JPS62189398A - Flat motor fan - Google Patents

Abstract

PURPOSE:To contrive to increase the flux density of a coil by so providing a fan boss part made of soft magnetic material constituting a fan as to be adjacent at the opposite side face of a coil magnet to make this fan boss part function as magnetic yoke. CONSTITUTION:A fan boss part 32 made of soft magnetic material constituting a fan 30 is so provided as to be adjacent at the opposite side of the magnet of a coil 16. As for this flat fan, a coil 1B, which is provided as to have small clearance to the magnet of the stator 10 side on the rotor 20 side, and a commutator 15 and a fan boss part 32, which is made of soft magnetic material constituting the fan 30 and so provided as to be adjacent to the opposite side face of the magnet 3 of the coil 16, function as magnetic yokes. As the result of this, the flux density of the coil 16 constituting the rotor 20 can be increased without increasing the number of parts. And the thickness of the flat fan can be made thinner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a thin motor fan, and particularly to motor fans used in radiators of automatic IT, condenser refrigerants, etc. The present invention relates to a flat motor fan suitable for.

[Prior Art] Examples of conventional flat motors used in this type of flat motor fan include those shown in Japanese Patent Laid-Open No. 58-190264 and Japanese Patent Laid-Open No. 57-170686.

That is, as a method of increasing the magnetic flux density of the rotor winding of a flat motor disclosed in the above-mentioned conventional example, JP-A No. 58-190264, the method of increasing the magnetic flux density of the rotor winding of the flat motor is to connect the rotor with ""! It is conceivable to install the 1st issue -j-ri.

Technique 1 shown in JP-A No. 1057-170686 (
1 is an example of this, and the above technology includes a magnet disposed on the V1 plate and a rotor disposed with a gap therebetween in a cover made of a thin iron plate, and also has a brush. A brush 1- that causes the output l11h to be rotated φl through the rotor by energizing =1 ile of the rotor.
In 1-Event, the above-mentioned [1-Event] is constructed by fixing a soft magnetic material to one side of the warped magnet.

[Problem L', t to be solved by the invention] However, when the magnetic yoke is inserted into [1-9], the flat motor itself becomes thicker, and there is a problem that the thickness of the flat motor fan cannot be made thinner. -)lko.

Therefore, in order to solve the above-mentioned problems, the present invention aims to provide a flat motor fan in which the magnetic flux density of the coil is reduced to reduce the thickness of the motor.

[Means for Solving Problem J] The flat motor fan according to the present invention includes a stator consisting of a magnet, a brush holder, and a brush disposed on the cover side, and a coil disposed with a slight gap between the magnet and the stator. A rotor consisting of a rotor and a fan boss formed of a soft material forming a fan is provided adjacent to the opposite side of the 17 magnet of the coil of the rotor. be.

[Function] In the present invention, the coil and soft magnet are arranged with a slight gap between them and the magnet arranged on the cover side. The rotor consists of a fan boss made of soft magnetic material, and the magnetic flux density of the coil can be increased by the soft magnetic material of the fan boss.

[Embodiment] FIG. 1 is a sectional view of a motor according to an embodiment of the present invention.

In the figure, the cover 1 is formed of a thin iron plate or the like,
A shaft 2 is firmly attached to the center of the shaft 1 by a lower fixation such as welding. Further, a magnet 3 is arranged concentrically with the shaft 2. At the tip of the shaft 2, there is a ball bearing 11 which is caulked by the shaft 2, and a mounting block 12 which is fixed by press fitting or the like.
A rotor base body 17 is disposed via the rotor base body 17. and,
Four rotor mutators 15 are attached to the rotor base 17. A sliding member 14 such as a metal bearing is press-fitted inside the commutator 15. The sliding member 14 allows the rotor base 17, which is supported in a cantilever manner by the ball bearing 11, to rotate around the shaft 2 in a stable state by sliding. Therefore, the fourteenth sliding portion can prevent the load on the rotor base 17 and the unbalanced wobbling on the rotor side.

, : Il! arranged around the outer periphery of the 1 mm inverter 15. The IFi flow is supplied to the fluid piece 13 by the brush 5 pressed by the spring 6 held in the brush holder 4. The brush holder 4 that holds the brush 5 and the spring 6)
It is arranged on the J bar 1 side. The brush 5 is supplied with electric power by a lead wire 8 that passes through a rubber bush 7 of the cover 1.

A coil 16 is molded on the rotor base 17,
The coil 16, ie, the rotor 20 side 17, and the magnet 3 are disposed facing each other with a small gap. On the opposite side of the coil 16 from the magnet 3, a fan boss section 32 formed of a soft magnetic material integrally molded with a synthetic resin vane section 31 is attached to the mounting block 1 by means of a mounting screw 18.
2 ni tori (J GJ has been removed.

If you are concerned about eddy current loss occurring in the magnetic yoke, as shown in the sectional view of a flat motor according to another embodiment of the present invention in FIG. It can be called a magnetic material.

The end of the cover 1 has a first bent part 18 and a second bent part 1b, and the first bent part 18 is convex toward the 1-ta 20 side, and the second bent part 1b is It is concave on the rotor 20 side.

The first bent portion 1a and the second new bent portion 1b are formed by the blade portion 31.
The distance between the inner circumferential wall 31a and the convex ring portion 31 is reduced.
L) and the second bent portion 1b are fitted together such that the tip of the cover 1 is positioned within the concave ring portion 31c. That is, the roughness of the cut-off concavo-convex portion of the end of the cover 1 and the roughly concave-convex portion of the fan 30 are fitted into each other, and the sealing structure jz5 is achieved by reducing the gap between the phases n, and the above-mentioned Despite the gap between them, the substantially uneven cross-section of the end of the cover 1 and the substantially uneven cross-section of the fan 30 fit together to prevent water droplets and dust from entering the inside.

Note that the magnet 3, brush holder 4, and brush 5 arranged on the cover 1 side constitute a stator 10. The rotor base 17 supported by the rotor mutator 15, the commutator 13, the sliding member 14, and the ball bearing 11 in a cantilevered manner constitutes a rotor 20. Further, the blade portion 31 and the fan boss portion 32 integrally formed with the blade portion 31 are connected to the fan 3.
Configure 0.

In the flat motor fan configured as described above, the magnetic flux of the magnet 3 is transferred to the coil 16 in the rotor base 17.
It passes through a closed magnetic path with relatively low resistance via the fan boss part 32 made of soft magnetic material, which is provided in close contact with the rotary part 17. Therefore, the magnetic flux 1ffH of the coil 16 can be made higher.

In this state, it is supplied from the lead wire 8! The electric power iJ is supplied via the brushes 5 and the commutator plates 13 to a coil 16 molded into the rotor 4 part 17 .

Therefore, the rotor 20 will rotate due to the action of the magnetic field of the magnet 3. The rotation of the rotor 20 becomes the rotation of the fan 30 by the fan boss portion 32. During this period, water droplets and ItJ1 dust do not enter the inside of the fan 30 due to the fitting between the substantially uneven cross section of the end of the cover 1 and the substantially uneven cross section of the fan 30 in the rotating state and in the stopped state.

In this way, the flat motor fan of the above embodiment does not rotate as a body between the rotor 20 and the shaft 2, but directly transmits rotation from the rotor 20 to the fan 30. By arranging one ball bearing 11 on the fan 30 side of the rotor 20, the movement between the shirt 1 and the shirt 1-2 can be regulated, and the movement between the rotor 20 and the fan 30 can be balanced. A sliding member 14 is disposed at the end opposite to the rotor 20, and the imbalance between the rotor 20 and the shaft 2 is corrected by the sliding member 14 and the shaft 2.
It absorbs water by sliding on it.

The sliding member 14 formed of the metal bearing or the like is
Since the imbalance between the rotor 20 and the shaft 2 should be absorbed by the sliding movement, the length of the sliding member 14 is l''-
The thinner the layer is, the more right-handed it is, and its length can be set arbitrarily.

Therefore, the thickness of the flat motor itself can be made as thin as possible without one bearing.

Further, in the above embodiment, rotation is directly transmitted from the rotor 20 to the fan 30, which is a load, and the substantially uneven cross section of the cover 1 and the substantially uneven cross section of the fan 30 are formed so as to fit into each other. ζ, the cover on the fan 30 side of the flat motor can be omitted, and furthermore, the thickness of the flat motor can be made thinner.

In the above embodiment, the fan boss portion 32 is made of a soft magnetic material, so the magnetic flux density of the coil 6 can be made higher.

Furthermore, heat generation due to eddy current loss does not normally pose a problem because the fan is in the atmosphere and directly cools the fan boss portion 32. If the rotational speed is very high and eddy current loss becomes a problem, the fan boss portion 22 may be constructed of a plurality of thin members made of soft magnetic material. Changes in magnetic flux accompanying the rotation of the rotor 10 generate eddy currents in the disk-shaped fan boss portion 32 made of a plurality of thin soft magnetic materials. However, since the soft magnetic material is formed into a thin plate shape compared to the soft magnetic material with which the fan boss part 32 is integrated, eddy current is less likely to occur due to the resistance between the plates, resulting in eddy current. Current loss is reduced. By applying an insulating coating between the plurality of thin disks made of soft magnetic material, the generation of eddy current can be further suppressed.

In the above embodiment, the fan 30 is composed of the blade portion 31 and the fan boss 532, but the blade portion 3
It is also possible to use a soft magnetic fan 30 in which the rotor 20 is made up of the silent body 17. In addition, the mounting block 12 is used for mounting I-J of the ball bearing 11.
and fan boss part 32 (j + screw 18 is provided in 1.1 above to make the screw thread firm), but when carrying out the present invention, direct Jg r-]- 20 may be fixed to the rotor base 17 by means of screw fastening means.

Further, in the above embodiment, the convex ring portion 31 of the blade portion 31
b and the second curved part 1b of the cover 1 are fitted together, and the distal end of the cover 1 is positioned within the four-striped ring part 31C to obtain a sealing effect. However, in carrying out the present invention In this case, the fitted state of the substantially uneven cross-sectional portion is not limited to the saw bar 1 and the blade portion 331;
The substantially uneven cross section can be referred to as the substantially uneven cross section of the fan boss portion 32. Also, it is sufficient to install an uneven fitting portion between the cover 1 and the fan 30 to improve the sealing effect.

In the above embodiment, the end portion of the cover 1 has the first bent portion 1a and the second bent portion 1b, into which the convex ring portion 31b of the blade portion 31, the dog 121, and the bent portion 1b are fitted. The cover 1 is fitted in such a way that the tip of the cover 1 is located within the concave ring portion 31c to achieve a sealing effect. The substantially uneven portions 1, = lj may be formed in four parts, and the other part may be formed as a convex part, or a substantially uneven section may be formed on one side and a substantially uneven part on the other side, and they may be fitted together. .

Furthermore, if the substantially uneven cross section of the cover 1 and the fan 30 has a structure that expands outward, i.e., if the diameter of the outer substantially uneven cross section to which the cover 1 and the fan 30 are fitted is approximately the same, the natural fall in the stopped state will occur. The centrifugal force of the rotating state determines the ability to remove water droplets and dust.

[Efficacy of invention! $! 1 As described above, the flat motor unit of the present invention has a coil, commu- lar arc, and soft magnet arranged on the rotor side with a gap between the stator side magnet t' and the magnet t' on the stator side.
Since the fan boss section made of bamboo material acts as a Vti bamboo material, it is possible to largely cover the magnetic flux Ifi of the coil constituting the rotor without increasing the number of parts.

Furthermore, the thickness of the flat motor fan can be reduced.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a flan 1-motor fan according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a flat motor fan according to another embodiment of the present invention. In the figure, 1...cover, 1a...first bent part,
1b...Second bending part, 3...Magnet,
4... Norashi protector, 5... Brush,
10... Stator, 13... Commutator piece,
14...Sliding member, 15...Conmi'take, 16...Coil, -17...Shi1-ta-bar body,
20...Rotor, 30...Fan, 3
1b...Convex ring part, 31c...Concave ring part. In addition, in the figures, the same reference numerals and the same symbols indicate the same or equivalent parts.

Claims (2)

[Claims] (1) A stator consisting of a magnet, a brush holder and brushes arranged on the cover side, a rotor consisting of a coil and a commutator arranged with a small gap from the magnets, and a fan boss section made of soft magnetic material. What is claimed is: 1. A flat motor fan comprising a fan comprising: a fan boss portion formed of a soft magnetic material constituting the fan; and a fan boss portion formed of a soft magnetic material constituting the fan is provided adjacent to the opposite side of the magnet of the coil. (2) The flat motor fan according to claim 1, wherein the soft magnetic material of the fan boss portion is a plurality of disc-shaped soft magnetic thin plates.