JP2001286085A - Core insulator for rotor of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a core insulator for a rotor of a motor which can reduce the cost of a motor. SOLUTION: This core insulator 14 has an insulating unit comprising a cylinder part 14a, core end surface insulating parts 14b, and slot insulating parts 14c which covers predetermined parts with which windings 16 applied to a core 12 of a rotor 10 can be brought into contact; and an axle part 14a of a commutator 17 which is formed integrally with the insulating unit. With this constitution, a working process for fixing the commutator 17 (the axle part 14e) can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core insulator for a motor rotor.

[0002]

2. Description of the Related Art Conventionally, for example, in a DC motor, as a method of insulating between a core and a winding constituting the rotor, a resin molded product (insulator) made of an insulating material is provided between the core and the winding. Various intervening methods have been proposed, an example of which is disclosed in JP-A-8-84458.

In this publication, an insulator includes a winding insulating portion that insulates a winding portion of a core, a shaft insulating portion formed integrally with the winding insulating portion and externally fitted to an armature shaft, and a shaft insulating portion. And a connecting portion provided at the tip of the. Then, the shaft portion of the commutator (commutator) is integrally connected to and fixed to the connecting portion to improve the fixing force of the commutator.

[0004]

However, in the above-mentioned publication, there is a problem that a step of assembling the commutator integrally with the insulator increases the number of assembling steps and increases the cost of the motor.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a core insulator for a rotor of a motor which can reduce the cost of the motor.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an invention according to claim 1 is a motor rotor core insulator mounted on a motor rotor having a commutator. An insulating portion for covering and insulating a predetermined portion with which a winding wound on the core can come into contact, and a shaft core portion of the commutator integrally formed with the insulating portion are provided.

According to a second aspect of the present invention, in the motor core insulator according to the first aspect, a gap is provided between the shaft core and the rotating shaft of the rotor. According to a third aspect of the present invention, in the motor rotor core insulator according to the first or second aspect, the core is:
It is provided with a plurality of teeth around which the winding is wound, the insulating portion is provided continuously with the shaft core portion, and a tubular portion covering the rotating shaft of the rotor, and provided continuously with the tubular portion. A core end surface insulating portion that covers one end surface of the core, and a slot insulating portion that is connected to the core end surface insulating portion and is inserted into a slot between the teeth to cover an inner peripheral surface of the slot. Equipped.

According to a fourth aspect of the present invention, in the core insulator for a rotor of a motor according to any one of the first to third aspects, the insulating portion is provided on the core before the winding of the winding. It has fixing means for fixing.

According to a fifth aspect of the present invention, in the motor core insulator according to any one of the first to fourth aspects, the commutator includes a plurality of commutator pieces each having an embedded piece. Wherein the shaft core portion comprises:
The embedded piece of each commutator piece is inserted and each commutator piece is fixed.

Therefore, according to the first aspect of the present invention,
The core insulator includes an insulating portion that covers and insulates a predetermined portion with which a winding wound around a core of the rotor can come into contact, and a shaft core portion of a commutator integrally formed with the insulating portion. Therefore, an operation process for fixing the commutator (shaft core) can be omitted, and the cost of the motor can be reduced.

According to the second aspect of the present invention, since a gap is provided between the shaft core of the commutator and the rotating shaft of the rotor, no stress acts on the shaft core when the core insulator is fixed. . Therefore, the roundness of the outer peripheral surface of the shaft core portion, that is, the surface of the commutator piece provided on the outer peripheral surface in sliding contact with the brush can be accurately maintained. Further, it is not necessary to set the dimensions of the shaft core in consideration of cracks caused by the stress of the shaft core, and it is not necessary to form the shaft core with high accuracy. And the formation of the shaft core (core insulator) becomes easy. Further, since the shaft core is easily bent to the outer diameter side, even if stress such as vibration or centrifugal force is applied to the winding, the shaft core absorbs the stress and the stress applied to the winding is reduced.

According to the third aspect of the present invention, the insulating portion of the core insulator includes a cylindrical portion provided continuously with the shaft core portion and covering the rotating shaft of the rotor, and an end surface of one side of the core provided continuously with the cylindrical portion. And a slot insulating portion connected to the core end surface insulating portion and inserted into a slot between the teeth to cover the inner peripheral surface of the slot. Therefore, 1
One molded product can cover the rotating shaft between the commutator and the core, one end surface of the core, and the inner peripheral surface of the slot of the core.

According to the fourth aspect of the present invention, the insulating portion has a fixing means for fixing to the core before the winding of the winding. Therefore, by this fixing means,
Since the core insulator is fixed to the core before the winding of the winding, the winding operation of the winding is facilitated.

According to the fifth aspect of the present invention, the embedded piece of each commutator piece is inserted into the shaft core and each commutator piece is fixed. Therefore, since it is not necessary to assemble each commutator piece to the shaft core, the commutator can be easily assembled.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross section of a DC motor 1 of the present embodiment. A motor housing 2 of the DC motor 1 includes a bottomed cylindrical yoke 3 and an end frame 4. The yoke 3 is provided with a bearing recess 5 at the bottom thereof, and a bearing 6 is fixed to the bearing recess 5. On the inner surface of the yoke 3, a magnet 7 having a plurality of poles is fixed. On the other hand, the end frame 4 is fixed to the opening of the yoke 3. A bearing recess 8 is formed at the center of the inner surface of the end frame 4, and the bearing recess 8 has a through hole 8 a.
Are formed. A bearing 9 is fixed to the bearing recess 8. A rotor 10 is accommodated in a space formed by the end frame 4 and the yoke 3, and a rotating shaft 11 is rotatably supported by the bearings 6 and 9.

A laminated core 12 is fixed to the rotating shaft 11. The laminated core 12 includes a plurality of core sheets 13 as shown in FIGS. Core sheet 13
Has six teeth 13a extending radially from the center thereof and at equal angular intervals. Each tooth piece 1
A projection 13 extending in an arc shape on both sides is provided at the tip of 3a.
b is formed. In the center of the core sheet 13, a through-hole 13c for penetrating the rotary shaft 11 is provided. Each of the core sheets 13 arranged at both ends has two tooth pieces 1 extending in opposite directions.
A fitting hole 13d is formed in each of 3a.

The laminated core 12 is formed by laminating a plurality of the core sheets 13 formed as described above. Incidentally, the tooth pieces 13a constitute the teeth 12a of the laminated core 12, and the space formed between the adjacent teeth 12a constitutes the slot 12b.

Further, core insulators 14 and 15 are mounted on the laminated core 12. The core insulators 14 and 15 are molded products made of an insulating thermoplastic resin, and are wound around a predetermined tooth 12a.
6 to insulate the laminated core 12 and the rotating shaft 11 from each other.

More specifically, the core insulator 14 includes:
It has a cylindrical portion 14 a that is inserted into the rotating shaft 11. At one end of the cylindrical portion 14a, a core end surface insulating portion 14b having the same shape as the end surface of the laminated core 12 is formed to extend. The core end surface insulating portion 14 b is superimposed on one end surface of the laminated core 12.

The cylindrical portion 14a of the core end surface insulating portion 14b
On the surface on the opposite side, a slot insulating portion 14c inserted from one side into each slot 12b of the laminated core 12 is formed to extend. The axial length of the slot insulating portion 14 c is set to half that of the laminated core 12. or,
The slot insulating portion 14 c has a flat cross-sectional shape of the laminated core 1.
2 has the same shape as the plane cross-sectional shape of the inner peripheral surface of the slot 12b. The slot insulating portion 14c is overlaid on the inner peripheral surface of the slot 12b of the laminated core 12.

The protrusions 1 press-fitted into the fitting holes 13d formed in the teeth pieces 13a are formed in the core end surface insulating portions 14b.
4d are provided. By press-fitting the projections 14d into the fitting holes 13d, the core insulator 14 is fixed to the laminated core 12 before the winding of the winding 16, and the winding of the winding 16 is facilitated.

The other end of the cylindrical portion 14a has a commutator 1
A cylindrical shaft core portion 14e for constituting 7 is formed to extend in the axial direction. The shaft core portion 14e has 6
The commutator pieces 18 are fixed. That is, the shaft core 14
As shown in FIG. 1, an embedding piece 18a formed on each commutator piece 18 is inserted into e.

The shaft core 14e and a part of the cylindrical portion 14a on the side of the shaft core 14e have inner diameters of the rotating shaft 11e.
Is set to be larger than the outer diameter of the gap, and the gap 19 is formed. By providing such a gap 19, no stress acts on the shaft core portion 14e when the core insulator 14 is fixed to the rotating shaft 11. Therefore, the roundness of the outer peripheral surface of the shaft core 14e, that is, the surface of the commutator piece 18 that is in contact with the brush (not shown) can be accurately maintained. Also, shaft core 1
There is no need to set the dimensions of the shaft core portion 14e in consideration of the cracks caused by the stress of 4e, and it is not necessary to form the shaft core portion 14e with high accuracy, so that the shaft core portion 14e (core insulator 14) And the formation of the shaft core 14e (core insulator 14) is facilitated. Furthermore, since the shaft core 14e is easily bent to the outer diameter side, even if stress such as vibration or centrifugal force is applied to the winding 16, the shaft core 14e absorbs the stress, and the stress applied to the winding is reduced.

On the other hand, as shown in FIG. 3, the core insulator 15 has a cylindrical portion 15a fitted into the rotary shaft 11.
And a core end surface insulating portion 15b and a slot insulating portion 15c which are formed to extend to the cylindrical portion 15a and have the same shape as the core insulator 14. The core insulator 15 has the slot insulating portion 15c inserted into each slot 12b of the laminated core 12 from the other side.

Similarly, a convex portion 15d press-fitted into a fitting hole 13d (see FIG. 1) provided in the tooth piece 13a is also provided on the core end surface insulating portion 15b of the core insulator 15.
Is provided. By press-fitting the protrusions 15d into the fitting holes 13d, the core insulator 15 is fixed to the laminated core 12 before the winding of the winding 16, and the winding of the winding 16 is facilitated.

The core insulators 14 and 15 configured as described above are mounted on the laminated core 12 and are used to insulate the winding 16 (the rotating shaft 11, both end surfaces of the laminated core 12, and the inner peripheral surface of the slot 12b). ) And the winding 16 are coated so as to be insulated. After the core insulators 14 and 15 are mounted, the winding 16 is wound between the predetermined teeth 12a, and the terminal (not shown) of the winding 16 is connected to the corresponding commutator piece 18. At this time,
The core insulators 14 and 15 are provided with wound windings 16.
Is securely fixed to the laminated core 12.

As described above, according to the present embodiment,
It has the following effects. (1) The core 1 of the commutator 17 is attached to the core insulator 14.
4e is integrally formed, so that the commutator 17 (the shaft core 14e)
Can be omitted, and the cost of the motor 1 can be reduced.

(2) Since the gap 19 is provided between the shaft core 14 e of the commutator 17 and the rotating shaft 11 of the rotor 10, no stress acts on the shaft core 14 e when the core insulator 14 is fixed. Accordingly, it is possible to accurately maintain the roundness of the outer peripheral surface of the shaft core portion 14e, that is, the surface of the commutator piece 18 provided on the outer peripheral surface, which is in sliding contact with the brush. Also, shaft core 1
There is no need to set the dimensions of the shaft core 14e in consideration of the cracks caused by the stress of 4e, and it is not necessary to form the shaft core 14e with high accuracy. And the formation of the shaft core 14e (core insulator 14) is facilitated. As a result, the cost of the core insulator 14 and the cost of the motor 1 can be reduced. Further, since the shaft core portion 14e easily bends to the outer diameter side, even if stress such as vibration or centrifugal force is applied to the winding 16, the shaft core portion 14e absorbs the stress, and the stress applied to the winding can be reduced. it can.

(3) The core insulator 14 is a cylindrical portion 14a which is provided continuously with the shaft core portion 14e and covers the rotating shaft 11.
A core end surface insulating portion 14b connected to the cylindrical portion 14a and covering one end surface of the core 12; a core end surface insulating portion 14b connected to the core end surface insulating portion 14b and inserted into the slot 12b;
And a slot insulating portion 14c that covers the inner peripheral surface of the slot. Accordingly, one molded product can cover the rotating shaft 11 between the commutator 17 and the core 12, one end surface of the core 12, and the inner peripheral surface of the slot 12b of the core 12.

(4) The core insulator 14 includes the core 1
2 has a convex portion 14d which is press-fitted into the fitting hole 13d, and the convex portion 14d is press-fitted into the fitting hole 13d.
Before the winding of the core 12, the core insulator 14
Fixed to Therefore, the winding operation of the winding 16 is facilitated.

(5) Since the core insulator 14 is securely fixed to the core 12 by the tension of the wound winding 16, no special means for fixing is required. (6) The embedded piece 18 of each commutator piece 18 is provided in the shaft core 14e.
a is inserted and each commutator piece 18 is fixed. Therefore, there is no need to attach each commutator piece 18 to the shaft core portion 14e, so that the commutator 17 can be easily assembled.

The embodiment of the present invention may be modified as follows. In the above embodiment, the core insulator 14 is configured as shown in FIG.
The configuration is not limited to this configuration as long as the shaft core portion 14e is integrally formed. For example, the following configuration may be used.

The slot insulating portion 14c of the core insulator 14 may be slightly longer than the axial length of the core 12. If the core insulator 14 can be fixed to the core 12 by inserting the slot insulating portion 14c into the slot 12b, the projection 14d and the fitting hole 13d of the core 12 need not be provided. That is, the slot insulating portion 14c may be used as the fixing means.

If the loose fitting of the core insulator 14 to the core 12 does not adversely affect the winding operation of the winding 16, the fixing means (the protrusion 14 d and the fitting hole 13
It is not necessary to provide d). In this case, when the winding 16 is wound around the core insulator 14, the core insulator 14 is securely fixed to the core 12 by the tension of the wound winding 16. Therefore, the core insulator 14 does not shift in the circumferential direction or the axial direction.

Further, the slot insulating portion 14c may be provided separately. Further, although the commutator piece 18 is insert-fixed to the shaft core portion 14e, it may be fixed using other fixing methods.

Although the gap 19 is provided between the shaft core 14e and the rotating shaft 11, it may not be provided. In the above embodiment, the core 12 including the six teeth 12a (slots 12b) is used, but the number is not limited to this. Note that the teeth 12a (slot 1
When the number 2b) is changed, it is necessary to change the shapes of the core end surface insulating portion 14b and the slot insulating portion 14c according to the numbers.

The technical ideas other than the claims that can be understood from the above embodiments will be described below together with their effects. (A) A motor having a rotor obtained by mounting the rotor insulator for a motor according to any one of claims 1 to 5 to the rotor. By doing so, the operation step of fixing the commutator can be omitted, so that the cost of the motor can be reduced.

[0038]

As described in detail above, according to the present invention,
It is possible to provide a motor rotor core insulator that can reduce the cost of the motor.

[Brief description of the drawings]

FIG. 1 is a sectional view of a DC motor according to an embodiment.

FIG. 2 is a perspective view of a rotor.

FIG. 3 is a perspective view of a core insulator and a laminated core.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motor, 10 ... Rotor, 12 ... Laminated core as core, 12a ... Teeth, 12b ... Slot, 14a ... Cylindrical part as insulating part, 14b ... Core end surface insulating part as insulating part, 14c ... Insulating part Slot insulation, 14
d: convex portion constituting fixing means, 14e: shaft core portion, 16 ...
Winding, 17: commutator, 18: commutator piece, 18a: embedded piece, 19: gap.

Continued on the front page F term (reference) 5H604 AA08 BB01 BB14 BB17 CC02 CC14 DB01 PC01 QA01 QB17 5H615 AA01 BB01 BB04 BB14 BB16 PP02 PP08 PP12 PP24 PP26 QQ19 RR02 SS05 SS11 SS19 TT03 TT32 5H623 GG10

Claims (5)

[Claims] 1. A core insulator for a rotor of a motor to be mounted on a rotor of a motor having a commutator, wherein the insulating portion covers and insulates a predetermined portion with which a winding wound around the core of the rotor can come into contact. A core insulator for a rotor of a motor, comprising: a shaft portion of the commutator integrally formed with the insulating portion. 2. The rotor core insulator for a motor according to claim 1, wherein a gap is provided between the shaft core and a rotation shaft of the rotor. 3. The core insulator for a motor rotor according to claim 1, wherein the core includes a plurality of teeth around which the winding is wound, and the insulating section includes the shaft core. A cylindrical portion, which is connected to the portion and covers the rotation axis of the rotor; a core end surface insulating portion, which is connected to the cylindrical portion and covers one side end surface of the core; A core insulator for a motor rotor, the slot insulator being fitted into a slot between the teeth and covering an inner peripheral surface of the slot. 4. The core insulator for a motor rotor according to claim 1, wherein said insulating portion has a fixing means for fixing to said core before winding of said winding. A core insulator for a rotor of a motor, comprising: 5. The motor rotor core insulator according to claim 1, wherein said commutator includes a plurality of commutator pieces each having an embedded piece. A core insulator for a motor rotor, wherein an embedded piece of each commutator piece is inserted into a core portion and each commutator piece is fixed.