JP2014117087A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further improve a cooling performance in a rotary electric machine comprising a stator core formed from a powder magnetic material.SOLUTION: A rotary electric machine 1 comprises: a rotor 14; a stator 20 including a stator core 30 formed annular from a powder magnetic substance, provided with a plurality of slots 31 arrayed in a circumferential direction, and disposed outside of the rotor 14 while opposing the rotor 14 in a radial direction, and a stator coil 40 wound around the slots 31 of the stator core 30; and a rear housing 10a as a tubular member fitted to an outer circumferential surface of the stator core 30 and forming a coolant passage 16 extending in a circumferential direction between the rear housing and the stator core 30. In the stator core 30, an introduction passage 37 is provided for radially communicating the coolant passage 16 and the slots 31 and introducing a coolant from the coolant passage 16 into the slots 31.

Description

  The present invention relates to a rotating electrical machine used as an electric motor or a generator in a vehicle, for example.

  2. Description of the Related Art Conventionally, a rotating electrical machine used as an electric motor or a generator in a vehicle includes a rotor that is rotatably provided and a stator that is disposed to face the rotor in a radial direction. The stator includes a stator core having a plurality of slots arranged in the circumferential direction, and a stator coil wound around the slots of the stator core.

  This rotating electrical machine has a structure for cooling in order to solve the problem due to heat generation. For example, a liquid refrigerant such as ATF is generally supplied to the coil ends formed at both axial ends of the stator coil and projecting outward in the axial direction from the axial end surfaces of the stator core to cool the coil ends. Has been done.

  Further, for example, in Patent Document 1, there is a continuous refrigerant flow path between a stator core (stator core) formed by molding a powder magnetic core material and the stator core and the stator core. A motor stator member is disclosed. According to Patent Document 1, it can be effectively cooled and can be easily manufactured.

JP 2006-320054 A

  By the way, a rotating electrical machine mounted as a main engine in a hybrid vehicle is thermally exposed to particularly severe conditions. However, in the case of the above-mentioned Patent Document 1, although the stator core can be cooled by the refrigerant flowing in the refrigerant flow path formed on the outer peripheral surface of the stator core, the stator coil that generates the most heat and has the lowest heat resistance temperature is directly used. Since it is not cooled, a sufficient cooling effect cannot be obtained. Further, since the stator core formed of the dust core material has a lower thermal conductivity than a general stator core formed by laminating electromagnetic steel sheets, the heat inside the stator core cannot be sufficiently drawn to the outer peripheral portion.

  This invention is made | formed in view of the said situation, and makes it the problem which should be solved in the rotating electrical machine which has the stator core formed with the dust magnetic material so that cooling performance can be improved more. Is.

  A first invention made to solve the above problems includes a rotor (14) rotatably provided, and a plurality of slots (31) formed in an annular shape with a dust magnetic material and arranged circumferentially. And a stator core (30) disposed radially opposite the rotor and a stator coil (40) wound around the slot of the stator core. (20) and a cylindrical member (10a) that is fitted to the outer peripheral surface of the stator core and forms a refrigerant passage (16) extending in the circumferential direction between the stator core and the rotating electrical machine. The stator core includes an introduction passage (37) that communicates the refrigerant passage and the slot in a radial direction and introduces the refrigerant from the refrigerant passage into the slot.

  According to the first invention, the stator core has the introduction passage for communicating the refrigerant passage and the slot in the radial direction and introducing the refrigerant from the refrigerant passage to the slot. As a result, the refrigerant introduced from the refrigerant passage through the introduction passage can be directly contacted with the slot accommodation portion of the stator coil accommodated in the stator core slot for efficient cooling. Therefore, in a rotating electrical machine having a stator core with a low thermal conductivity formed of a dust magnetic material, the stator coil can be efficiently and reliably cooled, and the cooling performance can be greatly improved.

  Further, the second invention made to solve the above-mentioned problems includes a rotor (114) that is rotatably provided, and a plurality of slots that are formed in an annular shape with dust magnetic material and arranged in the circumferential direction. (131, 231) having a stator core (130, 230) disposed radially opposite to the rotor and a stator coil wound around the slot of the stator core ( 140, 240) and a stator (120, 220) having a stator, the stator core protrudes axially outward from the axial end faces (130a, 230a) of the stator coil. It has at least one of the 1st convex part (138) and the 2nd convex part (239) used as the flow resistance of the refrigerant | coolant which is supplied to a coil end (141,142,241) and flows below.

  According to the second invention, the stator core has a convex portion that protrudes axially outward from the axial end surface and serves as a flow resistance of the refrigerant that is supplied to the coil end of the stator coil and flows downward. Therefore, when the refrigerant supplied to the coil end of the stator coil flows downward, the convex portion provided on the stator core becomes the flow resistance of the refrigerant, so that the refrigerant stays in the coil end for a longer time. Can be contacted. Thereby, since a coil end can be cooled efficiently, in a rotary electric machine having a stator core with a low thermal conductivity formed of a dust magnetic material, the cooling performance can be greatly improved.

  In addition, the code | symbol in the parenthesis after each member and site | part described in this column and the claim shows the correspondence with the specific member and site | part described in embodiment mentioned later.

FIG. 2 is an axial cross-sectional view schematically showing the configuration of the rotating electrical machine of the first embodiment. It is a figure of the stator which concerns on Embodiment 1, Comprising: (a) is the top view of the stator, (b) is the front view which looked at the stator from the side. 3 is a plan view of a stator core according to Embodiment 1. FIG. 2 is an exploded perspective view of a split core according to Embodiment 1. FIG. It is the front view which looked at the division | segmentation core shown in FIG. 4 from the arrow A direction. 3 is a plan view of a split core according to Embodiment 1. FIG. 6 is a graph comparing the circumferential distribution of the temperature difference between the stator coil and the refrigerant for the rotating electrical machine of Embodiment 1 and the rotating electrical machine of Comparative Example 1; It is an axial sectional view schematically showing the configuration of the rotating electrical machine of the second embodiment. 5 is a plan view of a stator according to Embodiment 2. FIG. It is the partial front view which looked at the stator shown in FIG. 9 from the arrow B direction. 6 is a partial perspective view showing a part of a stator core according to Embodiment 2. FIG. It is the front view which looked at the stator core shown in FIG. 11 from the arrow C direction. 10 is a partial plan view showing a part of a stator core according to Embodiment 2. FIG. 6 is a plan view of a stator according to Embodiment 3. FIG. FIG. 6 is a partial perspective view showing a part of a stator core according to a third embodiment. It is the front view which looked at the stator core shown in FIG. 15 from the arrow D direction.

  Embodiments of a rotating electrical machine according to the present invention will be specifically described below with reference to the drawings.

Embodiment 1
A rotating electrical machine 1 according to a first embodiment will be described with reference to FIGS. The rotating electrical machine 1 according to the first embodiment is used as a vehicle motor, and includes a housing 10, a rotating shaft 13, a rotor 14, and a stator 20, as shown in FIG.

  The housing 10 includes a rear housing 10a as a cylindrical member formed in a bottomed cylindrical shape having one end opened, and a front housing 10b that covers the opening of the rear housing 10a. An annular fitting groove 10c into which the stator 20 is fitted and fixed is provided on the inner peripheral surface of the rear housing 10a. The bottom of the fitting groove 10c is provided with a refrigerant passage 16 that makes one round in the circumferential direction between the stator 20 and the outer circumferential surface of the stator 20 fitted in the fitting groove 10c.

  An inlet 16a for the refrigerant supplied to the refrigerant passage 16 is provided in a portion of the rear housing 10a that is on the antigravity direction side (upper side) when the rear housing 10a is installed in a state where the axial direction is in the horizontal direction. . In addition, in the rear housing 10a, a portion on the gravity direction side (downward side) when installed in a state where the axial direction faces the horizontal direction, an outlet 16b of the refrigerant flowing out from the refrigerant passage 16 and a bottom portion in the housing 10 An outlet 16c for the refrigerant accumulated in is provided.

  The rotating electrical machine 1 is provided with a refrigerant circulation path (not shown) that collects the refrigerant flowing out from the outlets 16b and 16c and circulates it so as to be supplied to the refrigerant passage 16 from the inlet 16a again. A cooler (not shown) for cooling the refrigerant heated by the stator 20 is provided in the middle of the refrigerant circulation path. Thereby, the cooling mechanism which cools the stator 20 with the refrigerant | coolant which circulates through a refrigerant | coolant circulation path is constructed | assembled. In addition, as a refrigerant | coolant, the well-known liquid refrigerant | coolant (for example, ATF etc.) used in the conventional rotary electric machine can be used.

  Both ends of the rotating shaft 13 are rotatably supported via bearings 11 and 12 at the center of the bottom wall of the rear housing 10a and the center of the front housing 10b. A rotor 14 is fitted and fixed to the outer periphery of the central portion in the axial direction of the rotary shaft 13. The outer periphery of the rotor 14 has a plurality of permanent magnets arranged at a predetermined distance in the circumferential direction, and a plurality of magnetic poles having different polarities in the circumferential direction are formed by these permanent magnets. The number of magnetic poles of the rotor 14 is not limited because it varies depending on the specifications of the rotating electrical machine 1. In this embodiment, an 8-pole rotor (N pole: 4, S pole: 4) is used.

  As shown in FIG. 2, the stator 20 includes a stator core 30 that is formed in an annular shape and arranged radially opposite to the outer side of the rotor 14, and a three-phase wound around the stator core 30 ( U-phase, V-phase, and W-phase) stator coils 40. Insulating paper may be provided between the stator core 30 and the stator coil 40.

  As shown in FIG. 3, the stator core 30 is formed in an annular shape by a plurality (24 in this embodiment) of divided cores 32 divided in the circumferential direction, and arranged in the circumferential direction on the inner circumferential side thereof. A plurality of slots 31 are provided. The stator core 30 is fixed (retained) in an annular shape by fitting an outer cylinder 30b (see FIG. 2) to the outer periphery of the split core 32 assembled in an annular shape. The stator core 30 includes an annular back core portion 33 located on the outer peripheral side, and a plurality of teeth 34 protruding radially inward from the back core portion 33 and arranged at a predetermined distance in the circumferential direction. Thus, a slot 31 that opens to the inner peripheral side of the stator core 30 and extends in the radial direction is formed between the side surfaces of the adjacent teeth 34 facing each other in the circumferential direction.

  In the present embodiment, the slot 31 is formed with a double winding per slot of the stator coil 40. Therefore, the slots 31 are formed at a ratio of two per one phase of the stator coil 40 with respect to the number of magnetic poles (8) of the rotor 14. ing. That is, 8 × 3 × 2 = 48 slots 31 are formed. In this case, the 48 slots 31 are formed by the same number (48) of teeth 34 as the slots 31. On the radially outer side of the slot 31, an axial groove 35 that penetrates between both axial end surfaces 30 a of the stator core 30 in the axial direction is provided. The circumferential width of the axial groove 35 gradually decreases from the radially inner opening toward the radially outer bottom.

  As shown in FIGS. 4 and 5, each divided core 32 constituting the stator core 30 is further divided into two in the axial direction, and a first divided core 32 a located on one side in the axial direction, It consists of the 2nd division | segmentation core 32b located in the other axial side. The first divided core 32a and the second divided core 32b are each formed by compression molding a dust magnetic material.

  A groove 36 extending in the radial direction is provided on a split surface between the second split core 32b and the first split core 32a. The opening of the concave groove 36 facing the first divided core 32a is covered and sealed with the divided surface of the first divided core 32a. Thus, both ends of the recessed groove 36 in the extending direction communicate with the refrigerant passage 16 and the slot 31, and the introduction passage 37 for introducing the refrigerant from the refrigerant passage 16 to the slot 31 is provided. In the present embodiment, introduction passages 37 are provided for all the slots 31. The introduction passage 37 is formed at the same time when the second divided core 32b is formed by compression molding a dust magnetic material.

  The stator coil 40 is formed in a cylindrical shape by stacking a predetermined number of conductor wires 45 formed in a predetermined waveform shape in a predetermined state to form a strip-shaped conductor wire assembly and winding the conductor wire assembly in a spiral shape. Is formed. In the present embodiment, as the conductor wire 45 constituting the stator coil 40, a rectangular conductor wire with an insulation coating composed of a copper conductor having a rectangular cross section and an insulating film covering the outer periphery of the conductor is employed.

  The stator coil 40 is assembled with the stator core 30 as follows. That is, after inserting the teeth 34 of each divided core 32 from the outer peripheral side of the stator coil 40 formed into a cylindrical shape and assembling all the divided cores 32 along the stator coil 40 in an annular shape, A cylindrical outer cylinder 30 b is fitted and fixed to the outer periphery of 32. Thereby, as shown in FIG. 2 (b), the stator coil 40 has a slot accommodating portion (not shown) in which a plurality of conductor wires 45 accommodated in the slot 31 are laminated in the radial direction at the central portion in the axial direction. And first and second coil ends 41 and 42 projecting axially outward from the end faces 30a on both axial sides of the stator core 30 at both axial ends.

  As shown in FIG. 6, the slot accommodating portion of the stator coil 40 is a state in which a plurality of (eight in this embodiment) conductor wires 45 are arranged in one row in the radial direction in each slot 31 of the stator core 30. Is housed in. The axial groove 35 provided in each slot 31 has a circumferential width that gradually decreases from the radially inner opening toward the radially outer bottom. The conductor wire 45 located on the outermost peripheral side of 31 does not enter the axial groove 35 and completely block the axial groove 35. As a result, the refrigerant introduced into the slot 31 from the introduction passage 37 can surely flow through the axial groove 35.

  Next, the operation of the rotating electrical machine 1 of the present embodiment will be described. The rotating electrical machine 1 of the present embodiment is installed at a predetermined position of the vehicle so that the inlet 16a of the refrigerant passage 16 is located on the antigravity direction side (upper side). When the operation is started by energizing the stator coil 40, the rotating shaft 13 rotates with the rotation of the rotor 14, and driving force is supplied from the rotating shaft 13 to other devices.

  Simultaneously with the start of operation of the rotating electrical machine 1, a cooling mechanism for cooling the stator 20 is activated, and the refrigerant in the refrigerant circulation path is supplied to the refrigerant path 16 from the inlet 16a. The refrigerant supplied to the refrigerant passage 16 flows downward along the outer periphery of the stator core 30 through the refrigerant passage 16. Thereby, the refrigerant that has flowed through the refrigerant passage 16 while cooling the stator core 30 flows out from the lowermost outlet 16b to the refrigerant circulation path.

  A part of the refrigerant in the refrigerant passage 16 is introduced from the refrigerant passage 16 into the slot 31 via the introduction passage 37 and flows in the axial groove 35 outward in the axial direction. At this time, the refrigerant directly contacts the conductor wire 45 of the stator coil 40 accommodated in the slot 31 to cool the conductor wire 45 efficiently and reliably.

  Thereafter, when the refrigerant that has flowed outward in the axial direction in the axial groove 35 reaches the first and second coil ends 41 and 42, it travels through the conductor wires 45 of the first and second coil ends 41 and 42. Flow in the direction of gravity (downward). At this time, the refrigerant directly contacts the conductor wires 45 of the first and second coil ends 41 and 42, thereby cooling the first and second coil ends 41 and 42 efficiently and reliably. Thereafter, the refrigerant that reaches the lowermost portions of the first and second coil ends 41 and 42 falls to the bottom of the housing 10 and flows out from the outlet 16c to the refrigerant circulation path.

  Further, a part of the refrigerant flowing in the direction of gravity (downward) along the conductor wire 45 of the first and second coil ends 41 and 42 flows into the slot 31, and the stator coil accommodated in the slot 31. Forty conductor wires 45 are cooled. The refrigerant flowing into the slot 31 flows out from the outlet 16b to the refrigerant circulation path via the axial groove 35 and the introduction passage 37.

  Thereafter, the refrigerant returned from the outlets 16b and 16c to the refrigerant circulation path is supplied again to the refrigerant passage 16 from the inlet 16a via the refrigerant circulation path, and the above-described circulation operation is repeated, whereby the stator coil 40 and The stator core 30 is cooled.

  As described above, according to the rotating electrical machine 1 of the present embodiment, the stator core 30 includes the introduction passage 37 that connects the refrigerant passage 16 and the slot 31 in the radial direction and introduces the refrigerant from the refrigerant passage 16 to the slot 31. Have. As a result, the refrigerant introduced from the refrigerant passage 16 through the introduction passage 37 can be directly contacted with the slot accommodation portion of the stator coil 40 accommodated in the slot 31 of the stator core 30 to be efficiently cooled. . Therefore, in the rotary electric machine 1 having the stator core 30 having a low thermal conductivity formed of the dust magnetic material, the cooling performance can be greatly improved.

  Further, in the present embodiment, the plurality of divided cores 32 divided in the circumferential direction further includes first and second divided cores 32a and 32b further divided into two in the axial direction, and one of the second divided cores 32b is divided. A concave groove 36 for defining the introduction passage 37 is formed on the surface. Therefore, the concave groove 36 that partitions the introduction passage 37 can be easily formed. In particular, since the first and second divided cores 32a and 32b constituting the divided core 32 are formed by compression molding a dust magnetic material, the groove 36 can be easily formed during compression molding. .

  In the present embodiment, the stator core 30 has an axial groove 35 that extends in the axial direction and is formed on the radially outer side of the slot 31. Therefore, the refrigerant introduced into the slot 31 from the refrigerant passage 16 via the introduction passage 37 can flow to the first and second coil ends 41 and 42 via the axial groove 35, so that the stator coil 40 Can be cooled more reliably.

[Test 1]
In order to examine the cooling performance of the rotating electrical machine of the first embodiment, the circumferential distribution of the temperature difference with the refrigerant at the first and second coil ends 41 and 42 of the stator coil 40 was measured. In this test, on the entire circumference of the annular first and second coil ends 41, 42, the uppermost position is set to 0 °, and the angle is shifted 45 ° clockwise from the 0 ° position. The temperature was measured at the position, and the temperature difference from the refrigerant temperature was examined. The results are indicated by black circles in the graph of FIG.

  Moreover, as Comparative Example 1, the refrigerant passage 16 provided along the outer peripheral surface of the stator core 30 as in Patent Document 1 is provided, but the introduction passage 37 provided in the first embodiment is not provided. A different rotating electrical machine was prepared, and this Comparative Example 1 was also measured and examined under the same conditions as in the first embodiment. The results are indicated by white circles in the graph of FIG.

  In the graph of FIG. 7, the temperature difference at the temperature measurement position at the center point is 0, and the temperature difference increases radially outward from the center point. Further, the smaller the temperature difference at the temperature measurement position, the higher the cooling effect is obtained.

  As is clear from FIG. 7, in the case of Embodiment 1 (black circle), the temperature difference is small at all positions compared to Comparative Example 1 (white circle), and a high cooling effect is obtained. I understand. In this case, in Embodiment 1, the temperature difference is reduced by about 20% compared to Comparative Example 1.

[Embodiment 2]
A rotating electrical machine 2 according to a second embodiment will be described with reference to FIGS. The rotating electrical machine 2 of the second embodiment is used as a vehicle motor, and includes a housing 110, a rotating shaft 113, a rotor 114, and a stator 120 as shown in FIG.

  The housing 110 includes a pair of a rear housing 110a and a front housing 110b formed in a bottomed cylindrical shape, and is fastened by a bolt 118 in a state in which the openings are joined to each other. The rotor 114 is fitted and fixed to the outer periphery of a rotating shaft 113 that is rotatably supported at both ends of the housing 110 via bearings 111 and 112, and is accommodated in the housing 110. The stator 120 is fixed to the inner periphery of the housing 110 so as to face the outer peripheral side of the rotor 114 in the radial direction.

  Further, the rotating electrical machine 2 is provided with a refrigerant supply means including a pair of pipes 115 and 116 for supplying a cooling medium for cooling to the stator coil 140 of the stator 120. The pipe lines 115 and 116 are attached so as to penetrate the rear housing 110a and the front housing 110b so as to communicate the inside and the outside of the housing 110. Discharge ports 115a and 116a for discharging a cooling medium are provided at the distal ends of the pipes 115 and 116, respectively. The discharge ports 115 a and 116 a are opened vertically above the first and second coil ends 141 and 142 of the stator coil 140 of the stator 120 accommodated in the housing 110.

  The rotating electrical machine 2 collects the refrigerant discharged from the discharge ports 115a and 116a and circulates the refrigerant to be supplied again to the first and second coil ends 141 and 142 from the discharge ports 115a and 116a ( (Not shown) is provided. A cooler (not shown) for cooling the refrigerant heated by the stator 120 is provided in the middle of the refrigerant circulation path. As a result, a cooling mechanism for cooling the stator 120 with the refrigerant circulating in the refrigerant circulation path is constructed. In addition, as a refrigerant | coolant, the well-known liquid refrigerant | coolant (for example, ATF etc.) used in the conventional rotary electric machine can be used.

  The rotor 114 has a plurality of permanent magnets arranged at a predetermined distance in the circumferential direction on the outer circumferential side facing the inner circumferential side of the stator 120, and the plurality of permanent magnets having different polarities alternately in the circumferential direction. Magnetic poles are formed. The rotor 114 has eight magnetic poles (N pole: 4, S pole: 4).

  As shown in FIG. 9, the stator 120 includes a stator core 130 having a plurality of slots 131 (see FIGS. 11 and 13) that are formed in an annular shape with a dust magnetic material and arranged in the circumferential direction. And a three-phase (U-phase, V-phase, W-phase) stator coil 140 wound around the slot 131 of the child core 130.

  The stator core 130 is formed in an integrated annular shape by compression molding a dust magnetic material. As shown in FIG. 11, the stator core 130 includes an annular back core portion 133 and a plurality of teeth 134 that protrude radially inward from the back core portion 133 and are arranged at a predetermined distance in the circumferential direction. Have A slot 131 is formed between the side surfaces of the adjacent teeth 134 facing in the circumferential direction.

  In the case of the present embodiment, since the stator coil 140 is a double-slot distributed winding in the present embodiment, the ratio of the number of the magnetic poles of the rotor 114 (8) is two per one phase of the stator coil 140. It is formed with. That is, 8 × 3 × 2 = 48 slots 131 are formed. In this case, the 48 slots 131 are formed by the same number (48) of teeth 134 as the slots 131.

  As shown in FIGS. 11 and 12, the base end portion (base portion) of the teeth 134 of the stator core 130 is provided with first convex portions 138 that protrude axially outward from both axial end surfaces 130a. It has been. As shown in FIG. 13, the first convex portions 138 are provided on both sides in the circumferential direction of the conductor wire 145 accommodated on the outermost peripheral side in the slot 131. In this case, when the first convex portion 138 is installed in a state where the axial direction of the stator core 130 is oriented in the horizontal direction, the first and second coil ends 141 and 142 of the annular shape are on the antigravity direction side (upward Side) It is provided in the half range.

  The stator coil 140 is formed in a cylindrical shape by stacking a predetermined number of conductor wires 145 formed in a predetermined waveform shape in a predetermined state to form a strip-shaped conductor wire assembly, and winding the conductor wire assembly in a spiral shape. Is formed. In this embodiment, as the conductor wire 145 constituting the stator coil 140, a rectangular conductor wire with an insulation coating composed of a copper conductor having a rectangular cross section and an insulating film covering the outer periphery of the conductor is employed.

  The stator coil 140 is wound around the stator core 130 by winding the conductor wire 145 in a predetermined state around the slot 131 of the stator core 130 using, for example, a conductor wire winding device (not shown). It is disguised. As a result, a slot accommodating portion (not shown) is formed in the central portion of the stator coil 140 in the axial direction, in which a plurality of conductor wires 145 accommodated in the slots 131 are laminated in one row in the radial direction. . Further, first and second coil ends 141 and 142 (see FIG. 8) projecting axially outward from the end faces 130a on both axial sides of the stator core 130 are provided at both axial ends of the stator coil 140. Is formed.

  As shown in FIG. 10, a space portion 147 is formed between the conductor wires 145 extending from the slots 131 adjacent in the circumferential direction inside the first and second coil ends 141 and 142. And each 1st convex part 138 is formed so that it may protrude in those space parts 147. As shown in FIG. Accordingly, the first convex portion 138 becomes a flow resistance when the refrigerant supplied to the first and second coil ends 141 and 142 flows downward, and prevents the refrigerant from passing in a short time. The refrigerant stays in the first and second coil ends 141 and 142 for a longer time.

  The rotating electrical machine 2 of the present embodiment configured as described above is installed at a predetermined position of the vehicle such that the refrigerant discharge ports 115a and 116a are located on the antigravity direction side (upper side). When the operation is started by energizing the stator coil 140, the refrigerant for cooling is discharged from the discharge ports 115 a and 116 a of the pipe lines 115 and 116 by the refrigerant supply means. The discharged refrigerant is supplied to the upper part (antigravity direction side) of the first and second coil ends 141 and 142 and flows downward through the first and second coil ends 141 and 142.

  At this time, the first protrusion 138 provided on the stator core 130 becomes the flow resistance of the refrigerant, so that the refrigerant is longer without passing through the first and second coil ends 141 and 142 in a short time. It will stay for hours. Therefore, the first and second coil ends 141 and 142 can be in contact with the refrigerant for a longer time, and thus are efficiently cooled.

  As described above, according to the rotating electrical machine 2 of the present embodiment, the stator core 130 protrudes axially outward from the end surface 130a and is supplied to the first and second coil ends 141 and 142 of the stator coil 140. It has the 1st convex part 138 used as the flow resistance of the refrigerant | coolant which flows below. Therefore, when the refrigerant supplied to the first and second coil ends 141 and 142 of the stator coil 140 flows downward, the first convex portion 138 provided on the stator core 130 becomes the flow resistance of the refrigerant. As a result, the refrigerant can stay in and contact the first and second coil ends 141 and 142 for a longer time. As a result, the first and second coil ends 141 and 142 can be efficiently cooled. Therefore, in the rotating electrical machine 2 having the stator core 130 having a low thermal conductivity formed of a dust magnetic material, the cooling performance can be improved. It can be greatly improved.

  Moreover, since the 1st convex part 138 is formed when compression molding the powder magnetic material and forming the stator core 130, the 1st convex part 138 can be easily formed at the time of compression molding.

  In addition, when the first convex portion 138 is installed in a state in which the axial direction of the stator core 130 faces the horizontal direction, the first and second coil ends 141 and 142 are disposed on the antigravity direction side of the first and second coil ends 141 and 142. It protrudes into a space 147 formed in the coil ends 141 and 142. As a result, the refrigerant introduced to the antigravity direction side (upper side) of the first and second coil ends 141 and 142 can be retained for a longer time on the antigravity direction side.

  Moreover, since the 1st convex part 138 is provided in the circumferential direction both sides of the conductor wire 145 of the stator coil 140 accommodated in the outermost periphery side in the slot 131, the 1st convex part 138 is provided in an optimal position. be able to.

  In the present embodiment, the first protrusions 138 are provided on the end faces 130a on both sides in the axial direction of the stator core 130, but may be provided on any one end face 130a in the axial direction. However, in order to obtain a better cooling effect by providing the first convex portion 138, it is preferable to provide the first convex portion 138 on the end faces 130a on both axial sides as in this embodiment. .

[Embodiment 3]
A rotating electrical machine according to Embodiment 3 will be described with reference to FIGS. The rotating electrical machine of the third embodiment has the same basic configuration as the rotating electrical machine 2 of the second embodiment, and the configuration of the stator core 230 is different from that of the second embodiment. Therefore, detailed description of members and configurations common to the rotating electrical machine 2 of Embodiment 2 is omitted, and different points and important points will be described. In addition, the same code | symbol is used for the member which is common in Embodiment 2. FIG.

  As shown in FIG. 14, the stator 220 of the third embodiment includes a stator core 230 having a plurality of slots 231 that are formed in an annular shape with a dust magnetic material and arranged in the circumferential direction. And a three-phase (U-phase, V-phase, W-phase) stator coil 240 wound around the slot 231. The stator coil 240 according to the third embodiment is the same as the stator coil 140 according to the second embodiment, and thus detailed description thereof is omitted.

  As in the second embodiment, the stator core 230 is formed in an integrated annular shape by compression molding a dust magnetic material. As shown in FIG. 15, the stator core 230 is arranged in an annular back core portion 233 and radially inward from the back core portion 233 with a predetermined distance in the circumferential direction, as in the second embodiment. A plurality of (48) teeth 234. A slot 231 is formed between the side surfaces of the adjacent teeth 234 facing each other in the circumferential direction.

  The stator core 230 is not provided with the one corresponding to the first convex portion 138 of the second embodiment, and is different from the stator core 230 of the second embodiment in that a second convex portion 239 is provided instead. Different. The second convex portions 239 are formed in a semicircular arc shape that protrudes outward in the axial direction from both axial end surfaces 230a of the back core portion 233 and continuously extends in the circumferential direction. In other words, the second convex portion 239 is formed on the outer side in the radial direction of the slot 231, the first coil end 241 and the second coil end (not shown) in the circumferential direction along the inner peripheral end portion of the back core portion 233. It is formed to extend. When the second convex portion 239 is installed in a state in which the axial direction of the stator core 230 faces the horizontal direction, the range of the first and second coil ends 241 of the annular shape in the gravitational direction side (lower side) half. Is provided.

  As in the case of the second embodiment, the rotating electrical machine of the third embodiment configured as described above is configured so that the refrigerant discharge ports 115a and 116a are positioned on the anti-gravity direction side (upper side). Installed in position. When the operation is started by energizing the stator coil 40, the refrigerant discharged from the discharge ports 115 a and 116 a of the pipe lines 115 and 116 by the refrigerant supply means is above the first and second coil ends 241. (Anti-gravity direction side) and flows downward through the first and second coil ends 241.

  At this time, the second convex portion 239 provided on the stator core 230 becomes the flow resistance of the refrigerant, so that the refrigerant stays for a longer time without passing through the first and second coil ends 241 in a short time. Will come to do. Therefore, the first and second coil ends 241 can be contacted with the refrigerant for a longer time, and thus are efficiently cooled.

  As described above, according to the rotating electrical machine of the third embodiment, the stator core 230 has the second convexity that is the flow resistance of the refrigerant that is supplied to the first and second coil ends 241 of the stator coil 240 and flows downward. Part 239. Therefore, the second convex portion 239 becomes the flow resistance of the refrigerant, so that the refrigerant can stay in and contact the first and second coil ends 241 for a longer time. Play.

  In the present embodiment, the second convex portion 239 is provided on the end faces 30a on both sides in the axial direction of the stator core 230, but may be provided on any one end face 230a in the axial direction. However, in order to obtain a better cooling effect by providing the second convex portion 239, it is preferable to provide the second convex portion 239 on the end faces 230a on both sides in the axial direction as in this embodiment.

  Further, the second convex portion 239 of the present embodiment may be provided together with the first convex portion 128 of the second embodiment. In this case, the first convex portion 138 and the second convex portion 239 can cool the entire circumferential direction of the first and second coil ends 241, so that a better cooling effect can be obtained. it can.

[Other Embodiments]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the first embodiment, the stator core 30 is configured by the plurality of divided cores 32 divided in the circumferential direction, but may be an integral type that is not divided. Further, the divided core 32 is further divided into two pieces in the axial direction, but may be divided into three or more pieces.

  In the first embodiment, the groove 36 that defines the introduction passage 37 is provided only in the second divided core 32b, but may be provided only in the first divided core 32a, or may be provided in both of them. Good. That is, the concave groove 36 can be provided on at least one of the two divided surfaces facing each other of the divided core 32 divided into a plurality of parts in the axial direction.

  In the first to third embodiments, the example in which the first invention according to the first embodiment and the second invention according to the second and third embodiments are applied to separate rotating electric machines has been described. The first invention and the second invention can be simultaneously applied to the electric machine. This makes it possible to obtain a better cooling effect, thereby further improving the cooling performance.

  In this case, in the first embodiment (first invention), the refrigerant supplied to the refrigerant passage 16 is supplied from the introduction passage 37 through the axial groove 35 of the slot 31 to the first and second coil ends. In the second and third embodiments (second invention), the pipelines 115 and 116 and the discharge ports 115a and 116a provided for supplying the refrigerant are excluded in the second and third embodiments (second invention). be able to.

  In addition, although said Embodiment 1-3 is an example which applied the rotary electric machine which concerns on this invention to the motor (electric motor), this invention is an electric motor or a generator as a rotary electric machine mounted in a vehicle, Furthermore, The present invention can also be used for a rotating electrical machine that can selectively use both.

  DESCRIPTION OF SYMBOLS 1, 2 ... Rotating electric machine, 10a ... Rear housing (cylindrical member) 14, 114 ... Rotor, 16 ... Refrigerant passage, 20, 120, 220 ... Stator, 30, 130, 230 ... Stator core, 30a, 130a, 230a ... end face 31, 131, 231 ... slot, 35 ... axial groove, 36 ... concave groove, 37 ... introduction passage, 40, 140, 240 ... stator coil, 41, 141, 241 ... first coil end 42, 142 ... second coil end, 45, 145 ... conductor wire, 138 ... first convex portion, 147 ... space portion, 239 ... second convex portion.

Claims (9)

A rotor (14) provided rotatably and a plurality of slots (31) formed in an annular shape with a dust magnetic material and arranged in a circumferential direction, and radially opposed to the outside of the rotor. And a stator core (30) having a stator core (30) and a stator coil (40) wound around the slot of the stator core, and fitted to the outer peripheral surface of the stator core A cylindrical member (10a) that forms a refrigerant passage (16) extending in a circumferential direction between the stator core and the stator core,
The rotating electrical machine according to claim 1, wherein the stator core includes an introduction passage (37) that connects the refrigerant passage and the slot in a radial direction and introduces the refrigerant from the refrigerant passage to the slot.   The stator core is divided into a plurality of parts in the axial direction, and a concave groove (36) for defining the introduction passage is formed in at least one of the two divided faces facing each other. The rotating electrical machine according to claim 1.   The rotary electric machine according to claim 2, wherein the concave groove is formed when the stator core is formed by compression molding the dust magnetic material.   The rotating electric machine according to any one of claims 1 to 3, wherein the stator core has an axial groove (35) formed in an outer side in the radial direction of the slot and extending in the axial direction. . A rotor (114) provided rotatably and a plurality of slots (131, 231) formed in an annular shape with a dust magnetic material and arranged in the circumferential direction have a radial direction outside the rotor. A stator core (130, 230) having a stator core (130, 230) arranged opposite to each other and a stator coil (140, 240) wound around the slot of the stator core. In the rotating electric machine
The stator core protrudes axially outward from the axial end faces (130a, 230a), and serves as a flow resistance of the refrigerant that is supplied to the coil ends (141, 142, 241) of the stator coil and flows downward. A rotating electrical machine having at least one of a first protrusion (138) and a second protrusion (239).   The rotating electrical machine according to claim 5, wherein the first and second convex portions are formed when the stator core is formed by compression molding the dust magnetic material.   The first convex portion is a space portion (147) formed in the coil end on the antigravity direction side of the coil end when the axial direction of the stator core is installed in a horizontal direction. The rotating electrical machine according to claim 5, wherein the rotating electrical machine projects.   8. The rotating electrical machine according to claim 7, wherein the first protrusions are provided on both sides in the circumferential direction of the conductor wire (145) of the stator coil housed on the outermost periphery side in the slot. .   When the axial direction of the stator core is oriented in the horizontal direction, the second convex portion is continuously in the circumferential direction on the radially outer side of the slot on the gravity direction side of the coil end. The rotating electrical machine according to claim 5 or 6, wherein the rotating electrical machine is provided.

Images