JPH04236149A - Stator structure for motor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator structure for an electric motor in which the stator is wound.

0002

2. Description of the Related Art When completing stator winding by inserting windings into the stator slots of an electric motor, each slot opens on the inner surface of the stator core, so the windings are inserted through the openings.

However, the above-mentioned method cannot generally be said to have high working efficiency, and in order to perform the work efficiently, it is necessary to increase the cross-sectional area of each slot.

0004

[Problems to be Solved by the Invention] However, as the cross-sectional area of the slot increases, the tooth width and back portion of the stator core inevitably become narrower, resulting in an increase in magnetic resistance.
This causes magnetic saturation, and a situation may arise in which a predetermined torque is not output. Furthermore, when the motor rotates at high speed, so-called iron losses such as eddy current loss and hysteresis loss occur, which also impairs output efficiency.

Accordingly, an object of the present invention is to improve the workability of the winding process, increase the winding space factor, and increase the output efficiency.

[0006]

[Means for Solving the Problems] In view of the above object, the present invention provides a stator core in which a slot is formed that does not open on the inner surface of a cylindrical member made of a magnetic material but opens on the outer surface. A stator structure for an electric motor is provided, wherein a winding is inserted, an opening on the outer surface is sealed with a magnetic member, and a slot opening is formed on the inner surface.

[0007]

[Operation] Since the shape of the slot can be formed so that it has a larger width closer to the outer periphery of the stator core, it is easier to insert the winding wire from the outer periphery of the slot opened on the outer periphery of the cylindrical member that can become the stator core. After the winding is inserted, a magnetic member is inserted through the outer peripheral opening of the slot to seal the slot, so that the space factor of the winding within the slot can be significantly improved. As a result, magnetic resistance is reduced, magnetic flux leakage and iron loss are reduced. Slot openings on the inner periphery of the stator core are formed by post-processing.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in more detail below based on embodiments shown in the accompanying drawings. Figure 1 shows the radial slot 1
This figure shows one-fourth of the thick-walled cylindrical member that formed the stator core 2, and is the member that will eventually become the stator core, and will be referred to as the stator core 10 hereinafter.

A set of windings 14 covered with an insulating tape 16 is inserted through an outer circumferential opening 12a of a slot 12 opened at an outer circumference 10a of the stator core 10. At this point, the slots 12 are not opened in the inner circumference 10b of the stator core 10, and therefore the stator core 10 is integrated. On the other hand, the opening 12a on the outer periphery can be set larger than the opening 12a formed on the inner periphery 10b, so that the winding assembly can be easily inserted.

The outer peripheral opening 12a is sealed by a columnar member 18 made of a magnetic material so that the inserted winding assembly occupies a large proportion of the slot 12. In order to completely fix these columnar members 18 in each slot 12, after insertion, a linear welding line 20 may be applied in the circumferential direction as shown in FIG.

After the above-mentioned assembly work is completed, inner peripheral openings 12b shown in FIG. 3 are formed corresponding to each slot 12. This completes the stator. In order to reduce eddy current loss, the columnar member 18 is made of a thin plate 18 as shown in FIG.
It is desirable that the above-mentioned thick-walled cylindrical body formed as a laminate of a and forming the stator core be similarly a laminate of thin plates.

Furthermore, in order to efficiently seal each slot 12 with the columnar members 18h, as shown in FIG. It is to keep it. Although FIG. 5 shows a member having a laminated structure to reduce eddy current loss as shown in FIG. 4, it may be an integral member formed by processing one cylindrical member.

[0013]

[Effects of the Invention] As is clear from the above description, according to the present invention, the workability of the winding process is improved and the winding space factor can be dramatically increased, resulting in high output efficiency. It becomes possible to realize an electric motor.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a quarter stator part showing a state in the middle of assembly of a stator according to the present invention.

FIG. 2 is an enlarged view of a slot at an intermediate stage of forming a stator according to the present invention.

FIG. 3 is an enlarged partial view of a completed stator according to the present invention.

FIG. 4 is a perspective view showing a second embodiment of a magnetic member used for assembling the stator shown in FIG. 1;

FIG. 5 is a perspective view showing a third embodiment of a magnetic member used for assembling the stator shown in FIG. 1;

[Explanation of symbols]

10...Stator core 12...Slot 14...Winding wire 16...Insulating tape 12a...Outer opening 12b...Inner circumference opening

Claims (3)

[Claims] Claim 1: In a stator core, a cylindrical member made of a magnetic material has a slot that does not open on the inner surface but opens on the outer surface, and a winding wire is inserted into the slot from the opening on the outer surface, and the opening on the outer surface is connected to the magnetic member. 1. A stator structure for an electric motor, characterized in that the stator structure is sealed by a stator, and a slot opening is formed in the inner surface. 2. A stator structure for an electric motor according to claim 1, wherein the cylindrical member and the magnetic member have a laminated structure of thin plates. 3. The stator structure for an electric motor according to claim 1, wherein the magnetic members sealing the opening on the outer surface are connected to each other and formed in the shape of an internal gear member.