JPH0744810B2 - Slotted armature - Google Patents

Description

TECHNICAL FIELD The present invention relates to a slot type armature used for a rotating electric machine such as a starter.

"Prior Art and its Problems" In the slotted armature 1, the iron core 4 and the commutator 5 having slots 3 formed at regular intervals in the shaft 2 are fixed by press fitting or knurling, and the start end and the end of the winding are connected. An engaging piece 6 for engaging and engaging is formed on the segment 7 of the square commutator 5 (FIG. 1). And
The iron core portion of the slot type armature is subjected to a primary insulation treatment for preventing insulation from the winding.

The slot-shaped armature 1 having the above-described structure, in which two or more layers are stacked and wound, is disclosed in Japanese Patent Publication No. 57-56301.

As the lap winding method, there are a so-called long alpha (hereinafter referred to as long α) winding method and a short alpha (hereinafter referred to as short α) winding method.

The alpha in the alpha winding method is derived from the fact that the winding is performed so as to draw the character "α".

Hereinafter, the long α winding method and the short α winding method will be described in a mode in which lap winding for four poles is performed on an armature having 12 slots and 12 commutator segments.

FIG. 2A is an explanatory diagram illustrating an example of the long α winding method.

For the sake of explanation, the slots 3 formed in the iron core 4 and the segments 7 of the commutator 5 are numbered as shown in FIG.

First, the segment number (abbreviated below) "7"
The winding 8 which is locked by engaging the start end with the locking piece 6 of No. 1 has a slot number (1) and a slot pitch of about 90 ° by a flyer winding machine (not shown). After being wound into the slot “4”, the segment “8” is locked by engaging the end of the winding wire 8 with the locking piece 6. At this time, the slot-shaped armature 1 is rotated about 360 ° in the same direction as the winding direction, and the winding wire 8 is wound around the shaft 2. Then, the locking piece 6 of the segment "8"
The sequel of the winding 8 which has been engaged and locked is unwound from the flyer winding machine, wound into the slots "2" and "5", and entangled and locked in the locking piece 6 of the segment "9". Similarly, the winding wire 8 is wound between the slots 3 at a predetermined slot pitch in the same manner, and the windings are overlapped.

Further, as another example of the long α winding method, the winding wire 8 is wound around the slot 3 by a predetermined slot pitch as described above, and the end portion of the winding wire 8 is diagonally separated by about 180 °. After engaging with the locking piece 6 of No. 7, the slot type armature 1 is rotated in the reverse direction and the shaft 2 is returned without being wound, and a winding wire is sequentially provided between the adjacent slots 3 and the slots 3 separated by a predetermined slot pitch. There is also a method of giving it.

Further, as another example of the long α winding method, the flyer winding machine may be rotated or reversely rotated instead of rotating or reversely rotating the slotted armature 1 as in each of the above methods.

On the other hand, the short α winding method is shown in the explanatory view of FIG. 2 (b).

First, the winding wire 9 which is locked to the locking piece 6 of the segment "1" by engaging the starting end thereof is wound into the slot "4" having a slot pitch of about 90 ° with the slot "1", and then the winding wire 9 of the segment "2". Engage the end of the locking piece 6 and lock it. At this time, the slot type armature 1 is 360 ° / segment number (= 1
2) = 30 ° Rotate in the same direction as the winding direction. continue,
The sequel of the winding wire 9 which is locked by being locked to the locking piece 6 of the segment "2" is unwound and wound into the slots "2" and "5" and locked by being locked to the locking piece 6 of the segment "3". To do. Thereafter, similarly, the winding wire 9 is sequentially wound between the slots 3 to perform the overlapping winding.

As described above, in the long α-winding method and the short α-winding method, the slot type armature 1 is rotated in the same direction as the winding direction so that the winding is wound around the shaft 2 or the predetermined winding is repeated. The difference is that, after the ends of the windings are entangled in the locking pieces 6 of the segments 7 that are separated by an angle, the slot type armature 1 is rotated in the reverse direction to perform lap winding. , While rotating the slot type armature 360 °, or while rotating it forward or backward for a predetermined angle (12 slots, 12 commutator segments 4 poles about 180 °, 6 poles about 120 °) To draw a line,
It has a drawback that the winding time is longer than that of the short α winding method. Further, when the winding wire is wound around the shaft 2 directly, it may be easily scratched, which may cause a layer short-circuit or a ground, and in the worst case, a vehicle fire may occur. For this reason, the long α-winding method as described above is not generally adopted for medium-sized motors such as starter motors, but is adopted for motors with low power consumption. In this case, the insulating treatment between the winding wire and the shaft 2 is performed by taping with an insulating tape or by attaching an insulating ring or spacer as shown in Japanese Utility Model Laid-Open No. 59-41061. Therefore, not only the third part is required, but also the man-hours are increased and the price is increased.

However, the short α-winding method adopted as a general lap winding method is, for example, as shown in FIG. 3A, in the case of the 4-pole slot type armature 1, the winding 9 is wound at a predetermined slot pitch. The slot 3'existing between the slot pitches is closed by the winding wire 9 which is wound along the side surface of the iron core 4 in the outer circumferential direction in an aligned manner. Therefore, when the winding 9 is applied to the slot 3, the winding 9'starts from the winding 9 which closes the slot, and the space in which the winding 9 is not applied is called a dead space. There is a disadvantage that the volume in the slot 3'cannot be used effectively due to the generation of 10. This drawback appears as shown in FIG. 3 (b) even when the lap winding is applied for two poles.

[Problems to be Solved by the Invention] However, in the long α winding method, a winding wire wound around a predetermined slot and engaged with a locking piece of a segment is wound around the shaft 2 and an angle at which the shaft 2 is contacted. To supply to the next slot 3,
After winding the winding on the locking piece 6 of the segment 7 separated by a predetermined angle, the winding is returned and supplied to the next slot 3. Therefore, the winding that closes the slot 3 is pushed down toward the center of the shaft, and the dead space 10 Can be reduced.

Further, when the winding in the long α winding method is wound around the shaft 2 or in contact with the shaft 2, insulation measures between the winding and the shaft 2 are performed on the iron core 4 of the slot type armature 1. This can be solved by subjecting the outer circumference of the shaft 2 to a primary insulation treatment with powder.

The present invention has been made by paying attention to the above points, and when two or more layers of coils are wound in a single slot of an armature core, the long α winding method and the short α winding method are combined, It is an object of the present invention to provide a slot type armature having a high winding density wound in a slot, and further, a slot type capable of ensuring insulation between a winding and a shaft when a long α winding method is adopted. It is intended to provide an armature.

"Means for Solving the Problem" As a specific means for achieving the above-mentioned object, in a slot type armature in which two or more winding layers are wound in one slot of an armature core by lap winding, at least the lowest layer A slot-type armature is provided in which lap winding is performed by a long alpha winding method, and lap winding of an upper layer other than the above is performed by a short alpha winding method, and lap winding is performed in one slot of an armature core. In a slot-type armature in which two or more layers are wound with, the primary insulation treatment with powder that is performed on the armature core portion is extended to be performed on the shaft outer periphery exposed between the armature core and the commutator, and at least The bottom layer is wrapped by the long alpha winding method, and the top layers other than the above are wrapped by the short alpha winding method. Slot-shaped armature is provided, wherein.

[Operation] According to the specific means, after at least the lowest layer of lap winding is applied to the slot-type armature by the long α winding method, the winding of the further upper layer lap winding is performed by the short α winding method. Is given.

And, the slot type armature subjected to the above-mentioned lap winding, the primary insulation treatment by the powder to be carried out on the armature core is carried out by extending to the shaft outer periphery exposed between the armature core and the commutator, Insulation is secured between the long α-type winding that is directly wound around or in contact with the shaft and the shaft.

"Examples" Examples of the present invention will be described below.

FIG. 4 is a front view of a part of the slotted armature 1,
It shows a mode in which the lower layer portion of the slot 3 is wound by a long α winding method and the upper layer portion thereof is wound by a short α winding method.

The winding 8 which is supplied between the predetermined slots 3 formed in the iron core 4 and is wound in a lapped manner closes the slots 3 ′ existing between the predetermined slots 3 to form a so-called dead space 10. However, in the case of the long α winding method, as described above, the angle at which the winding wire 8 ′ wound around the shaft 2 and connected to the locking piece 6 formed on the segment 7 of the commutator 5 is in contact with the shaft 2. Is supplied to the slot 3 ', or the winding 8'is engaged with the locking piece 6 of the segment 7 separated by a predetermined angle and then returned to be supplied to the next slot 3, so that the winding 8' The winding 8 that causes the dead space 10 is pushed down toward the center of the shaft 2 as shown by the arrow in FIG. For this reason, it is possible to perform overlapping winding on the bottom portion of the slot 3'close to the shaft 2, and the number of windings 8 that can be wound in the slot 3'increases.

As described above, lap winding of the lowermost layer or the upper layer where the influence of the dead space 10 occurs is performed by the long α winding method, and when the influence of the dead space 10 becomes small, the winding is switched to the short α winding method. Give.

Further, in order to reduce the diameter of the starter or the like, there is a technical demand for reducing the diameter of the armature 1 and maintaining the same output as that of the conventional one.

This request can be met by making the bottom of the slot 3 formed in the slotted armature 1 having a smaller diameter deeper toward the center of the shaft 2 and winding the same number of windings as in the conventional case. When the bottom of the slot 3 is deeply formed on the center side of the shaft 2 and winding is performed by a short α winding method, the end of the winding 9 is attached to the locking piece 6 provided in the segment 7 of the commutator 5 that is continuously provided. Since the winding 9 is difficult to enter the bottom of the slot 3, the dead space is a space where the winding 9 is not applied.
10 results.

Therefore, as described above, the dead space 10 can be eliminated by applying the winding 8 by the long α winding method in the vicinity of the bottom of the slot 3, and the number of the windings 8 applied to the slot 3 can be the same as the conventional one. It is possible to reduce the diameter of the starter motor or the like.

Incidentally, in the case of a slot type armature which is usually incorporated in a small-sized starter, the above-mentioned dead space can be reduced by adopting the long α winding method only for the lowermost winding.

After carrying out the winding by the short α winding method for the upper layer part, the winding wound on the locking piece of the commutator,
The wires are connected by fusing and a secondary insulation treatment is applied.

FIG. 5 is a cross-sectional view of the slot type armature 1 before winding, showing a portion subjected to the primary insulation treatment with powder. The portion subjected to the primary insulation treatment extends from the inside of the iron core 4 to the outer periphery of the shaft 2 exposed between the iron core 4 and the commutator 5, as shown by the symbol a, and near the inner end surface of the commutator 5. Up to. As described above, the slot-type armature 1 which has been subjected to the primary insulation treatment with the powder has the long α layer formed by overlapping the lowermost layer or the upper layer portion where the dead space 10 is affected.
When the winding method is used, the winding 8 is directly wound around or in contact with the shaft 2, but since the primary insulation treatment is applied to the outer circumference of the shaft 2 and extends to the vicinity of the inner end surface of the commutator 5, the winding is concerned. The insulation between the shaft 8 and the shaft 2 can be reliably maintained. Moreover, since taping is not performed and insulation is not secured by mounting a third component such as a spacer or a ring, it does not increase the cost and contributes sufficiently to the demand for a small diameter starter motor. can do.

Further, the slot type armature of the present embodiment, as described above,
By wrapping the winding for the lower layer with the long α winding method and the winding for the upper layer with the short α winding method, the joints of the winding to each segment of the commutator are long α winding method and short α winding method. It has a suitable winding density in combination with the method. Therefore, when a varnish or a resin is impregnated to improve heat resistance, temperature resistance, vibration resistance, etc., there is also a secondary effect that the adhesion amount of the resin or the like increases and the degree of bonding of the commutator portion becomes strong. .

[Advantages of the Invention] As has been made clear in the description of the specific means and actions, the present invention is characterized in that at least the lowermost layer is lap-wound by the long α winding method on the slot type armature, and then other than that. Since the upper layer lap winding is performed by the short α-winding method, the long α-winding method pushes down the winding that closes the lower part in the center direction of the slot to reduce the dead space and is wound in one slot. It is possible to provide a slotted armature capable of increasing the winding density by increasing the number of windings.

In the slot type armature that is subjected to the lap winding as described above, the primary insulation treatment with powder that is performed on the armature core is extended to the outer circumference of the shaft exposed between the armature core and the commutator. Therefore, the insulation between the long α-type winding that is directly wound around or in contact with the shaft and the shaft can be secured at a lower cost than the conventional insulation method in which taping, spacers, etc. are mounted, and the grounding is possible. It is possible to provide a slot-type armature with high reliability for the like.

[Brief description of drawings]

The attached drawings show an embodiment of the present invention. Fig. 1 is a perspective view of a slot type armature, Fig. 2 (a) is an explanatory view for explaining a long α winding method, and Fig. 2 (b) is a short α winding. FIG. 3 (a) is an explanatory view illustrating the method, FIG. 3 (a) is an explanatory view showing a dead space caused by winding in the case of four poles, and FIG. 3 (b).
Is an explanatory view showing a dead space caused by winding in the case of two poles, FIG. 4 is a front view of a part of a slot type armature to which the present invention is applied, and FIG. 5 is a view before winding. It is sectional drawing of a slot type armature. 1 ... slot type armature, 3 ... slot, 4 ... iron core, 8 ... long α winding type winding, 9 ... short α winding type winding, a ... primary insulation treatment part.

Claims (2)

[Claims] 1. An armature iron core comprising two slots wound in one slot.
In a slot-type armature in which windings of more than one layer are provided, at least the lowest layer is wound by a long alpha winding method, and the upper layers other than those described above are wound by a short alpha winding method. Child. 2. An armature iron core with two laps wound in one slot.
In slot-type armatures with more than one layer of winding, the primary insulation treatment with powder that is applied to the armature core is extended to the outer circumference of the shaft exposed between the armature core and commutator, and at least the lowest layer. The slot-type armature is characterized in that the lap winding is performed by the long alpha winding method, and the lap winding of the upper layer other than the above is performed by the short alpha winding method.