JPH04109852A - Flat miniature fan motor - Google Patents

Abstract

PURPOSE:To obtain a flat miniature fan motor having high starting torque by disposing a fan in a square cut hole at the adjoining part of N and S poles of a magnet rotor in the side face of the motor. CONSTITUTION:An armature coil 4 secured on a (circular) soft steel board 6 is buried in a circular recess in casing 3a and fixed in place. A soft steel board rotor 7 is secured to a rotary shaft 1 and a magnet rotor is secured to the soft steel board rotor 7. A circular plastic magnet 5 is magnetized to produce N and S poles 5a, 5b, 5c, 5d having 90 deg. width. Adjoining poles have opposite polarities and a square air gap 21a is provided at the adjoining part of the poles 5a, 5b. When the soft steel board rotor 7 rotates together with the magnet rotor 5, air flows through air holes 6a, 6b,.... Consequently, an air flow is produced as shown by arrows A-1, A-2. Furthermore, dead point disappears because of the air gaps 21a, 21b and the output torque is flattened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] It is used to cool a part of an electronic circuit, such as an integrated circuit, which generates a particularly large amount of heat.

It is also used to blow air to a temperature sensor used to measure room temperature in automobile room air conditioners, general room air conditioners, and the like.

[Conventional technology]

There is no small and flat fan motor like the device of the present invention.

Even the smallest known fan motor has a diameter of about q millimeters and a thickness of about g millimeters, and it is impossible to make it even smaller and flatter due to its structure.

The charge of the present invention can have a diameter of about 1 mm and a thickness of about S mm.

[Problems to be Solved by the Invention] First Problem A conventional axial fan motor includes an L-phase semiconductor motor provided in the center, and a fan disposed around the outer periphery of the l-phase semiconductor motor.

Therefore, if you try to reduce the overall diameter, the diameter of the motor becomes small (and mass production becomes impossible, and the diameter of this type of motor currently used is 1 mm and the thickness is 1 mm).
There is a problem that the limit is about 1 meter, and it is difficult to make it smaller and flatter than this.

Second problem: The motor used is a phase motor in order to be small and inexpensive. Therefore, since there is a dead center and the motor does not start automatically, the cogging torque eliminates the need to stop at the dead center for self-starting.

Therefore, there is a problem that the starting torque becomes small.

[Means to solve problems]

In an axial gap type/phase DC motor in which a disc-shaped fixed armature and a magnetic rotor opposing it serve as field magnetic poles, four N and S magnetic poles with a width of 90 degrees are arranged in an annular shape. , different poles are arranged adjacent to each other, the opposing portions of the adjacent pair of N and S magnetic poles are each deleted by a predetermined width, and the opposing portions of the adjacent pair of N and S magnetic poles on the opposite side of the deleted portion are removed. A magnet rotor serving as a field magnetic pole is also removed with a predetermined width, a bearing fixed to the fixed armature side so as to rotatably support the rotating shaft of the magnet rotor, and a magnet rotor. A disc-shaped mild steel plate rotor that is attached to the magnetic pole surface of the child to close the magnetic path and whose center part is fixed to the rotating shaft;
In the two deleted portions of the magnet rotor described above, there is a hole provided in the mild steel plate rotor with the same shape as the deleted portion, and a hole extending outward with the seven radial sides of each hole as an axis. Two fans are installed at an angle and blow air in the direction of the rotation axis when the magnet rotor rotates, and a conductor part is effective for the output torque of the fan-shaped armature coil fixed to the fixed armature surface. The width of the conductor portions on both sides is made a predetermined width smaller than the magnetic pole width so that the magnetic field of the magnet rotor penetrates, and four fan-shaped fan-shaped pieces are arranged side by side along the circumferential surface at equal pitches. In the central part of each of the four fan-shaped armature coils, four air holes provided in the fixed armature are fixed to the fixed armature, and the outer peripheral part of the magnet rotor is fixed to the fixed armature. Every time the magnet rotor rotates 90 degrees, each time the magnet rotor rotates 90 degrees, the center of the conductor section on both sides of the fan-shaped armature coil is switched when the center part of the field magnetic pole coincides with the first . a position detection device that alternately outputs second position detection signals; The second position detection signal detects the positions of the odd-numbered armature coils and even-numbered armature coils of the armature coils arranged in parallel.In order to further increase the air volume, the outer peripheral surface of the above-mentioned mild steel plate rotor is , two arc-shaped air flow guy P side plates are installed on both sides of the two fans, and when the mild steel plate rotor rotates, the air flow converges and flows into each of the two fans. It is composed of:

[Effect]

There is no fan on the outside of the motor, and there is no fan on the side of the motor.
A fan is provided in a hole in a rectangular cutout adjacent to the N and S magnetic poles of the magnet rotor.

Since there are a number of such holes on the circumference, two fans can be provided in the holes.

Further, by eliminating the magnetic poles described above, a dead center is eliminated, so a large starting torque can be achieved.

In the center of each of the nine fan-shaped armature coils attached to the fixed armature, nine air holes are provided in the mild steel plate that serves as the magnetic path, allowing ventilation to be carried out by a fan. The air flow passes through the electric motor.

Therefore, it can be configured to be small and flat.

As understood from the above explanation, the first. This has the effect of solving the second problem.

According to the apparatus of the present invention, fan motors with a diameter of J mm and a thickness of 5 mm can be mass-produced.

Considering that the diameter of a 7 yen coin is J millimeter, the novelty of the above-mentioned compact and flattening technology should be understood.

〔Example〕

With reference to FIG. 1 and subsequent figures, details of the apparatus of the present invention will be explained with reference to embodiments.

Members with the same symbols in the drawings indicate the same members.

In FIG. 1, a hybrid circuit 3C including an IC chip is mounted on a substrate 3b inside the outer casing indicated by symbol 3. The housing 3 is small.

Symbol A is a fan motor according to the invention, with a diameter of J millimeters and a thickness of S millimeters.

The hybrid P circuit 3C is cooled by allowing air to flow in from the directions of arrows A-/A-2 through holes provided in the outer casing 3.

Although the air volume is small, it is an effective means for localized cooling.

If symbol 3c is a temperature sensor, arrow A-/.

Since the temperature of the air flowing in from the direction A-2 can be measured, this is an effective means for adjusting the indoor temperature when using a room air conditioner.

According to the conventional means, since the temperature sensor is located in the air intake hole of the room air conditioner, it is impossible to measure the average temperature in the room, and appropriate temperature control is impossible.

Since the device of the present invention is small and flat, it has the advantage of being able to measure room temperature at a few locations indoors.

This is an effective method in cases where the vehicle is in a small room such as a car.

Next, details of the fan motor according to the present invention will be explained with reference to FIG. 2(a).

In Fig. 2(a), 7 parts of the outer casing 3 in Fig. 1 are the outer casing 3.
It is shown as a.

An armature coil q fixed on a mild steel plate (circular) A is buried and fixed in the circular recess of the outer casing 3a.

These serve as fixed armatures.

The right end of a bearing /a made of oilless metal or Teflon material is fitted into the mild steel plate 6 and the hole in the center of the circular recess.

A rotary shaft l is rotatably supported in the hole of the bearing/a,
The center portion of the mild steel plate rotor 7 is fixed to the left end of the rotation axis l. Symbol 5 is a magnet rotor, and mild steel plate rotor 7
is fixed to.

Figure 2 (1)) shows the magnet rotor S in Figure 1 (a).
FIG.

In Figure 2(b), the circular plastic magnet S has 8 magnetic poles with a width of 90 degrees! ;a,! ;b,! ;c
, jd.

Adjacent magnetic poles are different poles, and a rectangular gap 2/a is provided in the adjacent portion of magnetic poles ja and jb.

Gap part ko/a and the void part ko/b on the opposite side separated by igo degrees
The gap portions 2/a and 2/b have the same shape, and the seven adjacent pairs of N and S magnetic poles have the same shape and have been removed.

The magnetic path of each magnetic pole is closed by a mild steel plate rotor 7, and their magnetic fields penetrate through the opposing armature coils, and the magnetic path is closed by a mild steel plate A.

Iron loss can be reduced by using a silicon steel plate instead of the mild steel plate O.

The mild steel plate rotor 7 has the above-mentioned voids 2/a, 2
A hole having the same shape as 1b is provided by press working.

During this processing, the central rectangular portion of the hole/ga.

/, ft) are left behind and processed.

Symbols /ga and /gb are parts that become fans.

The former is bent at the /9a part on the left side, with the bent part protruding towards the back side of the paper, and the latter is bent at the /9b part on the right side, with the folded part protruding towards the back side of the paper. It has been done (Sru.

When the mild steel plate rotor 7 rotates in the direction of arrow G-/, an air flow is generated by the fans /gts and /gb, as shown in Fig. 2(a).
Air is blown in the direction of arrow D-/, D-, 2. The hybrid circuit 3C shown in FIG. 1 is cooled by this air blowing.

When the mild steel plate rotor 7 is rotated in the direction of arrow G-2, the direction of air blowing is reversed and the air inside the outer casing 3 shown in Fig. 1 is sent out to the outside, so that air is exchanged and a cooling effect is achieved. .

In both cases, holes for air to enter and exit are required in 7 parts of the outer casing 3.

FIG. 2(C) is a plan view of the fixed armature DA, as viewed from the direction of arrow B in FIG. 2(a).

In FIG. 2(c), armature coils lIa, ub, tIc, and dad wound in a fan shape are arranged and fixed at equal pitches along the circumferential surface on the mild steel plate O.

Each armature coil has the same shape, and the conductor part (
The distance between the two radial sides (both sides in the radial direction) is smaller than 90 degrees (the width is a predetermined angle).

An IC-based energization control circuit including a Hall element (which will become a magnetoelectric conversion element) described later is mounted on the protrusion 6a of the mild steel plate B.

Printed wiring (not shown) is provided on the upper surface of the mild steel plate O, and the necessary wiring is made between the terminals of the energization control circuit and each armature coil.

The above-mentioned IC chip/l can also be fixed to the outer casing 3a, as shown by the same symbol in FIG. 2(a).

Mild steel plate B has fan-shaped holes Aa, Ab, and bc.

+a (dot part) is provided by press working.

When the mild steel plate rotor 7 of FIG. 2(a) rotates together with the magnet rotor S, airflow can pass through the holes 4a, Ab, . . . .

Also, holes of the same shape are provided in the outer casing 3a in the portions of the holes 4a, Ab, . . . , but they are not shown here.

Therefore, an air flow is generated as shown by arrows A-/ and A-2 in FIG. 2(a), and external air can flow into the outer casing 3.

What is indicated by the dotted line 7a in FIG. 2(a) is a cover made of plastic or mild steel plate.

By fixing the right side opening of the cover 7a to the outer periphery of the mild steel plate O, and providing a hole in the side surface of the cover 7a,
Air flows in the directions of arrows D-/ and D-2 can be obtained.

With the above configuration, it can be used as one independent fan motor.

In Fig. 2(b), the dotted line symbols /g-/ and /g-2 are the airflow guide side plates.◇The guide side plates /g-/ and 1g-2 are along the dotted line positions , is an arc-shaped side plate erected on the rotating surface of the mild steel plate rotor 70, and the erected height is about S mm.

When the mild steel plate rotor 7 rotates in the direction of arrow G-2, the airflow is focused toward the center, and the focused airflow is directed toward the fan/
It has the effect of increasing the force of air hitting the ga.

Since the airflow guide side plate indicated by the dotted line /g-2 has the same configuration, the airflow is converged and the blowing force of the fan /gb is increased.

When the mild steel plate rotor 7 rotates in the opposite direction (arrow G-/direction), the same objective can be achieved by making the inclinations of the guide side plates 7g-/ and 1g-co in the opposite direction with respect to the circumferential surface. Ru.

FIG. 3 shows the magnet rotor 5 and armature coil 4 (a,
4(b, . . . ).

Hall element //a is N outside the magnet rotor S,
Opposed to the S magnetic pole (each magnetic pole width is 90 degrees), a position detection signal is output every time the magnet rotor rotates 90 degrees in the direction of arrow G. Magnetization is performed separately from magnetization of the magnetic poles.

The width on both sides of the ti coils 4a, 'i4b,... is 90 mm.
It is smaller than the degree.

The armature coils ua and lIc are connected in series (or in parallel) and are energized by a positive terminal qa and a negative terminal b of the DC power supply.

Armature coil da b and da d are also connected in the same way, and the re-pole terminal 9
It is energized by a and the negative terminal 9C.

Next, the energization control means for each armature coil will be explained with reference to FIG. In FIG. 9, armature coils M and N are armature coil 9a, daC, and armature coil llb, respectively.
41c shows the above-mentioned series connection.

Symbol F indicates an electric circuit that amplifies the output of the Hall element //a. This and transistor /Aa, /Otsu, diode/? The integrated circuit including a and /7b is indicated by the symbol // mentioned above.

When facing the Hall element //alJ''-8 magnetic pole, the transistor /Aa is energized and conductive by its position detection signal output, so that the armature coil M connects to the DC power supply positive and negative terminals ga.
, gb.

When Hall element //a faces the N pole, transistor /4b is energized and conductive by its position detection signal output, and therefore armature coil N is energized.

When armature coils M and N are de-energized, the stored magnetic energy is discharged via diodes /7a and /7b, respectively.

Returning to FIG. 3, the output torque generated by the above-mentioned energization will be explained.

The curves /2rs, /3a, /2b, . . . are output torque curves.

Curves /yua and /2b are torque curves corresponding to each rotational angular position when the magnet rotor S rotates 360 degrees in the direction of arrow G from the illustrated position.
lb, conductor part on the right side of da d) -/.

This is a torque curve due to energization of the dad-/.

Curves /3a and /3b are the same (armature coil < zb.

This is a torque curve due to energization of the conductor portion db-: L and IIa- on the left side of d.

The Hall element //a enters the N magnetic pole outside the magnet rotor, rotates 90 degrees, and obtains a position detection signal with a width of 90 degrees, and the armature coils sb and lIa are activated by a width of 7θ degrees. After being energized, there is no position detection signal output in the next rotation of 0 degrees, and a position detection signal with a width of qov is obtained in the next rotation of qO[.
The current is energized for a width of .

Therefore, the output torques of curves 12h and /3a and curves 11b and 13b are obtained.

When the magnet rotor S rotates 90 degrees from the illustrated position, the Hall element //a faces the S magnetic pole, so a position detection output is obtained and the armature coil qa.

Da C is energized for a width of 90 degrees, de-energized for the next 90 degrees of rotation, and energized for the next 90 degrees with a position sensing output.

The output torque due to energization of the right conductor portion of the armature coils 4a, 'i(c) is curve 15a, and the output torque due to energization of the left conductor portion is curve 15a.

/&b.

The resultant torque of all the torque curves described above becomes almost flat, and the dead center has the effect of being eliminated.

Dotted lines 10eh, 10b, /QC indicate armature coil M,
It shows the position where the energization of H is switched.

The shape of the gap and the armature coils 4Za and 4'b shown by symbols -/a and 2/b of the magnet rotor 5 in FIG.

Torque curve /coa, /cob depending on the width between both sides of...

/,? The characteristics of a, /Jb, . . . also change. For example, changing the lengths of arrows E and E will change the torque characteristics, so it is better to adjust these to make the composite torque curve as flat as possible.

As shown in the figure, when each armature coil is at the center of the magnetic pole width of 20 degrees, the Hall element //a has N, S magnetic poles 5a,
N and S of the outer magnetic poles magnetized in the same phase as 5b,...
It faces the polar boundary.

As explained above, since the magnet rotor 5 rotates synchronously with the mild steel plate rotor 7, a small and flat fan motor can be constructed.

Due to the existence of the gaps 2/a and 2/b, the dead center disappears and the output torque becomes flat, and the fan motor is constructed by providing a fan using the gaps J/a and 2/b. It has the following.

The novel technology of the device of the present invention is that a small and flat fan motor is constructed by taking advantage of the drawback that a single-phase semiconductor motor is difficult to start automatically.

〔effect〕

This has the effect of providing a flat fan motor with a small diameter, which is impossible with conventional technical ideas.

Therefore, it is possible to provide an effective means for locally cooling parts of a hybrid r circuit including a part C that generates a large amount of heat.

Furthermore, a temperature sensor is required in the case of a room air conditioner that automatically maintains the space where people live in a car or house at an appropriate temperature.

Although the temperature sensor is located in the air intake section of the air conditioner, this means does not serve as a sensor for the average indoor temperature, making it difficult to maintain an appropriate temperature.

In such cases, it is necessary to provide temperature sensors at several locations in the space where humans live and to send airflow to these sensors. Such a blowing means needs to be small-sized, and the apparatus of the present invention has the effect of providing an optimal means.

[Brief explanation of drawings]

Fig. 1 is a side view of the outer casing housing the noisolid circuit in which the device of the present invention is used, Fig. 2 (a) is a sectional view of the device of the present invention, and Fig. 2 (1)), (C) is a plan view of the magnet rotor and fixed armature, Figure 3 is a developed view of the magnet rotor and armature coil, and a graph of the torque curve, and Figure 3 is a diagram of the energization control circuit of the armature coil. Each is shown below. /, /a...rotating shaft and bearing, 3...outer casing, A
...Fan motor, da, 4ja,! b, ... armature and armature coil, ! ;、! ;a,! ;b,...Magnetic rotor and magnetic poles, 6,7...Mild steel plate and rotor, 7a...Plastic cut-//, //a...
・No. of energization control circuit and Hall element, co/a, 21b
...Gap, /ga, /g'F:r...Fan,
ig-/, 1g-2... Air flow guide side plate, 3b
...Substrate, 3C...-21 Hybrid E C, A
a, lsb, Ac, &d-vacancy, ga, jlb, ? a,
qb, 9c...DC power supply voltage negative pole, /2a, /2b
, /3a, /,? b, /Hiroa, /4Zb, /! ;
a, 151)...torque curve, M, N...armature coil, F...Hall element//a amplifier circuit, /
Aa, /6b...Transistor. Mei l Figure 2 Figure Cα) Rei Figure 2 (6) Leather Figure rc>

Claims (2)

[Claims] (1) In an axial gap type one-phase DC motor in which a disk-shaped fixed armature and a magnet rotor facing the armature serve as field magnetic poles, four N and S magnetic poles with a width of 90 degrees are arranged. Different poles are arranged adjacently in an annular shape, and a set of adjacent N
, the opposing portions of the S magnetic poles are each deleted by a predetermined width, and the opposing portions of a pair of adjacent N and S magnetic poles on the opposite side to the deleted portions are also deleted by a predetermined width, respectively, so that the magnet becomes a field magnetic pole. a rotor; a bearing fixed to a fixed armature side so as to rotatably support a rotating shaft of the magnetic rotor;
In the disc-shaped mild steel plate rotor that is attached to the magnetic pole face of the magnet rotor to close the magnetic path and whose center part is fixed to the rotating shaft, and in the two deleted parts of the magnet rotor described above, the deletion is performed. 2 installed on the mild steel plate rotor with the same shape as the part.
and two fans that are provided to be inclined outward with one radial side of each hole as an axis and blow air in the direction of the rotation axis when the magnet rotor rotates;
The conductor portion of the fan-shaped armature coil fixed to the stationary armature surface is designed so that the magnetic field of the magnet rotor penetrates through the conductor portion effective for output torque, and the width of the conductor portion on both sides is a predetermined width smaller than the magnetic pole width. Four fan-shaped armature coils are arranged side by side along the circumferential surface at equal pitches, and a fixed armature is provided at the center of each of the four fan-shaped armature coils. fixed to four holes and a fixed armature,
Each time the magnet rotor rotates 90 degrees, the output of one position sensing element facing the 90 degree wide N and S magnetic poles on the outer periphery of the magnet rotor detects the When the center of the conductor portion coincides with the center of the field magnetic pole, it is switched, and the first and second position detection signals of rectangular waves having widths corresponding to the N and S magnetic poles of the field magnetic pole are generated. Odd-numbered armature coils and even-numbered armature coils of the juxtaposed armature coils are energized by the width of the position detection signal by the position detection device and the first and second position detection signals that are alternately output. A small flat fan motor characterized by being configured with an energization control circuit. (2) In the scope of the claim set forth in paragraph (1), on the outer peripheral surface of the mild steel plate rotor, an air flow is provided on both sides of the two fans, and when the mild steel plate rotor rotates, A small flat fan motor characterized by comprising two arc-shaped airflow guide side plates that converge and flow air into two fans.