JPH0646854B2 - Amachiyua - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an armature (armature), and more particularly to an armature of a DC motor in a starter device used for starting an engine, for example.

(Prior Art) Conventionally, an armature of a DC motor incorporated in a starter device has a large number of slots 1 for holding a coil which are formed at equal intervals around the circumference and extend radially inward as shown in FIG. A core body formed by laminating a plurality of disk-shaped core sheets 2 each having a plurality of slots. Slots 5 having the same width as the slots 1 of the core sheet 2 and the same width up to the outer peripheral portion are provided at both axial ends of the core body. Disk-shaped insulating plate 6 (6th
(Figure) is arranged. Many core sheets 2 and insulating plates 6
A plurality of coils 7 are inserted into the groove-shaped portion formed by the set of the slots 1 and 5 in the above, and the coils 7 project from both sides of the upper portion of each slot 1 of the core sheet 2 so as to half-close the opening of the slot 1. The protrusion 3 prevents the protrusion from the groove.

The manufacturing process of such a conventional amateur will be described. Each core sheet 2 is laminated as shown in FIG. 5 to form a core sheet laminated body in a state before the coil 7 is wound around the groove portion. The protrusions 3 for preventing the coil 7 from jumping out are formed so as to oppose from both sides of the upper portion of each slot 1 and project obliquely upward like a corner to open the opening of the slot 1. The base portion is formed with a concave V-shaped recess 4 as an escape when the slot 1 is finally bent to close the slot 1. After laminating a plurality of such core sheets 2, insulating plates 6 are arranged at both ends in the axial direction, and then an insulating paper 8 is provided on the outer periphery of the core body composed of the core sheet laminated body and the insulating plates 6 at both ends thereof. As shown in FIG. 3, the tape is also wound while being laid inside the groove. After that, a plurality of coils 7 are arranged in the groove portion of the core body, the protrusion 3 is pressed and bent to close the opening of the slot 1, and then the outer peripheral surface of the core sheet laminate is slightly cut and the outer peripheral surface is cut. The insulating paper 8 wound around is removed.

In the conventional amateur as described above, the insulating plates 6 provided at both ends in the axial direction of the core sheet laminate have metallic bent portions when the coils 7 extending from each slot 1 of the core sheet laminate are bent. Although it is intended to prevent the core sheet 2 from directly touching it, it is considered that a diameter smaller than the core sheet 2 is sufficient from the viewpoint of its application, and the one as shown in FIG. 6 was used. .

(Problems to be Solved by the Invention) However, the conventional amateur as described above has the following problems. That is, a large number of core sheets 2 as shown in FIG. 4 are laminated to form a core sheet laminated body, whereby the coil 7 is wound around the groove portion formed by the slots 1 being aligned in the axial direction. When bent at the end of the laminated body, the uppermost (radially outermost) coil 7 is caught mainly in the recess 4 formed in the base of the protrusion 3,
It was sometimes displaced toward the outer peripheral side from the normal position and floated up, and could not be held in place. If the protrusion 3 is bent and the slot 1 is closed in this state, the floating coil 7 is pressed by the protrusion 3 in an abnormal contact state, and as a result, the insulation of the coil 7 is broken and the coil 7 is made of metal. It was said that it would be grounded to the core sheet 2 of.

The object of the present invention is to solve the above-mentioned conventional problems, and when the coil is wound around the groove portion of the core sheet laminate, in particular, the uppermost coil is prevented from being lifted, and the fixed position is maintained. An object of the present invention is to provide an armature which is held in place and does not generate ground to the core sheet due to abnormal contact with the protrusion for pressing the coil.

(Means for Solving the Problems) An amateur of the present invention is provided with a plurality of slots provided at intervals in the periphery and extending inward in the radial direction, and protruding in the radial direction from the vicinity of the openings of each slot in the outer peripheral portion. A plurality of disk-shaped core sheets each having a pair of angular portions provided for each slot and concave portions formed on both sides in the vicinity of the opening of each slot so as to face each other. A plurality of coils are accommodated in the accommodating groove formed by stacking as described above, and the angular portion is bent inward in the circumferential direction of the opening of the slot to protrude inside the opening of the slot and to fill the recess. In an amateur provided with a core sheet laminate having a protrusion formed in this way, and a disk-shaped insulating plate provided at both axial ends of the core sheet laminate,
The disk-shaped insulating plate is provided with an insulating plate slot formed corresponding to the slot of the core sheet and having substantially the same width dimension as the slot, into which the coil is inserted, and the diameter of the disk-shaped insulating plate covers the concave portion. It has various dimensions.

(Operation) According to the amateur of the present invention, since the insulating plates arranged at both ends of the core sheet laminate cover the recesses in the slots of the core sheet, the uppermost coil is given a holding force by the slots of the insulating plate. The rise does not occur. Therefore, the uppermost coil is held in place, and even if the coil pressing protrusion is bent to close the slot opening, grounding is not generated due to abnormal contact with the uppermost coil. Does not happen.

(Example) Hereinafter, the amateur of the present invention will be described in more detail with reference to the preferred embodiments shown in the accompanying drawings.

FIG. 1 partially shows an amateur 10 according to an embodiment of the present invention. The amateur 10 of this embodiment includes a core sheet laminate 11 formed by laminating a large number of core sheets 2 similar to the conventional one shown in FIG. Disc-shaped insulating plates 12 made of a material such as a fiber sheet are arranged at both ends of the core sheet laminated body 11. Each insulating plate 12 has substantially the same diameter as or slightly smaller than the core sheet 2 so as to cover the recess 4 of the core sheet 2, and has the same width as the slot 1 of the core sheet 2 and the corresponding width dimension up to the outer peripheral portion. It has 12a.

Each slot 1 of the core sheet 2 and the core sheet laminated body 11
The insulating paper 8 is arranged along the inner surface of the groove portion in the axial direction formed by the alignment with the slots 12a of the insulating plate 12 arranged at both ends of the four coils 7 inside. The slots are aligned in the longitudinal direction. The upper end of the insulating paper 8 is shown in FIG.
As shown in FIG. 3, the protrusions 3 on both sides of the upper portion of the slot 1 of each core sheet 2 are in close contact with each other as if they were aligned, and as a result, the entire inner surface of the groove portion is covered with the insulating paper 8. On the other hand, looking at the insulating plates 12 arranged at both ends of the core sheet laminated body, the upper end of the insulating paper 8 is somewhat widened as shown in FIG. 2 (b). The gap in the upper part of the slot 12a is filled with the varnish 13 so that the upper end of the insulating paper 8 is fixed and the slot 1
The opening of 2a is closed.

When manufacturing the amateur 10 having such a structure, a plurality of core sheets 2 shown in FIG. 5 are laminated in the same manner as in the conventional case to form a core sheet laminated body. An insulating plate 12 having a small diameter is arranged on the core to form a core body. At this time, since the insulating plate 12 has a diameter slightly smaller than or substantially the same as that of the core sheet 2 as shown in FIG. The recessed portion 4 formed at the base of the protruding portion 3 exposed at the outermost end of is completely hidden, and thus is formed by a large number of the slots 1 of the core sheet 2 and the slots 12a of the insulating plate 12. Both ends of the groove portion of the core body to be formed are shaped by the slots 12a of the insulating plate 12.

Next, the insulating paper 8 is wound around the outer periphery of the core body while being laid in the groove portion as shown in FIG. Then, the plurality of coils 7 are wound around the groove portion of the core body. Each coil 7 extending from the groove portion is bent, but since the outermost end of the groove portion is formed by the slot 12a of the insulating plate 12, at least in this portion, the coil 7 is tightly fitted in the slot 12a. Since the coil 7 is fitted and held, even if the coil 7 is bent, the uppermost coil 7 is not lifted. Then, the protrusion 3 is pushed and bent inward of the slot, and each opening of the slot 1 is closed so as to sandwich the insulating paper 8. At this time, as described above, since the uppermost coil 7 in the groove is held at the predetermined position by the slot 12a of the insulating plate 12, it is not damaged by abnormal contact when the protrusion 3 is bent. After that, the slot 12a opening of the insulating plate 12 is filled with the varnish 13, the outer peripheral surface of the core sheet laminate is slightly cut, and the insulating paper 8 remaining on the outer peripheral surface is removed. The amateur 10 as shown in the figure is completed.

According to such an amateur 10, the coil 7 arranged in the groove portion at the time of its manufacture is held at a fixed position by the slots 12a formed by the insulating plates 12 at both ends, so that a dead ground due to an abnormal contact during bending of the protrusion 3 is prevented. In addition, since the opening in the slot 12a of the insulating plate 12 is filled with the varnish 13 to fix the insulating paper 8, the paper is prevented from being burnt during cutting.

(Effects of the Invention) As described above, according to the armature of the present invention, it is constituted by the core sheet laminated body formed by laminating a large number of core sheets at the time of manufacturing and the insulating plates arranged at both ends thereof. When arranging the coil in the groove of the core body, the insulating plate covers the recess formed near the opening of the slot of the core sheet, so even if the coil is bent it gets caught in the recess and shifts to the outer peripheral side from the normal position. As a result, when the coil is pushed down by pushing down the protrusion, abnormal contact does not occur with the uppermost coil, and an amateur without the risk of dielectric breakdown is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view partially showing an amateur according to an embodiment of the present invention, and FIG. 2 (a) is a fragmentary view of the core sheet of the amateur shown in FIG. Front view, FIG. 2 (b) is a fragmentary front view of a slot in which a coil is inserted through the insulating plate of the amateur shown in FIG. 1, and FIG. 3 is a process of manufacturing the amateur shown in FIG. 4 is a fragmentary front view showing the state in one step, FIG. 4 is a front view showing a core sheet constituting an armature, FIG. 5 is a front view showing a core sheet before winding a coil around a slot, and FIG. It is a fragmentary front view which shows the conventional amateur in the state in one process in the manufacturing process. 1 ... Slot, 2 ... Core sheet, 3 ... Protrusion, 4 ... Recess, 7 ... Coil, 8 ... Insulating paper, 10 ... Amateur, 11
... core sheet laminate, 12 ... insulating plate, 12a ... slot, 13 ... varnish. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A plurality of slots provided at intervals on an outer peripheral portion and extending inward in a radial direction, and a plurality of slots radially extending from the vicinity of an opening of each slot of the outer peripheral portion, and provided for each slot. A plurality of disc-shaped core sheets having a pair of angular portions and concave portions formed on both sides in the vicinity of the opening of each slot so as to face each other are laminated so that the slots are axially aligned. A plurality of coils are accommodated in the formed accommodation groove, the angular portion is bent inward in the circumferential direction of the opening portion of the slot so as to protrude inside the opening portion of the slot and to fill the concave portion. In an armature comprising a core sheet laminate having formed protrusions, and disc-shaped insulating plates provided at both ends in the axial direction of the core sheet laminated body, An insulating plate slot formed corresponding to the slot and having substantially the same width dimension as the slot and into which the coil is inserted is provided, and the diameter of the disc-shaped insulating plate is dimensioned to cover the recess. Featured amateurs.