JPS6159059B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for fixing a stator of a small synchronous motor.

As an example of a small synchronous motor, one constructed as shown in FIG. 1 is known. That is, a second stator 2 having a cylindrical shape with a bottom is press-fitted into the center of the first stator 1 having a cylindrical shape with a bottom, and a second stator 2 having a cylindrical shape with a bottom is press-fitted into an opening of the first stator 1. A flat cover 3 is attached. 1st and 2nd
An annular excitation coil 4 is connected between the stators 1 and 2 of the first
and the second stators 1 and 2. A permanent magnet rotor 5 is rotatably provided within the excitation coil 4 via a shaft 6.
The rotation of the rotor 5 is transmitted to the output shaft 8 via a reduction gear mechanism 7 disposed between the second stator 2 and the cover 3.

By the way, when press-fitting and fixing the second stator 2 into the first stator 1, it is necessary to fix the second stator 2 in a predetermined manner, so a press-fitting device as shown in FIG. 2 has conventionally been used. To explain this,
It consists of a fixed jig 11 and a movable jig 12.
The fixing jig 11 is provided with protrusions 14 that correspond to holes 13 provided at a plurality of predetermined locations on the bottom plate 1a of the first stator 1. On the other hand, the movable jig 12 is provided with rods 16 that are movable up and down and correspond to holes 15 provided at a plurality of predetermined locations in the bottom plate 2a of the second stator 2. is urged downward by a spring 17. Further, a permanent magnet 18 is provided at a predetermined location below the movable jig 12. When press-fitting and fixing the second stator 2 into the first stator 1, first, by engaging the holes 13 of the first stator 1 with the protrusions 14 of the fixing jig 11, The stator 1 is set in a fixing jig 11 in a predetermined manner. Also, the hole 15 of the second stator 2 is engaged with the rod 16 of the movable jig 12, and the bottom plate 2a of the second stator 2 is attached to the permanent magnet 1 to prevent it from falling.
8, the second stator 2 is set in a predetermined manner on the movable jig 12. Next, the movable jig 12 is lowered, thereby lowering the second stator 2.
are press-fitted into the first stator 1 until the excitation coil 4 is sandwiched between them, and the second stator 2 is thus press-fitted and fixed into the first stator 1. In the press-fitting step, when the rod 16 comes into contact with the excitation coil 4, the rod 16 then moves up relatively against the force of the spring 17.

However, in such a conventional press-fit fixing method, the plate thickness of the first stator 1 is quite thin, about 0.8 mm, and therefore the protrusions 14 of the fixing jig 11
Since the length can be only about 0.8 mm, it is difficult to engage the holes 13 of the first stator 1 with the protrusions 14 of the fixing jig 11, and as a result, the first stator 1 cannot be attached to the fixing jig. Compared to No. 11, it had the disadvantage that it was difficult to set it in a predetermined manner. Furthermore, when setting the second stator 2 on the movable jig 12, it is necessary to engage the plurality of holes 15 of the second stator 2 with the rods 16 from below, which makes the work difficult. The drawback was that it was quite troublesome. Further, due to the above-mentioned drawbacks, it is difficult to automate such press-fitting and fixing work. Furthermore, there was a drawback that the configurations of the fixed jig 11 and the movable jig 12 were complicated and the cost was high.

The present invention has been made in view of the above circumstances, and it is possible to extremely easily set the first and second stators in a predetermined manner, it is also possible to automate the setting, and furthermore, the configuration of the press-fitting jig can be simplified. It is an object of the present invention to provide a method for fixing a stator of a small synchronous motor that can be used to fix a stator of a small synchronous motor.

Hereinafter, one embodiment of the present invention will be explained in Figures 3 to 7.
This will be explained with reference to the figures. In addition, in this example, the same reference numerals are attached to the parts with the same names as in the above conventional example,
A part of the explanation will be omitted. In this embodiment, the fixed jig 11 is not provided with any conventional protrusions, and the movable jig 12 is not provided with any conventional rods, springs, or permanent magnets. do not have. Instead, a plurality (two or more) of notches 21 are provided at the end of the side wall 1b of the first stator 1, as shown in FIG. As shown in FIG. 5, a protrusion 22 is provided on the outer periphery of the stator 2 of No. 2 by cutting out the side wall 2b and bottom plate 2a and extending outward in parallel with the bottom plate 2a.

Therefore, when press-fitting and fixing the second stator 2 into the first stator 1, first the first stator 1 is simply set in a predetermined position on the fixing jig 11, and then this first stator By engaging the protrusion 22 of the second stator 2 with the notch 21 of the stator 1 and positioning the stators 1 and 2 relative to each other, the second stator 2 is placed on the first stator 1. set in a predetermined manner. Next, the movable jig 12 is lowered, whereby the second stator 2 is press-fitted into the first stator 1 until the excitation coil 4 is sandwiched therebetween, and thus the second stator 2 is inserted into the first stator 1. Press-fit and fix into the stator 1 of. In the press-fitting step, the protrusion 22 of the second stator 2 is bent by contacting the side wall 1b of the first stator 1, as shown in FIGS. 6 and 7. 1b, and therefore, even if the protrusion 22 initially protrudes outward from the side wall 1b of the first stator 1, no problem will arise.

As explained above, according to the stator fixing method for a small synchronous motor according to the present invention, the protrusion provided on the outer circumference of the second stator is inserted into the notch provided on the side wall end of the first stator. The second stator is then press-fitted into the first stator, and the protrusion is bent to align the first stator with the second stator. Since it is located within the side wall, both stators can be set in a predetermined manner very easily, and since the second stator can be set on top of the first stator, automation is also possible. Furthermore, there is no need to provide the press-fitting jig with anything for positioning the stators relative to each other, and the configuration of the press-fitting jig is therefore simplified.
This has effects such as being able to reduce the cost.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view showing an example of a small synchronous motor, Fig. 2 is a longitudinal side view showing a conventional stator fixing method, and Fig. 3 is a longitudinal side view showing an example of the method of the present invention. 4 is a perspective view showing a part of the first stator, and FIG. 5 is a side view showing a part of the first stator.
FIGS. 6 and 7 are perspective views showing a part of the second stator. 1...First stator, 2...Second stator, 4
... Excitation coil, 5 ... Permanent magnet rotor, 11 ...
...Fixed jig, 12...Movable jig, 21...Notch, 22...Protrusion.

Claims (1)

[Claims] 1. A first cylindrical stator with a bottom that houses a permanent magnet rotor and an excitation coil disposed around the permanent magnet rotor has a second cylindrical stator with a bottom that holds the excitation coil. When press-fitting and fixing the stator, a plurality of notches are provided at the end of the side wall of the first stator, and the side wall is cut out in the outer circumference of the second stator in correspondence with these notches. A protrusion extending outward parallel to the bottom plate is provided,
The first and second stators are positioned relative to each other by engaging the protrusion with the notch, and then the second stator is press-fitted into the first stator and attached thereto. A method for fixing a stator for a small synchronous motor, characterized in that the protrusion is bent and positioned within a side wall of the first stator.