JP2003324872A - Armature for rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce core loss, inductance and cogging torque caused by an eddy current of an armature, when constituting the armature by externally fitting an armature core formed by laminating a plurality of pieces of core materials with a plurality of teeth radially formed at its external periphery to an armature shaft. <P>SOLUTION: The core material 3 is formed, such that a long claw 3g is formed at the tip of a base 3f in the circumferential direction; and a first tooth 3d, wherein a notch 3h is formed at the center of the claw 3g in the circumferential direction toward an inner diameter side and a second tooth 3e, wherein a claw is not formed are alternately formed in the circumferential direction. The core materials 1 are laminated, in a state such that the first tooth 3d and the second tooth 3e are alternately aligned in parallel in the axial direction of the armature shaft 2. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of an armature of a rotary electric machine that constitutes an actuator mounted on a vehicle.

[0002]

2. Description of the Related Art Generally, an armature of this type of rotating electric machine has an armature core formed by laminating a plurality of core materials having a plurality of teeth radially formed on the outer periphery of the armature. It is configured by winding a coil in a coil groove formed in the axial direction and long in the axial direction. When the coil of the armature is energized, the excited coil is attracted to the permanent magnet arranged on the inner peripheral surface of the yoke that houses the armature, thereby rotating the armature. There is. By the way, the conventional core material has a disc-shaped boss portion having a through hole through which an armature shaft penetrates in the central portion, a base portion radially protruding from the outer periphery of the boss portion, and a circumferential direction at the tip of the base portion. And a plurality of teeth formed by a claw portion extending in a long direction, and the groove opening width in the circumferential direction of the coil groove formed between the teeth is equal to the width between the adjacent claw portions. It is set in between. In a rotary electric machine equipped with an armature formed by using such a core material, reducing iron loss, inductance, and cogging torque due to eddy currents is a problem, and various measures have been taken in the past. Has been.

[0003]

That is, as measures for reducing iron loss due to overcurrent, it is proposed to reduce the thickness of the core material, change the material of the core material, etc. There is a problem of cost increase. In addition, as a measure to reduce the inductance, it is proposed to reduce the number of windings when winding the coil in the coil groove, while increasing the magnetic flux of the permanent magnet on the yoke side. There is a problem such as that, and by doing so, the iron loss and the cogging torque increase. Furthermore, as a measure to reduce the cogging torque, when the core materials are laminated, the claws of the teeth are slightly shifted so that the coil grooves are inclined to the outer circumference of the armature core with respect to the axial direction, and It is proposed to mitigate the change in magnetic resistance that occurs between the end and the circumferential direction end of the tooth.In this case, however, the effective magnetic flux is reduced and the motor characteristics are inferior. In addition to the problem that the winding state of No. 1 deteriorates, there is also the problem that the inductance cannot be reduced.
In this way, each of these reduction measures has its own problems, and by solving one, other problems will increase further, and it is difficult to improve as a whole. There was a problem to be solved by the invention.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances as described above with the object of solving these problems, and an armature in which a plurality of teeth are radially formed on the outer circumference is provided. In an armature of a rotating electric machine, which comprises a plurality of core materials of a core fitted onto an armature shaft in a laminated manner, the core material has a claw portion which is long in the circumferential direction at the tip, and the circumference of the claw portion. First teeth having a notch portion cut out toward the inner diameter side in the center portion in the circumferential direction, and second teeth in which the claw portions are not formed are alternately formed in the circumferential direction, and first, The second teeth are laminated so as to be alternately juxtaposed in the axial direction of the armature shaft. By doing so, it is possible to reduce iron loss, inductance, and cogging torque due to eddy currents. In this, the width in the circumferential direction of the second tooth of the present invention may be constant and set to the same dimension as the base width of the first tooth. Further, in this, the circumferential width of the first tooth notch portion of the present invention can be set to be substantially the same as the circumferential width of the second tooth. Moreover, in this thing, the radial length of the 1st and 2nd teeth of this invention is set to the same dimension, and it shall be comprised so that the 2nd tooth may face from the notch part of the 1st tooth. You can Furthermore, in this structure, the coil groove formed between the first and second teeth adjacent to each other in the circumferential direction of the present invention is formed long in the armature axial direction with the circumferential width of the groove opening being displaced. The facing dimension of the adjacent claw portions in the circumferential direction can be set to be approximately the same as the circumferential width of the first tooth cutout portion.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to FIG.
~ It demonstrates based on the drawing shown in FIG. In the drawing,
Reference numeral 1 denotes an armature that constitutes an electric motor as a rotating electric machine, and the armature 1 has an armature core 2 formed on the outer periphery of an armature shaft 2 by laminating a plurality of thin plate-shaped core materials 3 described later. The core member 3 is fixed in a fitting shape, and a coil (not shown) is wound around a coil groove (slot) 3a formed in the outer periphery of the core material 3 in the axial direction of the armature shaft 2. Then, by connecting the end portion of the coil to the riser 4a of the commutator 4 externally fitted and fixed to one end portion of the armature shaft 2, in a conductive manner,
External power is supplied to the commutator 4 and the coil via a brush (not shown) on the motor yoke side.

Each of the core members 3 is formed in a flat plate ring shape, and a boss portion 3c having a through hole 3b formed therein for inserting the armature shaft 2 therein, and an outer periphery of the boss portion 3c. In addition, the first and second teeth 3d and 3e are formed so as to radially project toward the outer diameter side.
The first teeth 3d have a base portion 3f dimensioned to have a circumferential width H protruding in the outer diameter direction from the boss portion 3c, and extend long from the outer diameter side end portion of the base portion 3f to both sides in the circumferential direction. And a claw portion 3g. Further, the first tooth claw portion 3g is formed with a notch portion 3h which is notched in a V shape toward the inner diameter side around the middle portion in the circumferential direction, and the circumferential opening of the notch portion 3h. The width W is set so as to substantially correspond to the circumferential width H of the base portion 3f. On the other hand, the second tooth 3e is the first tooth 3d.
The second tooth 3e has a shape in which the base 3f of the first tooth 3d is extended as it is, and the second tooth 3e has a structure without a claw (the claw is It is a missing structure). The first and second teeth 3d and 3e are alternately formed in the circumferential direction, and in the present embodiment, six first and second teeth 3d and 3e are provided, and a total of 12 Individual teeth are formed at equal pitches in the circumferential direction.

Then, the armature core is made of each core material 3
Is formed by shifting the first and second teeth 3d, 3e by one pitch in the circumferential direction, and the first teeth 3d and the second teeth 3e are externally fitted to the armature shaft 2. When it is opened, it is in a state of being alternately arranged in the axial direction. As a result, the circumferentially opposite side portions of the claw portion 3g are not laminated in an abutting manner in the axial direction, and are laminated with a gap corresponding to the plate thickness of one core material 3, The intermediate portion of the claw portion 3g in the circumferential direction is set so as to be laminated with the second teeth 3e having a constant width interposed therebetween. In the armature 1 configured in this manner, the first teeth base portions 3f and the second teeth 3e, which are arranged in parallel in the axial direction, exactly overlap each other in the circumferential direction, as shown in FIGS. 3 and 4. From the first tooth notch 3h to the second tooth 3
It is set so that the tip portion of e can be seen. And
In the armature core, the coil is wound around the coil groove 3 formed between the first and second teeth 3d and 3e. At this time, the circumferential groove width of the coil groove 3a of each core material 3 is The second tooth 3e is longer by the amount by which the claw portion is not formed (the amount by which it is missing). By disposing the long coil grooves 3a in such a manner that they are displaced from each other in the axial direction, the facing gap (circumferential direction) between the adjacent claw portions 3g is provided at the central part in the circumferential direction. A central groove that corresponds to the width and communicates in the axial direction is formed, and the central groove is set to correspond to the groove opening of the conventional coil groove. Incidentally, the circumferential width at the groove opening of the central groove of the coil groove 3a is the circumferential width H of the first tooth base 3f and the second tooth 3e, that is,
The size is set to be substantially equal to the opening width of the cutout portion 3g formed in the first tooth 3d.

In the embodiment of the present invention configured as described above, when a coil (not shown) wound in the coil groove 3a of the armature 1 is energized, the coil is excited and the armature 1 rotates (motor drive). However, in this one, the core 3 material constituting the armature 1 has the first teeth 3d in which the notch 3h is formed in the claw 3g.
And the second teeth 3e having a constant width and having no claw portion are alternately formed in the circumferential direction, and the armature 1
The second teeth 3d and 3e are arranged alternately in the axial direction. And the loss of the second tooth 3e,
That is, in the part where the claw portion is missing, the magnetic flux of the magnetic pole facing the part passes through the claw portion 3g of the first tooth 3d adjacent to the second tooth 3e, so that the reduction of the effective magnetic flux is reduced. be able to. Moreover, in the second teeth 3e formed in a narrow width shape in the circumferential direction, there is little change in magnetic flux, and the claws 3g adjacent to each other in the axial direction of the armature shaft 2 have a gap corresponding to the thickness of the core material 3. Since the layers will be stacked in a vacant state, it is possible to reduce iron loss due to eddy current, and improvement of motor characteristics can be expected. Further, in this configuration, the groove opening width in the circumferential direction of the coil groove 3c formed between the first and second teeth 3d and 3e adjacent to each other in the circumferential direction corresponds to the amount that the claw portion is not formed in the second tooth 3e. Although it becomes larger, the groove opening width is formed such that it is displaced in the circumferential direction for each plate thickness, as shown in FIG. Therefore, the inductance can be reduced, and the change in magnetic resistance can be mitigated to reduce the cogging torque.

Next, the graph of FIG. 5 will be described. The graph is composed of an electric motor having an armature core composed of the core material 3 and the core material of the prior art. The present invention when the effective magnetic flux, the iron loss, the cogging torque, the torque unevenness, the inductance, and the weight of the armature are each measured using an electric motor including an armature core, and the measured value in the conventional electric motor is set to 1. The conversion value of each measured value of the electric motor of is shown. As is clear from this graph, the effective magnetic flux is hardly reduced, and the measured values for iron loss and cogging torque are significantly reduced compared to conventional electric motors. It has been demonstrated that it can be effectively reduced. It has also been proved that torque unevenness, inductance, and armature weight are also reduced.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of an armature.

2A and 2B are respectively a front view of a core material and a cross-sectional view taken along line XX of FIG. 2A.

FIG. 3 is a front view showing a state in which an armature core is incorporated in an armature shaft.

FIG. 4 is a development pattern diagram for explaining a laminated state of core materials forming the armature core.

FIG. 5 is a graph comparing the characteristics of the electric motor of the present invention and the electric motor of the conventional product.

[Explanation of symbols]

1 Armature 2 Armature axis 3 core material 3b through hole 3d first teeth 3e Second Teeth 3f base 3g claw 3h notch

Claims (5)

[Claims] 1. In an armature of a rotating electric machine, wherein a plurality of core material of an armature core having a plurality of teeth radially formed on the outer periphery are externally fitted to an armature shaft in a laminated manner. A first tooth in which a long claw portion is formed in the circumferential direction, and a cutout portion cut out toward the inner diameter side is formed in the circumferential direction central portion of the claw portion,
An armature for a rotating electric machine, in which second teeth having no claw portion are alternately formed in a circumferential direction, and first and second teeth are laminated so as to be alternately arranged in the axial direction of the armature shaft. 2. The armature for a rotary electric machine according to claim 1, wherein the circumferential width of the second teeth is constant and is set to have the same dimension as the base width of the first teeth. 3. The armature for a rotating electric machine according to claim 1, wherein the circumferential width of the first tooth notch portion is set to be substantially the same as the circumferential width of the second tooth. 4. The method according to claim 1, 2 or 3,
The armature of a rotating electric machine is configured such that the radial lengths of the second teeth are set to be the same, and the second teeth are exposed from the cutout portion of the first teeth. 5. The coil groove formed between the first and second teeth adjacent to each other in the circumferential direction according to claim 1, 2, 3 or 4, wherein the circumferential width of the groove opening is displaced. The armature of a rotating electric machine, which is formed to be long in the axial direction and has a facing dimension with respect to the adjacent claw portions in the circumferential direction that is substantially the same as the circumferential width of the first tooth cutout portion.