JPH09200980A - Stator and manufacturing method thereof - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To suppress generation of eddy current in an outer stator. SOLUTION: An inner stator 10 is formed by laminating electromagnetic steel plates 11.
Is prepared. The coil 18 is wound around the inner stator 10 from the outside. Inner stator 1 around which coil 18 is wound
An outer stator 20 is manufactured by spirally winding a strip-shaped steel plate 21 around the outer periphery of 0 so that the long side is the circumferential direction and the short side is the radial direction and the thickness is the axial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator used in a rotary electric machine such as an electric motor and a method for manufacturing the stator.

[0002]

2. Description of the Related Art Japanese Utility Model Laid-Open No. 57-101551 discloses a rotating electric machine in which a strip-shaped steel plate is wound around the outer circumference of an inner stator around which a coil is wound, with a long side in the circumferential direction and a short side in the axial direction. ing.

[0003]

However, in the above rotary electric machine, since the strip-shaped steel plate is wound so as to be parallel to the current direction of the coil, the eddy current is largely generated in the strip-shaped steel plate, and the performance of the stator is increased. Is reduced.

An object of the present invention is to provide a stator capable of suppressing the generation of eddy currents in the outer stator and a manufacturing method thereof.

[0005]

A stator and a method of manufacturing the same according to the present invention for achieving the above object are as follows. (1) An inner stator made by laminating electromagnetic steel sheets, a coil wound around the inner stator in an axial direction, a long side on the outer periphery of the inner stator, a short side on the outer side and a thickness on the outer side in the radial direction. An outer stator made of a strip-shaped steel sheet spirally wound in a direction. (2) A step of laminating electromagnetic steel plates to form an inner stator, a step of winding a coil around the inner stator in the axial direction, and a long side on the outer circumference of the inner stator on which the coil is wound and a short side in the circumferential direction. And a step of spirally winding a strip-shaped steel sheet so that the thickness is in the axial direction, and manufacturing the outer stator.

In the stator of the above (1), since the strip-shaped steel plate forming the outer stator is wound around the outer circumference of the inner stator so as to be perpendicular to the current direction of the coil, the generation of eddy currents in the outer stator is small and the stator is small. It is possible to prevent the performance degradation of. In the stator manufacturing method of (2) above,
The stator manufactured by the method has the function of the above (1), and since the outer stator is spirally wound around the outer circumference of the inner stator in a plurality of turns, the outer stator is less likely to loosen with respect to the inner stator.

[0007]

1 to 4 show an embodiment of the present invention. FIG. 4 shows the completed stator 1. The stator 1 includes an inner stator 10 and an outer stator 2.
0. The inner stator 10 is composed of a stator plate 11 made of an electromagnetic steel plate. Inner stator 10
Is produced by stacking a large number of stator plates 11 in the axial direction. At the radial center of the inner stator 10,
A hole 12 for inserting a rotor (not shown) is formed. The hole 12 is in the axial direction of the inner stator 10 (center axis X
Direction). A plurality of slots 13 are formed in the outer peripheral portion of the inner stator 10 at predetermined intervals in the circumferential direction. Each slot 13 extends in the axial direction of the inner stator 10. A coil 18 is inserted into each slot 13 so as to extend in the axial direction of the inner stator 10.

The outer stator 2 is attached to the outer periphery of the inner stator 10.
0 is fixed. The outer stator 20 spirally winds a strip-shaped electromagnetic steel sheet 21 as a strip-shaped steel sheet shown in FIG. 2 around the outer circumference of the inner stator 10 so that the long sides are in the circumferential direction and the short sides are in the radial direction and the thickness is in the axial direction. It is produced by
As shown in FIG. 4, the outer stator 20 is fixed to the outer periphery of the inner stator 10 in a state similar to that in which electromagnetic steel sheets are stacked in the axial direction of the inner stator 10. The outer stator 20 is
Similarly to the case where the inner peripheral portion is press-fitted into the outer peripheral portion of the inner stator 10, it is firmly fixed to the inner stator 10 in the axial direction and the circumferential direction.

Next, a method of manufacturing the stator will be described. FIG. 1 shows a manufacturing process of the stator 1. In step A of FIG. 1, a stator plate 11 having a predetermined shape is manufactured by punching an electromagnetic steel plate with a press. In step B of FIG. 1, the inner stator 10 is manufactured by stacking a large number of stator plates 11 in the axial direction. Both sides of each of the laminated stator plates 11 are insulated by coating with varnish or the like. In step C of FIG. 1, the inner stator 1
The coil 18 is wound around 0, and the coil 18 is inserted into each throttle 13. The winding of the coil 18 is performed from the outer peripheral side of the inner stator 10 by a coil winding device (not shown).

In step D of FIG. 1, a strip-shaped magnetic steel plate 21 is spirally wound around the outer circumference of the inner stator 10 around which the coil 18 is wound so that the long side is in the circumferential direction and the short side is in the radial direction and the thickness is in the axial direction. The outer stator 20 is manufactured by winding the outer stator 20 in a spiral shape. In this embodiment, the belt-shaped electromagnetic steel plate 21 is wound by rotating the inner stator 10 around the axis. Rolling rollers 3 are provided on both sides of the strip-shaped electromagnetic steel plate 21.
0 is provided, and the strip-shaped electromagnetic steel plate 21 is attached to the inner stator 1
When wound around 0, the strip-shaped magnetic steel sheet 21 is rolled by the rolling roller 30. The axis of the rolling roller 30 is directed to the rotation center X of the inner stator 10. The thickness of the strip-shaped electromagnetic steel sheet 21 that passes through the rolling roller 30 and is wound around the inner stator 10 is uniform on the inner peripheral side and the outer peripheral side.

At the time when the winding of the strip-shaped electromagnetic steel plate 21 is completed, the outer stator 20 replaces the electromagnetic steel plate with the inner stator 10.
The inner stator 10 is in the same state as when it is laminated in the axial direction of
It is fixed to the outer circumference of. On both surfaces of the strip-shaped electromagnetic steel sheet 21 wound around the inner stator 10, for example, rolling rollers 30 are provided.
Immediately after the rolling by the. Strip electromagnetic steel sheet 2
When it is desired to further improve the dimensional accuracy of the stator 1 after the winding of 1, the inner diameter of the inner stator 10 or the outer diameter of the outer stator 20 may be cut by machining.

Next, the manufacturing method of the stator and the operation of the stator will be described. Since the slot 13 of the inner stator 10 around which the coil 18 is wound is formed outside, the coil 18 can be wound from the outside of the inner stator 10 in step C. Slot 1
When 3 is provided on the outer side of the inner stator 10, the opening portion of the slot 13 can be made larger than when it is provided on the inner side, so that the coil winding device can easily enter and the coil winding can be performed easily. . Further, since the coil 18 can be inserted into the slot 13 while pressing the coil 18 in the slot 13 from the outer peripheral side of the inner stator 10, the coil 18 can be inserted into the slot 13 with almost no gap. Therefore, the coil 18 for the slot 13
The space factor is increased, and a lightweight and high-power stator 1 can be obtained.

When a current is passed through the coil 18 in the slot 13, a magnetic flux is generated around the coil 18 by this current, and an eddy current is generated in the outer stator 20 due to the intersection with the magnetic flux. Here, the outer stator 20 is a strip-shaped electromagnetic steel plate 21.
Are stacked in the axial direction of the inner stator 10, and both surfaces of the strip-shaped electromagnetic steel plate 21 are insulated, so that almost no eddy current can flow in the axial direction of the outer stator 20. Therefore, it is possible to reduce the generation of the eddy current in the outer stator 20, and the energy loss due to the eddy current is reduced.

Since the outer stator 20 is formed by winding a number of strip-shaped electromagnetic steel plates 21 around the inner stator 10, the outer stator 20 is unlikely to come loose with respect to the inner stator 10, and the outer stator 20 is attached to the inner stator 10. It is firmly fixed. Therefore, it is not necessary to press fit the outer stator 20 into the inner stator 10 by shrink fitting, etc., and the productivity of the stator 1 can be improved.

[0015]

(1) According to the stator of claim 1, since the strip-shaped steel plates forming the outer stator are stacked in the axial direction of the inner stator, the eddy currents in the outer stator due to the current flowing through the coil. Is lessened and the performance of the stator can be improved. (2) According to the stator manufacturing method of claim 2, a strip-shaped steel plate is provided on the outer periphery of the inner stator around which the coil is wound so that the long side is the circumferential direction and the short side is the radial direction and the thickness is the axial direction. Since the outer stator is manufactured by spirally winding, the outer stator is unlikely to be loosened with respect to the inner stator, and the outer stator can be firmly fixed to the inner stator. Therefore, press-fitting such as shrink fitting is not necessary for fixing the outer stator, and the productivity of the stator can be improved. Further, since the outer stator is made of a strip steel plate, it is possible to efficiently take the material and prevent the material from being wasted.

[Brief description of drawings]

FIG. 1 is a process drawing showing a manufacturing process of a stator according to the present invention.

FIG. 2 is a front view of the strip steel plate of FIG.

FIG. 3 is a front view showing a rolled state of the strip-shaped steel sheet when the strip-shaped steel sheet of FIG. 1 is wound around an inner stator.

FIG. 4 is a front view of a stator completed through the steps of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 stator 10 inner stator 11 electromagnetic steel plate (stator plate) 13 slot 18 coil 20 outer stator 21 strip steel plate (stripe electromagnetic steel plate)

Claims (2)

[Claims] 1. An inner stator made by laminating electromagnetic steel sheets, a coil wound around the inner stator in an axial direction, a long side of the outer periphery of the inner stator and a short side of the inner stator in a radial direction. And an outer stator made of a strip-shaped steel sheet spirally wound so that is in the axial direction. 2. A step of laminating electromagnetic steel sheets to form an inner stator, a step of winding a coil around the inner stator in the axial direction, and a long side on the outer circumference of the inner stator on which the coil is wound and a short side in the circumferential direction. And a step of spirally winding a strip-shaped steel sheet so that the thickness is in the radial direction in the radial direction to produce an outer stator.