JPH0255563A - Single phase brushless vibrating motor - Google Patents

Abstract

PURPOSE:To mass-produce a small single phase brushless vibrating motor at a low cost by bearing a magnet rotor capable of swiveling so as to vibrate eccentrically and placing two kinds of small permanent magnets to suitable positions. CONSTITUTION:A signal phase brushless motor 14 is so constituted that an armature coil 17 of a coreless construction provided with an aperture of 180 deg. in conductors 17a-17b contributing to axial generating torque is fixed to the internal surface of a cylindrical motor casing 15 of magnetic substance to form a coreless stator armature 16. A position detecting element 20 is placed at a position to detect magnetic flux of a magnet rotor 18. A rotor 19 has the two pole magnet rotor 18, and it is provided to bearings 24-25 so that it is capable of swiveling. The rotor 19 is slid from the center of a rotary shaft 19 to mount so that the rotor 18 vibrates eccentrically and turns. In addition, for self-starting, its magnetic pole 18N and an S pole permanent magnet 30 to absorb magnetically are provided. Accordingly, the rotor 18 turns while making a large eccentric vibration.

Description

[Detailed Description of the Invention] [Industrial Application Field of the Invention] The present invention is a signal receiver for blind people, which is used for the purpose of transmitting a predetermined signal and for giving a light pie break to the human body, etc. The pager is built into a pinsurge machine or a pager (hereinafter referred to as a pager) that is expected to provide the following information, and is activated by applying vibrations to the human body through the vibrations of the pager body, etc. The present invention relates to a single-phase brushless vibration motor suitable for devices that can be used for the purpose of notifying others.

[Prior art and its problems] Many 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 apparatus, the prior art had the following drawbacks, as shown below with respect to Veja.

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

Here, many conventional pagers have a built-in sound generator, and many of them are configured so that they do not make a sound, so they emit a loud sound regardless of the location, and the sound can be heard by people around them. cause trouble to

In addition, the noise has even caused 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.

As a means to cause the pager to vibrate.

Although various methods are conceivable, an inexpensive small direct current motor is considered to be promising for applying vibration to a small pager.

Particularly, DC motors are inexpensive and small, yet have good efficiency and torque characteristics, and are suitable for high-speed rotation.

Here, as an example of a conventional DC vibration motor 1 used in a pager, etc., as shown in FIG.
The structure is equipped with.

The DC vibration motor 1, which is constructed by attaching the rotating plate 4 to the rotating shaft 3 of the cup-shaped coreless motor 2 in this manner, is built into the pager, and when the pager is driven, the pager will vibrate.

Therefore, if a user wears a pager having such a DC vibration motor 1, the pager will vibrate, and the user will be able to know that there is a telephone call from the vibration of the pager.

According to the DC vibration motor 1 configured using such a cup-type coreless motor 2, since the cup-type coreless motor 2 is very expensive, the DC vibration motor 1.
Furthermore, a pager using this motor 1 has the drawback of being very expensive.

Two types of DC motors can be selected as the DC vibration motor, and a three-phase DC motor 5 shown in FIGS. 8 and 9 is one that can be made compact and inexpensive.

This DC motor 5 has a two-pole field having N and S magnetic poles formed with an opening angle width of 120 degrees on the inner surface of an annular stator yoke 6 (constituting the motor body) on the fixed side. 7N and 7S are fixed. The field magnets 7N and 7S are formed to extend in the radial direction at equal intervals through a radial gap.
armature coils 9-1. ．． A three salient pole type rotor armature 10 formed by winding 9-2 and 9-3 is rotatably installed.

The rotor armature] 3-segment commutator piece 11-1 at 0
．． A commutator 1 consisting of 11-2.1.1-3 is provided, and two terminals are connected to the positive and negative terminals of a DC power supply, respectively, which are arranged at an opening angle of 180 degrees on the commutator 11. brush 1
．． 2-1. It has a three salient pole structure configured to rectify current by sliding contact with 12-2.

The opening angle of each of the T-shaped salient poles 8-1.8-2.8-3 in the circumferential direction is 105 degrees, and the pitch is 120 degrees.

The three-phase DC motor 5 having such a structure is easily mass-produced at low cost, and has relatively good efficiency, so it is useful and has been widely used in relatively inexpensive devices. .

However, in the case of this DC motor 5, as in the case of the coreless motor 2, the current is rectified using a furan and a commutator, so there is a drawback that the life is short, and the structure of the armature that makes up one rotor is short. The disadvantage is that it becomes complicated.

Generally speaking, the lifespan of the DC motor used in a pager is such that steaming is not necessary, and for other devices other than pagers, a long lifespan is often expected. In order to be able to apply the same, it is desirable to use a flashless smoke as the DC motor.

In addition, in the case of a pager, unlike the conventional one that generates an alarm sound, if the structure is made to notify by vibration,
The vibration of the pager becomes a comfortable vibration for both human bodies,
Because pagers are expected to have positive effects both mentally and physically, known as the massaging effect, unlike conventional pagers that issue audible alarms, there are many cases in which pagers are left running for long periods of time before they are turned off, and even more so when the switch is turned off. It is also expected that users can enjoy high inflator effects such as pine surge when receiving radio waves.

Due to these circumstances, it is expected that DC motors for pagers will have an increasingly long lifespan.

In this sense, as a direct current motor for a pager, it is often advantageous to use a flashless motor with a structure in which a magnet rotates.

As a brushless motor that simply rotates, it is desirable to use a single-phase brushless motor that can be manufactured at low cost.

However, since the single-phase brushless motor has a dead center, it has the disadvantage that it cannot be started automatically unless other appropriate self-start processing means are used.

[Problem of the Invention] An object of the present invention is to obtain a single-phase brushless vibration motor that is useful for such pagers and is expected to have a long service life.

In particular, the present invention is a single-phase brushless vibration motor made based on the above circumstances, which uses a Macnet rotor as a rotor and has a simple stator structure, thereby making the motor extremely simple in structure and special. It is possible to quickly and reliably move the magnetic rotor to the most desirable position without having to install a self-starting processing means that is complicated in configuration, and to enable self-starting, and also to obtain a large vibration force. The object of this invention was to obtain a single-phase brushless vibration motor suitable for use in pagers and many other devices that can be mass-produced at low cost.

[Means for achieving the object of the invention] The object of the present invention is to change the magnetic poles of the N pole and sii to 2n (n
is an integer greater than or equal to 1) is rotatably supported so that it rotates with eccentric vibration, and an armature coil with a coreless structure is mounted on the side of the motor case made of a magnetic material that faces the magnet rotor through an air gap. A coreless stator armature formed by one or more magnets is provided at the same phase position, one position detection element is provided on the stator armature side, and the magnet rotor is magnetically positioned at a position where it can start automatically when no current is applied. A first permanent magnet is provided on the motor case side for attracting and bringing the magnet to a stop position, and the first permanent magnet is connected to the magnet rotor from the side surface of the conductor that contributes to the generation of the armature coil. 2 minutes in the direction opposite to the direction of rotation], and one or more magnetic screws are arranged at a position between +-1 leading width of the magnetic pole, or at a position in phase with this position, and when no current is applied, the magnetic screw 1 is set by the first permanent magnet. - Magnetic screw 1 so that the rotor is located in a position where it can self-start - a second permanent magnet with a magnetic pole opposite to the first permanent magnet to repel the rotor; This can be achieved by arranging it at a position where the magnetic attraction force to the rotor is weaker.

[Embodiments of the Invention] [First Embodiment of the Invention] FIG. 1 is a longitudinal sectional view of a single-phase brushless vibration motor 14 as a first embodiment of the invention, and FIG. 2 is a longitudinal sectional view of the single-phase brushless motor 14 of FIG. 14, FIG. 3 is a perspective view of the air-core armature coil 17 constituting the stator armature 16, FIG. 4 is a perspective view of the rotor 19 with the magnet rotor 18, and FIG. 5 is the magnet. FIG. 3 is a developed view of a rotor 18 and an armature coil 17.

This will be explained below with reference to FIGS. 1 to 5.

The single-phase brushless vibration motor 14, which has a diameter of about 7 mm or more in the first embodiment of the present invention, has a cylindrical motor case 15 made of a magnetic material (which constitutes a stator yoke), which has a diameter of 7 mm or more. Contributing conductor parts 17a and 1
A coreless stator armature 10 is formed by fixing one air-core armature coil 17 having a coreless structure and having a C-shaped cross section as shown in FIG. .

Armature coil 17 parallel to rotation axis 3 of armature coil 17
The conductor portions 1-7a and 17b are conductor portions that contribute to the generated torque, and the conductor portion 17c is perpendicular to the rotation axis 3.
], 7 d is a conductor portion that does not contribute to the generated torque.

The motor case 1 is in the same phase as the conductor portion 17a or 17b of the armature coil]7 on the stator armature 16 side.
One position detection element 20 such as a pole element or a pole IC is disposed at a position on a printed circuit board 21 disposed at the lower part of the magnet rotor 18 at a position where the magnetic flux of the magnet rotor 18 can be detected.

The terminals of the armature coil 17 are connected to the printed circuit board 21.
It is electrically connected to a printed pattern (not shown) formed on the printed circuit board 21, and is electrically connected to a drive circuit (not shown) (drive circuit 27 shown in FIG. 5) disposed on the printed circuit board 21. Lead wire 2 connected to the printed circuit board 21
3 is drawn out to the outside through a through hole provided in a lower cap 22 attached to the lower part of the motor case 15.

A two-pole magnet rotor 18 having an N pole and Sfi magnetic poles 1.8N and 18S magnetized with an opening angle width of 180 degrees through a radial gap with the stator armature 16.
One rotor having a rotor is rotated by a rotating shaft 3 provided on two rotors 19 so as to rotate relative to the stator armature 16 by a bearing 24 attached to an upper cap 28 and a bearing 25 attached to a lower cap 22. It is set up freely.

The rotor 19 is mounted at an eccentric position with the rotating shaft 3 shifted from the center of the rotor so that the magnet rotor 18 rotates with eccentric vibration.

In the single-phase brushless motor 14 formed in this way, -
Since there is no drive circuit (not shown) for phase components (drive circuit 27 in FIG. 5) and one position detection element 2OL, self-starting cannot be performed with this structure.

For this reason, in order to enable self-starting, the magnetic rotor 18 is magnetically attracted to the inner surface of the motor case 15 where it can be started automatically when no electricity is applied, and the magnetic rotor 18 is magnetically attracted and stopped so that the magnetic rotor 18 is positioned at a position where it can be started automatically. A permanent magnet 30 with an S pole that magnetically attracts the large magnetic pole of the magnet rotor 18 (in this example, the N pole 18N)
is fixed. The S-pole permanent magnet 30 preferably allows the magnetic rotor 18 to start automatically, and has the least loss during startup, resulting in a single-phase brushless vibration motor 111 with the highest efficiency.
In order to obtain the rotation direction of the magnet rotor 18 of the conductor portion 17a (or/and 17b may be used) which contributes to the generated torque of the armature coil 17 constituting the stator armature 16, the direction of the arrow A in FIG. ) in the direction opposite to the rotational direction of the magnet rotor 18.
1/1 magnetic pole width, i.e. 90 degree angle width, the motor case 15 position or this position (preferably at a 45 degree angle from the conductor portion 17a or in the opposite direction of arrow A) One or more are formed at the same phase position (for example, the position shown by the dotted line encircling portion 26 in FIG. 2).

Further, in the present invention, the magnet rotor 18 is
It is desirable that the N-pole and S-pole permanent magnets 30 are magnetically attracted to each other, and that the Macnet rotor 18 is stopped at a position where it can self-start. This means that even while the magnet rotor 18 is rotating, the single-phase brushless vibration motor 14 can be quickly brought into such a state, and the single-phase brushless vibration motor 14 has high vibration efficiency.

For this reason, in order to magnetically repel the magnet rotor 18 by the S-pole permanent magnet 30 when no electricity is applied, the magnet rotor 18 is magnetically repelled so that the magnet rotor 18 is located at a position where it can be self-starting. The N-pole permanent magnet 3 opposite to the permanent magnet 30 is placed in a position where the magnetic attraction force of the S-pole permanent magnet 30 to the Macnet rotor 18 is weaker than that of the S-pole permanent magnet 30 and 180. It is fixed at a position on the inner surface of the motor case 15 which is symmetrical.

Because of the presence of the S-pole permanent magnet 30, when no current is applied (stopped) and during rotation, the S-pole permanent magnet 30 and the N-poles 1.8 of the magnets 1 to I coater 18 are connected to each other through a magnetic gap.
Because N and N magnetically attract each other.

Furthermore, since the S pole 18S of the magnet rotor 18 and the S pole permanent magnet 30 magnetically repel, the magnet rotor 18 can start automatically and continue rotating. In addition, since there is the above-mentioned N-pole permanent magnet 31, when no electricity is applied (when stopped)
During rotation, the N-pole permanent magnet 3] and the S-pole 18N of the magnet rotor 18 magnetically repel each other through the magnetic gap. Since the permanent magnet 31 of the pole is magnetically attracted, it helps the self-starting of the magnet rotor 18 (with the vine,
The magnetic rotor [8] is then magnetically rotated and moved to a position where it can continue rotating.

Referring to FIG. 5, a developed view of the magnet rotor 15 and the armature coil 17 will be explained. The armature coil 5 is located at the position indicated by the dotted line, and is magnetically operated by the S-pole permanent magnet 30 when not energized. It shows a state where it is in the suction position and stopped. That is, at startup, the magnet rotor] 8 is stopped at the position where the armature coil 17 is not shown by the dotted line. At this time, the 9 position detection element 20 is also
Since the magnetic pole 8 (N pole 18N in Fig. 5) is detected and a signal can be output, in this state, energizing the armature coil 7 via the drive circuit 27 is done by Fleming. It is in a state where rotational torque can be generated according to the left-hand rule.

Furthermore, since the maximum starting torque is obtained when the tanet rotor 18 is rotated by 45 degrees, it is possible to obtain an efficient single-phase flanging vibration motor 111 with less loss during starting. In addition, the code 29-1. ．． 2
]-2 indicates a positive power supply terminal and a negative power supply terminal, respectively.

Therefore, when the armature coil 17 is energized by the drive circuit 27 based on the signal from the second position detection element 20, the magnet rotor 18 rotates in the direction of arrow A, and the slight rotational deviation of the Dunnett rotor is indicated by the solid line. Since the armature coil 17 and the magnet rotor 18 correspond to each other as shown, maximum torque is generated at this time and rotation continues. Even when the magnet rotor 18 rotates and corresponds to the dead center position, the magnet rotor 18 vibrates and rotates eccentrically, continues to rotate due to inertia, and furthermore, the N-pole permanent magnet 3 ] Due to the magnetic repulsion of the S-pole permanent magnet 30 and the magnetic attraction of the S-pole permanent magnet 30, the magnet rotor 18 is magnetically repelled and attracted to escape from the dead center position, and the position detection element 20 immediately moves to the magnet rotor 18. Since the magnet rotor 18 rotates to a position where it can detect the magnetic pole of the magnet and output a signal, the armature coil [7] is energized in a predetermined direction, and the magnet rotor 18 continues to rotate.

In addition, the magnetic rotor 18 takes into account the magnetic repulsive force of the permanent magnet 31 and the magnetic attractive force of the permanent magnet 30, and is eccentrically housed on the rotating shaft 3.
Rotates while making large eccentric vibrations. For this reason, if the rotating shaft 3 is equipped with the rotating plate 4 constituting the eccentric weight as shown in FIG. 7, the eccentric vibration will also increase.
Therefore, it is possible to obtain a compact single-phase flashless smoke which is most suitable for equipment in which large vibrations are expected.

[1] Single-phase brushless vibration motor according to the present invention [4] is capable of generating a large vibration force;
As shown in FIG. 1, the magnet rotor 18 rotates with large eccentric vibrations even without the need to make the rotating shaft 3 protrude from the motor 14 body and attach the rotating plate 4 to the protruding rotating shaft 3. Since large vibrations are generated in the axial and rotational directions, there is no need for the rotating shaft 3 to protrude from the main body of the single-phase brushless vibration motor 14 as shown in FIG. 1, and the rotating plate 4 can also be eliminated. [Single-phase brushless vibration motor] 4 can be made compact in the axial direction, and can be easily mass-produced.

In addition, since the rotating shaft 3 does not need to protrude from the motor 14 body, the motor 14 can be made shorter in the axial direction as described above, but conversely, the motor 14 can be made shorter or the motor 14 can be made longer. In this case, it is possible to generate a larger torque and therefore a larger vibration force.

[Second Embodiment of the Invention] FIG. 6 is a cross-sectional view of a single-phase brushless morph vibration 14'' showing a second embodiment of the present invention.

In the single-phase brushless motor 14 shown in the first embodiment, the rotating shaft 3 is fixed at a position smooth from the center of the magnet rotor 18 constituting one rotor, so that the magnet rotor 18 vibrates eccentrically. In the single-phase brushless morph 14' of the second embodiment, a part of the shape of the magnet rotor 18° itself has been removed so that it rotates eccentrically. .

Since the magnet rotor constructed in this way] uses an angle of 8 degrees, the one-rotation shaft 3 is positioned at the center of the magnet rotor 18' (=j) to constitute the rotor 19'.

The stator armature 16' is formed so that the opening angle of the conductor part that contributes to the generated torque is slightly narrower than the opening angle width of 180 degrees.
Air-core armature coils 17''-1 and 17'-2 are arranged adjacent to each other on the inner surface of the motor case 15' so as not to overlap each other.

An S-pole permanent magnet 30 and an N-pole permanent magnet 31 are arranged and fixed at the same positions as in the first embodiment of the motor case 15'.

The principle of rotation of this single-phase brushless morph 14' is the same as that of the single-phase brushless motor 14, so the explanation thereof will be omitted.

[Other Embodiments of the Invention] In the embodiments described above, permanent magnets were used to self-start the magnetic rotor.

A reluctance torque generating member may be formed at a position where the same purpose can be achieved, and the effect thereof may be taken into account.

Further, although an example has been shown in which two permanent magnets having magnetic poles opposite to each other are used, two or more permanent magnets may be used.

Furthermore, in the above embodiments, a one-pole or two-pole magnet rotor was shown, and an example was shown in which a coreless stator armature consisting of one or two armature coils was used, but the present invention is not limited to this. It may be constructed using a coreless stator armature consisting of a magnetic rotor with 2n (n is an integer of 1 or more) poles and m armature coils (m is an integer of 1 or more). It goes without saying that the south pole magnetic poles may be integrally formed or may be formed of segments separated from each other.

The armature coil also showed the optimum shape.

It is not limited to the armature coil shown above.

[Effects of the Invention] The present invention provides single-phase brushless vibration that can be self-starting by rotatably supporting a magnet rotor so that it vibrates eccentrically, and by arranging two types of small permanent magnets at appropriate positions. This has the effect that the motor can be made smaller and mass-produced at low cost.

Moreover, in this case, if the rotating plate is fixed to the rotation axis, the vibration effect can be further increased.

Since the motor itself has a structure that vibrates eccentrically,
Even if the rotating shaft protrudes from the motor body and a rotating plate is not attached to the protruding rotating shaft, the magnetic rotor rotates with large eccentric vibrations, which generates large vibrations in the direction of rotation on the axial axis. arise. Therefore, there is no need for the two rotating shafts to protrude from the main body of the single-phase brushless vibration motor, and there is no need for a rotating plate, so the phase-perforated brushless vibration motor can be made compact in the axial direction, and -) it can be easily mass-produced.

Also, since the rotating shaft does not need to protrude from the motor body,
As mentioned above, the motor can be made shorter in the direction of axis Jj, but on the contrary, it can be made shorter (1. If the motor is made longer, a larger torque will be generated, and therefore, It is also possible to generate larger vibrational forces.

As described below, the single-phase brushless vibration motor of the present invention is
It's not just Nagai Mikoto, but it has the effect of being useful and capable of providing sufficient performance when used in devices that are expected to generate large vibrations, such as pagers.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a single-phase vibration motor according to the first embodiment of the present invention, and FIG.
Figure 3 is a perspective view of the armature coil, Figure 4 is a perspective view of a rotor with a two-pole Macrotor, and Figure 5 is a perspective view of the rotor with the MacNet +7- rotor in Figure 4. Electric machine 1' in Figure 4
6 is a cross-sectional view of a phase brushless vibration motor, FIG. 7 is an explanatory diagram of a conventional DC vibration motor, and FIG. 8 is an explanatory diagram of a conventional DC vibration motor. Figure 9 is an exploded perspective view of a 3-phase DC motor with 3 salient poles, and shows the DC vibration motor when viewed from the side with the flange holder and knob removed (the flange is shown). "Explanation of symbols" 1. DC vibration motor, 2. Cup-shaped coreless smoke, 3. Rotating shaft, 4. Swivel plate (eccentric weight), 5
・3-phase DC motor 6 data yaw, 7N N pole field, 7S
・ S pole field 8-1.8-2.8-3 ・ T-shaped salient pole 9-1.9
-2.9-3. Armature coil 10... 3 salient pole type rotor armature, 11. Ryuko, 11-1.1 ], -]2.
11-3 child piece, 12-1.122... flange 1.4
, 14°...Single-phase flush smoke 15...Cylindrical motor case 1.61.6'...Stator armature 17.17'
-], 17' -2 Le 18 18' ... Macnet mouth 19 19'
...Rotor, 20 Element, 21... Printed circuit board cap, 23... Riet wire 24.25... Bearing, 2G... Dotted line enclosure. 27... Drive circuit, 28... Upper cap 29-1
...Positive side power terminal, 29-2 side power terminal, 30...
S-pole permanent magnet 31/N-pole permanent magnet. Negative/commutating armature = 1 Ita position detection 22- ・Lower alignment Fig. 7

Claims (3)

[Claims] (1) A magnet rotor having 2n N-pole and S-pole magnetic poles (n is an integer of 1 or more) is rotatably supported so as to rotate eccentrically, and is opposed to the magnet rotor through an air gap. A coreless stator armature formed by arranging one or more armature coils of a coreless structure at the same phase position is provided on the motor case side made of a magnetic material, and one or more armature coils are arranged on the stator armature side.
A first permanent magnet is provided on the motor case side for magnetically attracting the magnet rotor to a position where it can self-start when no current is applied and bringing it to a stop position. 1 or more at a position extending from the side surface of the conductor that contributes to the generated torque of the armature coil by a half magnetic pole width in a direction opposite to the rotational direction of the magnet rotor, or at a position in phase with this position. and a second magnetic pole opposite to the first permanent magnet in order to magnetically repel the magnet rotor so that the magnet rotor is located at a position where the magnet rotor can be self-started by the first permanent magnet when no electricity is applied. A single-phase brushless vibration motor comprising a permanent magnet arranged at a position where the magnetic attraction force of the first permanent magnet to the magnetic rotor is weaker than that of the first permanent magnet. (2) The single-phase brushless vibration motor according to claim (1), wherein the magnet rotor is formed in a shape that rotates while eccentrically vibrating. (3) The single-phase brushless vibration motor according to claim (2), wherein the magnetic rotor is provided with a rotating shaft at an eccentric position so as to rotate with eccentric vibration.