JPH0127403Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stator for a small motor used in electronic watches and the like.

Conventionally, as electronic watches have become smaller, step motors have been integrally constructed with resin upper and lower plates having shaft holes for the second hand wheel, transmission wheel, etc.

That is, as shown in FIGS. 1 and 2, the rotor 1 of the motor includes a substantially arc-shaped magnetic flux generating portion 5 of a pair of stators 3 and 4 fixed to an upper base plate 2.
and one shaft 1 of the rotor 1
A was supported by an upper bearing 6 fixed to the upper base plate 2 by riveting or the like. Further, the other shaft 1b of the rotor 1 was supported in a shaft hole formed in the base plate 7.

However, in order to improve the performance of the motor, it is necessary to completely accommodate the rotor 1 in the center position of the magnetic flux generating part 5 of the stators 3 and 4. Magnetic flux generation section 5
It is very difficult to assemble the motor so that the center position of the motor is concentric with the center of the shaft hole of the base plate 7, and this also causes problems in quality control and furthermore causes a decline in the performance of the motor. Ta.

The present invention provides a stator for a watch motor in which an upper bearing is integrally molded with the stator in order to eliminate the above-mentioned drawbacks, have a simple structure, and improve motor performance.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, based on Figures 3, 4, and 7,
An embodiment will be described, and the same parts as those of the conventional one will be given the same reference numerals, and the explanation thereof will be omitted.

Reference numeral 8 denotes a stator made of electromagnetic mild steel and formed into a plate shape that also functions as a top plate.The stator 8 is formed with a magnetic flux generating portion 9 having a substantially arc-shaped hole. A freely rotatable rotor 1 is housed in the rotor 1.

In the stator 8, narrow parts 10 and 10' are formed outside the substantially circular arc-shaped hole of the magnetic flux generating part 9 in a mutually opposing position, and these parts are immediately saturated with a small amount of magnetic flux. The stator 8 is magnetically separated by the narrow portions 10, 10'.

By supplying an inversion pulse signal to a drive coil (not shown), the stator 8 is magnetized with opposite polarities on both sides of the narrow width portions 10, 10'.

The magnetic flux generating portion 9 is provided with cutout portions 11 and 11' having a desired width in a mutually opposing positional relationship. These notches 11, 11' determine the resting position of the rotor when the rotor is not energized to the position shown in the figure, but in this case, it is also possible to separately determine the resting position using a magnetic piece or the like. However, it is not essential.

Reference numeral 12 denotes a bearing portion having a shaft hole 12a for rotatably supporting one shaft 1a of the rotor 1.

This bearing portion 12 is located at one end 8a of the stator 8.
Connect the plate piece protruding from the rotor 1 to one shaft 1a of the rotor 1.
The shaft hole 12a is bent into an angled shape so as to have a height X that supports the shaft hole 12a and to be coaxial with the center of the magnetic flux generating section 9.

Therefore, the rotor 1 is connected to the bearing part 1 of the stator 8.
One shaft 1a is rotatably supported on the base plate 2, and the other shaft 1b, which is the side having the gear, is rotatably supported on the base plate 7, and the center of the magnetic flux generating portion 9 of the stator 8 and the rotor They are accommodated with the center of 1 being concentric.

Next, a second embodiment will be described based on FIGS. 5 and 6. Parts similar to those of the first embodiment are given the same reference numerals, and their explanation will be omitted.

Reference numeral 13 denotes a bearing portion having a shaft hole 13a for rotatably supporting one shaft 1a of the rotor 1.

This bearing part 13 is constructed by attaching a plate piece bored from one of notches 11 and 11' formed in the magnetic flux generating part 9 of the stator 8 to one shaft 1a of the rotor 1.
The shaft hole 13a is bent into an angled shape so that the shaft hole 13a is coaxial with the center of the magnetic flux generating section 9.

In this embodiment, the bearing part 13 is not limited to being formed by integrally bending only one of the notch parts 11, but is also integrally formed with both the notch parts 11, 11' and being folded and formed by drawing or the like. It may be something.

Furthermore, the bearings 12 and 13 are not limited to those in the first and second embodiments, but may be formed integrally by bending and forming a part of the stator 8 at a desired location.

Furthermore, although the stator in the first and second embodiments also serves as a top plate, a pair of stators may be fixed to the top plate as in the conventional example.

The rotor 1 is rotatably supported by bearings 12 and 13 integrally formed with the stator 8 and by the base plate 7, and is also rotatably supported by an inverted pulse signal supplied to a drive coil (not shown). Therefore, both sides of the stator 8 are magnetized with different polarities with the narrow width portions 10 and 10' as boundaries.

The rotor 1 accommodated in the magnetic flux generating section 9 of the stator 8 is rotated by the magnetic flux generated by the magnetic flux generating section 9.

Since it has the above structure and operation, the following effects are achieved.

By integrally molding the bearing that supports one shaft of the rotor with the stator, the center position of the magnetic flux generating part of the stator and the shaft hole of the bearing are made concentric, resulting in a simple configuration and easy assembly. , and can significantly improve the performance of the motor.

[Brief explanation of the drawing]

Figure 1 is a plan view of a conventional watch motor assembly, Figure 2 is a sectional view taken along the arrow line A-A in Figure 1, and Figure 3
The figure is a plan view showing the first embodiment of the stator for a watch motor according to the present invention, FIG. 4 is a sectional view taken along the arrow line B-B in FIG. 3, and FIG. FIG. 6 is a sectional view taken along the arrow line CC in FIG. 5, and FIG. 7 is a plan view showing the second embodiment of the stator for a watch motor according to the present invention FIG. 2 is a partially sectional assembly diagram of the motor part of the watch. DESCRIPTION OF SYMBOLS 1...Rotor, 8...Stator, 9...Magnetic flux generation part, 11, 11'...Notch part, 12,
13...Bearing portion, 12a, 13a...Shaft hole.

Claims (1)

[Claims for Utility Model Registration] (1) A bearing part having a shaft hole for supporting one shaft of the rotor is provided in the stator at a position concentric with a substantially arc-shaped magnetic flux generating part that accommodates the rotor in the stator. A stator for a watch motor, characterized by being constructed by bending and molding a part of the stator. (2) A stator for a timepiece motor according to claim 1, wherein the bearing portion is formed by bending and forming an end portion of the stator. (3) A stator for a timepiece motor according to claim 1, wherein the bearing portion is formed by bending and forming a notch formed in the magnetic flux generating portion of the stator.