JPH0429548A - Stator for motor and assembling method thereof - Google Patents

Abstract

PURPOSE:To prevent increase of axial dimension of a motor due to addition of a cover including an outer flange in the stator of the motor by an arrangement wherein the inner circumferential face of a yoke compresses the outer circumferential edge of the outer flange of the cover in the radial direction. CONSTITUTION:A yoke 1, a permanent magnet 2 and a cover 3 constitutes a stator. Flanges 11 are projected radially, with an interval of 90 deg., in the vicinity of the bottom from the circumferential wall section of the yoke 1 and grooves 21 to be engaged with the flanges 11 are made in the outer face of a permanent magnet 2. When they are engaged, displacement of the permanent magnet 2 to the right on the drawing is limited. At first, the flange 11 of the yoke is engaged with the groove 21 in the permanent magnet 2 in order to position the permanent magnet 2 which is then temporarily magnetized. The cover 3 is then inserted into the permanent magnet 2 until the outer flange 33 is brought into contact with the side end face of the permanent magnet 2. Bulging is then carried out in the direction for enlarging the diameter of the cover 3 thus providing bulges 3a, 3b and completing mutual fixing of magnets.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stator for a rotating machine having a permanent magnet type stator, such as a magnet type rotating machine, and a method for assembling the same.

[Prior Art] JP-A-55-153258 discloses a method of fixing a permanent magnet EJ type to a stator of a rotating machine.

That is, in this prior art, an appropriate number of permanent magnets 2a are arranged between a solidified yoke 1h that is open at one end and a cover 3a that is open at both ends and has a cup-shaped flange portion 31a and is inserted into the yoke 1a. Furthermore, the inner surface of the permanent magnet 2a is bonded to the outer circumferential surface of the cover 38, and the inner circumferential surface of the yoke 1a is bonded to the outer circumferential surface of the flange portion 31a, thereby joining these two magnets (see FIG. 10). .

[Problem to be Solved by the Invention 1] However, in the conventional stator described above, the cup-shaped flange portion (i.e., the cylindrical portion having a larger diameter than the main portion 32a of the cover 3a) 31a is inserted in the axial direction from one end of the cover 3a. Therefore, the axial dimension of the rotating machine increases by the axial dimension L1 of the flange portion 31a, which has the disadvantage of causing an increase in the size of the rotating machine.

More precisely, since the coil of the armature overhangs on both sides in the axial direction by a predetermined coil overhang dimension C, the dimension (L-C)
However, the axial direction of the rotary machine will increase.

The present invention has been made in view of the problem, and an object of the present invention is to provide a motor stator and an assembly method thereof that can properly fix a cover and a permanent magnet without increasing the size of the rotating machine. It is said that

[Means for Solving the Problems] A stator of a motor according to the present invention includes a substantially cylindrical yoke having at least one open end, an outer flange at one end that is in contact with an inner circumferential surface of the yoke, and a stator that is concentric within the yoke. In a stator of a motor, the stator includes a substantially cylindrical cover arranged and a substantially arc-shaped permanent magnet sandwiched between an inner circumferential surface of the yoke and an outer circumferential surface of the cover. It is characterized in that the outer peripheral edge of the outer flange is compressed in a diametrical direction.

In a preferred assembly method, the outer flange, which is previously formed to have a larger diameter than the inner diameter of the yoke, is press-fitted into the yoke and fixed.

[Operations and Effects of the Invention] In the motor stator of the present invention, the inner circumferential surface of the yoke compresses the outer circumferential edge of the outer flange of the cover in the diametrical direction to fix the cover. It is possible to prevent an increase in the axial dimension of the motor due to the attachment of the motor.

Further, since the cover of the present invention does not have a two-stage cylindrical shape, two-stage drawing is not required, and the molding process of the cover is extremely simple.

[Example] A first cross-sectional side view of a magnet motor as an example of the present invention is shown below.
The front view and cross-sectional side view of the stator 1 are shown in FIG.
As shown in FIG.

(Overall Configuration) This magnet electric motor has a housing 8 in which a recess 80 is formed, and a shaft 5 is rotatably supported deep inside the recess 80 via ball bearings 61 and 63. In addition, the recess 80
A disk-shaped brush holder 7 in which a plurality of pairs of brushes 71 are arranged rotationally symmetrically is disposed in the immersion chamber, and a through hole through which the shaft 5 is inserted is provided in the center of the brush holder 7. ing. The inner end of each brush 71 is pressed against a commutator 9 fixed to the shaft 5, and the armature 4 is fitted and fixed to the right end of the shaft 5.

Further, an annular groove is formed in the inner peripheral surface of the housing 8 that supports the ball bearing 62, and an annular groove is formed in the outer ring 62a of the ball bearing 62 so as to be integrated with this annular groove. . The armature 4 is fixed in the axial direction by injection molding resin 64 into both grooves through injection holes (not shown). Note that the ball bearing 6 is press-fitted and supported by the eccentric portion 51 of the shaft 5.
3 drives a pump (not shown).

Furthermore, the flange portion 11 of the yoke 1 is fastened to the right end surface of the housing 8 extending radially outward from the periphery of the recess 80 .

The yoke 1 has a solidified shape with one end open, and the recess of the yoke 1 and the recess 80 of the housing 8 constitute a sealed space. Four permanent magnets 2 having a substantially circular arc shape are arranged rotationally symmetrically on the inner peripheral surface of the yoke 1, and further,
A cylindrical cover 3 is inserted into each permanent magnet 2 with openings at both ends.

These yoke 1, permanent magnet 2, and cover 3 constitute a stator. The peripheral wall of the yoke 1 has a diameter of 90 mm near the bottom.
A protrusion 11 is recessed in the radial direction at each angle, and
The outer surface of the permanent magnet 52 is provided with a groove 21 that engages with the embossed part 11.
is recessed. Due to this engagement, the permanent magnet 2
The displacement in the direction of the stone in Figure 1 is regulated.

(Details of 4M construction of cover 3) As shown in FIGS. 4 and 5, the cover 3 has a diameter-reducing tapered portion 32 at one end and an outer flange 33 extending radially outward at the narrow end. are doing. This diameter-reduced tapered portion 32 is for guiding when inserting into the inner surface of the magnet.

Notches 34 are formed in the outer flange 33 at predetermined intervals, and a large number of tongue pieces 39 are formed between the two notches 34. These tongue pieces 39 are bent obliquely outward in the axial direction before assembly.

The important point here is that the outer diameter d1 of the tongue piece 39 in the folded state is less than or equal to the inner diameter of the yoke 1, and that the outer diameter d3 of the tongue piece 39 in the extended state is a predetermined distance from the inner diameter of the yoke 1. That's the only big thing.

The formation of this cover 3 will be explained.

First, prepare a thin aluminum plate and draw it into a cylindrical shape with a flange. Next, from this flange, an outer flange 33 having a notch 34 and a tongue piece 39 is formed. The cover 3 is formed by bending the tongue piece 39 obliquely outward in the axial direction.

The actual assembly of the present invention will be explained.

First, the yoke embossing 11 and the notch groove 21 of the permanent magnet 2 are engaged to position the permanent magnet 2. At this time, if the permanent magnet '52 is temporarily magnetized, the workability of the subsequent process will be improved. The cover 3 is inserted into the positioned permanent magnet 2 until the outer flange 33 comes into contact with the side end surface of the permanent magnet 'f52. At this time, the diameter-reducing taper portion 32 serves as a guide for insertion. Tongue piece 39
The outer flange 33 including the yoke 1 has an outer diameter smaller than the inner diameter of the yoke 1, and the cover 3 can be easily inserted into the yoke 1. After insertion, the cover 3 is bulged in the diametrically expanding direction, the overhangs 3a and 3b are manufactured, and the mutual fixation of the magnets is completed. Next, when the tongue piece 39 is held up to the side end face of the permanent magnet 2 and raised, d3>D, so the tip of the tongue piece 39 is pressed against the inner circumferential surface of the yoke 1 and the cover 3 is pressed against the inner peripheral surface of the yoke 1. 1 in the axial direction.

(transformation) Of course, the yoke 1 may have an open shape at both ends.

Moreover, the above-described punching of the yoke 1 is unnecessary when the yoke 1 is positioned in the axial and radial directions using a jig.

The tongue piece 39 of the outer flange 33 of the cover 3 can also be omitted,
In addition, as shown in FIG.
9 is provided, and this bent part 39 is struck and stretched to form the outer tsuba 3.
It is also possible to increase the diameter of 3.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional side view of a magnet motor using the present invention;
The figure is a front view of the stator 1, Figure 3 is a cross-sectional side view of the stator 1, Figure 4 is a side view of the cover 3, Figure 5 is a front view of the cover 3, and Figures 6 and 7 are external views. An enlarged side view of the flange 33 before and after bending, FIGS. 8(a) and 8(b) are a partial front view and a sectional view showing the engagement between the yoke 1 and the permanent magnet 2, and FIG. 9 is an enlarged side view of the outer flange. 3
FIG. 10 is a partially enlarged cross-sectional side view showing a modification of No. 3, and FIG. 10 is a cross-sectional view showing a conventional stator structure. 1...Yoke 2...Permanent magnet 3...Cover 33...Outer flange

Claims (2)

[Claims] (1) a substantially cylindrical yoke with at least one end open; a substantially cylindrical cover having one end having an outer flange in contact with the inner peripheral surface of the yoke; and a substantially cylindrical cover disposed concentrically within the yoke; and an inner periphery of the yoke. In the motor stator, the yoke inner circumferential surface compresses the outer circumferential edge of the outer flange of the cover in a diametrical direction. A motor stator characterized by: (2) The method for assembling a stator of a motor according to claim 1, wherein the outer flange, which is previously formed to have a larger diameter than the inner diameter of the yoke, is press-fitted into the yoke.