JPH05252679A - Armature for miniature motor - Google Patents

Abstract

PURPOSE:To suppress noise of motor by setting the weight difference ratio between every conductor winding sections within 5/100 thereby improving rotational balance of armature upon finish of assembly. CONSTITUTION:Weight difference ratio for every winding section 5a, 5b, 5c, 5d, 5e, determined by multiplying the weight of conductor 5 corresponding to one turn by the number of turn of the conductor 5 at each section 5a, 5b, 5c, 5d, 5e, is set in the range of 5/100-0. Since the weight ratio of the conductor between the winding sections 5a, 5b, 5c, 5d, 5e becomes close to 1, weight imbalance does not occur between the winding sections 5a, 5b, 5c, 5d, 5e even if the conductor 5 is arranged in lap winding in each slot 3c, 3d, 3e, 3f, 3g. According to the constitution, rotational balance of an assembled rotor 1 can be improved resulting in suppression of motor noise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armature of a small motor used for a washer pump of an automobile, for example.

[0002]

2. Description of the Related Art An armature of a small motor used for a washer pump of an automobile is a thin plate-shaped fixed iron core provided with, for example, five conductor forming slots at a substantially central position of an armature shaft having a round bar shape. Are stacked and fixed, and a commutator having a number of commutator pieces corresponding to the number of slots is provided on a part of the armature shaft.

After connecting the end portion of the conductor to the first commutator piece of the commutator pieces, the first slot of the five slots and the second slot located next to the first slot.
Of the conductor is wound a predetermined number of times, and a part of the conductor is entangled from the second slot to the second commutator piece of the commutator pieces, and further, the first slot and the second slot are formed. Overlapping the wound conductor, winding the conductor from the second commutator piece to the second slot and the third slot adjacent to the second slot a predetermined number of times, and repeating this for each slot. The conductor was placed on the fixed core by lap winding.

[0004]

However, in the above-mentioned armature of a small motor, the conductors wound in the two adjacent slots are overlapped with the conductors and the conductors are repeatedly wound in each slot. Of the conductor wound around the slot and the weight of the conductor wound around the second slot and the conductor wound around the third slot are different from each other. And the weight of the conductor of the last wound slot part may be significantly different from each other, which may cause imbalance of rotation in the assembled armature. There was a problem that noise was generated when the motor was assembled.

[0005]

SUMMARY OF THE INVENTION The problem to be solved by the invention is that when the weight of the first wound conductor and the weight of the last wound conductor are significantly different, the assembled armature is rotated. This is a point that may cause imbalance in the motor and cause motor noise.

[0006]

[Constitution of the invention]

[0007]

The armature of a small-sized motor according to the present invention has a plurality of positions in order to prevent the generation of motor noise by preventing imbalance in rotation of the armature after assembly. An armature core having a slot formed therein, an armature shaft concentrically fixing the armature core, and a conductor provided with a winding portion formed by lap winding with respect to the slot of the armature core, It is characterized in that the ratio of the weight difference between the winding parts of the conductor is set within 5/100, and in a more preferred embodiment, the number of turns of the conductor is changed for each winding part. The object of the present invention is to provide an armature for a small motor with low motor noise by improving the balance of rotation of the armature that has been assembled.

[0008]

In the armature of the small-sized motor according to the present invention, the ratio of the weight difference between the winding portions of the conductors arranged by lap winding in the slot of the armature core is set within 5/100. Therefore, even if the conductors are arranged in the slots by overlapping winding, the weights in the respective slots are almost the same.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an armature for a small motor according to the present invention will be described below with reference to FIGS. In this embodiment, a 5-slot armature will be described.

In the illustrated armature 1, an armature core 3 is fixed to an armature shaft 2 having a round bar shape.

In the armature core 3, a plurality of thin plate-shaped core pieces 3a are stacked and fixed along the axial direction of the armature shaft 2, and an armature shaft hole 3b provided at the center is provided in the armature shaft 2. Are arranged concentrically.

Also, the armature shaft hole 3b of the armature core 3
The first slot 3c, the second slot 3d, and the third slot 3 radially protruding at equal intervals at five locations on the outer peripheral side of the
e, a fourth slot 3f and a fifth slot 3g are formed respectively.

The armature core 3 of the armature shaft 3b
Is provided near the commutator 4, and the slots 3c, 3d, 3e, 3f, 3 are provided on the outer peripheral side of the commutator 4.
5 commutator pieces 4a, 4b, 4c, 4 corresponding to g
d and 4e are formed, and these commutator pieces 4 are formed.
Conductor connecting portion 4a is provided on a part of a, 4b, 4c, 4d, 4e.
1, 4b1, 4c1, 4d1, 4e1 are provided.

Further, the commutator pieces 4a, 4b, 4 are also provided.
c, 4d, 4e conductor connecting portions 4a1, 4b1, 4c1,
4d1 and 4e1 and slots 3c, 3d, 3e and 3f,
A conductor 5, which is a copper wire, is wound around 3 g.

The conductor 5 has one end connected to the conductor connecting portion 4a1 of the first commutator piece 4a, and then the first slot 3c.
And the second slot 3d are wound multiple times to form the first winding portion 5a, and a part of the first winding portion 5a extends from the conductor connecting portion 4b1 of the second commutator piece 4b. It is connected by being stripped.

The conductor 5 entangled in the conductor connecting portion 4b1 of the second commutator piece 4b is wound around the second slot 3d and the third slot 3e a plurality of times to form the second winding portion 5b. Part of the second winding portion 5b is connected to the conductor connecting portion 4c1 of the third commutator piece 4c by tangling it, and the conductor 5 is further connected to the conductor connecting portion 4c1 of the third commutator piece 4c. Twisting → formation of the third winding portion 5c by winding around the third slot 3e and the fourth slot 3f → fourth commutator piece 4
Tangled to the conductor connection portion 4d1 of d → the fourth slot 3f
And formation of the fourth winding portion 5d by winding around the fifth slot 3g → barking of the fifth commutator piece 4e to the conductor connecting portion 4e1 → to the fifth slot 3g and the first slot 3c To form the fifth winding portion 5e by winding the wire → the commutator 4a, 4b, 4c, 4d, 4e and the winding portion 5a, 5b by tangling the first commutator piece 4a to the conductor connecting portion 4a1. ,
A closed circuit passing through 5c, 5d, and 5e is formed.

The first winding portion 5a has a first slot 3c and a second slot 3 in which no other winding portion is formed.
and the second winding portion 5b is wound around the first winding portion 5a.
A part of the second slot 3d is wound and the other winding part is wound around the third slot 3e not formed,
The third winding portion 5c is wound around the third slot 3e in which a part of the second winding portion 5b is wound and the fourth slot 3f in which another winding portion is not formed. 4 winding part 5d
Is wound around the fourth slot 3f in which a part of the third winding portion 5c is wound, and the fifth slot 3g in which another winding portion is not formed, and the fifth winding portion 5e. Is the first with the fourth slot 3g around which a part of the fourth winding portion 5d is wound.
The first slot 3c in which a part of the winding portion 5a of
The conductor 5 is wound around the first winding portion 5
a is set to 53 times, the second winding section 5b is set to 49 times, the third winding section 5c is set to 48 times, the fourth winding section 5d is set to 48 times, and the fifth winding section 5e is set to 47 times. I am doing it.

Thus, the winding diameter of the first winding portion 5a is determined by the winding diameter of the second winding portion 5b, the winding diameter of the third winding portion 5c, and the winding diameter of the fourth winding portion 5d. Despite being slightly smaller than the winding diameter of the fifth winding portion 5e, each winding portion 5a, 5b,
The length dimension of the conductor 5 for each of the 5c, 5d, and 5e is substantially the same, and the conductor 5 for each of the winding portions 5a, 5b, 5c, 5d, and 5e.
Since the lengths of the conductors are almost the same, the weight of the conductor 5 corresponding to one winding and the winding portions 5a, 5b, 5c, 5
The ratio of the weight difference between the winding parts 5a, 5b, 5c, 5d, and 5e obtained by multiplying the number of turns of the conductor 5 of d and 5e is 5 /.
It is set in the range of 100 to 0.

Therefore, each winding portion 5a, 5b, 5c, 5
Since the weight ratio of the conductor 5 for each of d and 5e is close to 1, the conductor 5 has each of the slots 3c, 3d, 3e, 3f, 3g.
Even if they are arranged by lap winding, the winding parts 5a, 5
There is no imbalance in weight for each of b, 5c, 5d, and 5e.

The winding parts 5a, 5b, 5c, 5
Since the lengths of the conductors 5 for d and e are substantially the same, the internal resistances are substantially the same.
Each commutator 4 connected to a, 5b, 5c, 5d, 5e
There is also no difference in the resistance values among a, 4b, 4c, 4d, and 4e.

[0021]

As described above, the armature of the small-sized motor according to the present invention has the structure in which the ratio of the weight difference between the winding portions of the conductor is set within 5/100.
The rotation balance of the armature after assembly is extremely good, which reduces the motor noise and eliminates the difference in resistance between the commutators, thus stabilizing the commutation action. This is an excellent effect.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of an armature of a small motor according to the present invention.

FIG. 2 is a side view of an armature of the small motor shown in FIG.

FIG. 3 is an external perspective view of the armature core of the small motor shown in FIG. 1 around the armature core.

[Explanation of symbols]

 1 Small motor armature 2 Armature shaft 3 Armature iron core 3c, 3d, 3e, 3f, 3g Slot 5 Conductor 5a, 5b, 5c, 5d, 5e Winding part

Claims (2)

[Claims] 1. An armature core having a plurality of slots formed therein, an armature shaft concentrically fixing the armature core, and a winding portion formed by lap winding around the slots of the armature core. An armature for a small motor, comprising: a conductor provided, wherein a ratio of a weight difference of each of the winding portions of the conductor is set within 5/100. 2. The armature for a small motor according to claim 1, wherein the number of turns of the conductor is set to a different value for each winding portion.