JP2536100Y2 - Winding structure of motor rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a winding structure of a motor rotor, and more particularly to a winding structure of a motor rotor having a characteristic in an end coil portion.

<Prior Art> Conventionally, a coil is wound around a core tooth so as to pass through a plurality of core teeth divided by a plurality of slots extending at a certain angle with respect to the axial direction and a pair of the slots. In the rotor of the motor, the outer end of the core teeth is formed with a free end portion that widens in the circumferential direction for the purpose of preventing the coil from coming off, but the coil is formed with a relatively large diameter wire in particular. In the case, at the corner on the side where the uppermost element wire of the coil enters the slot from the end coil portion, it swells in the direction of coming out of engagement with the core teeth due to restoring force or the like, and easily falls off the slot. This has been a major obstacle in the winding process of the coil of the motor rotor and in the management after the winding.

Japanese Patent Application Laid-Open No. 54-22502 discloses a structure in which, in an end coil portion of a coil wound around a core tooth, an axial length between an upper coil and a lower coil is unequal. Is disclosed. In such a structure, since the outermost end portions of the folded portions of the coil received in the same slot in the end coil portion do not overlap in the radial direction, the coil expands in the radial direction. And the wire of the coil is relatively easy to catch on the widened portion of the free end portion which widens in the circumferential direction of the outer periphery of the core teeth. The problem that it is difficult to engage with the widened portion of the free end portion of the core teeth at the side corner portion that enters the slot from the portion is not necessarily solved.

<Problems to be Solved by the Invention> In view of the problems of the related art, a main object of the present invention is to provide a motor capable of suitably preventing a coil from dropping out of a slot during and after winding. It is to provide a winding structure of a rotor.

<Means for Solving the Problems> According to the present invention, such an object is achieved by a plurality of core teeth divided by a plurality of core teeth extending at an angle with respect to the rotation axis. A slot is formed, and an armature wound around the core teeth so that approximately the same number of coils as the slots pass through a pair of slots among the slots, and coaxially mounted on the rotating shaft; A commutator fixed to the armature coaxially with the armature at a position axially spaced from the armature on the rotating shaft, and each of the core teeth is
In order to prevent the coil from coming out of the slot, a free end portion which widens in the circumferential direction so as to prevent the coil from coming off from the slot is formed on the outer peripheral side so that a wire of the coil is connected to the commutator from one of the pair of slots. A motor rotor that is wound so as to protrude into the other slot through an outermost folded portion that projects to the opposite end face side and is folded to the other slot side different from the one slot of the pair of slots. Wherein the outermost end folded portion of at least the uppermost element wire is formed closer to the one slot than the other slot, and the one slot of each coil is formed. A portion of the other coil that protrudes into the other slot overlaps with a portion of the other coil that protrudes from the other slot, thereby providing a winding structure of the motor rotor. It is achieved.

<Operation> In this way, since the coil wire enters the slot at the entry side at an acute angle at the position where the coil enters the slot from the end coil portion, it becomes easy to catch on the widening portion of the widening free end of the core tooth. , Is reliably received in the slot.
Here, even if an obtuse angle is formed from the protruding slot toward the protruding end, there is no concern that the coil will fall off during winding because it is regulated by the protruding slot.

<Embodiment> Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a rotor portion of a motor to which the present invention is applied. The rotary shaft 1 is provided with a sleeve (not shown) made of an insulator, and an armature 2 and a commutator 4 are fixed on the outer periphery of the rotary shaft 1 so as to be spaced apart from each other in the axial direction and coaxial with each other. The armature 2 has a core 3 formed by laminating a large number of thin plates, and extends substantially in the axial direction.
It has 21 core teeth 6 divided along the circumferential direction by the slots 5 of the book. An epoxy coating is formed on the surface of the core 3. Here, the slots 5 and the core teeth 6 are formed so as to make an angle with respect to the axial direction, and the slots and the core teeth are parallel to each other. The armature 2 has a plurality of coils 7 wound around the core teeth 6 so as to pass through a pair of the slots 5.
The commutator 4 has 21 segments 8 divided so as to be insulated from each other along the circumferential direction, and 21 engagement holes formed in a large-diameter portion 9 formed at the end on the armature 2 side. And a groove 9a. The lead wires 10 of the coil 7 are connected to these engaging grooves 9a, and are fixed to each other by electrodeposition or the like.

FIG. 2 is a diagram showing the winding structure of the motor rotor according to the present invention. This winding is performed by a winding method called a so-called wave winding. First, not shown
The starting ends of the 21 coil wires derived simultaneously from the 21 nozzles are connected to the segments 15 to 35. Then, the coil wire is extended obliquely to the right in FIG. 2 with respect to the axial direction, pierces the slots 57 to 77, and passes through the slots as the coils 36 to 56. To the end coil part on the opposite side. When the nozzle is located at the end coil portion, a sleeve (not shown) is fitted to the armature 2 from the commutator side, and the coil 36
The outermost end folded portion 7a is formed by folding the outermost end of the sleeve from the inside to the outside. Then, the sleeve is disengaged from the armature 2, the armature 2 is indexed, and the coils 36 to 56 are inserted from the above-mentioned entry slot into a slot which is five places to the right in FIG. Here, when the coil is passed through this slot, each coil element wire is pressed inward in the axial direction of the rotating shaft 1 by a jig at the end of the coil entry side slot of the end coil portion, and is fixed. Each coil is positioned and the shape of each coil in the end coil portion is not damaged.

Next, at the commutator 4 end coil portion, a sleeve is fitted to the armature 2 from the side opposite to the segment 8 in the same procedure as described above to form an outermost folded portion. It is inserted into the slot five spaces to the left in FIG.

A segment which is separated by 10 turns to the right in FIG. 2 from the first extended segment after winding three turns between the slots which are separated from each other by five, that is, five core teeth 78 to 98 respectively. To be connected.

Here, the above-described process is performed by, for example, the coil 36 and the coil 41.
Focusing on the description, from the segment 15 to the lead wire 36a
At the same time, the lead wire 41a extends from the segment 20, which is five distances from the segment 15 rightward in FIG.

The lead wire 36a is used as the coil 36 in the slots 57 and 6
Between the two, that is, between core teeth 78-82, three turns,
At the same time, the lead wire 41a is wound three turns between the slots 62 and 67, that is, between the core teeth 83 to 87, as the coil 41. That is, as shown in FIG. 3 which is a partially enlarged sectional view of FIG. 1 viewed from the axial direction, three strands of the coils 36 and 41 are alternately provided in the slot 62 for a total of 6 wires. In this case, the space factor of the coil in the slot is improved as compared with a structure in which one element wire is received and one or two turns are wound using a coil having a larger wire diameter than the coil used in the present embodiment. doing.

Here, at the outer peripheral portion of the core teeth 78 to 82, a free end portion 11 which is wider in the circumferential direction than the inner peripheral side is formed, that is, the core teeth 78 to 82 have a T-shaped cross section. The coil in each slot is prevented from coming off by the circumferentially widened portion 11a. Coil wound three turns between core teeth 78-82
The coil 36 is engaged with the segment 25 which is ten positions to the right in FIG.
Is engaged. Segment 15 has segment 26
Is wound around the core teeth in the same manner as the coil 36, and is engaged with the upper layer of the lead wire 36a as a lead wire 47b.

According to this embodiment, as shown in FIG. 1 and FIG. 4 showing only three strands of a coil wound between the same slots, the end opposite to the commutator 4 is used. In the coil part, the wire 12 of the first round and the wire 13 of the second round
Extends approximately a predetermined length from the protruding slot 5 in the axial direction of the rotor 1 and is bent toward the outermost folded portions 12a and 13a. Portions toward the outermost folded portions 12a, 13a and 14a are parallel to each other. Therefore, the coils adjacent to each other or the wires 12 to 14 do not unnecessarily cross each other at the end coil portion, and the radial expansion of the end coil portion is prevented.

As shown in FIG. 5, which is a partially enlarged view of FIG. 1, for example, focusing on the coil 36 wound between the pair of slots 57 and 62, the end opposite to the commutator 4 In the coil part, the uppermost element wire 36c of the coil 7
However, the outermost end folded portion 36d that protrudes from one slot 57 and is folded toward the other slot 62 is formed closer to the corner 57a on the slot 57 side than the corner 62a on the slot 62 side. For this reason, the outermost end of the coil is bent at a sharper angle at the corner on the entry side, as compared with a type in which the outermost end folded portion is formed at an intermediate position between 6b and the corner 6a as shown in FIG. The extended free end 11 of the core teeth
, And is easily engaged with the circumferentially widened portion 11a. At this time, at the corner 57a on the side where the coil 36 projects from the slot 57 to the end coil portion, even if the bending angle of the wire 36c is relatively gentle, another coil overlaps the upper layer side, There is no fear that the coil will fall off from the corner 57a. Here, the coils shown in FIGS. 5 and 6 show only relatively outer coils for the sake of explanation, and the arrows indicate the winding direction of the coils.

The core teeth 6 are provided at an angle with respect to the axial direction of the rotating shaft 1. For example, as shown by an arrow in FIG. The angle β formed between the end face and the side surface in the slot 57 projects through the corner portion 57a forming an obtuse angle to the end coil portion as the outer end, and the angle α formed between the axial end surface of the core tooth 82 and the side surface in the slot 62 Project into the slot 62 through a sharp corner 62a. For this reason, as shown by the arrow in FIG. 6, the coil 7 is formed at a corner where the angle α between the axial end face of the core tooth 6 and the side surface in the slot 5 forms an acute angle from a certain slot 5 to the end coil portion. A winding structure protruding through a portion 6a and entering the other slot 5 through a corner 6b at which an angle β between an axial end face and a side surface in another slot 5 different from the slot forms an obtuse angle. In comparison with the above, the coil 7 is bent at a relatively sharp angle at the corner on the side of entry from the end coil portion to the slot, and is easily engaged with the circumferentially widened portion 11a of the free end portion 11 of the core tooth as described above. Has become.

As shown in FIG. 4, in the end coil portion of the coil 7 opposite to the commutator 4, the lowermost (first round) wire 12 of the coil wound three times is wound. The length in the axial direction is the longest, and the wire 14 in the uppermost layer (third round) is the shortest. Therefore, the wire 14 in the third round is bent at a sharper angle at the entry side corner than in the case where the length in the axial direction is longer than the other wires 12 or 13. Into the slot 5 to easily engage with the free end 11 as described above. From the above, the engagement between the coil 7 and the core teeth 6 is ensured.

<Effects of the Invention> As described above, according to the present invention, the opposite end coil portion of the motor rotor of the type having the circumferentially widened free end portion that prevents the coil from coming off in the core teeth is used. By simply forming the outermost end of the coil as a folded portion closer to the slot on the projecting side of the coil than the slot on the projecting side of the coil, it is possible to reliably receive and hold the coil in the slot. Therefore, the complexity in the winding process of the motor rotor is eliminated. Also, after winding, the side protruding into the coil slot is securely hooked to the circumferentially widened portion of the widening free end of the core tooth, and the side protruding from the coil slot is connected to another slot from the upper layer. Since the coil is pressed down by the intruding side coil, there is no need to worry about the coil dropping out of the slot, and the reliability is improved as a whole.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a motor rotor to which the present invention is applied. FIG. 2 is a development diagram showing a winding structure according to the present invention. FIG. 3 is a partially enlarged sectional view of FIG. 1 viewed from the axial direction. FIG. 4 is an explanatory diagram schematically showing an enlarged part of an end coil portion on the side opposite to the commutator of FIG. FIG. 5 is a developed enlarged view of FIG. 1 as viewed from the front. FIG. 6 is a view corresponding to FIG. 5 showing a conventional winding structure. 1 ... rotating shaft 2 ... armature 3 ... core 4 ... commutator 5 ... slot 6, 6 ... core teeth 6a, 6b ... corner, 7 ... coil 7a, 7b ... outermost end , 8 ... segment 9 ... enlarged diameter part, 9a ... engagement groove 10 ... lead wire, 11 ... free end part 11a ... widened part, 12-14 ... strand 12a, 13a, 14a, 14b ...... Outermost end turn-up part 15-35 Segment 36-56 Coil 36a, 36b, 41a, 47b Lead wire 36c Element wire, 36d Outermost end 57-77 Slot 78-98 …… Core teeth

Claims (1)

(57) [Scope of request for utility model registration] A plurality of slots divided by a plurality of core teeth extending at a certain angle with respect to the rotation axis and an axial direction are formed, and substantially the same number of coils as said slots are provided in each of said slots. An armature wound around the core teeth so as to pass through a pair of the slots and coaxially mounted on the rotating shaft, and axially spaced from the armature on the rotating shaft And a commutator fixed coaxially with the armature at a position. The core teeth have a T-shaped cross section. Having an end, wherein the wire of the coil is
It protrudes from one of the pair of slots toward the end face opposite to the commutator, and enters the other slot via an outermost folded portion that is folded back to the other slot side different from the one slot of the pair of slots. A winding structure of the motor rotor wound so that at least the outermost folded portion of the element wire on the uppermost layer side is formed closer to the one slot than the other slot. And a portion of the other coil protruding from the one slot and a portion of the other coil protruding into the other slot overlap with each other. .