JPH0370447A - Single-phase brushless vibrating motor - Google Patents

Abstract

PURPOSE:To simplify a structure by constituting an apparatus in such manner that a current always flows in the same direction through a conductor part contributing to one side generated torque of one armature coil and through that contributing to the other side generated torque of the other armature coil arranged adjacently to each other of a fixed side coreless armature. CONSTITUTION:Two or more coreless armature coils 24-1, 24-2 are single phase- arranged on the fixed side to constitute a fixed side coreless armature 25. A conductor part 24-1a contributing to one side generated torque of one armature coil 24-1 and a conductor part 24-2b contributing to the other side generated torque of the other armature coil 24-2 are electrically connected so that a current flows always in the same direction. Also, a single magnetic pole type field magnet 23 formed by the magnetization of any one single magnetic pole of N and S poles so as to form no annular shape is equipped as an eccentric rotor facing the fixed side coreless armature 25 via an axial air-gap. Thus, one drive circuit is sufficient for one position sensing element so that a very low-priced circuit constitution and also a simple structure is made possible.

Description

[Detailed Description of the Invention] [Industrial Application Field of the Invention] The present invention is a signal receiver for blind people, which has the purpose of transmitting a predetermined signal, and can apply a light vibrator to the human body, etc., and has a pine surge effect or a light It is built into a pine surge device that requires vibration, or a pager (hereinafter referred to as a pager), and when driven, it gives vibration to the pager, etc., and when the vibration is applied to the human body, the pager etc. is activated. Regarding an axial gap type single-phase brushless vibration motor that can generate vibration, such as a device that can be used for the purpose of notifying people of the current situation.

This is a single-phase brushless vibration motor that has a long life because it is brushless, has an extremely simple structure, and is ultra-thin, compact, and low-cost.

[Prior art and its problems] Various devices are known for the purpose of transmitting vibrations to the human body, such as pine surge machines and signal receivers for blind people.

Although the single-phase brushless vibration motor of the present invention is useful for use in the above-mentioned devices, for example, the conventional pager has the following drawbacks.

In today's information society, pagers are frequently used by businessmen, and the number of pagers sold is increasing.

Here, pagers emit loud noises no matter where they are, and the noise disturbs people around them, or even has a negative impact on the mental health of the person who owns the pager. .

Under these current circumstances, nowadays, instead of making a sound, the pager is made to vibrate.

Attempts have been made to be able to communicate telephone calls.

There are various ways to make a pager vibrate, but in order to make a small pager vibrate,
Small, inexpensive DC motors are seen as promising. In particular, DC motors are inexpensive, compact, yet highly efficient, and suitable for high-speed rotation.

Here, as the conventional DC motor used in the pager 5 etc., an axial gap type motor 1 is used.
For example, as shown in FIGS. 4 and 5, a rotating plate 3 is attached to the rotating shaft 2 of a flat axial gap type vibration motor 4 to form an axial gap type vibration motor 4.

In this way, a rotating plate 3 is attached to the rotating shaft 2 of the axial gap type motor 1.
A vibrating axial gap type motor 4 configured by attaching it is built into the pager 5, and when this is driven, the pager 5 will vibrate.

FIG. 6 is a longitudinal sectional view of the axial air gap type motor 1 used in the axial air gap type vibration motor 4 which is flat in the axial direction, and 6.7 is a motor casing made of a magnetic material, and the motor gauging 6. 7 also serves as a stator yoke.

A bearing 8.9 is mounted at the center of the motor gauging 6.7, and the rotating shaft 2 of a coreless flat armature 10 constituting a rotor is rotatably supported by the bearings 8 and 9.

The coreless flat armature 10 has, for example, three air-core armature coils 12-1, 12-2, as shown in FIG. 1
2-3 are integrally formed into a disk shape by molding the outer periphery with plastic 20 so as not to overlap each other at equal intervals of 120 degrees.

Armature coil 12-1. ..., 12-3 is.

The effective conductor portions 12a and 12a' in the radial direction contribute to the generated torque, and the conductor portions L2b and 12c in the two circumferential directions do not contribute to the generated torque.

Moreover, each armature coil 12-1. ..., 123 is
In order to form a highly efficient axial gap type motor 1, the opening angle between the effective conductor portions 12a and 12a' is determined by adjusting the opening angle of the field magnet 14 (having four poles) as shown in FIG. Width equal to the width of the magnetic pole.

That is, it is formed into a 90 degree fan frame shape.

On the lower surface of the coreless flat armature 10 are two commutator pieces 11-1 concentrically with the rotating shaft 2. . . , a commutator 11 consisting of 11-6 groups is provided. The commutator 11 will be described later.

As shown in FIG. 8, a printed distribution board 13 is disposed concentrically with the commutator 11 on the lower surface of the coreless flat armature 10, and is connected to the armature coils 12-1, . . . , 12-3 for commutation. The terminals 11 are electrically connected via a printed circuit board 13 as shown in FIGS. 11 to 14.

In the cases of FIGS. 11 and 12, the Y-type connection is used, and in the cases of FIGS. 13 and 14, the connection is Δ.

On the surface of the motor casing 7, which faces the coreless flat armature 10 with an axial gap 21 in between, there is a flat circle having N poles and S poles alternately at an opening angle of 90 degrees, as shown in FIG. An annular field magnet (field magnet) 14 is fixed.

Two brushes 16 and 17 supported by an annular brush holder 15 made of plastic are in sliding contact with the inner surface of the field magnet 14 at an opening angle of 90 degrees, as shown in FIG.

・The coreless flat armature 10 is shown in FIGS. 7 and 8.

As is clear from FIGS. 11 to 14, three armature coils 12-1. . . , 12-3 are arranged at a pitch of 120 degrees, and a four-pole flat annular field magnet 14 shown in FIG. 9 and an axial gap 21 as shown in FIG. They are facing each other through. As is clear from FIG. 9, the field magnet 14 has four N-pole and S-pole magnetized alternately with an opening angle width of 90 degrees.

FIG. 11 shows coreless armature coils 12-1, . . . , 12-3 in the case of Y-type connection with the field magnet 14.
FIG. 12 shows the three armature coils 12-
1°12-3 group and six commutator pieces 11-1. ...11
- This is a wiring diagram when the commutator 11 consisting of 6 groups is connected in a Y type, FIG. 13 shows a developed view with the coreless flat armature 10 when connected with the field magnet 14 in a delta connection, and FIG. Three armature coils 12-1. ..., 1
2-3 and six commutator pieces 11-1. ..., 11-
6 is a connection diagram when the commutator 11 is connected in a delta connection.

With reference to FIGS. 11 and 12, armature coil 12-
1. ..., 12-3 connect the terminals of the negative effective conductor portions 12a to the commutator pieces 11-1.11-3.11.
-5, the other terminals are connected in common, commutator pieces 11-1 and 114, 11-2 and 11-5, 11
-3 and 11-6 are electrically connected.

Referring to FIG. 10, brushes 16 and 17 and armature coil 12-1. ..., 12-3 is the commutator piece 11-
1. . . , 11-6 are formed at equal intervals with a pitch of 60 degrees, so that the armature coils 12-1.・
..., the two brushes 16 and 17 are connected to 12-3 so that current can be passed in the forward and reverse directions by 180 electrical degrees.
are shifted by 180 electrical degrees (90 mechanical degrees) and brought into sliding contact.

The brushes 16 and 17 are connected to the positive power terminals 18 and 17 of a drive circuit (not shown), respectively. It is connected to the negative side power supply terminal 19.

13 and 14 show the Δ connection, and the armature coils 12-1. . . , the terminals of one of the effective conductor portions 12b of 12-3 are connected to the commutator pieces 11-1.11, respectively.
-3.11-5, and the other terminal is connected to commutator pieces 11-2.11-4.11-6, respectively.

Further, the other effective conductor section 12b of the armature coil 12-1 and one effective conductor section 12a of the armature coil 12-3 are electrically connected, and the one effective conductor section 12a of the armature coil 12-2 and The other effective conductor portion 1 of the armature coil 12-3
2b, and one effective conductor portion 12a of armature coil 12-1 and the other effective conductor portion 12b of armature coil 12-2 are electrically connected.

Therefore, armature coil 12-1. . . , 12-3, when the commutator 11 rotates while sliding in contact with the brushes 16 and 17, the armature coils 12-2. A current can be passed in the direction of the arrow through 12-3, and a rotational torque of the magnitude of symbol f can be obtained.
In the direction of arrow F, armature coil 12-1. ..., 12
- The coreless flat armature 10 consisting of three groups is rotated.

Therefore, if a pager 5 having such an axial gap type vibration motor 4 is worn, the pager 5 will vibrate, and from the vibration of the pager 5, it will be possible to know that there is a telephone call. .

Axial gap type motor 1 used in the above pager 5
is certainly useful, but it can simply be changed to the rotating plate 3
If you install it and use it for pager 5, 1 rotation axis 2
Since the rotating plate 3 must be accommodated in the machine, it is not suitable for mass production.

In addition to the drawback of making the pager 5 expensive,
Therefore, the motor 1 becomes long in the axial direction, which poses an obstacle to further downsizing and cost reduction of the pager 5.

Therefore, in order to eliminate the drawbacks of the conventional technology, the inventor first developed an axial gap type vibration motor that can vibrate without attaching a swivel plate to the rotating shaft and is suitable for vibrating pagers, etc., and is inexpensive and thick in the axial direction. Japanese Unexamined Patent Publication Nos. 63-290140-43 have provided a device that can be constructed to be thin, small, and lightweight.

These are designed to cause the coreless rotor armature itself to vibrate.2 For example, a weight may be provided at an appropriate position such as in an empty space of the coreless rotor armature, or the coreless rotor armature may be prevented from forming a disc. This is a useful device in which the coreless rotor armature itself vibrates and rotates.

In general, coreless vibration motors with a rotating coreless rotor armature are better than brushless vibration motors with rotating field magnets.

It is also advantageous in terms of cost.

Although it is disadvantageous in terms of cost, brushless vibration motors have lower noise because there is no noise caused by sparks generated by sliding contact between brushes and commutator, and they have a longer lifespan because they do not have brushes or commutators. It has the advantage of longevity.

This is because brushless vibration motors have a much simpler structure than coreless vibration motors.

Although they have the advantage of being easy to assemble, they also have the disadvantages of cost as described above, so in the past, almost all of them have been coreless vibration motors.

However, in recent years, pagers and the like have come to be used for multiple purposes, and the conventional

Compared to coreless vibration motors, which were expected to have a lifespan of about 500 hours at most, there is now a demand for vibration DC motors that can be expected to have a lifespan of several thousand hours or more.

[Problems to be solved by the present invention] The present invention has been made to solve the above-mentioned problems, and improves the brushless motor, which has hitherto been a bottleneck in terms of cost and weight when applied to pagers, etc. By doing so, the thickness and weight are lower than conventional coreless vibration motors.
Configuration 1 is superior in terms of assembly and cost, and does not use the disadvantageous method of protruding the rotating shaft from the motor body and attaching a rotating plate to the rotating shaft to vibrate the brushless motor, and the rotor itself is It allows itself to vibrate and rotate without the need for an additional device for vibration.
Moreover, the objective was to obtain a brushless vibration motor with an extremely long life.

[Means for achieving the object of the present invention] The means for achieving the object of the present invention is to configure a stator armature by arranging one or more iron core type armature coils such as an air core type on the fixed side, and to form a stator armature. The conductor part of one armature coil that contributes to the generated torque and the conductor part of the other armature coil that contributes to the generated torque of the other armature coil are electrically connected so that current always flows in the same direction. However, when the conductor part that contributes to the generated torque of one of the armature coils and the conductor part that contributes to the generated torque of the other armature coil that are arranged next to each other face each other, the first armature coil Magnetize a single magnetic pole, either the N pole or the S pole, with an opening angle width that does not face the conductor part that contributes to the generated torque of the other armature coil and the conductor part that contributes to the generated torque of one of the other armature coils. A single-pole type field magnet formed by the rotor is used as a rotor facing the stator armature through an air gap, and one position detection element for detecting the magnetic pole of the field magnet is disposed on the fixed side. However, a distant relative can be achieved by providing a single-phase brushless vibration motor in which a self-starting processing means for magnetically guiding the field magnet to a position where it can be started automatically is provided on the fixed side.

[Embodiment of the Invention] FIG. 1 is an exploded perspective view and longitudinal cross-sectional view of a vibrating axial gap type single-phase brushless vibration motor 22 as an embodiment of the present invention, and FIG. FIG. 3 is a longitudinal cross-sectional view of a single-phase brushless vibration motor 22 of the type
3 and a coreless stator armature 25 consisting of armature coils 24-1 and 24-2.

Hereinafter, a single-phase brushless vibration motor 22 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

Referring to FIGS. 1 and 2, an axial gap type single-phase brushless vibration motor 22 has a cup-shaped motor casing 26 made of a magnetic material with a flat open end connected to a motor casing 27 that also serves as a stator yoke. When closed, a single-phase brushless vibration motor main body 28 is configured.

Motor casing 26. ．． Bearings 28 and 29 are mounted at the center of each of the magnets 27, and a rotating shaft 30 of the field magnet 23 constituting the rotor is rotatably supported by the bearings 28 and 29.

The motor casing 27 constituting the single-phase brushless vibration motor main body 28 is provided with a protrusion 31 for generating cogging torque for self-starting, which is provided as a self-starting processing means that protrudes upward, to generate a cogging torque for self-starting. The single-phase brushless vibration motor 22 is formed at one location by punching means or the like so that the single-phase brushless vibration motor 22 can self-start. Now, the self-starting cogging torque generation protrusion 31 includes a conductor portion 24-1a extending in the radial direction of the armature coil 24-1 that contributes to the generated torque, and the armature coil 24-2.
It is formed at a position between the conductor portion 24-2b and the other conductor portion 24-2b extending in the radial direction and contributing to the generated torque. Cogging torque generation protrusion 31 for self-starting of the motor casing 27
The printed wiring board 33 having a through hole 32 formed with a through hole that substantially coincides with the motor casing 2 aligns the self-starting cogging torque generating protrusion 31 with the through hole 32.
7 by appropriate means. On the upper surface of the printed wiring board 33, there are two
Air-core armature coils 24-1 and 24-2, each formed in the shape of a flat fan frame, are arranged slightly apart in the circumferential direction so as not to overlap each other. Armature coil 24-1
and 24-2 form a coreless stator armature 25.

The armature coils 24-1 and 24-2 each have conductor portions 24-1a extending in the radial direction about the two-rotation shaft 30.
, 24-1b, 24-2a, and 24-2b are effective conductor portions that contribute to the generated torque that generates torque in a predetermined direction, and conductor portions 24c and 24d in the two circumferential directions are ineffective conductors that do not contribute to the generated torque. It has become a department.

The pendulum coils 24-1 and 24-2 have effective conductor portions 24-1a and 24-1b, 2 that contribute to the generated torque, respectively.
The outer opening angle between 4-2a and 24-2b is 180 degrees or less, and the inner opening angle is 180 degrees or less.2For example, α (α
It is formed into an air-core type with an opening angle width of 〉β〉.

Referring to FIG. 3, the armature coils 24-1 and 24-2, which are arranged next to each other, are always connected in the same direction to the conductor section 24-1a that contributes to the generated torque and the conductor section 24-2b that contributes to the generated torque of the other armature coil. 24 which are commonly connected and whose connecting terminals 34 are electrically connected to the semiconductor rectifier 35 so that current flows, and which contribute to the generated torque of the other of the armature coils 24-1 and 24-2 disposed adjacent to each other. -1b and the conductor portion 24-2a that contributes to the generated torque are electrically connected so that current always flows in the same direction. is connected to.

The opening angle width α is set to be sufficiently larger than the opening angle width β of the field magnet 23.

The reason for this is that the field magnet 23 is magnetized to have a single pole, as will be described later.

If the opening angle width β of the field magnet 23 is inside the effective conductor portions 24-1a and 24-1b, 24-2a and 24-2b that contribute to the generated torque of the armature coil 24-1, 24-2, If it is not sufficiently smaller than the opening angle width α, the effective conductor portions 24-1a and 24-1b, 24-2a and 2 that contribute to the generated torque of the armature coil 24-1 or 24-2.
It will face both 4-2b.

As a result, armature coil 24-1 or 24-2
Effective conductor portions 24-1a and 24- which contribute to the generated torque of
Effective conductor portions 24-1b and 24-2a contribute to the generated torque by 2b, which generates rotational torque in a predetermined direction.
This causes torques in opposite directions to be generated, which are canceled out by the torques generated in opposite directions, and as a result, rotational torque in the predetermined direction is no longer generated, and the field magnet 2
3 becomes unable to rotate in a predetermined direction.

Therefore, the field magnet 23 contributes to the generated torque of one of the armature coils 24-1 and 24-2 adjacent to each other, and the conductor portion 24-1a contributes to the generated torque of the other armature coil 24-1 and 24-2.
When the field magnet 23 is in a state where it can generate torque in a predetermined direction in opposition to the armature coil 24-
1 and 242, which contribute to the generated torque of the other side and the conductor part 24 which contributes to the generated torque of one side.
-2a, so as not to face the field magnet 23.
The opening angle width β has been determined.

In this way, rotational torque in one direction is always obtained, and the field magnet 23 is always self-starting and continuously rotating with the help of the cogging torque generated by the magnetic attraction force of the self-starting cogging torque generating protrusion 31. The single-phase brushless vibration motor 22 can be obtained.

A magnet member 37 is fixed to the rotating shaft 30 at a portion 37B where the field magnet 23 is not magnetized, and rotatably supports the magnet member 37. The fan plate-shaped portion 37A of the magnet member 37, which spreads approximately radially at an angle of β with the rotating shaft 30 as a fulcrum, has an upper surface magnetized with an N pole and a lower surface with an S pole. Single f! The field magnet 23 of this structure is formed by magnetization. Of course, the formation may be reversed.

The reason why the armature coils 24-1 and 24-2 are formed to have an angular width smaller than 180 degrees and are placed apart from each other with a slight interval is that they always start automatically when the single-phase brushless vibration motor 22 stops. The field magnet 23 is magnetically attracted to a position where it can be stopped, and the position detection element 38 is activated when starting.
When the semiconductor rectifying device 35 is energized based on the output signal from the armature coil 24-1, the conductor portion 24-1a extending in the radial direction of the armature coil 24-1 and the armature coil 24-2, which contribute to the generated torque, are sure to be connected. The self-starting cogging torque generating protrusion 31 is configured to allow the field magnet 23 to self-start in a predetermined direction by the torque generated by the conductor portion 24-2b extending in the radial direction and contributing to the other generated torque. The conductor portion 24-1a extends in the radial direction of the pendulum coil 24-1 and contributes to the generated torque, and the other conductor portion 24-1 extends in the radial direction of the armature coil 24-2 and contributes to the generated torque. 2b. Also, the field magnet 23 is connected to the armature coil 24-
The armature coil 24-1 stops at a position facing the conductor portion 24-1a extending in the radial direction of armature coil 24-2, which contributes to the generated torque, and the other conductor portion 24-2b extending in the radial direction of the armature coil 24-2, contributing to the generated torque. If so, a conductor portion contributing to the generated torque extending in the radial direction of the armature coil 24-1 on one side so that the position detection element 48 can detect the S pole of the field magnet 23 when the current is applied. 24-1a and the other conductor portion 24-2b which extends in the radial direction of the armature coil 24-2 and contributes to the generated torque. A position detection element 38 for detecting the magnetic pole of the magnetic magnet 23 is provided. Further, in the empty space above the printed wiring board 33, a semiconductor rectifier forming IC 39 for forming the semiconductor rectifier 35 is arranged.

[Operation of the invention] Since the present invention has the above configuration, when no power is applied.

The field magnet 23 is magnetically attracted by inertia and by the self-starting cogging torque generation projection 31, and is located at a position facing the self-starting cogging torque generation projection 31;
That is, one conductor portion 24-1a extending in the radial direction of the armature coil 24-1 contributes to the generated torque, and the other conductor portion 24-2 extending in the radial direction of the armature coil 24-2 contributes to the generated torque. It stops at a position facing 2b.

Therefore, when the second current is energized, the position detection element 38 detects the S magnetic pole of the field magnet 23, so the semiconductor rectifier 35 detects the electrical Child coil 24-1.
24-2, for example, a conductor portion 24-1a that extends in the radial direction of the armature coil 24-1 and the armature coil 24 contributes to the generated torque. The rotation torque in the direction of arrow F is obtained by the conductor portion 24-2b extending in the other radial direction of -2 and contributing to the generated torque, and the field magnet 23 rotates in the direction of arrow F.

The field magnet 23 no longer faces the self-starting cogging torque generation protrusion 31, and the conductor portion 2 extends in the radial direction of the armature coil 24-1 and contributes to the generated torque.
4-1a and the conductor portion 24-2b extending in the radial direction of the armature coil 24-2 and contributing to the generated torque, when the rotational torque in the direction of arrow F is no longer obtained, the armature coil 24-2 The conductor portion 24-1b extending in the radial direction of the armature coil 24-2 contributes to the generated torque of the other armature coil 24-2, and the conductor portion 24-2a extending in the radial direction of the armature coil 24-2 contributing to the generated torque of the other armature coil 24-2 acts in the direction of the arrow F. A conductor portion 24-1b that provides rotational torque and contributes to the generated torque of the other extending in the radial direction of the armature coil 24-1, and a conductor portion 24-1b that contributes to the generated torque of one extending in the radial direction of the armature coil 24-2. At the stage when the rotational torque in the direction of arrow F is no longer obtained by the conductor portion 24-2a, the field magnet 23 is Rotate to a position where it can start automatically.

Similarly to the above, one conductor portion 24-1a extending in the radial direction of the armature coil 24-1 contributes to the generated torque, and the other conductor portion extending in the radial direction of the armature coil 24-2 contributes to the generated torque. Since rotational torque in the direction of arrow F can be obtained by 24-2b, the field magnet 23 can be continuously rotated.

[Other Examples] In the above embodiment, the single-phase brushless vibration motor 22 has a single-sided excitation structure in which the coreless stator armature 25 is disposed on one side facing the field magnet 23. A double-sided excitation structure in which the armature 25 is provided may be used.

In addition, in the above embodiment, a very desirable example was shown in which two air-core armature coils were arranged so that they did not overlap each other in a plane, but a conductor portion that generates counter torque was provided at a position facing the field magnet. If the armature coils are arranged so as not to cause this, the number of armature coils may be three or more, and the armature coils may be arranged so as to overlap, and if a predetermined thrust is obtained. , the number of armature coils may be one.

In addition, an example was shown in which the armature coil was formed using an air-core armature coil formed by winding a conductor wire in many turns. However, if a coreless armature can be constructed, etching means or punching of the conductor can be used. It may be formed by a sheet coil or a printed coil formed by a method such as the above.

[Effect of the invention] According to the single phase brushless vibration motor of the present invention.

The field magnet has a single-pole configuration, which eliminates the need to form it into a disk shape, making it lighter in weight and cheaper to form.It also rotates to generate sufficient vibration, so the structure is extremely simple. Therefore, it can be made smaller, ultra-lightweight, and thin. In addition, it is not necessary to make the rotating shaft protrude from the mortar body and fit the rotating plate onto the rotating shaft to prevent the brushless motor from vibrating, making it ideal for incorporating into devices such as pagers. I can do two things. Moreover, since it is a brushless motor, it has a long life and can be configured with an extremely inexpensive circuit that requires only one position sensing element and one drive circuit, compared to conventional armature rotating type motors. You can get very advantageous things.

In particular, in the present invention, strong magnets such as neodymium, boron, and iron-based magnets that have a strong magnetic force despite having a thickness of about 1 mm or less have been formed recently.
It is particularly useful to perform predetermined magnetization using such a strong magnetic material.

and a developed view of a coreless stator armature consisting of two armature coils, Figure 4 is an explanatory diagram of a pager using a conventional axial gap type vibration motor, and Figure 5 is an axial gap type pager using a rotating plate. Figure 6 is an explanatory diagram of a coaxial air gap type motor. Figure 7 is a top perspective view of the coreless flat armature of a coaxial air gap type motor, Figure 8 is a bottom view of the same coreless flat armature, and Figure 9 is an example of the coreless flat armature used in a coaxial air gap type motor. Fig. 10 is an explanatory diagram of the relationship between the commutator and brushes, Figs. 11 and 12 are explanatory diagrams of the case where the armature coil group and the commutator piece group are connected in a Δ, 13 and 14 are explanatory diagrams when the armature coil group and the commutator segment group are connected in a Y-shape.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a vibrating axial gap type single-phase brushless vibration motor as an embodiment of the present invention, FIG. 2 is a vertical sectional view of a coaxial gap type single phase brushless vibration motor, and FIG. Figure 3 shows a field magnet [Explanation of symbols] 1... Axial gap type motor, 2... Rotating shaft, 3...
・Swivel plate, 4... Axial gap type vibration motor, 5...
Pager, 6.7...Motor casing, 8,9...
・Bearing, 10...Coreless flat armature, 11...Commutator. 11-1. ..., 11-6... Commutator piece. 12-1. ..., 12-3... armature coil,
12a, 12a'... Effective conductor portion contributing to generated torque, 12b, 12c... Conductor portion not contributing to generated torque, 13... Printed wiring board, 14... Field magnet, 15... Brush holder, 16.17...
Brush, 18... Positive side power supply terminal, 19... Negative IT source terminal. 20...Plastic, 21...Void. 22...Single-phase brushless vibration motor. 23... Field magnet. 24-1.24-2... Armature coil. 24-1a...One effective conductor part that contributes to the generated torque, 24-1b...The other ineffective conductor part that contributes to the generated torque, 24-2a...The other ineffective conductor part that contributes to the generated torque . 24-2b...One effective conductor portion that contributes to the generated torque, 24c, 24d...Ineffective conductor portions in the circumferential direction that do not contribute to the generated torque, 25...Coreless stator armature,
26.27... Motor casing, 28... Single-phase brushless vibration motor body, 28.29... Bearing, 30...
··Axis of rotation. 31... Protrusion for generating cogging torque for self-starting. 32... Through hole, 33... Printed wiring board. 34... Connection terminal, 35... Semiconductor rectifier, 36
... Connection terminal, 37... Magnet member, 37A.
...Fan plate-shaped portion, 37B...A portion where the field magnet is not magnetized. 38... Position detection element, 39... IC for semiconductor rectifier, 40... Output terminal.

Claims (1)

[Claims] A single-phase brushless motor comprising the following components (1) to (5). (1) The stator armature is configured by arranging one or more iron coreless armature coils such as air core type on the fixed side. (2) The conductor portion that contributes to the generated torque of one of the armature coils arranged next to each other in the stator armature and the conductor portion that contributes to the generated torque of the other armature coil always have currents in the same direction. The electrical connections must be made so that the flow of (3) When a conductor part that contributes to the generated torque of one armature coil and a conductor part that contributes to the generated torque of the other armature coil that are arranged next to each other face each other, the first armature Magnetize a single magnetic pole, either the N pole or the S pole, with an opening angle width that does not oppose the conductor part that contributes to the generated torque of the other coil and the conductor part that contributes to the generated torque of one of the other armature coils. The stator armature is provided with a single-pole type field magnet formed as a rotor that faces the stator armature with an air gap interposed therebetween. (4) One position detection element for detecting the magnetic pole of the field magnet is disposed on the fixed side. (5) Self-start processing means for magnetically guiding the field magnet to a position where it can be started automatically is formed on the fixed side.