means shown in Japanese Patent Publication No. 38014/1973, or the well-known driving means for the turntable of a record player.

Since both are semiconductor motors, position detection means are required, but in general, armature coils 7a, 7b,
It is fixedly provided in the adjacent part of 7c.

The number of armature coils may be six.

The above-mentioned winding is a modified version of the lap-wound winding, and since the armature coils do not overlap, it is suitable for mass production and is characterized by good efficiency.

Returning to FIG. 1, the stronger the magnetic field passing through the armature coil 7, the better, but this also increases the force that attracts the magnet 4 to the left.

Therefore, the thrust force that presses the rotating shaft 2 against the main body 1 increases,
It has the disadvantage of increasing friction loss and wear, making it impractical.

In order to eliminate this drawback, a disk-shaped magnet 6 is used.

A ferrite magnet is used as the magnet 6, and the third
As shown in the figure, N and S poles are provided in the axial direction.

It is also fixed to the rotating shaft 2.

Therefore, the magnet 6 is attracted to the stator 5, and the rotating shaft 2
will be pushed to the right.

Since this force is in the opposite direction to the force due to the magnetic field described above, the force with which the rotating shaft 2 presses the main body 1 is reduced.

For example, if the force to the left due to the magnetic field is 2kp,
If the force to the right by the magnet 6 is set to 1.6 ka, the thrust becomes 0.4 kg, which has the effect of greatly reducing wear and torque loss.

The above-mentioned rightward force can be freely increased or decreased by adjusting the gap between the magnet 6 and the stator 5, so that an effective technical means can be provided.

Since the configuration is as shown in Figure 1, the overall configuration is simplified,
This has the effect of providing a fan motor that is mass-producible, inexpensive, and practical.

Also, since the armature coil 7 is exposed in the air passage,
It is characterized by a good cooling effect.

During operation, if iron powder or the like in the atmosphere accumulates on the surface of the magnet 4 that serves as a field, it may come into sliding contact with the surface of the armature coil 7 and cause trouble.

In order to prevent this, as shown in FIG. 2, a protruding portion 5d is provided during molding of the stator 5, and this protruding end is connected to the armature coil. If the height is higher than the planes a, 7b, and 7c, the above-mentioned deposits can be scraped off by the projecting end of the projecting portion 5d, without touching the armature coil, and thus the above-mentioned trouble can be removed.

As explained above, according to the device of the present invention, the purpose stated at the beginning is distantly related, and the practical effects are remarkable.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the device of the present invention, Figure 2 is an explanatory diagram of the stator, Figure 3 is an explanatory diagram of the magnet fixed to the rotating shaft, and Figure 4 is an explanatory diagram of the magnet fixed to the rotating shaft.
The figures each show an explanatory diagram of the material of the stator. 1... Main body, 2... Rotating shaft, 3.3a
, 3b...Fan, 4...Field magnet, 6...Magnet, 5...Stator, 7. 7a* 7bt 7c... Armature coil, 8... Bearing, 9a, 9b...
- Mild steel powder, 10a, 10b...Insulator.

Claims (5)

[Scope of utility model registration request] (1) A disc-shaped magnetic stator that constitutes a magnetic path, a bearing provided in the center of the stator, a rotating shaft rotatably supported by the bearing, and the rotating shaft described above. A fan whose center part is fixed to the right end and made of a mild steel plate, an annular field magnet fixed to the left side of the fan, and a group of magnetic poles in which N and S poles are arranged alternately in the axial direction of the magnet. and,
An armature coil group fixed on the right side surface of the stator and an armature coil group fixed on the right side of the stator so that the magnetic field formed through the stator provided opposite to the magnetic pole group penetrates. It consists of a disc-shaped magnet that is fixed to the rotating shaft with a small gap on the left side and magnetized to N and S poles in the axial direction, and a thrust wind installed at the left end of the rotating shaft. A fan electric motor characterized by: (2) In the scope of the utility model registration claim set forth in paragraph (1), the fan is characterized in that a stator is provided with a spirally wound disk-shaped silicon steel plate as a magnetic path for the field magnetic field. Electric motor. (3) In the scope of the utility model registration claim set forth in paragraph (1), a fan motor characterized in that it is provided with a stator constituted by an injection molded body filled with mutually electrically insulated magnetic powder. . (4) A fan electric motor according to the utility model claim set forth in item (1), characterized in that it is provided with a stator made of an injection molded body filled with mild steel powder coated with magnetic iron oxide. (5) In the utility model registration claim set forth in paragraph (1), a radially elongated protrusion is provided on the surface of the stator, and the protrusion scrapes magnetic powder deposited on the surface of the magnet. A fan motor characterized by being equipped with a dropping device.