JP2838247B2 - Manufacturing method of stepping motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a stepping motor.
The present invention relates to a manufacturing method, and more particularly, to a method of combining a stator and a rotor support portion.

[0002]

2. Description of the Related Art FIG. 1 shows a configuration of a conventional stepping motor 1. The stepping motor 1 is assembled by a stator 2 and a permanent magnet type rotor 3, and the stator 2 has an annular pair of stator cores 4, 5.
Are fixed in two layers, and coils 6 and 7 are incorporated inside the pair of stator cores 4 and 5.

The center shaft 8 of the rotor 3 is rotatably supported by bearings 9 and 10 at both ends thereof.
It is fixed to the outer surface of the stator 2 via 1 and 12. The bearings 9 and 10 are fixed to fit inside bearing support holes 13 and 14 formed in the center portions of the side plates 11 and 12, respectively.

In the conventional assembly, a side plate 11 integral with the bearing 9 is fixed outside the stator core 4 in a centered state, and then the rotor 3 is inserted into the stator core 4, and then the stator core 5 is attached to the stator core 4. After the positioning, it is fixed by, for example, plasma welding, and then, while forming an appropriate air gap between the inner periphery of the stator 2 and the outer periphery of the rotor 3, the side plate 12 integral with the bearing 10 is fixed to the stator core 5. , And the center shaft 8 of the rotor 3 is rotatably incorporated in the stator 2 by the bearings 9 and 10 at both ends.

Here, the outer diameter of the bearings 9 and 10 of the rotor 3 is smaller than the outer diameter of the rotor 3. Therefore, the centering of one bearing 9 and the rotor 3 is performed by the rotor 3
Can be made with high accuracy while checking the air gap before inserting it into the stator 2. However, after inserting the rotor 3 into the stator cores 4 and 5 , the other side plate 12 is
When the side plate 12 is fixed, the air gap is formed due to the presence of the side plate
Cannot be confirmed from outside.

For this reason, the centering of the other side plate 12 with respect to the inner peripheral surface of the stator 2 cannot be sufficiently performed, which causes a defective assembly. In particular, the rotor 3 cannot be inserted while checking the air gap between the inner peripheral surfaces of the stator cores 4 and 5 and the outer peripheral surface of the rotor 3, and there is concern about quality assurance. The air gap is ensured depending on the accuracy of the parts, and there is a problem in the process capability. In addition, a replacement test of the rotor 3 at the time of characteristic check cannot be performed.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to confirm an air gap between rotors at the stage of installing the rotor inside the stator, and to center the rotors with high precision. .

[0008]

According to the above object, the present invention provides an
The stator core is fixed concentrically to form the stator.
After that, fit a concentric gauge on the inner peripheral surface of this stator core.
With one bearing on one side of this concentric gauge
Mounting plate on one side plate supporting the stator and the stator core
To the stator core in a contact state where
Centering one of the side plates and aligning it with the stator core after centering.
And the other of the concentric gauges
Other side plate and stator core supporting the other bearing on the side
In the abutment where it can move in the radial direction
Center the other side plate with respect to the
The data core and the other side plate are fixed and provided on the side plate.
Bearing support hole equal to the inner diameter of the stator core or
Bearing support larger than the inner diameter and provided on the side plate
The concentric gauge is pulled out of the hole.

According to the assembly of the centering between the side plates and the stator prior to insertion of the rotor it is possible, also side plates Ru can be fixed after the centering respect <br/> stator. As a result, due to the high processing and part assembly accuracy of individual components, accuracy when assembled as a finished product of the stepping motor becomes charge-<br/> min.

[0010]

FIG. 2 shows the structure of a stepping motor 1 to be assembled according to the present invention. The stepping motor 1 is assembled by an annular stator 2 and a cylindrical permanent magnet rotor 3. The stator 2 has an annular pair of stator cores 4 and 5 stacked and fixed in two layers, and coils 6 and 7 are provided inside the pair of stator cores 4 and 5.
Has been incorporated.

The center shaft 8 of the rotor 3 is rotatably supported by bearings 9 and 10 at both ends thereof.
It is fixed to the outer surface of the stator 2 via 1 and 12. The bearings 9 and 10 are fixed to fit inside bearing support holes 13 and 14 formed in the center portions of the side plates 11 and 12, respectively. Needless to say, the center holes of the bearings 9 and 10 are formed so as to be accurately centered with respect to the outer shapes of the bearings 9 and 10.

Here, the bearing support hole 14 of the side plate 12 for supporting one of the bearings 10 is formed to be substantially equal to or larger than the inner diameter of the stator cores 4, 5. The side plate 12 can be moved in the radial direction with respect to the mounting portion on the side of the stator core 5, and can be fixed after alignment.

In the step of assembling the stepping motor 1, as shown in FIG. 3, the annular stator cores 4 and 5 are combined in a concentric state by welding or the like, and then the concentric gauges 15 are attached to the inner peripheral surfaces of the stator cores 4 and 5. Are inserted in a fitted state, and the side plate 11 is attached to the shaft portion at one end of the concentric gauge 15.
By inserting the bearing 9 integrated with the
Bearings 9 with reference to the inner peripheral surfaces of stator cores 4 and 5 of FIG.
In a centered state. In this state, the side plate 11 is fixed to the side surface of the stator core 4.

Next, it is assumed that the side plate 12 can be radially moved to a mounting portion outside the stator core 5 without the bearing 10. At this time, the bearing support hole 14 is fitted in the concentric gauge 15 so as to be positioned concentrically with respect to the inner peripheral surfaces of the stator cores 4 and 5 and with the center of the fixed bearing 9 as a reference line. . In this state, the side plate 12 is centered on the inner peripheral surfaces of the stator cores 4 and 5 as a reference surface, and is fixed to the mounting portion of the stator core 5 by appropriate fixing means, for example, welding. In addition,
When the bearing support hole 14 is larger than the inner diameter of the stator cores 4, 5, the concentric gauge 15 has a large diameter at a portion that fits into the bearing support hole 14.

Thereafter, the concentric gauge 15 is removed from the inside of the bearing support hole 14, and the rotor 3 is inserted from the bearing support hole 14 into the stator cores 4 and 5 instead of the concentric gauge 15. insert. At this time, the air gap can be confirmed from the bearing support hole 14. Next, the bearing 10 is passed through the other central shaft 8, the bearing 10 is fitted into the bearing support hole 14 of the side plate 12, and fixed by a suitable fixing means such as caulking.

According to such an assembling process, the bearing 9 is centered by the concentric gauge 15, and the side plate 12 for fixing the bearing 10 is fixed to the stator 2 by the concentric gauge 15. it can. When the bearing 10 is fixed to the side plate 12, the bearing support hole 14 is centered with high precision with respect to the stator cores 4 and 5, so that the bearing 10 fixed to this portion is also fixed to the bearing. 10 at the stage of fabrication
It can be positioned on the basis of high accuracy, so that can be fixed on the basis of the centering state with high accuracy.

[0017]

According to the present invention, the core is fixed in a concentric state.
You. The centering of the inner peripheral surface of the stator core at two locations, that is, the two side plates, is performed using one centering gauge.
Before incorporating the rotor in the core, because that allows direct, its core and out Shiga can be performed reliably and efficiently, for attaching the side plates Sutetakoshi, because that allows the centering of the stator core and the side plate, the stator inner circumference easily ensured air gap between the surface and the rotor outer circumference and Do Ri, air gap
Easy to such Rukoto adjustment, even after the assembly, using a large bearing support hole than the rotor, replacement of a rotor is facilitated, and the measurement and the rotational property, does not degrade the whole and analyzing problems It is possible to obtain effects such as easy operation as it is.

[Brief description of the drawings]

FIG. 1 is a sectional view of a conventional stepping motor.

FIG. 2 is a sectional view of a stepping motor according to the present invention.

FIG. 3 is a sectional view of the stepping motor according to the present invention in a state in which the stepping motor is being assembled.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stepping motor 2 Stator 3 Rotor 4 Stator core 5 Stator core 6 Coil 7 Coil 8 Center shaft 9 Bearing 10 Bearing 11 Side plate 12 Side plate 13 Bearing support hole 14 Bearing support hole 15 Concentric gauge

Claims (1)

(57) [Claims] An annular stator core is fixed in a concentric state.
After that, fit a concentric gauge on the inner peripheral surface of this stator core.
While inserted in the stomach condition, it supports one of the bearing on one side of the concentric gauge
Side plate and stator core side mounting part move in radial direction
One side plate is aligned with the stator core
And fix the stator core and one side plate after centering
And the other side of the concentric gauge supports the other bearing
Side plate and stator core side mounting part move in radial direction
The other side plate to the stator core
And fix the stator core and the other side plate after centering
The bearing support hole provided in the side plate is inserted into the stator core.
Equal to or larger than the inner diameter and provided on the side plate
Removing the concentric gauge from the provided bearing support hole .