JP2001145309A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic device capable of reducing leakage flux and preventing generation of eddy current. SOLUTION: This electronic device is provided with a rotor 13 rotated by spring torque and a generator 20 formed by including a stator 21 storing the rotor 13, with the rotor magnet of the generator 20 formed out of a magnet having the maximum energy product of 120 KJ/m3 (approx. 15 MGOe) or less. Therefore, by reducing magnetic flux from the rotor magnet, it is possible to reduce a clearance between the rotor 13 and the stator hole 21a for reducing leakage flux to a magnetic member such as a base plate. Eddy current loss due to leakage flux can be restrained and increase in the rotational torque of the rotor 13 can be prevented, thus it is possible to lengthen the duration of the electronic device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to electronic equipment,
More specifically, the present invention relates to an electronic device having a mechanical energy source and a generator driven by the mechanical energy source and generating induced power to output electrical energy.

[0002]

BACKGROUND ART Conventionally, a generator for converting mechanical energy stored in a mainspring or the like into electric energy, a supply unit for supplying electric power generated by the generator to the outside,
There is known a power generation device (electronic device) including a control unit that mechanically controls the rotation speed of the generator by using a voltage from the supply unit (see Japanese Patent Application Laid-Open No. 8-75874).

[0003] Further, mechanical energy when the spring is released is transmitted to a generator via a speed increasing gear train, and the generator converts the mechanical energy into electric energy. There is known an electronically controlled mechanical timepiece that controls the value of current flowing through a coil to accurately move a pointer fixed to a wheel train and accurately display time (see Japanese Patent Application Laid-Open No. H8-5758). ).

[0004] By the way, electronic equipment such as an electronically controlled mechanical timepiece and a power generator are the same as those conventionally used in a stepper motor of a quartz timepiece or an automatic winding power generation mechanism in which a rotor of a generator is rotated by a rotating weight. Magnets are used. In other words, conventional step motors and rotors of self-winding power generating mechanisms use high energy product magnets in order to reduce inertia, and similar high energy product magnets are used in electronically controlled mechanical watches. Was.

At this time, the smaller the space (gap) between the rotor magnet and the stator hole, the smaller the leakage flux, but the larger the cogging torque. In the self-winding power generating mechanism using the rotating weight, there was no problem even if the cogging torque was slightly large because the rotating torque was large.However, in an electronically controlled mechanical timepiece, mechanical energy such as a mainspring was used at an increased speed. Therefore, the rotational torque is small and the cogging torque needs to be reduced.

For this reason, in the conventional electronically controlled mechanical timepiece, the gap between the rotor magnet and the stator hole is increased to reduce the cogging torque.

[0007]

However, if the gap is large, a part of the magnetic flux generated by the rotor magnet is likely to become a leakage magnetic flux, and the magnetic flux is linked to a magnetic member disposed around the rotor and the stator, thereby causing an eddy current loss. There was a problem that causes.

In particular, in electronic devices such as watches and the like, there are many metal parts plated with nickel (magnetic material) for the purpose of preventing rust. The eddy current loss has been caused by the magnetic flux and the magnetic material interlinking the metal parts and the metal parts.

When an eddy current is generated, the magnetic field generated by the current affects the rotor magnet, so that the rotational torque of the rotor is increased and the duration of the timepiece is reduced accordingly.

In order to reduce the influence of the magnetic flux leakage, it is conceivable to separate various magnetic members from the rotor magnet. In this case, however, the thickness of the timepiece is reduced by increasing the distance between the rotor magnet and the magnetic members. There is a problem that it becomes large.

Moreover, such a problem is not limited to an electronically controlled mechanical timepiece, but also to an electronic device or a power generating device having a power generating unit for transmitting power to a generator by using a mechanical energy source such as a mainspring. Had occurred.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electronic device capable of reducing leakage magnetic flux and suppressing eddy current loss caused by the leakage magnetic flux.

[0013]

An electronic device according to the present invention includes a mechanical energy source, and a generator driven by the mechanical energy source to generate induced power and supply electrical energy. , The maximum energy product (BHmax) is 120 k as a rotor magnet of the generator.
J / m ³ (approximately 15 MGOe in terms of a gravitational unit; hereinafter, similarly, a converted value in a unit of weight is described in parentheses). here,
H is the strength of the magnetic field, and B is the magnetic flux density.

In realizing such an electronic device, the power generation capacity required for the electronic device is determined by the conditions under which the electronic device is used or the performance of a product in which the electronic device is incorporated. For example, when this electronic device is used in a watch or the like, the power generation required for the electronic device depends on the amount of power generation corresponding to the power required to drive a control circuit for controlling the rotation of the rotor and the capability of the boosting / rectifying circuit. The voltage is determined. There are several parameters to determine this electromotive voltage. Among these parameters, the number of turns of the coil and the frequency of the rotor are determined by the size and duration of the movement (machine body) and the amount of energy stored in a mechanical energy source (such as a mainspring). For this reason, the number of interlinkage magnetic fluxes Φ to be secured for generating the electromotive voltage required for the electronic device is also determined.

For example, when it is necessary to secure Φ = 0.14 μWb as the number of coil linkage magnetic fluxes, for example, a high energy product magnet (BHmax = 256 kJ)
/ M ³ ≒ 32MGOe) When a magnetic material of R32H is used for the rotor, the diameter 2r of the rotor, the inner diameter (diameter) 2R of the stator hole accommodating the rotor, and the gap G1 between the stator and the rotor magnet are as shown in the following table. Results. At this time, the thickness of the rotor magnet is 0.4 mm, and the thickness of the stator is set to 0.5 mm.

[0016]

[Table 1]

According to Table 1 above, the smaller the inner diameter of the stator hole, the smaller the gap between the rotor and the stator hole, and the more the leakage flux to the magnetic member provided around the rotor. This is desirable because it is possible to reduce However, when the number of coil linkage magnetic fluxes Φ is the same, when the inner diameter of the stator hole is reduced, the density of the magnetic flux that attempts to enter (link) the stator hole increases. When the magnetic flux density is increased in this way, iron loss such as hysteresis loss and eddy current loss proportional to the square of the magnetic flux density increases. This increases the torque required to rotate the rotor and reduces the duration. Therefore, in order to reduce iron loss, it is preferable to make the stator hole diameter as large as possible.

On the other hand, when the inner diameter of the stator hole is increased,
Since the gap becomes large, the leakage magnetic flux leaking from the gap to the surrounding magnetic members increases. Then, a part of such a leakage magnetic flux links with a metal part or the like, and an eddy current loss occurs. That is, the gap may be reduced to reduce the eddy current loss.

Therefore, when a magnet having a maximum energy product as low as 120 kJ / m ³ (about 15 MGOe) or less is used as in the present invention, for example, the stator hole can be moved in size (outer size of a machine body including a rotor and the like). When the size is increased within the allowable range, the diameter of the rotor magnet can be increased when the same number of coil interlinkage magnetic fluxes is secured as compared with the case where a conventional magnet having a high energy product is used. This allows
The gap can be reduced to reduce the leakage flux. For this reason, it is possible to reduce the iron loss by increasing the diameter of the stator hole, and to reduce the gap by increasing the diameter of the rotor magnet, thereby suppressing the eddy current loss. Can be. For this reason, if the same mainspring is used as the mechanical energy source, the duration of the electronic device can be extended, and if the same duration is used, a smaller mainspring can be used. The electronic device can be reduced in size and weight.

At this time, it is more preferable to use a rotor magnet having a maximum energy product of 80 kJ / m ³ (about 10 MGOe) or less, since the gap can be further reduced.

However, as shown in FIG. 6, if the maximum energy product of the rotor magnet is less than 8 kJ / m ³ (about 1 MGOe) and the holding force is less than 8 kA / m (about 100 Oe), the required linkage will occur. Magnetic flux may not be obtained. Therefore, the maximum energy product is preferably 8 kJ / m ³ (about 1 MGOe) or more, and the holding force is 8 kA / m (about 10 MGOe).
0 Oe) or more, and more specifically, may be set in consideration of the characteristics of various magnets to be used.

The rotor magnet has a coercive force of 16 k.
It is preferable that the magnet be A / m (about 200 Oe) or more. As shown in FIG. 6, the holding force of the rotor magnet is 16 kA.
/ M (about 200 Oe) or more, the fluctuation of the magnetic flux density B can be made smaller than the fluctuation of the permeance coefficient caused by the fluctuation of the outer dimensions of the magnet. For this reason,
Even if there is some variation in the dimensions of the rotor magnet, the variation in the number of interlinkage magnetic fluxes can be reduced, so that the number of interlinkage magnetic fluxes for obtaining a required power generation amount can be secured. Therefore, manufacture of the rotor magnet can be facilitated.

Here, it is preferable that the rotor magnet is an isotropic magnet.

Since the isotropic magnet has a smaller maximum energy product than the anisotropic magnet, the cogging torque is smaller than in the case where the anisotropic magnet is used, and the gap can be reduced accordingly. Further, eddy current loss due to leakage magnetic flux can be further reduced.

Furthermore, unlike the anisotropic magnet, the magnetization direction is not limited, so that stable magnetization is possible and the rotor magnet can be magnetized with the rotor magnet incorporated in the movement. Equipment can be easily manufactured.

Further, it is preferable that the rotor magnet is an alnico magnet, a ferrite magnet or an iron-chromium-cobalt magnet.

Alnico magnets and iron-chromium-cobalt magnets have small variations in performance (magnetic flux density) with respect to temperature changes. Therefore, use them in various places with different temperatures, for example, in cold regions, tropical regions, and highlands. Can be. For this reason, the electronic device of the present invention using an alnico magnet or an iron-chromium-cobalt magnet can be used, for example, at a temperature below 10 ° C.
To about 60 ° C.

On the other hand, ferrite magnets are inferior in temperature characteristics to alnico magnets, but are inexpensive and widely used because they are made of easily available magnetite. Therefore, the raw material cost of the rotor magnet can be reduced, and the cost of the electronic device can be reduced.

Preferably, the thickness of the rotor magnet is at least 0.4 times and at most 0.8 times the thickness of the stator of the generator.

With respect to the thickness of the rotor magnet, the inventor has experimented with an optimum thickness range that the rotor magnet should have based on various conditions such as the rotational state of the rotor, the number of flux linkages to the stator, and stable power generation. Sought to do.

As a result, when the thickness of the rotor magnet is 0.8 times or less the thickness of the stator, the leakage flux from the rotor magnet can be reduced more effectively than when the thickness is larger than 0.8 times. Could be reduced. Further, since the thickness of the rotor magnet is smaller than that of the stator, the distance (the distance in the thickness direction of the rotor magnet) to the magnetic member disposed around the generator can be increased, and the vortex due to the leakage magnetic flux can be increased accordingly. Current loss can be reduced. In addition, when the distance between the rotor magnet and the magnetic member is the same as that in the related art, the magnetic member can be closer to the rotor magnet than in the related art, and the electronic device can be made thinner.

On the other hand, if the thickness of the rotor magnet is to be suppressed to less than 0.4 times the thickness of the stator, the rotor magnet must be machined very thinly, which increases the machining cost and increases the cost of the rotor magnet. In addition, the floating force of the rotor due to the magnetic force acting between the stator and the rotor becomes small, and the rotor tenon rotates while being in contact with the bearing, so that the friction loss increases. As a result, an increase in friction loss can be prevented. Therefore, by making the thickness of the rotor magnet 0.4 times or more and 0.8 times or less the thickness of the stator, it is possible to suppress eddy current loss and friction loss while suppressing the manufacturing cost of the rotor magnet.

Preferably, the rotor bearing for accommodating the tenon attached to the rotor is a vibration-proof bearing.

In the present invention, by using a magnet having a relatively small energy product for the rotor magnet, the diameter of the rotor magnet can be increased and the gap with the stator hole can be reduced. For this reason, the volume of the rotor magnet increases, the weight also increases, and the impact applied to the rotor when the electronic device falls or the like may increase. At this time, if the rotor bearing for accommodating the tenon attached to the rotor is a vibration-proof bearing, it is possible to prevent the tenon from being broken by an impact at the time of drop.

Preferably, the electronic device is a power generating device having a power supply terminal or the like and configured to be able to supply power generated by the power generator to the outside. According to such a power generator, since the duration is long, a power generator that can be used for a long time can be provided.

Also, the electronic device is driven by electric energy supplied from the generator to control a rotation cycle of the generator, and a mechanical energy source of the electronic device together with the generator. The electronic timepiece may be an electronically controlled mechanical timepiece having a pointer that is rotated and controlled by the rotation control device.

According to such an electronically controlled mechanical timepiece,
Since leakage flux can be reduced and eddy current loss can be reduced,
The power generation efficiency can be improved and the duration can be prolonged.

Further, even if the magnetic components are arranged closer to the rotor magnet than before, the influence on the duration can be reduced, and the movement (machine, unit), that is, the electronically controlled mechanical timepiece can be made thinner.

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view schematically showing an electronically controlled mechanical timepiece incorporating an electronic device according to the present embodiment.
3 is a cross-sectional view of the main part, and FIG. 4 is an enlarged cross-sectional view of the main part. 1 to 3, the electronically controlled mechanical timepiece includes a barrel wheel 1 including a mainspring 1a, a barrel gear 1b, a barrel barrel 1c, and a barrel lid 1d. The outer end of the mainspring 1a is fixed to the barrel gear 1b, and the inner end is fixed to the barrel barrel 1c. The barrel true 1c is formed into a tubular shape and is inserted and supported by the support member 2, so that the barrel true 1c rotates integrally with the square wheel 4 disposed between the barrel wheel 1 and the main plate 3, and is screwed to the support member 2. It is held down by a square hole screw 5 so as not to come out upward in the figure.

The rotation of the barrel gear 1b is transmitted to the second wheel & pinion 6 and then increased in speed to the third wheel & pinion 7 (FIG. 1). (Intermediate wheel) 9, the speed is further increased, and transmitted to the fourth wheel 10, the fifth wheel 11, the sixth wheel 12, and the rotor 13. The center pinion 6a is fixed to the second wheel & pinion 6; the minute hand 6b is fixed to the center pinion 6a; and the second hand 8a is fixed to the second hand wheel 8.

The second and fifth wheels 6, 11 have a second bridge 15 at the top.
The lower part is supported by the main plate 3, and the third, fourth and sixth wheel wheels 7, 1
The upper wheels 0 and 12 and the rotor 13 are supported by the train wheel bridge 14 and the lower portion thereof are supported by the main plate 3. I have. A dial 17 is disposed outside the lower surface of the main plate 3 (lower side in the figure).
An anti-magnetic plate 18 made of a magnetic material such as an amorphous material is interposed between the base plate 7 and the base plate 3.

This electronically controlled mechanical timepiece has a rotor 13,
A generator 20 including a stator 21, a first coil block 22, a second coil block 23, and a joint 24
It has. The rotor 13 is, as shown in FIG.
A rotor magnet 13a, a rotor pinion 13b, and a rotor inertial disk 13c are provided, and the rotor magnet 13a is fixed to the inner peripheral surface of a holding portion 13f made of a non-magnetic material by bonding or the like. The rotor inertia disk 13 c is provided for reducing the rotation speed fluctuation of the rotor 13 with respect to the driving torque fluctuation from the barrel car 1. The stator 21 forms a part of a magnetic circuit of the generator 20, and has an arrangement hole (stator hole) 21a in which the rotor magnet 13a is arranged.
The magnetic flux of the rotor 13 is linked. The first and second coil blocks 22 and 23 include magnetic cores 22a and 2
A coil is wound around 3a. Here, the stator 21, the magnetic cores 22a and 23a, and the joint 24 are made of PC permalloy or the like.

In FIG. 4, the base plate 3, the sixth wheel & pinion 12, and the dial 17 have a surface treatment layer 3 made of nickel plating on the surface.
a, 12a, and 17a are formed of a magnetic material, and the components of a bearing unit (rotor bearing) 19 that supports the rotor inertia disk 13c and the rotor 13 are made of brass, ruby, or synthetic resin that is not plated with nickel. And the like. The bearing unit 19 receives the rotor 1 by an impact when the electronically controlled mechanical watch falls.
A vibration-proof bearing for preventing the tenon 13g at the tip of the third shaft from being damaged is provided. Specifically, the anti-vibration bearing includes the rotor 1
A pit stone 19a for accommodating 13g of tenon mortise,
a, and a seat 19c formed with a conical slope that abuts the conical outer peripheral portion of the frame 19b.
And a stone 19d that is arranged outside the hole stone 19a and is supported by the frame 19b, and a spring 19e that is attached to the seat 19c and presses the stone 19d.

Then, the electronically controlled mechanical clock falls,
When an impact that causes the rotor 13 to be displaced in the axial direction is applied, the shaft of the rotor 13 comes into contact with the receiving stone 19d, and the force is absorbed by the spring 19e. Further, when the shaft of the rotor 13 moves, the shoulder of the shaft comes into contact with the seat 19c to absorb the impact. Also, the electronically controlled mechanical clock falls and the rotor 13
When an impact is applied in a direction perpendicular to the axis of
When the displacement of the 3 tenon 13g is transmitted to the pit stone 19a,
The frame 19b for accommodating the pit stone 19a slides along the conical slope of the seat 19c, and the force is applied via the receiving stone 19d.
It is absorbed by the spring 19e. Therefore, even if an impact is applied to the rotor 13, the impact is absorbed by such an anti-vibration bearing.

The rotor magnet 13a, the main plate 3, and the sixth wheel & pinion 1
2. The distance L between the dial 17 and the anti-magnetic plate 18
1, L2, L3, and L4 are at least 1.5 times the gap G1 between the rotor magnet 13a and the stator 21 (specifically, the inner peripheral surface of the arrangement hole 21a).
1) More preferably, it is set to be twice or more to reduce the leakage magnetic flux linked with the main plate 3, the sixth wheel & pinion 12, and the dial 17. The thickness H1 of the rotor magnet 13a is 0.4 to 0.8 times the thickness H2 of the stator 21 (H1 = H1 = H2).
0.4 to 0.8 × H2), which also reduces the leakage magnetic flux.

In this embodiment, the rotor magnet 13a is
And the maximum energy product is 120 kJ / m ^Three(About 15MGO
e) The following magnets are used. Specifically, the coercive force
Is 80 kA / m (about 1000 Oe) or more and isotropic
Alnico magnets are used.

In the electronically controlled mechanical timepiece, the power consumed by the control circuit need only be generated by the generator 20, and the rotor 13 of the generator 20 also rotates at a constant speed. Any amount that can generate power that can supply the circuit may be used. Therefore, the maximum energy product is 120 kJ / m ³ (about 15 MG
Oe) Even if the following magnet is used as the rotor magnet 13a,
A necessary and sufficient number of interlinkage magnetic fluxes can be obtained.

In the above electronically controlled mechanical timepiece, the generator 2
AC output from 0 is boost rectification, full-wave rectification, half-wave rectification,
The voltage is boosted and rectified through a rectifier circuit such as a transistor rectifier, charged in a smoothing capacitor, and a control circuit (not shown) for controlling the rotation of the generator 20 with the power from the capacitor is operated. The control circuit includes an integrated circuit (IC) including an oscillation circuit, a frequency dividing circuit, a rotation detection circuit, a rotation speed comparison circuit, an electromagnetic brake control unit, and the like, and a quartz oscillator is used for the oscillation circuit.

Further, the square wheel 4 is rotated to rotate the mainspring 1a.
Is carried out by operating a winding stem 30 connected to a crown (not shown), through a center wheel 31, a round wheel 32, and a square hole intermediate wheel 33. At this time, the rotation of the square wheel 4 The direction is regulated by the kohaze 4a. The minute hand 6b
The method of adjusting the hour hand is performed in the same manner by operating the winding stem 30, and through a stud wheel 34, a small iron wheel 35, an intermediate minute wheel 36, and a minute wheel 37. At this time, the driving system is The control lever 38 stops when it comes into contact with the fifth wheel & pinion 11. Since these mechanisms are the same as a well-known automatic or manual winding mechanism of a mechanical timepiece, further detailed description is omitted.

According to this embodiment, the following effects can be obtained.

(1) The maximum energy product (BHmax) is 12
By using a magnet having a relatively small energy product of 0 kJ / m ³ (about 15 MGOe) or less, the magnetic flux generated from the rotor magnet 13a can be reduced. For this reason, since the cogging torque can be reduced, the diameter of the rotor 13 (rotor magnet 13a) is increased as compared with the related art, and the gap (gap G1) between the rotor magnet 13a and the arrangement hole (stator hole) 21a is increased. The eddy current loss can be reduced by suppressing the leakage magnetic flux to the magnetic member. Therefore, since an increase in the rotational torque of the rotor 13 can be suppressed, the power generation efficiency can be improved.

For this reason, if the same mainspring 1a as the conventional one is used as the mechanical energy source, the duration of the electronically controlled mechanical timepiece can be made longer. A small mainspring can be used, and the electronically controlled mechanical timepiece can be reduced in size and weight.

(2) Further, since the isotropic magnet having a smaller maximum energy product than the anisotropic magnet is used, the cogging torque can be reduced as compared with the case where the anisotropic magnet is used, and the gap G1 can be reduced. Since it can be made smaller, the leakage flux can be further reduced.

(3) The gap G1 is reduced by using the rotor magnet 13a having a smaller maximum energy product than the conventional one,
Since the leakage magnetic flux is reduced, even if a magnetic component plated with nickel or the like is arranged closer to the rotor magnet 13a than before, the influence on the duration can be reduced, and the movement (machine body, unit) Can be made thinner. For this reason, a thinner electronically controlled mechanical timepiece than before can be formed.

(4) Conventionally, the base plate 3, the train wheel bridge 14, and the dial 17 which were not plated in consideration of the eddy current loss
The parts can be plated to improve the aesthetics of the movement and the rust prevention effect.

(5) Since the isotropic magnet is used as the rotor magnet 13a, the magnetization direction is not limited unlike the anisotropic magnet, so that stable magnetization is possible and the rotor magnet Since the magnet 13a can be magnetized while being incorporated in the movement, an electronically controlled mechanical timepiece can be easily manufactured.

(6) The coercive force is 80 kA / m (about 1000 O
e) Since the magnet 13a as large as above is used, the magnet 1
Fluctuations in the magnetic flux density B can be reduced with respect to fluctuations in the permeance coefficient caused by variations in the outer dimensions of 3a. For this reason, even if the size of the rotor magnet 13a is slightly varied, the variation of the number of interlinkage magnetic fluxes can be reduced, and the number of interlinkage magnetic fluxes for obtaining a required power generation amount can be secured. Therefore, manufacture of the rotor magnet 13a can be facilitated.

(7) As the rotor magnet 13a, an alnico magnet or an iron-chromium-cobalt magnet having a small change in magnetic characteristics with respect to temperature is used.
Performance can be maintained. That is, examples of magnets having a maximum energy product of 120 kJ / m ³ (about 15 MGOe) or less include ferrite magnets in addition to alnico magnets and iron / chromium / cobalt magnets. However, as shown in Table 2 below, ferrite magnets have a temperature coefficient of residual magnetic flux density of -0.18% / ° C.
When the temperature changes to 0 ° C., the residual magnetic flux density Br decreases by 7.2%. In contrast, Alnico magnets have a temperature coefficient of residual magnetic flux density of -0.02 to -0.032% / ° C and a temperature of 20 ° C.
Magnetic flux density Br when the temperature changes from
To 1.3%. In addition, iron
For chromium-cobalt magnets, the temperature coefficient of the residual magnetic flux density is -0.03 to -0.05%, and the residual magnetic flux density Br for a temperature change from 20 ° C to 60 ° C can be reduced to 1.2 to 2.0%. it can. The residual magnetic flux density of such an alnico magnet or iron / chromium / cobalt magnet with respect to temperature change is almost the same as that of a samarium / cobalt magnet or a neodymium magnet having a large maximum energy product. By using the cobalt magnet, the electronically controlled mechanical timepiece can be used stably even in a wide temperature range, that is, various conditions having different temperatures such as a cold region to a tropical region.

[0060]

[Table 2]

(8) Further, since the alnico magnet containing nickel or the like has high hardness and can be ground, the shape and dimensions of the rotor magnet 13a can be made exactly as designed.

(9) Since the thickness of the rotor magnet 13a is 0.4 to 0.8 times the thickness H2 of the stator 21, the distance to the magnetic member can be increased.
Generation of leakage magnetic flux from the rotor magnet 13a to the surrounding magnetic member can be suppressed, and generation of eddy current loss can also be suppressed. When the distance between the rotor magnet 13a and the magnetic member is set to be the same as that of the related art, the magnetic member is set to be smaller than that of the related art.
3a, and the electronically controlled mechanical timepiece can be made thinner.

Further, a sufficient floating force can be obtained, so that an increase in friction loss at the bearing portion can be prevented.

(10) Maximum energy product is 120 kJ / m
³ (about 15 MGOe) or less, so that the volume of the rotor magnet 13a becomes larger and the inertia of the rotor 13 becomes larger than before, so that the rotation stability can be improved. In the electronically controlled mechanical timepiece, a rotor inertia disk 13c is provided to increase the inertia of the rotor 13 because it is necessary to rotate the rotor 13 at a low speed and a constant speed. However, in the present embodiment, the volume of the rotor magnet 13a is further reduced. The increased inertia can increase the inertia and improve the rotational stability.

(11) Since an anti-vibration bearing is used for the bearing unit 19, even if the electronically controlled mechanical timepiece whose weight is increased due to the increase in the diameter of the rotor magnet 13a is dropped, the tenon mortise 13g is broken by the impact. Can be prevented.

It should be noted that the present invention is not limited to the above embodiments, but includes other configurations capable of achieving the object of the present invention, and the following modifications are also included in the present invention.

For example, in the above embodiment, the rotor magnet 1
Although the outer peripheral surface and the upper surface of 3a are covered with the holding portion 13f, only the surface (that is, the outer peripheral surface) of the rotor magnet 13a facing the stator 21 (FIG. 4) may be covered with a cover material. It may be fixed to the shaft portion by bonding or the like. Further, this cover material 13d is attached to the rotor magnet 13a.
And a notch portion facing each other at a position corresponding to the boundary between the N pole and the S pole of the rotor magnet 13a. The notch portion saturates the magnetic flux in the cover material 13d. You may.

The bearing unit 19 includes
Although the anti-vibration bearing using 9d and the spring 19e has been used, other anti-vibration bearings may be used. Further, the bearing is not limited to a vibration-proof bearing, and a normal combination bearing or the like may be employed.

Further, the thickness dimension of the rotor magnet 13a is
The thickness is not limited to 0.4 to 0.8 times the thickness dimension H2 of the stator 21 and may be, for example, 0.4 times or less or 0.8 times or more.

Further, the rotor magnet 13a is not limited to one having a coercive force of 80 kA / m (about 1000 Oe) or more, and may have a coercive force of less than 80 kA / m (about 1000 Oe). In short, the rotor magnet of the present invention only needs to have a maximum energy product of 120 kJ / m ³ (about 15 MGOe) or less.

As the rotor magnet 13a, an anisotropic magnet may be used in addition to the isotropic magnet.

Although an alnico magnet is used as the rotor magnet 13a, a ferrite magnet, a bond magnet, or the like may be used. In particular, when the condition (temperature characteristic) that the influence of magnetism on the temperature change is small as described above is not required, for example, in the case of a toy or indoor use, a ferrite magnet can be used as the rotor magnet 13a to reduce the cost.

In the case where a ferrite magnet is used as the rotor magnet 13a of an electronic device sensitive to a change in temperature characteristics such as a timepiece due to cost restrictions or the like, a larger rotor is used to compensate for the performance decrease due to the temperature change. Preferably, it is a magnet. At this time, the pulling torque (cogging torque) of the rotor 13 increases due to the increase in the outer dimensions of the rotor magnet.
It may be dealt with by providing an inner notch or the like.

The rotor magnet 13a is not limited to a two-pole rotor magnet, but may be a multi-pole rotor magnet.

Further, the electronic device of the present invention is not limited to an electronically controlled mechanical timepiece. For example, in addition to wrist watches, various clocks such as table clocks and clocks, portable watches, portable blood pressure monitors, portable telephones, pagers, pedometers, calculators, portable personal computers, electronic organizers, portable radios, music boxes, It can also be applied to metronomes, electric razors, and the like.

The present invention may be applied to a power supply device (power generator) provided with a secondary battery or a capacitor for storing the generated power and a terminal for outputting the stored power. Further, application to an electronic device or the like in which such a power generator is incorporated is also possible. In particular, it can be applied to portable radios and pedometers, taking advantage of its small size and no need for a primary battery.

Further, the mechanical energy source is not limited to the mainspring, but may be rubber, spring, weight, etc., and may be set as appropriate according to the object to which the present invention is applied.

The energy transmission device for transmitting mechanical energy from a mechanical energy source such as a mainspring to the generator is not limited to the wheel train (gear) as in the above embodiment, but may be a friction wheel, a belt and a pulley. , A chain and a sprocket wheel, a rack and a pinion, a cam, and the like may be used, and may be appropriately set according to the type of electronic device to which the present invention is applied.

When it is not necessary to rotate the generator at a constant speed as in the case of an electronically controlled mechanical timepiece, for example, when it is used as a power supply, the rotation speed of the rotor 13 is controlled by the rotation control device depending on, for example, the load condition. May be changed appropriately, or the speed of the generator rotor may not be controlled without providing a rotation control device. Even when the speed of the rotor is not controlled, the energy of the mechanical energy source can be stored in the form of electrical energy in a secondary battery or the like, so that an electronic device with a long duration can be provided.

[Example] Next, an example performed to confirm the effect of the present invention will be described.

In this embodiment, BHm shown in Table 3 below is used.
three types of magnets (cast Alnico) having an ax of 120 kJ / m ³ (about 15 MGOe) or less, and 120 kJ / m ³ (about 1 MGOe)
When five types of magnets (samarium / cobalt magnets) larger than 5MGOe) are used and the number of interlinkage magnetic fluxes, the diameter of the stator hole, the thickness of the stator, and the thickness of the magnets are the same, the distance between the rotor magnet 13a and the stator 21 is reduced. This is the length of the gap G1.

[0082]

[Table 3] Specifically, when the inner diameter of the stator hole is 3 mm, the thickness of the stator plate is 0.5 mm, and the thickness of the magnet is 0.4 mm, the number of magnetic fluxes interlinking the stator is 0.14 μWb. Thus, the outer diameter of the rotor magnet 13a, that is, the dimension of the gap is obtained.

FIG. 5 is a graph showing the relationship between each magnet (BHmax) and the gap G1. As shown in FIG. 5, the gap G1 could be reduced by using a magnet having a small maximum energy product. In addition, the gap G1 has a large change at a BHmax of about 120 kJ / m ³ (about 15 MGOe), and a BHmax of 120 kJ / m ³ (about 15 MGOe).
Oe) If the following magnets are used, the size of the gap G1 can be significantly reduced in order to obtain the same number of interlinkage magnetic fluxes, thereby reducing the leakage flux and the eddy current loss. It could be confirmed.

[0084]

As described above, according to the present invention,
Maximum energy product is 120 kJ / m ³ (about 15 MGOe)
Since the following magnets are used for the rotor magnet, the magnetic flux generated from the rotor magnet can be reduced, the gap between the rotor and the stator hole can be reduced, and the rotor magnet can be used for magnetic members such as the base plate and the dial. Magnetic flux leaked from the wire.

Therefore, the eddy current loss due to the leakage magnetic flux can be suppressed, and the increase in the rotational torque of the rotor can be suppressed, so that the duration of the electronic device can be extended.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing an electronically controlled mechanical timepiece according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the embodiment.

FIG. 3 is a sectional view of another main part of the embodiment.

FIG. 4 is an enlarged sectional view showing the main part.

FIG. 5 is a graph showing a relationship between various magnets having different maximum energy products and gaps in the example.

FIG. 6 is a graph showing an example of a demagnetization characteristic curve of a magnet.

[Explanation of symbols]

 Reference Signs List 1 barrel box 1a mainspring 3 main plate 13 rotor 13a rotor magnet 13c rotor inertial disk 13d cover material 13g tenon 14 wheel train holder 15 second catch 17 dial plate 18 magnetic-resistant plate 19 bearing unit (rotor bearing) 19a hole stone 19b frame 19c seat 19d Receiving stone 19e Spring 20 Generator 21 Stator 21a Arrangement hole (stator hole) G1 Gap L1 to L4 Distance dimension H1, H2 Thickness dimension

Continued on the front page F-term (reference) 2F001 AA00 AA01 AA02 AA05 AA07 AB01 AB02 AD01 AG05 AG07 AG13 AH06 AH07 AH10 2F084 AA07 BB01 BB09 CC03 GG02 GG04 JJ05 JJ07 LL01 LL02 5H621 AA02 GA02 GA07K01 J02 J02 DD01 DD02 DD03 DD04 DD06 PP19 PP20

Claims (8)

[Claims] 1. An electronic device comprising: a mechanical energy source; and a generator driven by the mechanical energy source to generate induced power and supply electric energy, wherein a maximum of a rotor magnet of the generator is maximum. Energy product is 12
An electronic device, wherein a magnet of 0 kJ / m ³ or less is used. 2. The electronic device according to claim 1, wherein the rotor magnet is a magnet having a coercive force of 8 kA / m or more. 3. The electronic device according to claim 1, wherein the rotor magnet is an isotropic magnet. 4. The electronic device according to claim 1, wherein the rotor magnet is an alnico magnet, a ferrite magnet, or an iron-chromium-cobalt magnet. 5. The electronic device according to claim 1, wherein a thickness of the rotor magnet is 0.4 times or more and 0.8 times a thickness of a stator of the generator. An electronic device characterized by the following. 6. The electronic device according to claim 1, wherein the rotor bearing for accommodating the tenon attached to the rotor is a vibration-proof bearing. 7. The electronic device according to claim 1, wherein the electronic device is a power generation device configured to be able to supply electric power generated by the generator to the outside. 8. The electronic device according to claim 1, wherein the electronic device is driven by electric energy supplied from the generator to control a rotation cycle of the generator, and the electronic device includes: An electronic device comprising: an electronically controlled mechanical timepiece that is rotated together with a generator by a mechanical energy source of the device and includes a pointer that is controlled by the rotation control device.