JPS6188748A - How to assemble a stepping motor - Google Patents

Abstract

PURPOSE:To reduce the quantity of components and facilitate the working, by combining the outer periphery and inner periphery for stator core assembly with brackets. CONSTITUTION:Brackets 13, 13' are inserted with the gap 3 between the stator core assembly 1 and the rotor 2 of a stepping motor and by processing the both end outer peripheries 12, 12' of the core assembly 1 based on the inner periphery of the core assembly 1. Bearings 7 provided for the centers of the brackets 13, 13' are combined with the rotor 2 via shaft 8. As the result, the both end outer peripheries 12, 12' of the core assembly 1 are easily processed at the same time on the basis of the inner periphery of the core assembly 1, and the gap 3 can be uniformly formed with high precision.

Description

DETAILED DESCRIPTION OF THE INVENTION An object of the present invention is to uniformly combine the stator core assembly and the circumferential gap between the rotor and the stator core assembly with high precision without using any parts other than the placket.

Conventionally, such combinations use parts such as frames,
The structure was such that the stator core assembly and the frame were machined in the same way, and the frame and the placket were assembled concentrically to equalize the gap in the circumferential direction between the stator core assembly and the rotor. Accuracy errors related to this accumulated, making it extremely difficult and difficult to make the voids uniform.

FIG. 1 shows a conventional row, which includes a core having a large number of straight protrusions on the inner circumferential surface, a stator core assembly 1 consisting of windings,
The gap 3 with the rotor 2 is created by press-fitting the stator core assembly 1 into the inner diameter of the frame 4, fixing it by adhesive, etc. 5' machining and placket on the machined surface) 6
, 6' are inserted, and the rotor 2 is assembled via the shaft 8 to a bearing 7 installed at the center of the brackets 6 and 6' to achieve uniformity. However, when fixing the frame 4 and the stator core assembly 1, there is a misalignment of the centers of both parts, and when machining the spigot parts 5 and 5' at both ends of the frame 4, it is difficult to simultaneously process both ends with respect to the inner periphery reference of the stator core assembly 1. It has been difficult to make the voids 3 uniform with high accuracy due to machining dimensional errors caused by. In addition, the number of parts and processing parts are large, and the cost is very high.

FIG. 2 shows a conventional eilJ that makes the air gap uniform without using any parts other than a placket. Components having the same structure as those in FIG. The gap 3 between the stator core assembly 9 and the rotor 2 is created by inserting a placket 11° 11' having a bearing 7 into the inner circumferential reference combination surfaces 10 and 10' of the stator core assembly 9, and assembling the rotor 2 via the shaft 8 to create a uniform space. We are trying to Although the stepping motor having such a structure can make the air gap 3 uniform, it has the disadvantage that the thickness of the stator core assembly 9 increases and the total length of the motor increases.

FIG. 3 shows a stepping motor according to the present invention, in which the gap 3 between the stator core assembly 1 and the rotor 2 is created by machining the outer circumferential surfaces 12 and 12' at both ends of the stator core assembly 1 based on the inner circumferential surface of the stator core assembly 1. , Insert the platen) 13, 13' into the processed surface, and insert the platen) 13,
13' via a shaft 8 to a bearing 7 installed at the center of the
The rotor 2 is combined to achieve uniformity.

Continuing the above explanation, the outer peripheral surface 12 at both ends of the stator core assembly 1
, 12' can be easily machined at both ends simultaneously with reference to the inner circumferential surface of the stator core assembly 1, and the gap 3 can be made uniform with high accuracy. Furthermore, there is no need to lengthen the stator core assembly 1, unlike the conventional case shown in FIG. 2, and there is no need to lengthen the motor.

As described above, according to the present invention, the inner circumferential surface of the stator core assembly and the outer circumferential surface of the stator core assembly, which can be easily machined in the same manner, are aligned with the placket, thereby reducing the number of parts without increasing the length of the motor. , making processing easier,
The effects are outstanding, such as being able to uniformize the voids at low cost and with high precision.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the upper half of a conventional stepping motor in cross section, Fig. 2 is a front view showing the upper half of another conventional stepping motor in the FIG. 2 is a front view showing a cross section of the upper half of a stepping motor according to an embodiment of the invention. 1...Stator core assembly, 2...Rotor, 3...Gap, 7...Bearing, 8...
...Shaft, 12, 12'...Outer peripheral machined surface, 13.13'...Plucket. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
! ! l No. 211! J

Claims (1)

[Claims] The outer peripheral surfaces of both ends of the stator core assembly are machined to be concentric with the inner peripheral surface of the stator core assembly, and a bracket having a bearing for holding the rotor shaft is inserted into the machined surface, and the axial center of the stator core assembly and the A method for assembling a stepping motor characterized by concentrically assembling rotor axes.