JPH08214510A - Manufacture of stator - Google Patents

Abstract

PURPOSE: To reduce the vibration and noise at operation of a motor by improving the accuracy in the positional relation between the inside diameter of a stator and the hole of a mounting bolt to a casing thereby preventing the misalignment of air gaps of a rotor and a stator. CONSTITUTION: In the manufacture of a stator 1, which is made by a progressive molding device and is equipped with bolt holes 3 in which to insert bolts for mounting to the casing 5 at two or more places of the periphery, the die-cutting of the interior of the stator constituting piece 1a that a rotor constituting piece 2a faces and the die-cutting of the region including the bolt holes 3a are performed in the same station, and a specified number of stator constituting pieces 1a are stacked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator manufacturing method.

[0002]

2. Description of the Related Art A rotor 2 and a stator 1 used in a motor are completed by forming a desired shaped component piece from a strip-shaped strip steel plate by using a progressive die device and polymerizing and laminating it.

FIG. 2 shows a processing state in a progressive die apparatus for punching out a stator component piece 1a for a conventional stepping motor. First, pilot holes are punched at both ends in the width direction of a strip steel plate. An escape hole is punched along the outer periphery of the stator component piece 1a to absorb the subsequent processing strain.

Further, they are transferred at a predetermined pitch based on the pilot holes to form the inner diameter and outer diameter of the rotor component piece 2a, the slot portion of the stator component piece 1a, the tooth portion of the stepping motor, and the like. The outer diameter of the stator component piece 1a is removed.

Both the rotor component piece 2a and the stator component piece 1a are removed in advance in the outer diameter removing step by utilizing a caulking protrusion provided on a part of the iron core component piece that has been extracted into the blanking die. A method of performing integration by fitting with an iron core component is known.

FIG. 3 shows the appearance of the stator 1 and the rotor 2 in the stepping motor. The stator 1 and the rotor 2 thus formed are shown in FIG. Thus, the stepping motor is completed by being fixed in the casing 5.

The casing 5 used here is provided with an opening portion having a bearing 7 for supporting the rotating shaft 6 of the rotor 2 and a bolt hole 3 for fixing and supporting the stator 1, and the rotor portion extends from the opening portion. The rotor 2 and the stator 1 are stored in the casing 5 so that the rotating shaft 6 of the rotor 2 projects, and the stator 1 and the casing 5 are fixed by the bolts 8.

[0008]

However, in the conventional manufacturing method, the bolt holes 3 provided in the vicinity of the outer periphery of the stator 1 and the inner diameter of the stator component piece 1a are punched at different stations of the progressive die. However, there is a problem that the central axis is displaced.

When the stator component piece 1a in which the inner diameter of the bolt hole 3 is displaced is used and the stator component piece 1a is mounted in the casing 5, the rotary shaft 6 of the rotor 2 is replaced by the casing 5
Since it is attached with reference to the shaft hole of, the relative displacement between the rotary shaft 6 of the rotor 2 and the inner diameter of the stator 1 occurs.

In particular, as in a stepping motor, the gap between the inner diameter of the stator 1 and the outer diameter of the rotor 2, which is referred to as the air gap 4, is extremely narrow, so that the positional deviation causes interference between the stator 1 and the rotor 2. Also occurs.

Therefore, in order to prevent such a positional deviation, the bolt hole 3 of the stator 1 is designed to be considerably larger than the bolt size to be used, and the casing 5
After the positional relationship between the shaft hole and the rotary shaft 6 of the rotor 2 is optimally determined, the bolt tightening work is performed.

However, since the above-described air gap 4 is present in the rotor 2 and the stator 1, the air gap 4 that is appropriate for the rotor 2 that has been installed in advance is set.
It was difficult to fix the stator 1 while taking the steps.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and improves the positional accuracy of the inner diameter of the stator 1 and the mounting bolt holes 3 to the casing 5 to improve the rotor 2 and the stator 1. Air gap 4
The purpose is to eliminate the deviation and reduce the vibration and noise during motor operation.

In order to solve the above-mentioned object, the present invention is a method for manufacturing a stator, which is formed by a progressive die apparatus and has bolt holes 3 into which bolts for attaching to a casing 5 are inserted at two or more locations on the outer circumference. It is characterized in that the inner diameter of the stator component piece 1a facing the rotor component piece 2a and the area including the bolt hole 3 are punched at the same station.

Further, in the method of manufacturing the stator 1 for use in the stepping motor, the punching of the tooth portion at the tip of the salient pole portion and the punching of the region including the mounting bolt hole 3 for the casing 5 are performed at the same station. It is characterized by.

[0016]

According to the present invention, since the mounting bolt hole 3 for the casing 5 and the inner diameter of the stator component piece 1 are punched at the same station of the progressive die apparatus,
The positional relationship accuracy between the two is significantly improved, and in particular, a remarkable effect is obtained in a stepping motor in which the gap between the inner diameter of the stator 1 and the outer diameter of the rotor 2, which is referred to as the air gap 4, is minute.

[0017]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. First, a pilot hole necessary for positioning a strip steel plate in a progressive die apparatus is punched out, and the pilot hole is used as a reference to move by a predetermined pitch, and at the next station. The outer diameter of the rotor component piece 2a is punched out.

At the next station, at the same time as the inner diameter of the stator component 1a, part of it is
The bolt hole 3 opened toward the outer peripheral side and the peripheral region thereof are punched. Here, the bolt hole 3 may be a hole whose entire circumference is completely closed, and further, the stator component piece 1a. The area to be punched out at the same time as the inner diameter of is only required to be an area including at least the bolt hole 3.
It is also possible to punch the outer peripheral portion of the stator component piece 1a in the vicinity of to be punched so as to be in a state of being connected and held to the strip-shaped steel plate at a part of the outer periphery of the stator component piece 1a.

At the next station, the slot portion of the stator component piece 1a is punched out to complete the salient pole portion, and at the last station, the outer diameter of the stator component piece 1a is punched out, and a part thereof is provided. The stator 1 is completed by stacking and polymerizing by appropriately selecting known means such as a method of integrally fitting using a caulking projection or a method of laser welding.

[0020]

As described above, according to the present invention, the inner diameter of the stator 1 and the mounting bolt hole 3 for the casing 5 are fixed.
The positional relationship accuracy is improved, and the deviation of the air gap 4 between the rotor 2 and the stator 1 is eliminated, so that a highly reliable motor can be obtained.

[Brief description of drawings]

FIG. 1 is a stamping process diagram of a stator according to an embodiment of the invention.

FIG. 2 is a drawing of a conventional stator punching process.

FIG. 3 is a perspective view showing a general stepping motor.

FIG. 4 is a conceptual diagram showing an inside of a casing of a stepping motor.

[Explanation of symbols]

 1 ... Stator 1a ... Stator component 2 ... Rotor 2a ... Rotor component 3 ... Bolt hole 4 ... Air gap 5 ... Casing 6 ...・ Rotating shaft 7 ・ ・ ・ ・ Bearing 8 ・ ・ ・

Claims (2)

[Claims] 1. A method of manufacturing a stator, comprising a bolt hole into which a mounting bolt for a casing is inserted, formed in a progressive die device, at two or more locations on the outer periphery, the stator constituting piece facing the rotor constituting piece. A method for manufacturing a stator, characterized in that punching of an inner diameter and punching of a region including the bolt hole are performed in the same station, and a predetermined number of the stator constituent pieces are superposed and laminated. 2. A method of manufacturing a stator for use in a stepping motor, which is formed by a progressive die apparatus and has bolt holes into which mounting bolts for a casing are inserted at two or more locations on the outer periphery, the method comprising the steps of: A method for manufacturing a stator, comprising: punching out a tooth portion located at a tip of a salient pole portion and punching out a region including the bolt hole at the same station, and stacking a predetermined number of the stator constituent pieces by polymerizing.