JPH08205433A - Stator for electric rotating machine - Google Patents

Abstract

PURPOSE: To prevent the recessed part of a magnet holder from being disengaged from the protruding part of a yoke by setting the engagement margin larger than the gap between the axial ends of a magnet cover and a male spigot part of an end bracket being fitted to the female spigot part of the yoke. CONSTITUTION: The engagement margin A in the axial direction between the protruding part 15 of a yoke 11 and the recessed part 34 of a magnet holder 30 is set larger than the gap B between the forward end face of a position regulating part 57 formed integrally with the male spigot part 56 of an end bracket 50 being fitted to the female spigot part 19 of the yoke 11 and the forward end face of a part 44 to be position regulated formed on a magnet cover 40. Since the engagement of the yoke 11 and the magnet holder 30 is sustained even if the magnet cover 40 is shifted axially due to vibration caused by rotation of a motor 1, a magnet 20 locked to the yoke 11 is prevented from being shifted from the yoke 11 in the circumferential direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator of a rotary electric machine, and more particularly to an improvement of a fixing structure of a magnet (permanent magnet) forming a field pole, for example, fixing a vehicle-mounted motor mounted in an automobile. Regarding what is effective for children.

[0002]

2. Description of the Related Art As a stator of an on-vehicle motor, a cylindrical yoke having one end open and the other end closed, and a plurality of housing compartments are annularly arranged in the circumferential direction with a partition wall interposed therebetween. A magnet holder formed in a cylindrical shape and fitted into the inner circumference of the yoke; and a plurality of magnets housed in respective housing compartments of the magnet holder,
A magnet holder and a McNet cover, which is formed into a cylindrical shape, is fitted inside the magnet holder, and has a flange portion facing the axial end surface of the magnet at the end opposite to the magnet holder. There is something. In this stator, a plurality of recesses are provided at intervals on the outer circumference of the magnet holder, and at the same time,
A plurality of protrusions are provided on the inner circumference of the yoke at intervals, and the recesses and the protrusions are engaged with each other. Further, in some cases, a female seal portion is formed at an opening end of the yoke, and a male seal portion of an end bracket (end plate) that constitutes a motor housing together with the yoke is fitted to the female seal portion.

In this stator, the positioning of the magnet in the circumferential direction is ensured by the engagement between the concave portion of the magnet holder and the convex portion of the yoke. That is, each magnet is positioned in the magnet holder by being housed in each housing compartment of the magnet holder, and this magnet holder is positioned in the yoke by engaging the concave portion with the convex portion.

The axial positioning of the magnet is ensured by the pressure input of the magnet cover.
That is, the magnet group held by the magnet holder is fixed to the yoke by press-fitting the magnet cover on the inner peripheral side thereof.

[0005]

However, in the above-mentioned stator of the on-vehicle motor, when the pressure input of the magnet cover is lowered for some reason, the magnet and the magnet holder move axially due to the vibration of the motor. Therefore, the concave portion of the magnet holder and the convex portion of the yoke are disengaged, and the magnet is moved in the circumferential direction by the reaction force of the armature.

An object of the present invention is to provide a stator of a rotary electric machine capable of preventing the concave portion of the magnet holder and the convex portion of the yoke from being disengaged.

[0007]

A stator of a rotary electric machine according to the present invention comprises a concave portion formed in a magnet holder for holding a magnet in a yoke, and a convex portion protruding from the yoke and engaged with the concave portion. The axial engagement margin with is set to be larger than the gap between the axial end of the male seal portion of the end bracket fitted to the female seal portion of the yoke and the axial end of the magnet cover. And

[0008]

According to the above-mentioned means, even if the pressure input of the magnet cover is lowered for some reason and the magnet and the magnet holder are moved in the axial direction by the vibration of the rotating electric machine, the movement amount of the magnet cover will end. Since the gap between the male cage portion of the bracket and the magnet cover is regulated, the amount of movement of the magnet holder does not reach the degree of releasing the engagement between the concave portion and the convex portion.
In this way, the recesses of the magnet holder and the protrusions of the yoke remain engaged even in the unlikely event that the magnet group held by the magnet holder is reliably prevented from rotating in the circumferential direction. Will be done.

[0009]

1 is a longitudinal sectional view showing a stator of a rotating electric machine according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing the main part thereof.

In the present embodiment, the stator of the rotating electric machine according to the present invention is a vehicle-mounted motor (hereinafter referred to as a motor) 1.
The stator 10 of this motor is used for
1, a plurality of magnets 20, and a magnet holder 3
0, the magnet cover 40, and the end bracket 50
It has and.

The yoke 11 is made of a magnetic material such as iron (Fe), and is integrally formed into a cylindrical shape having one end opened and the other end closed by drawing press working. A bearing accommodating portion 12 accommodating a bearing for supporting the child 2 is integrally formed in a small-diameter short cylindrical shape. A trapezoidal conical tube-shaped connecting portion 13 is integrally formed between the bearing accommodating portion 12 and the large-diameter cylindrical body portion 14 so as to connect them to each other. At the boundary, there are a plurality of protrusions 15 (4 in this embodiment) for ensuring the circumferential positioning of the magnet holder 30.
Individual pieces) are arranged at equal intervals in the axial direction at equal intervals in the circumferential direction, and are integrally projected by radially inwardly embossing.

On the other hand, a flange 16 is integrally projectingly provided at the opening end of the yoke 11 so as to extend radially outward and orthogonally intersect the cylinder center.
A plurality of insertion holes 17 through which bolts 18 for fastening are inserted are opened. Further, on the inner peripheral surface of the opening end portion of the yoke 11, a female seal portion 19 that is coupled to the male seal portion of the end bracket 50 is provided.
It is formed concentrically with the inner diameter of the body portion 14, and the depth of the female stamp portion 19 in the axial direction is constant in the circumferential direction with a dimension that satisfies the following expression (1).

In this embodiment, the magnet 20 is integrally formed by using a neodymium iron boron (Nd-Fe-B) magnet, which is an example of a flight magnet or a rare earth metal-based permanent magnet, and has the same shape. Four items are prepared. Each magnet 20 has a length equal to or less than the length of the body portion 14 of the yoke 11, and is integrally formed into a substantially rectangular parallelepiped having a curved arc shape along the inner circumference of the yoke 11 in the width direction. The width of each magnet 12 in the circumferential direction is set so as to be fitted into a housing compartment of a magnet holder 30 described later in a positioned state.

The magnet holder 30 is made of a non-magnetic material having an appropriate elasticity such as resin and integrally molded by an extrusion molding method or the like, and is formed into a cylindrical shape which is fitted into the yoke 11 as a whole. . On the cylindrical wall of the magnet holder 30, four housing compartments 31 are arranged and arranged in the circumferential direction with the same phase difference. That is, the magnet holder 30 is provided with a ring 32 having a circular ring shape having a substantially square cross section, and one end face of the ring 32 has four prismatic partition walls 33 having a substantially square cross section, and 90 in the circumferential direction.
The partition walls 33, which are arranged at regular intervals and are erected at right angles, are adjacent to each other,
The storage compartments 31 are formed by 33, respectively.
The radial depth of the ring 32 and the radial thickness of the partition wall portion 33 are set to be slightly smaller than the thickness of the magnet 20, and the axial length (height) of the partition wall portion 33 is larger than that of the magnet 20. The distance between the side surfaces of the adjacent partition walls 33, 33 facing each other is set to be equal to the circumferential width of the magnet 20 while being set short. Therefore, the accommodation section 31 is formed in a similar arc-shaped hollow chamber having a height lower than that of the magnet 20 and a width and thickness slightly smaller than the width and thickness of the magnet 20, and one of them is formed. The end surface, the outer peripheral surface, and the inner peripheral surface are open.

On the outer circumference of the ring 32 of the magnet holder 30, there are a plurality of recesses 34 (four in this embodiment) which fit with the projections 15 of the yoke 11, and are arranged at equal intervals in the circumferential direction and are directed radially inward. The concave portion 34 and the convex portion 15 are respectively configured so as to fit into each other. The axial engagement margin A between the concave portion 34 and the convex portion 15 is set so as to satisfy the equation (1) described later.

The magnet cover 40 is integrally formed by deep drawing using an extremely thin plate made of a magnetic material such as iron, and has a main body 41 formed in a cylindrical shape. The main body 41 is formed in a cylindrical shape whose outer diameter is slightly larger than the inner diameter of the cylinder formed by the four magnets 20 as described later. An inward flange 42 having a small width is bent inward in the radial direction at one end of the magnet cover body 41, and a flange 43 is bent at a right angle outward in the radial direction at the other end of the magnet cover body 41. Has been done. Collar part 4
The radial depth of 3 is set to be slightly smaller than the radial depth of the magnet 20. A position regulating portion 44 is continuously provided in a short cylindrical shape around the outer periphery of the collar portion 43, and the axial length (height) of the position regulating portion 44 satisfies the formula (1) described later. Is set. Further, the outer diameter of the position regulated portion 44 is slightly larger than the inner diameter of the yoke 11 and is set to be press-fitted into the yoke.

The end bracket 50 is made of aluminum or resin and is integrally molded by a die casting method or a resin molding method, and is provided with a main body 51 which is formed in a substantially disc shape and covers the end surface of the yoke 11 on the opening side. The brush device accommodating compartment 5 is provided on one end surface of the end bracket body 51.
2 is largely recessed in the shape of a circular hole, and a bearing accommodating portion 53 is coaxially opened at the bottom of the accommodating section 52. Further, a flange 54, which constitutes a flange joint with the flange 16 of the yoke 11, is formed on the outer periphery of the end bracket main body 51 so as to project outward in the radial direction, and a female screw hole 55 is formed in this flange 54. ing.

In the present embodiment, the yoke 1 is attached to the opening edge of the brush device housing section 52 of the end bracket body 51.
A short cylindrical male inrobot portion 56, which is joined to the female inrobot portion 19 of the first item, is projected at a right angle in the axially outward direction. The axial length (height) of the male indigo portion 56 is set to be equal to the axial length (depth) of the female indigo portion 19 and is constant in the circumferential direction. The distal end portion of the male cage portion 56 projects inward in the radial direction from the inner peripheral surface of the yoke 11 and faces the distal end of the position regulated portion 44 of the magnet cover 40 so as to substantially position the position regulated portion 57. It is set to configure. That is, the inner diameter of the cylinder of the male cage 56 is set smaller than the inner diameter of the yoke 11. The gap between the tip of the position regulating portion 57 and the tip of the position regulated portion 44 of the magnet cover 40, which are close to each other and face each other, is B, the convex portion 15 of the yoke 11 and the concave portion 34 of the magnet holder 30.
When the axial engagement allowance with the female seal portion 19 is A, the axial dimensional relationship between the female seal portion 19 and the convex portion 15 of the yoke 11 and the female seal portion 19 are satisfied so as to satisfy the following expression (1). , Oro basket part 56,
The magnet 20, the ring 32 of the magnet holder 30,
The axial dimensional relationship between the convex portion 15 and the concave portion 34 is set. A> B ... (1)

Next, the construction of the motor stator according to the present embodiment and its function and effect will be described by explaining the assembly work of the motor stator by the above-mentioned components.

One magnet 20 is accommodated in each accommodation compartment 31 of the magnet holder 30, and the magnet holder 30 is fitted into the body portion 14 of the yoke 11 through the opening. At this time, the concave portions 34 of the magnet holder 30 are fitted into the convex portions 15 of the yoke 11, respectively. This recess 3
4 and the convex portion 15 are fitted to each other, the magnet holder 30
Is blocked by the body portion 14 of the yoke 11 and is prevented from moving in the direction of the closing wall. In this state, since each magnet 20 is housed in the housing compartment 31 of the magnet holder 30 one by one, it is prevented from rotating by the yoke 11 via the magnet holder 30 and is prevented from moving in the direction of the closing wall. It will be in a state of being.

The assembling order is as follows.
The magnets 20 may be inserted in the order 0.

Next, the magnet cover 40 is press-fitted from the opening of the yoke 11 along the circumferential surface formed by the four magnets 20 and the four partition walls 33 of the magnet holder 30. By press-fitting the magnet cover 40, each magnet 20 is pressed toward the yoke 11 side, and
The opening side shoulder of each magnet 20 is a magnet cover 40.
It is pressed by the collar portion 43 of the. Further, the position-regulated portion 44 of the magnet cover 40 is pressed into the inner circumference of the opening of the yoke 11.

On the other hand, the bearing 7 is accommodated in the bearing accommodating compartment 53 of the end bracket 50, the brush device 8 is accommodated in the brush device accommodating compartment 52, and the rotor 2 of the motor 1 is inserted into the end bracket 50. . here,
The rotor 2 is fixedly equipped with an armature core 4 and a commutator 5 on the outer periphery of the rotor shaft 3, and is inserted into the brush device 8 from the opening of the brush device housing compartment 52 of the end bracket 50 with the commutator 5 side facing forward. Thus, the bearing 7 supports one end of the rotor shaft 3. With one end of the rotor shaft 3 accommodated in the bearing 7, the brush device 8
Each brush 9 is brought into contact with the outer peripheral surface of the commutator 5.

The rotor 2 mounted on the end bracket 50 has the magnet cover 40 in the yoke 11.
Inserted inside. At this time, the rotor 2 is inserted into the magnet cover 40 through the opening of the yoke 11 with the armature core 4 side facing forward, and the rotor 6 is mounted on the bearing 6 previously housed in the closed wall side bearing housing portion 12 of the yoke 11. One end of the shaft 3 is supported. With one end of the rotor shaft 3 supported by the bearing 6, the armature core 4 faces the magnets 20 covered by the magnet cover 40. Subsequently, the bolts 18 are inserted into the respective bolt insertion holes 17 formed in the flange 16 on the yoke 11 side and screwed into the female screw holes 55 of the flange 54 on the end bracket 50 side, so that the yoke 11 and the end bracket 50.
And are concluded.

When the yoke 11 and the end bracket 50 are fastened to each other, the front end surface of the position regulating portion 57 formed integrally with the male cage portion 56 of the end bracket 50 has the yoke 11.
The position regulated portion 44 of the magnet cover 40 press-fitted into the
And a gap B is formed between the convex portion 15 of the yoke 11 and the concave portion 3 of the magnet holder 30.
It is in a state of being smaller than the engagement margin A in the axial direction with respect to 4.

When the motor 1 manufactured as described above is operated by energizing the armature core 4 by the brush device 8, the vibration due to the rotation of the rotor 2 is applied to the yoke 11, the magnet holder 30 and the magnet cover 40. Since it is transmitted, there is a possibility that the fixed state due to the press-fitting of the magnet cover 40 may be loosened. By any chance, magnet cover 40
When the engagement between the convex portion 15 of the yoke 11 and the concave portion 34 of the magnet holder 30 is released by loosening the fixed state of the magnet cover 40 and allowing the magnet cover 40 to move in the axial direction, the convex portion 15 and the concave portion 34 are separated from each other. The engagement causes the magnet holder 30 that is prevented from rotating by the yoke 11 to be allowed to float in the circumferential direction. Therefore, the circumferential position of the magnet 20 group that is held by the magnet holder 30 and is prevented by the yoke 11 from rotating. Is in a state in which it can be displaced with respect to the yoke 11. In this state, if a reaction force due to the rotational force of the armature core 4 is applied to the magnet 20 group, the magnet 20 group may idle.

However, in this embodiment, the tip surface of the position regulating portion 57 formed integrally with the male cage portion 56 of the end bracket 50 and the tip surface of the position regulated portion 44 formed on the magnet cover 40 are used. Is smaller than the axial engagement margin A between the convex portion 15 of the yoke 11 and the concave portion 34 of the magnet holder 30.
The engagement state between the and the concave portion 34 is not released. That is, in the unlikely event that the magnet cover 40 is loosened due to vibration caused by the operation of the motor 1 or the like, the magnet cover 4 is released.
Even if 0 moves in the axial direction, the magnet cover 40
The amount of movement of A is restricted to only the distance of the gap B by the position regulation of the position regulated portion 44 by the tip end surface of the position regulation portion 57 of the end bracket 50, so that the engagement margin A in the axial direction is
Is larger than the gap B, the convex portion 15 and the concave portion 3
The engagement state with 4 is not necessarily released.

Further, preferably, when the gap between the end portion of the magnet 20 and the collar portion 43 is C, the dimensional relationship of each component should be set so as to satisfy the following expression (2). . A> B + C (2) In this case, the pressing force of the magnet cover body 41 on the magnet 20 due to the press-fitting is reduced, and the magnet holder 3
Even if the fixed state between 0 and the magnet cover 40 loosens and moves in the axial direction to change the clearance C, the relative movement amount is the relative position movement portion 44 by the tip end surface of the position regulation portion 57 of the end bracket 50. Since the relationship with the clearance B due to the position regulation is always constant, the relative clearance (B
The engagement state of the engagement margin A between the convex portion 15 and the concave portion 34 having a value larger than + C) is not necessarily released.

Thus, according to this embodiment, by any chance,
Even if the fixed state of the magnet cover 40 is loose, the convex portion 15 of the yoke 11 and the concave portion 34 of the magnet holder 30.
Since the engagement state with the magnet is reliably maintained, it is possible to prevent the magnet 20 group held by the magnet holder 30 and prevented from rotating by the yoke 11 from being displaced in the circumferential direction with respect to the yoke 11. Will be. As a result, it is possible to prevent the situation in which the output of the motor 1 is reduced due to the circumferential displacement of the magnet 20 group.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the scope of the invention.

The position restricting portion 57 for restricting the movement of the magnet cover 40 may be formed by extending the front end portion of the male seal portion 56 in the direction of the magnet cover 40 so as to be close to the end surface of the collar portion 43. In this case, the position regulation unit 57
The position regulated portion 44 of the magnet cover 40 whose position is regulated by is constituted by the end surface of the collar portion 43.

[0032]

As described above, according to the present invention,
Even if the fixed state of the magnet cover is loose,
Since the engagement state between the convex portion of the yoke and the concave portion of the magnet holder is reliably maintained, the magnet group held by the magnet holder and prevented from rotating by the yoke is displaced in the circumferential direction with respect to the yoke. Can be prevented in advance.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a stator of a rotary electric machine that is an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a main part thereof.

[Description of sign]

1 ... In-vehicle motor (rotary electric machine), 2 ... Rotor, 3 ... Rotor shaft, 4 ... Armature core, 5 ... Commutator, 6, 7
... Bearing, 8 ... Brush device, 9 ... Brush, 10 ... Stator,
11 ... Yoke, 12 ... Bearing accommodating part, 13 ... Coupling part, 14
... body part, 15 ... convex part, 16 ... flange, 17 ... bolt insertion hole, 18 ... bolt, 19 ... female cage part, 20 ... magnet, 30 ... magnet holder, 31 ... magnet accommodating compartment, 32 ... ring, 33 ... Partition wall portion, 34 ... Recessed portion, 40 ...
Magnet cover, 41 ... Magnet cover body, 42
... Inward flange part, 43 ... Collar part, 44 ... Position control part, 50
… End bracket, 51… End bracket body, 5
2 ... Brush device accommodating section, 53 ... Bearing accommodating section, 54 ... Flange, 55 ... Female screw hole, 56 ... Male seal section, 57 ... Position regulating section.

Claims (1)

[Claims] 1. A yoke formed in a tubular shape, a magnet holder formed in a tubular shape in which a plurality of housing compartments are annularly arranged with a partition wall in between, and fitted in the inner circumference of the yoke. A plurality of magnets housed in each housing compartment of the magnet holder, and a cylindrical shape that is press-fitted inside the magnet holder and the magnet group. At the end opposite to the magnet holder, the end face in the axial direction of the magnet. And a McNett cover having a flange portion facing each other, and a plurality of recesses which are recessed in the magnet holder at intervals in the circumferential direction and project in the yoke at intervals in the circumferential direction. A rotary electric machine in which a plurality of convex portions provided are engaged with each other, and a male cage portion of an end bracket is fitted to a female cage portion formed at an opening end of the yoke on the collar side. In the stator, the axial engagement margin between the concave portion of the magnet holder and the convex portion of the yoke is larger than the gap between the axial end of the male cage portion of the end bracket and the axial end of the magnet cover. A stator of a rotating electric machine characterized by being set.