JP2020120486A - Rotary electric machine - Google Patents

Abstract

To provide a rotary electric machine which suppresses immersion of coolant into an air gap and in which the cooling efficiency of a stator is improved.SOLUTION: A rotary electric machine comprises: a rotor 4 which has a rotor core 12, a permanent magnet, and an end face plate 14 which is arranged so that an inside face contacts an end face of the rotor core 12; a stator 3 which has a coil, and arranged on an outer peripheral side of the rotor 4 to face the rotor 4; and a case which accommodates the rotor 4 and the stator 3. An axial direction of the end face plate 14 crosses a horizontal direction, a liquid guide part 43 which extends in a radial direction while curving is provided on an outside face of the end face plate 14 (first end face plate 41) located on a vertical upper side, a projection start end 46 of the liquid guide part 43 is located from an upstream side to a downstream side in a rotation direction CCW of the rotor 4 as going from the inside in the radial direction to the outside in the radial direction, and inclination of a circular arc part 45 connecting the projection start end 46 with a projection peak part 47 to the axial direction gradually increases.SELECTED DRAWING: Figure 2

Description

The present invention relates to a rotary electric machine.

Conventionally, various techniques for efficiently cooling a stator and a rotor of a rotary electric machine have been proposed.

For example, Patent Document 1 describes a configuration in which a rotor includes an end face plate, and the end face plate is provided with a liquid guide portion that extends in a radial direction on an outer side surface. According to the technique described in Patent Document 1, the liquid is guided by the liquid guide portion of the end face plate by the rotation of the rotor, and is scattered by the centrifugal force, whereby the coil located on the outer peripheral side of the rotor can be cooled.

JP, 2018-68087, A

However, in the technique described in Patent Document 1, particularly when applied to a horizontally placed rotor, there is a possibility that the refrigerant guided to the outer peripheral portion of the rotor may enter the air gap during low rotation. This may lead to an increase in friction and a reduction in stator cooling efficiency.

Therefore, an object of the present invention is to provide a rotating electric machine that suppresses the infiltration of the refrigerant into the air gap and improves the cooling efficiency of the stator.

In order to solve the above problems, a rotating electric machine according to the invention of claim 1 (for example, the rotating electric machine 1 in the first embodiment) includes a rotor core (for example, the rotor core 12 in the first embodiment) and the rotor core. A plurality of permanent magnets (for example, the permanent magnet 13 in the first embodiment) that are arranged, and an end face plate (for example, the end face plate 14 in the first embodiment) that is arranged so that the inner surface contacts the end face of the rotor core. And a rotor (for example, the rotor 4 in the first embodiment), a stator core (for example, the stator core 31 in the first embodiment), and a coil arranged in the stator core (for example, the coil 33 in the first embodiment). And a stator (for example, the stator 3 in the first embodiment) arranged on the outer peripheral side of the rotor so as to face the rotor, and a case (for example, the first stator) that accommodates the rotor and the stator. The case 2) in the embodiment, and the axial direction of the end face plate intersects the horizontal direction, and is outside the end face plate (for example, the first end face plate 41 in the first embodiment) located on the vertically upper side. A liquid guide portion (for example, the liquid guide portion 43 in the first embodiment) that curves and extends in the radial direction is provided on the side surface, and a projection start end portion of the liquid guide portion (for example, a projection start portion in the first embodiment). The end portion 46) is located from the upstream side to the downstream side in the rotation direction of the rotor (for example, the rotation direction CCW in the first embodiment) from the radially inner side toward the radially outer side, and the projection start end portion It is characterized in that the inclination of the arc portion (for example, the arc portion 45 in the first embodiment) that connects the projection and the projection top (for example, the projection top 47 in the first embodiment) with respect to the axial direction gradually increases. There is.

Further, the rotary electric machine according to the invention described in claim 2 is characterized in that, in the liquid guide portion, the arc length of the arc portion gradually increases from the radially inner side toward the radially outer side.

Further, the rotary electric machine according to the invention described in claim 3 is characterized in that the liquid guide portion gradually increases in height in the axial direction from the radially inner side toward the radially outer side.

Further, in the rotating electrical machine according to the invention described in claim 4, in the circumferential direction of the rotor, the protrusion start end portion located on the innermost diameter side of the liquid guide portion (for example, the inner protrusion start end in the second embodiment. The length from the portion 246b) to the projection start end located on the outermost diameter side (for example, the outer projection start end 246a in the second embodiment) is the maximum from the projection start end located on the innermost diameter side. It is characterized in that it is formed so as to have a length equal to that of the protrusion tops located on the outer diameter side (for example, the outer protrusion tops 247a in the second embodiment).

Further, the rotary electric machine according to a fifth aspect of the invention is characterized in that the liquid guide portions are arranged at equal intervals in the circumferential direction of the rotor.

Further, the rotating electrical machine according to a sixth aspect of the invention is characterized in that the end face plate is arranged so that the axial direction of the end face plate and the direction of gravity coincide with each other.

According to the rotating electric machine of claim 1 of the present invention, since the liquid guide portion is provided on the end face plate located on the vertically upper side, the refrigerant dripped on the end face plate is subjected to the liquid guide portion by centrifugal force. Move radially outward along. Since the liquid guide portion extends in the radial direction while curving, the contact area between the refrigerant and the liquid guide portion can be increased as compared with the conventional technique in which the liquid guide portion is linearly formed. As a result, the refrigerant on the upper surface of the rotor can be reliably captured by the liquid guide portion even when the rotation speed is low. Therefore, the refrigerant can be efficiently guided to the outer peripheral portion of the rotor even at the time of low rotation.
The projection start end portion of the liquid guide portion is located from the upstream side to the downstream side in the rotation direction of the rotor as it goes from the radially inner side to the radially outer side, and the arc portion connecting the projection start end portion and the projection top portion. The inclination of the with respect to the axial direction gradually increases. In this way, since the liquid guide portion is curved in the axial direction, it is possible to scoop up the refrigerant by the liquid guide portion and disperse the refrigerant in the axial direction. This can prevent the refrigerant from entering the air gap and increasing friction. Further, the inclination of the arcuate portion with respect to the axial direction gradually increases from the radially inner side toward the radially outer side, so that the refrigerant is accelerated in the axial direction toward the radially outer side. As a result, the refrigerant is scattered outward in the axial direction and the radial direction at the outer peripheral portion of the rotor. Therefore, the coolant can be efficiently supplied to the stator by jumping over the air gap.
Therefore, it is possible to provide a rotating electric machine that suppresses the intrusion of the refrigerant into the air gap and improves the cooling efficiency of the stator.

According to the rotating electric machine of claim 2 of the present invention, the arc length of the arc portion gradually increases from the radially inner side toward the radially outer side. The contact area with is increased. As a result, a large amount of the refrigerant can be scattered in the axial direction on the radially outer side of the liquid guide portion. Therefore, the refrigerant can be reliably supplied to the stator.

According to the rotating electric machine of claim 3 of the present invention, the height of the liquid guide portion gradually increases from the radially inner side toward the radially outer side, so that the arcuate portion of the arc guide portion becomes radially outward. Easy to increase the area. Further, the height in the axial direction increases as it goes outward in the radial direction, so that the refrigerant is easily scattered in the axial direction. As a result, a large amount of the refrigerant can be scattered in the axial direction on the radially outer side of the liquid guide portion. Therefore, the refrigerant can be reliably supplied to the stator.

According to the rotating electrical machine of claim 4 of the present invention, the length from the projection start end located on the innermost diameter side of the liquid guide portion to the projection start end located on the outermost diameter side is the innermost diameter side. It is equal to the length from the start end of the protrusion located at the top to the top of the protrusion located on the outermost diameter side. As a result, the refrigerant on the radially inner side can be easily scooped up at the time of low rotation. Therefore, the movement of the refrigerant can be promoted and the cooling efficiency can be improved.

According to the rotating electric machine of the fifth aspect of the present invention, since the liquid guide portions are arranged at equal intervals in the circumferential direction, it is possible to suppress imbalance during rotation of the rotor. Further, the amount of refrigerant supplied from the rotor to the stator can be made uniform in the circumferential direction.

According to the rotating electric machine of the sixth aspect of the present invention, the end face plate is arranged so that the axial direction of the end face plate and the gravity direction coincide with each other. In other words, the rotary electric machine includes a horizontal rotor. As a result, particularly in a horizontally placed rotor, it is possible to suppress the refrigerant guided to the outer peripheral portion of the rotor from entering the air gap during low rotation, and to improve the cooling efficiency of the stator.
Therefore, it is possible to provide a rotating electric machine that suppresses the intrusion of the refrigerant into the air gap and improves the cooling efficiency of the stator.

The schematic sectional drawing of the rotary electric machine which concerns on 1st Embodiment. FIG. 3 is a perspective view of the rotor according to the first embodiment. The III section enlarged view of FIG. The top view of the 1st end face plate which concerns on 1st Embodiment. Sectional drawing which follows the VV line of FIG. The elements on larger scale of the 1st end face plate concerning 2nd Embodiment. The top view of the 1st end face plate which concerns on 2nd Embodiment. Sectional drawing which follows the VIII-VIII line of FIG. Sectional drawing which follows the IX-IX line of FIG. Explanatory drawing which overlapped FIG. 8 and FIG. The perspective view of the rotor which concerns on a prior art.

Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
(Rotary electric machine)
FIG. 1 is a schematic cross-sectional view of a rotary electric machine 1 according to the embodiment. The rotary electric machine 1 is mounted in a vehicle such as a hybrid vehicle or an electric vehicle. However, the configuration of the rotary electric machine 1 of the present invention is not limited to the traveling motor, and can be applied to a power generation motor, a motor for other purposes, and a rotary electric machine (including a generator) other than for a vehicle.

The rotary electric machine 1 includes a case 2, a stator 3, and a rotor 4.
The case 2 houses the stator 3 and the rotor 4. The refrigerant S is housed inside the case 2. The stator 3 and the rotor 4 described above are arranged inside the case 2 in a state of being partially immersed in the refrigerant S. As the refrigerant, ATF (Automatic Transmission Fluid), which is a hydraulic oil used for lubrication of a transmission, power transmission, or the like, is preferably used.
In the following description, a direction along the axis C of the rotating shaft 11 in the rotor 4 may be simply referred to as an axial direction, a direction orthogonal to the axis C may be referred to as a radial direction, and a direction around the axis C may be referred to as a circumferential direction. In the present embodiment, the axial direction and the vertical up and down direction match.

The stator 3 is fixed to the inner wall surface of the case 2. The stator 3 is formed in an annular shape. The stator 3 has a stator core 31 and a coil 33.
The stator core 31 is a laminated core formed by laminating a plurality of steel plates in the axial direction. The stator core 31 is formed in an annular shape around the axis C. The outer peripheral portion of the stator core 31 is fixed to the inner wall surface of the case 2. The stator core 31 has teeth (not shown) protruding radially inward from the inner peripheral portion of the stator core 31. A plurality of teeth are provided in the circumferential direction. Slots (not shown) are provided between the teeth.

The coil 33 is inserted into the slot of the stator core 31. The coil 33 is attached to the stator core 31 by, for example, inserting a plurality of copper wire segments into the slots. The coil 33 has a coil insertion portion 34 that is inserted into a slot of the stator core 31, and coil ends 35 that project from the stator core 31 to both sides in the axial direction.

(Rotor)
The rotor 4 is arranged radially inside the stator 3 with a gap. The rotor 4 is configured to be rotatable around the axis C. The rotor 4 has a rotating shaft 11, a rotor core 12, a permanent magnet 13, and an end face plate 14.

The rotating shaft 11 is formed in a tubular shape centering on the axis C. The rotating shaft 11 is rotatably supported by the case 2 via a bearing 21 attached to the case 2.

The rotor core 12 is provided on the outer peripheral portion of the rotating shaft 11. The rotor core 12 is formed in an annular shape. The rotor core 12 is configured to be rotatable around the axis C integrally with the rotary shaft 11.

The permanent magnet 13 is arranged on the outer peripheral portion of the rotor core 12. The permanent magnet 13 extends, for example, inside the rotor core 12 along the axial direction. A plurality of permanent magnets 13 are formed at intervals in the circumferential direction. The permanent magnet 13 is, for example, a rare earth magnet. Examples of rare earth magnets include neodymium magnets, samarium cobalt magnets and praseodymium magnets.

(End plate)
FIG. 2 is a perspective view of the rotor 4 according to the embodiment. The vertical direction in FIG. 2 corresponds to the vertical direction in FIG. CCW in the figure indicates the rotation direction of the rotor 4.
The end face plate 14 covers the end face of the rotor core 12 in the axial direction. The end face plate 14 is arranged such that the inner side face thereof contacts the end face of the rotor core 12. The end face plate 14 has a first end face plate 41 and a second end face plate 42.

The first end face plate 41 covers an end face on the vertically upper side (upper side in FIG. 2) of the end faces of the rotor core 12. The first end face plate 41 is formed in an annular shape. The radially inner end and the radially outer end of the first end face plate 41 are flush with the radially inner end and the radially outer end of the rotor core 12. A liquid guide portion 43 is provided on the outer side surface 49 of the first end face plate 41.

FIG. 3 is an enlarged view of part III in FIG. FIG. 4 is a top view of the first end face plate 41 according to the embodiment.
As shown in FIG. 3, the liquid guide portion 43 extends in the radial direction. The liquid guide portion 43 projects vertically upward from the outer surface 49 of the first end face plate 41. The height of the liquid guide portion 43 in the axial direction gradually increases from the radially inner side toward the radially outer side. The liquid guide portion 43 is formed in a trapezoidal cross section by the first wall surface 17, the second wall surface 18, and the third wall surface 19.

The first wall surface 17 is a surface facing the upstream side in the rotation direction CCW of the rotor 4. The first wall surface 17 is provided at a substantially right angle to the outer side surface 49. The axial height dimension of the first wall surface 17 gradually increases from the radially inner side toward the radially outer side.
The second wall surface 18 is a surface facing the downstream side in the rotation direction CCW of the rotor 4. The second wall surface 18 has an arc portion 45. The axial height dimension of the second wall surface 18 gradually increases from the radially inner side toward the radially outer side.
The third wall surface 19 connects the first wall surface 17 and the second wall surface 18. The width dimension in the circumferential direction of the third wall surface 19 gradually decreases from the radially inner side toward the radially outer side.

As shown in FIG. 4, in the top view seen from the axial direction, the liquid guide portion 43 is curved so as to be convex on one side in the circumferential direction. Specifically, the liquid guide portion 43 is curved so as to be convex on the upstream side in the rotation direction CCW of the rotor 4. A plurality of liquid guide portions 43 (12 in this embodiment) are arranged at equal intervals in the circumferential direction of the rotor 4.

The liquid guide portion 43 has an arc portion 45, a protrusion start end portion 46, and a protrusion top portion 47.
As shown in FIG. 3, the arc portion 45 is provided on the second wall surface 18. In the present embodiment, the entire surface of the second wall surface 18 is an arc portion 45. The circular arc portion 45 has an arcuate shape that is convex on the upstream side in the rotation direction CCW of the rotor 4. The arc length of the arc portion 45 gradually increases from the radially inner side toward the radially outer side. The inclination of the arc portion 45 with respect to the axial direction is formed so as to gradually increase from the radially inner side toward the radially outer side.

The projection start end portion 46 is a boundary portion between the second wall surface 18 and the outer side surface 49. In the present embodiment, the projection start end portion 46 is a boundary portion between the circular arc portion 45 and the outer side surface 49. The projection start end portion 46 is located from the upstream side to the downstream side in the rotation direction CCW of the rotor 4 as it goes from the radially inner side to the radially outer side. Here, the projection start end portion 46 located on the outer side in the radial direction is defined as the outer projection start end portion 46a (see FIG. 5). Further, the projection start end portion 46 located on the radially inner side is defined as the inner projection start end portion 46b (see FIG. 5).

The protrusion top 47 is defined as a boundary between the second wall surface 18 and the third wall surface 19. In the present embodiment, the protrusion top portion 47 is a boundary portion between the arc portion 45 and the third wall surface 19. As shown in FIG. 3, on the innermost diameter side of the liquid guide portion 43, the projection top portion 47 coincides with the projection start end portion 46.

FIG. 5 is a sectional view taken along the line VV of FIG. A point 46b (46) in FIG. 5 is an inner protrusion start in a state where the first wall surface 17 on the innermost diameter side of the liquid guide portion 43 and the first wall surface 17 on the outermost diameter side of the liquid guide portion 43 are aligned with each other. The position of the end portion 46b is shown.
As shown in FIG. 5, the outer protrusion start end portion 46 a located on the outermost diameter side of the liquid guide portion 43 is arranged in the circumferential direction more than the inner protrusion start end portion 46 b located on the innermost diameter side of the liquid guide portion 43. It is located on the downstream side in the rotation direction CCW of the rotor 4. The projection top 47 located on the outermost diameter side of the liquid guide portion 43 is located upstream of the inner projection start end portion 46b in the circumferential direction in the rotation direction CCW of the rotor 4.
In the circumferential direction, from the projection start end portion 46 located on the innermost diameter side of the liquid guide portion 43 (more specifically, the inner projection start end portion 46b), the projection start end portion 46 located on the outermost diameter side (more concretely). Specifically, the length L1 up to the outer projection start end 46a) is equal to the length L2 from the inner projection start end 46b located on the innermost diameter side to the projection top 47 located on the outermost diameter side. Is formed.

Returning to FIG. 2, the second end face plate 42 covers the end face on the vertically lower side (the lower side in FIG. 2) of the end faces of the rotor core 12. The second end face plate 42 is formed in an annular shape. The radially inner end and the radially outer end of the second end face plate 42 are flush with the radially inner end and the radially outer end of the rotor core 12. In the present embodiment, the second end face plate 42 is formed in a flat plate shape, for example.

(Action, effect)
Next, the operation and effect of the rotary electric machine 1 will be described.
Here, FIG. 11 is a perspective view of the rotor 104 according to the related art.
As shown in FIG. 11, the conventional rotor 104 has a rotor core 112 and an end face plate 114. The end face plate 114 has a first end face plate 141 and a second end face plate 142. A liquid guide portion 143 is provided on the first end face plate 141. The liquid guide portion 143 is formed to have a rectangular cross section and linearly extend in the radial direction.
As described above, in the conventional technique in which the liquid guide portion 143 is formed to have a rectangular cross section and linearly extends in the radial direction, there is a possibility that the refrigerant cannot be reliably guided to the outer peripheral portion when the rotor 104 rotates at a low speed. Further, even when guided to the outer peripheral portion of the rotor 104, the centrifugal force is small at the time of low rotation, so that the refrigerant may travel along the outer peripheral portion of the rotor 104 and enter the air gap. When the refrigerant enters the air gap, friction occurs between the stator (not shown) and the rotor 104. As a result, the performance of the rotary electric machine 1 may be deteriorated. Further, when the rotor 104 is horizontally placed and used such that the axial direction of the rotor 104 and the vertical direction are aligned with each other, the cooling medium may not be sufficiently supplied to the stator, which may reduce the cooling efficiency of the stator.

According to the rotary electric machine 1 of the present embodiment, since the end face plate 14 (first end face plate 41) located on the vertically upper side is provided with the liquid guide portion 43, the end face plate 14 (first end face plate 41). The refrigerant dripped onto the radial direction moves radially outward along the liquid guide portion 43. Since the liquid guide portion 43 is curved and extends in the radial direction, the contact area between the refrigerant and the liquid guide portion 43 can be increased as compared with the conventional technique in which the liquid guide portion 43 is formed in a straight line. .. As a result, the refrigerant on the upper surface of the rotor 4 can be reliably captured by the liquid guide portion 43 even when the rotation speed is low. Therefore, the refrigerant can be efficiently guided to the outer peripheral portion of the rotor 4 even when the rotation speed is low.
The protrusion start end portion 46 of the liquid guide portion 43 is located from the upstream side to the downstream side in the rotation direction of the rotor 4 as it goes from the radially inner side to the radially outer side, and the protrusion start end portion 46 and the protrusion top portion 47 are provided. The inclination of the circular arc portion 45 connecting with respect to the axial direction gradually increases. In this way, since the liquid guide portion 43 is curved in the axial direction, it is possible to scoop up the refrigerant by the liquid guide portion 43 to scatter the refrigerant in the axial direction. This can prevent the refrigerant from entering the air gap and increasing friction. Furthermore, the inclination of the arc portion 45 with respect to the axial direction gradually increases from the radially inner side toward the radially outer side, so that the refrigerant is accelerated in the axial direction toward the radially outer side. As a result, the refrigerant is scattered outward in the axial direction and the radial direction on the outer peripheral portion of the rotor 4. Therefore, the refrigerant can be efficiently supplied to the stator 3 by jumping over the air gap.
Therefore, it is possible to provide the rotary electric machine 1 in which the refrigerant is prevented from entering the air gap and the cooling efficiency of the stator 3 is improved.

The length of the arc of the arc portion 45 gradually increases from the inner side in the radial direction toward the outer side in the radial direction, so that the contact area between the arc portion 45 and the refrigerant increases on the outer side in the radial direction. As a result, a large amount of the refrigerant can be scattered in the axial direction outside the liquid guide portion 43 in the radial direction. Therefore, the refrigerant can be reliably supplied to the stator 3.

Since the height of the liquid guide portion 43 gradually increases from the inner side in the radial direction toward the outer side in the radial direction, it is easy to increase the area of the arc portion 45 along the outer side in the radial direction. Further, the height in the axial direction increases as it goes outward in the radial direction, so that the refrigerant is easily scattered in the axial direction. As a result, a large amount of the refrigerant can be scattered in the axial direction outside the liquid guide portion 43 in the radial direction. Therefore, the refrigerant can be reliably supplied to the stator 3.

The length from the projection start end portion 46 (inner projection start end portion 46b) located on the innermost diameter side of the liquid guide portion 43 to the projection start end portion 46 (outer projection start end portion 46a) located on the outermost diameter side is The length is equal to the length from the projection start end portion 46 (inner projection start end portion 46b) located on the innermost diameter side to the projection top 47 located on the outermost diameter side. As a result, the refrigerant on the radially inner side can be easily scooped up at the time of low rotation. Therefore, the movement of the refrigerant can be promoted and the cooling efficiency can be improved.

Since the liquid guide portions 43 are arranged at equal intervals in the circumferential direction, it is possible to suppress the occurrence of imbalance during rotation of the rotor 4. Further, the amount of refrigerant supplied from the rotor 4 to the stator 3 can be made uniform in the circumferential direction.

The end plate 14 is arranged so that the axial direction of the end plate 14 and the direction of gravity coincide with each other. In other words, the rotary electric machine 1 includes the horizontal rotor 4. As a result, particularly in the horizontally placed rotor 4, it is possible to suppress the refrigerant guided to the outer peripheral portion of the rotor 4 from entering the air gap at the time of low rotation, and improve the cooling efficiency of the stator 3.
Therefore, it is possible to provide the rotary electric machine 1 in which the refrigerant is prevented from entering the air gap and the cooling efficiency of the stator 3 is improved.

(Second embodiment)
Next, a second embodiment according to the present invention will be described. FIG. 6 is a partially enlarged view of the first end face plate 241 according to the second embodiment. FIG. 7 is a top view of the first end face plate 241 according to the second embodiment. 8 is a sectional view taken along the line VIII-VIII of FIG. 7, and FIG. 9 is a sectional view taken along the line IX-IX of FIG. 7. FIG. 10 is an explanatory diagram in which FIG. 8 and FIG. 9 are overlapped. The present embodiment differs from the above-described embodiments in that the height of the liquid guide portion 43 in the axial direction is constant.

As shown in FIG. 6, in the present embodiment, the liquid guide portion 243 is formed by the first wall surface 217, the second wall surface 218, and the third wall surface 219 into a trapezoidal cross section and a rectangular cross section. Specifically, the liquid guide portion 243 has a rectangular cross section on the innermost diameter side, and a trapezoidal cross section on portions other than the innermost diameter side. The height of the liquid guide portion 243 in the axial direction is formed to be constant.

The first wall surface 217 is formed so that the height in the axial direction becomes constant as it goes from the radially inner side to the radially outer side.
The second wall surface 218 has a straight line portion 244 and a circular arc portion 245. As shown in FIG. 9, the linear portion 244 is provided on the innermost diameter side of the liquid guide portion 243. The straight line portion 244 is formed in a straight line substantially perpendicular to the outer side surface 249. As shown in FIG. 6, the circular arc portion 245 is provided on a portion of the second wall surface 218 other than the linear portion 244. The arc length of the arc portion 245 gradually increases from the radially inner side toward the radially outer side. The inclination of the arc portion 245 with respect to the axial direction gradually increases from the radially inner side toward the radially outer side. Here, as shown in FIG. 8, the circular arc portion 245 located on the outer side in the radial direction is defined as an outer circular arc portion 245a.
The third wall surface 219 connects the first wall surface 217 and the second wall surface 218. The width dimension of the third wall surface 219 in the circumferential direction gradually decreases from the radially inner side toward the radially outer side (see FIG. 6 ).

The projection start end 246 is provided at the boundary between the second wall surface 218 and the outer surface 249. Here, as shown in FIG. 8, the projection start end portion 246 located on the outer side in the radial direction is defined as the outer projection start end portion 246a. Further, as shown in FIG. 9, the projection start end 246 located on the inner side in the radial direction is defined as the inner projection start end 246b.

Returning to FIG. 6, the protrusion top portion 247 is provided at the boundary portion between the second wall surface 218 and the third wall surface 219. Here, as shown in FIG. 8, the projection top 247 located on the outer side in the radial direction is defined as the outer projection top 247a. Further, as shown in FIG. 9, the projection top 247 located radially inward is defined as an inner projection top 247b.

10 shows a first wall surface 217 (first wall surface 217 in FIG. 8) on the outermost diameter side of the liquid guide portion 243 and a first wall surface 217 (first wall surface 217 in FIG. 9) on the innermost diameter side of the liquid guide portion 243. FIG. 10 is an explanatory diagram in which FIG. 8 and FIG.
As shown in FIG. 10, the straight line portion 244, the inner projection start end portion 246b, and the inner projection top portion 247b are aligned in the same straight line along the vertical direction. The outer protrusion start end portion 246a located on the outermost diameter side of the liquid guide portion 243 is located in the circumferential direction CCW of the rotor 204 in the circumferential direction more than the inner protrusion start end portion 246b located on the innermost diameter side of the liquid guide portion 243. It is located on the downstream side. The outer projection top 247a located on the outermost diameter side of the liquid guide portion 243 is located upstream of the inner projection top 247b located on the innermost diameter side of the liquid guide portion 243 in the circumferential direction in the rotation direction CCW of the rotor 204. Is located in. In the circumferential direction, the length L3 from the linear portion 244 located on the innermost diameter side of the liquid guide portion 243 to the outer protrusion start end portion 246a located on the outermost diameter side is located from the linear portion 244 to the outermost diameter side. It is formed so as to have a length equal to the length L4 up to the outer projection top 247a.

According to this embodiment, the same operation and effect as those of the above-described first embodiment can be obtained. Further, since the liquid guide portion 243 has a sufficient height in the axial direction even on the radially inner side, it is possible to reliably guide the refrigerant supplied to the radially inner side of the rotor 204 to the outer peripheral portion of the rotor 204.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in this embodiment, the liquid guide portion 43 is provided on the first end face plate 41, but the configuration is not limited to this. The liquid guide portion 43 may be provided on both the first end face plate 41 and the second end face plate 42.

The axial direction of the rotor 4 may intersect the vertical vertical direction. However, in the rotor 4 of the present embodiment in which the axial direction of the rotor 4 and the vertical direction are the same, it is possible to scatter the refrigerant in the axial direction to prevent the refrigerant from entering the air gap and efficiently supply the refrigerant to the stator 3. In that respect, it is more preferable.

The liquid guide portion 43 may be formed integrally with the end face plate 14, or may be formed by being formed as a separate component and then joined together.
The number of liquid guide portions 43 is not limited to this embodiment.

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiment with known constituent elements within the scope of the present invention, and it is also possible to appropriately combine the above-described modifications.

DESCRIPTION OF SYMBOLS 1 rotary electric machine 2 case 3 stator 4, 104, 204 rotor 12, 112 rotor core 13 permanent magnet 14 end face plate 31 stator core 33 coils 43, 143, 243 liquid guide part 45, 245 arc part 46, 246 projection start end part 47, 247 Rotation direction of protrusion CCW rotor

Claims (6)

A rotor having a rotor core, a plurality of permanent magnets arranged on the rotor core, and an end face plate arranged so that the inner side surface contacts the end face of the rotor core;
A stator having a stator core and a coil arranged on the stator core, the stator being arranged on an outer peripheral side of the rotor so as to face the rotor;
A case accommodating the rotor and the stator,
Equipped with
The axial direction of the end plate intersects the horizontal direction,
A liquid guide portion that extends in a radial direction while curving is provided on the outer surface of the end plate located on the vertically upper side,
The projection start end portion of the liquid guide portion is located from the upstream side to the downstream side in the rotation direction of the rotor as it goes from the radial inner side to the radial outer side, and connects the projection start end portion and the projection top portion. The rotating electric machine, wherein the inclination of the arcuate portion with respect to the axial direction gradually increases. The rotary electric machine according to claim 1, wherein the arc length of the arc portion of the liquid guide portion gradually increases from the radially inner side toward the radially outer side. The rotary electric machine according to claim 1 or 2, wherein the liquid guide portion gradually increases in height in the axial direction from the radially inner side toward the radially outer side. In the circumferential direction of the rotor, the length from the projection start end located on the innermost diameter side of the liquid guide portion to the projection start end located on the outermost diameter side is the projection located on the innermost diameter side. The rotary electric machine according to claim 1, wherein the rotary electric machine is formed so as to have a length equal to a length from a start end to the top of the protrusion located on the outermost diameter side. The rotary electric machine according to any one of claims 1 to 4, wherein the liquid guide portions are arranged at equal intervals in the circumferential direction of the rotor. The rotary electric machine according to any one of claims 1 to 5, wherein the end face plate is arranged so that the axial direction of the end face plate coincides with the gravity direction.

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