JP3097727B2 - Commutator type rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commutator type rotary electric machine having a commutator.

[0002]

2. Description of the Related Art A conventional commutator of a commutator-type rotating electric machine has a plurality of commutator pieces that are electrically insulated from a rotating shaft and are arranged in the axial direction around the rotating shaft. JP 63
Japanese Patent Application Laid-Open No. 194541 discloses that a brush contact portion extending outward in the axial direction is partially buried in a surface portion of a mold resin tube (insulating material) fitted on a rotating shaft, and a circumferential direction is provided inside the mold resin tube. An inner conductor extending in the axial direction while sloping is embedded, and the outer riser portion is radially extended from one end of the brush contact portion, and between the outer riser portion and the armature core, while being electrically insulated from both. A commutator piece is disclosed in which an inner riser portion extends radially from one end of the inner conductor. By doing so, the coil end can be omitted.

Further, as shown in FIGS. 10 and 11, there is also known a surface type commutator in which commutator pieces are radially arranged in a radial direction. In the surface type commutator, the commutator piece does not have to be carried on the outer peripheral portion of the mold resin cylinder, and thus the commutator piece itself is advantageous in high-speed rotation.

[0004]

However, commutator-type small DC motors used in automobile starters and the like are required to be particularly small, light and large in output, and as a result, the temperature of each part during operation is significantly increased. . In particular, the mold resin tube carrying the commutator piece on its outer periphery must hold the commutator piece against its centrifugal force, and furthermore, the effect of resistance heat of the commutator piece and frictional heat generated by the brush. Large thermal and mechanical loads.

Further, in the surface type commutator, the armature coil is bent at a required pitch by a coil end receiving space 80 shown in FIG. 11 of the armature coil from the end face of the armature core. It is necessary to dispose the type commutator and further arrange the brush laterally outside the commutator, and there is a problem that the axial length, the size and the weight of the motor increase. There is also a problem that the high-speed rotation of the motor is limited by the centrifugal force applied to the coil end 30. Further, FIG.
As shown in the figure, the gap 42 between the adjacent commutator pieces 42 ′
Since b 'is constant from the radially inner end to the radially outer end, the weight of the radially outer end of the commutator piece 42' is large, and it is necessary to ensure sufficient centrifugal strength.

On the other hand, since the commutator element disclosed in the above publication has a large-diameter riser portion, the centrifugal force of the commutator element, which is proportional to the square of the radius, is significantly increased, and the mold resin supporting the commutator element is larger than the conventional technique. The problem is that the load on the cylinder is large and the motor cannot rotate at high speed. In addition, the commutator piece, that is, both the brush contact portion and the inner conductor, must be carried in two stages in the radial direction in the mold resin cylinder, and the burden on the mold resin cylinder becomes more severe than in the conventional case. I have. In addition, since the frictional heat generated at the brush contact portion due to friction with the brush needs to be transmitted to both riser portions, the temperature of the mold resin tube supporting the brush contact portion and the inner axial conductor portion becomes considerably high. I will. Furthermore, since the inner conductor must be obliquely provided in the circumferential direction, there is a problem that the axial length of the molded resin cylinder cannot be shortened.

The present invention has been made in view of the above problems, and has as its object to provide a commutator-type rotating electric machine that can rotate at high speed and can be reduced in size and weight.

[0008]

In order to achieve the above object, according to the present invention, in a commutator type rotating electric machine having a commutator, a commutator piece is provided extending along an end face of an armature core. None, a plurality of outer conductors whose radial outer ends are respectively connected to the armature coils, and whose axial outer end surfaces form brush sliding surfaces, between the end surfaces of the armature core and the plurality of outer conductors. A plurality of inner conductors that are provided along the end surface and whose radial outer ends are respectively connected to the armature coils, a radial inner end of the inner conductors, and a radial inner end of the outer conductors. And an inner end connecting portion for connecting
An insulator that electrically insulates the plurality of inner conductors from the armature core and the plurality of outer conductors, wherein at least one of the plurality of outer conductors and the plurality of inner conductors is formed in a substantially spiral shape and adjacent to each other A configuration is adopted in which a gap formed between the plurality of outer conductors is made larger on the radially outer end side than on the radially inner end side.

According to a second aspect of the present invention, in the commutator-type rotary electric machine having a commutator, each of the commutator pieces extends along the end face of the armature core to form a commutator piece, and the radially outer end is connected to the armature coil. A plurality of outer conductors whose axial outer end faces form a brush sliding contact surface, and are provided along the end face between the end face and the plurality of outer conductors of the armature core, and the radial outer end is A plurality of inner conductors respectively connected to the armature coil, an inner end connecting portion connecting a radial inner end of the plurality of inner conductors and a radial inner end of the plurality of outer conductors, and the plurality of inner conductors; An insulator for electrically insulating the conductor from the armature core and the plurality of outer conductors, wherein at least one of the plurality of outer conductors and the plurality of inner conductors is formed in a substantially spiral shape, and Diameter circumferential width From Mukonai end side to the radially outer end side is adopted a structure which is characterized in that the substantially the same.

According to a third aspect of the present invention, in the commutator-type rotating electric machine according to the first or second aspect, the plurality of inner conductors and the plurality of outer conductors are fixed to the armature core by the insulator made of resin. Is adopted. According to claim 4, in the commutator-type rotating electric machine according to claim 1 or 2, the insulator is an air layer, and the plurality of inner conductors are electrically insulated from the armature core and the plurality of outer conductors. Features a characteristic configuration.

According to a fifth aspect of the present invention, in the commutator-type rotating electric machine according to any one of the first to fourth aspects, the plurality of inner conductors and the plurality of outer conductors are locked to a rotating shaft to form the armature core. And a narrow pressure portion for fixing and fixing the pressure. According to a sixth aspect of the present invention, in the commutator-type rotary electric machine having a commutator, each of the commutator pieces extends along the end face of the armature core to form a commutator piece, and the radially outer ends are connected to the armature coils, respectively. A plurality of outer conductors whose outer end faces form a brush sliding surface, and interposed along the end face between the end face and the plurality of outer conductors of the armature core, and a radial outer end is the armature coil. A plurality of inner conductors respectively connected to, an inner end connection portion for connecting a radial inner end of the plurality of inner conductors and a radial inner end of the plurality of outer conductors, and the plurality of inner conductors, An armature core and a resin layer or an air layer electrically insulating from the plurality of outer conductors, wherein at least one of the plurality of outer conductors and the plurality of inner conductors is formed in a substantially spiral shape, and the plurality of outer conductors adjacent to each other are formed. With conductors Employs a configuration which is characterized in that a larger than the radial inner end side as a radially outer end side clearance made.

According to a seventh aspect of the present invention, in the commutator-type rotary electric machine having a commutator, each of the commutator pieces is extended along the end face of the armature core to form a commutator piece, and the radially outer end is connected to the armature coil. A plurality of outer conductors whose axial outer end faces form a brush sliding contact surface, and are provided along the end face between the end face and the plurality of outer conductors of the armature core, and the radial outer end is A plurality of inner conductors respectively connected to the armature coil, an inner end connecting portion connecting a radial inner end of the plurality of inner conductors and a radial inner end of the plurality of outer conductors, and the plurality of inner conductors; A resin layer or an air layer that electrically insulates the conductor from the armature core and the plurality of outer conductors, wherein at least one of the plurality of outer conductors and the plurality of inner conductors is formed in a substantially spiral shape, and Outer conductor Employs a configuration which is characterized in that the substantially the same direction of the width from the radially inner end side to the radially outer end side.

[0013]

According to the present invention, since the coil end can be omitted in the first aspect, the high-speed rotation is not restricted by the anti-centrifugal force, and the axial length and physical size of the motor are not restricted. , Can reduce weight. Further, it is not necessary to carry the outer conductor on the surface portion of the mold resin cylinder as in the related art, and the mold resin cylinder itself becomes unnecessary, so that the thermal and mechanical loads of the conventional mold resin cylinder are eliminated. Thus, high-speed rotation and high output are not restricted, and the axial length, physique, and weight of the motor can be reduced by the omission of the mold resin cylinder. In addition, the frictional heat generated by the brush is generated in the outer conductor, which can be cooled well by the airflow generated in the centrifugal direction along the surface, and which has a large heat capacity. The commutator does not limit the heat-resistant temperature of the motor. Further, the plurality of outer conductors are formed in a substantially spiral shape, and the gap formed between the plurality of adjacent outer conductors is larger on the radially outer end side than on the radially inner end side. Since the weight of each end can be reduced, the centrifugal force generated in the outer conductor itself can also be reduced, and damage to the outer conductor can be prevented even during high-speed rotation. The effects described above are suitable, for example, for a fully-closed starter motor, and when the speed reduction mechanism is employed to reduce the size and speed, the effects are enormous.

According to the second aspect, since the coil end can be omitted, the high-speed rotation is not restricted by the anti-centrifugal force, and the axial length, the size and the weight of the motor can be reduced. Also, there is no need to carry the outer conductor on the surface of the mold resin cylinder, and the mold resin cylinder itself is not required. Therefore, high-speed rotation and high output can be achieved by the thermal and mechanical loads of the mold resin cylinder. The motor is not restricted, and the axial length, physique and weight of the motor can be reduced by the omission of the mold resin cylinder. Furthermore, since the plurality of outer conductors are formed in a substantially spiral shape and the circumferential width of the plurality of outer conductors is substantially the same from the radial inner end side to the radial outer end side, friction heat generated by the brush is reduced. The outer conductor is uniform, that is, the temperature distribution of the frictional heat in the outer conductor is uniform, and the frictional heat is not concentrated only on a specific part of the outer conductor, so the inside of the insulator holding the outer conductor is Can be reduced. Also, since the area of the outer conductor in contact with the brush is substantially the same on the radial inner end side and the radial outer end side, the current density of the brush is also uniform, so that commutation is improved and uneven wear of the outer conductor is reduced. Of course, uneven wear of the brush can also be suppressed.

According to the third aspect of the present invention, the plurality of inner conductors and the plurality of outer conductors are fixed to the armature core by an insulator made of resin, so that the fixing surface is widened and the centrifugal force of both conductors is reduced by the fixing surface. By acting as a shearing force on, the solid can be firmly fixed and the centrifugal strength can be further improved. According to the fourth aspect, since the insulator is an air layer and the plurality of inner conductors are electrically insulated from the armature core and the plurality of outer conductors, the frictional heat generated by the brush is transferred from the outer conductor to the inner conductor via the air layer. As a result, the temperature of the inner conductor does not become extremely high, and the rotation speed can be increased.

According to the fifth aspect of the present invention, since a plurality of inner conductors, a plurality of outer conductors, and a narrow pressure portion for narrowing and fixing the armature iron core are provided, the conductors are firmly fixed by frictional force. In addition, it can be easily fixed, and the centrifugal strength can be sufficiently improved. According to the sixth aspect, since the coil end can be omitted, the high-speed rotation is not restricted by the centrifugal resistance, and the axial length, the size, and the weight of the motor can be reduced. Also, there is no need to carry the outer conductor on the surface of the mold resin cylinder, and the mold resin cylinder itself is not required. Therefore, high-speed rotation and high output can be achieved by the thermal and mechanical loads of the mold resin cylinder. The motor is not restricted, and the axial length, physique and weight of the motor can be reduced by the omission of the mold resin cylinder. Further, by forming the resin layer, the armature iron core, the inner conductor and the outer conductor are fixed to each other, thereby improving centrifugal resistance, or by forming the air layer, frictional heat generated by the brush can be removed from the outer conductor to the air layer. , The temperature of the inner conductor does not become extremely high, and high-speed rotation can be achieved.

According to the seventh aspect, since the coil end can be omitted, the high-speed rotation is not restricted by the anti-centrifugal force, and the axial length, size and weight of the motor can be reduced. It is not necessary to carry the outer conductor on the surface of the mold resin cylinder, and the mold resin cylinder itself becomes unnecessary, so that high-speed rotation and high output can be achieved by the thermal and mechanical load of the mold resin cylinder. Is not restricted, and the axial length, physique and weight of the motor can be reduced by the omission of the mold resin cylinder. Further, by forming the resin layer, the armature iron core, the inner conductor and the outer conductor are fixed to each other, thereby improving centrifugal resistance, or by forming the air layer, frictional heat generated by the brush can be removed from the outer conductor to the air layer. , The temperature of the inner conductor does not become extremely high, and high-speed rotation can be achieved.

[0018]

【Example】

(Embodiment 1) FIGS. 1 to 4 show an example in which the present invention is applied to a DC motor of an automotive starter. FIG. 2 shows the first embodiment of the present invention.
1 is an axial cross-sectional view of a commutator type rotating electric machine according to an embodiment.
An armature core 11 formed by laminating a plurality of disk-shaped steel plates is fitted in a substantially central portion of the rotating shaft 10, and a plurality of slots 12 are formed on an outer peripheral surface of the armature core 11. , Armature coils 20, 21 are wound up and down in two stages. 20 is also called an upper conductor, and 21 is also called a lower conductor. The right end face of the armature core 11 has a commutator section 4 described later.
Are formed to constitute an armature (rotor) of the electric motor. Reference numeral 13 denotes a gear provided on the rotating shaft 10, which meshes with a gear of a not-shown reduction mechanism (for example, a planetary gear reduction mechanism) and transmits the rotation of the rotating shaft 10 to the not-shown gear. Both ends of the rotating shaft 10 are supported by a bearing 61 attached to an end frame 60 of the electric motor and a bearing 62 attached to a member (not shown). The end frame 60 shields an opening of a yoke 50 made of a cylindrical steel plate. doing. A magnetic pole core 52 on which a field coil 51 is wound is provided on the inner peripheral surface of the yoke 50 so as to be close to the periphery of the armature core 4.
The yoke 50, the field coil 51, and the magnetic pole core 52 form a stator.

A brush holder 70 is provided on the end frame 60.
Is fixed, and a brush 71 is slidably held in the inside thereof. The brush 71 is pressed against a commutator piece (outer conductor) 42 of the commutator portion 4 described later by a spring 72 provided in the brush holder 70. In this embodiment, a four-pole wound field type DC motor is described. However, the present invention is not limited to this, and a magnet field type DC motor that generates a field magnetic field other than four poles is also applicable. Obviously, the present invention can be applied to other AC commutator motors.

Next, the commutator 4 and the armature coil 2 will be described in more detail. An insulator is provided on the right end face of the armature core 11.
For example, the inner conductor 41 is fixed with the resin-based insulating material 41a interposed therebetween, and the outer conductor 42 is also fixed on the surface thereof with the same insulator, for example, the resin-based insulating material 42a interposed therebetween. The resin-based insulating material 41a, the inner conductor 41, the resin-based insulating material 42a and the outer conductor 42 constitute a commutator 4, and the resin-based insulating material 41a and the resin-based insulating material 42a constitute an insulator referred to in the present invention. ing.

Although only one of the inner conductor 41 and the outer conductor 42 is shown in cross section in FIG. 2, each of them is spirally arranged in the axial direction. FIG. 1 shows the outer conductor 42.
The following shows the arrangement. 42b is a groove between adjacent outer conductors 42. The groove 42b between the adjacent outer conductors 42 is
L1 is at the position where the diameter is small, L2 is at the position where the diameter is large, and the relationship between the dimensions L1 and L2 is L2> L1.
It is. The inner conductor 41 and the outer conductor 42 are formed by stamping a copper plate, but can be manufactured at low cost by adopting another manufacturing method, for example, a method of bending a copper strip to eliminate waste material.

Therefore, the outer conductor 42 extends along the right end face of the armature core 11 to form a commutator piece, and the outer end face in the axial direction forms a brush sliding surface. The width of the outer conductor 42 is made substantially uniform by widening the gap between the outer conductors 42 at the radially outer end side, so that the area of the sliding contact portion with the brush is also at the radially inner end side and the radially outer end side. It can be made substantially uniform.
The inner conductor 41 is provided radially outward between the armature core 11 and the outer conductor 42. The radial inner ends of the outer conductors 42 and the radial inner ends of the inner conductors 41 are individually and electrically connected. In this embodiment, the radial inner ends of the outer conductor 42 and the inner conductor 41 are:
The resin insulating material 42 is stamped in a direction approaching each other.
Contact protrusions are formed by the thickness of a.
The two conductors 41 and 42 are pressed toward the armature core 11 while the contact protrusions are in contact with each other, thereby ensuring contact.

The connection may be connected by welding, brazing, soldering or the like. An upper conductor 20 and a lower conductor 21 are inserted into a pair of upper and lower conductors in each slot 12 of the armature core 11, and a radially outer end of each outer conductor 42 is welded to an end of the upper conductor 20. The radial outer end of the inner conductor 41 is welded to the end of the lower conductor 21. of course,
Instead of welding, brazing, soldering, pressing contact, etc. may be employed.

Thus, a single wave winding is completed. Of course, various other winding types such as lap winding can be naturally used. FIG. 3 shows an electrical connection diagram of the armature of the present invention, in which a solid line portion represents the upper conductor 20 and a broken line portion represents the lower conductor 21, and X is connected on the opposite side of the commutator 4. The back pitch is the pitch between the upper conductor (armature coil) 20 and the lower conductor (armature coil) 21. Y is an upper conductor (armature coil) 20 and a lower conductor (armature coil) 21 connected on the side of the commutator 4
It is a front pitch consisting of pitches between them.

Therefore, in the conventional motor, the connection between the conductors in the slot of the armature coil 2 is made by bending the coil itself at the coil end of the armature coil. In this embodiment, as shown in FIG. Inner conductor 41 and outer conductor 42
Is replaced by a substantially spiral curve. Then, the spiral directions of the inner conductor 41 and the outer conductor 42 are opposite.
In FIG. 4, the outer conductor 42 whose inner radial end is connected to the inner radial end of the inner conductor 41 is a conductor forming the commutator. Armature coil 2 connected to the radially outer ends of inner conductor 41 and outer conductor 42
The pitch between 0 and 21 is the front pitch Y shown in FIG.

The resin-based insulating material 41a and the resin-based insulating material 42a are made of an epoxy resin. In this case, the outer conductor 42 and the inner conductor 41 are integrally formed by insert molding, and then are armatured with an adhesive. Although bonded to the right end face of the iron core 11, each may be insulated and fixed by a separate heat-resistant resin sheet material. In the insert molding, the armature iron core 11 can also be integrally molded by inserting. In the case where the centrifugal strength is not so required, the insulators are not arranged as shown in FIG.
(Air layer) for insulation.

As is clear from the above description, according to the embodiment of the present invention, the coil end of the armature coil 2 is
Since it is considered to have been converted to 1, the axial length of the armature can be significantly reduced, and the size and weight of the motor can be reduced in size and weight. In addition, the centrifugal force acts on the contact interface between the resin insulating materials 41a and 41b and the conductors 41 and 42 in a parallel direction, so that the centrifugal resistance of the commutator 4 can be improved. Further, the sliding contact area with the brush 71 can be realized without increasing the physique. Furthermore, the resistance heat and frictional heat generated in the outer conductor 42 are satisfactorily cooled by the inevitably generated centrifugal air flow, and are well absorbed by the armature core 11 having a large heat capacity through fixed heat transfer. Suitable for electric motors. In particular, when the motor is downsized and the speed is increased by adopting the speed reduction mechanism, the effect is remarkable.

According to the test results of the present inventors, 1.4 k
As a result of a comparative test with a conventional product using a W, 30-second rated motor and the same brush contact area, the conventional product had a temperature difference of 50 ° C between the armature core and the commutator section. The temperature was 15 ° C. for the product of the present invention. Further, since each outer conductor 42 is formed in a substantially spiral shape and a gap formed between adjacent outer conductors 42 is larger on the radially outer end side than on the radially inner end side, the radial direction of the outer conductor 42 is Since the outer ends can be reduced in weight, the centrifugal force generated in the outer conductor 42 itself can also be reduced, and the outer conductor 42 can be prevented from being damaged, and the brush powder accumulated in the gap is easily scattered by the centrifugal force when the motor rotates.

Further, since each outer conductor 42 is formed in a substantially spiral shape and the circumferential width of each outer conductor 42 is substantially the same, frictional heat generated by the brush 71 becomes uniform in the outer conductor 42, That is, the temperature distribution of the frictional heat in the outer conductor 42 becomes uniform, and the frictional heat does not concentrate only on a specific portion of the outer conductor 42.
The thermal stress generated inside the insulators 41a and 42a holding the pressure can be reduced. Further, since the area of the outer conductor 42 in contact with the brush 71 is substantially the same on the radial inner end side and the radial outer end side, the current density of the brush 71 is also uniform, so that rectification is improved and the outer conductor 42 is improved. Uneven wear of the brush 71 as well as uneven wear of the brush 71 can be suppressed.

(Embodiment 2) Another embodiment will be described with reference to FIG. Also in this embodiment, the inner conductor 41 is disposed on the right end surface of the armature core 11 with a sheet-shaped resin-based insulating material 41a interposed therebetween, and furthermore, the sheet-shaped resin-based insulating material 4
An outer conductor 42 is provided with 2a interposed therebetween. further,
In this embodiment, a flanged insulating resin tube (a narrow pressure portion in the present invention) 9 is press-fitted into the rotating shaft 10 from the right side, and the inner conductors 41 and the outer conductors 42 are fitted to the armature core 11 by the flanges.
Is pressed and fixed. In this way, the commutator 4 can be easily assembled, and its centrifugal resistance performance is improved.

Of course, also in this embodiment, the inner conductor 41 and the outer conductor 42 can be fixed to the resin insulating materials 41a and 42a. (Embodiment 3) Another embodiment will be described with reference to FIG. Also in this embodiment, the inner conductor 41 is disposed on the right end surface of the armature core 11 with a sheet-shaped resin-based insulating material 41a interposed therebetween, and the outer conductor 42 is further sandwiched on the surface with a sheet-shaped resin-based insulating material 42a interposed therebetween. Are arranged. Further, in this embodiment, an annular projection (a narrow pressure portion in the present invention) 91
Is protruding. Further, a resin-based insulating material 41a, an inner conductor 41, a resin-based insulating material 42a, and an outer conductor 42 are bonded to the side surfaces of the armature core 11 in advance. After the space ring 90 made of an insulating resin ring is inserted into the rotating shaft 10, the armature core 11 with the commutator 4 is pressed into the rotating shaft 10, and the commutator is formed between the armature core 11 and the annular protrusion 91. 4, that is, the outer conductor 42 and the inner conductor 41 are narrowed. Even in this case, the commutator 4 can be easily fixed. The sheet-shaped resin-based insulating materials 41a, 4a
As the 2a and the spacer ring 90, a sheet or ring of a non-resin type such as glass fiber or ceramics can be used.

When the sheet-like resin-based insulating materials 41a and 42a are used as spacers as described above, a gap between the circumferentially adjacent inner conductors 41 or a gap between the circumferentially adjacent inner conductors 41 is used. The gap (the portion of the groove 42b shown in FIG. 1) remains as a gap. These gaps can be filled by providing projections on the surfaces of the sheet-shaped resin-based insulating materials 41a and 42a. Further, the outer conductor 42 and the inner conductor 4
1 can be prevented from deforming in the circumferential direction and coming into contact with each other.

(Embodiment 4) Another embodiment will be described with reference to FIG. In this embodiment, a pipe (a narrow pressure portion in the present invention) 93 having a flange at the base end is penetrated between the armature core 11 and the rotating shaft 10, and the tip of the pipe 93 is connected to the left end of the armature core 11. It is crimped on the surface. By this caulking, the flange of the pipe 93 together with the armature iron core 11 narrows the commutator 4 through the spacer ring 90 as in the third embodiment. In this example, the same effect can be obtained.

(Embodiment 5) Another embodiment will be described with reference to FIG. In this embodiment, a threaded surface is formed on the outer peripheral surface of the rotating shaft 10, and a spacer ring (a narrow pressure portion in the present invention) 92 formed of a flanged insulating resin ring having a threaded surface formed on the inner peripheral surface. Is screwed onto the screw surface, and the commutator 4 is pressed against the armature core 11. In this example, similar effects can be obtained.

In each of the above embodiments, the inner conductor 41 and the outer conductor 42 are separately formed and fixed with the resin-based insulating material 42a interposed therebetween. However, one piece of the inner conductor 41 and one piece of the outer conductor 42 are integrated. Then, the inner conductor 41 and the outer conductor 42 may be bent. In this way, the contact resistance between the conductors 41 and 42 can be reduced.

If an insulating layer is formed on one surface of the one piece of the inner conductor 41 and the one piece of the outer conductor 42 before they are integrally punched, the insulating layer is formed when these pieces are bent. Can overlap to form a part or all of the resin-based insulating material 42a.

[Brief description of the drawings]

FIG. 1 is a layout view of an outer conductor showing a first embodiment of the present invention.

FIG. 2 is an axial sectional view of a commutator-type rotary electric machine using the outer conductor of FIG. 1;

FIG. 3 is a partial wiring diagram of an inner conductor and an outer conductor of FIG. 2;

FIG. 4 is a schematic perspective view showing an arrangement state of an inner conductor and an outer conductor of FIG. 2;

FIG. 5 is an axial sectional view of a commutator-type rotating electric machine in which the outer conductor of FIG. 1 is applied to a second embodiment.

FIG. 6 is an axial sectional view of a commutator-type rotary electric machine in which the outer conductor of FIG. 1 is applied to a third embodiment.

FIG. 7 is an axial sectional view of a commutator-type rotary electric machine in which the outer conductor of FIG. 1 is applied to a fourth embodiment.

FIG. 8 is an axial sectional view of a commutator-type rotating electric machine in which the outer conductor of FIG. 1 is applied to a fifth embodiment.

FIG. 9 is an axial sectional view of a commutator-type rotating electric machine according to another embodiment using the outer conductor of FIG. 1;

FIG. 10 is a layout diagram of commutator pieces of a conventional surface type commutator.

FIG. 11 is an axial sectional view of a commutator-type rotating electric machine using the conventional surface-type commutator of FIG. 10;

[Explanation of symbols]

 2 Armature coil 4 Commutator 9 Insulating resin tube (narrow pressure part) 11 Armature core 41 Inner conductor 41a Resin-based insulating material (insulator) 42 Outer conductor 42a Resin-based insulating material (insulator) 42b Gap 43 Inner conductor 41 Inner end connection part 44 Air gap (air layer) 45 Air gap (air layer) 71 Brush

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-194541 (JP, A) JP-A-60-156243 (JP, A) Fully open 57-159378 (JP, U) Really open Showa 51- 151901 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H02K 13/04

Claims (7)

(57) [Claims] 1. A commutator-type rotating electric machine having a commutator, which extends along an end face of an armature core to form a commutator piece, and a radially outer end is connected to an armature coil, respectively. A plurality of outer conductors each having an outer end surface forming a brush sliding surface, and a plurality of outer conductors interposed along the end surface between the end surface and the plurality of outer conductors of the armature core, and a radial outer end provided with the armature coil A plurality of inner conductors respectively connected to a plurality of inner conductors, an inner end connection portion connecting a radial inner end of the plurality of inner conductors and a radial inner end of the plurality of outer conductors, and the plurality of inner conductors, An armature core and an insulator that electrically insulates from the plurality of outer conductors, wherein the plurality of outer conductors forming a brush sliding surface are viewed in the axial direction.
A commutator-type rotating electric machine characterized by having a substantially spiral shape and a gap formed between the plurality of adjacent outer conductors being larger from a radially inner end side to a radially outer end side. 2. A commutator-type rotating electric machine having a commutator, wherein each of the commutator pieces extends along an end face of an armature core to form a commutator piece, and a radially outer end is connected to each of the armature coils. A plurality of outer conductors each having an outer end surface forming a brush sliding surface, and a plurality of outer conductors interposed along the end surface between the end surface and the plurality of outer conductors of the armature core, and a radial outer end provided with the armature coil A plurality of inner conductors respectively connected to a plurality of inner conductors, an inner end connection portion connecting a radial inner end of the plurality of inner conductors and a radial inner end of the plurality of outer conductors, and the plurality of inner conductors, An armature core and an insulator that electrically insulates from the plurality of outer conductors, wherein the plurality of outer conductors forming a brush sliding surface are viewed in the axial direction.
Wherein the plurality of outer conductors have substantially the same circumferential width from the radial inner end to the radial outer end. 3. The commutator-type rotating electric machine according to claim 1, wherein the plurality of inner conductors and the plurality of outer conductors are fixed to the armature core by the insulator made of resin. . 4. The commutator-type rotary electric machine according to claim 1, wherein the insulator is an air layer, and the plurality of inner conductors are electrically insulated from the armature core and the plurality of outer conductors. . 5. A narrow pressure portion which is locked to a rotating shaft and narrows and fixes the plurality of inner conductors and the plurality of outer conductors to the armature core. The commutator-type rotating electric machine according to any one of the above. 6. A commutator-type rotating electric machine having a commutator, wherein each of the commutator pieces extends along an end face of an armature core to form a commutator piece, and a radially outer end is connected to each of the armature coils, and is connected in an axial direction. A plurality of outer conductors each having an outer end surface forming a brush sliding surface, and a plurality of outer conductors interposed along the end surface between the end surface and the plurality of outer conductors of the armature core, and a radial outer end provided with the armature coil A plurality of inner conductors respectively connected to a plurality of inner conductors, an inner end connection portion connecting a radial inner end of the plurality of inner conductors and a radial inner end of the plurality of outer conductors, and the plurality of inner conductors, An armature core and a resin layer or an air layer electrically insulating from the plurality of outer conductors, wherein the plurality of outer conductors forming a brush sliding surface are viewed in the axial direction.
A commutator-type rotating electric machine characterized by having a substantially spiral shape and a gap formed between the plurality of adjacent outer conductors being larger from a radially inner end side to a radially outer end side. 7. A commutator-type rotating electric machine having a commutator, which extends along an end surface of an armature core to form commutator pieces, and has radially outer ends connected to armature coils, respectively, and A plurality of outer conductors each having an outer end surface forming a brush sliding surface, and a plurality of outer conductors interposed along the end surface between the end surface and the plurality of outer conductors of the armature core, and a radial outer end provided with the armature coil A plurality of inner conductors respectively connected to a plurality of inner conductors, an inner end connection portion connecting a radial inner end of the plurality of inner conductors and a radial inner end of the plurality of outer conductors, and the plurality of inner conductors, An armature core and a resin layer or an air layer electrically insulating from the plurality of outer conductors, wherein the plurality of outer conductors forming a brush sliding surface are viewed in the axial direction.
Wherein the plurality of outer conductors have substantially the same circumferential width from the radial inner end to the radial outer end.