JP2008267979A - Electronically controlled mechanical timepiece, and method of reducing cogging torque - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a timepiece having a generator capable of reducing cogging torque without degrading power generating performance. <P>SOLUTION: The generator 4 comprises a pair of magnetic circuit forming members 42A, 42B; a rotor having a magnet; an auxiliary magnetic circuit forming member 42C laminated and arranged to straddle the other end sides 46A, 46B of the respective magnetic circuit forming members 42A, 42B to make the other end sides 47A, 46B magnetically conductive to each other; and a coil wound on at least one of the magnetic circuit forming members 42A, 42B. The other end sides 46A, 46B are provided spaced from each other, and a clearance G2 is formed between side faces 461A, 461B of the other end sides 46A, 46B. Thereby the cogging torque can greatly be reduced while maintaining the power generating performance of the generator 4 compared with the case of allowing the other end sides 46A, 46B of the magnetic circuit forming members 42A, 42B to abut on each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronically controlled mechanical timepiece and a method for reducing cogging torque of the electronically controlled mechanical timepiece.

2. Description of the Related Art Conventionally, as a timepiece, an electronically controlled mechanical timepiece is known that converts mechanical energy released from a mainspring or the like into electric energy and adjusts a train wheel by the electric energy. More specifically, in such an electronically controlled mechanical timepiece, a rotor with a magnet driven by a mainspring through a train wheel, a stator in which the rotor is rotatably arranged, and a part of the stator are wound. A generator (electromagnetic converter) having a coil is provided. When the train wheel is rotated by the mechanical energy released from the mainspring, this rotational motion is transmitted to the rotor, the rotor rotates, and an electromotive force is generated in the coil by electromagnetic induction. Then, the control circuit is driven by this electromotive force to adjust the rotational speed of the rotor, thereby braking the wheel train and adjusting the wheel train. At this time, in a general male watch (outer diameter 25 mm to 30 mm), the electric power necessary to drive the control circuit is about 25 nW. In order to obtain this electric power, the power from the mainspring to the rotor is increased. The speed ratio is set to about 270,000 times, for example. The torque of the mainspring is set to about 8 × 10 ⁻³ Nm, and the driving torque of the rotor is about 1 × 10 ⁻⁸ Nm.

  In recent years, there is an increasing demand for downsizing of such electronically controlled mechanical timepieces. However, when the size of the movement is reduced, the size of the mainspring is also reduced, and the mechanical energy stored in the mainspring (= the number of turns of the mainspring (duration) × the torque of the mainspring) is also reduced. For this reason, in order to reduce the size of the watch while maintaining a duration that has a great influence on the merchantability, it is necessary to reduce the torque of the mainspring, that is, the driving torque of the rotor connected to the mainspring via a train wheel. Is important.

Thus, conventionally, it has been proposed to reduce the driving torque of the rotor by reducing the resistance when the rotor rotates, that is, the cogging torque (see, for example, Patent Documents 1 and 2).
In the timepiece (quartz timepiece) described in Patent Document 1, a notch projecting radially outward, that is, a notch, is formed on the outer periphery of a stator hole (rotor hole portion) of a stator in which a rotor is disposed. × thereby reducing the ¹⁰ -6 Nm approximately cogging torque to approximately 1 × ¹⁰ -6 Nm.

  In the timepiece disclosed in Patent Document 2, the stator is configured to be deformable, and a bush concentric with the rotor is provided inside the stator hole, so that the stator hole can be deformed even if there is some variation in the shape of the stator hole. The shape of the stator hole can be corrected to the same shape as the bush, that is, the shape concentric with the rotor. Thereby, in the timepiece described in Patent Document 2, the gap between the stator hole and the rotor is made uniform, and variation in magnetic characteristics due to the rotation angle of the rotor is suppressed, thereby reducing the cogging torque.

JP-A-8-75873 JP 2001-108766 A

However, in the quartz timepiece described in Patent Document 1, the cogging torque of about 2 × 10 ⁻⁶ Nm is reduced to about 1 × 10 ⁻⁶ Nm by forming a notch, but in the electronically controlled mechanical timepiece, Since the cogging torque of about 1 × 10 ⁻⁸ Nm, which is two orders of magnitude smaller than these cogging torques, is handled, there is a problem that the influence of the notches is too great, and conversely, if the notches are provided, the cogging torque is increased.

  In addition, in the timepiece described in Patent Document 2, when the center of the magnet provided on the rotor deviates from the center of the rotor due to manufacturing variations, the center of the magnet with respect to the stator hole (bush) when the rotor is installed. There is a problem that the cogging torque cannot be reduced by making the gap between the stator hole and the rotor uniform, because the cogging torque is arranged at an eccentric position. Here, it is conceivable to suppress the influence of the eccentricity of the magnet by widening the gap between the magnet and the stator and lowering the permeance, but in this case, the magnetic flux flowing in the stator is reduced and the power generation performance is reduced. There is a problem of end.

  An object of the present invention is to provide an electronically controlled mechanical timepiece capable of reducing cogging torque without deteriorating power generation performance, and a method for reducing cogging torque.

  An electronically controlled mechanical timepiece according to the present invention includes a mechanical energy source, a generator that is driven by a train connected to the mechanical energy source and generates power, and is driven by electric power generated by the generator. An electronically controlled mechanical timepiece comprising a control circuit that brakes the train wheel by controlling the rotation period to regulate the train wheel, and the generator is connected to a rotor at one end when combined. A pair of magnetic circuit forming members in which holes are formed, a rotor having magnets and disposed in the rotor holes, and stacked so as to straddle the other end side of each of the magnetic circuit forming members. An auxiliary magnetic circuit forming member that magnetically conducts the other end sides of the circuit forming member, and a coil wound around at least one of the magnetic circuit forming members. Provided apart from each other , Between the side surface of the other end, characterized in that a gap is formed.

According to the present invention, the other end side of the magnetic circuit forming member is disposed apart from each other, and a gap is formed between the side surfaces of the other end side of the magnetic circuit forming member. In addition, nothing may be interposed in the gap (in this case, air exists in the gap), or a member having a lower magnetic permeability than the auxiliary magnetic circuit forming member (for example, resin or the like) ), The member may be interposed.
In this way, as a magnetic circuit path through which the magnetic flux generated from the rotor passes, one magnetic circuit forming member, an auxiliary magnetic circuit forming member, a main path passing through the other magnetic circuit forming member, and one magnetic circuit forming member, Two paths, a gap formed between the side surfaces of the magnetic circuit forming member and an auxiliary path passing through the other magnetic circuit forming member, are formed, and the side surfaces on the other end side of the magnetic circuit forming member are brought into contact with each other. Compared to the case, the cogging torque is greatly reduced without lowering the power generation performance of the generator.
Therefore, since the resistance when the rotor rotates can be reduced, the startability of the rotor can be improved.
In addition, since the resistance when the rotor rotates can be reduced, the rotation of the rotor, that is, the hand movement becomes smooth. For example, when the chronograph is moved, the elapsed time can be accurately displayed, and the reliability of the watch Can be improved.
Furthermore, by reducing the cogging torque, the load torque applied to the train wheel can be reduced, and the durability of the timepiece can be improved.
Since the torque of the mechanical energy source composed of, for example, the mainspring can be reduced by reducing the cogging torque, the mechanical energy source can be reduced in size while maintaining the duration, and the watch is thin. And miniaturization can be realized.
Further, the magnetic equilibrium point of the rotor can be changed by providing a gap between the side surfaces on the other end side of the magnetic circuit forming member and constructing the magnetic circuit by two paths, the main path and the auxiliary path. . Thereby, the rotor can be stopped at a position where the meshing efficiency of the train wheel is the best.
Examples of the mechanical energy source include a mainspring, rubber, a spring, and the like.

  In the electronically controlled mechanical timepiece of the invention, an adjustment hole is formed in the other end side of each magnetic circuit forming member and the auxiliary magnetic circuit forming member, and each adjustment hole has a diameter larger than that of each adjustment hole. It is preferable that a small guide pin is inserted and a gap is formed between each adjustment hole and each guide pin.

In addition, you may fasten the other end side of a magnetic circuit formation member, and an auxiliary magnetic circuit formation member by forming a screw hole in the guide pin which penetrates an adjustment hole, and screwing a male screw in the said screw hole. In addition, the length of the guide pin is formed to be longer than the thickness of the other end side of the magnetic circuit forming member and the auxiliary magnetic circuit forming member, and a male screw is formed at the tip of the guide pin through which these members are penetrated. The other end side of each magnetic circuit forming member and the auxiliary magnetic circuit forming member may be fastened by screwing a fastening member such as a nut to the tip portion where the male screw is formed.
According to the present invention, since the gap is formed between each adjustment hole and each guide pin, when fixing the other end side of the auxiliary magnetic circuit forming member, the fixing position on the other end side can be finely adjusted. Can do. Accordingly, the width of the gap formed between the side surfaces on the other end side of the auxiliary magnetic circuit forming member can be finely adjusted, and the cogging torque can be reliably reduced.

In the electronically controlled mechanical timepiece of the invention, the width of the gap formed between the other end sides of each magnetic circuit forming member is 1/10 or more and 1/5 or less of the thickness of the magnetic circuit forming member. It is preferable that it is the dimension of these.
According to the present invention, since the width of the gap formed between the other end sides of each magnetic circuit forming member is not less than 1/10 and not more than 1/5 of the thickness of the magnetic circuit forming member, Torque can be reduced more reliably.

In the electronically controlled mechanical timepiece according to the invention, a notch is formed on one end side of each magnetic circuit forming member, and each notch is formed in a continuous semicircular arc shape, and the magnetic circuit forming members are combined. It is preferable that the rotor holes are formed on the same circumference.
According to the present invention, the notch portion of each magnetic circuit forming member has a continuous semicircular arc shape, and notches such as notches are not formed, so that the shape of each magnetic circuit forming member is complicated. It can suppress and manufacturing cost can be reduced.

In the electronically controlled mechanical timepiece of the invention, it is preferable that each magnetic circuit forming member is formed by laminating amorphous metal layers.
According to the present invention, the magnetic circuit forming member has a very high magnetic permeability because the amorphous metal layer is laminated in multiple layers. Therefore, the power generation performance of the generator can be improved.

  The method of reducing cogging torque according to the present invention includes a mechanical energy source, a generator that generates power by driving a rotor by a gear train connected to the mechanical energy source, and a power generator that is driven by electric power generated by the generator. A method for reducing the cogging torque of the rotor of an electronically controlled mechanical timepiece comprising a control circuit that brakes the train wheel and controls the train wheel by controlling the rotation cycle of the machine, A pair of magnetic circuit forming members in which a rotor hole is formed on one end side when the machines are combined, the rotor having a magnet and disposed in the rotor hole, and the other end side of each magnetic circuit forming member And an auxiliary magnetic circuit forming member that is magnetically connected between the other end sides of each of the magnetic circuit forming members, and a coil that is wound around at least one of the magnetic circuit forming members. The other end side of each magnetic circuit forming member is provided apart from each other, and a gap is formed between the side surfaces of the other end side so that the width of the gap can be adjusted for each magnetic circuit forming member. The cogging torque is reduced by configuring and adjusting the width of the gap, or by interposing a member having a lower magnetic permeability than the auxiliary magnetic circuit forming member in the gap.

In the present invention, the magnetic circuit includes a pair of magnetic circuit forming members, a rotor, an auxiliary magnetic circuit forming member, and a coil. The main path passes through the auxiliary magnetic circuit forming member, and the auxiliary path passes through a gap formed between the side surfaces of the magnetic circuit forming member.
According to the present invention, two paths are formed as the path of the magnetic circuit through which the magnetic flux generated from the rotor passes, the main path and the auxiliary path having a lower magnetic permeability than the main path. Therefore, the same effect can be obtained with the same configuration as the above-described invention.
Further, by adjusting the width of the gap between the other end sides of the magnetic circuit forming member, or by interposing a member (for example, resin) having a lower magnetic permeability than the auxiliary magnetic circuit forming member in the gap, Since the magnetic susceptibility can be adjusted, the cogging torque can be reliably reduced.

  According to the electronically controlled mechanical timepiece of the invention, it is possible to reduce the cogging torque without reducing the power generation performance.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view of a timepiece 1 according to an embodiment of the present invention, and FIG.
As shown in FIGS. 1 and 2, the electronically controlled mechanical timepiece 1 includes a mainspring 2 that is a mechanical energy source, and a train wheel 3 that is connected to the mainspring 2 and driven by releasing the mechanical energy of the mainspring 2. The generator 4 is connected to the train wheel 3 and generates power by the rotational movement from the mainspring 2. The generator 4 is driven by the electric power generated by the generator 4, and the train 4 is braked by controlling the rotation cycle of the generator 4. And a control circuit 5 (see FIG. 3) for adjusting the speed of the train wheel 3. The timepiece 1 also includes a pointer 301 (see FIG. 3) connected to the train wheel 3, a hand winding mechanism (not shown) for winding the mainspring 2, and the like. Since the configuration of the manual winding mechanism and the like is a known configuration, description thereof is omitted.

  As shown in FIG. 2, the mainspring 2 is accommodated in a barrel 31A, and a barrel gear 31B is formed on the outer periphery of the barrel 31A. The mainspring 2, the barrel 31A, and the barrel gear 31B are provided to constitute the barrel 31 (first wheel). The second wheel 32 constituting the train wheel 3 is engaged with the barrel wheel 31, and the train wheel 3 is rotated by the rotation of the barrel wheel 31 by the unwinding force of the mainspring 2.

  As shown in FIGS. 1 and 2, the train wheel 3 includes a second wheel 32 (see FIG. 2), a third wheel 33, and a second wheel 32 in which a second wheel 32 is disposed on a shaft 341. 34, fifth wheel 35, and sixth wheel 36 that meshes with the rotor 41 of the generator 4. These wheel trains 3 are supported by the main plate 302, the second receiver 303, and the wheel train receiver 304, and the rotation of the barrel complete 31 is increased about 270,000 times and transmitted to the rotor 41. A minute hand (not shown) is provided on the hour pinion 305 of the second wheel 32, and an hour hand (not shown) is provided on an hour wheel 306 that is rotated from the hour pinion 305 through a minute wheel (not shown). Second hands (not shown) are respectively fixed to the.

  As will be described in detail later, the generator 4 is, as shown in FIGS. 1 and 2, a rotor 41 that meshes with the sixth wheel 36 and has a two-pole permanent magnet, a stator 42 on which the rotor 41 is rotatably arranged, and Coils 43A and 43B wound around a part of the stator 42 are provided.

FIG. 3 is a block diagram showing a configuration of the electronically controlled mechanical timepiece 1 of the present embodiment.
As described above, the timepiece 1 includes the mainspring 2, the wheel train 3 that is connected to the mainspring 2 and driven by releasing the mechanical energy of the mainspring 2, and the rotation of the mainspring 2 is transmitted by the wheel train 3 at an increased speed. And a control circuit 5 that brakes the train wheel 3 to regulate the speed of the train wheel 3 by controlling the rotation cycle of the generator 4.

The generator 4 is driven by the mainspring 2 via the train wheel 3 and generates an induced power. The AC output from the generator 4 is stepped up and rectified through a rectifier circuit 51 and charged and supplied to a capacitor 52.
The control circuit 5 constituted by a one-chip IC is driven by the power supplied from the capacitor 52. The control circuit 5 includes an oscillation circuit 53, a rotation detection circuit 54 of the rotor 41, and a brake control circuit 55.

  The oscillation circuit 53 outputs an oscillation signal (32768 Hz) using a crystal resonator 531 which is a time standard source, divides this oscillation signal by a predetermined frequency dividing circuit, and outputs it to the brake control circuit 55 as a reference signal fs. is doing.

The rotation detection circuit 54 detects the rotation speed of the rotor 41 from the power generation waveform output from the generator 4 and outputs the rotation detection signal FG to the brake control circuit 55.
The brake control circuit 55 inputs a brake signal to the generator 4 based on the phase difference of the rotation detection signal FG with respect to the reference signal fs. As a result, braking is applied to the wheel train 3 to adjust the speed of the wheel train 3, and the time is displayed by the hands 301 connected to the wheel train 3.

Below, the generator 4 which is the characteristic part of the timepiece 1 of this embodiment is explained in full detail.
As described above, the generator 4 includes the rotor 41, the stator 42 on which the rotor 41 is rotatably arranged, and the coils 43A and 43B wound around a part of the stator 42.
As shown in FIG. 2, the rotor 41 includes a rotor magnet 411 that is a two-pole permanent magnet, a rotor pinion 412 that meshes with the sixth wheel 36, and an inertia plate 413 that suppresses rotation unevenness of the rotor 41. Has been.

FIG. 4 is an enlarged view of the generator 4.
As shown in FIG. 4, the stator 42 is laminated and fixed to a pair of stator main bodies 42A and 42B as magnetic circuit forming members on which the rotor 41 is arranged on one end side, and the other end sides of the stator main bodies 42A and 42B. And a yoke 42C as an auxiliary magnetic circuit forming member.

  The stator main bodies 42A and 42B are arranged in parallel as shown in FIG. The stator bodies 42A and 42B are formed by laminating an amorphous metal layer made of an amorphous (amorphous) alloy thin film to about 20 layers with an adhesive layer interposed therebetween, and is configured in a plate shape having a thickness of 0.50 mm. ing. This thickness prevents the magnetic flux from the outside from affecting the rotor 41 surrounded by the stator main bodies 42A and 42B. The amorphous metal layers are bonded to each other by an adhesive layer.

  As shown in FIG. 4, rotor arrangement portions 45A and 45B in which the rotor 41 is arranged are formed on one end side of the stator main bodies 42A and 42B, and a yoke 42C is laminated and fixed on the other end side. Conducting portions 46A and 46B are formed. Core portions 47A and 47B around which coils 43A and 43B are wound are formed between the rotor arrangement portions 45A and 45B and the magnetic conduction portions 46A and 46B in the stator main bodies 42A and 42B. The number of turns of the coils 43A and 43B wound around the core portions 47A and 47B is the same. The coils 43A and 43B are connected in series.

FIG. 5 is an enlarged view of the timepiece 1 showing the rotor arrangement portions 45A and 45B.
As shown in FIG. 5, stator notches 451A and 451B are formed inside the rotor placement portions 45A and 45B. Each stator notch 451A, 451B is formed in the shape of a continuous semicircular arc. Each stator notch 451A, 451B is a predetermined size between the end portions 453A, 453B while being abutted against a bush 452 (see FIG. 2) press-fitted into the main plate 302 when each stator body 42A, 42B is installed. Are arranged so as to form a gap G1. As a result, the stator notches 451A and 451B are both arranged on the same circumference to form the rotor hole 454. The rotor 41 is disposed at the center of the rotor hole 454.

Further, as shown in FIG. 5, a fixing pin hole 455 is formed in each of the rotor placement portions 45A and 45B. A fixing pin 456 (see FIG. 4) to be press-fitted into the main plate 302 is inserted into the fixing pin hole 455.
A line segment 457 shown in FIG. 5 is a line that passes through the center of the rotor magnet 411 and is orthogonal to the line that connects the gap G1. A line segment 458 is a line connecting the N pole and the S pole of the rotor magnet 411. θ is a rotation angle of the rotor 41, and is an angle formed by the line segment 457 and the line segment 458.

6 is a cross-sectional view of the timepiece 1 showing the magnetic conduction portions 46A and 46B, and is a cross-sectional view taken along the line VI-VI in FIG.
As shown in FIG. 6, a yoke 42 </ b> C is laminated and fixed on the magnetic conduction portions 46 </ b> A and 46 </ b> B of the stator main bodies 42 </ b> A and 42 </ b> B so as to straddle the magnetic conduction portions 46 </ b> A and 46. The yoke 42C is made of PC permalloy or the like and has a thickness of 0.25 mm. An adjustment hole 7 is formed in each of the magnetic conduction portions 46A and 46B and the yoke 42C. The first shaft portion 62 of the guide pin 6 planted on the main plate 302 is inserted into these adjustment holes 7.

  Here, the guide pin 6 will be described in detail. The guide pin 6 includes a support portion 61 that supports the magnetic conduction portions 46A and 46B, and the first shaft portion 62 that is erected on one surface of the support portion 61. And a second shaft portion 63 erected on the other surface of the support portion 61. The diameter of the first shaft portion 62 is formed to be smaller than the diameter of the adjustment hole 7, and when inserted into the adjustment hole 7, a slight gap (backlash) is formed between the first shaft portion 62 and the adjustment hole 7. It has become. The guide pin 6 is planted on the ground plane 302 when the second shaft portion 63 is press-fitted into a hole 307 formed in the ground plane 302. In the guide pin 6, a screw hole 64 is formed across the first shaft portion 62 and the support portion 61.

Then, when the adjustment screw 65 is screwed into the screw hole 64, the magnetic conduction portions 46A and 46B and the yoke 42C are fastened. At this time, each magnetic conduction part 46A, 46B is more than 1/10 of the thickness (5.00 × 10 ⁻¹ mm) of the stator main bodies 42A, 42B between the side surfaces 461A, 461B of the magnetic conduction parts 46A, 46B. They are separated from each other so that an air gap G2 of 1/5 or less is formed.

  Here, in this embodiment, since a slight gap is formed between the first shaft portion 62 and the adjustment hole 7, the magnetic conduction portions 46 </ b> A and 46 </ b> B are slightly rotated around the fixing pin 456. Thus, the fixing position of each of the magnetic conduction portions 46A and 46B can be finely adjusted. Therefore, the width of the air gap G2 can be easily finely adjusted. In addition, each magnetic conduction | electrical_connection part 46A, 46B is installed completely apart so that side surface 461A, 461B of each said magnetic conduction | electrical_connection part 46A, 46B may not carry out surface contact or point contact.

  In the generator 4 of this embodiment, the magnetic flux generated from the N pole of the rotor magnet 411 passes through one stator body, the yoke 42C, and the other stator body of the stator body 42A and the stator body 42B. After passing through the path or the path passing through one stator body, the air gap G2, and the other stator body, the S pole of the rotor magnet 411 is reached. Thus, an annular magnetic circuit is formed in the generator 4 of the present embodiment. The path passing through the yoke 42C is the main path of the magnetic circuit, and the path passing through the air gap G2 (air) having a lower permeability than the yoke 42C is the auxiliary path of the magnetic circuit.

FIG. 7 is a diagram illustrating a measurement result of the interlinkage magnetic flux interlinking with the coils 43A and 43B when the width of the air gap G2 is changed in the generator 4 of the present embodiment.
As shown in FIG. 7, even if the width of the air gap G2 is increased from 0.00 mm to 1.40 × 10 ⁻¹ mm, the flux linkage is changed from 1.262 × 10 ⁻⁷ Wb to 1.237 × 10 ^{− It} turns out that it changes only to ⁷ Wb and falls only about 2%. Therefore, since the power generation amount is proportional to the change of the flux linkage, it can be seen that even if the air gap G2 is provided, the power generation amount is hardly affected.

FIG. 8 shows the generator 4 (air gap 0) of the present embodiment in which the size of the air gap G2 is 0.00 mm, and the size of the air gap G2 in the present embodiment in which the size of the air gap G2 is 5.00 × 10 ⁻² mm. It is a figure which shows the measurement result of the cogging torque at the time of changing rotation angle (theta) of the rotor 41 in the generator 4 (air gap 5).

As shown in FIG. 8, when the size of the air gap G2 is 0.00 mm, that is, when the air gap G2 is not provided, the peak value of the cogging torque is 1.28 × 10 ⁻⁸ Nm. On the other hand, when the size of the air gap G2 is 5.00 × 10 ⁻² mm, the peak value of the cogging torque is 7.80 × 10 ⁻⁹ Nm. Therefore, it can be seen that when the size of the air gap G2 is set to 5.00 × 10 ⁻² mm, the peak value of the cogging torque can be reduced to about 60% compared to the case where the air gap G2 is not provided. Therefore, it can be seen that by providing the air gap G2, the cogging torque can be significantly reduced without reducing the amount of power generation.

Further, as shown in FIG. 8, when the air gap G2 is not provided, the magnetic equilibrium point of the rotor 41 is 10 degrees. On the other hand, when the size of the air gap G2 is 5.00 × 10 ⁻² mm, the magnetic equilibrium point of the rotor 41 is 52 degrees. Therefore, it can be seen that the magnetic equilibrium point of the rotor 41 can be changed by providing the air gap G2.

According to such an embodiment, the following effects are obtained.
(1) A yoke 42C is laminated and fixed on the magnetic conduction portions 46A and 46B of the stator bodies 42A and 42B so as to straddle the magnetic conduction portions 46A and 46B. The magnetic conduction portions 46A and 46B are installed completely apart from each other, and an air gap G2 having a predetermined size is formed between the side surfaces 461A and 461B. Therefore, the path of the magnetic circuit is composed of a main path that passes through one stator body, the yoke 42C, and the other stator body, and an auxiliary path that passes through one stator body, the air gap G2, and the other stator body. The Rukoto. And compared with the case where the side surfaces 461A and 461B of the magnetic conduction portions 46A and 46B are brought into contact with each other, the cogging torque is greatly reduced without lowering the power generation performance.
Therefore, since the resistance when the rotor 41 rotates can be reduced, the startability of the rotor 41 can be improved.
Further, since the resistance when the rotor 41 rotates can be reduced, the hand movement becomes smooth, the elapsed time can be accurately displayed, and the reliability of the timepiece 1 can be improved.
Furthermore, by reducing the cogging torque, the load torque applied to the train wheel 3 can be reduced, and the durability of the timepiece 1 can be improved.
Since the torque of the mainspring 2 can be reduced by reducing the cogging torque, the mainspring 2 can be reduced in size while maintaining the duration, and the watch 1 can be reduced in thickness and size.
Moreover, since the magnetic equilibrium point of the rotor 41 can be changed by providing the air gap G2, the rotor 41 can be stopped at a position where the meshing efficiency of the train wheel 3 is best.

(2) Since the width of the air gap G2 is set to a size of 1/10 to 1/5 of the thickness of the stator main bodies 42A and 42B, the cogging torque can be reliably reduced.

(3) Since a slight gap is provided between the adjustment screw 65 for fastening the magnetic conduction portions 46A and 46B and the yoke 42C and the adjustment hole 7 into which the adjustment screw 65 is inserted, each magnetic conduction The fixed positions of the portions 46A and 46B can be finely adjusted. Therefore, the width of the air gap G2 can be finely adjusted, and the cogging torque can be more reliably reduced.

(4) Since each of the stator bodies 42A and 42B is formed by laminating amorphous metal layers in multiple layers, the magnetic permeability is very high. Therefore, the power generation performance of the generator 4 can be improved.
(5) The stator notches 451A and 451B of the stator main bodies 42A and 42B are formed in a continuous semicircular arc shape and are not formed with a notch, so that the shapes of the stator main bodies 42A and 42B become complicated. It can suppress and manufacturing cost can be reduced.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the embodiment, nothing is interposed in the gap G2, which is the air gap G2 formed between the magnetic conduction portions 46A, 46B of the stator bodies 42A, 42B, but the permeability is lower than that of the yoke 42C. As long as it has a member, such a member may be interposed in the gap G2. Moreover, in the said embodiment, although the width | variety of the clearance gap G2 was made into the dimension of 1/10 or more and 1/5 or less with respect to the thickness of stator main body 42A, 42B, it is not limited to this.

  In the embodiment described above, the stator main bodies 42A and 42B are made of amorphous metal, but may not be made of amorphous metal, and the stator main body only needs to be made of a ferromagnetic material.

  In the above-described embodiment, the screw holes 64 are formed in the guide pins 61, and the adjustment screws 65 are screwed into the screw holes 64, whereby the magnetic conduction portions 46A and 46B and the yoke 42C are fastened. On the other hand, the first shaft portion 62 of the guide pin 61 is formed longer than the thickness of the magnetic conduction portions 46A, 46B and the yoke 42C, and a male screw is formed at the tip thereof, and the male screw is formed. Each of the magnetic conduction portions 46A and 46B and the yoke 42C may be fastened by screwing a fastening member such as a nut to the tip portion.

The best configuration, method, and the like for carrying out the present invention have been disclosed above, but the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of quantity, other details, and the like.
Therefore, the description limited to the shape, quantity and the like disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

1 is a plan view of a timepiece according to an electronically controlled mechanical timepiece according to an embodiment of the present invention. Sectional drawing of the timepiece of the said embodiment. The block diagram which shows the structure of the timepiece of the said embodiment. The enlarged view of the generator of the said embodiment. The enlarged view of the timepiece which shows the rotor arrangement | positioning part of the said embodiment. FIG. 5 is a cross-sectional view of the timepiece showing the magnetic conduction part of the embodiment, taken along the line VI-VI in FIG. 4. The figure which shows the measurement result of the amount of flux linkages linked to the coil at the time of changing the width | variety of the air gap of the said embodiment. The figure which shows the measurement result of the cogging torque at the time of changing the rotation angle of a rotor in the generator from which the width | variety of the air gap of the said embodiment differs.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electronically controlled mechanical timepiece, 2 ... Mainspring (mechanical energy source), 3 ... Wheel train, 4 ... Generator, 5 ... Control circuit, 41 ... Rotor, 42A, 42B ... Stator body (magnetic circuit forming member), 42C ... yoke (auxiliary magnetic circuit forming member), 43A, 43B ... coil, 45A, 45B ... rotor arrangement part (one end side of magnetic circuit forming member), 46A, 46B ... magnetic conduction part (other end side of magnetic circuit forming member) ), 451A, 451B ... stator notch (notch), 454 ... rotor hole, 461A, 461B ... side, G2 ... air gap (gap).

Claims (6)

A mechanical energy source; a generator that is driven by a train connected to the mechanical energy source to generate power; and the train that is driven by the power generated by the generator and controls a rotation period of the generator. An electronically controlled mechanical timepiece having a control circuit for braking the wheel train and controlling the train wheel,
The generator includes a pair of magnetic circuit forming members having a rotor hole formed on one end side when combined, a rotor having a magnet and disposed in the rotor hole, and the other end of each magnetic circuit forming member An auxiliary magnetic circuit forming member that is laminated so as to straddle the side and magnetically connects the other end sides of the magnetic circuit forming members, and a coil wound around at least one of the magnetic circuit forming members. ,
The other end side of each magnetic circuit forming member is provided apart from each other, and a gap is formed between the side surfaces of the other end side. The electronically controlled mechanical timepiece according to claim 1,
An adjustment hole is formed in the other end side of each magnetic circuit forming member and the auxiliary magnetic circuit formation member, and a guide pin having a diameter smaller than each adjustment hole is inserted into each adjustment hole, An electronically controlled mechanical timepiece, wherein a gap is formed between the adjustment hole and each guide pin. The electronically controlled mechanical timepiece according to claim 1 or 2,
The width of the gap formed between the other end sides of each of the magnetic circuit forming members has a dimension that is 1/10 or more and 1/5 or less of the thickness of the magnetic circuit forming member. Controlled mechanical clock. The electronically controlled mechanical timepiece according to any one of claims 1 to 3,
A notch is formed on one end of each magnetic circuit forming member,
The notches are formed in a continuous semicircular arc shape, and are arranged on the same circumference when the magnetic circuit forming members are combined to form the rotor hole. Mechanical clock. The electronically controlled mechanical timepiece according to any one of claims 1 to 4,
Each of the magnetic circuit forming members is formed by laminating an amorphous metal layer. An electronically controlled mechanical timepiece, wherein: A mechanical energy source, a generator driven by a wheel train connected to the mechanical energy source to generate electric power, driven by electric power generated by the generator, and controlling the rotation period of the generator A method of reducing the cogging torque of the rotor of an electronically controlled mechanical timepiece comprising a control circuit that brakes the train wheel and regulates the train wheel,
When the generator is combined, a pair of magnetic circuit forming members having a rotor hole formed on one end side, the rotor having a magnet and disposed in the rotor hole, and each of the magnetic circuit forming members An auxiliary magnetic circuit forming member that is laminated so as to straddle the end side and magnetically connects the other end sides of the magnetic circuit forming members, and a coil wound around at least one of the magnetic circuit forming members. Comprising the other end side of each magnetic circuit forming member spaced apart from each other, forming a gap between the side surfaces of the other end side,
Each magnetic circuit forming member is configured so that the width of the gap can be adjusted, and the width of the gap is adjusted, or a member having a lower magnetic permeability than the auxiliary magnetic circuit forming member is interposed in the gap. To reduce the cogging torque.

Images