JP3432680B2 - Clock synchronous motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronous motor used for a movement for driving hands of a timepiece.

[0002]

2. Description of the Related Art Today, movements for timepieces are shown in FIG.
As shown in FIG. 2, a timepiece synchronous motor in which a coil 13 is wound around a U-shaped stator 11 and a rotor housing portion 15 is formed so as to sandwich the rotor near an open end 17 of the stator 11 is often used. The synchronous motor for a timepiece is a synchronous motor that rotates a rotor at a predetermined angle for each pulse by applying a drive current that is precisely controlled to 8 Hertz by using a crystal oscillator. The rotor accommodating portion 15 is formed by a notch adapted to the rotor.

The rotor housing portion 15 is slightly asymmetrical with respect to the central axis of the stator 11 so that when the current is passed through the coil 13, the rotor starts to rotate by itself. Further, in recent years, various movements for timepieces have been devised in order to extend the battery life, and improvements have been made to reduce the power consumption of a synchronous motor used for the movement.

As shown in FIG. 13, such a low power consumption type synchronous motor is configured such that both ends of the stator 11 which are opening ends 17 are connected by a connecting plate 20 made of a soft magnetic material to generate a magnetic field generated in the coil 13. There is a method in which the flow path of is a continuous closed magnetic path (for example, Japanese Utility Model Laid-Open No. 62-140878). This connecting plate
Since 20 is joined to the open end 17 of the stator 11 to form a closed magnetic path, the magnetic flux from the stator 11 is a connecting plate.
It is necessary to prevent a large magnetic resistance from being generated in the contact surface portion between the connecting plate 20 and the stator 11 when it is transmitted to the stator 20. The connecting plate 20 was directly contacted with the stator 11 and spot welding or the like was performed to integrally join the connecting plate 20 with the stator 11.

[0005]

As described above, if spot welding is performed when the connecting plate and the stator are integrally joined, the connecting plate and the stator may be warped or warped due to the impact of welding. Sometimes. For this reason, there is a drawback that the opening size of the stator varies, and it becomes difficult to mass-produce a motor having a predetermined rotational torque.

Further, spot welding of a connecting plate of a small synchronous motor for a timepiece complicates the equipment and makes it difficult to mass-produce the synchronous motor at low cost.

[0007]

SUMMARY OF THE INVENTION The present invention has a U-shaped stator having a stator coil, a rotor accommodating portion in the stator gap, and a connecting plate for connecting the open end portions of the stator. A synchronous motor for a timepiece having an adhesive application portion on a part of a contact surface between a connecting plate and a stator.

Thus, since the adhesive application portion is provided on a part of the contact surface, it is possible to leave a portion where the connecting plate of the soft magnetic material and the stator are in direct contact with each other, and to prevent the formation of the closed magnetic path. There is no. Then, the connecting plate and the stator can be easily connected and fixed with an adhesive. That
According to the invention described in claim 1 , a groove portion reaching an end surface of the connecting plate is formed on a plane which is a contact surface of the connecting plate with the stator, and an adhesive application portion is formed on a part of the contact surface with the stator. To do.

As described above, since the groove is used as the adhesive application portion, the adhesive is injected into the groove so that the adhesive does not spread over the entire contact surface, and the connecting plate and the stator are reliably connected by the adhesive. It can be fixed, and the connecting plate and the stator can be brought into contact with each other with a predetermined area without an adhesive. Further, in the invention described in claim 2 , a connecting plate is formed with a bent portion to form a connecting plate having a plane orthogonal to the contact surface with the stator, and one plane of the orthogonal planes is an adhesive application portion. Is.

As described above, a bent portion is formed on the connecting plate to form a connecting plate having a plane orthogonal to the contact surface with the stator, and if one of the flat surfaces is the adhesive applying portion, the adhesive spreads on the other flat surface. It is difficult, and it is possible to easily maintain the joint between the connecting plate to which the adhesive is not applied and the contact portion of the stator, and to secure the predetermined contact area and join the connecting plate and the stator. it can.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, a synchronous motor for a timepiece according to the invention has an open end portion of a U-shaped stator 11.
The connecting plate 20 is joined to 17 to connect both open end portions 17. As shown in FIG. 2, the connecting plate 20 is made of a soft magnetic steel plate such as permalloy having a proper thickness in the form of a rectangle. The contact portions 25 are formed by using the respective ranges as contact surfaces for joining with the stator 11.

A groove 27 is formed in each of the contact portions 25 serving as the contact surface, and the groove 27 is formed as a groove 27 that opens in the long end face 21 which is the long side of the connecting plate 20. Is. Therefore, the opening of this groove 27 is
This connecting plate 20 is directed toward the end portion of the opening 11 of the opening 11.
When is overlaid on the stator 11, as shown in FIG. 3, the connecting portion 20 of the contact surface allows the connecting plate 20 and the stator 11 to directly contact with each other to open the groove portion 27 to the outside.

As described above, the connecting plate 20 is overlapped with the stator 11 at a required position, the connecting plate 20 and the stator 11 are pressed against each other, and the groove portion 27 serves as the adhesive application portion 26.
If the adhesive is injected from the opening portion of 27, the connecting plate 20 and the stator 11 can be easily joined together by the adhesive. Then, when the connecting plate 20 and the stator 11 are pressed against each other, it is sufficient to press them by static pressure without applying an impact, so that the connecting plate 20 and the stator 11 are distorted such as bending. The connecting plate 20 and the stator 11 can be securely and easily integrated with each other.

If the connecting plate 20 and the stator 11 are integrally pressure-bonded to each other and the adhesive is injected into the groove 27 to apply the adhesive, the adhesive protrudes from the groove 27 to form the contact portion 25. The contact surface having a predetermined area directly contacts the connecting plate 20 and the stator 11 so as to ensure the contact, and does not prevent a magnetic path from being formed when the connecting plate 20 and the stator 11 are joined. Connect plate 20 and stator 11
And can be integrated.

Needless to say, the stator 11 is provided with the stator coil 13 and the rotor accommodating portion 15 as in the conventional case. The groove 27 formed in the connecting plate 20 is not limited to the case where it is opened to the long end face 21 as shown in FIG. 2, but the short sides of both ends of the connecting plate 20 are formed as shown in FIG. The short end face 23 may be opened.

Further, as the groove 27, a groove 27 continuous from the short end face 23 of the connecting plate 20 to the other short end face 23 is provided across the contact portion 25, or as shown in FIG.
A groove 27 extending from the long end face 21 to the long end face 21 may be provided near the end of the connecting plate 20 so as to cross each contact portion 25 formed on both sides of the connecting plate 20. Then, as another embodiment, as shown in FIG. 6, a step portion 37 is provided at the center of the connecting plate 20, and bent portions 31 are formed at both ends of the step portion 37.

In this connecting plate 20, the planes of the contact surfaces at both ends, which are the contact surfaces, are parallel to the plane of the step portion 37, and the bent portion 31 is perpendicular to the plane of the contact portion 25. The distance between the two bent portions 31 of the connecting plate 20 is set to the stator 11
This is made to coincide with the interval at the open end 17 of. Therefore, as shown in FIG. 7, the step portion 37 is sandwiched between the stators 11 and the outer side surfaces of both the bent portions 31 are used as contact surfaces, and
A flat surface portion located outside the both bent portions 31 is also a contact surface.

In this way, a contact surface having a plane orthogonal to each other is formed by the outer side surfaces of the both bent portions 31 and the planes in the vicinity of both ends of the connecting plate 20, and the outer side surfaces of the both bent portions 31 are applied with the adhesive agent. 26, and a flat surface on the end side of both the bent portions 31 is a contact portion 25 that directly contacts the stator 11. Therefore, in this connecting plate 20, since the distance between the both bent portions 31 is made equal to the distance at the opening end portion 17 of the stator 11, the step portion 37 is sandwiched between the stator 11 and the adhesive applying portion is formed.
It is possible to join the connecting plate 20 and the stator 11 by the outer surface of the bent portion 31 formed as 26 and to directly contact the contact portion 25 with the stator 11 to form a magnetic path that connects both open end portions 17 of the stator 11. it can.

Further, as described above, the gap between the bent portions 31 is made to coincide with the gap between the opening end portions 17 of the stator 11, and the adhesive applying portion is formed.
If the bent portion 31 is bonded and fixed near the opening end 17 of the stator 11, the stator 11 having a constant gap between the stators 11 can be easily manufactured. Then, an adhesive is applied to the bent portion 31 which is the adhesive applying portion 26, and the contact surfaces to be the contact portions 25 formed at both ends of the connecting plate 20 are stators.
When pressed against 11, the connecting plate 20 has a predetermined contact area without the adhesive protruding to the contact surface which is the contact portion 25.
It is easy to integrally join and fix the stator 11 and the stator 11, and further, the contact portion 25 to which the adhesive is not applied has the stator 11
Since the direction away from is the direction in which the adhesive application portion 26 is not bonded, there is also an advantage that a gap is less likely to occur between the contact portion 25 of the connecting plate 20 and the stator 11.

It should be noted that both end portions of the connecting plate 20 parallel to the step portion 37 may be adhesive application portions 26, and outer side surfaces of both bent portions may be contact portions 25 of the stator 11. Further, when forming the bent portion, as shown in FIG. 8, both side ends, which are short sides of the connecting plate 20, may be bent at right angles to form a bent portion 32. In this case, as shown in FIG. 8, it is not limited to the case where the inside of both the bent portions 32 is the adhesive application portion 26 and the vicinity of the folded portion 32 is the contact portion 25.
In some cases, the contact surface 25 and the contact portion 25 are reversed, and the inner surface of the bent portion 32 is used as the contact portion 25 and the adhesive application portion 26 is provided near the bent portion 32.

Also in this case, the manufacturing accuracy of the stator 11 is kept constant by adjusting the gap of the bent portion 32 to the width of the stator 11 so that the outer width of the stator 11 is made constant by the bent portion. be able to. Further, when forming the bent portion, as shown in FIG. 9, the bent portion 33 may be formed by bending a part of the connecting plate 20 so that the cutout holes 39 are provided at two positions of the connecting plate 20.

In this case, a U-shaped cut portion is formed on the connecting plate 20, and the cut portion is bent at a continuous portion at a right angle to the connecting plate 20 to form a notch hole 39 and the bent portion 33.
The gap between the two bent portions 33 is matched with the gap between the stators 11. In this way, by forming the bent portion 33, a contact surface having two orthogonal planes is formed, and one is the contact portion 25 and the other is the adhesive application portion 26. Therefore, the adhesive is the entire contact surface. It is possible to form a magnetic path by directly contacting one flat surface of the connecting plate 20 having a required area with the stator 11 without spreading the entire contact surface to the stator 11 via an adhesive agent. it can.

Further, as another embodiment, as shown in FIG. 10, a bent portion 34 is formed along the end face 21 which is the long side of the connecting plate 20, and the opening of the stator 11 is opened as shown in FIG. The connecting plate 20 has a contact surface with two planes orthogonal to the plane surface near the end 17 and the end surface of the opening end 17. Therefore, the inside of the bent portion 34 is attached to the adhesive applying portion 26.
Or a contact portion 25, and a magnetic path can be formed by joining a part of the connecting plate 20 so as to directly contact the stator 11.

In each of the embodiments of the present invention, since the connecting plate 20 and the stator 11 are joined by an adhesive, when the motor fails, a strong external force is applied to the connecting plate 20.
It is also possible to peel off from the stator 11, and there is also an advantage that disassembly and repair and diversion of parts are possible.

[0025]

According to the present invention, in a synchronous motor having a stator coil and a rotor housing in a U-shaped stator and a connecting plate at the open end of the stator, a part of the contact surface between the connecting plate and the stator is provided. This is a synchronous motor for a timepiece which is an adhesive application section. Therefore, since the joining of the connecting plate and the stator is facilitated and an adhesive is used for a part of the contact surface,
Since the magnetic path can be reliably formed and the connecting plates can be joined without giving an impact during the manufacture of the synchronous motor,
It is a synchronous motor for a timepiece, which does not cause distortion in a stator or the like and has excellent mass productivity.

Further, the present invention is a synchronous motor for a timepiece in which a groove portion reaching the end surface of the connecting plate is formed on the contact surface of the connecting plate with the stator to serve as an adhesive application portion. Therefore, the adhesive that is injected into the groove opening at the end face and applied is not allowed to stick out over the entire contact surface with the stator, but a portion of the contact surface is adhered with the adhesive to securely join the connecting plate and the stator. In addition, the magnetic path can be reliably formed.

The present invention is a synchronous motor for a timepiece in which a bent portion is formed in a connecting plate to form a connecting plate having a plane orthogonal to a contact surface with a stator, and an adhesive is applied to one of the orthogonal planes. . Therefore, the adhesive does not overflow the entire contact surface with the stator, and a part of the contact surface is adhered with the adhesive to securely join the connecting plate and the stator, and the contact portion between the connecting plate and the stator. It is possible to firmly maintain the contact in and to reliably maintain the formation of the magnetic path.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of a timepiece synchronous motor according to the present invention.

FIG. 2 is a perspective view showing a connecting plate used in the first embodiment of the synchronous motor for a timepiece according to the invention.

FIG. 3 is a side view showing the first embodiment of the timepiece synchronous motor according to the invention.

FIG. 4 is a perspective view showing a connecting plate used as a second embodiment of the synchronous motor for a timepiece according to the invention.

FIG. 5 is a perspective view showing a connecting plate used as a third embodiment of the synchronous motor for a timepiece according to the invention.

FIG. 6 is a perspective view showing a connecting plate used as a fourth embodiment of the synchronous motor for a timepiece according to the invention.

FIG. 7 is a plan view showing a fourth embodiment of the timepiece synchronous motor according to the present invention.

FIG. 8 is a perspective view showing a connecting plate used as a fifth embodiment of the timepiece synchronous motor according to the present invention.

FIG. 9 is a perspective view showing a connecting plate used as a sixth embodiment of the synchronous motor for a timepiece according to the invention.

FIG. 10 is a perspective view showing a connecting plate used as a seventh embodiment of the timepiece synchronous motor according to the present invention.

FIG. 11 is a plan view showing a seventh embodiment of the timepiece synchronous motor according to the invention.

FIG. 12 is a plan view showing an example of a conventional timepiece synchronous motor.

FIG. 13 is a plan view showing another example of a conventional timepiece synchronous motor.

[Explanation of symbols]

Reference Signs List 11 stator 13 stator coil 15 rotor housing 17 opening end 20 connecting plate 21 long end 23 short end 25 contact part 26 adhesive application part 27 groove part 31, 32, 33, 34 bent part 37 step part 39 notch hole

Continuation of front page (56) Reference JP-A-51-99215 (JP, A) JP-A-55-49956 (JP, A) JP-A-50-132409 (JP, A) JP-A-52-103614 (JP , A) Actual development 62-140878 (JP, U) Actual development 60-93462 (JP, U) Actual public 34-20112 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) H02K 1/14 G04C 15/00 H02K 21/18 H02K 37/16

Claims (2)

(57) [Claims] Having 1. A stator U-shaped stator having a coil, and, along with having a rotor accommodating portion in the gap of the stator, in a synchronous motor having a connecting plate connecting the open end of the stator, connecting plate With the stator in
On the plane that is the contact surface, have a groove that reaches the end surface of the connecting plate.
A synchronous motor for a timepiece, characterized in that it has an adhesive application section formed on a part of a contact surface between the connecting plate and the stator, with the groove section of the above as an adhesive application section. 2. A U-shaped stay provided with a stator coil.
The rotor storage part in the stator gap.
And has a connecting plate that connects the open end of the stator.
In a synchronous motor that has a
A connecting plate having a plane perpendicular to the contact surface of the data.
I, one of the plane of the plane perpendicular to the adhesive application unit
Adhesive formed on part of the contact surface between the connecting plate and the stator
Watch synchronous motor you further comprising a coating unit.