JP2019115206A - Stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of intensively cooling a portion of a stator of a rotary electric machine which generates heat according to a load condition while suppressing a cost. SOLUTION: A stator 10 of a rotary electric machine includes a stator core 11, a coil 12, and a bolt 18 for fixing the stator core 11 to a housing 17. The stator core 11 has a stator core refrigerant flow path 38 that guides the refrigerant R from the bolt through hole 19 to the inside of the stator core 11 or the outer peripheral surface of the stator core 11, and the bolt 18 has a bolt refrigerant flow path 22. The bolt refrigerant flow path 22 includes a refrigerant introduction section 23 into which the refrigerant R is introduced, a first refrigerant lead-out section 24 that supplies the refrigerant R to the crossing section 13, and a second refrigerant lead-out that supplies the refrigerant to the stator core refrigerant flow path 38. It has a part 25 and. The bolt through hole 19 or the stator core refrigerant flow path 38 has a refrigerant flow path adjusting portion 40 including a shape memory ring 43 whose shape changes depending on the temperature. [Selection diagram] Fig. 2

Description

  The present invention relates to a stator of a rotating electrical machine.

  The stator of the rotating electrical machine is configured by winding a coil around a stator core. The temperature of the stator rises due to heat generation due to copper loss or iron loss when the rotary electric machine operates. The rotating electric machine has different portions that generate heat depending on the load conditions. For example, copper loss is dominant in the high torque low rotation region, and iron loss is dominant in the low torque high rotation region. That is, since the heat generation part is different depending on the load condition, it is preferable to mainly cool the heat generation part according to the load condition.

  For example, in the case of Patent Document 1, a portion that generates heat is estimated from the driving state of the motor, and a pipe through which the refrigerant flows is switched to flow the refrigerant to the stator or the coil.

JP 2008-263753 A

  However, the cooling method described in Patent Document 1 requires parts such as a valve and an actuator, resulting in an increase in size of the system and an increase in cost.

  The present invention provides a technique capable of mainly cooling a portion that generates heat according to load conditions in a stator of a rotating electrical machine while suppressing the cost.

One aspect of the present invention is
A stator core having an annular stator core body, and a stator core fixing portion provided on an outer peripheral portion of the stator core body and having a bolt through hole formed therein;
A coil attached to the stator core and disposed such that a transition portion projects from an end face of the stator core;
A stator of a rotary electric machine comprising: a bolt inserted into the bolt through hole and fixing the stator core to a housing;
The stator core has a stator core refrigerant flow path for guiding the refrigerant from the bolt through holes to the inside of the stator core or the outer peripheral surface of the stator core,
The bolt has a bolt refrigerant flow path,
The bolt refrigerant flow path includes a refrigerant introduction portion into which the refrigerant is introduced, a first refrigerant discharge portion supplying the refrigerant to the transfer portion, and a second refrigerant discharge portion supplying the refrigerant to the stator core refrigerant flow path. Have
The bolt through hole or the stator core refrigerant flow path has a refrigerant flow path adjustment unit including a shape memory member whose shape changes with temperature.

  According to the above aspect, the coil can be appropriately cooled by supplying the refrigerant to the transition portion of the coil via the bolt refrigerant flow path and the first refrigerant lead-out portion through the refrigerant introduced from the refrigerant lead-in portion, and copper loss Can be reduced. In addition, by supplying the refrigerant introduced from the refrigerant introduction part to the inside of the stator core or the outer peripheral surface of the stator core through the bolt refrigerant flow path, the second refrigerant lead-out part, and the stator core refrigerant flow path, the stator core can be appropriately made. It can be cooled and iron loss can be suppressed.

  Furthermore, since the bolt through hole or the stator core refrigerant flow path has the refrigerant flow path adjustment unit including the shape memory member whose shape changes with temperature, the refrigerant flow path adjustment unit mainly supplies the refrigerant according to the temperature. The flow path can be selected.

It is a perspective view of a stator of rotation electrical machinery concerning a 1st embodiment of the present invention. It is a principal part disassembled perspective view 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 IV-IV sectional drawing of FIG. It is a perspective view of a shape memory ring. It is a perspective view of a steel ring. It is a side view of a steel ring It is a sectional view showing the state where the refrigerant introduced from the refrigerant introduction part is supplied to the bridge part of a coil via the bolt refrigerant channel, the 1st refrigerant lead-out part, and the color refrigerant discharge part. It is VII-VII sectional drawing of FIG. 7A. The refrigerant flow path adjusting portion is opened, and the refrigerant introduced from the refrigerant introduction portion is supplied to the transition portion of the coil, and the outer peripheral surface of the stator core via the second refrigerant lead portion, the bolt through hole, and the stator core refrigerant flow path It is sectional drawing which shows the state supplied to FIG. It is a VIII-VIII sectional view of Drawing 8A. It is sectional drawing of the stator of the rotary electric machine which concerns on 2nd Embodiment of this invention. It is IX-IX sectional drawing of FIG. 9A. The cross-sectional view showing a state where the flow rate control device is opened and the refrigerant introduced from the refrigerant introducing part is supplied to the transition part of the coil through the bolt refrigerant flow path, the first refrigerant lead-out part, and the color refrigerant discharging part. is there. It is XX sectional drawing of FIG. 10A. FIG. 6 is a cross-sectional view showing a state in which the flow control device is closed and the refrigerant introduced from the refrigerant introduction part is mainly supplied to the outer peripheral surface of the stator core through the stator refrigerant flow path. It is XI-XI sectional drawing of FIG. 11A.

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

First Embodiment
First, a stator of a rotary electric machine according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 8B.

  As shown in FIGS. 1 to 3, the stator 10 of the rotary electric machine includes a stator core 11 and a coil 12 wound around teeth of the stator core 11. A crossover portion 13 is formed to project the coil 12 from the end face 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 the outer peripheral portion of the stator core main body 15 (in the embodiment shown in FIG. And the stator core fixing portion 16).

  Referring to FIG. 4, in the plurality of steel plates 14, the plurality of steel plates 14 </ b> A having the openings 35 and the plurality of steel plates 14 </ b> B having the notches 36 are stacked and bonded to form the stator core 11. The steel plate 14A has a plurality of steel plates 14A of different positions in the circumferential direction of the opening 35 stacked, so that the opening 35 communicates with a bolt through hole 19 described later, and the openings 35 of the adjacent steel plates 14A communicate with each other. It communicates in the axial direction. Further, by laminating the steel plate 14A having the opening 35 and the steel plate 14B having the notch 36 adjacent to each other, the opening 35 and the notch 36 communicate with each other, and the refrigerant R is transferred from the bolt through hole 19 to the stator core. A stator core refrigerant flow passage 38 is formed which leads to the outer peripheral surface of 11.

  Further, by alternately laminating a plurality of steel plates 14 having different outer diameter dimensions, a plurality of irregularities are formed in the axial direction on the outer peripheral surface of the stator core 11, and the surface area of the outer peripheral surface of the stator core 11 with which the refrigerant R contacts is It increases to improve the cooling performance. Further, the refrigerant R flows along the recess and is prevented from flowing down to the side of the stator core 11.

  The stator core fixing portion 16 is formed with a bolt through hole 19 through which the bolt 18 is inserted. The stator core 11 is fixed by a plurality of bolts 18 inserted into the bolt through holes 19 and screwed to the housing 17. The bolt 18 has a bolt head 20 and clamps the stator core 11 between the bolt head 20 and the housing 17 via a collar 27 disposed between the bolt head 20 and the end surface 21 of the stator core fixing portion 16.

  Inside the bolt 18, there is provided a bolt refrigerant flow passage 22 which extends in the axial direction substantially through the axial center. The bolt refrigerant flow passage 22 has a refrigerant introduction portion 23 opened at an end surface opposite to the bolt head 20, a first refrigerant discharge portion 24 formed in a radial direction and communicated with the bolt refrigerant flow passage 22, and a second refrigerant discharge. And a unit 25. That is, the refrigerant introduction portion 23, the first refrigerant lead-out portion 24, and the second refrigerant lead-out portion 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 lead-out portion 24 opens into the bolt insertion hole 28 of the collar 27, and the second refrigerant lead-out portion 25 opens into the bolt through hole 19.

  The collar 27 has a refrigerant reservoir 29 formed by expanding the axial intermediate portion of the bolt insertion hole 28, a refrigerant discharge unit 30 opened to the outer peripheral surface of the collar 27, a refrigerant reservoir 29 and a refrigerant discharge unit 30. And the radial direction hole 31 which makes it communicate. That is, the refrigerant reservoir portion 29, the radial holes 31, and the refrigerant discharge portion 30 form the color refrigerant flow path 32.

  Further, on the side surface of the collar 27 in contact with the end face 21 of the stator core fixing portion 16, an engaging portion 33 is formed so as to protrude in the axial direction. The engagement portion 33 engages with the engagement groove 34 (see FIG. 2) formed on the end face 21 of the stator core fixing portion 16 so that the refrigerant discharge portion 30 faces the crossover portion 13 of the coil 12. Orientation 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 engaging portion 33 of the collar 27 and the engaging groove 34 of the stator core fixing portion 16 are engaged to ensure the direction of the refrigerant discharge portion 30 Can be assembled toward the crossover portion 13 of the coil 12, so that incorrect assembly is prevented and the assembly process is simplified. Further, since the first refrigerant lead-out portion 24 only needs to be communicated with the refrigerant reservoir portion 29 of the collar 27, there is no need to limit the phase of the bolt 18, and furthermore, the allowable range of the axial position is large. The amount of tightening can be set appropriately without regard to the position of the portion 24.

  As shown in FIGS. 3 and 4, a refrigerant reservoir 41 communicating with the stator core refrigerant channel 38 is formed at the opening of the stator core refrigerant channel 38 of the bolt through hole 19. At a part of the refrigerant reservoir 41 in the circumferential direction, a projection 42 projecting to the inner diameter side is formed. That is, the refrigerant reservoir portion 41 is a groove having a substantially C-shaped cross section.

  In the coolant reservoir portion 41, a shape memory ring 43 and a steel ring 44 having a substantially C-shaped cross section, which configure the coolant flow path adjusting portion 40, are disposed sequentially from the radially outer side. The shape memory ring 43 is in close contact with the inner peripheral surface of the refrigerant reservoir 41 at normal times (when the temperature is lower than a predetermined temperature), and closes the inlet of the stator core refrigerant flow path 38. The shape memory ring 43 is in contact with the inner circumferential surface of the refrigerant reservoir 41 and functions as a temperature sensing unit that senses the temperature of the refrigerant reservoir 41. Further, the steel material ring 44 is disposed in close contact with the inner peripheral surface of the shape memory ring 43. When the shape memory ring 43 and the steel material ring 44 are incorporated into the refrigerant reservoir 41, the shape memory ring 43 and the steel material ring 44 are prevented from rotating by the projection 42 and the circumferential position is positioned.

  As shown in FIG. 5, FIG. 6A, and FIG. 6B, the shape memory ring 43 is a ring having a substantially C-shaped cross section partially cut away, and is formed of a shape memory alloy. The shape memory ring 43 stores its shape so as to reduce its diameter when it reaches a predetermined temperature or more.

  Similar to the shape memory ring 43, the steel material ring 44 is a ring having a substantially C-shaped cross section, and the thickness t1 of the portion opposite to the notch portion is large, and the thickness is gradually reduced toward the end 45, The thickness t2 of the end 45 is the thinnest. The portion formed gradually thinner toward the end portion 45 functions as a deformation portion. The end 45 which is easily deformed in the radial direction due to the thin wall thickness t2 functions as an adjustment unit that controls the supply of the refrigerant to the stator core refrigerant passage 38.

  Next, with reference to FIG. 7 and FIG. 8, an operation of the stator 10 of the rotating electrical machine of the present embodiment which can mainly cool the portions (the stator core 11 and the coil 12) which generate heat according to load conditions will be described. .

  As shown in FIGS. 7A and 7B, the temperature of the coil 12 is high and the temperature of the stator core 11 is in a relatively low temperature state (a state lower than a predetermined temperature) in a high torque low rotation region in which copper loss is dominant. . In this case, cooling the coil 12 with the refrigerant R is effective for improving the efficiency of the rotating electrical machine.

  When the stator core 11 is in a relatively low temperature state, the shape memory ring 43 is in close contact with the inner peripheral surface of the refrigerant reservoir 41, so the inlet of the stator core refrigerant flow path 38 is closed. Therefore, the flow of the refrigerant R supplied from the refrigerant supply unit (not shown) from the bolt refrigerant passage 22 to the stator core refrigerant passage 38 is blocked by the refrigerant passage adjusting unit 40 (shape memory ring 43 and steel ring 44) It does not flow to the stator core 11 side. Note that the flow to the stator core refrigerant flow path 38 does not necessarily have to be shut off, and the flow to the stator core refrigerant flow path 38 may be reduced.

  At this time, the refrigerant R supplied from the refrigerant supply unit (not shown) is, as shown by an arrow in FIG. 7A, the pipe 26, the refrigerant introduction unit 23, the bolt refrigerant passage 22, the first refrigerant lead unit 24, the color refrigerant flow The refrigerant is discharged from the refrigerant discharge portion 30 toward the transition portion 13 of the coil 12 through the passage 32 to effectively cool the coil 12. Thereby, copper loss is suppressed.

  On the other hand, since the temperature of the stator core 11 is high in the low torque high rotation region in which iron loss is dominant, cooling the stator core 11 with the refrigerant R is effective mainly for improving the efficiency of the rotating electrical machine.

  As shown in FIGS. 8A and 8B, when the temperature of the stator core 11 becomes higher than a predetermined temperature, the temperature of the shape memory ring 43 disposed in close contact with the stator core 11 also increases. When the temperature of the shape memory ring 43 becomes equal to or higher than a predetermined temperature, the shape memory ring 43 made of a shape memory alloy undergoes a martensitic transformation to reduce its diameter in order to return to the memorized shape.

  Thus, the central portion of the shape memory ring 43 corresponding to the thickest portion t1 of the steel ring 44 and the central portion which is not easily deformed is kept in close contact with the inner peripheral surface of the refrigerant reservoir portion 41. On the other hand, the end 45 of the steel ring 44 having the smallest thickness t2 and easy to deform elastically deforms radially inward due to the diameter reduction of the shape memory ring 43 and separates from the inner circumferential surface of the refrigerant reservoir 41, The refrigerant reservoir portion 41 and the stator core refrigerant flow path 38 are communicated with each other. Therefore, the refrigerant R supplied from the refrigerant supply unit (not shown) is allowed to flow from the bolt refrigerant passage 22 to the stator core refrigerant passage 38 by the refrigerant passage adjusting unit 40 (shape memory ring 43 and steel ring 44). And flow to the stator core 11 side. As described above, by forming the refrigerant flow path adjusting unit 40 with the shape memory ring 43 and the steel material ring 44, the inlet of the stator core refrigerant flow path 38 is opened and closed in response to the temperature change.

  Therefore, as shown by arrows in FIGS. 8A and 8B, the refrigerant R supplied from the refrigerant supply unit (not shown) to the bolt refrigerant flow passage 22 is a refrigerant via the first refrigerant lead-out portion 24 and the color refrigerant flow passage 32. The refrigerant R is discharged from the discharge portion 30 toward the transition portion 13 of the coil 12 to cool the coil 12, and a part of the refrigerant R is the second refrigerant lead-out portion 25, the inner peripheral surface of the refrigerant reservoir portion 41 and the shape memory ring 43 , And is guided to the outer peripheral surface of the stator core 11 through the stator core refrigerant flow path 38, and flows along the outer peripheral surface to cool the stator core 11.

  The refrigerant R supplied to the outer peripheral surface of the stator core 11 flows along the plurality of concave and convex recessed portions formed on the outer peripheral surface of the stator core 11, and is prevented from flowing down to the side of the stator core 11. Furthermore, the refrigerant R contacts Since the surface area of the outer peripheral surface of the stator core 11 is large, the cooling can be performed effectively. In addition, cooling efficiency is improved by simultaneously cooling the stator core 11 from the inside and the outside.

  When the stator core 11 is cooled and the temperature decreases, the temperature of the shape memory ring 43 also decreases, so the shape memory ring 43 is pushed back by the elasticity of the steel material ring 44 and closely attached to the inner circumferential surface of the refrigerant reservoir portion 41. The refrigerant flow path 38 is closed. Thus, the refrigerant R is again supplied to the coil 12 to cool the transfer portion 13 of the coil 12.

  As described above, the shape memory ring 43 and the steel material ring 44 function as the refrigerant flow path adjusting unit 40 to change the refrigerant flow path according to the temperature of the stator core 11, and are supplied from the refrigerant supply portion to the bolt refrigerant flow path 22 The refrigerant R optimally cools either or both of the transition portion 13 of the coil 12 and the stator core 11 to suppress copper loss and iron loss of the stator 10 of the rotary electric machine.

Second Embodiment
Subsequently, a stator of a rotary electric machine according to a second embodiment of the present invention will be described with reference to FIGS. 9A to 11B. The stator of the rotating electrical machine according to the second embodiment differs from the stator of the rotating electrical machine according to the first embodiment in the configuration of the refrigerant flow path adjusting unit. The other components are the same as those of the first embodiment, and the same reference numerals as in the stator of the rotary electric machine of the first embodiment denote the same constituent elements. For this reason, the same or equivalent parts as those of the stator of the rotary electric machine of the first embodiment are denoted by the same reference numerals or corresponding reference numerals, and the description will be simplified or omitted.

  In the bolt through hole 19 of the stator 10 of the rotary electric machine according to the second embodiment, a refrigerant reservoir 51 having a substantially D-shaped cross section is provided downstream of the second refrigerant outlet 25 and at a position where the stator core refrigerant passage 38 opens. It is formed. The stator core refrigerant flow passage 38 opens in the opposing flat portion 51 a of the refrigerant reservoir 51.

  Inside the refrigerant reservoir 51, a shape memory ring 55 formed of a shape memory alloy and substantially U-shaped is disposed along the substantially D-shaped cross section of the refrigerant reservoir 51. The mutually facing flat portions 55 a of the shape memory ring 55 are arranged corresponding to the facing flat portions 51 a of the refrigerant reservoir 51.

  When the temperature is lower than the predetermined temperature, the shape memory ring 55 opens the flat portion 55a of the shape memory ring 55 and contacts the flat portion 51a of the refrigerant reservoir 51 to close the opening of the stator core refrigerant flow path 38 The shape is stored so that the flat portions 55a close and close to each other when the temperature is higher than.

  Further, in the bolt 18 fitted in the bolt through hole 19, a pair of radial direction holes 52 are formed penetrating so as to be opposed to the stator core refrigerant flow path 38 and orthogonal to the bolt refrigerant flow path 22. The diameter of the pair of radial holes 52 is substantially the same as the diameter of the bolt coolant channel 22.

  A pair of piston members 53 are slidably fitted in the pair of radial holes 52, and a coil spring 54 which is an elastic member is mounted between the pair of piston members 53. It is urged in the direction of projecting from the radial hole 52. The pair of piston members 53 and the coil spring 54 constitute a flow control device 50 that adjusts the flow rate of the refrigerant R flowing through the bolt refrigerant flow path 22.

  Next, the operation of the stator 10 of the rotary electric machine of the present embodiment provided with the above configuration will be described. When the stator 10 of the rotating electrical machine is used as a drive source of an electric car or the like, the copper loss is small in a region where iron loss is dominant as in high speed traveling, so the flow rate of the refrigerant R supplied to the coil 12 is reduced It is preferable to increase the flow rate of the refrigerant R supplied to the stator core 11, and reduce the flow rate of the refrigerant R supplied to the stator core 11 in a region where copper loss is dominant as in low speed travel to supply the coil 12 It is preferable to increase the flow rate of the refrigerant R.

  Specifically, as shown in FIGS. 10A and 10B, the temperature of the coil 12 is high and the temperature of the stator core 11 is in a relatively low temperature state (above a predetermined temperature) in a high torque low rotation region in which copper loss is dominant. Low). In this case, cooling the coil 12 with the refrigerant R is effective for improving the efficiency of the rotating electrical machine.

  When the stator core 11 is in a relatively low temperature state, the temperature adheres to the refrigerant reservoir portion 51 of the stator core 11 so that the temperature of the shape memory ring 55 whose temperature follows the temperature of the stator core 11 is also low, and the flat portion 55a of the shape memory ring 55 , The inlet of the stator core refrigerant flow passage 38 is closed. For this reason, the refrigerant R supplied from the refrigerant supply unit (not shown) does not flow to the stator core 11 side (the stator core refrigerant passage 38). Note that the flow to the stator core refrigerant flow path 38 does not necessarily have to be shut off, and the flow to the stator core refrigerant flow path 38 may be reduced.

  At this time, the refrigerant R supplied from the refrigerant supply unit (not shown) is, as shown by an arrow in FIG. 10A, the pipe 26, the refrigerant introduction unit 23, the bolt refrigerant passage 22, the first refrigerant lead unit 24, the color refrigerant flow The refrigerant is discharged from the refrigerant discharge portion 30 toward the transition portion 13 of the coil 12 through the passage 32 to effectively cool the coil 12.

  On the other hand, since the temperature of the stator core 11 is high in the low torque high rotation region where iron loss is dominant, cooling the stator core 11 with the refrigerant R is effective for improving the efficiency of the rotating electrical machine.

  As shown in FIGS. 11A and 11B, when the temperature of stator core 11 becomes higher than a predetermined temperature, the temperature of shape memory ring 55 in close contact with stator core 11 also increases. Then, when the temperature of the shape memory ring 55 becomes equal to or higher than a predetermined temperature, the shape memory ring 55 deforms in the direction in which the flat portions 55a approach each other in an attempt to return to the stored shape. As a result, the pair of piston members 53 is pushed into the radial hole 52 against the elastic force of the coil spring 54, and the distance L between the pair of piston members 53 is narrowed. The opening area is reduced. At the same time, the inlet of the stator core refrigerant flow path 38 closed by the flat portion 55a is opened.

  As a result, the refrigerant R supplied from the refrigerant supply unit (not shown) to the bolt refrigerant flow passage 22 passes through the first refrigerant lead-out portion 24 and the color refrigerant flow passage 32 as shown by the arrows in FIGS. 11A and 11B. The flow rate of the refrigerant R discharged from the refrigerant discharge unit 30 toward the transition portion 13 of the coil 12 to cool the coil 12 decreases. At the same time, the refrigerant R led to the outer peripheral surface of the stator core 11 through the second refrigerant lead-out portion 25, the refrigerant storage portion 51, the gap between the inner peripheral surface of the refrigerant storage portion 51 and the shape memory ring 55, and the stator core refrigerant flow path 38 Flow rate increases to cool the stator core 11.

  The refrigerant flow path adjusting unit 40 included in the stator 10 of the rotary electric machine of the present embodiment changes the refrigerant flow path according to the load condition of the rotary electric machine, and the refrigerant R supplied to the bolt refrigerant flow path 22 is The copper loss and the iron loss of the stator 10 of the rotary electric machine are effectively suppressed by supplying and cooling to the optimum portions of the transition portion 13 and the stator core 11.

  The present invention is not limited to the above-described embodiments, and appropriate modifications, improvements, and the like can be made. For example, in each of the embodiments described above, the refrigerant is supplied to the outer peripheral surface of the stator core through the stator core refrigerant flow path, but the invention is not limited to this. The refrigerant is supplied to the inside of the stator core and discharged from the inner peripheral surface or side surface of the stator core May be

  Moreover, in each embodiment mentioned above, although the refrigerant flow path adjustment part 40 was provided in the refrigerant | coolant storage part 41 formed in the opening part of the stator core refrigerant flow path 38 of the bolt through-hole 19, it does not restrict to this, It may be provided in the bolt through hole 19 or the stator core refrigerant flow path 38.

  Further, in the embodiment described above, the case of cooling the bridging portion 13 projecting from the end face 21 of the stator core 11 has been described, but in order to cool the bridging portion 13 projecting from the end face opposite to the end face 21 of the stator core 11 Another refrigerant lead-out portion communicating with the bolt refrigerant flow path 22 may be provided, and the casing 17 may be further provided with a through hole communicating with the refrigerant lead-out portion. Thus, the refrigerant R supplied from the refrigerant supply unit (not shown) is an end surface of the stator core 11 on the opposite side to the end surface 21 of the stator core 11 through the pipe 26, the refrigerant introduction unit 23, the refrigerant lead-out unit, and the through holes of the casing 17. Is discharged toward the transition part 13 of the coil 12 which protrudes from the lower end of the coil 12. Therefore, the bridging portion 13 projecting from the end face of the stator core 11 opposite to the end face 21 is also cooled.

[Summary]
The following aspects are extracted from the embodiment described above. In addition, although the corresponding element is shown in the above-mentioned embodiment in parenthesis, it is not limited to this.

(1) An annular stator core body (stator core body 15), and a stator core fixing portion (stator core fixing portion 16) provided on an outer peripheral portion of the stator core body and having a bolt through hole (bolt through hole 19) A stator core (stator core 11) having
A coil (coil 12) attached to the stator core and disposed such that a transition portion (a transition portion 13) protrudes from an end surface (end surface 21) of the stator core;
And a bolt (bolt 18) for inserting the bolt through hole and fixing the stator core to the housing (housing 17).
The stator core has a stator core refrigerant flow passage (stator core refrigerant flow passage 38) for guiding the refrigerant (refrigerant R) from the bolt through hole to the inside of the stator core or the outer peripheral surface of the stator core.
The bolt has a bolt refrigerant flow path (bolt refrigerant flow path 22),
The bolt refrigerant flow path includes a refrigerant introduction portion (a refrigerant introduction portion 23) into which the refrigerant is introduced, a first refrigerant lead-out portion (a first refrigerant lead-out portion 24) that supplies the refrigerant to the transition portion, and the stator core refrigerant flow A second refrigerant lead-out portion (second refrigerant lead-out portion 25) for supplying the refrigerant to the passage;
The stator of a rotary electric machine, wherein the bolt through hole or the stator core refrigerant flow path has a refrigerant flow path adjusting portion (refrigerant flow path adjusting portion 40) including a shape memory member (shape memory ring 43) whose shape changes with temperature.

  According to (1), the coil can be appropriately cooled by supplying the refrigerant introduced from the refrigerant introduction part to the transition part of the coil via the bolt refrigerant flow path and the first refrigerant lead-out part, and copper The loss can be reduced. In addition, by supplying the refrigerant introduced from the refrigerant introduction part to the inside of the stator core or the outer peripheral surface of the stator core through the bolt refrigerant flow path, the second refrigerant lead-out part, and the stator core refrigerant flow path, the stator core can be appropriately made. It can be cooled and iron loss can be suppressed.

  Furthermore, since the bolt through hole or the stator core refrigerant flow path has the refrigerant flow path adjustment unit including the shape memory member whose shape changes with temperature, the refrigerant flow path adjustment unit mainly supplies the refrigerant according to the temperature. The flow path can be selected.

(2) In the stator of the rotating electrical machine according to (1),
The refrigerant flow path adjustment unit
When the temperature of the stator core is equal to or lower than a predetermined temperature, the supply of the refrigerant to the stator core refrigerant flow path is shut off or reduced.
A stator of a rotating electrical machine which allows or increases the supply of refrigerant to the stator core refrigerant flow path when the temperature of the stator core is higher than a predetermined temperature.

  According to (2), since the temperature of the stator core rises in the low torque high rotation region in which iron loss is dominant, the refrigerant flow path adjusting unit permits or increases the supply of the refrigerant to the stator core refrigerant flow path Thus, the stator core can be cooled intensively. Further, in the high torque low rotation region in which the copper loss is dominant, the temperature of the stator core becomes equal to or lower than the predetermined temperature, and therefore the refrigerant flow path adjusting unit shuts off or reduces the supply of the refrigerant to the stator core refrigerant flow path. The coils can be cooled intensively.

(3) In the stator of the rotating electrical machine according to (1) or (2),
The stator of a rotary electric machine, wherein the refrigerant flow path adjustment unit has a C-shape or a U-shape and controls the supply of the refrigerant to the stator core refrigerant flow path by reducing or expanding the diameter.

  According to (3), the refrigerant flow path adjusting unit can be configured simply.

(4) In the stator of the rotary electric machine according to (3),
The refrigerant flow path adjustment unit
A shape memory ring (shape memory ring 43) formed of the shape memory member and in contact with the stator core;
A stator of a rotating electrical machine, comprising: a steel material ring (steel material ring 44) made of a steel material and disposed on an inner circumferential portion of the shape memory ring.

  According to (4), the refrigerant flow path adjusting unit can be configured by two members of a shape memory ring and a steel ring.

(5) In the stator of the rotating electrical machine according to (2),
The bolt is a flow control device (a flow control device that reduces the flow rate of the refrigerant to the first refrigerant lead-out portion when the refrigerant flow path adjustment unit allows or increases the supply of the refrigerant to the stator core refrigerant flow passage 50) A stator of a rotating electrical machine.

  According to (5), the refrigerant can be distributed and supplied to the stator core and the coil by the flow control device.

(6) In the stator of the rotating electrical machine according to (5),
The refrigerant flow path adjusting unit has a shape memory ring (shape memory ring 55) having a C shape or a U shape,
The flow rate control device includes a pair of piston members (piston members 53) disposed to intersect the bolt refrigerant flow path in the bolt, and an elastic member (coil spring 54) disposed between the pair of piston members. And, and,
In the flow rate control device, the diameter (the distance L between the piston members) between the pair of piston members is reduced by reducing the diameter of the shape memory ring of the refrigerant flow path adjusting unit, and the flow control device The stator of a rotating electrical machine that reduces the flow rate of refrigerant.

  According to (6), the refrigerant can be distributed and supplied to the stator core and the coil by the simple refrigerant flow path adjusting unit.

(7) In the stator of the rotating electrical machine according to any one of (1) to (6),
It further comprises a collar (collar 27) disposed between the bolt head of the bolt (bolt head 20) and the end face of the stator core and in which a bolt insertion hole (bolt insertion hole 28) is formed.
The color is a refrigerant discharge part (refrigerant discharge part 30) disposed to face the crossover part, and a color refrigerant flow path (color part) for communicating the first refrigerant lead-out part of the bolt and the refrigerant discharge part And a refrigerant flow path 32).

  According to (7), the refrigerant can be reliably supplied to the transfer portion by causing the color refrigerant discharge portion to face the transfer portion of the coil. Further, the amount of tightening can be appropriately set without regard to the position of the first refrigerant lead-out portion of the bolt.

(8) In the stator of the rotating electrical machine according to (7),
The stator of a rotary electric machine, wherein the collar includes an engagement portion (engagement portion 33) engaged with the end surface of the stator core.

  According to (8), by appropriately positioning the collar, the refrigerant discharge portion of the collar can be easily made to face the transition portion of the coil. Thereby, the coil can be properly cooled and copper loss can be suppressed.

10 Stator 11 of rotating electric machine Stator core 12 Coil 13 Crossing portion 14, 14A, 14B Steel plate 15 Stator core main body 16 Stator core fixing portion 17 Body 18 Bolt 19 Bolt through hole 20 Bolt head 21 End face 22 bolt refrigerant flow path 23 Refrigerant lead-out part 25 second refrigerant lead-out part 27 color 28 bolt insertion hole 30 refrigerant discharge part 32 color refrigerant flow path 33 engagement part 35 opening 36 cut out part 38 stator core refrigerant flow path 40 refrigerant flow path adjustment part 43 shape memory ring 44 Steel ring 50 Flow control device 53 Piston member 54 Coil spring (elastic member)
55 Shape memory ring L Distance between piston members R Refrigerant

Claims (8)

A stator core having an annular stator core body, and a stator core fixing portion provided on an outer peripheral portion of the stator core body and having a bolt through hole formed therein;
A coil attached to the stator core and disposed such that a transition portion projects from an end face of the stator core;
A stator of a rotary electric machine comprising: a bolt inserted into the bolt through hole and fixing the stator core to a housing;
The stator core has a stator core refrigerant flow path for guiding the refrigerant from the bolt through holes to the inside of the stator core or the outer peripheral surface of the stator core,
The bolt has a bolt refrigerant flow path,
The bolt refrigerant flow path includes a refrigerant introduction portion into which the refrigerant is introduced, a first refrigerant discharge portion supplying the refrigerant to the transfer portion, and a second refrigerant discharge portion supplying the refrigerant to the stator core refrigerant flow path. Have
The stator of a rotating electrical machine, wherein the bolt through hole or the stator core refrigerant flow path has a refrigerant flow path adjustment portion including a shape memory member whose shape changes with temperature. It is a stator of the rotary electric machine of Claim 1, Comprising:
The refrigerant flow path adjustment unit
When the temperature of the stator core is equal to or lower than a predetermined temperature, the supply of the refrigerant to the stator core refrigerant flow path is shut off or reduced.
A stator of a rotating electrical machine which allows or increases the supply of refrigerant to the stator core refrigerant flow path when the temperature of the stator core is higher than a predetermined temperature. It is a stator of the rotary electric machine of Claim 1 or 2, Comprising:
The stator of a rotary electric machine, wherein the refrigerant flow path adjustment unit has a C-shape or a U-shape and controls the supply of the refrigerant to the stator core refrigerant flow path by reducing or expanding the diameter. It is a stator of the rotary electric machine of Claim 3, Comprising:
The refrigerant flow path adjustment unit
A shape memory ring made of the shape memory member and in contact with the stator core;
A stator of a rotating electrical machine comprising: a steel material ring made of a steel material and disposed on an inner circumferential portion of the shape memory ring. It is a stator of the rotary electric machine of Claim 2, Comprising:
The bolt includes a flow control device that decreases the flow rate of the refrigerant to the first refrigerant lead portion when the refrigerant flow path adjusting unit allows or increases the supply of the refrigerant to the stator core refrigerant flow path. Electrical stator. It is a stator of the rotary electric machine of Claim 5, Comprising:
The refrigerant flow path adjusting unit has a shape memory ring having a C shape or a U shape,
The flow rate control device includes a pair of piston members disposed to intersect the bolt refrigerant flow path in the bolt, and an elastic member disposed between the pair of piston members.
The flow control device reduces the distance between the pair of piston members by reducing the diameter of the shape memory ring of the refrigerant flow path adjusting unit, thereby reducing the flow rate of the refrigerant to the first refrigerant lead-out portion. Stator of rotating electric machine. It is a stator of the rotary electric machine of any one of Claims 1-6, Comprising:
It further comprises a collar disposed between the bolt head of the bolt and the end face of the stator core and having a bolt insertion hole formed therein,
In the rotating electrical machine, the collar includes: a refrigerant discharge portion disposed to face the crossover portion; and a color refrigerant flow path communicating the first refrigerant lead-out portion of the bolt and the refrigerant discharge portion. Stator. It is a stator of the rotary electric machine of Claim 7, Comprising:
The stator of a rotating electrical machine, wherein the collar includes an engagement portion that engages with the end surface of the stator core.

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