JPH03218493A - Wrist watch with generator - Google Patents

Abstract

PURPOSE:To obtain the wrist watch with a high-efficiency generator with the good responsiveness of a rotary weight by disposing an axial flux type generator in the through-hole provided in a substrate which is disposed in proximity there to without interposing other members between the generator and the gears on a hand arbor. CONSTITUTION:Plural hollow generating coils 8 are radially and flatly laid out around the central axis of rotation and are fixed to a coil lead substrate 9. The substrate 9 is in superposition and contact with the rotary substrate and feeds generated electric power to a circuit block. There is an air gap on the rear surface of the coils 8 and a rotating stator yoke 10 is sectionally disposed. This yoke 10 is fitted to a revolving shaft and rotates coaxially therewith. A magnet 7 fixed to a rotor yoke 6 is integrated to the revolving shaft to form a rotor. The magnet 7 of such axial flux type generator forms a magnetic path with the rotating stator yoke 10 on the rear surface of the coils 8 and the coils 8 interposed therebetween. Since the distribution of magnetic fluxes is uniform, the power in a rotating direction is not generated with both the rotating stator type and the fixed stator type. The generation of index torque, etc., is thus obviated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wristwatch with a generator using an axial flux type generator. [Summary of the Invention] The present invention provides a power generation coil in which a plurality of hollow coils are arranged radially around the center of rotation of a power generation rotor and fixed to a base plate, and a soft lif! It consists of a rotor that has a rigid body fixed to it and has an integral rotating body and shaft, and a stator on the other side of the generating coil. Compared to generators that generate electricity using the rotation of a two-pole motor for watches, this axial flux generator has no index torque, reduces the input torque at initial startup, and enables smoother rotation of the rotating weight. Become.

However, since it overlaps with magnets, coils, stators, etc. cross-sectionally, it causes an increase in thickness, but by setting the center of rotation inside the date wheel, the lower tenon can be installed on the back plate of the calendar, etc. Even if the 1itf1 becomes thicker, it can be placed without increasing the thickness of the movement.
In addition, in order to accommodate the flat disk-shaped generator motor without increasing the outer diameter of the watch, the outer shape of the generator coil and the gear on the pointer shaft located at the center of the watch are placed close together without intervening other parts. It is located. Generators generate electricity when the flux in the direction of the rotating shaft intersects with the hollow coil, but it is vulnerable to magnetic flux leakage from the sides, and if there is a magnetic material from the hand movement motor nearby, the performance will be affected due to mutual magnetic flux leakage. Mimics the decline in 《.
For this reason, they are placed far apart from each other in symmetrical positions with the winding axis as the central axis, or in positions close to point symmetry with respect to the pointer axis. [Prior art] In the conventional technology, the rotor 6f1 stone of a two-ball step motor as shown in FIG. Electric power was generated in the coil by changing the magnetic flux passing through the magnetic core. In addition, in the above-mentioned horizontal construction, the stator and the coils are arranged separately in a plane, so that they are less likely to overlap and are advantageous in terms of thickness.

[Problem to be Solved by the Invention] However, in the conventional two-ball step motor type generator, an index torque is generated in the rotor, and the rotor cannot rotate unless the starting torque is generated as potential energy of the rotating weight. In other words, in order to easily generate the starting torque corresponding to the index torque in the rotating heavyweight, it was necessary to increase the moment of the rotating heavyweight.
An axial flux type generator was used. In this case, the advantageous movement layout problem is to avoid increasing the thickness of the movement in cross-section, as with the disk-shaped axial flux type, and without increasing the outer diameter in plan view. It is necessary to ensure the volume of the heel, and consider the magnetic effect on the motor for moving the hands.

[Means for Solving the Problem] In order to solve the problem, in the present invention, an axial flux type generator without index torque is placed close to the gear on the pointer shaft without intervening other members. In terms of cross section, the lower tenon was placed on the back plate of the calendar and placed inside a through hole in the main plate, allowing the movement to be placed without increasing the thickness. Magnetically, the hand movement motor and the winding stem are located symmetrically around the central axis, or are located remotely at points symmetrically around the pointer axis. [Function] By making the generator a flat coreless smoke type, it was possible to eliminate the index torque of the generator, reducing the starting torque, improving the responsiveness of the rotating heel, and increasing the amount of power generated. ．． Furthermore, the conversion efficiency exceeded 50%.

In terms of layout, the size of the rotating heavy heel is kept the same without increasing the thickness of the movement or the outer diameter, and 6f to the hand movement motor! We were able to minimize the environmental impact.

[Embodiment 1] An embodiment of the present invention will be described with reference to FIGS. 1 and 2. The axial flux type generator is as shown in Figure 1. I number of hollow power generation coils 8 are connected to the rotation center axis,
The plane is laid out in a radial pattern. Generator coil 8
The coil lead board 9 is fixed to the coil lead board 9 and the end of the coil wire is processed.
It overlaps the rotating board and feeds the generated power to the circuit block. A rotary stator yoke IO is disposed in cross section on the lower surface of the generator coil 8 with an air gap. This rotating stator yoke 10 is attached to a rotating shaft and rotates in the same manner. A magnet 7 fixedly attached to a rotor yoke 6 is integrated with the rotating shaft to form a rotor. In Fig. 1, the rotating stator yoke 10 rotates below the hollow coil, but a type in which it is fixed to the hollow coil and fixed to the ground It is also conceivable. A rotor pinion 5 is provided on the rotating shaft of the rotor, and the transmission wheels 19, 3, and 4 mesh with the gears provided on the rotating weight 16, which is integrated with the rotating weight l6. It transmits the rotation of weight 16. Rotating stake yoke 10. Since the generator coil 8, I stone 7, and rotor yoke 6 are stacked on one axis in cross-section, their thickness increases. By penetrating through the main plate l and providing a lower tenon on the calendar back plate l5, the thickness of the movement is prevented from increasing. In addition, since the magnet 7 of the generator motor tends to cause magnetic flux leakage when a magnetic material is brought close to the side surface, the hand movement stator 21 of the hand movement motor. It is laid out away from the hand movement coil 20, etc. In such an axial flux type generator, the magnet forms a magnetic path through the rotating stator yoke lO on the lower surface of the generating coil 8 and the generating coil 8, and the magnetic flux distribution is uniform.
Both the rotating stator type and the fixed stator type have a structure that does not generate force in the rotational direction and does not generate index torque or the like.

In addition, with the rotating stator type, since the magnet and rotating stake rotate simultaneously, there is no change in the magnetic flux within the rotating stator, so there is no iron loss. In the case of a fixed stator type, the air gap to the stakes is reduced and the magnetic flux passing through the coil increases, but the flow of magnetic flux occurs within the stator, resulting in iron cross-section, which has both advantages and disadvantages. In order to efficiently lay out a flat coreless type generator on a plane, the present invention is arranged close to the outer shape of the gear on the pointer shaft and the outer shape of the generator without intervening other members, and the outer circumference of the watch is This prevents divergence and secures the volume of the rotating heavy god. [Effects of the Invention] If the layout of the present invention is applied and a flat coreless type generator is used, it will be possible to generate electricity with good response of the rotating weight and high efficiency compared to the conventional two-ball step motor type generator. You can get a mechanical wristwatch.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention. FIG. 2 is a sectional view showing an embodiment of the present invention. Figure 3 is a plan view of a conventional watch with a function II. l 2 3 4 5 6 7 ・ 8 ・ 9 ・ l O ・ 11 ・ l 2 ・ l 3 ・ l 4 ・ Main plate transmission receiver Second transmission wheel Third transmission wheel Generator rotor Kana Rotor yoke Magnet Generator coil lead Board Rotating stator yoke 4th car, hour wheel, 3rd wheel l 5 ・ l 6 l 7 ・ l 8 ・ l 9 ・ 20 ・ 2 l ・ 2 2 ・ ・Calendar back plate・11 rotating weight elements・Date wheel・1st transmissionﾾCar/hand movement coil/hand movement stator/power generation stator

Claims (1)

[Claims] A wristwatch with a generator includes a rotating weight that converts potential energy into rotational kinetic energy, and a generator driven by a speed increasing gear train that meshes with gears attached to the rotating weight, the generator including a plurality of A hollow coil is arranged in a plane radially around the motor rotation axis, a multipolar permanent magnet is arranged facing the hollow coil, and on the other surface of the permanent magnet opposite to the surface facing the coil, Soft magnetic material is fixed to form an integrated rotor.
The generator has an axial flux type generator in which a soft magnetic material is arranged as a stator on the back side of the surface where the hollow coil faces the permanent magnet, and the stator is fixed to the coil,
Alternatively, the generator is fixed and rotatably arranged together with the rotor on the central rotating shaft, and furthermore, the rotation center of the generator is arranged inside the inner diameter of the date dial, and at the same time, the clock pointer wheel train drive motor is A power generation device characterized in that the outer shape of the generator and the charging element are located close to each other without intervening other members between the outer shape of the generator and the gear coaxially arranged with the pointer shaft. Mechanical wristwatch.