Stator and rotating electrical machine having the same

Abstract

To provide an arrangement structure of a temperature measuring device S capable of correctly measuring the temperature of an innermost winding 52 of the windings 5, which becomes particularly hot in a high-output rotating electrical machine 1.SOLUTION: A stator 3 included in a rotary electric machine 1 includes an annular stator body 31, a plurality of windings 5 inserted into slots 8 of the stator body 31 and wound in a distributed manner, and a temperature measuring device S that measures the temperature of the winding 5 by being in contact with the winding 5, and the temperature measuring device S is in contact with one of the innermost windings 52 of the windings 5 protruding from the stator body 31 on one axial side of the stator body 31.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a stator including an annular stator body, a plurality of windings inserted into slots of the stator body and distributed wound, and a temperature measuring device for measuring the temperature of the windings, and a rotating electrical machine including the stator, and particularly relates to an arrangement structure of the temperature measuring device in the stator of a rotating electrical machine preferably used as an in-vehicle rotating electrical machine.

Background Art

[0002] In an in-vehicle rotating electrical machine, when an electric current flows through the windings of the stator, the windings generate heat and the temperature of the stator rises. If the stator rises above a predetermined temperature, some of the components constituting the stator may be damaged by heat. Therefore, as disclosed in Patent Document 1, it is known to install a temperature detection element in the stator to detect the temperature of the stator.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In what is disclosed in the above Patent Document 1, since the temperature detection element is arranged in the space between the winding on the outermost periphery of one slot of the stator and the wall surface at the radially outer end of the slot via a wedge or insulating resin, not only the temperature of the innermost winding, which becomes particularly high in a high-output rotating electrical machine, cannot be measured, but also the temperature measurement is not accurate because the temperature detection element does not directly contact the winding. Moreover, since the temperature detection element is arranged inside the slot of the stator, it is inevitable that noise enters the signal line.

[0005] Therefore, the present invention provides a high-output rotating electrical machine having a plurality of windings inserted into slots of a stator and distributed wound. In particular, it can accurately measure the temperature of the innermost winding among the windings, which becomes particularly hot. By directly contacting the winding, the temperature measurement becomes accurate. Furthermore, by arranging a temperature detection element at a portion protruding from the stator body of the winding, it aims to provide an arrangement structure of a temperature measuring device in which no noise enters the signal line.

Means for Solving the Problems

[0006] To achieve the above object, the present invention provides a stator included in a rotating electrical machine, which includes an annular stator body, a plurality of windings inserted into slots of the stator body and distributed wound, and a temperature measuring device that measures the temperature of the winding by contacting the winding. The temperature measuring device is in contact with one of the innermost windings of the windings protruding from the stator body on one side in the axial direction of the stator body. , front An end plate for protecting the stator body is provided on the stator body. The end plate has a convex portion that protrudes in the axial direction and supports the winding. has The convex portion arranged at a position facing the temperature measuring device with the one winding interposed therebetween supports the one winding from the opposite side of the temperature measuring device, which is the first feature.

[0007] In addition to the first feature, the present invention further includes a restraining member that holds the temperature measuring device against the one winding. The temperature measuring device contacts the one winding by the restraining member, which is the second feature.

[0008] Furthermore, the present invention the first or In addition to the second feature, each of the windings is formed by inserting both leg portions of a plurality of U-shaped segments constituting the winding into two slots of the stator body from one side in the axial direction, and joining the tips of both leg portions of each segment protruding from the other side in the axial direction to the tips of the leg portions of another segment, respectively. In the middle portion of each segment that protrudes from one side in the axial direction and connects the bases of both leg portions, a bent portion is formed by bending the base of each of the leg portions protruding from the stator body toward the other base, and the bent portion is in contact with the tip portion of the convex portion protruding outward. This is the third feature.

[0009] In addition, the present invention, in addition to the first or second feature, The end plate is on both axial sides of the stator body is provided, and the end plate is provided at a position corresponding to the slot of the stator body and has a slot into which the winding is inserted and a temperature measuring device insertion portion formed in a part of the slot into which the temperature measuring device is inserted. This is the 4 feature.

[0010] In addition, the present invention, in addition to the the first or second feature, the winding on the other side in the axial direction protruding from the stator body has an inclined portion that extends inclined toward the winding adjacent in the circumferential direction, and an inclined surface that inclines in the same direction as the inclined portion is formed at the tip portion of the convex portion protruding from the end plate on the other side in the axial direction. This is the fifth feature.

[0011] In addition, the present invention is a rotating electrical machine including a stator having any one of the features from the first to the 5 features, and includes a cooling path through which a coolant for cooling the winding flows and a droplet portion for dropping the coolant onto the winding. When the axis of the stator is arranged in a direction perpendicular to the gravitational direction, the droplet portion is arranged above the housing stator, and the coolant dropped from the droplet portion is the housing It is made to accumulate in a coolant reservoir portion arranged below, and the temperature measuring device is arranged at a position between the droplet portion and the coolant reservoir portion in the gravitational direction, as the 6 feature of the

[0012] Further, in addition to the features of the 6 present invention, the housing accommodates the stator and a rotor arranged inside the stator, both leg portions of a plurality of U-shaped segments constituting the winding are joined to leg portions of different segments on the other axial side of the stator, the temperature measuring device is arranged on one axial side of the stator, and a through hole for extending a cable of the temperature measuring device to the outside is formed on one axial side of the housing, as the 7 feature of the

[0013] Note that the thermistor S of the embodiment corresponds to the temperature measuring device of the present invention.

Advantages of the Invention

[0014] According to the first feature of the present invention, since the temperature measuring device is in contact with one of the innermost windings of the windings protruding from the stator body on one axial side of the stator body, the temperature of the innermost winding of the windings, which becomes particularly high in a high-output rotating electric machine, can be accurately measured by the temperature measuring device in contact with the winding. Moreover, since the temperature detection element is arranged at a portion of the winding protruding from the stator body, noise can be prevented from entering the signal line, and thus the accuracy of temperature measurement is improved from that viewpoint. Moreover , s an end plate for protecting the stator body is provided on the stator body, and the end plate has a convex portion protruding in the axial direction to support the winding has and the convex portion arranged at a position facing the temperature measuring device with the one winding interposed therebetween supports the one winding from the opposite side of the temperature measuring device, so that the one winding with which the temperature measuring device is in contact can be stably supported, and the accuracy of temperature measurement can be surely ensured. Moreover, since this convex portion is formed on the end plate, such a convex portion can be easily formed.

[0015] According to the second feature of the present invention, a restraint member for holding the temperature measuring device on the one winding is provided. Since the temperature measuring device abuts against the one winding by the restraint member, the contact area between the temperature measuring device and the one winding can be stably ensured, and the accuracy of temperature measurement can be ensured.

[0016] Also, according to the 3 feature of the present invention, each of the windings is configured by inserting both legs of a plurality of U-shaped segments constituting the winding into two slots of the stator body from one side in the axial direction, and joining the tips of both legs of each segment protruding from the other side in the axial direction to the tips of the legs of another segment. Therefore, when inserting both legs of the segment into the slots, it is difficult to determine the height position of the middle part of each segment protruding from one side in the axial direction of the stator body to be the same. However, during the insertion, the bent part formed in the middle part of each segment abuts against the tip part of the convex part protruding from the stator body, restricting further insertion of both legs into the slots. Thus, the height position of the middle part of the segment during the insertion can be determined to be the same. Moreover, since the winding does not penetrate further into the slots, the length of the winding supported by the convex part from the opposite side of the temperature measuring device can also be ensured, so that the accuracy of temperature measurement can be improved.

[0017] Also, according to the 4According to the features, end plates having slots for inserting windings at positions corresponding to the slots of the stator body are provided on both sides of the stator body, so that the stator body can be protected from both axial sides by the end plates. Moreover, since a temperature sensor insertion portion for inserting a temperature sensor is formed in a part of the slots of the end plates, by inserting the temperature sensor into the temperature sensor insertion portion, the mounting position of the temperature sensor can be secured at a position outside the inner end of the coil end. Therefore, even if the temperature sensor is brought into contact with the innermost winding, the temperature sensor does not protrude inside the stator, and not only does the temperature sensor not become an obstacle when the rotor is inserted inside the stator, but also, when it is inserted into the temperature sensor insertion portion, the positional relationship between the temperature sensor and the winding is uniquely determined and the temperature of the winding can be measured more stably, and moreover, the failure of the temperature sensor is less likely to occur.

[0018] Also, according to the 5 features of the present invention, even if the winding on the other axial side protruding from the stator body has an inclined portion that extends obliquely toward the winding adjacent in the circumferential direction, an inclined surface that inclines in the same direction as the inclined portion is formed at the tip of the convex portion protruding from the end plate on the other axial side, so that the inclined winding and the convex portion do not interfere with each other. Therefore, the convex portions of the end plates provided on both sides of the stator body can be made common, so that the end plates on both sides can be formed as a common end plate, and the windings protruding from the other direction side of the stator body can also be stably supported.

[0019] Also, according to the 6 features of the present invention, a rotating electrical machine including a stator having any of the features of the first to seventh features includes a cooling path through which a coolant for cooling the winding flows and in which a droplet portion for dropping the coolant onto the winding is formed. When the axis of the stator is arranged in a direction perpendicular to the gravitational direction, the droplet portion is arranged housing above the housing It is arranged to collect in a coolant reservoir section disposed below, and since the temperature measuring device is disposed at a position between the droplet section and the coolant reservoir section in the direction of gravity, the position of the temperature measuring device can be separated from both the droplet section and the coolant reservoir section. Therefore, the influence of the coolant on the temperature measuring device can be excluded as much as possible, and the temperature of the winding can be measured with higher accuracy.

[0020] Also, according to the 7 feature of the present invention, the housing of the rotating electrical machine houses a stator and a rotor disposed inside the stator, both leg portions of a plurality of U-shaped segments constituting the winding are joined to the leg portions of different segments on the other side in the axial direction of the stator, the temperature measuring device is disposed on one side in the axial direction of the stator, and a through hole for extending the cable of the temperature measuring device to the outside is formed on one side in the axial direction of the housing. Therefore, the distance from the temperature measuring device to the end face of the housing can be shortened and the length of the cable can also be shortened, so the risk of disconnection of the cable or the like can be reduced.

Brief Description of the Drawings

[0021] [Figure 1] FIG. 1 is a cross-sectional view taken along the axial direction of a rotating electrical machine according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1 schematically showing a winding portion. [Figure 3] FIG. 3 is a perspective view of a stator body and an end plate of a stator according to the first embodiment. [Figure 4] FIG. 4 is a plan view showing the arrangement of leg portions of a plurality of segments laminated and aligned in one slot. [Figure 5] FIG. 5 is a perspective view of a part of slots and segments inserted into the slots. [Figure 6] FIG. 6 is a diagram showing a specific form of winding of a phase winding constituting a U1 phase. FIG. 6(A) is a view of the slot of the stator body 4 seen from the side opposite to the lid of the housing (one side in the axial direction), and FIG. 6(B) is a view of the slot of the stator body 4 seen from the lid side of the housing (the other side in the axial direction). [Figure 7] FIG. 7 is a diagram showing a specific form of winding of the phase winding constituting the U2 phase, and FIGS. 7(A) and 7(B) are the same diagrams as FIGS. 6(A) and 6(B). [Figure 8] FIG. 8 is a perspective view of the stator schematically showing the winding portion as viewed from the inside of one direction side of the stator body. [Figure 9] FIG. 9 is an enlarged view taken along arrow 9 in FIG. 8. [Figure 10] FIG. 10 is an enlarged view of the winding when the stator of FIG. 8 is viewed from the inside of the other direction side of the stator body. [Figure 11] FIG. 11 is an enlarged view taken along arrow 11 in FIG. 3. [Figure 12] FIG. 12 is a corresponding diagram to FIG. 9 showing the second embodiment of the present invention.

MODE FOR CARRYING OUT THE INVENTION

[0022] Embodiments of the present invention will be described below with reference to the accompanying drawings. First Embodiment

[0023] The stator and the rotating electrical machine of the present embodiment are particularly suitable for use in an in-vehicle rotating electrical machine. The rotating electrical machine 1 has, as shown in FIG. 1, a housing 2 having a bottomed cylindrical housing body 21 and a lid body 22 covering the opening of the housing body 21, a cylindrical stator 3 fixed inside the housing 2, and a rotor 4 disposed on the inner peripheral side of the stator 3 facing the stator 3 and rotatably supported by the housing 2 via a rotating shaft 41.

[0024] Also referring to FIG. 2, the housing body 21 of the rotating electrical machine 1 is provided with a cooling passage 6 for supplying a coolant for cooling the stator body 31 of the stator 3 and the winding 5 wound around the stator body 31. This cooling passage 6 introduces the coolant introduced into the housing 2 from an inlet (not shown) formed on the lid body 22 side of the housing 2, and in a state where the axis of the stator 3 is arranged in a direction perpendicular to the gravitational direction, from a pair of left and right pipe members 61, 62 arranged in parallel with the axis of the stator 3 at the upper part of the stator 3, it drips onto the coil ends 51 of each winding 5 and the outer peripheral surface 32 of the stator body 31 as indicated by arrow A. The coolant dripping from the droplet portions 63 of these pipe members 61, 62 accumulates in a coolant reservoir portion 7 arranged below the housing body 21 so as to immerse a part of the wound winding 5, and the coolant exceeding a certain amount is discharged outside the housing 2 from a drain port 71 formed on the lid body 22 side of the housing 2. In FIG. 2, the position indicated by reference numeral S' shows the position where a thermistor S to be described later is arranged at a portion on the opposite side of the stator body 31 facing this position.

[0025] The rotor 4 rotatably supported by the housing 2 has a plurality of permanent magnets (not shown) arranged along a cylindrical outer peripheral surface facing the inner peripheral surface of the stator 3. Also, the stator 3 formed in a cylindrical shape so as to surround the rotor 4 is composed of a stator body 31 formed by laminating a plurality of thin electromagnetic steel sheets 33 and fixed with a plurality of long bolts 34, and a winding 5 wound around slots (to be described later) of the stator body 31. The stator body 31 is fixed in the housing body 21 by fixing means (not shown).

[0026] As shown in FIG. 3, a plurality of slots 81 into which the winding 5 is inserted are formed in the cylindrical stator body 31 at equal intervals in the circumferential direction. On both axial sides of the stator body 31 (the upper and lower sides in FIG. 3), end plates 9 made of synthetic resin having slots 82 formed at the same positions as the slots 81 of the stator body 31 are closely arranged on the stator body 31 so as to protect the stator body 31 from both axial sides.

[0027] In this embodiment, 48 sets of such slot pairs 81 and 82 are formed. In each set of slots 81 and 82, legs 10a and 10b of a plurality of segments described later that constitute winding 5 are divided into eight layers from the innermost layer L1 to the outermost layer L8 in the radial direction of stator body 31 via insulator 11, laminated, aligned, and accommodated as shown in FIG. 4. However, the number of slots and the number of layers of winding 5 accommodated in each slot are not limited to this. Since these slots 81 and 82 cooperate to form one slot 8, in the following description, unless it is necessary to distinguish between slots 81 and 82, they are collectively referred to simply as "slot 8". When distinguishing each of these slots 8 arranged in the circumferential direction of stator body 31 one by one, they are referred to as the first slot to the 48th slot in order clockwise from an arbitrary slot 8. Also, since end plate 9 is not necessarily required, among the slots referred to as slot 8 in the following description, there are those that are composed only of slot 81 without slot 82.

[0028] As shown in FIG. 5, each segment 10 that constitutes winding 5 has left and right legs 10a and 10b that are inserted into two slots 8 of stator body 31 that are spaced apart from each other from one side in the axial direction of stator body 31 (in this embodiment, the opposite side of cover 2 in FIG. 1), and an intermediate portion 10c that protrudes from the one side in the axial direction of stator body 31 so as to connect between bases 10a1 and 10b1 of these left and right legs 10a and 10b. Each segment 10 is formed by a U-shaped flat angle wire. Except for tips 10a3 and 10b3 of tips 10a2 and 10b2 of both legs 10a and 10b that protrude from the other side in the axial direction of the slot 8 when inserted into the slot 8, it is covered with an insulating film 10d (see FIG. 4). 2

[0029] ​The middle part 10c of each segment 10 is provided with a plurality of lengths corresponding to the mounting positions of the respective segments 10 for inserting the leg portions 10a and 10b into two slots 8 spaced apart with several slots 8 in between. At the connection portions of each middle part 10c with the respective base portions 10a1 and 10b1, bending portions 10e are formed which bend the respective base portions 10a1 and 10b1 towards the other base portions 10b1 and 10a1. Also, at the middle position of each middle part 10c, a crank portion 10f is formed for inserting the leg portions 10a and 10b into two layers with different alignment orders of the two slots 8.

[0030] After the leg portions 10a and 10b of such a plurality of segments 10 are respectively inserted into specific layers of specific slots 8 predetermined from one side in the axial direction of the stator body 31, except for a part of the leg portions 10a and 10b inserted into the innermost circumferential side or outermost circumferential side layer, both tip portions 10a2 and 10b2 protruding from the other side in the axial direction of the stator body 31 are bent in a direction approaching each other, and the tip of one of the bent tip portions is arranged at the same position and joined to the tip of the other tip portion of another segment 10 adjacent in the radial direction by welding or the like so as to be electrically conductive. By these segments 10 being connected in series to form one winding 5, a phase winding of one of the distributed windings of the U-phase, V-phase, and W-phase is constituted.

[0031] In this embodiment, such a plurality of segments 10 are used to form 48 slots arranged in the circumferential direction of the stator body 31 8 Among them, two sets of phase windings of the U1-phase and U2-phase constituting the U-phase are wound around the first and second slots, the seventh and eighth slots, the thirteenth and fourteenth slots, the nineteenth and twentieth slots, and the twenty-fifth and twenty-sixth slots. Also, two sets of phase windings of the U3-phase and U4-phase constituting the U-phase are wound around the twenty-fifth and twenty-sixth slots, the thirty-first and thirty-second slots, the thirty-seventh and thirty-eighth slots, the forty-third and forty-fourth slots, and the first and second slots.

[0032] FIG. 6 is a diagram showing a specific mode of winding of the phase windings constituting the U1 phase. FIG. 6(A) shows the wiring state on the intermediate portion 10c side of the segment 10 inserted from one axial side of the stator body 31, and FIG. 6(B) shows the wiring state of the tips 10a2, 10b2 of the legs 10a, 10b of the segment 10 protruding from the other axial side of the stator body 31. Also, in both figures, the horizontal numbers represent the slot numbers, and the vertical numbers L1 to L8 represent the numbers of the eight layers of that slot. Further, the alphabets above the slot numbers represent the phases of the windings inserted into the slots. Specifically, windings of the U layer are inserted into the first, second slots, etc., windings of the V layer are inserted into the third, fourth slots, etc., and windings of the W layer are inserted into the fifth, sixth slots, etc. Note that 、 In FIGS. 6 and FIG. 7 showing the mode of winding of the phase windings of the U2 phase, since it is necessary to distinguish and call each of the segments 10 inserted into each of the layers L1 to L8 of each of the slots 8 arranged in the circumferential direction of the stator body 31 one by one, in FIGS. 6 and 7, the segments constituting the U1 phase are called the first, second, third... segments in order, and both legs of the first segment are called 1a, 1b, and similarly, both legs of the second, third... segments are called 2a, 2b; 3a, 3b... respectively.

[0033] In FIG. 6(A), 1a, 1b; 2a, 2b... respectively indicate the proximal ends of both legs of the first segment, second segment... protruding from the slots, and the lines connecting 1a, 1b; 2a, 2b... respectively indicate the intermediate portions of the first segment, second segment... Further, in FIG. 6(B), 1a′, 1b′; 2a′, 2b′... indicate the protruding ends of both legs of the first segment, second segment... protruding from the slots, and the lines extending from 1a′, 1b′; 2a′, 2b′... respectively represent the tips of the first segment, second segment... bent at the protruding ends. Also, in FIG. 6(B), the blackened portions at the tips of those lines respectively represent the locations where the tips of the two tips are conductively joined.

[0034] As shown in Fig. 6(A), from one axial side of the stator body 4 (the side opposite to the lid body 2b in Fig. 1), the legs 1a, 1b of the first segment constituting the U1 phase are inserted into the eighth layer of the second slot and the eighth layer of the seventh slot. Similarly, the legs 2a, 2b; 3a, 3b; 4a, 4b of the second, third, and fourth segments constituting the U1 phase are inserted into the seventh, fifth, and third layers of the second slot and the sixth, fourth, and second layers of the seventh slot, respectively. Similarly, after the legs 5a, 5b of the fifth segment constituting the U1 phase are inserted into the first layer of the second slot and the first layer of the eighth slot, as shown in Fig. 6(B), on the other axial side of the stator body 4 (the lid body 2b side in Fig. 1), one tip 1a' of the first segment is bent to the opposite side of the other tip 1b', and its tip is connected to the input terminal of the U phase. At the same time, the other tip 1b' of the first segment and one tip 2a' of the second segment, the other tip 2b' of the second segment and one tip 3a' of the third segment, the other tip 3b' of the third segment and one tip 4a' of the fourth segment, the other tip 4b' of the fourth segment and one tip 5a' of the fifth segment are bent toward the approaching side, respectively, and their tips are joined to each other so as to be energizable. Also, the tip 5b' of the fifth segment is bent to the opposite side of the tip 5a', and its tip is joined to the tip of the tip 6b' of the leg 6b of the sixth segment inserted into the third layer of the eighth slot and the second layer of the fourteenth slot from one axial side of the stator body 4 so as to be energizable. Similarly, up to the sixteenth segment, the tips of the tips of the legs of the segments with consecutive numbers are joined to each other so as to be energizable, and the tip of one tip 16a' of the sixteenth segment is connected to the neutral point of the U1 phase (not shown), thereby forming the phase winding of the U1 phase.

[0035] The winding mode of the phase winding constituting the U2 phase is as shown in Figs. 7(A) and 7(B). However, its mode is the same as that of the U1 phase shown in Figs. 6(A) and 6(B) except that the tip of one tip 16a' of the sixteenth segment is connected to the neutral point of the U2 phase (not shown), so no further explanation is given. Also, the two sets of phase windings of the U3 phase and U4 phase are the same as those of the U1 phase and U2 phase, so these explanations are also omitted.

[0036] Also, in the throttle valve series such as the 9th and 10th slots, the 15th and 16th slots, etc. that start from the 3rd and 4th slots and are consecutive every five slots, the phase windings V1 to V4 that constitute the V phase are wound in the same manner. In the throttle valve series such as the 11th and 12th slots, the 15th and 16th slots, etc. that start from the 5th and 6th slots and are consecutive every five slots, the phase windings W1 to W4 that constitute the W phase are wound in the same manner. And the respective ends of U1, V1, W1, the respective ends of U2, V2, W2, the respective ends of U3, V3, W3, and the respective ends of U4, V4, W4 among these are connected at the neutral point, and three-phase alternating current U-phase windings, V-phase windings, and W-phase windings are formed by being distributed and wound in four columns in parallel. phase Three-phase alternating current U-phase windings, V-phase windings, and W-phase windings are formed.

[0037] Now, in the present embodiment, in a state where the axis of the stator 3 is arranged in a direction perpendicular to the gravitational direction as shown in FIG. 1, on the side of the stator main body 31 opposite to the lid body 22 of the housing 2, at a position between the droplet portion 63 and the coolant reservoir portion 7 in the gravitational direction, that is, on one axial side of the stator main body 31, at a position opposite to the position indicated by the reference symbol S' in FIG. 2, a thermistor S as a temperature measuring device is provided.

[0038] As shown in FIG. 8, which is a perspective view of the stator 3 seen from one direction side of the stator main body 31, the thermistor S is on one axial side of the stator main body 31, which is the insertion side of each segment 10. diameter It is attached to the innermost peripheral part of the direction, and a cable 12 extending from the thermistor S extends outside the housing 2 through a through hole (not shown) formed in the housing 2. Further, as shown in FIG. 9 which is an enlarged view taken along arrow 9 in FIG. 8, the thermistor S is in contact with one of the innermost peripheral windings 52 of the windings 5 protruding from the stator body 31 on one axial side of the stator body 31 which is the insertion side of each segment 10, and is fixed by a heat-shrinkable tube 13 which is a restraining member to the protruding portion of the innermost peripheral winding 52 from the stator body. At that time, in order to prevent the end plate 9 from interfering with the thermistor S, a thermistor insertion portion 83 for inserting the thermistor S as shown in FIG. 11 which is an enlarged view taken along arrow 11 in FIG. 3 is formed by notching the slot 82 in the slot 82 of the end plate 9 where the thermistor S is attached.

[0039] In this embodiment, since the segment 10 formed of a U-shaped flat wire is used as the winding 5 , the most Insert the heat-shrinkable tube 13 from the tip 10a2 of the leg portion 10a of the segment 10 corresponding to the inner peripheral winding 52, fix the thermistor S to the heat-shrinkable tube 13, and insert the segment 10 into the slot 8 in which the thermistor insertion portion 83 is formed, and it is possible to easily form the winding 5 with the thermistor S fixed to one of the innermost peripheral windings 52. Moreover, in this embodiment, since the shape of the thermistor S is a rectangular parallelepiped and not a cylindrical shape, the flat wire winding 52 and the plane are in contact with each other, and a stable contact area can be ensured. Note that the shape of the thermistor S is not particularly limited to a rectangular parallelepiped, but it is desirable that the cross section is rectangular.

[0040] As shown in FIG. 3, in the slot 82 of the end plate 9 diameter On the outer surface of the innermost circumference side of the direction, a plurality of convex portions 91 are formed. One of these convex portions 91 protrudes to a position facing the thermistor S with one winding 52 of the innermost circumference interposed therebetween, and by supporting the winding 52 from the opposite side of the thermistor S as shown in FIG. 9, the winding 52 with which the thermistor S abuts can be stably supported. Further, when each segment 10 is inserted into the slot 6, the tip portion 92 of this convex portion 91 abuts against the bent portion 10e formed in the intermediate portion 10c of each segment 10, so that the height position of the intermediate portion 10c of the segment 10 at the time of insertion can be determined to be uniform.

[0041] Moreover, as shown in FIG. 10 which is an enlarged view of the winding 5 when the stator 3 of FIG. 8 is viewed from the other direction side of the stator body 31, even when the end plate 9 is disposed on the other axial direction side of the stator body, on the tip portion 92 of this convex portion 91, part an inclined surface 93 is formed which is inclined in the same direction as the inclination 53 of the tip portions 10a2, 10b2 of each segment 10 that are bent on the other axial direction side of the stator body 31. Therefore, the tip portion 92 of the convex portion 91 protruding from the end plate 9 does not interfere with the winding 5 on the other axial direction side that protrudes from the stator body 31 and is inclined in one direction, and the winding 5 protruding from the other direction side of the stator body 31 can also be stably supported by this convex portion 91.

[0042] Note that, as described above, the end plate 9 is not necessarily required and can be omitted. However, when the end plate 9 is omitted, it is also possible to form the convex portion 91 on the outermost layer of the electromagnetic steel plate 33 constituting the stator body 31. Also, regardless of whether the end plate 9 is used or not, it is possible to omit the convex portion 91. Needless to say, when the end plate 9 is not used, the thermistor insertion portion 83 described above is not required.

[0043] Next, the operation of the first embodiment of the present invention having the above configuration will be described.

[0044] In this embodiment, the thermistor S abuts against one of the innermost windings 52 of the windings 5 protruding from the stator main body 31 on one axial side of the stator main body 31, which is the insertion side of each segment 10, and is fixed by a heat-shrinkable tube 13, which is a restraining member, to the protruding portion of the innermost winding 52 from the stator main body 31. Therefore, in the high-output rotating electric machine 1, the temperature of the innermost winding 52 of the windings 5, which becomes particularly high, can be accurately measured by the thermistor S that stably secures the contact area with the windings 5 by abutting against the windings 5. Moreover, since this thermistor S is arranged at the portion of the windings 5 protruding from the stator main body 31, it is possible to prevent noise from entering the signal line and improve the measurement accuracy of temperature measurement.

[0045] End plates 9 made of synthetic resin, in which slots 82 are formed at the same positions as the slots 81 of the stator main body 31, are arranged so as to be in close contact with the stator main body 31 on both axial sides of the stator main body 31, so that the stator main body 31 can be protected from both axial sides. Moreover, since a thermistor insertion portion 83 for inserting the thermistor S is formed by notching the slot 82 in this end plate 9, by attaching the thermistor S to the thermistor insertion portion 83, the mounting position of the thermistor S can be secured outside the inner end of the coil end (the inner end of the innermost winding 5 in the radial direction). Therefore, even when the thermistor S is abutted against the innermost winding 52, the thermistor S does not protrude inside the stator 3, and the thermistor S does not become an obstacle when the rotor 4 is inserted inside the stator 3. In addition, when the thermistor S is inserted into the thermistor insertion portion 83, the positional relationship between the thermistor S and the winding 52 is uniquely determined, and the thermistor S is less likely to fail.

[0046] Moreover, the end plate 9's diameter On the outer surface of the innermost periphery in the direction, a plurality of convex portions 91 are formed. The convex portions 91 protrude in the axial direction of the stator main body 31 to support the winding 5, and the convex portion 91 disposed at a position facing the thermistor S with the winding 52 in contact with the thermistor S interposed therebetween supports the winding 52 from the opposite side of the thermistor S. Therefore, the winding 52 in contact with the thermistor S can be stably supported, and the accuracy of temperature measurement can be surely ensured. Moreover, since this convex portion 91 is formed on the end plate 9, it can be easily formed.

[0047] Also, each of the windings 5 is configured by inserting both leg portions 10a, 10b of a plurality of U-shaped segments 10 constituting the winding 5 into two slots 8 of the stator main body 31 from one side in the axial direction, and joining the tips 10a3, 10b3 of both leg portions 10a, 10b of each segment 10 protruding from the other side in the axial direction to the tips 10a3, 10b3 of the leg portions 10a, 10b of another segment respectively. Therefore, the high-output rotating electrical machine 1 can be easily manufactured. At that time, when inserting both leg portions 10a, 10b of the segment into the slot 8, it is difficult to determine the height position of the intermediate portion 10c of each segment 10 protruding from one side in the axial direction of the stator main body 31 to be the same. However, when inserting the leg portions 10a, 10b of the segment 10, the bent portion 10e formed in the intermediate portion 10c of each segment 10 abuts against the tip portion 92 of the convex portion 91 protruding from the stator main body 31, restricting further insertion of both leg portions 10a, 10b into the slot 8. Therefore, the height position of the intermediate portion 10c of the segment 10 at the time of insertion can be determined to be the same. Moreover, since the winding 5 does not penetrate further into the slot 8, the length of the winding 52 supported by the convex portion 91 from the opposite side of the thermistor S can be ensured, and the accuracy of temperature measurement can be improved.

[0048] Since the tips 10a2 and 10b2 of both legs 10a and 10b of the U-shaped segment 10 protruding from the other axial side of the slot 8 are bent in a direction approaching each other, the winding 5 on the other axial side of the stator body 31 has an inclined portion 53 that extends obliquely toward the winding 5 adjacent in the circumferential direction. However, on the tip 92 of the convex portion 91 protruding from the end plate 9 on the other axial side, an inclined surface 93 that inclines in the same direction as the inclined portion 53 is formed, so that the inclined winding 5 and the convex portion 91 do not interfere with each other. Therefore, the convex portions 91 of the end plates 9 provided on both sides of the stator body 31 can be made common, so that the end plates 9 on both sides can be formed as a common end plate 9, and the winding 5 protruding from the other direction side of the stator body 31 can also be stably supported.

[0049] Further, in the housing 2 that houses the stator 3 and the rotor 4, a cooling passage 6 is formed through which a coolant that cools the winding 5 flows and a droplet portion 63 that droplets the coolant onto the winding 5 is formed. When the axis of the stator 3 is arranged in a direction perpendicular to the gravitational direction, the droplet portion 63 surrounds the stator 3. housing It is arranged above 2 of the thermistor S, and the thermistor S is arranged at a position between the droplet portion 63 and the coolant reservoir portion 7 where the coolant droplet from the droplet portion 63 accumulates in the gravitational direction. Therefore, the position of the thermistor S can be separated from both the droplet portion 63 and the coolant reservoir portion 7, and the influence of the coolant on the thermistor S can be eliminated as much as possible.

[0050] Furthermore, on one axial side of the stator 3 where the thermistor S is arranged, a through hole (not shown) for extending the cable 12 of the thermistor S to the outside is formed in the housing 2. Therefore, the distance from the thermistor S to the end face of the housing 2 can be shortened and the length of the cable 12 can also be shortened, thereby reducing the risk of disconnection of the cable 12 and the like. Second Embodiment

[0051] Next, a second embodiment of the present invention will be described based on FIG. 12, which is a corresponding diagram to FIG. 9 of the first embodiment. In the first embodiment, the winding 52 is supported by the convex portion 91 disposed at a position opposite to the thermistor S of the winding 52 with which the thermistor S abuts. However, the second embodiment differs from the first embodiment only in that the winding 52 with which the thermistor S abuts is not supported by the convex portion 91. Even in this case, since the thermistor S is surely fixed to the winding 52 by the heat-shrinkable tube 13 which is a restraining member, the thermistor S can be stably supported on the winding 52.

[0052] Although the first and second embodiments of the present invention have been described above, various design changes can be made without departing from the gist of the present invention.

[0053] For example, in the first and second embodiments, the winding 5 is formed of a flat wire, but it may be formed of a round wire. Also, the thermistor S may be brought into contact with the winding 52 on the side where each segment is joined so as to be energizable. Further, the temperature measuring device is not particularly limited to the thermistor S, and various temperature sensors can be used. Also, the restraining member for holding the thermistor S on the winding 52 is not particularly limited to the heat-shrinkable tube 13, and various members such as a rubber ring, a binding band, and a clip can be used. Furthermore, the end plate 9 can be omitted as described above.

Explanation of Reference Numerals

[0054] 1 ··· Rotating electrical machine 2 ··· Housing 3 ··· Stator 31 ··· Stator body 4 ··· Rotor 5 ··· Winding 52 ··· One of the innermost windings 53 ··· Inclined portion 6 ··· Cooling channel 63 ··· Droplet portion 7 ··· Coolant reservoir portion 8 ··· Slot 81 ··· Slot of stator body 82 ··· End plate slot 83 ··· Temperature measuring device insertion part 9 ··· End plate 91 ··· Convex part 92 ··· Tip 93 ··· Inclined surface 10 ··· Segment 10a, 10b ··· Both legs 10a1, 10b1 ··· Base 10a3, 10b3 ··· Tip 10c ··· Intermediate part 10e ··· Bending part 12 ··· Cable 13... heat-shrinkable tube (constraint member) S ··· Temperature measuring device

Claims

1. A stator included in a rotating electrical machine, comprising: An annular stator body; A plurality of windings inserted into slots of the stator body and wound in a distributed manner; A temperature measuring device that measures the temperature of the winding by contacting the winding; The temperature measuring device is in contact with one of the innermost windings protruding from the stator body on one axial side of the stator body; An end plate for protecting the stator body is provided on the stator body; The end plate has a convex portion that protrudes in the axial direction and supports the winding; The convex portion disposed at a position facing the temperature measuring device with the one winding interposed therebetween supports the one winding from the opposite side of the temperature measuring device. A stator characterized by this.

2. The stator according to claim 1, further comprising: A restraining member that holds the temperature measuring device in contact with the one winding; The temperature measuring device is in contact with the one winding by the restraining member. A stator characterized by this.

3. The stator according to claim 1 or claim 2, further comprising: Each of the windings is formed by inserting both legs of a plurality of U-shaped segments constituting the winding into two slots of the stator body from one axial side, and joining the tips of both legs of each segment protruding from the other axial side to the tips of the legs of another segment. A bent portion is formed in the middle portion of each segment that protrudes from one axial side and connects the bases of both legs, and the bent portion bends the base of each of the both legs protruding from the stator body toward the other base, and the bent portion is in contact with the tip of the convex portion protruding outward. A stator characterized by this.

4. The stator according to claim 1 or claim 2, further comprising: The end plate is provided on both axial sides of the stator body, and the end plate has a slot provided at a position corresponding to the slot of the stator body for inserting the winding, and a temperature measuring device insertion portion formed in a part of the slot for inserting the temperature measuring device. A stator characterized by this.

5. The stator according to claim 1 or claim 2, further comprising: The winding on the other axial side protruding from the stator body includes an inclined portion that extends inclined toward the winding adjacent in the circumferential direction, and a tip portion of the convex portion protruding from the end plate on the other axial side has an inclined surface inclined in the same direction as the inclined portion. A stator characterized by this.

6. A rotating electrical machine comprising the stator according to any one of Claims 1 to 5, comprising a cooling passage through which a coolant for cooling the winding flows and in which a droplet portion for dropping the coolant onto the winding is formed, when the axis of the stator is arranged in a direction perpendicular to the gravitational direction, the droplet portion is arranged at the upper part of the housing surrounding the stator, and the coolant dropped from the droplet portion accumulates in a coolant reservoir portion arranged below the housing, The temperature measuring device is arranged at a position between the droplet portion and the coolant reservoir portion in the gravitational direction. A rotating electrical machine characterized by this.

7. A rotating electrical machine according to Claim 6, the housing accommodates the stator and a rotor arranged inside the stator, both legs of a plurality of U-shaped segments constituting the winding are joined to legs of different segments on the other axial side of the stator, the temperature measuring device is arranged on one axial side of the stator, and a through hole for extending a cable of the temperature measuring device to the outside is formed on one axial side of the housing. A rotating electrical machine characterized by this.

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