JPS62196034A - Stator of motor - Google Patents

Abstract

PURPOSE:To ensure and facilitate the positioning of a pole of pole core with a coupling groove of a yoke core by forming a guide groove in the internal circumferential face of the yoke core and at the same time by forming a barbed portion on the external side face of a flange of a bobbin. CONSTITUTION:A bobbin 15 is integrally formed with a rectangular flange 15b on both sides of a prismatic winding shell 15a, where a coil 16 is wound over. Of the internal circumferential face in the portion facing the flange 15b of the bobbin 15 a guide groove 19 is formed which is oriented to the same direction as in a coupling groove 18. Corresponding to such a guide groove 19 a barbed portion 20 oriented to the laminated direction of the pole core 11 on the external side face of the external flange 15b of the bobbin 15 is formed in two(2) pieces each. These barbed portions 20 are inserted respectively into the guide grooves 19 of the yoke core 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a stator for an electric motor in which a stator core is constructed by connecting a yoke core and a magnetic pole core.

(Conventional technology) A conventional example of this type of stator will be explained with reference to FIG.

A plurality of magnetic pole parts 2 are provided radially protruding from the outer peripheral surface of an annular magnetic pole core 1, and a bobbin 4 around which a coil 3 is wound is fitted onto each magnetic pole part 2.

Then, the engaging portion 5 formed at the tip of each magnetic pole portion 2 is fitted into the connecting groove portion 7 formed on the inner circumferential surface of the rectangular frame-shaped yoke core 6 so as to be oriented in the stacking direction. The core 1 and yoke core 6 are integrated.

(Problems to be Solved by the Invention) When assembling the stator having the above-described configuration, the magnetic poles are If the pole 71 is tilted with respect to the yoke core 6, the frictional resistance between the engaging portion 5 and the connecting groove 7 will increase significantly, and if you try to forcefully push the engaging portion 5 into the connecting groove 7, the magnetic pole core Among these, the thin wall portion 8, which has particularly low mechanical strength, may be deformed, causing the inner diameter portion of the magnetic pole core 1 to become out of roundness. In order to prevent this, it is necessary to align all the engaging parts 5 to the connecting groove 7 at the same time, and then fit all the engaging parts 5 into the connecting groove 7 at the same time and at the same rate from the beginning. However, in reality, it is extremely difficult to perform this kind of work reliably due to the difficulty of positioning, and there are variations in the amount of insertion between the respective engaging parts 5 at the beginning of insertion, and the magnetic pole core 1 may become attached to the yoke core 6. This often occurs in a tilted state, causing deformation of the inner diameter portion of the magnetic pole core 1.

The present invention is intended to solve such problems, and therefore, its purpose is to reliably and easily align each magnetic pole part of a magnetic pole core with each connecting groove part of a yoke core, and to improve the alignment. To provide a stator for an electric motor, which can be inserted straight while guiding the magnetic pole core so that it is not tilted with respect to the yoke core during subsequent insertion, thereby improving assembly workability and preventing deformation of the inner diameter part of the magnetic pole core. It is in.

[Structure of the Invention] (Means for Solving the Problems) The stator of the present invention includes a stator in which a tip end of each magnetic pole portion of a magnetic pole core is fitted into each connecting groove of a yoke core,
A guide groove oriented in the same direction as the connecting groove is formed in a portion of the inner peripheral surface of the yoke core that faces the flange of the bobbin attached to the magnetic pole portion, and a guide groove oriented in the same direction as the connecting groove is formed on the outer surface of the flange of the bobbin. A protruding portion is formed to be fitted into the guide groove portion.

(Function) When assembling, if the protrusion of the bobbin attached to each magnetic pole part is inserted into the guide groove of the yoke core, then when each magnetic pole part is inserted into the coupling groove, the protrusion of the bobbin attached to each magnetic pole part is inserted into the guide groove of the protrusion part. The leading end of each magnetic pole portion is guided straight into each connecting groove while being guided so that the magnetic pole core is not tilted relative to the yoke core due to the guiding action caused by the insertion.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 3. Reference numeral 11 denotes a magnetic pole core having a circular inner diameter portion 11a, and on the outer circumferential surface of this magnetic pole core, for example, four magnetic pole portions 12 are provided radially protruding, and at the tip of each of these magnetic pole portions 12, a protruding engagement portion 13 is provided. , and each engaging portion 13 has a shape that is narrower overall than the magnetic pole portion 12 and wider at the tip end. Further, a thin wall portion 14 is formed in a portion of the magnetic pole core 11 between each magnetic pole portion 12 to increase magnetic resistance. Reference numeral 15 denotes a bobbin made of, for example, insulating resin, which is formed by integrally forming rectangular flanges 15b on both sides of a rectangular cylindrical winding trunk 15a, and a coil 16 is wound around the winding trunk 15a. The bobbin 15 is attached to each magnetic pole portion 12 by, for example, press fitting. On the other hand, reference numeral 17 denotes a rectangular frame-shaped yoke core, and the inner circumferential surface of the yoke core has each of the engaging portions 13.
Four connecting grooves 18 having a shape matching the above are formed oriented in the stacking direction, and the engaging portion 13 of each magnetic pole portion 12 is fitted into each connecting groove 18 . A guide groove 19 oriented in the same direction as the connecting groove 18 is provided in a portion of the inner circumferential surface of the yoke core 17 that faces the flange 15b of the bobbin 15.
is formed.

In this embodiment, the guide groove 19 is connected to each connecting groove 1.
One side edge of the guide groove portion 19 is aligned with the side edge of the magnetic pole portion 12 . Corresponding to the guide groove 19, the outer flange 15 of the bobbin 15
Two protrusions 20 oriented in the stacking direction of the magnetic pole cores 11 are formed on the outer side surface of b, and each of these protrusions 20 is fitted into the guide groove 19 of the yoke core 17.

Next, the operation of the above configuration will be explained. When assembling, first attach the coil 1 to each magnetic pole part 12 of the magnetic pole core 11.
The bobbin 15 wound with 6 is attached by press-fitting. At this time, the flange 15b having the protrusion 20 is positioned on the outside. After installing the bobbin 15, after aligning each protrusion 20 with each guide groove 19 of the yoke core 17,
Each protrusion 20 is fitted into each guide groove 19. At this time, since the protrusion 20 of the bobbin 15 is made of insulating resin,
The insertion resistance to the laminated steel plate forming the guide groove portion 19 is inherently small, and each protrusion 20 is inserted into each guide groove portion 1.
Even if the magnetic pole core 11 is tilted with respect to the yoke core 17 at the initial stage of fitting into the yoke core 17, the tilt of the magnetic pole core 11 can be easily corrected without applying excessive force. The strip portion 20 can be smoothly fitted into each guide groove portion 19. As each protrusion 20 is fitted, the inclination of the magnetic pole core 11 is regulated by the engagement between each protrusion 20 and each guide groove 19, and the magnetic pole core 11 is brought into a state parallel to the yoke core 17. Yoke core 1 while being maintained
7 to approach the end face. As a result of such a guiding action, each engaging portion 13 of the magnetic pole core 11 reaches each guiding groove portion 19 of the yoke core 17 almost simultaneously, and the two are naturally guided into a state in which they are accurately aligned.
This positioning work becomes reliable and easy. After such positioning, when fitting the engaging part 13 into the connecting groove part 18,
Because the magnetic pole core 11 is prevented from being tilted relative to the yoke core 17 due to the guiding action of the projection 20 inserted into the guide groove 19, each engaging portion 13 is inserted into each connecting groove 18. It will be inserted smoothly at the same rate from the beginning. Therefore, it is not necessary to apply excessive force for fitting, and deformation of the inner diameter portion 11a of the magnetic pole core 11 can be prevented, and it can also contribute to improving the ease of assembly.

By the way, both the magnetic pole core 11 and the yoke core 17 are constructed by laminating a large number of punched steel plates, and the punched steel plates are punched out in multiple steps using a raw material of one steel plate by so-called co-cutting. During this punching, after performing so-called trimming punching in which a portion corresponding to the space between the magnetic pole core 11 and the yoke core 17 (the portion indicated by the symbol A in FIG. 3) is punched out, the magnetic pole The engaging portion 13 portion of the portion 12 is punched out along the shear line B.

At this time, in the case of a conventional structure in which a portion corresponding to the guide groove portion 19 is not provided, it is necessary that the corner portion of the trimming punch hole accurately coincide with both ends of the shear line of the engagement portion to be punched out later. However, in reality, the precision of trimming tends to decrease due to wear and misalignment of the punching die, and often the ends of the shear line of the engaging part do not match the corners of the trimming hole, and the shear line A situation arises in which both ends do not protrude into the trimming hole. In such a case, burrs are inevitably formed at both ends of the shear line of the engaging portion, resulting in a problem that an extra step is required to remove the burrs.

In contrast, in this embodiment, one guide groove 19 is formed on both sides of each connecting groove 18, and the guide groove 19 is
Since one side edge of the magnetic pole part 12 is configured to match the side edge of the magnetic pole part 12, by punching out the guide groove part 19 at the same time when trimming, this guide groove part 1 can be removed.
9 can be used as a hole for absorbing trimming errors, and thereby both ends of the shear line B of the engaging part 13 can be reliably protruded into the trimming hole A, and the shear line of the engaging part 13 can be Formation of burrs on both ends of B can be reliably prevented.

In this embodiment, two protrusions and two guide grooves are formed per bobbin, but they may be formed one each or three or more. In addition, the guide groove portion 1
9 may be formed anywhere on the inner circumferential surface of the yoke core 17 as long as it faces the flange 15b of the bobbin 15, and even in this case, the intended purpose of the present invention can be reliably achieved.

[Effects of the Invention] As is clear from the above description, the present invention includes forming a guide groove oriented in the same direction as the connecting groove in a portion of the inner circumferential surface of the yoke core that faces the flange of the bobbin, and Since the structure has a protrusion formed on the outer surface of the flange part to be inserted into the guide groove part, the alignment between each magnetic pole part of the magnetic pole core and each connecting groove part of the yoke core is ensured and easy due to the guiding action during assembly. At the same time, when fitting after alignment, the tip of each magnetic pole part can be guided straight into each connecting groove while guiding the magnetic pole core so that it is not tilted with respect to the yoke core, Therefore, the excellent effects of improving assembly workability and preventing deformation of the inner diameter portion of the magnetic pole core are achieved.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention,
Figure 1 is an overall front view, Figure 2 is a side view showing the state immediately before fitting during assembly, Figure 3 is an enlarged front view of the main parts, and Figure 4 is equivalent to Figure 1 showing the conventional example. It is a diagram. In the drawing, 11 is a magnetic pole core, 12 is a magnetic pole part, 13 is an engaging part, 15 is a bobbin, 15b is a collar part, 16 is a coil, 17 is a yoke core, 18 is a connecting groove part, 19 is a guide groove part, 20
is a protrusion.

Claims (1)

[Claims] 1. A bobbin wound with a coil is attached to each of the magnetic pole parts protruding radially from the outer peripheral surface of the annular magnetic pole core, and the tip of each magnetic pole part is stacked on the inner peripheral surface of the frame-shaped yoke core. The yoke core has a guide groove oriented in the same direction as the connecting groove in a portion of the inner circumferential surface of the yoke core that faces the flange of the bobbin. A stator for an electric motor, characterized in that a protrusion is formed on an outer surface of the flange of the bobbin to be fitted into the guide groove.