JP6914800B2 - Rotating machine stator - Google Patents

Description

The present invention relates to a stator of a rotary electric machine.

The stator of a rotary electric machine is configured by winding a coil around a stator core. The temperature of the stator rises due to heat generated by copper loss and iron loss when the rotary electric machine operates. Therefore, there is known a cooling method in which a cooling pipe is arranged in a hole penetrating the stator core or a refrigerant flow path is formed in a bolt inserted through the stator core to cool the stator core (see Patent Documents 1 and 2). In such a cooling method, a cooling flow path can be formed even when there is not enough space for arranging the cooling pipe around the stator core.

Japanese Unexamined Patent Publication No. 10-336966 Japanese Unexamined Patent Publication No. 2011-234431

However, in the cooling methods described in Patent Documents 1 and 2, even if the stator core can be cooled, the coil cannot be cooled, and there is a possibility that the stator cannot be appropriately cooled in the region where the copper loss becomes large.

The present invention provides a technique capable of appropriately cooling a coil in a stator of a rotary electric machine.

One aspect of the present invention is
A stator core having an annular stator core body and a stator core fixing portion provided on the outer peripheral portion of the stator core body and formed with bolt through holes.
A coil attached to the stator core and arranged so that the crossover portion protrudes from the end face of the stator core.
A bolt that is inserted through the bolt through hole and fixes the stator core to the housing.
A stator of a rotary electric machine having a collar arranged between the bolt head of the bolt and the end face of the stator core and having a bolt insertion hole formed therein.
The bolt is provided with a bolt refrigerant flow path having a refrigerant introduction portion into which the refrigerant is introduced and a first refrigerant outlet portion for supplying the refrigerant to the crossover portion.
The collar includes a refrigerant discharge portion arranged so as to face the crossover portion, and a color refrigerant flow path that communicates the first refrigerant outlet portion of the bolt and the refrigerant discharge portion .
The collar is provided with an engaging portion that engages with the end face of the stator core .

According to the above aspect, by supplying the refrigerant to the crossover portion of the coil through the bolt refrigerant flow path provided in the bolt, the coil can be appropriately cooled and copper loss can be suppressed.

It is a perspective view of the stator of the rotary electric machine which concerns on one Embodiment of this invention. It is an exploded perspective view of the main part of the stator of the rotary electric machine shown in FIG. It is sectional drawing of the stator of the rotary electric machine shown in FIG. It is a perspective view of color. It is a perspective view of the stator core refrigerant flow path. FIG. 5 is a cross-sectional view taken along the line AA of FIG. It is a side view of the main part of the steel plate provided with an opening. It is a side view of the main part of a stator core in which steel plates having different outer diameter dimensions are laminated to form a stator core refrigerant flow path.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 3, the stator 10 of a rotary electric machine includes a stator core 11 and a coil 12 wound around a tooth of the stator core 11. The coil 12 is formed with a crossover portion 13 so as to project from the end surface 21 of the stator core 11. The stator core 11 is formed by laminating a plurality of steel plates 14 (14A, 14B) such as electromagnetic steel plates, and is provided on an annular stator core main body 15 and an outer peripheral portion of the stator core main body 15 (6 in the embodiment shown in the figure). The stator core fixing portion 16 and the like.

A bolt through hole 19 through which a bolt 18 is inserted is formed in the stator core fixing portion 16. The stator core 11 is fixed by a plurality of bolts 18 that are inserted into the bolt through holes 19 and screwed into the housing 17. The bolt 18 includes a bolt head 20, and sandwiches the stator core 11 between the bolt head 20 and the housing 17 via a collar 27 arranged between the bolt head 20 and the end surface 21 of the stator core fixing portion 16.

Inside the bolt 18, a bolt refrigerant flow path 22 extending in the axial direction through the substantially axial center is provided. The bolt refrigerant flow path 22 includes a refrigerant introduction section 23 that opens on the end surface opposite to the bolt head 20, a first refrigerant lead-out section 24 that is formed in the radial direction and communicates with the bolt refrigerant flow path 22, and a second refrigerant lead-out section. A unit 25 is provided. That is, the refrigerant introduction section 23, the first refrigerant lead-out section 24, and the second refrigerant lead-out section 25 form a part of the bolt refrigerant flow path 22.

A pipe 26 for supplying a refrigerant R such as cooling oil from a refrigerant supply unit (not shown) is connected to the refrigerant introduction unit 23. The first refrigerant outlet 24 opens in the bolt insertion hole 28 of the collar 27, and the second refrigerant outlet 25 opens in the bolt through hole 19.

With reference to FIG. 4, the collar 27 includes a refrigerant reservoir 29 formed by expanding the axial intermediate portion of the bolt insertion hole 28, a refrigerant discharge portion 30 opening on the outer peripheral surface of the collar 27, and a refrigerant reservoir. A radial hole 31 for communicating the unit 29 and the refrigerant discharge unit 30 is provided. That is, the refrigerant reservoir 29, the radial hole 31, and the refrigerant discharge portion 30 form the color refrigerant flow path 32. In this embodiment, the collar 27 is provided with two refrigerant discharge units 30, but only one is shown. The number and position of the refrigerant discharge portions 30 can be appropriately set.

Further, an engaging portion 33 is formed so as to project in the axial direction on the side surface of the collar 27 that abuts on the end surface 21 of the stator core fixing portion 16. The engaging portion 33 engages with the engaging groove 34 (see FIG. 2) formed in the end surface 21 of the stator core fixing portion 16 so that the refrigerant discharge portion 30 faces the crossover portion 13 of the coil 12 and the collar 27 The orientation of is positioned.

As a result, when the stator core 11 and the collar 27 are assembled to the housing 17 with the bolt 18, the direction of the refrigerant discharge portion 30 is ensured by engaging the engaging portion 33 of the collar 27 with the engaging groove 34 of the stator core fixing portion 16. Can be assembled toward the crossover portion 13 of the coil 12, preventing erroneous assembly and simplifying the assembly process. Further, since the first refrigerant lead-out unit 24 only needs to communicate with the refrigerant reservoir portion 29 of the collar 27, it is not necessary to limit the phase of the bolt 18, and the allowable range of the axial position is large, so that the first refrigerant lead-out unit 24 is led out. The tightening amount can be appropriately set without worrying about the position of the portion 24.

The refrigerant R supplied from the refrigerant supply unit (not shown) is a pipe 26, a refrigerant introduction unit 23, a bolt refrigerant flow path 22, a first refrigerant discharge unit 24, and a color refrigerant flow path, as shown by arrows in FIG. It is discharged from the refrigerant discharge portion 30 toward the crossing portion 13 of the coil 12 via the 32 to effectively cool the coil 12.

As shown in FIGS. 5 to 7 and 6, the stator core 11 is formed by laminating and adhering a plurality of steel plates 14A having an opening 35 and a plurality of steel plates 14B having a notch 36.

As shown in FIG. 5, in the steel plate 14A, a plurality of types of steel plates having different circumferential positions of the openings 35 are laminated so that the openings 35 communicate with the bolt through holes 19 and the openings of the adjacent steel plates 14A are opened. The portions 35 communicate with each other in the axial direction. Further, the steel plate 14A having the opening 35 and the steel plate 14B having the notch 36 are laminated adjacent to each other, so that the opening 35 of the steel plate 14A and the notch 36 of the steel plate 14B communicate with each other. As a result, the stator core refrigerant flow path 38 that guides the refrigerant R from the bolt through hole 19 to the outer peripheral surface of the stator core 11 is formed.

Then, as shown in FIG. 3, the refrigerant R supplied from the second refrigerant outlet 25 of the bolt refrigerant flow path 22 to the bolt through hole 19 has an opening 35 and a notch, respectively, as shown by an arrow in FIG. It is guided to the outer peripheral surface of the stator core 11 through the portion 36, that is, the stator core refrigerant flow path 38, and flows along the outer peripheral surface to cool the stator core 11. As a result, the stator core 11 is effectively cooled by being cooled from the inside and the outside at the same time.

As shown in FIG. 8, in the stator core 11, a plurality of steel plates 14 having different outer diameter dimensions are alternately laminated to form a plurality of irregularities on the outer peripheral surface of the stator core 11 in the axial direction, and the recesses are formed in the radial direction. Extends to. As a result, the surface area of the outer peripheral surface of the stator core 11 with which the refrigerant R comes into contact is increased, and the cooling performance is improved. Further, the refrigerant R supplied from the notch 36 to the outer peripheral surface of the stator core 11 flows along the recess and is prevented from flowing down to the side of the stator core 11 so that it can be effectively cooled.

That is, a part of the refrigerant R supplied from the refrigerant supply unit to the bolt refrigerant flow path 22 is discharged from the refrigerant discharge unit 30 of the collar 27 toward the crossover portion 13 of the coil 12 to directly cool the coil 12. The other part is supplied to the stator core refrigerant flow path 38 of the stator core 11 to cool the stator core 11 from the inside and the outside (outer peripheral surface). As a result, copper loss and iron loss of the stator 10 of the rotary electric machine can be suppressed.

The present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, and the like.
In the above-described embodiment, the case where the crossover portion 13 protruding from the end surface 21 of the stator core 11 is cooled has been described, but in order to cool the crossover portion 13 protruding from the end surface 41 (see FIG. 3) on the opposite side of the stator core 11. , Another refrigerant lead-out portion communicating with the bolt refrigerant flow path 22 may be provided, and a through hole communicating with the refrigerant lead-out portion may be provided in the housing 17. As a result, the refrigerant R supplied from the refrigerant supply unit (not shown) projects from the end surface 41 on the opposite side of the stator core 11 via the pipe 26, the refrigerant introduction unit 23, the refrigerant outlet unit, and the through holes of the housing 17. It is discharged toward the crossing portion 13 of the coil 12. Therefore, the crossover portion 13 protruding from the end surface 41 on the opposite side of the stator core 11 is also cooled.

[Summary]
The following aspects are extracted from the above embodiments. The components and the like corresponding to the above-described embodiments are shown in parentheses, but the present invention is not limited thereto.

(1) An annular stator core main body (stator core main body 15) and a stator core fixing portion (stator core fixing portion 16) provided on the outer peripheral portion of the stator core main body and formed with a bolt through hole (bolt through hole 19). With the stator core (stator core 11)
A coil (coil 12) attached to the stator core and arranged so that a crossover portion (crossover portion 13) protrudes from an end surface (end surface 21) of the stator core.
A rotary electric machine stator (rotary electric machine stator 10) including a bolt (bolt 18) that is inserted into the bolt through hole and fixes the stator core to the housing (housing body 17).
The bolt has a refrigerant introduction section (refrigerant introduction section 23) into which the refrigerant (refrigerant R) is introduced and a first refrigerant lead-out section (first refrigerant lead-out section 24) for supplying the refrigerant to the cross section. A flow path (bolt refrigerant flow path 22) is provided.

According to (1), by supplying the refrigerant to the crossover portion of the coil through the bolt refrigerant flow path provided in the bolt, the coil can be appropriately cooled and copper loss can be suppressed.

(2) In the stator of the rotary electric machine according to (1),
Further provided with a collar (collar 27) arranged between the bolt head (bolt head 20) of the bolt and the end face of the stator core and formed with a bolt insertion hole (bolt insertion hole 28).
The collar is a color refrigerant flow path (color) that communicates a refrigerant discharge portion (refrigerant discharge portion 30) arranged so as to face the crossover portion, the first refrigerant outlet portion of the bolt, and the refrigerant discharge portion. A refrigerant flow path 32) is provided.

According to (2), by making the color refrigerant discharge portion face the crossover portion of the coil, the refrigerant can be reliably supplied to the crossover portion. Further, the tightening amount can be appropriately set without worrying about the position of the first refrigerant outlet portion of the bolt.

(3) In the stator of the rotary electric machine according to (2),
The collar is provided with an engaging portion (engaging portion 33) that engages with the end face of the stator core.

According to (3), the collar can be appropriately positioned, and the refrigerant discharge portion of the collar can be easily opposed to the crossover portion of the coil.

(4) In the stator of the rotary electric machine according to (3),
The bolt has a second refrigerant lead-out portion (second refrigerant lead-out portion 25) that communicates with the bolt refrigerant flow path and opens in the bolt through hole.

According to (4), the stator core can be cooled through the second refrigerant outlet and the bolt through hole.

(5) In the stator of the rotary electric machine according to (4),
The stator core has a stator core refrigerant flow path (stator core refrigerant flow path 38) that guides the refrigerant from the bolt through hole to the outer peripheral surface of the stator core.

According to (5), the outer peripheral surface of the stator core can be cooled via the second refrigerant lead-out portion, the bolt through hole, and the stator core refrigerant flow path. As a result, the stator core can be appropriately cooled and iron loss can be suppressed.

(6) In the stator of the rotary electric machine according to (5),
The stator core is formed by laminating a plurality of steel plates (steel plates 14).
The stator core refrigerant flow path is formed of a steel plate (steel plate 14A) having an opening (opening 35) and a steel plate (steel plate 14B) having a notch (notch 36).

According to (6), the stator core can form a stator core refrigerant flow path by laminating a steel plate having an opening and a steel plate having a notch.

(7) In the stator of the rotary electric machine according to any one of (1) to (6),
The outer peripheral surface of the stator core has a plurality of irregularities in the axial direction.

According to (7), since the surface area of the outer peripheral surface of the stator core is increased, the refrigerant supplied from the stator core refrigerant flow path is guided in the circumferential direction to improve the cooling efficiency.

(8) In the stator of the rotary electric machine according to (7),
The stator core is formed by laminating a plurality of steel plates (steel plates 14).
The unevenness is formed by laminating steel plates (steel plates 14A and 14B) having different outer diameter dimensions.

According to (8), a plurality of irregularities can be easily formed on the outer peripheral surface of the stator core by laminating steel plates having different outer diameter dimensions.

10 Rotating electric machine stator 11 stator core 12 coil 13 crossing part 14 (14A, 14B) steel plate 15 stator core body 16 stator core fixing part 17 housing 18 bolt 19 bolt through hole 20 bolt head 21 stator core end face 22 bolt refrigerant flow path 23 refrigerant introduction part 24 1st refrigerant outlet 25 2nd refrigerant outlet 27 Color 28 Bolt insertion hole 30 Refrigerant discharge 32 Color refrigerant flow path 33 Engagement section 35 Opening section 36 Notch 38 Stator core Refrigerant flow path R Refrigerant

Claims (6)

A stator core having an annular stator core body and a stator core fixing portion provided on the outer peripheral portion of the stator core body and formed with bolt through holes.
A coil attached to the stator core and arranged so that the crossover portion protrudes from the end face of the stator core.
A bolt that is inserted through the bolt through hole and fixes the stator core to the housing.
A stator of a rotary electric machine having a collar arranged between the bolt head of the bolt and the end face of the stator core and having a bolt insertion hole formed therein.
The bolt is provided with a bolt refrigerant flow path having a refrigerant introduction portion into which the refrigerant is introduced and a first refrigerant outlet portion for supplying the refrigerant to the crossover portion.
The collar includes a refrigerant discharge portion arranged so as to face the crossover portion, and a color refrigerant flow path that communicates the first refrigerant outlet portion of the bolt and the refrigerant discharge portion .
A stator of a rotary electric machine, wherein the collar is provided with an engaging portion that engages with the end face of the stator core. The stator of the rotary electric machine according to claim 1.
The bolt is a stator of a rotary electric machine having a second refrigerant lead-out portion that communicates with the bolt refrigerant flow path and opens in the bolt through hole. The stator of the rotary electric machine according to claim 2.
The stator core is a stator of a rotary electric machine having a stator core refrigerant flow path that guides a refrigerant from a bolt through hole to an outer peripheral surface of the stator core. The stator of the rotary electric machine according to claim 3.
The stator core is formed by laminating a plurality of steel plates.
The stator core refrigerant flow path is a stator of a rotary electric machine formed of a steel plate having an opening and a steel plate having a notch. The stator of the rotary electric machine according to any one of claims 1 to 4.
The outer peripheral surface of the stator core is a stator of a rotary electric machine having a plurality of irregularities in the axial direction. The stator of the rotary electric machine according to claim 5.
The stator core is formed by laminating a plurality of steel plates.
The unevenness is a stator of a rotary electric machine formed by laminating steel plates having different outer diameter dimensions.

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