WO2019022108A1 - motor - Google Patents

Abstract

In an embodiment of a motor according to the present invention, a housing comprises a cylindrical circumferential wall part, and is a single member. The circumferential wall part includes: a cooling flow path; and a partitioning wall part that separates a stator housing part and an inverter housing part. At least a portion of the cooling flow path is provided in the partitioning wall part. The cooling flow path includes: a flow path body part; an inlet through which a refrigerant flows in; an outlet through which the refrigerant flows out; an inflow part where the inlet is provided; and an outflow part where the outlet is provided. A first direction in which the refrigerant flows from the inflow part toward the flow path body part intersects with an inflow direction in which the refrigerant flows in from the inlet to the inflow part. A second direction in which the refrigerant flows from the flow path body part toward the outflow part intersects with an outflow direction in which the refrigerant flows out from the outflow part to the outlet. A dimension, in the inflow direction, of the inflow part is greater than a dimension, in the inflow direction, of a portion of the flow path body part to which the inflow part is connected. A dimension, in the outflow direction, of the outflow part is greater than a dimension, in the outflow direction, of a portion of the flow path body part to which the outflow part is connected.

Description

motor

The present invention relates to a motor.

A motor is known in which a rotor and a stator and an inverter device are housed in a housing and integrated. For example, Japanese Patent Application Laid-Open No. 2015-104257 describes a configuration in which a rotor, a stator, and an inverter device are disposed on a central axis in a housing.

JP, 2015-104257, A

In the motor as described above, it is required that the stator and the inverter device can be efficiently cooled. As a method of cooling the stator and the inverter device, it is conceivable to provide a cooling flow passage through which the refrigerant flows in the housing. However, simply providing the cooling flow path in the housing increases the pressure loss of the refrigerant in the cooling flow path, and there are cases where sufficient cooling efficiency of the stator and the inverter device can not be obtained.

An object of the present invention is to provide a motor having a structure capable of improving the cooling efficiency of a stator and an inverter unit by a cooling flow channel in view of the above-mentioned circumstances.

According to one aspect of the motor of the present invention, there is provided a rotor having a motor shaft disposed along a central axis extending in one direction, a stator opposed to the rotor via a gap in the radial direction, and the stator electrically An inverter unit to be connected, and a housing having a stator accommodating unit for accommodating the stator and an inverter accommodating unit for accommodating the inverter unit, the inverter accommodating unit being located radially outward of the stator accommodating unit The housing has a cylindrical peripheral wall portion surrounding the rotor and the stator on the radially outer side of the rotor and the stator, and is a single member, and the peripheral wall portion is a cooling channel, A partition wall that divides the stator housing portion and the inverter housing portion, and at least a portion of the cooling channel is the partition wall The cooling flow passage is connected to the flow passage main body, an inlet through which the refrigerant flows, an outlet through which the refrigerant flows out, and an inlet through which the flow passage main portion is connected, An outflow portion connected to the flow path main body and provided with the outflow port, and a first direction in which the refrigerant flows from the inflow portion to the flow path main body is from the inflow port to the inflow portion The second direction in which the refrigerant flows from the flow path main body toward the outflow portion intersects with the inflow direction of the refrigerant flowing into the flow passage from the outflow portion to the outflow outlet. The dimension of the inflow direction of the inflow portion which intersects the direction is larger than the dimension of the inflow direction of the portion of the flow path main body portion to which the inflow portion is connected, and the dimension of the outflow direction of the outflow portion is the Part of the flow path main body part where the outflow part is connected Larger than the dimension of the outflow direction of.

According to one aspect of the present invention, a motor having a structure capable of improving the cooling efficiency of the stator and the inverter unit by the cooling flow passage is provided.

FIG. 1 is a perspective view showing the motor of the first embodiment. FIG. 2 is a view showing the motor of the first embodiment, and is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a view showing the motor of the first embodiment, and is a cross-sectional view taken along the line III-III in FIG. FIG. 4 is a top view of the motor of the first embodiment. FIG. 5 is a perspective view showing the cooling unit of the first embodiment. FIG. 6 is a cross-sectional view showing a part of the motor of the first embodiment. FIG. 7 is a cross-sectional view showing a part of a motor according to a modification of the first embodiment. FIG. 8 is a perspective view showing a cooling unit of the second embodiment.

The Z-axis direction shown in each drawing is the vertical direction Z with the positive side as the upper side and the negative side as the lower side. The Y-axis direction is a direction parallel to the central axis J extending in one direction shown in each drawing and a direction orthogonal to the vertical direction Z. In the following description, a direction parallel to the central axis J, that is, the Y-axis direction is referred to as “axial direction Y”. Further, the positive side in the axial direction Y is referred to as “axial one side”, and the negative side in the axial direction Y is referred to as “axial other side”. The X-axis direction shown in each drawing is a direction orthogonal to both the axial direction Y and the vertical direction Z. In the following description, the X-axis direction is referred to as "width direction X". Further, the positive side in the width direction X is referred to as "one side in the width direction", and the negative side in the width direction X is referred to as the other side in the width direction. In the present embodiment, the vertical direction Z corresponds to the third direction.

Further, a radial direction centered on the central axis J is simply referred to as “radial direction”, and a circumferential direction centered on the central axis J is simply referred to as “circumferential direction θ”. In addition, in the circumferential direction θ, the side advancing clockwise as viewed from the other side in the axial direction to the one side in the axial direction, that is, the side advancing the arrow indicating the circumferential direction θ in the figure is referred to as “one side in the circumferential direction” The side advancing in the counterclockwise direction, that is, the side opposite to the advancing side of the arrow indicating the circumferential direction θ in the drawing is called “the other side in the circumferential direction”.

Note that the vertical direction and the upper and lower sides are simply names for describing the relative positional relationship of each part, and the actual positional relationship etc. is a positional relationship other than the positional relationship etc indicated by these names. May be

First Embodiment
As shown in FIGS. 1 and 2, the motor 1 according to this embodiment includes a housing 10, a lid 11, a cover member 12, a sensor cover 13, and a motor shaft 21 disposed along a central axis J. It has a rotor 20, a stator 30, an inverter unit 50, a connector portion 18, and a rotation detection portion 70.

As shown in FIG. 2, the housing 10 accommodates the rotor 20, the stator 30, the rotation detection unit 70, and the inverter unit 50. The housing 10 is a single member. The housing 10 is made, for example, by sand casting. The housing 10 has a peripheral wall portion 10b, a bottom wall portion 10a, a bearing holding portion 10c, and a rectangular tube portion 10e.

The peripheral wall portion 10 b has a cylindrical shape that surrounds the rotor 20 and the stator 30 on the radially outer side of the rotor 20 and the stator 30. In the present embodiment, the peripheral wall portion 10 b is substantially cylindrical with the central axis J as a center. The peripheral wall portion 10 b is open to one side in the axial direction. The peripheral wall portion 10 b has a cooling portion 60 that cools the stator 30 and the inverter unit 50.

The bottom wall portion 10a is provided at the other end of the circumferential wall portion 10b in the axial direction. The bottom wall portion 10a closes the other side of the circumferential wall portion 10b in the axial direction. The bottom wall portion 10a has a sensor housing portion 10g penetrating the bottom wall portion 10a in the axial direction Y. The sensor storage portion 10 g has, for example, a circular shape centered on the central axis J when viewed along the axial direction Y. The bottom housing portion 10 a and the peripheral wall portion 10 b constitute a stator housing portion 14. That is, the housing 10 has a bottomed cylindrical stator housing portion 14 having a peripheral wall portion 10 b and a bottom wall portion 10 a.

The bearing holding portion 10c has a cylindrical shape that protrudes in the axial direction from the peripheral edge portion of the sensor accommodating portion 10g on the surface on the one side in the axial direction of the bottom wall portion 10a. The bearing holder 10 c holds a bearing that supports the motor shaft 21 on the other side in the axial direction with respect to the rotor core 22 described later.

As shown in FIGS. 1 to 4, the rectangular tube portion 10 e has a rectangular tube shape extending upward from the peripheral wall portion 10 b. The rectangular tube portion 10e opens upward. In the present embodiment, the rectangular tube portion 10 e has, for example, a square tube shape. As shown in FIG. 2, of the wall parts constituting the rectangular tube part 10 e, the wall part on the other side in the axial direction is connected to the upper end part of the bottom wall part 10 a. The square tube portion 10 e has a through hole 10 f penetrating in the axial direction Y a wall portion on one side in the axial direction among wall portions constituting the square tube portion 10 e. The lower end portion of the through hole 10 f is connected to the opening on one side in the axial direction of the peripheral wall portion 10 b. An inverter accommodating portion 15 is configured by the rectangular tube portion 10 e and the peripheral wall portion 10 b. That is, the housing 10 has an inverter accommodating portion 15.

The inverter accommodating portion 15 is located radially outside the stator accommodating portion 14. In the present embodiment, the inverter accommodating portion 15 is located above the stator accommodating portion 14 in the vertical direction Z orthogonal to the axial direction Y. The stator housing portion 14 and the inverter housing portion 15 are partitioned in the vertical direction Z by the partition wall portion 10 d. The partition wall portion 10d is an upper portion of the peripheral wall portion 10b. That is, the peripheral wall portion 10 b has a partition wall portion 10 d that divides the stator accommodation portion 14 and the inverter accommodation portion 15.

As shown in FIG. 3, the dimension in the vertical direction Z of the partition wall portion 10 d becomes larger as it goes away from the central axis J in the width direction X orthogonal to both the axial direction Y and the vertical direction Z. That is, the dimension in the vertical direction Z of the partition wall portion 10d is smallest at the central portion where the position in the width direction X is the same as the central axis J, and increases as moving away from the central portion on both sides in the width direction X.

The lid 11 shown in FIG. 2 has a plate shape whose plate surface is orthogonal to the vertical direction Z. The lid portion 11 is fixed to the upper end portion of the rectangular tube portion 10 e. The lid 11 closes the upper opening of the rectangular tube 10 e. In addition, illustration of the cover part 11 is abbreviate | omitted in FIG. As shown in FIGS. 1 and 2, the cover member 12 has a plate shape whose plate surface is orthogonal to the axial direction Y. The cover member 12 is fixed to a surface on one side in the axial direction of the peripheral wall portion 10b and the rectangular tube portion 10e. The cover member 12 closes the opening on one axial side of the peripheral wall portion 10b and the through hole 10f.

As shown in FIG. 2, the cover member 12 has an output shaft hole 12 a that penetrates the cover member 12 in the axial direction Y. The output shaft hole 12a has, for example, a circular shape passing through the central axis J. The cover member 12 has a bearing holding portion 12b projecting to the other axial side from the peripheral edge portion of the output shaft hole 12a in the surface on the other axial side of the cover member 12. The bearing holding portion 12 b holds a bearing that supports the motor shaft 21 on one side in the axial direction with respect to a rotor core 22 described later.

The sensor cover 13 is fixed to the other surface of the bottom wall portion 10 a in the axial direction. The sensor cover 13 covers and closes the opening on the other side in the axial direction of the sensor housing portion 10g. The sensor cover 13 covers the rotation detection unit 70 from the other side in the axial direction.

The rotor 20 has a motor shaft 21, a rotor core 22, a magnet 23, a first end plate 24 and a second end plate 25. The motor shaft 21 is rotatably supported by bearings at axially opposite portions. The end of the motor shaft 21 on the one side in the axial direction protrudes from the opening on the one side in the axial direction of the peripheral wall portion 10 b toward the one side in the axial direction. An end of the motor shaft 21 on one side in the axial direction passes through the output shaft hole 12 a and protrudes to one side in the axial direction with respect to the cover member 12. The other axial end of the motor shaft 21 is inserted into the sensor housing 10g.

The rotor core 22 is fixed to the outer peripheral surface of the motor shaft 21. The magnet 23 is inserted into a hole passing through the rotor core 22 provided in the rotor core 22 in the axial direction Y. The first end plate 24 and the second end plate 25 are in the form of a radially expanding annular plate. The first end plate 24 and the second end plate 25 sandwich the rotor core 22 in the axial direction Y while in contact with the rotor core 22. The first end plate 24 and the second end plate 25 press the magnet 23 inserted into the hole of the rotor core 22 from both sides in the axial direction.

The stator 30 faces the rotor 20 in the radial direction via a gap. The stator 30 has a stator core 31 and a plurality of coils 32 mounted on the stator core 31. The stator core 31 has an annular shape centered on the central axis J. The outer peripheral surface of the stator core 31 is fixed to the inner peripheral surface of the peripheral wall 10b. The stator core 31 faces the radially outer side of the rotor core 22 via a gap.

The inverter unit 50 controls the power supplied to the stator 30. The inverter unit 50 includes an inverter unit 51 and a capacitor unit 52. That is, the motor 1 includes an inverter unit 51 and a capacitor unit 52. The inverter unit 51 is accommodated in the inverter accommodation unit 15. The inverter unit 51 has a first circuit board 51a and a second circuit board 51b. The first circuit board 51 a and the second circuit board 51 b have a plate shape whose plate surface is orthogonal to the vertical direction Z. The second circuit board 51b is spaced apart above the first circuit board 51a. The first circuit board 51a and the second circuit board 51b are electrically connected. The coil wire 32 a is connected to the first circuit board 51 a via the connector terminal 53. Thus, the inverter unit 51 is electrically connected to the stator 30.

As shown in FIG. 2 and FIG. 4, the capacitor portion 52 is in the shape of a rectangular solid long in the width direction X. Capacitor portion 52 is accommodated in inverter accommodating portion 15. The capacitor unit 52 is disposed on the other side of the inverter unit 51 in the axial direction. That is, in the inverter accommodating portion 15, the inverter portion 51 and the capacitor portion 52 are arranged side by side in the axial direction Y. The capacitor unit 52 is electrically connected to the inverter unit 51. As shown in FIG. 2, the capacitor portion 52 is fixed to the upper surface of the partition wall portion 10 d. Condenser part 52 contacts partition wall part 10d.

As shown in FIG. 1, the connector portion 18 is provided on the other surface of the rectangular tube portion 10 e in the width direction. An external power supply (not shown) is connected to the connector portion 18. Power is supplied to the inverter unit 50 from an external power supply connected to the connector unit 18.

The rotation detection unit 70 detects the rotation of the rotor 20. In the present embodiment, the rotation detection unit 70 is, for example, a VR (Variable Reluctance) resolver. As shown in FIG. 2, the rotation detection unit 70 is accommodated in the sensor accommodation unit 10 g. That is, the rotation detection unit 70 is disposed on the bottom wall portion 10a. The rotation detection unit 70 includes a detection target unit 71 and a sensor unit 72.

The to-be-detected part 71 is annular shaped extended in the circumferential direction θ. The to-be-detected part 71 is fitted and fixed to the motor shaft 21. The to-be-detected part 71 is made of magnetic material. The sensor unit 72 has an annular shape surrounding the outside in the radial direction of the detection target 71. The sensor unit 72 is fitted to the sensor storage unit 10g. The sensor unit 72 is supported by the sensor cover 13 from the other side in the axial direction. That is, the sensor cover 13 supports the rotation detection unit 70 from the other side in the axial direction. The sensor unit 72 has a plurality of coils along the circumferential direction θ.

Although not shown, the motor 1 further includes a sensor wire that electrically connects the rotation detection unit 70 and the inverter unit 51. One end of the sensor wiring is connected to the detected portion 71. The sensor wiring is routed from the detected portion 71 to the inside of the inverter accommodating portion 15 through a through hole which penetrates the inside of the bottom wall portion 10a and the partition wall portion 10d in the radial direction. The other end of the sensor wiring is connected to, for example, the first circuit board 51a.

When the detected portion 71 rotates with the motor shaft 21, an induced voltage is generated in the coil of the sensor portion 72 according to the circumferential position of the detected portion 71. The sensor unit 72 detects the induced voltage to detect the rotation of the detection target unit 71. Thus, the rotation detection unit 70 detects the rotation of the motor shaft 21 and detects the rotation of the rotor 20. The rotation information of the rotor 20 detected by the rotation detection unit 70 is sent to the inverter unit 51 via the sensor wiring.

As shown in FIG. 5, the cooling unit 60 has a cooling channel 61. That is, the peripheral wall portion 10 b has the cooling flow passage 61. In the present embodiment, the cooling unit 60 is configured of only one cooling channel 61. In FIG. 5, the internal space of the cooling unit 60 is shown as a three-dimensional shape.

A refrigerant flows in the cooling channel 61. The refrigerant is not particularly limited as long as it is a fluid that can cool the stator 30 and the inverter unit 51. The refrigerant may be water, a liquid other than water, or a gas.

The cooling channel 61 extends in the circumferential direction θ as a whole. The cooling channel 61 includes a channel body 61a, an inlet 61b, an outlet 61c, an inlet 61d, and an outlet 61e. The flow passage main portion 61 a extends in a wave shape along the circumferential direction θ. More specifically, as shown in FIG. 3 and FIG. 5, the flow path main body 61a substantially turns the peripheral wall 10b in a wave shape along the circumferential direction θ from the other side in the width direction of the peripheral wall 10b. Provided. As shown in FIG. 3, the central angle φ of the flow path main portion 61 a is larger than 180 °.

As shown in FIG. 5, the flow passage main portion 61a has a plurality of first flow passage portions 62a, a plurality of second flow passage portions 62b, and a widening portion 62c. The first flow passage portion 62 a extends in the axial direction Y. The plurality of first flow passage portions 62a are arranged side by side along the circumferential direction θ. The second flow passage portion 62b extends in the circumferential direction θ. The second flow passage portion 62b connects the first flow passage portions 62a adjacent to each other in the circumferential direction θ. In the present embodiment, the second flow passage portion 62b connects the end portions in the axial direction Y of the first flow passage portion 62a. That is, the second flow passage portion 62b extends in the circumferential direction θ from the end portion of the first flow passage portion 62a in the axial direction Y. The second flow passage portion 62b includes a second flow passage portion 62b connecting end portions on one axial side of the first flow passage portion 62a adjacent in the circumferential direction θ, and a first flow passage portion adjacent in the circumferential direction θ And a second flow passage portion 62b connecting the end portions on the other side in the axial direction of 62a. For example, six first flow path portions 62a are provided. For example, five second flow passage portions 62b are provided.

The widening portion 62c is provided at an inner corner portion in a portion where the first flow passage portion 62a and the second flow passage portion 62b are connected, and both the first flow passage portion 62a and the second flow passage portion 62b are provided. It connects. In the present specification, the “inner corner in the portion where the first channel portion and the second channel portion are connected” refers to the direction from the first channel portion toward the second channel portion, or the second flow. It is an inner corner in a curved portion of the flow passage main portion which is bent from the passage portion toward the first flow passage portion.

The wide portion 62c is configured such that an inner corner portion in a portion where the first channel portion 62a and the second channel portion 62b are connected is expanded. The widening portion 62c increases the dimension in the circumferential direction θ and the axial direction Y of the flow passage main portion 61a at the connection portion between the first flow passage portion 62a and the second flow passage portion 62b. More specifically, the widened portion 62c increases the dimension of the circumferential direction θ of the flow passage main portion 61a in the first flow passage portion 62a at the connection portion between the first flow passage portion 62a and the second flow passage portion 62b. In the second flow passage portion 62b, the dimension in the axial direction Y of the flow passage main portion 61a is increased.

In the present embodiment, the widening portion 62c is a connection portion between the first flow passage portion 62a and the second flow passage portion 62b disposed on the other side in the circumferential direction, and a first flow passage disposed on the one side in the circumferential direction. One each is provided in the connection part of the part 62a and the 2nd flow path part 62b. The first flow path portion 62a disposed on the other side in the circumferential direction is the first flow path portion 62a located on the most upstream side in the cooling flow path 61, and the first flow path portion 62a connected to the inflow portion 61b. It is. The first flow path portion 62a disposed on the most circumferential side is the first flow path portion 62a located on the most downstream side in the cooling flow path 61, and the first flow path portion 62a connected to the outflow portion 61c. It is.

The inflow portion 61 b is connected to the flow path main portion 61 a. In more detail, the inflow part 61b is connected with the edge part of the circumferential direction other side of the flow-path main-body part 61a. In the present embodiment, the end on the other side in the circumferential direction of the flow path main portion 61a is the first flow path portion 62a disposed on the other side in the circumferential direction. The inflow portion 61 b is connected to one side in the axial direction of the first flow passage portion 62 a disposed closest to the other side in the circumferential direction. An inflow port 61 d is provided in the inflow portion 61 b.

The outflow portion 61c is connected to the flow path main portion 61a. In more detail, the outflow part 61c is connected with the edge part of the circumferential direction one side of the flow-path main-body part 61a. In the present embodiment, an end on one circumferential side of the flow passage main portion 61 a is a first flow passage 62 a disposed closest to one circumferential side. The outflow portion 61 c is connected to one side in the axial direction of the first flow passage portion 62 a disposed closest to the one side in the circumferential direction. The outlet 61e is provided at the outlet 61c. The inflow portion 61 b and the outflow portion 61 c are disposed at the same position in the axial direction Y and the width direction X. The inflow portion 61 b and the outflow portion 61 c are disposed at an interval in the vertical direction Z. The shape of the inflow portion 61 b and the shape of the outflow portion 61 c are symmetrical in the vertical direction Z.

The inflow port 61d protrudes from the inflow portion 61b to the other side in the width direction. The refrigerant flows into the inflow port 61d. The cross-sectional shape orthogonal to the width direction X of the inflow port 61d is, for example, a circular shape. As shown in FIG. 3, the inflow pipe 16 is connected to the inflow port 61 d. The inflow pipe 16 is inserted into a hole provided in the housing 10. The inflow pipe 16 protrudes from the housing 10 to the other side in the width direction.

The outlet 61e protrudes from the outlet 61c to the other side in the width direction. The refrigerant flows out from the outlet 61e. The cross-sectional shape orthogonal to the width direction X of the outlet 61e is, for example, a circular shape. The shape of the outlet 61e is similar to the shape of the inlet 61d. As shown in FIG. 5, the inlet 61 d and the outlet 61 e are disposed at the same position in the axial direction Y. The inlet 61 d and the outlet 61 e are spaced apart in the vertical direction Z.

As shown in FIG. 3, the outlet pipe 17 is connected to the outlet 61 e. The outflow pipe 17 is inserted into a hole provided in the housing 10. The outflow pipe 17 projects from the housing 10 to the other side in the width direction. As shown in FIG. 1, the inflow pipe 16 and the outflow pipe 17 are disposed at the same position in the axial direction Y. The inflow pipe 16 and the outflow pipe 17 are spaced in the vertical direction Z from each other.

The refrigerant flowing from the inflow pipe 16 into the cooling flow passage 61 through the inflow port 61d flows in the order of the inflow portion 61b, the flow path main portion 61a and the outflow portion 61c, and the housing 10 through the outflow pipe 17 from the outflow port 61e. Spill out of the

As shown in FIG. 5, in the present embodiment, the inflow direction of the refrigerant flowing into the inflow portion 61 b from the inflow port 61 d is a direction parallel to the width direction X. The inflow direction is a direction from the other side in the width direction toward one side in the width direction. The first direction in which the refrigerant flows from the inflow portion 61 b toward the flow path main portion 61 a is a direction parallel to the axial direction Y. The first direction is a direction from one axial side to the other axial side. The first direction in which the refrigerant flows from the inflow portion 61b toward the flow path main portion 61a intersects with the inflow direction in which the refrigerant flows from the inflow port 61d into the inflow portion 61b. In the present embodiment, the first direction is orthogonal to the inflow direction.

In the present embodiment, the second direction in which the refrigerant flows from the flow path main portion 61 a to the outflow portion 61 c is a direction parallel to the axial direction Y. The second direction is a direction from the other side in the axial direction toward one side in the axial direction. The outflow direction of the refrigerant flowing out from the outflow portion 61c to the outflow port 61e is parallel to the width direction X. The outflow direction is a direction from one width direction side to the other width direction side. The second direction in which the refrigerant flows from the flow path main portion 61a to the outflow portion 61c intersects with the outflow direction in which the refrigerant flows out from the outflow portion 61c to the outflow port 61e. In the present embodiment, the second direction is orthogonal to the outflow direction.

In the present embodiment, the first direction and the second direction are parallel to each other, and the inflow direction and the outflow direction are parallel to each other. Therefore, as in the present embodiment, the inlet 61 d and the outlet 61 e can be easily disposed on the same side of the housing 10, and the refrigerant can easily flow into the cooling channel 61.

The dimension of the inflow direction of the inflow part 61b is larger than the dimension of the inflow direction in the part of the flow-path main-body part 61a which the inflow part 61b connects. In the present embodiment, the dimension in the inflow direction of the inflow portion 61 b is the dimension in the width direction X of the inflow portion 61 b. The dimension in the inflow direction of the portion of the flow path main portion 61a to which the inflow portion 61b is connected is the dimension in the width direction X of the first flow path portion 62a disposed on the other side in the circumferential direction. The dimension in the inflow direction of the inflow portion 61 b decreases as it goes from the upper side to the lower side.

The dimension of the outflow direction of the outflow portion 61c is larger than the dimension of the outflow direction of the portion of the flow path main portion 61a to which the outflow portion 61c is connected. In the present embodiment, the dimension in the outflow direction of the outflow portion 61c is the dimension in the width direction X of the outflow portion 61c. The dimension in the outflow direction of the portion of the flow passage main portion 61a to which the outflow portion 61c is connected is the dimension in the width direction X of the first flow passage portion 62a disposed closest to one circumferential direction. The dimension of the outflow direction of the outflow part 61c becomes smaller as it goes upward from the lower side.

For example, in the case where the refrigerant flows across two intersecting flow paths, when the flow direction of the refrigerant flows from one flow path to the other flow path changes, the abrupt change in the flowing direction is compared. Large pressure loss is likely to occur. On the other hand, according to the present embodiment, the dimension of the inflow direction in the inflow portion 61b, which is a portion where the flow of the refrigerant changes in the first direction intersecting the inflow direction from the inflow direction, the refrigerant flows from the inflow portion 61b. It is larger than the dimension in the inflow direction at the portion of the flow path main portion 61 a to be cut. Therefore, in the inflow portion 61b, the flow direction of the refrigerant can be changed relatively gently from the inflow direction to the first direction. Thereby, the pressure loss generated in the refrigerant flowing from the inflow port 61 d to the flow path main body 61 a via the inflow portion 61 b can be reduced.

Further, according to the present embodiment, the dimension in the outflow direction at the outflow portion 61c, which is a portion where the flow of the refrigerant changes from the second direction to the outflow direction intersecting the second direction, is a flow path main portion connected to the outflow portion 61c. It is larger than the dimension in the outflow direction in the portion 61a. Therefore, in the outflow portion 61c, the flow direction of the refrigerant can be changed relatively gently from the second direction to the outflow direction. As a result, it is possible to reduce the pressure loss generated in the refrigerant flowing from the flow path body 61a to the outlet 61e via the outlet 61c.

As described above, according to the present embodiment, the pressure generated in the refrigerant when the refrigerant flows from the inflow port 61 d to the flow path body 61 a and when the refrigerant flows from the flow path body 61 a to the outflow port 61 e Loss can be reduced. Thereby, the pressure loss of the refrigerant flowing in the cooling flow passage 61 can be reduced, and the refrigerant can be efficiently flowed into the cooling flow passage 61.

As shown in FIG. 6, at least a part of the cooling channel 61 is provided in the partition wall portion 10 d. Therefore, the stator accommodating portion 14 and the inverter accommodating portion 15 partitioned by the partition wall portion 10 d can be cooled by the refrigerant flowing through the cooling flow passage 61, and the stator 30 and the inverter accommodating portion 15 accommodated in the stator accommodating portion 14. Can be cooled. Then, as described above, according to the present embodiment, the pressure loss of the refrigerant flowing in the cooling flow passage 61 can be reduced, and the refrigerant can flow efficiently. Thereby, it is possible to suppress the decrease in the flow velocity of the refrigerant, and the stator 30 and the inverter unit 51 can be easily cooled. Therefore, according to the present embodiment, the motor 1 having a structure capable of improving the cooling efficiency of the stator 30 and the inverter unit 51 by the cooling flow passage 61 can be obtained.

Further, according to the present embodiment, the first direction is orthogonal to the inflow direction, and the second direction is orthogonal to the outflow direction. In such a case, when the flow direction of the refrigerant changes from the first direction to the inflow direction, and when the flow direction of the refrigerant changes from the second direction to the outflow direction, pressure loss may be particularly likely to occur. . Therefore, the above-described effect of reducing the pressure loss is particularly useful when the first direction is orthogonal to the inflow direction and the second direction is orthogonal to the outflow direction.

Further, according to the present embodiment, the widening portion 62c is provided at an inner corner portion in a portion where the first flow passage portion 62a and the second flow passage portion 62b are connected. Therefore, the width of the cooling channel 61 can be increased at the portion where the first channel portion 62a and the second channel portion 62b are connected. Thus, when the refrigerant flows from the first flow path portion 62a extending in the axial direction Y into the second flow path portion 62b extending in the circumferential direction θ, the flow direction of the refrigerant is the first flow path including the widening portion 62c The connecting portion between the portion 62a and the second flow passage portion 62b can be gently changed from the axial direction Y to the circumferential direction θ. Further, when the refrigerant flows from the second flow passage portion 62b to the first flow passage portion 62a, the flow direction of the refrigerant is determined by the first flow passage portion 62a including the widening portion 62c and the second flow passage portion 62b. At the connection portion, it is possible to gently change from the circumferential direction θ to the axial direction Y. Therefore, the pressure loss of the refrigerant in the cooling flow passage 61 can be further reduced.

Further, according to the present embodiment, the flow path main portion 61a extends in a wave shape along the circumferential direction θ. Therefore, the flow passage main portion 61a can be disposed over a relatively wide range while the width of the flow passage main portion 61a is reduced to reduce the flow passage cross-sectional area of the flow passage main portion 61a. As a result, the flow velocity of the refrigerant flowing in the flow path main body 61a can be relatively increased, and the cooling efficiency of the stator 30 and the inverter 51 by the refrigerant can be improved. Further, the relatively wide range of the stator accommodation portion 14 and the inverter accommodation portion 15 can be cooled by the flow path main body portion 61 a, and the stator 30 and the inverter portion 51 can be cooled more.

In the present embodiment, the refrigerant having flowed into the cooling flow passage 61 is the upper end of the peripheral wall 10b, that is, the partition wall 10d, the one end of the peripheral wall 10b in the width direction, and the lower end of the peripheral wall 10b Flow through in order. Therefore, the refrigerant whose temperature is relatively low immediately after flowing into the cooling flow passage 61 from the inflow port 61 d can flow to the partition wall portion 10 d, and the inverter portion 51 can be cooled. This makes it easier to cool the inverter unit 51. The heat generation of the inverter unit 51 is particularly likely to be large, and thus the motor 1 can be cooled more preferably by cooling the inverter unit 51 easily.

In the present embodiment, a portion provided in the partition wall portion 10 d in the cooling flow passage 61 is a single layer flow passage between the stator accommodation portion 14 and the inverter portion 51 in the radial direction. Therefore, the configuration of the cooling flow channel 61 can be simplified as compared with the case where the flow channels of a plurality of layers are provided side by side in the radial direction. As a result, both the stator 30 and the inverter unit 51 can be cooled by the single layer cooling flow passage 61, which is efficient. Further, the dimension in the radial direction of the partition wall portion 10d can be easily reduced, and the motor 1 can be easily miniaturized. As described above, according to the present embodiment, the motor 1 having a structure capable of further improving the cooling efficiency of the stator 30 and the inverter unit 51 by the cooling flow passage 61 can be obtained.

In the present specification, "a channel is a channel in a single layer in a part" includes that only one continuous channel is provided in a part. For example, even if the same flow path is continuous as a whole, in the case where two portions that are discontinuous in a certain portion are provided, a plurality of layers of flow paths are provided in a certain portion. In the present embodiment, the portion of the cooling passage 61 provided between the stator accommodation portion 14 and the inverter portion 51 in the radial direction is only one continuous portion.

Further, according to the present embodiment, the flow passage main portion 61a has a central angle φ larger than 180 °. Therefore, it is easy to surround the stator 30 by the cooling flow passage 61, and the stator 30 can be cooled more.

Further, according to the present embodiment, the condenser portion 52 accommodated in the inverter accommodating portion 15 can also be cooled by the cooling flow passage 61. Thus, three parts can be simultaneously cooled by one cooling channel 61, and cooling can be performed more efficiently while reducing the number of cooling channels 61.

In the present embodiment, the upper portion of the flow path main portion 61a is provided in the partition wall portion 10d. As shown in FIG. 6, a portion provided on partition wall portion 10 d of cooling flow channel 61 has a portion overlapping with inverter portion 51 and a portion overlapping with capacitor portion 52 when viewed along vertical direction Z. . Therefore, the stator 30, the inverter unit 51, and the capacitor unit 52 can be more easily cooled by the refrigerant flowing in the cooling flow passage 61.

Further, as described above, in the present embodiment, the capacitor portion 52 contacts the partition wall portion 10d. Therefore, the heat of the condenser portion 52 is easily released to the refrigerant in the cooling flow passage 61 along the partition wall portion 10 d. Therefore, the condenser portion 52 can be more easily cooled by the cooling flow passage 61.

In the portion 10j of the partition wall portion 10d located between the cooling flow passage 61 and the inverter accommodation portion 15 in the radial direction, the portion 10i located between the cooling flow passage 61 and the inverter portion 51 in the radial direction The dimension in the radial direction is smaller than that of the portion 10 h positioned between the flow path 61 and the capacitor portion 52 in the radial direction. That is, the radial dimension L1 of the portion 10i is smaller than the radial dimension L3 of the portion 10h. As a result, the cooling flow passage 61 can be brought close to the inverter unit 51, and the inverter unit 51 can be cooled more easily.

In the present embodiment, the portion 10i is a portion of the partition wall portion 10d located between the first channel portion 62a and the inverter portion 51 in the radial direction, and the second channel portion 62b and the inverter of the partition wall portion 10d. And a portion positioned between the portion 51 and the radial direction. The portion 10 h is a portion of the partition wall portion 10 d located in the radial direction between the first flow path portion 62 a and the capacitor portion 52, and the portion 10 h of the partition wall portion 10 d with the second flow path portion 62 b and the capacitor portion 52. And a portion located between the radial directions.

The portion 10 j of the partition wall portion 10 d located between the cooling flow passage 61 and the inverter accommodation portion 15 in the radial direction is located between the cooling flow passage 61 and the stator accommodation portion 14 in the partition wall portion 10 d. The radial dimension is smaller than the located portion 10k. That is, the radial dimension L1 of the portion 10i and the radial dimension L3 of the portion 10h are smaller than the radial dimension L2 of the portion 10k. As a result, the cooling flow passage 61 can be made closer to the inverter accommodating portion 15 than the stator accommodating portion 14, and the inverter accommodating portion 15 can be more easily cooled. Further, since the dimension L2 can be relatively easily increased, the dimension in the radial direction of the portion of the circumferential wall portion 10b in contact with the stator core 31 can be easily increased. Thereby, the intensity | strength holding the stator core 31 in the surrounding wall part 10b can be comparatively enlarged. As described above, the dimension L1, the dimension L2, and the dimension L3 satisfy the relationship of L1 <L3 <L2.

Note that the above-described magnitude relationship between the dimension L1, the dimension L2, and the dimension L3 may be established at least between the minimum values of the respective dimensions. For example, in the present embodiment, although the dimension L1 and the dimension L2 differ depending on the position in the circumferential direction θ, when the minimum value of the dimension L1 and the minimum value of the dimension L2 are compared with the dimension L3, L1 <L3 <L2 described above It suffices to satisfy the relationship. In the present embodiment, the magnitude relationship among the dimensions L1, L2, and L3 satisfies the relationship of L1 <L3 <L2 at the central portion in the width direction X of the partition wall 10d.

The dimension L4 in the axial direction Y of the cooling flow passage 61 is larger than the dimension L5 in the axial direction Y of the first circuit board 51a and the dimension L6 in the axial direction Y of the second circuit board 51b. Therefore, the dimension L4 in the axial direction Y of the cooling flow passage 61 can be made relatively large, and the range that can be cooled by one cooling flow passage 61 can be broadened. Further, the flow rate of the refrigerant flowing into the cooling flow passage 61 can be increased. Therefore, the cooling efficiency by the cooling channel 61 can be further improved. The dimension L5 in the axial direction Y of the first circuit board 51a is smaller than the dimension L6 in the axial direction Y of the second circuit board 51b. That is, the dimension L4, the dimension L5, and the dimension L6 satisfy the relationship of L5 <L6 <L4. In the present embodiment, the dimension L4 in the axial direction Y of the cooling flow passage 61 is the dimension in the axial direction Y of the first flow passage portion 62a.

The dimension L 4 in the axial direction Y of the cooling flow passage 61 is larger than the dimension in the axial direction Y of the condenser portion 52. As shown in FIG. 4, in the present embodiment, the dimension L4 in the axial direction Y of the cooling flow passage 61 is smaller than the dimension in the width direction X of the second circuit board 51 b and the dimension in the width direction X of the capacitor portion 52. Although not shown, the dimension L4 in the axial direction Y of the cooling flow passage 61 is smaller than the dimension in the width direction X of the first circuit board 51a.

The maximum dimension in the width direction X of the cooling flow passage 61 is larger than the dimension in the width direction X of the second circuit board 51 b and the dimension in the width direction X of the capacitor portion 52. Moreover, although illustration is abbreviate | omitted, the largest dimension of the width direction X of the cooling flow path 61 is larger than the dimension of the width direction X of the 1st circuit board 51a. Therefore, it is easier to cool the inverter unit 51 and the capacitor unit 52 by the cooling flow passage 61. The maximum dimension in the width direction X of the cooling flow channel 61 is the width between the portion located on the one side in the width direction in the cooling flow channel 61 and the portion located on the other side in the width direction on the cooling flow channel 61. It is the distance in the direction X. In the present embodiment, the maximum dimension in the width direction X of the cooling flow passage 61 corresponds to the outer diameter of the flow passage main portion 61 a.

In the present embodiment, the cooling unit 60 is formed by a portion of the sand mold having the shape of the cooling unit 60 when the housing 10 is manufactured by sand casting. As shown in FIGS. 1 and 2, the housing 10 has a plurality of discharge holes 19 for discharging a sand mold for forming the cooling unit 60. After the housing 10 is manufactured by sand casting, the sand mold for forming the cooling unit 60 is discharged from the discharge hole 19. The discharge hole 19 is connected to the cooling unit 60. The plug 80 is pressed into the discharge hole 19. The discharge hole 19 is closed by the plug 80, and the refrigerant in the cooling unit 60 can be prevented from leaking to the outside of the housing 10.

(Modification of the first embodiment)
As shown in FIG. 7, in the housing 110 of the present modification, the cooling flow passage 161 and the capacitor portion are provided in the portion 110 j of the partition wall portion 110 d located between the cooling flow passage 161 and the inverter accommodation portion 15 in the radial direction. The radial dimension of the portion 110 h positioned between the radial direction 52 and the radial direction is smaller than that of the portion 110 i positioned between the cooling flow path 161 and the inverter portion 51 in the radial direction. That is, the radial dimension L9 of the portion 110h is smaller than the radial dimension L7 of the portion 110i. As a result, the cooling flow passage 161 can be easily brought close to the condenser 52, and the condenser 52 can be cooled more easily. In the present modification, the upper surface of the partition wall portion 110d in contact with the capacitor portion 52 is located lower than the upper surface of the partition wall portion 110d on which the inverter portion 51 is installed.

The portion 110 k of the partition wall portion 110 d located between the cooling flow passage 161 and the stator accommodation portion 14 in the radial direction is located between the cooling flow passage 161 and the inverter accommodation portion 15 in the partition wall portion 110 d. The radial dimension is smaller than that of the located portion 110 j. That is, the radial dimension L8 of the portion 110k is smaller than the radial dimension L7 of the portion 110i and the radial dimension L9 of the portion 110h. As a result, the cooling flow passage 161 can be made closer to the stator accommodation portion 14 than the inverter accommodation portion 15, and the stator accommodation portion 14 can be more easily cooled. Thus, the dimensions L7, L8, and L9 satisfy the relationship of L8 <L9 <L7.

Second Embodiment
As shown in FIG. 8, in the cooling flow passage 261 of the cooling unit 260 of the present embodiment, the flow passage main portion 261 a has a plurality of first flow passage portions 262 a and a plurality of second flow passage portions 262 b. . Unlike the first embodiment, the flow path main body portion 261a does not have a widening portion. For example, twelve first flow path portions 262a are provided. For example, eleven second flow path portions 262 b are provided. The dimension of the circumferential direction θ of the first flow passage portion 262a is smaller than the dimension of the circumferential direction θ of the first flow passage portion 62a of the first embodiment. The dimension in the axial direction Y of the second flow passage portion 262b is smaller than the dimension in the axial direction Y of the second flow passage portion 62b in the first embodiment. Thereby, the flow passage cross-sectional area of the flow passage main portion 261a can be further reduced, and the flow velocity of the refrigerant can be improved. Therefore, the stator 30 and the inverter unit 51 can be cooled more.

The present invention is not limited to the above-described embodiment, and other configurations can be adopted. The flow passage body may have a central angle φ of 180 ° or less. The number of first flow path portions and the number of second flow path portions are not particularly limited. The first flow passage portion and the second flow passage portion may not be provided. For example, the cooling channel may be an arc-shaped channel extending in the circumferential direction θ.

The first direction and the second direction may not be parallel to each other. The inflow direction and the outflow direction may not be parallel to each other. The first direction and the inflow direction may be crossed or not orthogonal to each other. The second direction and the outflow direction may be crossed or not orthogonal to each other. The widening portion may be provided on any of the inner corner portions in each portion where the plurality of first flow passage portions and the plurality of second flow passage portions are connected, or may be provided on all of them. The shape of the inflow portion and the shape of the outflow portion are not particularly limited, and may be the same as or different from each other. The dimension in the inflow direction of the inflow portion may be uniform. The dimension in the outflow direction of the outflow may be uniform. The dimension in the inflow direction of the inflow portion and the dimension in the outflow direction of the outflow portion may be the same as or different from each other.

The dimension of the cooling channel in the axial direction Y, that is, the dimension of the first channel portion in the axial direction Y may be smaller than the dimension of the circuit board in the inverter portion in the axial direction Y. The dimension in the axial direction Y of the cooling channel may be larger than the dimension in the width direction X of the circuit board and the dimension in the width direction X of the capacitor portion.

Two or more cooling channels may be provided. In this case, two or more inlets, outlets, inlets and outlets provided for each cooling channel are also provided. In this case, the radial dimensions of the plurality of cooling channels and the dimensions in the axial direction Y may be different from each other or may be the same. Moreover, in this case, the shapes of the plurality of cooling channels may be different from each other or may be the same. The portion provided in the partition wall portion in the cooling flow path may not overlap with the inverter portion or may not overlap with the capacitor portion as viewed along the vertical direction Z.

The application of the motor of the embodiment described above is not particularly limited. The motor of the embodiment described above is mounted on, for example, a vehicle. Moreover, each structure mentioned above can be combined suitably in the range which does not contradiction mutually.

This application claims priority based on Japanese Patent Application No. 201-147116 filed on July 28, 2017, and uses the entire contents described in the Japanese patent application.

DESCRIPTION OF SYMBOLS 1 ... Motor, 10, 110 ... Housing, 10b ... Peripheral wall part, 10d, 110d ... Partition wall part 14 ... Stator accommodating part, 15 ... Inverter accommodating part, 20 ... Rotor, 21 ... Motor shaft, 30 ... Stator, 51 ... Inverter part 52: Condenser part 61, 161: Cooling channel, 61a, 261a: Channel body part, 61b: Inflow part, 61c: Outflow part, 61d: Inflow port, 61e: Outflow port, 62a, 262a ... 1 flow passage portion 62b, 262b second flow passage portion 62c widening portion J central axis X width direction (inflow direction, outflow direction) Y axial direction (first direction second direction) , Z ... vertical direction (third direction), θ ... circumferential direction

Claims (8)

A rotor having a motor shaft disposed along a central axis extending in one direction;
A stator that faces the rotor in the radial direction via a gap;
An inverter unit electrically connected to the stator;
A housing having a stator housing portion for housing the stator and an inverter housing portion for housing the inverter portion;
Equipped with
The inverter accommodating portion is located radially outward of the stator accommodating portion.
The housing has a cylindrical peripheral wall portion surrounding the rotor and the stator on the radially outer side of the rotor and the stator, and is a single member.
The peripheral wall portion is
A cooling channel,
A partition wall which partitions the stator housing portion and the inverter housing portion;
Have
At least a part of the cooling channel is provided in the partition wall portion,
The cooling channel is
A flow path main body,
An inlet through which the refrigerant flows,
An outlet from which the refrigerant flows out;
An inflow portion connected to the flow path main body and provided with the inflow port;
An outlet connected to the channel body and provided with the outlet;
Have
The first direction in which the refrigerant flows from the inflow portion toward the flow path main body intersects with the inflow direction in which the refrigerant flows from the inflow port into the inflow portion,
The second flow direction of the refrigerant flowing from the flow path main body toward the outflow portion intersects the outflow flow direction of the refrigerant flowing out from the outflow portion to the outflow port,
The dimension of the inflow direction of the inflow portion is larger than the dimension of the inflow direction of the portion of the flow path main body portion to which the inflow portion is connected,
The motor according to claim 1, wherein a dimension of the outflow portion in the outflow direction is larger than a dimension of the outflow direction in a portion of the flow path main body portion to which the outflow portion is connected. The first direction is orthogonal to the inflow direction,
The motor according to claim 1, wherein the second direction is orthogonal to the outflow direction. The first direction and the second direction are parallel to each other,
The motor according to claim 1, wherein the inflow direction and the outflow direction are parallel to each other. The flow path main body portion is
An axially extending first flow passage portion,
A second flow passage portion extending in a circumferential direction from an axial end of the first flow passage portion;
A widening portion which is provided at an inner corner in a portion where the first flow passage portion and the second flow passage portion are connected, and which is connected to both the first flow passage portion and the second flow passage portion;
The motor according to any one of claims 1 to 3, comprising: The flow path main body portion is
A plurality of first flow passage portions extending in the axial direction and arranged side by side along the circumferential direction;
A plurality of second flow path portions extending in the circumferential direction and connecting the first flow path portions adjacent in the circumferential direction;
The motor according to any one of claims 1 to 4, comprising: and extending in a wave shape along a circumferential direction. It further comprises a capacitor unit electrically connected to the inverter unit,
The inverter accommodating portion is located on one side of the stator accommodating portion in a third direction orthogonal to the axial direction.
The portion provided on the partition wall portion of the cooling flow passage, as viewed along the third direction, has a portion overlapping the inverter portion and a portion overlapping the capacitor portion. A motor according to any one of the preceding claims. In a portion of the partition wall portion located in the radial direction between the cooling flow path and the inverter accommodating portion, a portion located between the cooling flow path and the inverter portion in the radial direction is the cooling flow The motor according to claim 6, wherein a dimension in a radial direction is smaller than a portion positioned between the passage and the capacitor portion in the radial direction. The portion of the partition wall portion located between the cooling flow passage and the inverter accommodation portion in the radial direction is located between the cooling flow passage and the stator accommodation portion in the partition wall portion. The motor according to any one of claims 1 to 7, wherein the radial dimension is smaller than the portion to be cut.

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