JP2006149103A - Three-phase motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-phase motor having a stator that makes it possible to enhance varnish's ability of dropping and impregnating into a coil end portion in a phase-V winding coil. <P>SOLUTION: The three-phase motor has the stator 1 formed by inserting winding coils 3U, 3V and 3W in three phases, phase U, phase V, and phase W, into slots 21U, 21V, and 21W in a stator core 2. A first phase-to-phase insulating sheet 4A is placed between the phase-U coil end portions 32U and the phase-V coil end portions 32V. A second phase-to-phase insulating sheet 4B is placed between the phase-V coil end portions 32V and the phase-W coil end portions 32W. Each of the phase-to-phase insulating sheets 4A and 4B has a pair of insulating portions 41 that cover the respective coil end portions 32 and a coupling portion 42 that couples together a pair of the insulating portions 41 and is inserted into a slot 21 in the stator core 2. The coupling portions 42 of the individual phase-to-phase insulating sheets 4A and 4B are inserted into slots 21W for phase W. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a three-phase motor having a stator in which three-phase winding coils are inserted and disposed in slots provided on the inner peripheral surface of a stator core.

  As shown in FIGS. 17 to 19, the stator 9 used in the three-phase motor has winding coils 93 for each phase of the U phase, the V phase, and the W phase in a large number of slots 21 formed on the inner peripheral surface of the stator core 2. Is formed by sequentially inserting and arranging. The winding coil 93 for each phase is a distributed winding type in which an electric wire bundled with insulated wires is wound a plurality of times, and the winding coils 93 for each phase are distributed and arranged in a number of slots 21. The stator 9 is known.

  In the distributed winding type stator 9, the V-phase winding coil 93 </ b> V is predetermined with respect to the U-phase winding coil 93 </ b> U, and the W-phase winding coil 93 </ b> W is The slots are offset in the circumferential direction by the number of slots and inserted into the slots 21 of the stator core 2. The remaining portions of the winding coils 93 of the respective phases that are not inserted and arranged in the slots 21 protrude from the axial end portions 22 of the stator core 2 to form coil end portions 932 of the respective phases. FIG. 18 shows a state before the W-phase winding coil 93W is inserted and disposed.

Also, in order to reliably insulate the coil end portions 932 of each phase, between the U phase coil end portion 932U and the V phase coil end portion 932V, and between the V phase coil end portion 932V and the W phase An interphase insulating sheet 94 is disposed between the coil end portion 932W.
For example, as disclosed in Patent Document 1, an interphase insulating sheet 94 (interphase paper for motor interphase insulation), a pair of insulating portions 941 (plane portions) that respectively cover the coil end portions 932, and the pair of The insulating portions 941 are connected to each other, and are formed from a plurality of connecting portions 942 (leg portions) inserted and disposed in the slot 21. Then, the interphase insulating sheet 94 is prevented from being displaced in the axial direction and the circumferential direction of the stator core 2 by disposing each connecting portion 942 in the slot 21 and disposing the interphase insulating sheet 94. Can do.

  The connecting portion 942 of the first inter-phase insulating sheet 94A that insulates between the U-phase coil end portion 932U and the V-phase coil end portion 932V is inserted into the V-phase winding coil 93V. The connecting portion 942 of the second interphase insulating sheet 94B, which is inserted into the slot 21V (see FIG. 17) and insulates between the V-phase coil end portion 932V and the W-phase coil end portion 932W, The winding coil 93W is inserted into the W-phase slot 21W (see FIG. 18).

  By the way, as shown in FIG. 19, in the stator 9, in order to ensure the insulation of the winding coil 93 of each phase and to fix the position of the winding coil 93 of each phase, the stator 9 is inserted into the stator core 2. The varnish is dropped and impregnated into the coil end portion 932 of the winding coil 93 of each phase. Varnish is dripped onto the U-phase coil end portion 932U from the outer periphery side of the stator core 2, and varnish is applied to the V-phase coil end portion 932V and the W-phase coil end portion 932W from the inner periphery side of the stator core 2. It is dripping.

  However, as shown in FIG. 19, the V-phase coil end portion 932V is sandwiched between the U-phase coil end portion 932U and the W-phase coil end portion 932W. Therefore, varnish can be dropped only on the rising portion 933 formed by the V-phase coil end portion 932V rising from the axial end portion 22 of the stator core 2 with respect to the V-phase coil end portion 932V. Nevertheless, in the conventional stator 9, the outer peripheral side of the rising portion 933 in the V-phase coil end portion 932 </ b> V is covered with the connecting portion 942 of the interphase insulating sheet 94. Therefore, varnish can be dropped only from a part on the inner peripheral side to the V-phase coil end portion 932V, and it has been difficult to improve the dripping impregnation property.

JP 2004-166476 A

  The present invention has been made in view of such conventional problems, and an attempt is made to provide a three-phase motor having a stator capable of improving the drop impregnation property of varnish to a coil end portion in a V-phase winding coil. To do.

The present invention relates to a three-phase motor having a stator in which U-phase, V-phase, and W-phase three-phase winding coils are inserted into slots provided on the inner peripheral surface of the stator core.
The winding coil of each phase is formed by winding a wire a plurality of times, and includes a pair of insertion sides inserted into the slot and a pair of coil end portions connecting the pair of insertion sides. Become
Between the pair of coil end portions in the U-phase winding coil and the pair of coil end portions in the V-phase winding coil, a first interphase insulating sheet is provided to insulate them. A second inter-phase insulating sheet for performing insulation between the pair of coil end portions in the V-phase winding coil and the pair of coil end portions in the W-phase winding coil. Arranged,
The first interphase insulating sheet and the second interphase insulating sheet include a pair of insulating portions that respectively cover the coil end portions, a connecting portion that connects the pair of insulating portions, and is inserted into the slot. Have
Each of the connecting portions in the first interphase insulating sheet and the second interphase insulating sheet is inserted and disposed in a slot in which a pair of insertion side portions in the W-phase winding coil is inserted and disposed. The characteristic three-phase motor is (Claim 1).

The stator in the three-phase motor of the present invention is devised in the shape of the interphase insulating sheet to prevent the positional displacement of the interphase insulating sheet and to the coil end portion of the V-phase winding coil that is difficult to impregnate with varnish. This is an improvement in dripping and impregnating properties of varnish.
In other words, the first interphase insulating sheet and the second interphase insulating sheet of the present invention connect a pair of insulating portions that respectively cover the coil end portions and the pair of insulating portions, and are inserted into the slots of the stator core. And a connecting portion.
And each phase insulation sheet inserts and arranges each connecting portion in a slot of the stator core and arranges it in the stator core, thereby preventing displacement of the stator core in the axial direction and the circumferential direction.

  Further, in the present invention, the interphase insulating sheets of the first interphase insulating sheet and the second interphase insulating sheet are connected to each other by a pair of insertion sides of the W-phase winding coil. Inserted into the slot provided. Therefore, in the rising portion where the coil end portion of each phase winding coil rises from the axial end portion of the stator core, the rising portion of the W phase coil end portion is covered by the connecting portion of each interphase insulating sheet, The rising portion of the V-phase coil end portion is not covered by the connecting portion of the interphase insulating sheet.

When the varnish is dripped and impregnated into the winding coil of each phase inserted and disposed in the stator core, the varnish is dropped from the outer peripheral side of the stator core to the U-phase coil end portion, and the V-phase coil end portion is applied to the V-phase coil end portion. The varnish can be dropped from the inner peripheral side and the outer peripheral side of the stator core, and the varnish can be dropped from the inner peripheral side of the stator core onto the W-phase coil end portion. At this time, the varnish can be directly dropped onto the rising portion from the outer peripheral side of the stator core to the V-phase coil end portion, and the dripping impregnation of the varnish can be improved. Also, the U-phase and W-phase coil end portions can be directly impregnated with varnish and impregnated with these varnishes, as in the prior art.
Therefore, according to the stator in the three-phase motor of the present invention, it is possible to improve the drop impregnation property of the varnish to the coil end portion in the V-phase winding coil.

A preferred embodiment of the present invention described above will be described.
In the present invention, the three-phase motor can be used for various applications, for example, as a motor generator in an electric vehicle or a hybrid car.
Moreover, each said interphase insulating sheet can be comprised from the various sheet-like material which has electrical insulation. For example, each interphase insulating sheet can be a three-layer composite sheet in which two heat-resistant sheets made of polyamide resin are joined together with an adhesive.

The U-phase winding coil has a pair of insertion sides inserted into the slot and a pair of coil end portions protruding from the axial end of the stator core. The V-phase winding coil has a pair of insertion sides offset from the U-phase winding coil by a predetermined number of slots toward one side in the circumferential direction of the stator core. And a part of the pair of coil end portions is disposed so as to overlap the inner peripheral side of the pair of coil end portions in the U-phase winding coil. The pair of insertion sides are inserted and disposed in the slots with a predetermined number of slots offset from the V-phase winding coil toward one side in the circumferential direction of the stator core. Coil D Some of de section, it is preferably disposed to overlap the inner peripheral side of the pair of coil end portions of the winding coil of the V phase (claim 2).
As described above, the stator of the three-phase motor is formed by overlapping the U-phase, V-phase, and W-phase winding coils, and has a varnish dripping impregnation property to the coil end portion of the V-phase winding coil. Can be improved.

The stator core includes two U-phase slots for inserting and arranging insertion side portions in the U-phase winding coil, and two V-phases for inserting and arranging insertion side portions in the V-phase winding coil. Slot and two W-phase slots for inserting and arranging the insertion side portion of the W-phase winding coil are sequentially and repeatedly formed. The first interphase insulating sheet and the second interphase insulating sheet are: It is preferable that a plurality of the stator cores are repeatedly arranged in the circumferential direction.
In this case, it is possible to insulate a plurality of three-phase winding coils inserted and disposed in the stator core using a plurality of first interphase insulating sheets and a second interphase insulating sheet.

  Further, two connecting portions in the first interphase insulating sheet and the second interphase insulating sheet are formed so as to connect the pair of insulating portions at two locations, and are located on one side in the circumferential direction of the stator core. The two W-phase slots are arranged next to one of the two W-phase slots, and the other side connector located on the other circumferential side of the stator core is next arranged. It is preferable to be inserted and arranged on one of the above (claim 4).

  In this case, each insulating portion in the first interphase insulating sheet and the second interphase insulating sheet is disposed on two U-phase slots and two V-phase slots, and W adjacent to both sides of these slots. Located over the phase slot. Thereby, the coil end part of each phase can be insulated with each phase insulation sheet of simple shape.

  Moreover, each connection part in the said 1st phase insulation sheet and the said 2nd phase insulation sheet is formed in three so that the said pair of insulation parts may be connected in three places, and it is located in the circumferential direction one side of the said stator core. One of the two W-phase slots is inserted and disposed in one of the two W-phase slots, and the intermediate connection portion positioned in the middle in the circumferential direction is next to the two W-phase slots. The other side connecting portion located on the other circumferential side of the stator core is inserted and arranged in one of the two W phase slots arranged next to each other. (Claim 5).

  In this case, each insulating portion in the first interphase insulating sheet and the second interphase insulating sheet includes two U phase slots, two V phase slots, two W phase slots, two U phase slots, and It arrange | positions on the slot for two V phases, and is arrange | positioned on the slot for W phases adjacent to the both sides of these slots. Also by this, the coil end part of each phase can be insulated by each phase insulation sheet of simple shape.

In addition, the one-side connecting portion and the other-side connecting portion in the first interphase insulating sheet and the second interphase insulating sheet are inserted and disposed in the outer W phase slot of the two W phase slots. In the first interphase insulating sheet and the second interphase insulating sheet disposed adjacent to each other, it is preferable that circumferential end portions of the respective insulating portions overlap with each other in the circumferential direction of the stator core. ).
In this case, since the end portions in the circumferential direction of the insulating portions in the interphase insulating sheets overlap with each other in the circumferential direction of the stator core, the coil end portions of the respective phases can be more reliably insulated.

The two U-phase slots include a U-phase one-side insertion side that is the insertion side located on one side in the circumferential direction of one of the U-phase winding coils, and the other U-phase. The U-phase other-side insertion side portion, which is the insertion side portion located on the other side in the circumferential direction of the winding coil, is inserted and disposed, and any one of the V-phase slots is provided in the two V-phase slots. V-phase one-side insertion side that is the insertion side located on one side in the circumferential direction of the other winding coil and the insertion-side portion located on the other side in the circumferential direction of the other V-phase winding coil V-phase other side insertion sides are inserted and arranged, and each insulating portion in the first interphase insulating sheet is connected to the U-phase one side insertion side and the U-phase other side insertion side, respectively. Convex shape that covers the rising part where the coil end part rises from the axial end of the stator core And each insulating portion in the second interphase insulating sheet includes the U-phase one side insertion side, the U-phase other side insertion side, the V-phase one side insertion side, and the V-phase other side. Preferably, each of the coil end portions connected to the insertion side portion has a convex portion that covers a rising portion that rises from an axial end portion of the stator core.
In this case, it is further possible that the interphase insulating sheets are displaced by forming the convex portions in the insulating portions of the first interphase insulating sheet and the insulating portions of the second interphase insulating sheet. It can be surely prevented.

Hereinafter, embodiments of the three-phase motor of the present invention will be described with reference to the drawings.
Example 1
In the three-phase motor of this example, as shown in FIGS. 1 and 10, the U-phase, V-phase, and W-phase three-phase winding coils 3 are inserted into slots 21 provided on the inner peripheral surface of the stator core 2. The stator 1 is provided.
As shown in FIG. 2, the winding coil 3 of each phase is formed by winding a wire 301 a plurality of times, and a pair of insertion side portions 31 inserted into the slot 21 and the pair of insertion side portions. It consists of a pair of coil end part 32 which connects 31 mutually.

  As shown in FIGS. 1 and 10, the U-phase winding coil 3U has a pair of insertion side portions 31 inserted into the slot 21 and a pair of coil end portions 32 formed of the stator core. 2 projectingly disposed from the axial end 22. Further, the V-phase winding coil 3V has a pair of insertion side portions 31 offset from the U-phase winding coil 3U by a predetermined number of slots toward the circumferential one side C1 of the stator core 2 in the slot 21. In addition, a part of the pair of coil end portions 32 is disposed so as to overlap the inner peripheral side of the pair of coil end portions 32 in the U-phase winding coil 3U. The W-phase winding coil 3W has a pair of insertion side portions 31 offset from the V-phase winding coil 3V by a predetermined number of slots toward the circumferential side C1 of the stator core 2 in the slot 21. In addition, a part of the pair of coil end portions 32 is disposed so as to overlap the inner peripheral side of the pair of coil end portions 32 in the V-phase winding coil 3V.

  As shown in FIGS. 1, 3 to 5, and 10, between the pair of coil end portions 32 in the U-phase winding coil 3 </ b> U and the pair of coil end portions 32 in the V-phase winding coil 3 </ b> V. Is provided with a first interphase insulating sheet 4A for performing these insulations. Further, a second interphase insulating sheet for performing insulation between the pair of coil end portions 32 in the V-phase winding coil 3V and the pair of coil end portions 32 in the W-phase winding coil 3W. 4B is provided.

As shown in FIGS. 1, 6, and 7, the first interphase insulating sheet 4 </ b> A and the second interphase insulating sheet 4 </ b> B include a pair of insulating portions 41 that respectively cover the coil end portions 32, and the pair of insulating portions 41. The connecting portions 42 are connected to each other and inserted into the slots 21 of the stator core 2. As shown in FIGS. 1 and 10, each of the connecting portions 42 in the first interphase insulating sheet 4A and the second interphase insulating sheet 4B has a pair of insertion side portions 31 in the W-phase winding coil 3W. It is inserted into the slot 21 provided.
This will be described in detail below.

  As shown in FIG. 2, the winding coil 3 of each phase of this example constitutes a single-pole coil formed by winding the electric wire 301 a plurality of times. The winding coils 3 of each phase are connected in a predetermined number of units to form a continuous coil. Specifically, four winding coils 3 of each phase in this example are connected to form a continuous coil, and two sets of continuous coils are inserted into the stator core 2. Moreover, the electric wire 301 of this example is a bundle of a plurality of wires formed by insulating coating.

As shown in FIGS. 8 to 10, the stator core 2 of this example includes two U-phase slots 21 </ b> U into which insertion side portions 31 in the U-phase winding coil 3 </ b> U are inserted and a V-phase winding coil 3 </ b> V. Two V-phase slots 21V for inserting and arranging the insertion side portions 31 and two W-phase slots 21W for inserting and arranging the insertion side portions 31 of the W-phase winding coil 3W are sequentially and repeatedly formed. .
A plurality of insertion side portions 31 in the winding coil 3 of each phase are inserted and arranged in each slot 21 in the circumferential direction of the stator core 2. The first interphase insulating sheet 4 </ b> A and the second interphase insulating sheet 4 </ b> B are repeatedly arranged in the circumferential direction of the stator core 2.

  Moreover, as shown in FIGS. 6 and 7, the connecting portions 42 in the first interphase insulating sheet 4 </ b> A and the second interphase insulating sheet 4 </ b> B of this example are formed so as to connect the pair of insulating portions 41 to each other at two locations. Has been. As shown in FIGS. 1 and 10, each connecting portion 42 is arranged such that one side connecting portion 42 a located on one side C <b> 1 in the circumferential direction of the stator core 2 is inserted into one of any two W-phase slots 21 </ b> W. The other-side connecting portion 42b located on the other circumferential side C2 of the stator core 2 is inserted and disposed in one of the two W-phase slots 21W arranged next. As a result, the insulating portions 41 in the first interphase insulating sheet 4A and the second interphase insulating sheet 4B are disposed on the two U-phase slots 21U and the two V-phase slots 21V. Is disposed on the W-phase slot 21W adjacent to the.

As shown in FIGS. 1 and 10, the one-side connecting portion 42a and the other-side connecting portion 42b in the first interphase insulating sheet 4A and the second interphase insulating sheet 4B are out of the circumferential direction of the two W-phase slots 21W. It is inserted into the W-phase slot 21W on the side. And the circumferential direction edge part 413 of each insulation part 41 in 4 A of 1st phase insulation sheets and the 2nd phase insulation sheet 4B arrange | positioned adjacent to each other has overlapped with the circumferential direction of the stator core 2. As shown in FIG. Thereby, the clearance toward the circumferential direction is not formed between the insulating portions 41 of the interphase insulating sheets arranged in the circumferential direction of the stator core 2, and the coil end portions 32 of each phase can be reliably insulated. it can.
The circumferentially outward W-phase slots 21W are two of the W-phase slots 21W located on both sides of the two U-phase slots 21U and the two adjacent V-phase slots 21V. This refers to a W-phase slot 21W located farther than two U-phase slots 21U and two V-phase slots 21V.

  Further, as shown in FIG. 1, in the two U-phase slots 21U, the U-phase one-side insertion side which is the insertion-side portion 31 located on one side C1 in the circumferential direction of any U-phase winding coil 3U. A portion 31Ua and a U-phase other side insertion side 31Ub, which is an insertion side 31 located on the other circumferential side C2 of the other U-phase winding coil 3U, are inserted and disposed. Further, in the two V-phase slots 21V, the V-phase one-side insertion side 31Va that is the insertion-side 31 located on the circumferential one side C1 of one of the V-phase winding coils 3V, and the other A V-phase other side insertion side 31Vb, which is an insertion side 31 located on the other circumferential side C2 of the V-phase winding coil 3V, is inserted and disposed.

As shown in FIGS. 3 and 6, each insulating portion 41 in the first interphase insulating sheet 4 </ b> A has coil end portions 32 respectively connected to the U-phase one side insertion side portion 31 </ b> Ua and the U-phase other side insertion side portion 31 </ b> Ub. A convex portion 412 that covers the rising portion 321 rising from the axial end portion 22 of the stator core 2 is provided.
As shown in FIGS. 4 and 7, each insulating portion 41 in the second interphase insulating sheet 4 </ b> B includes a U-phase one side insertion side 31 </ b> Ua, a U-phase other side insertion side 31 </ b> Ub, and a V-phase one side insertion side 31 </ b> Va. And each said coil end part 32 connected with the V-phase other side insertion side part 31Vb has the convex-shaped part 412 which covers the rising part 321 which rises from the axial direction edge part 22 of the stator core 2, respectively.

By forming these convex-shaped parts 412, it can prevent more reliably that each phase insulation sheet 4 will perform position shift.
Moreover, as shown in FIGS. 6 and 7, a planar shape portion 411 having a planar shape is formed in a portion other than the convex shape portion 412 in each insulating portion 41 in each interphase insulating sheet 4, and the convex shape portion 412. Projecting from the planar shape portion 411 toward the inner peripheral side of the stator core 2.

In addition, each interphase insulating sheet 4 is disposed in the stator core 2 by inserting the connecting portions 42 into the slots 21 of the stator core 2, thereby preventing displacement of the stator core 2 in the axial direction and the circumferential direction. Is done.
As shown in FIGS. 3 to 5, slot insulation sheets 45 are provided in each slot 21 of the stator core 2 to ensure insulation between the winding coils 3 of each phase. .

Next, a method for inserting and arranging the three-phase winding coil 3 in the stator core 2 will be described.
In inserting and arranging the three-phase winding coil 3 in the stator core 2, first, as shown in FIG. 8, the U-phase slot 21U of the stator core 2 has a pair of insertion side portions 31 in the U-phase winding coil 3U. And a pair of coil end portions 32 in the U-phase winding coil 3U project from the axial end portions 22 of the stator core 2. In order to insert and arrange the V-phase and W-phase winding coils 3 </ b> V and W in the stator core 2, the pair of coil end portions 32 in the U-phase winding coil 3 </ b> U inserted and arranged in the stator core 2 is replaced with the stator core 2. Is deformed and moved toward the outer peripheral side (see FIG. 3).

  Next, as shown in FIG. 8, the two connecting portions 42 in the first interphase insulating sheet 4A are inserted into the W phase slot 21W of the stator core 2 and the pair of insulating portions 41 in the first interphase insulating sheet 4A are provided. The U-phase coil end portion 32U is disposed so as to overlap the inner peripheral side. The insulating portion 41 of the first interphase insulating sheet 4A can cover the entire inner peripheral side surface of the U-phase coil end portion 32U.

  Further, the convex portion 412 in the connecting portion 42 of the first interphase insulating sheet 4A includes a rising portion 321 of the coil end portion 32 that is connected to the U-phase one-side insertion side portion 31Ua located on the circumferential side one side C1 of the stator core 2. Covering the rising portion 321 of the coil end portion 32 connected to the U-phase other-side insertion side portion 31Ub located on the other circumferential side C2 of the stator core 2, the remaining planar shape portion 411 is included in the pair of coil end portions 32. Oppositely disposed on the peripheral side surface (see FIGS. 3 and 6).

  Further, as shown in FIG. 8, a plurality of first interphase insulating sheets 4A are arranged in the circumferential direction of the stator core 2, and one side connecting portion 42a and the other side connecting portion 42b in each first interphase insulating sheet 4A are: The two W-phase slots 21W are inserted into the outer-side W-phase slot 21W. And the circumferential direction edge part 413 of each insulation part 41 in 4 A of 1st phase insulation sheets arrange | positioned adjacent to each other overlaps with the circumferential direction of the stator core 2.

  Next, as shown in FIG. 9, a pair of insertion side portions 31 in the V-phase winding coil 3 </ b> V are inserted and disposed in the V-phase slot 21 </ b> V of the stator core 2, and the axial end portions 22 of the stator core 2 are The pair of coil end portions 32 in the phase winding coil 3 </ b> V are projected. In order to insert and arrange the W-phase winding coil 3W in the stator core 2, the pair of coil end portions 32 in the V-phase winding coil 3V inserted and arranged in the stator core 2 are directed toward the outer peripheral side of the stator core 2. To deform and move (see FIG. 4).

  Next, as shown in FIG. 9, the two connecting portions 42 in the second interphase insulating sheet 4B are inserted into the W phase slot 21W of the stator core 2 and the pair of insulating portions 41 in the second interphase insulating sheet 4B are provided. The V-phase coil end portion 32V is overlapped with the inner peripheral side. The insulating portion 41 of the second interphase insulating sheet 4B can cover the entire inner peripheral side surface of the V-phase coil end portion 32V.

  In addition, the convex portion 412 in the connecting portion 42 of the second interphase insulating sheet 4B has a rising portion 321 and V of the coil end portion 32 that are connected to the U-phase one-side insertion side portion 31Ua located on the circumferential side one side C1 of the stator core 2. Rise part 321 of coil end part 32 connected to phase one side insertion side part 31Va, Rise part 321 of coil end part 32 connected to U phase other side insertion side part 31Ub located in the circumferential direction other side C2 of stator core 2 and V The other planar shape portion 411 is disposed opposite to the inner peripheral side surfaces of the pair of coil end portions 32 so as to cover the rising portion 321 of the coil end portion 32 connected to the other-side insertion side portion 31Vb (FIG. 4, FIG. 4). 7).

  Further, as shown in FIG. 9, a plurality of second interphase insulating sheets 4B are arranged in the circumferential direction of the stator core 2, and one side connecting portion 42a and the other side connecting portion 42b in each second interphase insulating sheet 4B are: Of the two W-phase slots 21W in which the one-side connecting portion 42a and the other-side connecting portion 42b of the first interphase insulating sheet 4A are inserted and arranged, the outer-side W-phase slot 21W is inserted and arranged. Is done. And the circumferential direction edge part 413 of each insulation part 41 in the 2nd phase insulation sheet 4B arrange | positioned adjacent to each other overlaps with the circumferential direction of the stator core 2. FIG.

Next, as shown in FIG. 10, a pair of insertion side portions 31 in the W-phase winding coil 3 </ b> W are inserted and disposed in the W-phase slot 21 </ b> W of the stator core 2, and the axial end portions 22 of the stator core 2 are The pair of coil end portions 32 in the phase winding coil 3 </ b> W are projected.
Thus, the three-phase winding coil 3 can be inserted and disposed in the stator core 2, and the winding coils 3 can be insulated from each other by the inter-phase insulating sheet 4.

Next, a method of dripping and impregnating varnish into the three-phase winding coil 3 inserted and disposed in the stator core 2 and an excellent function and effect of the three-phase motor will be described.
In carrying out the drop impregnation of the varnish, first, as shown in FIG. 11, the stator core 2 in which the three-phase winding coils 3 are inserted and arranged is rotated around the rotation axis formed in the horizontal direction. It is attached to a rotating device (not shown).

  The varnish is dropped from the outer peripheral side of the stator core 2 to the coil end portion 32 of the U-phase winding coil 3U in the stator core 2 by the U-phase nozzle 5U. Further, varnish is dropped from the inner peripheral side and the outer peripheral side of the stator core 2 to the coil end portion 32 of the V-phase winding coil 3V in the stator core 2 by the V-phase nozzle 5V. Further, varnish is dropped from the inner peripheral side of the stator core 2 to the coil end portion 32 of the W-phase winding coil 3W in the stator core 2 by the W-phase nozzle 5W.

  At this time, in the rising portion 321 in which the coil end portion 32 of the winding coil 3 of each phase rises from the axial end portion 22 of the stator core 2, as shown in FIG. 5, the rising portion of the W-phase coil end portion 32W. Although 321 is covered from the outer peripheral side by the connecting portion 42 of the first interphase insulating sheet 4A and the second interphase insulating sheet 4B, as shown in FIG. 4, the rising portion 321 of the V-phase coil end portion 32V is the outer periphery thereof. It is not covered by the connecting portion 42 of the first interphase insulating sheet 4A from the side.

Therefore, as shown in FIGS. 11 and 12, the varnish is dropped onto the V-phase coil end portion 32V directly from both the inner and outer peripheral sides of the rising portion 321 of the V-phase coil end portion 32V. it can. Therefore, varnish can be reliably dripped also to the V-phase coil end part 32V, and the dripping impregnation property of the varnish to the V-phase winding coil 3V can be improved.
Also, the U-phase and W-phase coil end portions 32U, W can be directly dropped and impregnated as in the prior art, and the dripping and impregnation properties of these varnishes can be maintained.

  Therefore, according to the three-phase motor having the stator 1 of this example, the dripping impregnation property of the varnish to the coil end portion 32 in the U-phase and W-phase winding coils 3U, W is maintained, and the V-phase winding is maintained. The dripping impregnation property of the varnish to the coil end part 32 in the coil 3V can be improved.

(Example 2)
In this example, as shown in FIGS. 13 and 14, three connecting portions 42 in the first interphase insulating sheet 4 </ b> A and the second interphase insulating sheet 4 </ b> B are formed so as to connect the pair of insulating portions 41 to each other at three locations. This is an example.
As shown in FIGS. 15 and 16, the first interphase insulating sheet 4A and the second interphase insulating sheet 4B in this example are either one of the one side connecting portions 42a located on the one side C1 in the circumferential direction of the stator core 2. Of the two W-phase slots 21W, the intermediate connecting portion 42c that is inserted into the W-phase slot 21W on the outer side in the circumferential direction and is located in the middle in the circumferential direction is one of the two W-phase slots 21W. Of the two W-phase slots 21W arranged next to each other, and the other-side connecting portion 42b positioned on the other circumferential side C2 of the stator core 2 is inserted and disposed in one of the two W-phase slots 21W. Inserted into the W-phase slot 21W on the outer side in the direction.

Thereby, each insulating part 41 in the first interphase insulating sheet 4A and the second interphase insulating sheet 4B includes two U-phase slots 21U, two V-phase slots 21V, two W-phase slots 21W, and two U-phases. It is disposed on the phase slot 21U and the two V-phase slots 21V, and is disposed on the W-phase slot 21W adjacent to both sides of these slots 21.
Also in this example, other configurations are the same as those of the first embodiment, and the same effects as those of the first embodiment can be obtained.

Explanatory drawing which expands and shows the stator in Example 1. FIG. FIG. 3 is an explanatory diagram schematically showing a stator in the first embodiment. Cross-sectional explanatory drawing which cuts and shows the coil end part of each phase in the slot for U phases in Example 1. FIG. Sectional explanatory drawing which cuts and shows the coil end part of each phase in the slot for V phases in Example 1. FIG. Sectional explanatory drawing which cuts and shows the coil end part of each phase in the slot for W phases in Example 1. FIG. The top view which shows the 1st phase insulation sheet in Example 1. FIG. The top view which shows the 2nd phase insulation sheet in Example 1. FIG. FIG. 3 is an explanatory diagram illustrating a state in which a U-phase winding coil and a first interphase insulating sheet are disposed on a stator core in the first embodiment. Explanatory drawing which shows the state which has arrange | positioned the V-phase winding coil and 2nd phase insulation sheet in Example 1 in the stator core. FIG. 3 is an explanatory diagram illustrating a state where a W-phase winding coil is disposed on a stator core in the first embodiment. FIG. 3 is an explanatory diagram illustrating a state in which varnish dripping impregnation is performed on a winding coil of each phase in the stator in the first embodiment. FIG. 3 is an explanatory diagram illustrating a state in which the V-phase winding coil in the stator is dripped and impregnated with varnish in the first embodiment. The top view which shows the 1st phase insulation sheet in Example 2. FIG. The top view which shows the 2nd phase insulation sheet in Example 2. FIG. Explanatory drawing which shows the state which has arrange | positioned the U-phase coil | winding coil and the 1st phase insulation sheet in Example 2 in the stator core. Explanatory drawing which shows the state which has arrange | positioned the V-phase winding coil and 2nd phase insulation sheet in Example 2 in the stator core. Explanatory drawing which shows the state which has arrange | positioned the U-phase winding coil and the 1st phase insulation sheet in the stator core in a prior art example. Explanatory drawing which shows the state which has arrange | positioned the V-phase coil | winding coil and the 2nd phase insulation sheet in the stator core in a prior art example. Explanatory drawing which shows the state which performs the dripping impregnation of a varnish to the winding coil of the V phase in a stator in a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 2 Stator core 21U, V, W Slot 22 Axial direction end part 3 Winding coil 31 Insertion side part 32U, V, W Coil end part 321 Rising part 4A 1st phase insulation sheet 4B 2nd phase insulation sheet 41 Insulation part 412 Convex part 42 connecting part C1 circumferential one side C2 circumferential other side

Claims (7)

In a three-phase motor having a stator in which U-phase, V-phase and W-phase three-phase winding coils are inserted and disposed in slots provided on the inner peripheral surface of the stator core, respectively.
The winding coil of each phase is formed by winding a wire a plurality of times, and includes a pair of insertion sides inserted into the slot and a pair of coil end portions connecting the pair of insertion sides. Become
Between the pair of coil end portions in the U-phase winding coil and the pair of coil end portions in the V-phase winding coil, a first interphase insulating sheet is provided to insulate them. A second inter-phase insulating sheet for performing insulation between the pair of coil end portions in the V-phase winding coil and the pair of coil end portions in the W-phase winding coil. Arranged,
The first interphase insulating sheet and the second interphase insulating sheet include a pair of insulating portions that respectively cover the coil end portions, a connecting portion that connects the pair of insulating portions, and is inserted into the slot. Have
Each of the connecting portions in the first interphase insulating sheet and the second interphase insulating sheet is inserted and disposed in a slot in which a pair of insertion side portions in the W-phase winding coil is inserted and disposed. A characteristic three-phase motor. 2. The U-phase winding coil according to claim 1, wherein the pair of insertion side portions are inserted and disposed in the slot, and the pair of coil end portions project from the axial end of the stator core. Has been
The V-phase winding coil has a pair of insertion sides offset from the U-phase winding coil by a predetermined number of slots toward one side in the circumferential direction of the stator core, and is inserted into the slot. And a part of the pair of coil end portions is disposed so as to overlap the inner peripheral side of the pair of coil end portions in the U-phase winding coil,
The W-phase winding coil has a pair of insertion sides that are offset from the V-phase winding coil by a predetermined number of slots toward one side in the circumferential direction of the stator core and are inserted into the slots. A three-phase motor characterized in that a part of the pair of coil end portions is disposed so as to overlap the inner peripheral side of the pair of coil end portions in the V-phase winding coil. 3. The stator core according to claim 1, wherein the stator core has two U-phase slots for inserting and arranging insertion side portions in the U-phase winding coil, and an insertion side portion in the V-phase winding coil. Two V-phase slots and two W-phase slots for inserting and arranging insertion side portions in the W-phase winding coil are sequentially formed.
A three-phase motor, wherein a plurality of the first interphase insulating sheets and the second interphase insulating sheets are repeatedly arranged in a circumferential direction of the stator core.   In Claim 3, two each connection part in the said 1st phase insulation sheet and the said 2nd phase insulation sheet is formed so that the said pair of insulation parts may be connected in two places, The circumferential direction one side of the said stator core One of the two W-phase slots is inserted and disposed in one of the two W-phase slots, and the other W-connecting part located on the other circumferential side of the stator core is next aligned. A three-phase motor, wherein the motor is inserted and disposed in one of the phase slots.   In Claim 3, three each connection part in the said 1st phase insulation sheet and the said 2nd phase insulation sheet is formed so that said pair of insulation parts may be connected in three places, and the circumferential direction one side of the said stator core The one side connecting portion located on the side is inserted and disposed in one of the two W-phase slots, and the intermediate connecting portion located in the middle in the circumferential direction is used for any two of the W-phase slots. Inserted into one of the two W-phase slots arranged next to the slot, and the other-side connecting portion located on the other circumferential side of the stator core is inserted into one of the two W-phase slots arranged next. A three-phase motor characterized in that   In Claim 4 or 5, the one side connection part and the other side connection part in the said 1st interphase insulation sheet and the said 2nd interphase insulation sheet are the slots for the W phase on the outer side of the two W phase slots. The circumferential end portions of the insulating portions of the first interphase insulating sheet and the second interphase insulating sheet that are inserted and disposed adjacent to each other overlap with the circumferential direction of the stator core. A characteristic three-phase motor. The U phase one side which is the said insertion side part located in the circumferential direction one side of one of the said U-phase winding coils in said two U-phase slot in any one of Claims 3-6 An insertion side portion and a U-phase other side insertion side portion which is the insertion side portion located on the other circumferential side of the other U-phase winding coil are inserted and arranged,
The two V-phase slots include a V-phase one-side insertion side that is the insertion side located on one side in the circumferential direction of one of the V-phase winding coils, and the other V-phase windings. The V-phase other side insertion side part, which is the insertion side part located on the other side in the circumferential direction of the wire coil, is inserted and disposed.
Each insulating portion in the first interphase insulating sheet is formed by rising each coil end portion connected to the U-phase one side insertion side and the U-phase other side insertion side from the axial end of the stator core. Has a convex part covering the part,
Each insulating portion in the second interphase insulating sheet is connected to the U-phase one-side insertion side, the U-phase other-side insertion side, the V-phase one-side insertion side, and the V-phase other-side insertion side, respectively. 3. A three-phase motor, wherein each of the coil end portions has a convex portion that covers a rising portion that rises from an axial end portion of the stator core.

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