Rotating electrical machine

Abstract

Deviation of the range of adhesion of refrigerant to the end portion of the coil is suppressed. The rotating electric machine includes a rotor, a stator, and a housing. The housing forms a flow-out hole (122A, 122B) for causing refrigerant to flow out to a slot outer conductor (139) of the stator coil. In a state where the housing (110) is disposed with a rotational center axis (Ca) being horizontal, the flow-out hole (122A, 122B) is disposed above the slot outer conductor (139), in a case where a bending direction (Da) of the slot outer conductor with respect to a slot inner conductor disposed in an outermost diameter side in a slot among the stator coils disposed in an upper portion of the stator is taken as a coil bending direction, a first flow-out hole (122A) is disposed on a bending direction (Da) side with respect to a perpendicular line (VL) passing through the rotational center axis (Ca), and a second flow-out hole (122B) is disposed on a side opposite to the bending direction (Da) with respect to the perpendicular line (VL), and a disposition angle (θb) of the second flow-out hole (122B) is larger than a disposition angle (θa) of the first flow-out hole (122A) with the perpendicular line (VL) as a reference.

Description

Technical Field

[0001] This invention relates to a rotary electric motor. Background Technology

[0002] A rotary electric motor is known to include: a rotor; a stator disposed on the outer diameter side of the rotor; and a cooling structure that drips coolant onto the ends of stator coils wound on the stator to cool the ends of the coils (see Patent Document 1). When the coolant drips onto the ends of the coils, the dripping coolant flows downward along the circumference of the ends of the coils, thereby cooling the ends of the coils. Existing technical documents Patent documents

[0003] Patent Document 1: Japanese Patent Application Publication No. 2015-80330 Summary of the Invention The problem the invention aims to solve

[0004] The inventors of this application have discovered the following problem: because the outer conductor protruding from the slot of the stator core bends toward the circumferential side relative to the inner conductor, a deviation occurs in the attachment range of the refrigerant to the end of the coil, which affects the cooling performance of the refrigerant.

[0005] The purpose of this invention is to suppress the deviation of the refrigerant attachment range to the coil end, thereby effectively cooling the stator coil. Technical means to solve the problem

[0006] One aspect of the present invention provides a rotary electric motor comprising: a rotor arranged horizontally with its central axis of rotation; a stator arranged radially from the rotor with a gap; and a housing supporting the stator and forming a flow path for refrigerant to flow. The stator includes a stator core having a plurality of slots and stator coils mounted on the stator core. The stator coils have in-slot conductors disposed within the slots of the stator core and out-of-slot conductors disposed outside the slots. The housing forms a first outflow hole and a second outflow hole for refrigerant to flow toward the out-of-slot conductors. With the housing in place, the first outlet hole and the second outlet hole are positioned above the outer conductor of the slot. The bending direction of the outer conductor of the slot relative to the outermost diameter side of the inner conductor of the stator coil positioned in the slot at the upper part of the stator is taken as the bending direction of the upper coil. A straight line perpendicular to the horizontal and passing through the rotation center axis is taken as the vertical line. The first outlet hole is positioned on the side of the upper coil bending direction relative to the vertical line, and the second outlet hole is positioned on the side opposite to the bending direction of the upper coil relative to the vertical line. The first outlet hole and the second outlet hole are formed such that the angle formed by the straight line connecting the first outlet hole and the rotation center axis and the vertical line, i.e., the second configuration angle, is larger than the first configuration angle. The effects of the invention

[0007] According to the present invention, deviations in the refrigerant's attachment range to the coil ends can be suppressed, and the stator coil can be effectively cooled. Attached Figure Description

[0008] Figure 1 This is a diagram showing a schematic configuration of a hybrid electric vehicle equipped with a rotary motor according to an embodiment of the present invention. Figure 2 This is a side cross-sectional view showing the configuration of a rotary electric motor according to an embodiment of the present invention. Figure 3 It is a 3D diagram of a rotary electric motor, omitting the illustration of the casing. Figure 4 It is a top cross-sectional view of the stator core and the rotor core. Figure 5 It is a three-dimensional diagram representing the three-phase stator coils. Figure 6A It is a three-dimensional view of the U-phase stator coil wound on the stator core. Figure 6B It is a three-dimensional diagram of the stator coil of phase U1 wound on the stator core. Figure 7 This is a schematic diagram illustrating the process of installing segmented conductors onto the stator core. Figure 8 This is a schematic diagram illustrating the position of the segmented conductors inserted into the slots of the stator core. Figure 9 This is a plan view (top view) of the rotary motor mounted on the vehicle body. Figure 10 This is a side view taken from the axial direction of the rotary motor mounted on the vehicle body. Figure 11A This is a diagram showing the adhesion range of the refrigerant in the rotary motor of this embodiment. Figure 11B This is a diagram showing the adhesion range of the refrigerant in the rotary motor of the comparative example of this embodiment. Detailed Implementation

[0009] Referring to the accompanying drawings, a rotary motor according to an embodiment of the present invention will be described. This rotary motor is suitable for use in automobiles. It is applicable to both pure electric vehicles driven solely by the rotary motor and hybrid electric vehicles driven by both an engine and the rotary motor. Furthermore, the rotary motor can be an induction motor with a squirrel-cage rotor or a synchronous motor with a rotor having permanent magnets. Hereinafter, a synchronous motor used in a hybrid electric vehicle will be described as an example.

[0010] Figure 1 This diagram illustrates a schematic configuration of a hybrid electric vehicle equipped with a rotary motor according to an embodiment of the present invention. The electric vehicle (also referred to as a vehicle) includes an engine ENG, a first rotary motor 100A, and a second rotary motor 100B. The first rotary motor 100A and the second rotary motor 100B are collectively referred to as rotary motor 100. Power generated by the engine ENG and the first rotary motor 100A is transmitted to the front wheels FW via a transmission TM. Power generated by the second rotary motor 100B is transmitted to the rear wheels RW.

[0011] The rotary motor 100 operates in two ways: generating driving force and regenerating energy, depending on the vehicle's driving status. The driving and power generation operations of the rotary motor 100 are controlled by the power conversion device INV to optimize torque and speed based on the vehicle's operating conditions. The power required to drive the rotary motor 100 is supplied from the battery BAT via the power conversion device INV. Additionally, when the rotary motor 100 is generating energy, the battery BAT is charged via the power conversion device INV.

[0012] The structure of the rotary motor 100 will be described with reference to the accompanying drawings. Since the first rotary motor 100A and the second rotary motor 100B have substantially the same structure, the structure of the first rotary motor 100A will be used as a representative example in the following description. Furthermore, the structure shown below does not need to be used in both the first rotary motor 100A and the second rotary motor 100B, and may be used in only one of them. In the following description, "axial," "circumferential," and "radial" are defined as follows: "Axial" refers to the direction along the rotational center axis Ca of the rotary motor 100 (rotor 150). The rotational center axis Ca is aligned with the central axis of the cylindrical stator 130. "Circumferential" refers to the direction along the rotational direction of the rotary motor 100 (rotor 150), that is, the circumferential direction orthogonal to the rotational center axis Ca and centered on the rotational center axis Ca. "Radial" refers to the radial direction, that is, the radial direction, orthogonal to the rotational center axis Ca of the rotary motor 100 and centered on the rotational center axis Ca. In addition, "inner circumferential side" refers to the radial inner side (inner diameter side), and "outer circumferential side" refers to the opposite direction, that is, the radial outer side (outer diameter side).

[0013] Figure 2 This is a side cross-sectional view showing the configuration of the rotary motor 100 according to an embodiment of the present invention. Figure 2 In the diagram, the interior of the rotary motor 100 is represented by a section of the rotary motor 100. Figure 3 This is a perspective view of the rotary motor 100, omitting the illustration of the housing 110. Figure 4 This is a top cross-sectional view of the stator core 132 and the rotor core 152, showing the cross-section of the rotating motor 100 viewed from the axial direction.

[0014] like Figure 2 As shown, the rotary motor 100 has a rotor 150 that is rotatably disposed, a stator 130 that is disposed radially outward from the rotor 150 through a gap, and a housing 110 that supports (fixes) the stator 130.

[0015] The rotary electric motor 100 is a three-phase synchronous electric generator with embedded permanent magnets. The rotary electric motor 100 operates as a motor that rotates the rotor 150 by supplying three-phase alternating current to the stator coils 138 wound on the stator core 132. Additionally, the rotary electric motor 100 operates as a generator driven by an engine ENG, outputting three-phase alternating generated electricity.

[0016] The housing 110 has a housing body 112 and end brackets 111. The housing body 112 is a bottomed cylindrical member with one open end, having a cylindrical portion 113 and a bottom 114. The end brackets 111 are mounted on the housing body 112 in a manner that blocks the opening of the housing body 112 (the opening of the cylindrical portion 113). Insertion holes 111a and 114a for inserting a shaft 118 are provided on the end brackets 111 and the bottom 114 of the housing body 112. A first bearing 14A is provided in the insertion hole 111a of the end bracket 111, and a second bearing 14B is provided in the insertion hole 114a of the bottom 114 of the housing body 112. Alternatively, the housing 110 may also be composed of a central bracket with openings at both ends along the axial direction and a pair of end brackets that clamp the central bracket along the axial direction. In other words, the cylindrical part 113 and the bottom 114 of the main body 112 can be set as different components, and the two components can be connected by bolts or the like.

[0017] The housing 110 is provided with a mounting portion 110a that is mounted on a support member 9 of the vehicle body. The support member 9 of the vehicle body is, for example, a support member provided on the housing of the transmission TM, a support member provided on the housing of the engine ENG, or a support member provided between the transmission TM and the engine ENG. The mounting portion 110a is fastened to the support member 9 by bolts or the like, thereby mounting the rotary motor 100 onto the vehicle. Alternatively, the housing 110 may be made part of the housing of the transmission TM or the engine ENG.

[0018] The rotor 150 is fixed to the shaft 118. The shaft 118 is a cylindrical or cylindrical member. The shaft 118 is supported by a first bearing 14A and a second bearing 14B, thereby allowing the rotor 150 to be rotatably held inside the stator core 132. The rotor 150 is configured such that the rotation center axis Ca is horizontal. That is, the mounting portion 110a of the housing 110 is formed such that when mounted on the support member 9, the rotation center axis Ca is horizontally positioned.

[0019] A refrigerant passage 121, serving as a flow path for liquid refrigerant, is formed on the cylindrical portion 113 of the housing body 112. That is, the housing body 112 is a flow path forming member for the refrigerant passage 121. In this embodiment, the refrigerant passage 121 has a rectangular cross-sectional shape where the width (axial length) is greater than the height (radial length), and is formed in a spiral shape along the circumference of the cylindrical portion 113.

[0020] The refrigerant has a dynamic viscosity of 4–24 mm at 100°C. 2 The oil is [ / s]. In this embodiment, the refrigerant is ATF (Automatic Transmission Fluid), which is used for lubrication and cooling of components (power transmission parts, etc.) within the transmission™.

[0021] Refrigerant is drawn from the refrigerant storage section (not shown) at the bottom of the rotary motor 100 by a pump (not shown), and flows through the refrigerant passage 121 from the first outlet hole 122A and the second outlet hole 122B formed in the upper part of the housing 110 (see reference). Figure 10 The refrigerant flows out and returns to the refrigerant storage section. In the rotary motor 100, the stator coil 138 is the main heat-generating part. The heat generated by the stator coil 138 is transferred to the housing 110 via the stator core 132 and dissipated by the refrigerant flowing in the refrigerant passage 121 of the housing 110. In this embodiment, the refrigerant drips from the first outlet hole 122A and the second outlet hole 122B onto the coil end 139 of the stator coil 138 and adheres to the coil end 139, thereby directly cooling the stator coil 138. Details of the first outlet hole 122A and the second outlet hole 122B will be described later. In addition, although not shown, the refrigerant is cooled by an air-cooled or water-cooled heat exchanger (oil cooler).

[0022] like Figure 2 and Figure 3 As shown, the stator 130 has a cylindrical stator core 132 and stator coils 138 mounted on the stator core 132. (As...) Figure 4 As shown, a plurality of slots 133 (72 in this embodiment) parallel to the central axis of the stator core 132 are formed on the inner circumference of the stator core 132. Stator coils 138 (see reference) are installed in the slots 133. Figure 2 , Figure 3 and Figure 5 The stator core 132 has multiple phase windings of phases U, V, and W. Multiple slots 133 are formed at equal intervals in the circumferential direction of the stator core 132.

[0023] Teeth 134 are formed between slots 133. In this embodiment, the plurality of teeth 134 are integrally formed with the annular core back 135. That is, the stator core 132 is an integral core in which the plurality of teeth 134 and the core back 135 are integrally formed. The teeth 134 form a radial magnetic circuit, and the core back 135 forms a circumferential magnetic circuit. The teeth 134 guide the rotating magnetic field generated by the stator coils 138 to the rotor 150, thereby generating a rotational torque in the rotor 150.

[0024] The stator core 132 is formed, for example, by stacking multiple annular electromagnetic steel plates. The stator core 132 is fitted and fixed to the cylindrical part (see reference) by means of hot pressing, pressing, etc. Figure 2 )113 on the inside.

[0025] like Figure 2 and Figure 4As shown, the rotor 150 includes a rotor core 152 and a plurality of permanent magnets 154 fixed to the rotor core 152. The rotor core 152 is formed, for example, by stacking multiple annular electromagnetic steel plates. The permanent magnets 154 form the field poles of the rotor 150. The permanent magnets 154 can be neodymium-based, samarium-based sintered magnets, ferrite magnets, neodymium-based bonded magnets, etc.

[0026] On the rotor core 152, cuboid-shaped magnet insertion holes are formed at equal intervals along the circumference near the outer periphery. Permanent magnets 154 are embedded in each magnet insertion hole and fixed with adhesive or the like. The circumferential width of the magnet insertion hole is greater than the circumferential width of the permanent magnet 154. Magnetic gaps 156 are formed between the circumferential ends of the permanent magnet 154 and the circumferential ends of the magnet insertion holes. Adhesive can be embedded in these magnetic gaps 156, or resin can be used to integrally fix the permanent magnet 154 to the core.

[0027] The magnetization direction of the permanent magnet 154 is radial, and the magnetization direction is reversed for each field pole. That is, if the surface of the permanent magnet 154 used to form a certain magnetic pole on the stator 130 side is magnetized as the N pole and the surface on the shaft 118 side is magnetized as the S pole, then the surface of the permanent magnet 154 forming the adjacent magnetic pole on the stator 130 side is magnetized as the S pole and the surface on the shaft 118 side is magnetized as the N pole.

[0028] In this embodiment, an auxiliary magnetic pole 159 is formed between each permanent magnet 154 that forms a magnetic pole. This auxiliary magnetic pole 159 serves to reduce the magnetic reluctance of the q-axis magnetic flux generated by the stator coil 138. Through the auxiliary magnetic pole 159, the magnetic reluctance of the q-axis magnetic flux becomes very small compared to the magnetic reluctance of the d-axis magnetic flux, thus generating a large reluctance torque.

[0029] Reference Figure 2 and Figures 5-8 The stator coil 138 will be explained. Figure 5 This is a 3D diagram representing the three-phase stator coil 138. Figure 6A This is a three-dimensional view of the U-phase stator coil 138 wound on the stator core 132, showing the U1 and U2 phase stator coils 138. Figure 6B This is a perspective view of the stator coil 138 of phase U1 wound on the stator core 132. The stator coil 138 is wound on the stator core 132 in a distributed winding (waveform winding) manner. Distributed winding refers to a winding method in which the phase winding is wound on the stator core 132 in a manner that accommodates the phase winding in two slots 133 that are separated by multiple slots 133.

[0030] The stator coil 138 has an in-slot conductor 137 disposed within a slot 133 of the stator core 132, and an out-of-slot conductor, i.e., coil end 139, protruding from both ends of the stator core 132 out of the slot 133. The stator coil 138 uses flat wires in each slot 133 whose radial length in the rectangular cross-section of the stator coil 138 is longer than its circumferential length (see reference). Figure 7 (d)). In addition, the outer periphery of the flat wire is covered with an insulating film.

[0031] like Figure 6A , Figure 6B and Figure 7 As shown, the stator coil 138 is a segmented coil formed by interconnecting multiple segmented conductors 140 in a U-shape. Figure 6A and Figure 6B As shown, the central portion 140c of the segmented conductor 140 forms one axial coil end 139 of the stator 130, and the two ends 140e on both sides are welded to form the other axial coil end 139 of the stator 130.

[0032] like Figure 5 As shown, the stator coil 138 consists of six systems (U1, U2, V1, V2, W1, W2) whose coils are mounted close to each other on the stator core 132. The coils of the six systems constituting the stator coil 138 are arranged with appropriate intervals between each other through slots 133.

[0033] On one end 139 of the stator coil 138, AC terminals 41(U), 42(V), and 43(W) for the input and output of the stator coils 138 for each of the three phases U, V, and W, and a neutral point connection conductor 40 are led out. The stator 130 is connected to the power conversion device INV via the AC terminals 41(U), 42(V), and 43(W). The neutral point connection conductor 40 is arranged on both sides of the AC terminals 41(U), 42(V), and 43(W). The neutral point connection conductor 40 is composed of the U1 phase neutral wire (the winding end point of phase U1), the V1 phase neutral wire (the winding end point of phase V1), and the W1 phase neutral wire (the winding end point of phase W1), and is pre-welded together. The same applies to phases U2, V2, and W2.

[0034] Figure 7 This is a schematic diagram illustrating the process of mounting the segmented conductor 140 onto the stator core 132. Additionally, in Figure 7 In (d), the illustration of the insulating paper (slot liner) disposed between the segmented conductor 140 and the slot 133 is omitted. Figure 8 This is a schematic diagram illustrating the positions of the segmented conductors 140 inserted into the slots 133 of the stator core 132. In this embodiment, 12 slots 133 are arranged at 360-degree electrical angles, for example, from... Figure 8Slot numbers 01 to 12 correspond to 2 poles. Therefore, there are 6 slots per pole and 2 (NSPP) slots per pole per phase (6 / 3). In each slot 133, four segmented conductors 140 of the stator coils 138 are inserted. Within the rectangular boxes representing the segmented conductors 140, a cross symbol “×” indicating the direction from one side of the stator core 132 to the opposite side and a black circle symbol “●” indicating the opposite direction are marked. Furthermore, the segmented conductors 140 of the U phase are represented by symbols U11 to U24 indicating the winding, and the segmented conductors 140 of the V and W phases are represented by the symbols V and W indicating the phase.

[0035] like Figure 7 As shown in (a), the segmented conductor 140 is formed in a generally U-shape having a pair of legs 141a and 141b extending in a straight line and a top 142 connecting the pair of legs 141a and 141b to each other. The top 142 has a pair of inclined portions 143a and 143b and a curved portion 144 connecting the pair of inclined portions 143a and 143b to each other. A curved portion 145, formed by bending the conductor, is formed between the two ends of the top 142 and the pair of legs 141a and 141b. That is, the top 142 and the legs 141a and 141b are connected by the curved portion 145. The inclined portions 143a and 143b are inclined at a predetermined angle relative to the legs 141a and 141b, which are parallel to the axial direction.

[0036] When segmented conductors 140 are connected to each other to form phase windings, such as Figure 7 As shown in (a), a pair of legs 141a and 141b of the segmented conductor 140 are inserted into different slots 133 from one axial side of the stator core 132. Then, as... Figure 7 As shown in (b), the feet 141a and 141b protruding axially to the other side of the stator core 132 are bent toward the direction of the segmented conductor to be connected, as shown in (b). Figure 7 As shown in (c), the ends 140e of the feet 141a and 141b are welded to the ends 140e of other segment conductors 140.

[0037] The portion where the segmented conductors 140 connect to each other is designated as the connecting portion 149. The connecting portion 149 has a pair of inclined portions 147a and 147b and end portions 140e respectively provided on the inclined portions 147a and 147b. The end portion 140e is formed by bending the top end of the inclined portion 147a parallel to the axial direction. The inclined portions 143a and 143b are connected to the feet 141a and 141b via a bending portion 146. The bending portion 146 is formed by bending the ends of the pair of feet 141a and 141b outwards in a circumferential manner, separating them from each other. Similar to the inclined portions 143a and 143b, the inclined portions 147a and 147b are inclined at a predetermined angle relative to the straight portions of the feet 141a and 141b parallel to the axial direction. The insulating coating on the end portion 140e is removed before soldering.

[0038] Each segment of conductor 140 is welded at its end 140e, and when it is mounted on the stator core 132 as stator coil 138, as... Figure 7 As shown in (d), the straight portions of a pair of legs 141a and 141b of each segment conductor 140 are arranged in slot 133. Therefore, the straight portions of legs 141a and 141b arranged in slot 133 correspond to slot conductor 137 in stator coil 138.

[0039] like Figure 8 As shown, multiple (four) slot conductors 137 are arranged in layers within each slot 133 of the stator core 132. In this embodiment, four conductor insertion spaces are provided within each slot 133. Each conductor insertion space is sequentially designated as the first layer (L1), second layer (L2), third layer (L3), and fourth layer (L4) from the radial inner circumference (lower side of the diagram) to the outer circumference (upper side of the diagram). Figure 7 As shown in (d), in the segmented conductor 140, there is a structure in which one of the pairs of legs 141a and 141b is inserted through the first layer (L1) and the other leg 141a is inserted through the second layer (L2), and a structure in which one of the pairs of legs 141a and 141b is inserted through the third layer (L3) and the other leg 141a is inserted through the fourth layer (L4).

[0040] like Figure 2 As shown, the coil end (outer slot conductor) 139, which protrudes outward from the stator core 132 along one axial direction (left side of the diagram) and protrudes from the stator core 132, has a head 142 (see reference). Figure 7 The coil end 139 is also referred to as the bent coil end 139B. The coil end (outer slot conductor) 139, which protrudes outward from the stator core 132 on the other side of the axial direction (right side of the figure) and is exposed from the stator core 132, has a connecting portion 149 (see reference). Figure 7 The coil end 139 is also referred to as the welded coil end 139A. Additionally, as... Figure 3 As shown, since the coil ends 139 are arranged to overlap in the circumferential direction of the stator core 132, the axial length of the rotary motor 100 can be shortened.

[0041] Reference Figure 9 and Figure 10 The outflow holes 122A and 122B that allow the refrigerant to flow out to the coil end 139 are described in detail. Figure 9 and Figure 10 These are a plan view (top view) and a side view (partial cross-sectional view) of the rotary motor 100 mounted on the vehicle body. Figure 9 It means from Figure 2 A diagram of the rotary motor 100 viewed from the IX direction. Figure 9 In the image, the main body of the housing 112 is represented by a double-dotted line, and a portion of the welding coil end 139A is shown in magnification. Figure 10 This is a diagram showing the end of the welding coil 139A viewed from the axial direction. Figure 10 In, it means Figure 2 The cross-section of the housing 110 under the XX line is enlarged to show the first outflow hole 122A and the second outflow hole 122B.

[0042] like Figure 9 As shown, a first outflow hole 122A and a second outflow hole 122B are respectively provided on one axial end side (the side of the bent coil end 139B) and the other axial end side (the side of the welding coil end 139A) of the housing body 112. Furthermore, the refrigerant outflow holes on the axial end side of the housing body 112 are only the first outflow hole 122A and the second outflow hole 122B; there are no other refrigerant outflow holes that drip refrigerant towards the bent coil end 139B. Similarly, the refrigerant outflow holes on the other axial end side of the housing body 112 are only the first outflow hole 122A and the second outflow hole 122B; there are no other refrigerant outflow holes that drip refrigerant towards the welding coil end 139A. The first outlet hole 122A and the second outlet hole 122 are respectively provided on one axial end side (the side of the bent coil end 139B) and the other axial end side (the side of the welding coil end 139A) of the housing body 112, and have the same configuration. Therefore, the following description will take the first outlet hole 122A and the second outlet hole 122B that drip refrigerant to the welding coil end 139A as examples.

[0043] Figure 9 and Figure 10 The mounting portion 110a of the housing 110 is mounted on the support member 9 of the vehicle body (see reference). Figure 2 The housing 110 is positioned at a predetermined location on the vehicle body. For example... Figure 9 and Figure 10 As shown, with the housing 110 in place, the first outlet hole 122A and the second outlet hole 122B are positioned above the coil end 139. The first outlet hole 122A and the second outlet hole 122B are circular cross-sections, forming through holes that radially extend from the inner circumferential surface 115 of the housing 110 (cylindrical portion 113) to the refrigerant passage 121, connecting the internal space of the housing 110 and the refrigerant passage 121. The first outlet hole 122A and the second outlet hole 122B allow refrigerant to flow from the refrigerant passage 121 to the coil end 139.

[0044] like Figure 9 As shown, the outermost conductor (inclined portion 147a) constituting the welding coil end 139A is bent circumferentially to one side relative to the slot conductor 137 (leg portion 141a) at the bending portion 146. Furthermore, the outermost conductor (inclined portion 143a) constituting the bent coil end 139B is bent circumferentially to the other side relative to the slot conductor 137 (leg portion 141a) at the bending portion 145.

[0045] In the following description, the bending direction of the outermost conductor of the coil end 139 in the upper part of the stator 130 relative to the inner conductor is referred to as the upper coil bending direction. More specifically, the upper coil bending direction refers to the direction in which the outermost conductor (equivalent to the inner conductor) of the stator 130 is bent relative to the inner conductor when the stator 130 is viewed from above. Figure 7 The inclined portions 143a and 147a of the segmented conductor 140 shown are relative to the conductor inside the slot (equivalent to...) Figure 7 The bending direction of the straight portion of the foot 141a of the segmented conductor 140 shown is the outermost diameter side of the stator coil 138 (see enlarged view) disposed in the slot 133 in the upper part (e.g., the uppermost part) of the stator 130. That is, the bending direction of the upper coil in the welding coil end 139A refers to the bending direction of the inclined portion 147a in the segmented conductor 140 relative to the foot 141a, and the bending direction of the upper coil in the bent coil end 139B refers to the bending direction of the inclined portion 143a in the segmented conductor 140 relative to the foot 141a. Therefore, the bending direction Da of the upper coil in the welding coil end 139A is the left direction shown in the figure, and the bending direction Db of the upper coil in the bent coil end 139B is the right direction shown in the figure. In addition, as Figure 10 As shown, the straight line (vertical line) that is perpendicular to the horizontal and passes through the rotation center axis Ca is taken as the vertical line VL.

[0046] like Figure 9 and Figure 10As shown, the first outlet hole 122A is positioned relative to the vertical line VL on the side of the upper coil bending direction Da (left side of the diagram), and the second outlet hole 122B is positioned relative to the vertical line VL on the side opposite to the upper coil bending direction Da (right side of the diagram). Figure 10 As shown, in a coordinate system with the rotation center axis Ca as the origin, the horizontal line (a line parallel to the horizontal plane) HL passing through the rotation center axis Ca as the X-axis, and the vertical line VL as the Y-axis, the system is divided into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant in a counterclockwise direction (i.e., the circumferential direction in which the outer conductor (inclined portion 147a) is inclined relative to the inner conductor 137 (foot portion 141a) disposed in the fourth layer L4). The first outflow hole 122A is disposed in the second quadrant, and the second outflow hole 122B is disposed in the first quadrant.

[0047] As described above, the outer conductor (inclined portion 147a) protruding from the slot 133 of the stator core 132 bends circumferentially (counterclockwise in the diagram) relative to the inner conductor 137. Refrigerant dripping from the first outlet hole 122A and the second outlet hole 122B to the outermost periphery of the coil end 139 flows along the outermost coil conductor (inclined portion 147a). Therefore, when the first outlet hole 122A and the second outlet hole 122B are arranged symmetrically with respect to the vertical line VL, the adhesion range of the refrigerant relative to the coil end 139 may deviate. Therefore, in this embodiment, by arranging the first outlet hole 122A and the second outlet hole 122B asymmetrically with respect to the vertical line VL, the deviation of the refrigerant adhesion range is reduced.

[0048] like Figure 10 As shown, the first outlet hole 122A and the second outlet hole 122B are formed such that the arrangement angle of the second outlet hole 122B (hereinafter also referred to as the second arrangement angle θb) is larger than the arrangement angle of the first outlet hole 122A (hereinafter also referred to as the first arrangement angle θa) with respect to the vertical line VL. Furthermore, the first arrangement angle θa corresponds to the angle (acute angle) formed by the straight line (segment) La connecting the center of the refrigerant outlet portion of the first outlet hole 122A and the rotation center axis Ca, and the semi-straight line extending upward from the rotation center axis Ca in the vertical line VL. Similarly, the second arrangement angle θb corresponds to the angle (acute angle) formed by the straight line (segment) Lb connecting the center of the refrigerant outlet portion of the second outlet hole 122B and the rotation center axis Ca, and the semi-straight line extending upward from the rotation center axis Ca in the vertical line VL. That is, the closer to the vertical line VL, the smaller the values ​​of the first arrangement angle θa and the second arrangement angle θb.

[0049] In other words, such as Figure 9As shown, the first outlet hole 122A and the second outlet hole 122B are formed such that the horizontal distance Xb between the center of the refrigerant outlet portion of the second outlet hole 122B and the rotation center axis Ca (or vertical line VL) is greater than the horizontal distance Xa between the center of the refrigerant outlet portion of the first outlet hole 122A and the rotation center axis Ca (or vertical line VL).

[0050] like Figure 10 As shown, in this embodiment, the first configuration angle θa is 30 degrees and the second configuration angle θb is 40 degrees. Furthermore, the first configuration angle θa and the second configuration angle θb can be set to various angles depending on the kinematic viscosity of the refrigerant, but it is preferable to set the angle difference Δθ(θb-θa) between the first configuration angle θa and the second configuration angle θb to be at least the slot pitch angle (in this embodiment, 360 / 72 = 5 degrees) or more. Additionally, if the first outlet hole 122A and the second outlet hole 122B are located near the horizontal line HL (X-axis), the upper part of the coil end 139 cannot be effectively cooled; therefore, the first configuration angle θa and the second configuration angle θb are preferably set to 45 degrees or less. Therefore, it is preferable to set the first configuration angle θa and the second configuration angle θb such that the angle difference Δθ between the first configuration angle θa and the second configuration angle θb is 5 degrees or more and 15 degrees or less.

[0051] like Figure 9 As shown, when the stator 130 is viewed from above (directly above), the first outlet hole 122A and the second outlet hole 122B are positioned overlapping the coil end 139. That is, the coil end 139 is positioned on the vertical axis of the refrigerant outlet portion passing through the first outlet hole 122A and the second outlet hole 122B. Furthermore, the first outlet hole 122A and the second outlet hole 122B are formed at a position closer to the end face 132a of the stator core 132 than the axial end of the coil end 139. In other words, the axial distance Z1 from the center of the refrigerant outlet portion of the first outlet hole 122A and the second outlet hole 122B to the end face 132a of the stator core 132 is shorter than the axial distance Z2 from the center of the refrigerant outlet portion of the first outlet hole 122A and the second outlet hole 122B to the axial end of the coil end 139 (Z1 < Z2). Furthermore, at the welding coil end 139A, the axial distance Z2 is the distance between the center of the refrigerant outlet portion of the first outlet hole 122A and the second outlet hole 122B and the top end of the end 140e. At the bent coil end 139B, the axial distance Z2 is the distance between the center of the refrigerant outlet portion of the first outlet hole 122A and the second outlet hole 122B and the top end of the bent portion 144. In this way, by forming the first outlet hole 122A and the second outlet hole 122B close to the stator core 132, not only can the coil end 139 be effectively cooled by the refrigerant, but the end face 132a of the stator core 132 can also be effectively cooled.

[0052] Figure 11A This is a diagram showing the adhesion range of the refrigerant to the welding coil end 139A of the rotary motor 100 in this embodiment. Figure 11B This is a diagram showing the adhesion range of the refrigerant to the welding coil end 139A of the rotary motor 900 in the comparative example of this embodiment. Additionally, Figure 11A and Figure 11B This is a side view of the rotary motor at the end 139A of the welding coil, viewed from the axial direction. The only difference between the rotary motor 900 of this comparative example and the rotary motor 100 of this embodiment is the position of the second outlet hole 922B. In the rotary motor 900 of the comparative example, the first outlet hole 122A and the second outlet hole 922B are symmetrically arranged with respect to the vertical line VL.

[0053] exist Figure 11A and Figure 11B In the diagram, the shaded areas (slanted areas) schematically represent the ranges without adhering refrigerant, i.e., the non-adhering ranges 191, 192, 991, and 992, obtained from computer simulations conducted under the same conditions. For example... Figure 11A and Figure 11B As shown, simulation confirmed that non-adhesion ranges 191, 192, 991, and 992 exist on the upper and side portions (right side of the diagram) of the coil end 139 in both rotary motor 100 and rotary motor 900. That is, it was confirmed that, compared to the left portion of the coil end 139 in the diagram, the refrigerant adhesion range on the right side of the diagram in both rotary motor 100 and rotary motor 900 is smaller, indicating a deviation in the refrigerant adhesion range on the left and right sides of the coil end 139.

[0054] In this embodiment, the non-adhesion range 191 at the upper part of the welding coil end 139A is larger than the non-adhesion range 991 at the upper part of the welding coil end 139A in the comparative example. However, the non-adhesion range 192 at the side part of the welding coil end 139A in this embodiment is smaller than the non-adhesion range 992 at the side part of the welding coil end 139A in the comparative example. Furthermore, the difference between the non-adhesion range 191 and the non-adhesion range 991 at the upper part of the coil end 139 is greater than the difference between the non-adhesion range 192 and the non-adhesion range 992 at the side part of the coil end 139. Therefore, the total non-adhesion area of ​​the rotary motor 100 in this embodiment is smaller than the total non-adhesion area of ​​the rotary motor 900 in the comparative example.

[0055] In this embodiment, simulation confirmed that the total adhesion range of the refrigerant to the coil end 139 of the rotary motor 100 is increased by about 20% compared to the total adhesion range of the refrigerant to the coil end 139 of the rotary motor 900.

[0056] like Figure 9As shown, because the bending direction Da of the upper coil at the welding coil end 139A is to the left, the refrigerant dripping onto the welding coil end 139A tends to flow to the left. Therefore, as Figure 11B As shown, in a rotary motor 900 with a first outlet hole 122A and a second outlet hole 922B arranged symmetrically with respect to the vertical line VL, the refrigerant flowing out from the second outlet hole 922B tends to flow to the left along the outermost conductor of the welding coil end 139A, and the non-adhesion range 992 on the right side becomes larger (see reference). Figure 11A That is, in the comparative example, with the vertical line VL as the reference, the area on the opposite side of the bending direction Da of the upper coil is smaller than the area on the side where the refrigerant adheres to the upper coil, and the area on the left and right has a large deviation in the adhesion range.

[0057] In contrast, in this embodiment, compared to the comparative example, the second outflow hole 122B is positioned offset from the first outflow hole 122A at a position symmetrical to the vertical line VL, in the opposite direction to the bending direction Da of the upper coil (i.e., the direction guiding the refrigerant). Therefore, the non-adhesion area 192 on the right side of the welding coil end 139A can be reduced, and the deviation in the refrigerant adhesion area on the left and right sides of the welding coil end 139A can be suppressed compared to the comparative example. Thus, according to this embodiment, the overall adhesion area of ​​the refrigerant to the welding coil end 139A can be increased, and the welding coil end 139A can be effectively cooled.

[0058] Although the description uses the welding coil end 139A as an example, the first outlet hole 122A and the second outlet hole 122B, which drip refrigerant to the bent coil end 139B, also have the same configuration. Furthermore, as... Figure 9 As shown, the bending direction Db of the upper coil in the bent coil end 139B is to the right, which is opposite to the bending direction Da of the upper coil in the welding coil end 139A. Therefore, when the rotary motor 100 is viewed from above, the first outlet hole 122A and the second outlet hole 122B on the bent coil end 139B side are configured in a configuration that is the left-right opposite to that on the welding coil end 139A side.

[0059] According to the above implementation method, the following effects are achieved.

[0060] (1) The rotary electric motor 100 includes: a rotor 150 arranged horizontally with its rotational central axis Ca; a stator 130 arranged radially on the rotor 150 with a gap; and a housing 110 supporting the stator 130 and forming a refrigerant passage (flow path) 121 for refrigerant flow. The stator 130 includes a stator core 132 having a plurality of slots 133 and stator coils 138 mounted on the stator core 132. The stator coils 138 have slot conductors 137 disposed within the slots 133 of the stator core 132 and coil ends (outer slot conductors) 139 disposed outside the slots. The housing 110 forms a first outflow hole 122A and a second outflow hole 122B for refrigerant to flow out to the coil ends (outer slot conductors) 139. With the housing 110 in place, the first outlet hole 122A and the second outlet hole 122B are positioned above the coil end (outer conductor) 139. The bending direction of the coil end (outer conductor) 139 relative to the outermost diameter side of the slot conductor 137 disposed in the slot 133 of the stator coil 138 disposed in the upper part of the stator 130 is taken as the bending direction of the upper coil. A straight line that is perpendicular to the horizontal and passes through the rotation center axis Ca is taken as the vertical line VL. The first outlet hole 122A is positioned relative to the vertical line VL on the side of the bending direction of the upper coil, and the second outlet hole 122B is positioned relative to the vertical line VL on the side opposite to the bending direction of the upper coil. The first outlet hole 122A and the second outlet hole 122B are formed such that the angle formed by the straight line La connecting the first outlet hole 122A and the rotation center axis Ca and the vertical line VL, i.e., the first configuration angle θa, is larger than the angle formed by the straight line La connecting the first outlet hole 122A and the rotation center axis Ca and the vertical line VL, i.e., the second configuration angle θb.

[0061] Thus, in this embodiment, the second outlet hole 122B is positioned offset from the first outlet hole 122A at a position symmetrical to the vertical line VL, in the opposite direction to the bending direction of the upper coil (i.e., the direction guiding the refrigerant) Da and Db. Therefore, the adhesion range on the side opposite to the bending direction Da and Db of the upper coil in the coil end 139 can be increased. This suppresses the deviation of the refrigerant adhesion range to the left and right sides of the coil end 139 based on the vertical line VL, increases the overall adhesion area of ​​the refrigerant to the coil end 139, and effectively cools the stator coil 138. According to this embodiment, by improving cooling performance, the supply current to the stator coil 138 can be increased, thereby improving the output and efficiency of the rotary motor 100.

[0062] (2) The first outlet hole 122A and the second outlet hole 122B are formed at positions closer to the end face 132a of the stator core 132 than the axial end of the coil end (outer conductor) 139. By configuring the first outlet hole 122A and the second outlet hole 122B closer to the stator core 132 than the axial end of the coil end 139, the coil end 139 can be cooled while the end face 132a of the stator core 132 is cooled. That is, according to this configuration, the end of the stator core 132 can be effectively cooled.

[0063] (3) The refrigerant has a dynamic viscosity of 4-24 mm at 100℃. 2 The oil is [ / s]. Therefore, by directly cooling the coil end 139 while suppressing corrosion of the coil end 139, the stator coil 138 can be effectively cooled.

[0064] (4) The angle difference Δθ between the first configuration angle θa and the second configuration angle θb is 5 degrees or more and 15 degrees or less. As a result, the reduction of the refrigerant adhesion range on the upper part of the coil end 139 can be suppressed, and the refrigerant adhesion range on the side of the coil end 139 can be effectively increased.

[0065] The following variations are also within the scope of the present invention. The configurations shown in the variations can be combined with the configurations described in the above embodiments, or the configurations described in the following different variations can be combined with each other.

[0066] <Variation Example 1> In the above embodiment, an example was described where the first outlet hole 122A and the second outlet hole 122B are formed near the end face 132a of the stator core 132, but they can also be formed near the axial end of the coil end 139. Furthermore, as described above, by forming the first outlet hole 122A and the second outlet hole 122B near the end face 132a of the stator core 132, the coil end 139 and the end face 132a of the stator core 132 can be directly cooled by the refrigerant, which is therefore preferable.

[0067] <Variation Example 2> In the above embodiments, an example was described where the cross-sectional shape (the shape of the flow path cross-section orthogonal to the refrigerant flow) of the first outlet orifice 122A and the second outlet orifice 122B is circular, but the present invention is not limited thereto. For example, the cross-sectional shape of the first outlet orifice 122A and the second outlet orifice 122B may be elliptical, polygonal, or irregular.

[0068] <Variation Example 3> In the above embodiment, an example of a flat wire with a rectangular cross-sectional shape for the stator coil 138 has been described, but the present invention is not limited thereto. The cross-sectional shape of the stator coil 138 can be a polygon such as a triangle or pentagon, a circle, an ellipse, or an irregular shape.

[0069] <Variation Example 4> In the above embodiments, an example was described in which a first outlet hole 122A and a second outlet hole 122B are respectively provided on one axial end side (the side of the bent coil end 139B) and the other axial end side (the side of the welding coil end 139A) of the housing body 112, but the present invention is not limited thereto. The first outlet hole 122A and the second outlet hole 122B may be provided only on one axial end side (the side of the bent coil end 139B) of the housing body 112, or the first outlet hole 122A and the second outlet hole 122B may be provided only on the other axial end side (the side of the welding coil end 139A) of the housing body 112.

[0070] <Variation Example 5> The configuration of segmented conductor 140 (refer to...) Figure 8 The configuration is not limited to that described in the above embodiments. Furthermore, the number of slots 133 in the stator core 132 is not limited to the number described in the above embodiments.

[0071] <Variation Example 6> In the above embodiments, an example of forming four layers L1, L2, L3, and L4 in the slot 133 was described, but the present invention is not limited thereto. For example, the present invention can be applied to a rotating electric motor having a stator having two layers formed in the slot 133 or a stator having six or more layers formed.

[0072] <Variation Example 7> In the above embodiments, an example of stator coil 138 being wound on stator core 132 in a wave-like winding manner was described, but the present invention is not limited thereto. The present invention can also be applied to rotary motors in which stator coil 138 is wound on stator core 132 in an overlapping winding manner.

[0073] <Variation Example 8> In the above embodiments, an example of the rotary motor 100 being mounted on a vehicle has been described, but the present invention is not limited thereto. The present invention can be applied when the rotary motor 100 is mounted on a machine with its rotation center axis Ca horizontal.

[0074] The embodiments of the present invention have been described above, but the above embodiments only show a part of the application examples of the present invention, and the technical scope of the present invention is not limited to the specific configuration of the above embodiments. Symbol Explanation

[0075] 100… Rotary motor, 110… Housing, 112… Housing body, 113… Cylindrical section, 121… Refrigerant passage (flow path), 122A… First outlet hole, 122B… Second outlet hole, 130… Stator, 132… Stator core, 132a… End face of stator core, 133… Slot, 137… Slot conductor, 138… Stator coil, 139… Coil end (outer conductor), 139A… Welded coil end, 139B… Bent coil end Part, 140…segmented conductor, 150…rotor, 152…rotor core, 153…refrigerant passage, Ca…rotation center shaft, Da…bending direction of the upper coil at the end of the welded coil, Db…bending direction of the upper coil at the end of the bent coil, HL…horizontal line, L1…first layer, L2…second layer, L3…third layer, L4…fourth layer, TM…gearbox, VL…vertical line, θa…first configuration angle, θb…second configuration angle, Δθ…angle difference.

Claims

1. A rotary electric motor, characterized in that, have: The rotor is configured such that its central axis of rotation is horizontal. The stator, which is arranged radially with a gap in the rotor; and The housing supports the stator and forms a flow path for the refrigerant to flow. The stator includes a stator core with multiple slots and stator coils mounted on the stator core. The stator coil includes in-slot conductors disposed within the slots of the stator core and out-of-slot conductors disposed outside the slots. The housing forms a first outflow hole and a second outflow hole that allow refrigerant to flow out toward the outer conductor of the tank. With the housing in place, The first outflow hole and the second outflow hole are disposed above the outer conductor of the groove. The bending direction of the outer conductor relative to the inner conductor of the stator coil disposed in the slot on the outermost diameter side of the slot in the upper part of the stator is taken as the bending direction of the upper coil, and a straight line that is perpendicular to the horizontal and passes through the rotation center axis is taken as the vertical line. The first outlet hole is positioned relative to the vertical line on the side of the upper coil bending direction. The second outlet hole is positioned on the side opposite to the bending direction of the upper coil relative to the vertical line. The first outlet hole and the second outlet hole are formed such that the angle between the straight line connecting the first outlet hole and the rotation center axis and the vertical line, i.e., the second configuration angle, is larger than the first configuration angle.

2. The rotary motor according to claim 1, characterized in that, The first outlet hole and the second outlet hole are formed at a position closer to the end face of the stator core than the axial end of the outer conductor of the slot.

3. The rotary motor according to claim 1, characterized in that, The refrigerant has a kinematic viscosity of 4–24 mm at 100°C. 2 / s of oil.

4. The rotary motor according to claim 1, characterized in that, The angle difference between the first configuration angle and the second configuration angle is more than 5 degrees and less than 15 degrees.

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