JP2020162187A - motor - Google Patents

Abstract

To provide a motor having a structure capable of improving cooling efficiency of a stator and an inverter part caused by a cooling channel.SOLUTION: A housing has a cylindrical peripheral wall part and is formed of a single member. The peripheral wall part comprises a cooling channel, and a partition wall part partitioning a stator housing part and an inverter housing part from each other. At least a portion of the cooling channel is provided at the partition wall part. A first direction in which a coolant flows from an inflow part to a channel body part crosses an inflow direction in which a coolant flows from an inflow entrance into the inflow part. A second direction in which a coolant flows from the channel body part to an outflow part crosses an outflow direction in which a coolant flows out from an outflow part to an outflow opening. The dimension of the inflow direction of the inflow part is larger than the dimension in the inflow direction in a portion of the channel body part connected to the inflow part. The dimension in the outflow direction of the outflow part is larger than the dimension of the outflow direction in a portion of the channel body part connected to the outflow part.SELECTED DRAWING: Figure 5

Description

The present invention relates to a motor.

A motor in which a rotor, a stator, and an inverter device are housed in a housing and integrated is known. For example, Patent Document 1 describes a configuration in which a rotor, a stator, and an inverter device are arranged on a central axis in a housing.

Japanese Unexamined Patent Publication No. 2015-104257

In the above-mentioned motor, it is required that the stator and the inverter device can be cooled efficiently. As a method of cooling the stator and the inverter device, it is conceivable to provide a cooling flow path through which the refrigerant flows in the housing. However, if the cooling flow path is simply provided in the housing, the pressure loss of the refrigerant in the cooling flow path becomes large, and the cooling efficiency of the stator and the inverter device may not be sufficiently obtained.

In view of the above circumstances, one object of the present invention is to provide a motor having a structure capable of improving the cooling efficiency of the stator and the inverter portion by the cooling flow path.

One aspect of the motor of the present invention is a rotor having a motor shaft arranged along a central axis extending in one direction, a stator facing the rotor radially through a gap, and electrically the stator. A connected inverter unit, a stator accommodating portion accommodating the stator, and a housing having an inverter accommodating portion accommodating the inverter portion are provided, and the inverter accommodating portion is located radially outside the stator accommodating portion. The housing has a tubular peripheral wall portion that surrounds the rotor and the stator on the radial outer side of the rotor and the stator, and is a single member. The peripheral wall portion includes a cooling flow path and a cooling flow path. It has a partition wall portion that partitions the stator accommodating portion and the inverter accommodating portion, and at least a part of the cooling flow path is provided in the partition wall portion, and the cooling flow path is provided with a flow path main body portion. , The inflow port where the refrigerant flows in, the outflow port where the refrigerant flows out, the inflow portion which is connected to the flow path main body portion and is provided with the inflow port, and the outflow port which is connected to the flow path main body portion. The first direction in which the refrigerant flows from the inflow portion to the flow path main body portion, which has an outflow portion, intersects with the inflow direction in which the refrigerant flowing into the inflow portion from the inflow port intersects with the inflow direction. The second direction in which the refrigerant flows from the flow path main body to the outflow portion intersects with the outflow direction in which the refrigerant flows out from the outflow portion to the outflow port, and the dimension of the inflow direction of the inflow portion is The dimension of the outflow direction is larger than the dimension of the inflow direction in the portion of the flow path main body to which the inflow portion is connected, and the dimension of the outflow direction is the dimension of the outflow direction in the portion of the flow path main body to which the outflow portion is connected. Is larger than the size of.

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

FIG. 1 is a perspective view showing a motor of the first embodiment. FIG. 2 is a diagram showing a motor of the first embodiment, and is a sectional view taken along line II-II in FIG. FIG. 3 is a diagram showing a motor of the first embodiment, and is a sectional view taken along line III-III in FIG. FIG. 4 is a view of the motor of the first embodiment as viewed from above. 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 the motor of the modified example in the first embodiment. FIG. 8 is a perspective view showing the cooling unit of the second embodiment.

The Z-axis direction shown in each figure 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 figure, and is a direction orthogonal to the vertical direction Z. In the following description, the 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 "one side in the axial direction", and the negative side in the axial direction Y is referred to as "the other side in the axial direction". The X-axis direction shown in each figure 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 called "one side in the width direction", and the negative side in the width direction X is called "the other side in the width direction". In this embodiment, the vertical direction Z corresponds to the third direction.

Further, the radial direction centered on the central axis J is simply referred to as "diameter direction", and the circumferential direction centered on the central axis J is simply referred to as "circumferential direction θ". Further, in the circumferential direction θ, the side that advances clockwise when viewed from the other side in the axial direction toward one side in the axial direction, that is, the advancing side of the arrow indicating the circumferential direction θ in the figure is called “one side in the circumferential direction”. The side traveling counterclockwise, that is, the side opposite to the traveling side of the arrow indicating the circumferential direction θ in the figure is called "the other side in the circumferential direction".

The vertical direction, the upper side, and the lower side are names for simply explaining the relative positional relationship of each part, and the actual arrangement relationship, etc. is an arrangement relationship, etc. other than the arrangement relationship, etc. indicated by these names. You may.

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

As shown in FIG. 2, the housing 10 houses 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 square tube portion 10e.

The peripheral wall portion 10b has a tubular shape that surrounds the rotor 20 and the stator 30 on the radial outer side of the rotor 20 and the stator 30. In the present embodiment, the peripheral wall portion 10b has a substantially cylindrical shape centered on the central axis J. The peripheral wall portion 10b opens on one side in the axial direction. The peripheral wall portion 10b has a cooling portion 60 for cooling the stator 30 and the inverter unit 50.

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

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

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

The inverter accommodating portion 15 is located on the radial outer side of 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 accommodating portion 14 and the inverter accommodating portion 15 are partitioned in the vertical direction Z by the partition wall portion 10d. The partition wall portion 10d is an upper portion of the peripheral wall portion 10b. That is, the peripheral wall portion 10b has a partition wall portion 10d that partitions the stator accommodating portion 14 and the inverter accommodating portion 15.

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

The lid portion 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 square cylinder portion 10e. The lid portion 11 closes the opening on the upper side of the square cylinder portion 10e. In FIG. 4, the lid portion 11 is not shown. 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 the surface of the peripheral wall portion 10b and the square tube portion 10e on one side in the axial direction. The cover member 12 closes the opening on one side in the axial direction 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 12a 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 protruding from the peripheral edge portion of the output shaft hole 12a on the other side surface in the axial direction of the cover member 12 to the other side in the axial direction. The bearing holding portion 12b holds a bearing that supports the motor shaft 21 on one side in the axial direction with respect to the rotor core 22 described later.

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

The rotor 20 includes 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 on both sides in the axial direction. The end portion of the motor shaft 21 on one side in the axial direction projects from the opening on one side in the axial direction of the peripheral wall portion 10b toward one side in the axial direction. The end portion of the motor shaft 21 on one side in the axial direction passes through the output shaft hole 12a and projects toward one side in the axial direction from the cover member 12. The end of the motor shaft 21 on the other side in the axial direction is inserted into the sensor housing portion 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 provided in the rotor core 22 that penetrates the rotor core 22 in the axial direction Y. The first end plate 24 and the second end plate 25 have an annular plate shape that extends in the radial direction. The first end plate 24 and the second end plate 25 sandwich the rotor core 22 in the axial direction Y in a state of being in contact with the rotor core 22. The first end plate 24 and the second end plate 25 press the magnet 23 inserted in 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 with 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 portion 10b. The stator core 31 faces the outer side of the rotor core 22 in the radial direction with a gap.

The inverter unit 50 controls the electric 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 section 51 is housed in the inverter accommodating section 15. The inverter section 51 includes a first circuit board 51a and a second circuit board 51b. The first circuit board 51a and the second circuit board 51b have a plate shape whose plate surface is orthogonal to the vertical direction Z. The second circuit board 51b is arranged apart from the upper side of the first circuit board 51a. The first circuit board 51a and the second circuit board 51b are electrically connected. A coil wire 32a is connected to the first circuit board 51a via the connector terminal 53. As a result, the inverter section 51 is electrically connected to the stator 30.

As shown in FIGS. 2 and 4, the capacitor portion 52 has a rectangular parallelepiped shape that is long in the width direction X. The capacitor section 52 is housed in the inverter accommodating section 15. The capacitor portion 52 is arranged on the other side in the axial direction of the inverter portion 51. 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 section 52 is electrically connected to the inverter section 51. As shown in FIG. 2, the capacitor portion 52 is fixed to the upper surface of the partition wall portion 10d. The capacitor portion 52 comes into contact with the partition wall portion 10d.

As shown in FIG. 1, the connector portion 18 is provided on the surface of the square cylinder portion 10e on the other side in the width direction. An external power supply (not shown) is connected to the connector unit 18. Power is supplied to the inverter unit 50 from an external power source 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) type resolver. As shown in FIG. 2, the rotation detection unit 70 is housed in the sensor housing unit 10g. That is, the rotation detection unit 70 is arranged on the bottom wall portion 10a. The rotation detection unit 70 includes a detected unit 71 and a sensor unit 72.

The detected portion 71 is an annular shape extending in the circumferential direction θ. The detected portion 71 is fitted and fixed to the motor shaft 21. The detected portion 71 is made of a magnetic material. The sensor unit 72 is an annular shape that surrounds the radially outer side of the detected unit 71. The sensor unit 72 is fitted into the sensor housing unit 10 g. 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 sensor wiring 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 into the inverter accommodating portion 15 through the through hole that 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.

As the detected unit 71 rotates together with the motor shaft 21, an induced voltage is generated in the coil of the sensor unit 72 according to the circumferential position of the detected unit 71. The sensor unit 72 detects the rotation of the detected unit 71 by detecting the induced voltage. As a result, 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 flow path 61. That is, the peripheral wall portion 10b has a cooling flow path 61. In the present embodiment, the cooling unit 60 is composed of only one cooling flow path 61. In FIG. 5, the internal space of the cooling unit 60 is shown as a three-dimensional shape.

Refrigerant flows through the cooling flow path 61. The refrigerant is not particularly limited as long as it is a fluid that can cool the stator 30 and the inverter section 51. The refrigerant may be water, a liquid other than water, or a gas.

The cooling flow path 61 extends in the circumferential direction θ as a whole. The cooling flow path 61 has a flow path main body portion 61a, an inflow portion 61b, an outflow portion 61c, an inflow port 61d, and an outflow port 61e. The flow path main body 61a extends in a wavy shape along the circumferential direction θ. More specifically, as shown in FIGS. 3 and 5, the flow path main body portion 61a substantially goes around the peripheral wall portion 10b in a wavy shape along the circumferential direction θ from the portion of the peripheral wall portion 10b on the other side in the width direction. Is provided. As shown in FIG. 3, the central angle φ of the flow path main body 61a is larger than 180 °.

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

The widening portion 62c is provided at the inner corner of the portion where the first flow path portion 62a and the second flow path portion 62b are connected, and is provided with both the first flow path portion 62a and the second flow path portion 62b. Connect. In the present specification, the "inner corner portion in the portion where the first flow path portion and the second flow path portion are connected" refers to the first flow path portion toward the second flow path portion or the second flow path. It is an inner corner portion in a curved portion of the flow path main body portion that bends from the road portion toward the first flow path portion.

The widening portion 62c is configured such that the inner corner portion at the portion where the first flow path portion 62a and the second flow path portion 62b are connected is bulged. The widening portion 62c increases the dimensions of the flow path main body portion 61a in the circumferential direction θ and the axial direction Y at the connecting portion between the first flow path portion 62a and the second flow path portion 62b. More specifically, in the widening portion 62c, at the connecting portion between the first flow path portion 62a and the second flow path portion 62b, in the first flow path portion 62a, the dimension of the flow path main body portion 61a in the circumferential direction θ is increased. In the second flow path portion 62b, the dimension of the flow path main body portion 61a in the axial direction Y is increased.

In the present embodiment, the widening portion 62c is a connecting portion between the first flow path portion 62a and the second flow path portion 62b arranged on the other side in the most circumferential direction, and the first flow path arranged on one side in the most circumferential direction. One is provided at each connecting portion between the portion 62a and the second flow path portion 62b. The first flow path portion 62a arranged on the other side in the most circumferential direction is the first flow path portion 62a located on the most upstream side in the cooling flow path 61, and is the first flow path portion 62a connected to the inflow portion 61b. Is. The first flow path portion 62a arranged on one side in the most circumferential direction is the first flow path portion 62a located on the most downstream side in the cooling flow path 61, and is the first flow path portion 62a connected to the outflow portion 61c. Is.

The inflow portion 61b is connected to the flow path main body portion 61a. More specifically, the inflow portion 61b is connected to the end portion of the flow path main body portion 61a on the other side in the circumferential direction. In the present embodiment, the end portion on the other side in the circumferential direction of the flow path main body portion 61a is the first flow path portion 62a arranged on the other side in the circumferential direction. The inflow portion 61b is connected to one side in the axial direction of the first flow path portion 62a arranged on the other side in the circumferential direction. The inflow port 61b is provided with an inflow port 61d.

The outflow portion 61c is connected to the flow path main body portion 61a. More specifically, the outflow portion 61c is connected to one end of the flow path main body portion 61a in the circumferential direction. In the present embodiment, the end portion on one side in the circumferential direction of the flow path main body portion 61a is the first flow path portion 62a arranged on one side in the circumferential direction. The outflow portion 61c is connected to one side in the axial direction of the first flow path portion 62a arranged on one side in the circumferential direction. The outflow portion 61c is provided with an outflow port 61e. The inflow portion 61b and the outflow portion 61c are arranged at the same positions in the axial direction Y and the width direction X. The inflow portion 61b and the outflow portion 61c are arranged at intervals in the vertical direction Z. The shape of the inflow portion 61b and the shape of the outflow portion 61c are symmetrical in the vertical direction Z.

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

The outflow port 61e projects from the outflow portion 61c to the other side in the width direction. Refrigerant flows out from the outflow port 61e. The cross-sectional shape of the outlet 61e orthogonal to the width direction X is, for example, a circular shape. The shape of the outflow port 61e is the same as the shape of the inflow port 61d. As shown in FIG. 5, the inflow port 61d and the outflow port 61e are arranged at the same position in the axial direction Y. The inflow port 61d and the outflow port 61e are arranged at intervals in the vertical direction Z.

As shown in FIG. 3, an outflow pipe 17 is connected to the outflow port 61e. 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 arranged at the same position in the axial direction Y. The inflow pipe 16 and the outflow pipe 17 are arranged at intervals in the vertical direction Z.

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

As shown in FIG. 5, in the present embodiment, the inflow direction of the refrigerant flowing from the inflow port 61d to the inflow portion 61b is parallel to the width direction X. The inflow direction is from the other side in the width direction to one side in the width direction. The first direction in which the refrigerant flows from the inflow portion 61b toward the flow path main body portion 61a is a direction parallel to the axial direction Y. The first direction is a direction from one side in the axial direction to the other side in the axial direction. The first direction in which the refrigerant flows from the inflow portion 61b toward the flow path main body portion 61a intersects with the inflow direction in which the refrigerant flowing into the inflow portion 61b from the inflow port 61d flows. In this 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 body portion 61a to the outflow portion 61c is a direction parallel to the axial direction Y. The second direction is a direction from the other side in the axial direction to the 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 a direction parallel to the width direction X. The outflow direction is from one side in the width direction to the other side in the width direction. The second direction in which the refrigerant flows from the flow path main body 61a toward the outflow portion 61c intersects with the outflow direction in which the refrigerant flowing out from the outflow portion 61c to the outflow port 61e flows. In this 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 inflow port 61d and the outflow port 61e can be easily arranged on the same side surface of the housing 10, and the refrigerant can easily flow into the cooling flow path 61.

The dimension of the inflow portion 61b in the inflow direction is larger than the dimension of the inflow direction in the portion of the flow path main body portion 61a to which the inflow portion 61b is connected. In the present embodiment, the inflow direction dimension of the inflow portion 61b is the width direction X dimension of the inflow portion 61b. The dimension in the inflow direction in the portion of the flow path main body portion 61a to which the inflow portion 61b is connected is the dimension in the width direction X in the first flow path portion 62a arranged on the other side in the circumferential direction. The dimension of the inflow portion 61b in the inflow direction becomes smaller from the upper side to the lower side.

The size of the outflow portion 61c in the outflow direction is larger than the size of the outflow direction in the portion of the flow path main body 61a to which the outflow portion 61c is connected. In the present embodiment, the size of the outflow portion 61c in the outflow direction is the dimension of the outflow portion 61c in the width direction X. The dimension in the outflow direction in the portion of the flow path main body portion 61a to which the outflow portion 61c is connected is the dimension in the width direction X in the first flow path portion 62a arranged on one side in the circumferential direction. The size of the outflow portion 61c in the outflow direction decreases from the lower side to the upper side.

For example, when the refrigerant flows across two intersecting flow paths, when the refrigerant flows from one flow path to the other flow direction and the flow direction changes, the comparison is made by a sudden change in the flow direction. 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 from the inflow direction to the first direction intersecting the inflow direction, is such that the refrigerant flows in from the inflow portion 61b. It is larger than the dimension in the inflow direction in the portion of the flow path main body 61a to be formed. Therefore, in the inflow portion 61b, the flow direction of the refrigerant can be changed relatively slowly from the inflow direction to the first direction. As a result, the pressure loss generated in the refrigerant flowing from the inflow port 61d to the flow path main body 61a via the inflow portion 61b can be reduced.

Further, according to the present embodiment, the dimension of the outflow direction in 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 connected to the outflow portion 61c. It is larger than the size in the outflow direction in the portion 61a. Therefore, in the outflow portion 61c, the flow direction of the refrigerant can be changed relatively slowly from the second direction to the outflow direction. As a result, the pressure loss generated in the refrigerant flowing from the flow path main body portion 61a to the outflow port 61e via the outflow portion 61c can be reduced.

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

As shown in FIG. 6, at least a part of the cooling flow path 61 is provided in the partition wall portion 10d. Therefore, the stator accommodating portion 14 and the inverter accommodating portion 15 partitioned by the partition wall portion 10d can be cooled by the refrigerant flowing through the cooling flow path 61, and the stator 30 and the inverter accommodating portion 15 accommodated in the stator accommodating portion 14 can be cooled. The inverter section 51 housed in the can be cooled. Then, as described above, according to the present embodiment, the pressure loss of the refrigerant flowing in the cooling flow path 61 can be reduced, and the refrigerant can flow efficiently. As a result, it is possible to suppress a decrease in the flow velocity of the refrigerant, and it is easy to cool the stator 30 and the inverter section 51. 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 section 51 by the cooling flow path 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, pressure loss may be particularly likely to occur when the direction in which the refrigerant flows changes from the first direction to the inflow direction and when the direction in which the refrigerant flows changes from the second direction to the outflow direction. .. Therefore, the above-mentioned 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, a widening portion 62c is provided at the inner corner portion of the portion where the first flow path portion 62a and the second flow path portion 62b are connected. Therefore, the width of the cooling flow path 61 can be increased in the portion where the first flow path portion 62a and the second flow path portion 62b are connected. As a result, when the refrigerant flows from the first flow path portion 62a extending in the axial direction Y to the second flow path portion 62b extending in the circumferential direction θ, the direction in which the refrigerant flows is changed to the first flow path including the widening portion 62c. At the connecting portion between the portion 62a and the second flow path portion 62b, the axial direction Y can be gradually changed to the circumferential direction θ. Further, when the refrigerant flows from the second flow path portion 62b into the first flow path portion 62a, the direction in which the refrigerant flows is set between the first flow path portion 62a including the widening portion 62c and the second flow path portion 62b. At the connecting portion, the circumferential direction θ can be gradually changed to the axial direction Y. Therefore, the pressure loss of the refrigerant in the cooling flow path 61 can be further reduced.

Further, according to the present embodiment, the flow path main body portion 61a extends in a wavy shape along the circumferential direction θ. Therefore, the flow path main body 61a can be arranged over a relatively wide range while reducing the width of the flow path main body 61a to reduce the cross section of the flow path main body 61a. As a result, the flow velocity of the refrigerant flowing in the flow path main body 61a can be made relatively large, and the cooling efficiency of the stator 30 and the inverter 51 by the refrigerant can be improved. Further, the flow path main body portion 61a can cool a relatively wide range of the stator accommodating portion 14 and the inverter accommodating portion 15, and can further cool the stator 30 and the inverter portion 51.

In the present embodiment, the refrigerant flowing into the cooling flow path 61 includes the upper end portion of the peripheral wall portion 10b, that is, the partition wall portion 10d, the end portion on one side of the peripheral wall portion 10b in the width direction, and the lower end portion of the peripheral wall portion 10b. Flow through in order. Therefore, the refrigerant having a relatively low temperature immediately after flowing into the cooling flow path 61 from the inflow port 61d can flow to the partition wall portion 10d, and the inverter portion 51 can be cooled. This makes it easier to cool the inverter section 51. Since the inverter section 51 tends to generate a large amount of heat, it is easy to cool the inverter section 51, so that the motor 1 can be cooled more preferably.

In the present embodiment, the portion of the cooling flow path 61 provided on the partition wall portion 10d is a single-layer flow path between the stator accommodating portion 14 and the inverter portion 51 in the radial direction. Therefore, the configuration of the cooling flow path 61 can be simplified as compared with the case where the flow paths of a plurality of layers are provided side by side in the radial direction. As a result, both the stator 30 and the inverter section 51 can be cooled by the single-layer cooling flow path 61, which is efficient. Further, the radial dimension 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 section 51 by the cooling flow path 61 can be obtained.

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

Further, according to the present embodiment, the flow path main body portion 61a has a central angle φ larger than 180 °. Therefore, the cooling flow path 61 can easily surround the stator 30, and the stator 30 can be cooled more.

Further, according to the present embodiment, the condenser portion 52 housed in the inverter accommodating unit 15 can also be cooled by the cooling flow path 61. As a result, three parts can be cooled at the same time by one cooling flow path 61, and cooling can be performed more efficiently while reducing the number of cooling flow paths 61.

In the present embodiment, the upper portion of the flow path main body portion 61a is provided on the partition wall portion 10d. As shown in FIG. 6, when viewed along the vertical direction Z, the portion of the cooling flow path 61 provided on the partition wall portion 10d has a portion overlapping the inverter portion 51 and a portion overlapping the condenser portion 52. .. Therefore, it is easier to cool the stator 30, the inverter section 51, and the capacitor section 52 by the refrigerant flowing in the cooling flow path 61.

Further, as described above, in the present embodiment, the capacitor portion 52 comes into contact with the partition wall portion 10d. Therefore, the heat of the condenser portion 52 is likely to be released to the refrigerant in the cooling flow path 61 through the partition wall portion 10d. Therefore, the cooling flow path 61 makes it easier to cool the condenser portion 52.

In the portion 10j of the partition wall portion 10d located between the cooling flow path 61 and the inverter accommodating portion 15 in the radial direction, the portion 10i located between the cooling flow path 61 and the inverter portion 51 in the radial direction is cooled. The radial dimension is smaller than the portion 10h located 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 path 61 can be brought closer to the inverter section 51, and the inverter section 51 can be cooled more easily.

In the present embodiment, the portion 10i includes a portion of the partition wall portion 10d located between the first flow path portion 62a and the inverter portion 51 in the radial direction, and the second flow path portion 62b of the partition wall portion 10d and the inverter. A portion located between the portion 51 and the radial direction is included. The portion 10h is a portion of the partition wall portion 10d located between the first flow path portion 62a and the capacitor portion 52 in the radial direction, and the partition wall portion 10d of the second flow path portion 62b and the capacitor portion 52. Includes portions located between the radial directions.

The portion 10j of the partition wall portion 10d located between the cooling flow path 61 and the inverter accommodating portion 15 in the radial direction is located between the cooling flow path 61 and the stator accommodating portion 14 of the partition wall portion 10d in the radial direction. 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 path 61 can be brought closer to the inverter accommodating portion 15 than the stator accommodating portion 14, and the inverter accommodating portion 15 can be cooled more easily. Further, since the dimension L2 can be relatively increased, the radial dimension of the peripheral wall portion 10b in contact with the stator core 31 can be easily increased. As a result, the strength of holding the stator core 31 in the peripheral wall portion 10b can be relatively increased. As described above, the dimension L1, the dimension L2, and the dimension L3 satisfy the relationship of L1 <L3 <L2.

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

The dimension L4 in the axial direction Y of the cooling flow path 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 path 61 can be made relatively large, and the range that can be cooled by one cooling flow path 61 can be widened. Further, the flow rate of the refrigerant flowing in the cooling flow path 61 can be increased. Therefore, the cooling efficiency of the cooling flow path 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 path 61 is the dimension in the axial direction Y of the first flow path portion 62a.

The dimension L4 in the axial direction Y of the cooling flow path 61 is larger than the dimension L4 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 path 61 is smaller than the dimension L4 in the width direction X of the second circuit board 51b and the dimension X in the width direction X of the condenser portion 52. Although not shown, the dimension L4 in the axial direction Y of the cooling flow path 61 is smaller than the dimension L4 in the width direction X of the first circuit board 51a.

The maximum dimension of the cooling flow path 61 in the width direction X is larger than the dimension of the width direction X of the second circuit board 51b and the dimension of the capacitor portion 52 in the width direction X. Although not shown, the maximum dimension of the cooling flow path 61 in the width direction X is larger than the dimension of the first circuit board 51a in the width direction X. Therefore, the cooling flow path 61 makes it easier to cool the inverter section 51 and the capacitor section 52. The maximum dimension of the cooling flow path 61 in the width direction X is the width between the portion of the cooling flow path 61 located on one side in the width direction and the portion of the cooling flow path 61 located on the other side of the width direction. The distance in the direction X. In the present embodiment, the maximum dimension of the cooling flow path 61 in the width direction X corresponds to the outer diameter of the flow path main body 61a.

In the present embodiment, the cooling unit 60 is formed by a sand mold portion 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 the sand mold forming the cooling portion 60. After the housing 10 is manufactured by sand casting, the sand mold for forming the cooling portion 60 is discharged from the discharge hole portion 19. The discharge hole portion 19 is connected to the cooling portion 60. The plug 80 is press-fitted into the discharge hole 19. The discharge hole portion 19 is closed by the plug body 80, and the refrigerant in the cooling portion 60 can be prevented from leaking to the outside of the housing 10.

(Modified example of the first embodiment)
As shown in FIG. 7, in the housing 110 of the present modification, the cooling flow path 161 and the condenser portion are located in the portion 110j of the partition wall portion 110d located between the cooling flow path 161 and the inverter accommodating portion 15 in the radial direction. The portion 110h located between the cooling flow path 161 and the inverter portion 51 has a smaller radial dimension than the portion 110i located 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 path 161 can be easily brought closer to the condenser portion 52, and the condenser portion 52 can be more easily cooled. In this modification, the upper surface of the partition wall portion 110d with which the capacitor portion 52 contacts is located below the upper surface of the partition wall portion 110d in which the inverter portion 51 is installed.

The portion 110k of the partition wall portion 110d located between the cooling flow path 161 and the stator accommodating portion 14 is located between the partition wall portion 110d in the radial direction of the cooling flow path 161 and the inverter accommodating portion 15. The radial dimension is smaller than the located portion 110j. 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 path 161 can be brought closer to the stator accommodating portion 14 than the inverter accommodating portion 15, and the stator accommodating portion 14 can be cooled more easily. As described above, the dimension L7, the dimension L8, and the dimension L9 satisfy the relationship of L8 <L9 <L7.

<Second Embodiment>
As shown in FIG. 8, in the cooling flow path 261 of the cooling unit 260 of the present embodiment, the flow path main body portion 261a has a plurality of first flow path portions 262a and a plurality of second flow path portions 262b. .. 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, 11 second flow path portions 262b are provided. The dimension of the first flow path portion 262a in the circumferential direction θ is smaller than the dimension of the first flow path portion 62a of the first embodiment in the circumferential direction θ. The dimension of the second flow path portion 262b in the axial direction Y is smaller than the dimension of the second flow path portion 62b of the first embodiment in the axial direction Y. As a result, the cross-sectional area of the flow path of the flow path main body 261a can be made smaller, and the flow velocity of the refrigerant can be improved. Therefore, the stator 30 and the inverter section 51 can be further cooled.

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

The first direction and the second direction do not have to be parallel to each other. The inflow direction and the outflow direction do not have to be parallel to each other. The first direction and the inflow direction may intersect and do not have to be orthogonal to each other. The second direction and the outflow direction may intersect and do not have to be orthogonal to each other. The widening portion may be provided at any of the inner corners of each portion where the plurality of first flow paths and the plurality of second flow paths are connected, or may be provided at 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 each other or may be different from each other. The dimensions of the inflow portion in the inflow direction may be uniform. The dimensions of the outflow portion in the outflow direction may be uniform. The dimensions of the inflow portion in the inflow direction and the dimensions of the outflow portion in the outflow direction may be the same as each other or may be different from each other.

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

Two or more cooling channels may be provided. In this case, two or more inflow ports, outflow ports, inflow sections, and outflow sections are also provided for each cooling flow path. In this case, the radial dimension and the axial dimension of the plurality of cooling channels may be different from each other or may be the same. Further, in this case, the shapes of the plurality of cooling channels may be different from each other or may be the same. The portion of the cooling flow path provided on the partition wall portion may not overlap with the inverter portion or may not overlap with the condenser portion when viewed along the vertical direction Z.

The application of the motor of the above-described embodiment is not particularly limited. The motor of the above-described embodiment is mounted on a vehicle, for example. In addition, the above-mentioned configurations can be appropriately combined within a range that does not contradict each other.

1 ... Motor, 10,110 ... Housing, 10b ... Circumferential wall, 10d, 110d ... Partition wall, 14 ... Stator housing, 15 ... Inverter housing, 20 ... Rotor, 21 ... Motor shaft, 30 ... Stator, 51 ... Inverter section, 52 ... Condenser section, 61, 161 ... Cooling flow path, 61a, 261a ... Flow path body section, 61b ... Inflow section, 61c ... Outflow section, 61d ... Inflow port, 61e ... Outlet, 62a, 262a ... 1 flow path portion, 62b, 262b ... 2nd flow path 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 with a motor shaft arranged along a central axis extending in one direction,
A stator facing the rotor in the radial direction through a gap,
An inverter unit that is electrically connected to the stator,
A housing having a stator accommodating portion for accommodating the stator and an inverter accommodating portion for accommodating the inverter portion,
With
The inverter accommodating portion is located on the radial outer side of the stator accommodating portion.
The housing has a tubular peripheral wall portion that surrounds the rotor and the stator on the radial outer side of the rotor and the stator, and is a single member.
The peripheral wall portion
Cooling flow path and
A partition wall portion that separates the stator accommodating portion and the inverter accommodating portion,
Have,
At least a part of the cooling flow path is provided in the partition wall portion.
The cooling flow path is
Flow path body and
The inlet where the refrigerant flows in and
The outlet from which the refrigerant flows and
An inflow portion connected to the flow path main body portion and provided with the inflow port,
An outflow portion connected to the flow path main body portion 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 into the inflow portion from the inflow port.
The second direction in which the refrigerant flows from the flow path main body to the outflow portion intersects with the outflow direction in which the refrigerant flows out from the outflow portion to the outflow port.
The dimension of the inflow portion in the inflow direction is larger than the dimension of the inflow direction in the portion of the flow path main body to which the inflow portion is connected.
A motor in which the dimension of the outflow portion in the outflow direction is larger than the dimension of the outflow direction in the portion of the flow path main body to which the outflow portion is connected. The first direction is orthogonal to the inflow direction and
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 and
The motor according to claim 1 or 2, wherein the inflow direction and the outflow direction are parallel to each other. The flow path main body
The first flow path extending in the axial direction and
A second flow path portion extending in the circumferential direction from the axial end portion of the first flow path portion,
A widening portion provided at the inner corner of the portion where the first flow path portion and the second flow path portion are connected and connecting to both the first flow path portion and the second flow path portion,
The motor according to any one of claims 1 to 3. The flow path main body
A plurality of first flow paths 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 to each other in the circumferential direction,
The motor according to any one of claims 1 to 4, which has the above and extends in a wavy shape along the circumferential direction. Further provided with a capacitor section electrically connected to the inverter section
The inverter accommodating portion is located on one side of the stator accommodating portion in a third direction orthogonal to the axial direction.
Claims 1 to 5 include a portion of the cooling flow path provided on the partition wall portion when viewed along the third direction, and a portion overlapping the inverter portion and a portion overlapping the condenser portion. The motor according to any one of the above. In the portion of the partition wall portion located between the cooling flow path and the inverter accommodating portion in the radial direction, the 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 the dimension in the radial direction is smaller than the portion located between the path and the capacitor portion in the radial direction. The portion of the partition wall portion located between the cooling flow path and the inverter accommodating portion in the radial direction is located between the cooling flow path and the stator accommodating portion in the radial direction of the partition wall portion. The motor according to any one of claims 1 to 7, wherein the size in the radial direction is smaller than that of the portion.

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