JP2708413B2 - Method of manufacturing rotating electric machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a rotating electric machine such as a motor or a generator having a pick-up winding, and more particularly, to a method for winding a winding over an adjacent slot. The present invention relates to a method for manufacturing a rotating electric machine suitable for inserting. [Prior Art] In a rotating electrical machine, a pick-up winding method is generally employed for a low-voltage motor whose operating voltage is 440 V or less. This is, as shown in FIG.
Then, one side 3a of the two straight portions of the winding 3 in which the conductor is wound a plurality of times is placed at the bottom of the slot 1 so that
3b is incorporated in the slot 1 through the inter-winding insulation 4 so as to be above the slot 1 over several slots. As a result, in one slot, windings having opposite straddling directions are inserted in an overlapping manner at the top and bottom. On the other hand, many rotary electric machines have a special design in which two straight portions of a winding are inserted into adjacent slots. Conventionally, even when such a winding is inserted into an adjacent slot, as shown in Japanese Utility Model Publication No. 29-15925, it is inserted in a slot as shown in FIG. The formula was taken. Here, a description will be given of a state in the slot when the coil is inserted into the slot so as to be overlapped above and below the winding. If two straight portions of the winding are inserted across several slots,
As shown in the figure, the angle θ between the slot center axis and the winding is 90 °.
Therefore, the space of the slot can be effectively utilized, and the winding can be inserted. On the other hand, when inserting two straight portions of the winding into the adjacent slots,
As shown in the figure, the angle θ between the slot center axis and the winding is 90 °.
Because it is much smaller, there is wasted space between the slot and the winding. For this reason, when windings having the same cross-sectional size are inserted into the same slot, and when several slots are straddled, the ratio of the cross-sectional area of the conductor and the insulating material to the cross-sectional area of the slot (hereinafter abbreviated as space factor) is 80. % Can be incorporated, but when inserting it into adjacent slots, it can be incorporated only up to about 65%. And it was a necessity to raise the space factor and reduce the size and weight. [Problems to be Solved by the Invention] In the above-mentioned prior art, when two straight portions of the winding are inserted into adjacent slots, the slots are alternately inserted one above the other in the slots. Angle θ between center axis and winding
Is considerably smaller than 90 °, so that when a winding is inserted into a slot, no consideration is given to the need for useless space, and there is a problem that the space factor cannot be raised. The present invention has been made in view of the above points, and an object of the present invention is to provide a method for manufacturing a rotating electric machine capable of reducing the size and weight of a rotating electric machine and improving insulation performance by setting a space factor to about 80%. To provide. [Means for solving the problems] In order to obtain a method of manufacturing a rotating electric machine that achieves the above object, the present invention inserts an insulator into a plurality of axial slots provided on the gap side of the iron core, A rotating electric machine in which a winding formed by winding a conductor a plurality of times is inserted across each adjacent slot of the plurality of slots, and windings having different straddling directions are inserted into each of the plurality of slots. In the manufacturing method, the different conductors with respect to the cross-sectional area of the slots by inserting the different windings in the straddling direction into the plurality of slots so that each of the plurality of slots is vertically divided into right and left by the different windings in the striding direction. The cross-sectional area ratio of the insulator is set to about 80%, and then the varnish is immersed. [Operation] In the present invention, since the windings having different straddling directions are inserted into the plurality of slots so that each of the plurality of slots is vertically divided into right and left by the windings having different straddling directions, the straight portion of the winding and the center of the slot are inserted. The angle θ made with the axis is almost 90 °,
No wasted space is formed between the slot and the winding,
Accordingly, the size of the slot can be reduced, and the ratio of the cross-sectional area of the conductor and the insulator to the cross-sectional area of the slot, that is, the space factor can be increased to about 80%. Further, in the present invention, the windings having different straddling directions are inserted into the plurality of slots so that each of the plurality of slots is vertically divided into left and right by the windings having different straddling directions, and the conductor and the insulator are cut off with respect to the cross-sectional area of the slots. Since the area ratio was set to about 80% and then the varnish was immersed, the varnish having a space factor of about 80% can be immersed. When the varnish is immersed in a space factor of about 80% as described above, the varnish sufficiently accumulates between the windings in the slot and in the gap between the ground insulation due to the capillary phenomenon, and the heating performed during the varnish immersion treatment is performed. Even when drying is performed, the outflow of the varnish from the gap between the windings and the ground insulation is suppressed, and the amount of the varnish remaining in the gap between the windings and the ground insulation can be increased, and the insulation performance can be improved. it can. As a result, the amount of varnish remaining in the gap between the windings and in the ground insulation increases, and the insulation performance is improved, so that the rare-earth breakdown voltage and the ground-to-earth breakdown voltage of the windings can be improved. In fact, the rare-earth breakdown voltage and the earth-to-earth breakdown voltage of the winding are improved by about 20% as compared with the conventional case. Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 in the case of a stator winding. As shown in FIG. 1 and FIG. 2, the conductor 5 has two polyamide enameled wires and has ten steps in the height direction and five rows in the width direction. A total of fifty turns were made so as to form a vertically long rectangle close to being divided into two parts, left and right, to form a stator winding 6. Here, the distance W between the two straight portions 6a and 6b of the stator winding 6 was set to be 2 mm larger than the distance L between adjacent slots. Next, two straight portions 6a and 6b of the stator winding 6 are made of aromatic polyamide paper 0.
Inserted into adjacent slot via 13mm. This was repeated by the number of slots, and the stator windings 6 were inserted into all slots. Next, as a cutting 7, an epoxy glass laminated board thickness of 1 mm
Was inserted. At this time, the space factor in the slot is 80.5%. Next, the stator 8 was formed by immersion treatment with a solventless polyester varnish as an impregnating varnish. As described above, according to the present embodiment, windings having different straddling directions are inserted into the plurality of slots such that each of the plurality of slots is vertically divided into left and right by windings having different straddling directions. The angle θ with the central axis is almost 90
°, no useless space is formed between the slot and the winding, the size of the slot can be reduced accordingly, the ratio of the cross-sectional area of the conductor and the insulator to the cross-sectional area of the slot,
That is, the space factor can be increased to 80.5%. Therefore, the size and weight of the device can be reduced. Further, according to the present embodiment, the average length of the windings can be made shorter than in a conventional system in which windings having different straddling directions are vertically stacked on a slot, so that losses generated in the windings can be reduced. Further, according to the present embodiment, the windings having different straddling directions are inserted into the plurality of slots so that each of the plurality of slots is vertically divided into left and right by the windings having different straddling directions. The cross-sectional area ratio of the object is 8
0.5%, and then varnish immersion treatment,
An immersion treatment can be applied to a material having a space factor of 80.5%. Thus, a space factor of 80.5
%, When the varnish is immersed in the varnish, the varnish sufficiently accumulates in the gap between the windings in the slot and in the ground insulation, due to the capillary phenomenon. Outflow of the varnish from the gap between the ground and the ground insulation is suppressed, the amount of the varnish remaining between the windings and the gap between the ground insulation can be increased, and the insulation performance can be improved. As a result, the amount of varnish remaining in the gap between the windings and in the ground insulation increases, and the insulation performance is improved, so that the rare-earth breakdown voltage and the ground-to-earth breakdown voltage of the windings can be improved. In fact, the rare-earth breakdown voltage and the earth-to-earth breakdown voltage of the winding are improved by about 20% as compared with the conventional case. In addition, it was found from the dismantling inspection results that the amount of varnish remaining between the windings and in the gap between the ground insulation was increased. In the present embodiment, the case where the present invention is applied to the stator of the rotating electric machine has been described, but the present invention is also applicable to the rotor. [Effects of the Invention] According to the present invention, the windings having different straddling directions are inserted into the plurality of slots such that each of the plurality of slots is vertically divided into right and left by the windings having different straddling directions. The angle θ between the slot and the central axis of the slot is approximately 90 °, so that no useless space is formed between the slot and the winding, the size of the slot can be reduced accordingly, and the conductor and insulation with respect to the cross-sectional area of the slot can be reduced. The ratio of the cross-sectional area of the object, ie
The space factor can be increased up to about 80%. Further, in the present invention, the windings having different straddling directions are inserted into the plurality of slots so that each of the plurality of slots is vertically divided into left and right by the windings having different straddling directions, and the conductor and the insulator are cut off with respect to the cross-sectional area of the slots. Since the area ratio was set to about 80% and then the varnish was immersed, the varnish having a space factor of about 80% can be immersed. When the varnish is immersed in a space factor of about 80% as described above, the varnish sufficiently accumulates between the windings in the slot and in the gap between the ground insulation due to the capillary phenomenon, and the heating performed during the varnish immersion treatment is performed. Even when drying is performed, the outflow of the varnish from the gap between the windings and the ground insulation is suppressed, and the amount of the varnish remaining in the gap between the windings and the ground insulation can be increased, and the insulation performance can be improved. it can. As a result, the amount of varnish remaining in the gap between the windings and in the ground insulation increases, and the insulation performance is improved, so that the rare-earth breakdown voltage and the ground-to-earth breakdown voltage of the windings can be improved. In fact, the rare-earth breakdown voltage and the earth-to-earth breakdown voltage of the winding are improved by about 20% as compared with the conventional case. Therefore, it is possible to provide a method of manufacturing a rotating electric machine that can reduce the size and weight of the rotating electric machine and improve insulation performance by setting the space factor to about 80%.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a perspective view of a winding of the present invention, and FIGS. 3 and 4 are sectional views showing a conventional rotating electric machine. It is. DESCRIPTION OF SYMBOLS 1 ... Slot, 2 ... Ground insulation, 3 ... Winding, 3a, 3b ... Linear part of winding, 4 ... Insulation between windings, 5 ... Conductor, 6 ... Stator winding, 6a, 6b ... Stator winding 7: cutting, 8: stator, L: distance between adjacent slots, W: distance between stator winding linear parts.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Kenzo Kajiwara               3-1-1, Sachimachi, Hitachi               Inside the Hitachi Factory (72) Inventor Masakatsu Akimoto               3-1-1, Sachimachi, Hitachi               Inside the Hitachi Factory                (56) References JP-A-60-121936 (JP, A)                 JP-A-59-162750 (JP, A)                 JP-A-59-122330 (JP, A)                 Showa 55-37511 (JP, U)                 Shokai Sho 59-145252 (JP, U)

Claims (1)

(57) [Claims] Insert the insulator into a plurality of axial slots provided on the gap side of the iron core, then insert a winding formed by winding a conductor a plurality of times over each adjacent slot of the plurality of slots, In the method for manufacturing a rotating electrical machine, wherein windings having different straddling directions are inserted into each of the plurality of slots, the crossing direction may be such that each of the plurality of slots is vertically divided left and right by the windings having different straddling directions. Different windings into the plurality of slots to determine the ratio of the cross-sectional area of the conductor and the insulator to the cross-sectional area of the slot.
A method for manufacturing a rotating electric machine, characterized in that a varnish immersion treatment is applied to about 80%, followed by immersion treatment.