JPH04101645A - Electromagnetic vibrator - Google Patents

Abstract

PURPOSE:To keep the flat structure while eliminating a weak point of the short life and doing away with noise to be made by a commutator and by a brush filling one of the spaces of the vibrator with non-magnetic substance having weight. CONSTITUTION:A circular plastic magnet 5 is so magnetized that four 90-degree areas 5a, 5b, 5c and 5d may become either of the N or S magnetic pole. At that time, any two adjacent magnetic poles do not have the same polarity. Between the magnetic poles 5a and 5b, a square space 21 is made. This square space 21 is filled with substance having a large specific gravity, such as lead, as shown by a dotted area 21. When an armature coil is placed at the center of each 90-degree area, a Hall element 11a is opposed to the boundary area between the N and S magnetic poles which are located outside the N and S magnetic poles 5a-5d and are magnetized to the same phase with the magnetic poles 5a-5d. Since the space 21a which is shown by the dotted area 21 is filled with the substance having weight, vibration is caused with rotation of a magnet rotor 5. Consequently, this device works as an electromagnetic vibrator effectively.

Description

[Detailed Description of the Invention] [Industrial Application Field] When a pager receives a received signal, it is used to generate vibration and notify the user.

For a similar purpose, for example, when a blind person carries the device and receives a detection signal from an infrared sensor when approaching an obstacle, the device of the present invention applies vibration to the hand holding the device to notify the user of the obstacle, thereby avoiding the obstacle. Used for walking equipment.

[Conventional technology]

The following two examples are currently used for the same purpose.

A first example is a DC motor having an elongated cup-shaped rotor with a diameter of about S-A millimeters, and an eccentric weight attached to the rotating shaft.

Second example: 7 of the armature coil of a rotating armature of a flat DC motor with a diameter of J mm and a thickness of 3 to q mm.
This section is removed to generate vibration.

[Problems to be solved by the present invention] First problem The first problem mentioned above in the section of the prior art. The electric motor in the example No.
Due to their construction, it is impossible to remove the commutator and brush.

Therefore, there is a problem that the service life is limited, and the commutator and brush are extremely small, making them expensive and shortening the service life.

Second issue The first issue mentioned above. The electric motor in the second example has a commutator and brushes, so the diameter of the rotating shaft is small, and the inner diameter of the bearing (oilless bearing) that supports it is also small ().

Therefore, when used as a vibrator, the force due to the collision between the rotating shaft and the bearing increases, significantly shortening the service life.

Third issue 1st. The means to solve the second problem is to use a brushless motor, but in order to make it more compact, other than a flat disk-shaped l-phase brushless motor (hereinafter referred to as a semiconductor motor). There is no way.

In the case of a two to three phase electric motor, the energization control circuit has a large problem.Even when a vibrator using a flat/phase semiconductor electric motor is adopted, there are the following two problems.

Seventh, if the well-known cogging torque is used as a self-starting means, the torque is small, so the rotor will rotate due to the action of gravity depending on the position of use due to the attached weight, and the rotor will self-start. There is a problem that self-starting may fail if the device deviates from the desired position.

Second, if an eccentric weight is attached to the rotating shaft, the thickness increases, making it difficult to mount it inside the pager.

[Means to solve problems]

In an axial gap type/phase DC motor in which a disk-shaped fixed armature and a magnet rotor opposing it serve as field magnetic poles, nine 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, and the opposing parts of the seven adjacent sets of N and S magnetic poles are each removed by a predetermined width, and this removed part is filled with a heavy non-magnetic material, and the removed part and The opposing portions of the adjacent pair of N and S magnetic poles on the opposite side are also removed with a predetermined width, respectively, and the magnet rotor, which becomes the field magnetic pole, and the magnet rotor rotatably support the rotating shaft. A bearing is fixed to the fixed armature side so that the fixed The conductor part of the fan-shaped armature coil fixed to the armature surface, which is effective for output torque, is made so that the magnetic field of the magnet rotor penetrates, and the width of the conductor part on both sides is a predetermined width from the magnetic pole peak. Two fan-shaped armature coils are made small and arranged side by side along the circumferential surface at equal pitches, and are fixed to a stationary armature and have a width of 90 degrees N and S on the outer periphery of the magnet rotor. Every time the magnet rotor rotates by qO degrees, the central part of the above-mentioned conductor parts on both sides of the fan-shaped armature coil is connected to the central part of the field magnetic pole by the output of one position sensing element facing the magnetic pole. When they match, it is switched and the first . a position detection device that alternately outputs second position detection signals; It is comprised of an energization control circuit that energizes the odd-numbered armature coils and the even-numbered armature coils of the juxtaposed armature coils by the width of the position detection signal in response to the second position detection signal.

Furthermore, when the device of the present invention is installed inside a pager, a circular recess is provided inside the outer casing of the pager, and the stationary armature is inserted and fixed into the circular recess, thereby making the device of the present invention flat. The structure is such that technology can be used effectively.

[Effect]

Since the first operating axial air gap type 7-phase semiconductor motor is used, it is flat, and a part of the bottom surface of the fixed armature is buried in a circular recess in the outer casing of the pager, thereby making it more effective. Obtainable. Therefore, the first and third problems are solved.

Second Effect As will be described later in Fig. 1(b), by providing the holes u/a, 2/b in the magnet rotor S, the dead center is eliminated and self-starting is completed, and the empty By burying an object of high specific gravity such as lead in the hole 2/a, a large vibration energy can be obtained, and the electric motor serving as the vibrator can be constructed without increasing the thickness.

Therefore, there is an effect of solving the qth problem.

Third action commutator and brushes are removed, resulting in longer service life and
This also has the effect of reducing the frequency of failures.

Also, since the commutator and brushes are removed, this space can be used to mount a rotating shaft with a large diameter and its bearing. [Example] The details of the device of the present invention will be explained with reference to Figure 1 and subsequent examples. .

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

In Figure 1, symbol 3 indicates the outer casing of the pager.
The electromagnetic vibrator A according to the present invention is mounted inside it.

Other members of the pager are omitted and not shown.

When a call reception signal is generated, the electromagnetic vibrator A generates vibration, and the user can feel this vibration in a part of his body and know that there is a call. .

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

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

An armature coiler fixed on a mild steel plate (circular) 6 is embedded 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 central hole ν of the circular recess.

A rotary shaft/ is rotatably supported in the hole of the bearing/a,
The center portion of the mild steel plate 7 is fixed to the left end of the rotating shaft.

Symbol S is a magnet rotor, which is fixed to the mild steel plate 7.

FIG. 1(b) is a plan view of the magnet rotor S shown in FIG. 2(a) as viewed from the direction of arrow C.

In FIG. 2(b), a circular plastic magnet S has N, S magnetic poles 5a, 5b, 5c, 5 with a width of 90 degrees.
It is magnetized so that it becomes d.

Adjacent magnetic poles are different poles, and magnetic poles 5a and tb
A rectangular gap 2/a is provided adjacent to the gap 2/a.

In the cavity 2/a, a dot part 21 made of lead having a large specific gravity is formed.
The objects shown are filled and buried.

A void 21b on the opposite side separated by IgO degrees from the void 2/a
The gap portions 2/a and 2/b have the same shape, and a pair of adjacent 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 7, and their magnetic field penetrates the opposing armature coil q, and the magnetic path is closed by a mild steel plate B.

FIG. 2(C) is a plan view of the fixed armature 6 seen from the direction of arrow B in FIG. 2(a).

In Figure 1 (C), armature coils 4 (a, fb, 4Zc, 4'cl) 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 width of both sides (in the radial direction) is less than 90 degrees, and the printed wiring (omitted) is mounted on the top surface of the mild steel plate (O). (not shown), and necessary wiring is performed between the terminals of the energization control circuit // and each armature coil.

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

FIG. 7 shows the magnet rotor S and the armature coil 9a,
'4b,... is a developed view.

Hall element //a is N outside the magnet rotor S,
Opposed to the S magnetic pole (each magnetic pole peak is 90 degrees), the above-mentioned outer side is provided with a position detection signal output every time the magnet rotor sIJ''-90 degrees rotates in the direction of arrow G. This magnetization is performed separately from the magnetization of the magnetic poles.

The widths on both sides of the armature coils 4a, 4'b, . . . are made smaller than 90 degrees.

The armature coil 4Za and the armature coil 4Z are connected in series (or in parallel) and are energized by a positive terminal 9a and a negative terminal 9b of the DC power supply.

Armature coils qb and d are also connected, and the positive 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. 1, armature coils M and N are armature coils 4a and llc and armature coil 4(b), respectively.
, 4c shown above in series.

Symbol F indicates an electric circuit that amplifies the output of the Hall element //a. This and the transistor 16a, /7a, /? The integrated circuit containing b is the one indicated by the symbol l/ mentioned above.

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

When Hall element //a faces the north pole, transistor /Ab is energized and conductive by its position detection signal output, so that armature coil N is energized.

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

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

Curve/L2a, /,? a, /ub,... are output torque curves.

Curves /2a and /ub are torque curves corresponding to each rotational angular position when the magnet rotor S rotates 3bO degrees in the direction of arrow G from the illustrated position.
b, <za right conductor section 4 ('t+-/.

It is a torque curve due to energization of tlcl-/.

Curves /, )a and /3b are the armature coil tlb.

' This is a torque curve due to energization of the left conductor part qb-co, tI (1-2) of Jd.

The Hall element //a enters the N magnetic pole outside the magnet rotor, rotates by qO degrees, and a position detection signal with a width of 90 degrees is obtained, and the armature coils 4 (b, 4' (1) The current is energized for a width of 90 degrees, there is no position detection signal output in the next rotation of 90 degrees, and a position detection signal of a width of 90 degrees is obtained in the next rotation of 90 degrees, so the armature coils qb and +a are turned on again. qo
energization is carried out over a width of 100°C.

Therefore, output torques of curves /2a, /3a and curves /2b, /3b are obtained.

When the magnet rotor S rotates 9c 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 9a.

IIc is energized by a width of 90 degrees, and the next ? When the rotation angle is θ degrees, the energization is stopped, and during the next 90 degrees, a position detection output is obtained and the energization is turned on.

The output torque due to energization of the right conductor portion of the armature coils 9a and lIc is curved /4/a, /4'b, and the output torque due to energization of the left side conductor portion is curve 15a.

It becomes 15b.

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 10a, 10b, lOc indicate armature coils M, N
The position where the energization can be switched is shown.

The shape of the gap and armature coils 44a and 9b shown by symbols 2/a and 2/b of the magnet rotor S in FIG.

Depending on the width between both sides of..., the torque curve /:la,
/2b.

/,? a, /,? The characteristics of b, . . . also change.

For example, changing the lengths of the arrows 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 90 degree magnetic pole width, 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.

Since there is a heavy object at the point of impact of the void 2/a,
Since vibration is generated as the magnet rotor S rotates, it can provide an effective means as an electromagnetic vibrator.

Due to the presence of the voids 2/a and 21b, the dead center disappears and the output torque becomes flat, and one of the voids is filled with a heavy non-magnetic material to form a vibrator.
The novel technology of the device of the present invention is that a flat electromagnetic vibrator is constructed by taking advantage of the drawbacks of an l-phase semiconductor motor.

In the embodiment of the flute section, the dotted line 7a indicates the plastic force for protecting the rotor S. The present invention can also be implemented as an independent electric motor by fixing the right side opening of the plastic forceps 7a to the outer periphery of the mild steel plate O.

〔effect〕

First effect: As with conventional electromagnetic vibrators, the advantage is that the characteristics of the flat structure can be maintained and the shortcomings in the service life can be eliminated.

Also, electrical noise generated by the commutator and brushes can be removed.

The third effect is that the diameter of the rotating shaft and its bearing can be increased, so that the drawback of shortened service life due to damage to the rotating shaft can be eliminated.

Third effect: There is no dead center in the output torque, so self-starting is complete,
Since the torque characteristics are also flat, an electromagnetic vibrator that can obtain large vibration energy can be obtained.

Figures are shown respectively.

/, /a...rotating shaft and bearing, 3...outer casing, A.
...Electromagnetic vibrator, da, 4(a, 41b,...armature and armature coil, !;,!;a,!;b,...magnetic rotor and magnetic pole, 6,7... Mild steel plate, 7a
...Plastic cover, //, //a...IC and Hall element of the energization control circuit, 2/a, 21b...Gap area, Edge...Lead filling part, ga, gb, 9a, 9
b, 9cm DC power supply voltage negative pole, /ua, /2'o
, /Ja, /,,? b, /lIa.

ldab, /ja, 15b...torque curve, M,
N...Armature coil, F...Hall element //a amplifier circuit, /Aa, /B...transistor.

[Brief explanation of drawings]

Figure 1 is a side view of the outer casing of a pager in which the device of the present invention is used, Figure 2 (a) is a cross-sectional view of the device of the present invention, and Figures 2 (1) and (C) are similarly Figure 3 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, Figure 9 is the armature coil energization control circuit. ((L> A certain time (6) 2 drawings of sheep (C) 3 drawings of sheep

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. In a circular ring, different poles are arranged adjacently, and adjacent/pairs of N
, the opposing parts of the S magnetic poles are removed by a predetermined width, and these removed parts are filled with a heavy non-magnetic material, and the opposing parts of the adjacent N and S magnetic poles on the opposite side of the removed part are also removed in the same way. A magnet rotor serving as field magnetic poles each 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 magnetic poles of the magnet rotor. A disk-shaped magnetic disk whose center part is attached to a rotating shaft closes the magnetic path and a fan-shaped armature coil attached to a stationary armature surface, which is effective for the output torque. The width of the conductor parts on both sides is made a predetermined width smaller than the magnetic pole width so that the magnetic field of the magnet rotor penetrates through the conductor parts, and the four conductor parts are arranged side by side along the circumferential surface at equal pitches. A fan-shaped armature coil, fixed to the stationary armature, and a 90 degree width N on the outer periphery of the magnet rotor;
Due to the output of one position detection element facing the S magnetic pole, each time the magnet rotor rotates 90 degrees, the center of the conductor sections on both sides of the fan-shaped armature coil moves to the center of the field magnetic pole. It is switched when the N and S of the field magnetic poles match.
A position detection device that alternately outputs first and second position detection signals of rectangular waves with widths corresponding to the respective magnetic poles; An electromagnetic vibrator comprising an energization control circuit that energizes the armature coils and the even-numbered armature coils by the width of a position detection signal. (2) In the claim set forth in item (1), the pager is characterized in that a circular recess is provided inside the outer casing of the pager, and the stationary armature is inserted and fixed into the circular recess. An electromagnetic vibrator.