JPS61293143A - Electronic watch with generating set - Google Patents

Abstract

PURPOSE:To enhance the generative efficiency of a generating set, by winding up a coil with coil winding diameter set by the coil size of a generating set for a watch. CONSTITUTION:So far as an automatic generating set utilizing the movement of a wrist or gravity is concerned, the winding volume of a coil is set to be 20mm<3> or more at least, and between the winding diameter d(mm) of the coil and the winding volume Vc(mm<3>) of the coil, the relation 800<=Vc/alpha<=1,800 holds. As the result of the relation, the generating performance of the generating set can be utilized to the limit, and for example, even if an electronic watch is portably used by a person of little movement, a current value which is sufficient for the watch to be driven can be generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to coil winding specifications for a power generating device in an electronic wristwatch with a power generating device that converts mechanical energy into electrical energy.

[Summary of the invention]

The present invention relates to a coil winding specification for a power generation device that converts mechanical energy obtained from a rotating weight using arm movement or gravity into electrical energy through relative motion between a magnet rotor and a coil. be at least 20 mm2 or more, and the winding diameter d (tt
The relationship between an) and the coil winding volume VC(關) is 8
By setting the voltage so that 00≦V c /d≦1800, the energy conversion efficiency of the power generation device is increased and it is possible to supply sufficient electrical energy to drive the electronic wristwatch.

[Conventional technology]

The conventional electronic wristwatch with a power generation device is disclosed in Japanese Patent Application Laid-Open No. 52-8248.
As described in Publication No. 0, a rotary weight is rotated using arm movement or gravity, and the rotational speed of this rotary weight is increased to rotate a magnet rotor. 2. Description of the Related Art Electronic wristwatches equipped with a power generator that charge a secondary power source with electrical energy generated in a coil wound around a surrounding stator are known. Also, there is enough power to drive an electronic wristwatch! In order to obtain the It flow, it has been proposed that the number of turns of the coil be at least 5000 turns [
Problems and Objectives to be Solved by the Invention] However, in the prior art described above, it is said that sufficient generated current to drive an electronic wristwatch can be obtained by winding the coil 6000 times or more; Simply increasing the number of coil turns does not produce enough current to drive an electronic wristwatch. It is true that the voltage induced in the coil becomes flat when the number of coil turns is increased, but the generated tlf and current are determined from the voltage induced in this coil and the impedance of the charging circuit including the coil resistance.

Coil resistance is proportional to the length of the coil winding and inversely proportional to the cross-sectional area of the coil winding. Therefore, if a large number of thin coil wires are wound, even if a voltage is induced in the coil due to the interaction between the magnet rotor and the coil, the coil resistance will be very high, resulting in a current value sufficient to drive an electronic wristwatch. can't get it. Also, if you wind a large number of thick coil wires, the coil resistance will not increase and you will be able to obtain a current value sufficient to drive an electronic wristwatch, but the coil will become larger and the electronic wristwatch with a generator will become larger. The problem is that the

SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and its purpose is to provide a compact generator for an electronic wristwatch by maximizing the power generation efficiency of a power generator.

[Means to solve the problem]

In order to solve the above problems, in the present invention, in a power generation device that automatically generates electricity using arm movement or gravity, the winding volume of the coil is at least 20 mm2 or more, and the winding diameter of the coil is d(m+). and the winding volume of the coil VC
(d) is characterized by having a relationship of 800≦V c /d≦1800.

[Effect]

According to the above configuration of the present invention, the power generation efficiency of the membrane power generation device can be maximized by winding the coil with a diameter set according to the coil size of the wristwatch power generation device.

〔Example〕

FIG. 1 is a schematic plan view showing one embodiment of the present invention. A rotating weight 2 is attached to a clock movement 1.

3 is its center of rotation, and as shown in the figure, the center of gravity of the rotary weight 2 and the center of rotation 3 are shaped to be largely shifted from each other.

Therefore, when the entire system moves, the rotating weight 2 rotates due to the action of gravity. This rotation is increased in speed by a gear 4 attached to a weight and an intermediate gear 5, and is transmitted to a magnet rotor 6. A stator 7 made of a high magnetic permeability material is arranged around the magnet rotor 6, and a coil 8 is wound around the central part. With the above configuration, when the rotating weight 2 rotates using arm movement or gravity, this rotation is accelerated and transmitted to the magnet rotor 6.
When the magnet rotor 6 rotates, a magnetic flux that changes according to the rotation of the magnet rotor 6 is induced in the stator 7. This change in magnetic flux induces a voltage in the coil 8, and the mechanical energy of the rotating weight 2 is converted into electrical energy. The electrical energy generated in the coil 8 is transferred to the charging control circuit 2 as shown in FIG.
0 to charge the secondary power source 21.

22 is a clock mechanism including an electronic circuit.

Now, in an actual mobile phone, the rotational speed of a rotating weight is approximately 1 r, p, s unless you do intense exercise. Further, the torque of a rotating weight used in an electronic wristwatch with a generator is limited to 5 to 4 t*tyn due to its size. The magnetic rotor receives a braking force due to electromagnetic induction when it rotates and generates electricity. Therefore, with the torque of the rotating weight mentioned above, even if the rotation of the rotating weight is accelerated by an intermediate gear in a normal mobile phone, the magnetic rotor can only rotate at about 100 to 300 r, p, s.

Here, the number of turns of the coil is N, and the magnetic flux passing through the coil is φ
, when the rotation angle of the magnet rotor is θ, the voltage E induced in the coil is expressed as follows.

dφ dφ dθ E” tn= N−To ctt ”'”' (
")d"/dt is the rotation speed ω of the magnet rotor, and if the maximum value of the magnetic flux passing through the coil is φmax, the above formula (
1) becomes B=Nφmax sinθω°...'' (2).In other words, the voltage E induced in the coil depends on the number of turns of the coil, the maximum value of the magnetic flux passing through the coil, and the rotation of the magnet synchronous rotor. It is proportional to the speed.If the resistance of the coil is RC and the inductance of the coil is L, then the impedance 2 of the charging circuit is as shown in the following equation.

2=ρ possible T-T■ town...(8) becomes.

As can be seen from equation (4) above, in order to extract a large current value from the power generator, the number of coil turns must be increased and the coil resistance must be decreased. Coil resistance is proportional to the length of the coil winding wire and inversely proportional to the cross-sectional area of the coil winding wire, so in order to satisfy the above conditions, a large number of coils must be wound with thick coil winding wire. However, the power generation device described above must be made particularly compact for use in an electronic wristwatch. Therefore, making the coil smaller and winding a large number of thick coil wires are contradictory. In other words, when winding a coil within a limited coil size, thin coil windings will increase the number of coil turns, but the coil resistance will increase and sufficient current value will not be obtained, and thick coil windings will As the number of turns decreases, the induced voltage becomes low, and therefore a sufficient current value cannot be obtained. Therefore, when winding a coil within a limited coil size, the diameter of the coil winding wire must be set so that the generated current value is the highest.

Figure 5 shows the relationship between the coil winding diameter and the generated current when the magnet rotor is rotated at a rotation speed of 20 Or, p, 8 and the coil winding volume excluding the magnetic core is kept constant at 30 -. It is something that As can be seen from FIG. 5, when the coil winding diameter becomes 18 μm or less, the generated current value decreases rapidly, and even when the coil winding diameter becomes 54 μm or more, the generated current value decreases rapidly. In other words, the coil winding volume is 6
When the value is 0-, unless the coil is wound with a coil winding diameter of 18 to 34 μm, the power generation performance of the coil volume cannot be fully extracted. Such a phenomenon also appears with other coil winding volumes.

Figure 4 shows the coil windings at the upper limit (○ mark) and lower limit (x immediately) where the generated current in each coil winding volume suddenly decreases when the magnet rotor is rotated at rotational speeds of 200 r, p, and s. Diameter d (tMn) and coil winding volume VO (-)
This shows the ratio /d. As shown in Figure 4, in order to fully derive power generation performance from each coil volume, the coil winding volume vc (-) and the coil winding diameter d (w
The coil must be wound with the ratio v0/d to m) set between 700 and 1800.

Figure 5 shows the relationship between the coil winding volume and the generated current at the optimum coil winding diameter for each coil winding volume when the magnet rotor is rotated at rotational speeds of 200 r, p, and e. It is something. As can be seen from FIG. 5, the larger the coil winding volume, the higher the generated current value. At this time, the current consumption of the electronic wristwatch is 1-2 μA per second, so the current consumption for one day is 86.4 sacrificial A to 172.8 mA.
It is. In addition, the rotating weight is usually about 7 times per day on mobile phones.
Since the rotation speed of the rotating weight is approximately 1 r, p, s as mentioned above, the magnetic rotor rotates at 100-300 r, p, s and approximately 700-1200 revolutions per day.
Rotate for seconds. Therefore, in order to generate one day's worth of current consumption in the rotation time of the magnet rotor, the magnet rotor must be
When rotated with 0 r, p, and s, it must be 250 μ8 or more. Therefore, as can be seen from FIG. 5, the coil winding volume must be at least 20 gJ or more. The coil size at this time is magnetic core width 1.2 tgm, magnetic core thickness 0.511I11, coil width 2.5 mm, coil thickness 1°8 mm, coil length 611II! It is.

By the way, the coil size used in watch step motors is generally about 2.51 RII coil width, 1.9 RAN w coil thickness, and 6 RAN W coil length.
At least the power generation coil must be larger than the watch coil. In addition, since the power generation coil is built into the electronic wristwatch, the coil volume is 85 mm (magnetic core width 1, 2 tan * core thickness 0.5 mm, coil width 56 mm, coil thickness 2.9 m) considering the movement size.
Although the present invention has been described in detail with reference to the illustrated embodiments, the present invention is not limited to the illustrated embodiments, and the present invention is not limited to the illustrated embodiments. The combination of gears, etc. can be changed as appropriate. It is also applied when the power generation unit is shared with a structure that generates power by operating an external operating member.

〔Effect of the invention〕

As explained above, the present invention makes the coil winding volume of the power generation device at least 20 mm2 or more, and the ratio of the coil winding wire diameter dcm> to the coil winding volume Vc (-) /d
By winding the coil with the ff set to 800 to 1800, the power generation performance of the power generator can be maximized. Can generate electric current value.

In addition, because the conversion efficiency of the magnetic flux flowing through the coil to electricity becomes higher, sufficient power can be generated even with less magnetic flux passing through the coil, and the magnet rotor can therefore be made smaller. Disturbance of the magnetic field caused by the magnet rotor, which is most disliked by a step motor for a watch, is reduced, ensuring the reliability of the watch, and eliminating the need for an anti-magnetic structure, resulting in a simple structure and low cost. Furthermore, as the power generation efficiency increases, the amount of unbalance of the rotating weight, which is the input energy, can be reduced, making it possible to make the electronic wristwatch equipped with a power generation device smaller and thinner, allowing for free design development. It becomes like this.

[Brief explanation of the drawing]

Figure 1 is a schematic plan view of an electronic wristwatch with a power generation device. Figure 2 is a schematic plan view of an electronic wristwatch with a generator.
Fig. 5 is a diagram of the charging circuit used in the present invention, and Fig. 4 is a diagram showing the relationship between the coil winding diameter and the generated current in the embodiment of the present invention. Figure 5 is a relationship diagram showing the ratio of the coil winding volume and the generated current in the embodiment of the present invention.
...Synchronized weight 6...Magnet rotor 8...Coil 20...Charging control circuit 21...Secondary Power supply 22... Time M [More than body

Claims (1)

[Claims] In a device that converts mechanical energy obtained from a rotating weight using arm movement or gravity into electrical energy through relative motion between a magnetic rotor and a coil wound around a stator surrounding the magnetic rotor, the coil The winding volume is at least 20 mm^2 or more, and the winding diameter d (m
80 between m) and the coil winding volume Vc (mm^2)
An electronic wristwatch with a power generation device, characterized in that it has a relationship of 0≦Vc/d≦1800.