JPS604660B2 - Manufacturing method of stator for electronic watch motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a stator for a motor for an electronic timepiece, and more particularly to a method for processing a connecting portion of an integrally formed stator.

BACKGROUND ART Conventionally, a stator of a motor for an electronic watch is composed of two parts, and left and right field poles of the stator face each other with an air layer in between.

This air layer plays an important role in obtaining the effective magnetic flux number of the drive magnetic circuit to the rotor magnetic poles, but in terms of rough fixation to the movement, because the stator is made of two pieces, The stator adjustment position may shift due to the impact, causing the optimal adjustment of the stator to go awry, or when both stators are combined, the inner diameter size may differ greatly due to variations in machining, resulting in inconvenience, or the tip of the stator. There are various drawbacks such as the delicate processing of the parts. In addition, with recent improvements in processing technology, it has become possible to integrally construct a pair of stator field poles through a connecting portion with an extremely small width, but this connecting portion is quickly Since it must be saturated, it is generally processed to a width of 0.25 or less.

To do this, a press for punching out the outer shape of the stator, a press for punching out the inner shape, and a press for blanking out the rotor housing had to be carried out in sequence, which required a large number of press processing steps, and furthermore, due to the limitations of processing capacity. Therefore, there are many difficult problems in terms of machining yield, machining accuracy, variations in stator performance, and machining costs. The present invention has been made to eliminate the above-mentioned drawbacks and problems, and provides a method for manufacturing a stator that not only ensures magnetic stator performance but also facilitates processing and achieves a significant cost reduction. With the goal. The present invention will be explained in detail below with reference to embodiments shown in the drawings.

FIG. 1 is a plan view of an integrated stator according to an embodiment of the present invention, in which a hole 2 for accommodating a rotor 3 is provided approximately in the center of the stator 1, and then mechanical strain is applied to the stator connecting portions 4, 4. Indicates the condition. The process of forming the holes 2 in the stator 1 is a general press punching process, but since the width of the stator connecting part 4 is larger than that of the conventional method, it is a lot of work that involves repeating the rough punching press of the storage holes and the finishing punching press as in the conventional method. The entire shape can be completed with almost one press punch without any pressing process. Further, as a process for imparting mechanical strain to the connecting portion 4, as shown in FIG. 2, only the connecting portion is pressed with a die tool to form a shallow recess 4a (coining);
Alternatively, a semi-shearing process can be considered in which a die is applied to the lower surface of the stator 1 and a punch is applied to the upper surface to apply shearing stress to the connecting portion 4 to form a concave portion 4a and a convex portion 4b as shown in FIG. Both coining processing and semi-shearing processing can be referred to as pressing processing. These processes shown in Figures 2 and 3 are possible because the stator 1 is made of a soft magnetic material, and can be done by simply pressing only the connecting part 4 and creating mechanical strain by plastically deforming it. Therefore, it is clear that even in the integrated stator that is the object of the present invention, the mechanical strength of the connecting portion 4 is not impaired and the workability is good.

As mentioned above, the stator coupling part 4 subjected to mechanical strain has a high magnetic resistance and a low saturation magnetic flux density. Therefore, when magnetic flux is generated in the stator 1 as shown by the arrow in FIG. The magnetic flux is quickly saturated.

Since the magnetic flux saturated connecting portion 4 acts in the same way as an air gap,
Magnetic flux is also generated within the rotor hole 2, and the rotor 3 can rotate in the direction of the arrow as shown in FIG. As described above, according to the present invention, magnetic flux saturation of the joint can be quickly achieved by applying mechanical strain to the joint of the integrated stator, so that the cross-sectional area of the joint can be increased. Is possible.

Therefore, the stator shape including the loader storage hole 2 can be formed without performing many presses as in the conventional method, so the stator processing can be performed easily and at low cost without impairing the rotor driving ability and mechanical strength of the stator. It has an effect that can be achieved at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a stator according to an embodiment of the present invention, and FIG.
The figure is a partial side view of FIG. 1, and FIG. 3 is a partial side view of a stator according to another embodiment of the present invention. 1. Stator, 2. Hole for storing the rotor, 3. ．．・．． ...Rotor, 4...Stator connection portion, 4a...Concave portion, 4b...Protrusion. Tsutomu's brother 2nd cape 3rd cape

Claims (1)

[Claims] 1. Providing a rotor storage hole in a part of the stator,
A method for manufacturing a stator for a motor for an electronic watch, comprising the step of applying mechanical strain to the stator connection portion sandwiching the hole by pressing to increase magnetic resistance and to facilitate magnetic flux saturation.