CN219420449U - Rotating electrical machine and driving device - Google Patents

Abstract

The present utility model provides a rotary electric machine and a driving device, the rotary electric machine including: a rotor, a stator, a cylindrical housing, and a flow path; the flow path has: an inflow port communicating with the outside of the flow path and through which the refrigerant flows into the flow path, and an outflow port through which the refrigerant flows out of the flow path; wherein a temperature sensor for measuring the temperature of the coil is located at the coil end on the outflow side. Thus, the present utility model can measure the coil temperature at the higher temperature part by the temperature sensor arranged at the coil end part at the outflow port side, thereby properly measuring the temperature of the stator and improving the measurement accuracy of the temperature sensor.

Description

Rotating electrical machine and driving device

Technical Field

The utility model relates to the field of electromechanics, in particular to a rotating motor and a driving device.

Background

The rotary electric machine includes a rotor, a stator, and a housing holding the stator inside. A cooling jacket may be provided in the wall of the housing throughout the entire circumference in the circumferential direction of the stator. The cooling jacket includes channels through which a liquid coolant is circulated. For example, reference may be made to patent document 1: japanese patent publication 2011-015536.

It should be noted that the foregoing description of the background art is only for the purpose of providing a clear and complete description of the technical solution of the present utility model and is presented for the convenience of understanding by those skilled in the art. The above-described solutions are not considered to be known to the person skilled in the art simply because they are set forth in the background of the utility model section.

Disclosure of Invention

The inventors have found that existing rotating electrical machines have a cooling jacket that cools the rotating electrical machine. Since the temperature of the refrigerant flowing through the cooling jacket is higher at the outlet than at the inlet, the temperature of the stator cooled by the cooling jacket differs between the inlet side and the outlet side.

If a temperature sensor such as a thermistor sensor for measuring the temperature of a coil in a stator is provided in a rotating electrical machine, the coil temperature at a lower temperature portion may be measured without taking the position of the temperature sensor into consideration, and thus the temperature of the stator may not be properly measured, resulting in inaccurate measurement results of the temperature sensor.

In order to solve at least one of the above problems or other similar problems, embodiments of the present utility model provide a rotary electric machine and a driving device. The temperature of the stator can be appropriately measured in consideration of the setting position of the temperature sensor, and the measurement accuracy of the temperature sensor is improved.

According to a first aspect of an embodiment of the present utility model, there is provided a rotary electric machine including:

a rotor that rotates around a central axis;

a stator having a stator core located radially outward of the rotor, a coil, and coil ends protruding from the stator core of the coils toward both axial ends;

a cylindrical housing that surrounds the stator from a radially outer side; and

a flow path which is arranged on at least one of a peripheral wall portion of the casing and an outer peripheral portion of the stator and through which a refrigerant flows;

the flow path has: an inflow port communicating with the outside of the flow path and through which the refrigerant flows into the flow path, and an outflow port through which the refrigerant flows out of the flow path; wherein a temperature sensor for measuring the temperature of the coil is located at the coil end on the outflow port side.

In some embodiments, the temperature sensor is a thermistor.

In some embodiments, the thermistor is fixed to the coil end by a rope or a wire harness, or the thermistor is sandwiched between wires of the coil end, or the thermistor is held to the coil end by a resin member, or the thermistor is welded to the coil end.

In some embodiments, an inverter unit is provided on the housing, and the temperature sensor is electrically connected to the inverter unit.

In some embodiments, a temperature sensor is further disposed on one side of the inflow port; the flow of the refrigerant in the flow path is controlled based on a difference between a temperature detected by a temperature sensor provided on the outflow port side and a temperature detected by a temperature sensor provided on the inflow port side.

In some embodiments, the temperature sensor on the inflow port side is located at the inverter unit.

In some embodiments, the flow path has: the axial position of the spiral flow path portion is shifted in a circumferential direction around the central axis.

In some embodiments, the temperature sensor is located circumferentially inside the outflow opening in the coil end.

In some embodiments, the inflow opening is open toward the gravitational upper side and the outflow opening is open toward the gravitational lower side.

In some embodiments, the flow path has: an axial flow path portion parallel to a circumferential direction around the central axis, and a serpentine flow path portion connecting the axial flow path portions.

In some embodiments, the temperature sensor is located circumferentially inside the axial flow path portion provided with the outflow port.

In some embodiments, the temperature sensor is located at the coil end near the outflow opening in the axial direction.

In some embodiments, the temperature sensor is rod-shaped, having a length of 1cm to 3cm.

According to a second aspect of embodiments of the present utility model, there is provided a driving device comprising a rotary electric machine as described above.

One of the beneficial effects of the embodiment of the utility model is that: a temperature sensor for measuring the temperature of the coil is positioned at the outflow opening

A coil end portion on one side; therefore, the utility model can measure the coil temperature of the part with higher temperature, thereby being capable of properly measuring the temperature of the stator and improving the measurement accuracy of the temperature sensor.

Specific embodiments of the utility model are disclosed in detail below with reference to the following description and drawings, indicating the manner in which the principles of the utility model may be employed. It should be understood that the embodiments of the utility model are not limited in scope thereby. The embodiments of the utility model include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Features described and/or illustrated with respect to one embodiment may be combined in the same or similar manner in one or more of the following

Used in other embodiments, in combination with or instead of the features of the other embodiments.

Drawings

The accompanying drawings are included to provide a further understanding of embodiments of the utility model, and constitute a specification

And in part, are presented to illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the utility model. It will be apparent to those skilled in the art from this disclosure that the drawings in the following description are only examples of embodiments of the utility model and that other drawings may be made without undue burden to those skilled in the art

A drawing. In the drawings:

FIG. 1 is a schematic diagram of a rotating electrical machine according to an embodiment of the present application;

FIG. 2 is a schematic view of a spiral flow path portion according to an embodiment of the present application;

fig. 3 is another schematic view of a rotating electrical machine according to an embodiment of the present application;

FIG. 4 is a schematic view of a serpentine flow path portion according to an embodiment of the present application;

fig. 5 is another schematic view of a serpentine flow path portion according to an embodiment of the present application.

Detailed Description

The foregoing and other features of the utility model will become apparent from the following description, taken in conjunction with the accompanying drawings. In the specification and drawings, there have been specifically disclosed specific embodiments of the utility model that are indicative of some of the embodiments in which the principles of the utility model may be employed, it being understood that the utility model is not limited to the described embodiments but, on the contrary, is intended to cover all modifications, variations and equivalents falling within the scope of the appended claims.

In the drawings used in the following description, the components are made to be distinguishable on the drawing, and therefore, the scale differs for each component, and the present application is not limited to the number of components, the shape of the components, the scale of the size of the components, and the relative positional relationship of the components described in these drawings.

In the embodiments of the present application, the terms "first," "second," and the like are used to distinguish between different elements from each other by reference, but do not denote a spatial arrangement or a temporal order of the elements, and the elements should not be limited by the terms. The term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprises," "comprising," "including," "having," and the like, are intended to reference the presence of stated features, elements, components, or groups of components, but do not preclude the presence or addition of one or more other features, elements, components, or groups of components.

In the embodiments of the present application, the singular forms "a," an, "and" the "include plural referents and should be construed broadly to mean" one "or" one type "and not limited to" one "or" another; furthermore, the term "comprising" is to be interpreted as including both the singular and the plural, unless the context clearly dictates otherwise. Furthermore, the term "according to" should be understood as "at least partially according to … …", and the term "based on" should be understood as "based at least partially on … …", unless the context clearly indicates otherwise.

The embodiment of the application provides a rotating electrical machine. Fig. 1 is a schematic diagram of a rotating electrical machine according to an embodiment of the present application, showing some cases of a cross section of a rotating electrical machine 100. As shown in fig. 1, a rotary electric machine 100 includes:

a rotor 101 that rotates around a central axis OO';

a stator 102 having a stator core 1021, coils 1022, and coil end portions 431 protruding from the stator core 1021 in the coils 1022 toward both axial ends, which are located on the outer side in the radial direction of the rotor 101;

a cylindrical housing 103 surrounding the stator 102 from a radially outer side; and

a flow path 104 which is arranged in at least one of a peripheral wall portion of the casing 103 and an outer peripheral portion of the stator 102 and through which a refrigerant flows;

the flow path 104 includes: an inflow port 1041 and an outflow port 1042 located at both ends of the flow path 104 and communicating with the outside of the flow path 104; the temperature sensor 105 for measuring the temperature of the coil 1022 is located at the coil end 431 on the side of the outflow opening 1042.

Thus, in the present utility model, the temperature sensor for measuring the temperature of the coil is located at the coil end on the outflow port side; therefore, the coil temperature of the part with higher temperature can be measured in consideration of the setting position of the temperature sensor, so that the temperature of the stator can be properly measured, and the measurement accuracy of the temperature sensor is improved.

In some embodiments, the temperature sensor is a thermistor; the present application is not limited thereto, but may be other types of temperature sensors. For example, the temperature sensor may be a thermocouple, a platinum temperature measuring resistor, or the like.

In some embodiments, the flow path 104 has: the axial position of the spiral flow path portion is shifted in a circumferential direction around the central axis. Fig. 1 illustrates some cases of the spiral flow path portion, and fig. 2 is a schematic view of the spiral flow path portion according to an embodiment of the present application, and further illustrates some cases of the spiral flow path portion.

The rotary electric machine according to the embodiment of the present application will be described below by taking a spiral flow path portion as an example.

In the present embodiment, the direction in which the central axis OO' of the rotary electric machine 100 extends may be simply referred to as the "axial direction". As shown in fig. 1, the axial direction is, for example, one direction along the horizontal direction. The axial direction corresponds to the X-axis direction shown in the figure. One axial side is the +X side, and the other axial side is the-X side. The radial direction centered on the central axis OO 'may be simply referred to as a "radial direction", and the circumferential direction centered on the central axis OO' may be simply referred to as a "circumferential direction".

As shown in fig. 2, a predetermined direction in the circumferential direction is referred to as a circumferential direction one side θ1, and a direction opposite to the circumferential direction one side θ1 is referred to as a circumferential direction other side θ2. When a flow path described later is viewed from the other axial side (-X side) toward one axial side (+x side), the one circumferential side θ1 corresponds to a clockwise direction around the central axis, and the other circumferential side θ2 corresponds to a counterclockwise direction.

As shown in fig. 1 and 2, the rotary electric machine 100 includes: a rotor 101 centered on the central axis; a stator 102 located radially outward of the rotor 101; a housing 103; a plurality of bearings 15, 16; and a flow path 104. The rotary electric machine 100 of the embodiment of the present application is an inner rotor type motor. The rotor 101 rotates about a central axis with respect to the stator 102.

The housing 103 houses the rotor 101 and the stator 102. The housing 103 has a cylindrical shape surrounding the stator 102 from the radially outer side. The housing 103 forms part of the housing unit 80. The housing unit 80 has: a housing 103 and a gear housing that houses a transmission's speed reducer and differential. In addition, the housing 103 may also be referred to as a motor housing.

The housing 103 extends in the axial direction centering on the central axis. The housing 103 has a peripheral wall portion 1031 and a pair of side wall portions 1032. The peripheral wall 1031 is cylindrical with the central axis as the center, and extends in the axial direction. The pair of side wall portions 1032 are each plate-shaped. A pair of plates of each side wall 1032 face in the axial direction. One of the pair of side wall portions 1032 is connected to one axial end of the peripheral wall portion 1031. The other side wall portion of the pair of side wall portions 1032 is connected to the other end portion of the peripheral wall portion 1031 in the axial direction. One side wall portion holds the bearing 15 and the other side wall portion holds the bearing 16. The plurality of bearings are disposed at intervals in the axial direction.

The rotor 101 has a shaft 1011, a rotor core 1012, and a magnet 1013. The shaft 1011 extends in the axial direction about the central axis. The shaft 1011 has a cylindrical shape or a cylindrical shape. The shaft 1011 is supported rotatably about the central axis by a plurality of bearings 15 and 16. The bearings 15, 16 are, for example, ball bearings or roller bearings.

The rotor core 1012 has a cylindrical shape centered on the central axis and extends in the axial direction. The rotor core 1012 has an outer diameter greater than the outer diameter of the shaft 1011. The axial dimension of the rotor core 1012 is smaller than the axial dimension of the shaft 1011. The rotor core 1012 is disposed radially outward of the shaft 1011. The rotor core 1012 is disposed between both ends of the shaft 1011 in the axial direction. The inner peripheral surface of the rotor core 1012 is fixed to the outer peripheral surface of the shaft 1011 by press fitting, adhesion, or the like. That is, the rotor core 1012 is fixed to the outer peripheral surface of the shaft 1011. The rotor core 1012 is disposed between the pair of bearings 15 and 16 in the axial direction. The magnet 1013 is fixed to the outer peripheral portion of the rotor core 1012.

The stator 102 is opposed to the rotor 101 with a gap in the radial direction. The stator 102 surrounds the rotor 101 over the entire circumference in the circumferential direction from the radially outer side. The stator 102 has a stator core 1021, an insulator 1023, and a coil 1022. The stator core 1021 has a cylindrical shape centered on the central axis, and extends in the axial direction. The stator core 1021 surrounds the rotor 101 from the radially outer side. The stator core 1021 has, for example, a plurality of electromagnetic steel plates stacked in the axial direction. The outer peripheral surface of the stator core 1021 contacts the inner peripheral surface of the housing 103. The stator core 1021 and the housing 103 are fixed to each other by, for example, screw fixation or fitting.

The stator core 1021 has a core back and a plurality of pole teeth. The core back has a cylindrical shape centered on the central axis. The outer peripheral surface of the core back portion is in contact with the inner peripheral surface of the peripheral wall portion 1031. The pole teeth protrude radially inward from the inner peripheral surface of the core back. The pole teeth are plate-shaped, and a pair of plate surfaces face the circumferential direction. The plurality of pole teeth are arranged at intervals in the circumferential direction. The radially inner side surface of each tooth is opposed to the outer peripheral surface of the rotor 101 with a gap therebetween.

The insulator 1023 is mounted on the stator core 1021. The insulator 1023 is made of, for example, resin, and is made of an insulating material or the like. The insulator 1023 has a portion that covers at least a portion of each tooth. The coil 1022 is mounted on the stator core 1021 via an insulator 1023. The coils 1022 are arranged in a plurality in the circumferential direction. Each coil 1022 is mounted on each tooth via an insulator 1023.

As shown in fig. 1, each coil 1022 has a coil end 431 and a coil end 432 protruding from the stator core 1021 toward both ends in the axial direction. A temperature sensor 105, such as a thermistor, that measures the temperature of the coil 1022 is located at the coil end 431. The temperature sensor 105 measures the temperature of the coil 1022. The temperature sensor 105 is electrically connected to the inverter through a wire harness located within the housing. The temperature of the coil 1022 measured by the temperature sensor 105 is electrically transferred to the inverter.

In some embodiments, the temperature sensor 105 is a thermistor, for example, rod-shaped (elongated), for example, 1cm to 3cm in length, so that the thermistor can be fixed in the coil end 431. For example, the thermistor may be tied up with a rope or wire harness, or may be sandwiched between wires at the coil end 431; for another example, the thermistor may be held by a resin member. In addition, the thermistor may be welded to the coil end 431, for example, in the case of having a flat angle line.

In the embodiment of the present application, a refrigerant such as water flows inside the flow path 104. The flow passage 104 is disposed in at least one of the peripheral wall 1031 of the housing 103 and the outer periphery of the stator 102. As shown in fig. 1, the flow path 104 is arranged in the inner peripheral portion of the peripheral wall portion 1031.

As shown in fig. 1 and 2, the flow path 104 has a plurality of flow path portions; an inflow opening 27 communicating with the outside of the flow path 104; and an outflow opening 28 communicating with the outside of the flow path 104. In fig. 1, the flow path 104 is schematically shown, and a detailed illustration of the flow path portion is omitted. In addition, fig. 2 shows the internal space of the flow path 104 of the present embodiment as a three-dimensional shape. In the present embodiment, the inflow opening 27 and the outflow opening 28 extend radially outward from the flow path portion, respectively. One or more inflow openings 27 are provided in the flow path 104. One or more outflow openings 28 are provided in the flow path 104.

As shown in fig. 2, each of the plurality of flow path portions has a spiral shape whose axial position is shifted in the circumferential direction around the central axis. Specifically, each of the flow paths is a continuous spiral extending in the axial direction in the predetermined direction along with the predetermined direction in the circumferential direction. Although not particularly shown, in the present embodiment, the axial dimension of each flow path portion is larger than the radial dimension in a cross section along the central axis. The inner peripheral portion of each flow path portion is radially opposed to the core back portion of the stator 102 or is disposed inside the core back portion. In this embodiment, the inner peripheral portion of each flow path portion is disposed on the outer peripheral surface of the core back portion (see fig. 1).

As shown in fig. 2, the plurality of flow path portions include: a first flow path portion 21; and a second flow path portion 22 arranged in the axial direction with the first flow path portion 21. In the present embodiment, the first channel portion 21 and the second channel portion 22 extend in parallel in a double spiral shape. The flow path length of the first flow path portion 21 and the flow path length of the second flow path portion 22 are identical to each other.

The first channel portion 21 has a first inlet 21a and a first outlet 21b which are disposed at both ends of the spiral formed in the first channel portion 21 and communicate with the outside of the channel 104. The first flow path portion 21 has a spiral shape extending from the first inlet 21a toward the circumferential direction side θ1 toward the axial direction side (+x side). The second flow path portion 22 has a second inlet 22a and a second outlet 22b which are arranged at both ends of the spiral formed by the second flow path portion 22 and communicate with the outside of the flow path 50A. The second flow path portion 22 is in a spiral shape extending toward one axial side from the second inlet 22a toward one circumferential side θ1.

In the embodiment of the present application, the flow path 104 has a plurality of flow path portions, that is, at least the first flow path portion 21 and the second flow path portion 22, and the first flow path portion 21 and the second flow path portion 22 have an inflow port and an outflow port, respectively, which communicate with the outside of the flow path 104. For example, in the case of a single spiral flow path having only one inlet and one outlet each, the flow path length of the first flow path portion 21 and the second flow path portion 22 can be reduced according to the present embodiment, compared to the case of a single spiral flow path having the same overall length as the flow path 104 of the present embodiment, which is different from the present embodiment. Therefore, the pressure loss of the refrigerant flowing through each flow path portion can be appropriately reduced. The stator 102 can be cooled efficiently by the refrigerant flowing smoothly through the flow path 104.

As shown in fig. 2, in some embodiments, the first inflow port 21a and the second inflow port 22a are disposed at the same inflow opening 27. The inflow opening 27 is disposed at the other end (-X side) of the flow path 104. According to the present embodiment, the pressure loss of the refrigerant flowing in each flow path portion can be reduced, and the structure of the flow path 104 can be further simplified. In addition, the pipe connection portion connecting the flow path 104 and the external pipe can be suppressed to a small number. However, the present invention is not limited to this, and the first inlet 21a and the second inlet 22a may be disposed in different inflow openings 27.

In some embodiments, the first outlet 21b and the second outlet 22b are disposed in the same outlet opening 28. The outflow opening 28 is disposed at an end portion on one axial side (+x side) of the flow path 104. According to the present embodiment, the pressure loss of the refrigerant flowing in each flow path portion can be reduced, and the structure of the flow path 104 can be further simplified. In addition, the pipe connection portion connecting the flow path 104 and the external pipe can be suppressed to a small number. However, the present invention is not limited to this, and the first outlet 21b and the second outlet 22b may be disposed in different outlet openings 28.

In some embodiments, as shown in fig. 1 and 2, the inflow opening is open toward the gravitational upper side and the outflow opening is open toward the gravitational lower side. The temperature sensor is located inside the outflow port in the coil end in the circumferential direction.

As shown in fig. 1 and 2, the temperature sensor 105 is located at a coil end 431 on the side where the outflow opening 28 is located, among coil end 431 and 432 at both ends in the axial direction. The temperature sensor 105 measures the temperature of the coil 1022 on the outflow opening 28 side in the axial direction. Further, the temperature sensor 105 is located radially inward of the outflow opening 28 at a circumferential position of the coil end 431.

The above description has been made with respect to the case where the temperature sensor is provided at the coil end portion on the outflow port side, but the present application is not limited to this, and for example, the temperature sensor may be provided on the inflow port side as well; and the flow of the refrigerant can be controlled based on the comparison between the temperature detected by the temperature sensor on the outflow port side and the temperature detected by the temperature sensor on the inflow port side.

For example, when the temperature difference exceeds the threshold, indicating that the cooling effect is less than ideal, the output of the pump may be increased to increase the flow rate of the refrigerant; when the temperature difference is lower than the threshold value, the cooling effect is ideal, and the output of the pump can be reduced to slow down the flow speed of the refrigerant.

For another example, in the case where the temperature difference exceeds the threshold value, indicating that the cooling effect is not ideal, the circulation path of the refrigerant may be switched so that the refrigerant passes through the heat exchanger; when the temperature difference is lower than the threshold value, the cooling effect is ideal, and the circulation path of the refrigerant can be switched so that the refrigerant does not need to pass through the heat exchanger.

Thus, the cooling control can be performed more accurately.

As shown in fig. 1, the inverter unit 90 is fixed to the housing unit 80. In some embodiments, the inverter unit 90 is fixed with the housing 103. The inverter unit 90 includes an inverter case 91 and an inverter, not shown, housed in the inverter case 91. The inverter is electrically connected to each coil 1022 of the stator 102. The inverter supplies electric power to rotating electrical machine 100. Fig. 1 shows a case where the inverter unit 90 is separated from the housing unit 80, but the present application is not limited thereto, and for example, the inverter unit 90 and the housing unit 80 may be integrally provided.

In some embodiments, the temperature sensor on the inflow port side is located in the inverter unit 90. However, the present invention is not limited to this, and may be provided at other positions on the inflow port side.

In some embodiments, a refrigerant supply path for delivering refrigerant from a radiator, not shown, to the flow path 104 passes through the interior of the inverter unit 90. The refrigerant flowing through the refrigerant supply path cools the inverter of the inverter unit 90, and then flows into the flow path 104 through the inflow opening 27.

In the embodiment of the present application, the temperature of the refrigerant flowing in from the first inlet 21a is the lowest in the first flow path portion 21, and the temperature of the refrigerant flowing out from the first outlet 21b is the highest by heat exchange with the stator 102. In the second flow path 22, the temperature of the refrigerant flowing in from the second inlet 22a is the lowest, and the temperature of the refrigerant flowing out from the second outlet 22b is the highest by heat exchange with the stator 102.

Therefore, the temperature of the refrigerant flowing through the first flow path portion 21 and the temperature of the refrigerant flowing through the second flow path portion 22 are different in the axial direction between the inflow opening 27 side and the outflow opening 28 side, and are high in the outflow opening 28 side. The temperature of the refrigerant in the circumferential direction inside the outflow opening 28 is the highest temperature.

In the embodiment of the present application, the temperature sensor 105 is located at the coil end 431 on the side where the opening 28 flows out in the axial direction. Further, the temperature sensor 105 is located radially inward of the outflow opening 28 of the coil end 431 in the circumferential direction. The temperature of the coil 1022 at the highest position of the refrigerant temperature is measured, that is, the temperature of the coil 1022 at the highest position of the temperature in the stator 102 may be measured.

In some embodiments, as described above, in addition to the temperature sensor provided radially inward of the outflow opening 28, a temperature sensor may be provided radially inward of the inflow opening 27, and the flow of the refrigerant may be controlled based on the difference in the temperatures detected by the two. Thus, the cooling control can be performed more accurately.

The spiral flow path portion is described above as an example, and the case of the serpentine flow path portion will be described below.

Fig. 3 is another schematic view of a rotating electrical machine according to an embodiment of the present application. As shown in fig. 3, the rotary electric machine 200 is a part that drives the driving device 10. The driving device 10 includes a rotating electric machine 200, an inverter unit 800, and a bus bar 900. The inverter unit 800 controls the rotary electric machine 200. The bus bar 900 connects the rotating electrical machine 200 and the inverter unit 800. The drive device 10 may also have a transmission mechanism for transmitting the power of the rotary electric machine 200 to the axle of the vehicle.

As shown in fig. 3, the rotary electric machine 200 includes a rotor 201, a stator 202, a motor housing 203, and bearings 71 and 73. The rotor 201 is rotatable about a central axis extending in the axial direction. The stator 202 surrounds the rotor 201 from the radially outer side. A motor chamber is provided inside the motor housing 203. The motor housing 203 houses the rotor 201 and the stator 202 in a motor chamber. The bearings 71, 73 are held on the motor housing 203 and rotatably support the rotor 201. The bearings 71, 73 are, for example, ball bearings.

Rotor 201 has a shaft 2011 and a rotor body 2012. The shaft 2011 is rotatable about a central axis. The shaft 2011 extends in the axial direction about the central axis. Shaft 2011 is received within the motor chamber and secured to rotor body 2012. The shaft 2011 is rotatably supported by bearings 71, 73. The rotor body 2012 is fixed to an outer peripheral surface of the shaft 2011. More specifically, rotor body 2012 is fixed to the outer peripheral surface of shaft 2011. Although not shown, the rotor body 2012 includes a rotor core and a rotor magnet fixed to the rotor core.

The stator 202 is fixed inside the motor housing 203. Stator 202 has a stator core 2021 and a coil assembly. The stator core 2021 has a ring shape surrounding the rotor 201. The coil assembly has a plurality of coils 2022 mounted to the stator core 2021 in the circumferential direction. The plurality of coils 2022 are mounted to the stator core 2021 via an insulator, not shown.

As shown in fig. 3, the plurality of coils 2022 have coil end portions 421 and 422 protruding axially from the stator core 2021. A temperature sensor 205, such as a thermistor, that measures the temperature of the coil 2022 is located at the coil end 421. The temperature sensor 205 measures the temperature of the coil 2022. The temperature sensor 205 is electrically connected to the inverter unit 800 through a wire harness located in the motor housing. The measured temperature of the coil 2022 is electrically transferred to the inverter unit 800.

In some embodiments, the temperature sensor 205 is a thermistor, for example, rod-shaped (elongated), for example, 1cm to 3cm in length, so that the thermistor can be fixed in the coil end 421. For example, the thermistor may be tied up with a string or wire harness, or may be sandwiched between wires at the coil end 421; for another example, the thermistor may be held by a resin member. In addition, the thermistor may be welded to the coil end 421, for example, in the case of having a flat angle line.

The motor housing 203 has a first housing member 11, a second housing member 12, and a third housing member 13. The first housing part 11 encloses the stator 102 and the rotor 101 from the radially outer side. The second housing member 12 is located on the other side (-Y side) in the axial direction of the first housing member 11 and is fixed to the first housing member 11. The second housing member 12 is located on one axial side (+y side) of the third housing member 13 and is fixed to the first housing member 11. Although not shown, the space between the first housing member 11 and the second housing member 12 in the axial direction and the space between the first housing member 11 and the third housing member 13 in the axial direction are sealed by a sealing member. The sealing member is, for example, a metal gasket, a liquid gasket, or the like.

The first housing member 11 is a cylindrical member that surrounds the rotary electric machine 200 on the radial outside of the rotary electric machine 200. In some embodiments, the inner peripheral surface of the first housing member 11 is cylindrical with the central axis as a center. The first housing member 11 is open at the other side (-Y side) in the axial direction. The stator core 2021 is fitted inside the first housing member 11. The first housing member 11 has a cylindrical peripheral wall portion extending in the axial direction.

The second housing part 12 closes the opening on the other axial side of the first housing part 11. The second housing member 12 has a cover portion extending along a plane orthogonal to the central axis and a bearing holding portion provided to the cover portion. The bearing holding portion holds the bearing 71.

The third housing member 13 has an opposing wall portion extending along a plane orthogonal to the central axis and a bearing holding portion provided in the opposing wall portion. The bearing holding portion holds the bearing 73.

The motor housing 203 has a refrigerant flow path 204 and a pair of flow ports. The refrigerant flow path 204 is a flow path through which the refrigerant W such as the water supply flows. The refrigerant is, for example, water. The pair of flow ports are located at both ends of the refrigerant flow path 204. One of the pair of flow paths is the inflow port 58 through which the refrigerant W flows into the refrigerant flow path 204, and the other is the outflow port 59 through which the refrigerant W flows out of the refrigerant flow path 204.

The refrigerant flow path 204 is provided in the peripheral wall portion of the first housing member 11. The refrigerant flow path 204 opens at both axial end portions of the peripheral wall portion. An opening on one axial side (+y side) of the refrigerant flow path 204 is closed by the second casing member 12. In addition, the opening on the other side (-Y side) in the axial direction of the refrigerant flow path 204 is closed by the third casing member 13.

The refrigerant W flowing through the refrigerant flow path 204 is cooled by a cooling device, not shown. The refrigerant W flowing through the refrigerant flow path 204 cools the motor housing 203, thereby indirectly cooling the stator 202 fixed to the motor housing 203.

In some embodiments, the refrigerant flow path 204 is disposed axially over the entire axial length of the stator 202. Therefore, the refrigerant W flowing through the refrigerant flow path 204 cools the motor housing 203 over the entire axial length. Thereby, the refrigerant flow path 204 can uniformly cool the stator 202 over the entire axial length.

In some embodiments, the flow path has: an axial flow path portion parallel to a circumferential direction around the central axis, and a serpentine flow path portion connecting the axial flow path portions. Fig. 3 illustrates some cases of the serpentine flow path portion, fig. 4 is a schematic diagram of the serpentine flow path portion of the embodiment of the present application, and fig. 5 is another schematic diagram of the serpentine flow path portion of the embodiment of the present application, further illustrating some cases of the serpentine flow path portion.

As shown in fig. 3, the refrigerant flow path 204 has a serpentine flow path 51 and a pair of end flow paths. The pair of end flow paths are disposed at the ends of the serpentine flow path 51, respectively. The pair of end channels connects the ends of the serpentine channel 51 to the channel ports. As shown in fig. 4, the refrigerant flow path 204 surrounds the stator 202 from the radially outer side.

In the following description, when a pair of end flow paths are distinguished, they are referred to as a first end flow path 52 and a second end flow path 53, respectively. The first end flow path 52 is located on the upstream side with respect to the serpentine flow path 51, and the second end flow path 53 is located on the downstream side with respect to the serpentine flow path 51. Therefore, the first end flow path 52 connects the end of the serpentine flow path 51 with the inflow port 58. The second end flow path 53 connects an end of the serpentine flow path 51 to the outflow port 59.

The serpentine flow path 51 extends in a wave shape in the circumferential direction. The serpentine flow path 51 is provided over the entire axial length of the stator 202. Thereby, the refrigerant W flowing through the serpentine flow path 51 cools the entire axial length of the stator 202. In addition, the serpentine flow path 51 of the present embodiment is rectangular-wave-shaped. By forming the serpentine flow passage 51 in a rectangular wave shape, the water passage can be formed more closely than in the case where the serpentine flow passage 51 is in a sine wave shape, and the stator 202 can be cooled uniformly. In the present specification, the term "rectangular wave" includes not only a case where the waterway is curved in a strictly rectangular shape, but also a case where corners of the rectangle are curved with a predetermined curvature (i.e., a substantially rectangular wave).

The serpentine flow path 51 has a plurality of axial flow path portions 51a extending in the axial direction and a plurality of circumferential flow path portions 51b (serpentine flow path portions) extending in the circumferential direction. The plurality of axial flow path portions 51a extend parallel to each other. The plurality of axial flow path portions 51a extend at substantially equal intervals in the circumferential direction. The serpentine flow passage 51 of the present embodiment has five axial flow passage portions 51a. The circumferential flow path portions 51b connect the axial flow path portions 51a adjacent in the circumferential direction to each other. The serpentine flow path 51 of the present embodiment has four circumferential flow path portions 51b. Two of the four circumferential flow path portions 51b connect the ends of one side (+y side) of the adjacent axial flow path portions 51a in the axial direction with each other, and the other two connect the ends of the other side (-Y side) of the adjacent axial flow path portions 51a in the axial direction with each other.

The first end flow path 52 is arranged at the end of the other side (- θ side) of the serpentine flow path 51 in the circumferential direction. The first end flow path 52 has a first axial flow path portion 52a, a second axial flow path portion (axial flow path portion) 52c, a first circumferential flow path portion 52b, and a second circumferential flow path portion 52d. In the first end flow path 52, the refrigerant W flows in the order of the first axial flow path portion 52a, the first circumferential flow path portion 52b, the second axial flow path portion 52c, and the second circumferential flow path portion 52d.

The first axial flow path portion 52a and the second axial flow path portion 52c extend in parallel with each other in the axial direction. The first axial flow path portion 52a is disposed between the serpentine flow path 51 and the second axial flow path portion 52 c. An inflow port 58 is disposed in the path of the first axial flow path portion 52 a. The inflow port 58 of the present embodiment is disposed in the middle of the first axial flow path portion 52a, but the inflow port 58 may be provided at an upstream end of the first axial flow path portion 52 a.

The refrigerant W mainly flows from one axial side (+y side) to the other axial side (-Y side) in the first axial flow path portion 52 a. The refrigerant W flows from the other side (-Y side) in the axial direction toward one side (+y side) in the second axial flow path portion 52 c.

The first axial flow path portion 52a has a shorter flow path length than the second axial flow path portion 52 c. The axial positions of the other end portions (-Y side) of the first axial flow path portion 52a and the second axial flow path portion 52c coincide with each other. On the other hand, the end portion on one axial side (+y side) of the first axial flow path portion 52a is located on the other axial side (-Y side) than the end portion on one axial side (+y side) of the second axial flow path portion 52 c. In the motor housing 203, the second circumferential flow path portion 52d passes through a region on one axial side (+y side) of the first axial flow path portion 52 a. That is, the first axial flow path portion 52a and the second circumferential flow path portion 52d overlap in the axial direction.

The first and second circumferential flow path portions 52b and 52d extend in the circumferential direction. The first circumferential flow path portion 52b connects the ends of the first axial flow path portion 52a and the second axial flow path portion 52c on the other side (-Y side) in the axial direction. On the other hand, the second circumferential flow path portion 52d connects an end portion of the second axial flow path portion 52c on one axial side (+y side) to the end of the serpentine flow path 51.

The refrigerant W flows in the first and second circumferential flow path portions 52b and 52d toward circumferentially opposite sides. The refrigerant W flows from one side (+θ side) to the other side (- θ side) in the circumferential direction in the first circumferential flow path portion 52 b. The refrigerant W flows from the other side (- θ side) toward the one side (+θ side) in the second circumferential flow path portion 52 d.

The second circumferential flow path portion 52d overlaps with the first circumferential flow path portion 52b when viewed in the central axis direction. The first circumferential flow path portion 52b and the second circumferential flow path portion 52d are connected by the second axial flow path portion 52 c. Therefore, the first circumferential flow path portion 52b, the second circumferential flow path portion 52c, and the second circumferential flow path portion 52d are formed in a U-shape in the first end flow path 52. According to the present structure, the refrigerant W changes the flow direction from the other side (- θ side) to the one side (+θ side) in the circumferential direction in the first end flow path 52.

The second end flow path 53 is arranged at an end portion of the serpentine flow path 51 on one circumferential side (+θ side). The second end flow path 53 has a first axial flow path portion 53a, a second axial flow path portion (axial flow path portion) 53c, a first circumferential flow path portion 53b, and a second circumferential flow path portion 53d. In the second end flow path 53, the refrigerant W flows in the order of the second circumferential flow path portion 53d, the second axial flow path portion 53c, the first circumferential flow path portion 53b, and the first axial flow path portion 53 a.

The first axial flow path portion 53a and the second axial flow path portion 53c extend in parallel with each other in the axial direction. The first axial flow path portion 53a is disposed between the serpentine flow path 51 and the second axial flow path portion 53 c. More specifically, the first axial flow path portion 53a is disposed between the serpentine flow path 51 and the second axial flow path portion 53 c. The outflow port 59 is disposed in the path of the first axial flow path portion 53 a. The outflow port 59 of the present embodiment is arranged in the middle of the first axial flow path portion 53a, but the outflow port 59 may be provided at the downstream end of the first axial flow path portion 53 a.

The refrigerant W flows in the first axial flow path portion 53a and the second axial flow path portion 53c toward axially opposite sides. The refrigerant W mainly flows from one axial side (+y side) to the other axial side (-Y side) in the first axial flow path portion 53 a. The refrigerant W flows from the other side (-Y side) in the axial direction toward one side (+y side) in the second axial flow path portion 53 c.

The first axial flow path portion 53a has a shorter flow path length than the second axial flow path portion 53 c. The axial positions of the ends of the first axial flow path portion 53a and the second axial flow path portion 53c on one axial side (+y side) coincide with each other. On the other hand, the end of the first axial flow path portion 53a on the other side in the axial direction (-Y side) is located on one side in the axial direction (+y side) than the end of the second axial flow path portion 53c on the other side in the axial direction (-Y side). In the motor housing 203, the second circumferential flow path portion 53d passes through a region on the other side (-Y side) in the axial direction of the first axial flow path portion 53 a. That is, the first axial flow path portion 53a and the second circumferential flow path portion 53d overlap in the axial direction.

The first and second circumferential flow path portions 53b and 53d extend in the circumferential direction. The first circumferential flow path portion 53b connects the ends of the first axial flow path portion 53a and the second axial flow path portion 53c on one axial side (+y side) to each other. On the other hand, the second circumferential flow path portion 53d connects the end of the second axial flow path portion 53c on the other side in the axial direction (-Y side) with the end of the serpentine flow path 51.

The refrigerant W flows from one side (+θ side) to the other side (- θ side) in the circumferential direction in the first circumferential flow path portion 53 b. The refrigerant W flows from the other side (- θ side) toward the one side (+θ side) in the second circumferential flow path portion 53 d.

The second circumferential flow path portion 53d overlaps with the first circumferential flow path portion 53b when viewed in the central axis direction. The first circumferential flow path portion 53b and the second circumferential flow path portion 53d are connected by the second axial flow path portion 53 c. Therefore, the first circumferential flow path portion 53b, the second circumferential flow path portion 53c, and the second circumferential flow path portion 53d are folded back in a U-shape in the second end flow path 53. According to the present structure, the refrigerant W changes the flow direction from one side (+θ side) to the other side (- θ side) in the second end flow path 53.

In the present embodiment, five axial flow path portions are provided in the serpentine flow path 51, and two axial flow path portions are provided in the first end flow path 52 and the second end flow path 53, respectively. That is, 9 axial flow path portions are provided in the refrigerant flow path 50. All the axial flow path portions are arranged at equal intervals in the circumferential direction. Therefore, the refrigerant flow path 204 of the present embodiment can uniformly cool the stator 202 in the circumferential direction.

In some embodiments, the first end flow path 52 has a first circumferential flow path portion 52b, a second circumferential flow path portion 52c, and a second circumferential flow path portion 52d that are turned back in a U-shape in the circumferential direction around the flow inlet 58. Similarly, the second end flow path 53 has a first circumferential flow path portion 53b, a second axial flow path portion 53c, and a second circumferential flow path portion 53d that are turned back in a U shape in the circumferential direction around the flow outlet 59. Therefore, a flow path surrounding the flow path port (the inflow port 58 and the outflow port 59) is provided around the flow path port. According to the present embodiment, regardless of the arrangement of the flow passage ports, the surroundings of the flow passage ports can be cooled uniformly by the flow passage surrounding the flow passage ports. Therefore, according to the present embodiment, the degree of freedom in the arrangement of the flow passage ports can be ensured, and the stator 202 can be cooled uniformly around the flow passage ports.

In some embodiments, the second axial flow path portion 52c and the second axial flow path portion 53c are arranged between the circumferential directions of the pair of flow paths. According to the present embodiment, even when the pair of flow passage ports are separated in the circumferential direction, the refrigerant W can be caused to flow and cool in the region between the flow passage ports by the second axial flow passage portion 52c and the second axial flow passage portion 53c. As a result, the stator 202 can be cooled uniformly in the circumferential direction regardless of the arrangement of the flow ports.

In some embodiments, the pair of end flow paths are each configured in a U-shape that is turned back in the circumferential direction. That is, the pair of end flow paths of the present embodiment each have the first circumferential flow path portions 52b, 53b, the second circumferential flow path portions 52d, 53d, and the second axial flow path portions 52c, 53c. Accordingly, the flow paths surrounding the flow path ports are provided around the two flow path ports, respectively, and the degree of freedom in arrangement of the flow path ports is improved. Further, since the two second axial flow path portions 52c, 53c are arranged between the pair of flow path portions, the stator 202 can be cooled uniformly when the distance between the pair of flow path portions is large.

In some embodiments, the case where the first circumferential flow path portions 52b, 53b, the second circumferential flow path portions 52d, 53d, and the axial flow path portions 52c, 53c are provided in both end flow paths has been described, but the above-described fixed effects can be obtained if at least one of the end flow paths has these flow paths.

The inflow port 58 is arranged between the first circumferential flow path portion 52b and the second circumferential flow path portion 52d in the central axis direction. Similarly, in the central axis direction, the outflow port 59 is arranged between the first circumferential flow path portion 53b and the second circumferential flow path portion 53 d. According to the present embodiment, since the flow paths are provided on the both axial sides of the flow path port, the flow paths can be easily arranged without any gap around the flow path port, and the stator 202 can be cooled uniformly.

As shown in fig. 3 and 4, the inverter unit 800 has an inverter 81 and an inverter case 82 that houses the inverter 81. That is, the drive device 10 has an inverter 81 and an inverter case 82. The inverter 81 converts a direct current of a battery, not shown, into an alternating current. The inverter 81 is connected to the stator 202 via a bus bar 900. The ac current converted by the inverter 81 is supplied to the stator 202 via the bus bar 900. That is, the inverter 81 converts a direct current supplied from a battery into an alternating current and supplies the alternating current to the stator 202.

As shown in fig. 4, the inverter case 82 is disposed above the motor case 203. The inverter case 82 is disposed radially outward of the motor case 203 as viewed from the central axis direction. The inverter case 82 is fixed to a peripheral wall portion of the first case member 11.

The inverter case 82 has an inverter refrigerant flow path 85, an inverter inflow port 88, and an inverter outflow port 89. That is, the inverter case 82 is provided with an inverter refrigerant flow path 85, an inverter inflow port 88, and an inverter outflow port 89. The refrigerant W flows through the inverter refrigerant flow path 85. The refrigerant W passing through the inverter refrigerant flow path 85 flows in the vicinity of the inverter 81. Thereby, the refrigerant W cools the inverter 81.

The inverter inflow port 88 is located at an upstream end of the inverter refrigerant flow path 85. On the other hand, the inverter outflow port 89 is located at the downstream end of the inverter refrigerant flow path 85. The inverter outflow port 89 is connected to the inflow port 58 of the refrigerant flow path 204. The refrigerant W flows into the inverter refrigerant flow path 85 from the inverter inlet 88, flows into the refrigerant flow path 204 through the inverter outlet 89 and the inlet 58, and flows out of the outlet 59. Thus, the refrigerant W sequentially cools the inverter 81 and the stator 202.

According to some embodiments of the present application, one of the pair of flow ports (specifically, the inflow port 58) is connected to an inverter refrigerant flow path 85 provided to the inverter case 82. The inverter refrigerant flow path 85 and the refrigerant flow path 204 are directly connected without piping or the like. According to the present embodiment, the number of components constituting rotary electric machine 200 can be reduced as compared with the case where a pipe is provided between inverter refrigerant flow path 85 and refrigerant flow path 204. Further, according to the present embodiment, the entire flow path through which the refrigerant W flows can be made short, and the line resistance of the entire flow path of the refrigerant W can be reduced.

According to some embodiments of the present application, the refrigerant flow path 204 is arranged on the downstream side of the inverter refrigerant flow path 85. Therefore, the refrigerant W cools the stator 202 after cooling the inverter 81. In general, the inverter 81 is more likely to generate heat rapidly than the stator 202. According to the present embodiment, the inverter 81 can be cooled by the low-temperature refrigerant W cooled by the cooling device (not shown), and a rapid temperature rise of the inverter 81 can be suppressed.

In some embodiments, one of the pair of flow ports (specifically, the flow inlet 58) radially overlaps with the inverter case 82. According to the present embodiment, the distance between the inflow port 58 and the inverter refrigerant flow path 85 can be shortened, and the refrigerant flow path 204 and the inverter refrigerant flow path 85 can be connected at the shortest distance.

In some embodiments, the temperature sensor is located circumferentially inside the axial flow path portion provided with the outflow port. In some embodiments, the temperature sensor is located axially at the coil end near the outflow opening.

As shown in fig. 3 to 5, the temperature sensor 205 is located near the coil end 421 of the outflow port 59 in the circumferential direction. Specifically, the temperature sensor 205 is located at the coil end 421 radially inward of the distal flow path 53 where the outflow port 59 is located. In the refrigerant flow path 204, the temperature of the refrigerant flowing in from the inlet 58 is the lowest, and the temperature of the refrigerant flowing out from the outlet 59 is the highest by heat exchange with the stator 202.

Therefore, at each portion in the circumferential direction, the temperature of the refrigerant flowing through the end flow path 52 is different from the temperature of the refrigerant flowing through the end flow path 53. Therefore, the temperature of the stator 202 differs at each position in the circumferential direction, and the temperature of the stator 202 inside the distal flow path 53 becomes the highest temperature at the circumferential position. By positioning the temperature sensor 205 at the coil end 421 inside the distal flow path 53, the temperature of the coil 2022 at the position where the temperature of the stator 202 is maximum can be measured.

On the other hand, the other flow path port (specifically, the outflow port 59) of the pair of flow path ports is arranged so as to be offset from the inverter case 82 in the circumferential direction. A pipe connected to a cooling device (not shown) or the like for the refrigerant W is connected to the outflow port 59. According to the present embodiment, the outflow port 59 and the inverter case 82 are arranged so as to be offset in the circumferential direction, and therefore, the pipe connected to the outflow port 59 can be prevented from interfering with the inverter case 82.

In addition, as the piping connected to the outflow port 59, piping resistance of the entire flow path can be suppressed as compared with the case where a piping bent widely is used to avoid interference with the inverter case 82, or the like. Further, according to the present embodiment, the degree of freedom in the structure of the piping connected to the flow path port is increased, and the degree of freedom in the design of the path for circulating the refrigerant W can be increased.

In some embodiments, bus bar 900 electrically connects stator 202 with inverter unit 800. In the present embodiment, three bus bars 900 are provided in the driving device 10 corresponding to the coils of the U-phase, V-phase, and W-phase of the stator 202. The bus bar 900 extends in the up-down direction. The bus bar 900 is made of a metal material having low resistivity such as a copper alloy. The bus bar 900 is plate-shaped along a plane orthogonal to the central axis.

In some embodiments, in which the temperature of the refrigerant flowing in the end flow path 52 and the temperature of the refrigerant flowing in the end flow path 53 are different in each part in the circumferential direction, the cooling effect of the stator 202 is different in each position in the circumferential direction, and the coil position at the position where the temperature of the stator 202 is maximum can be measured. This can improve the safety of the motor.

The embodiment of the application also provides a driving device, which comprises the rotating motor in the embodiment. Since the structure of the rotary electric machine has been described in detail in the above embodiments, the contents thereof are incorporated herein, and the description thereof is omitted.

For example, a rotating electrical machine forms part of the drive device. Although not particularly shown, the drive device is mounted on the vehicle to rotate the axle. The vehicle equipped with the drive device is a vehicle using a motor as a power source, such as a Hybrid Electric Vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an Electric Vehicle (EV). The driving device includes a rotary electric machine, a transmission device not shown, a casing unit not shown in part, and an inverter unit. The transmission device is connected to the rotating electrical machine, and transmits rotation of a rotor of the rotating electrical machine to an axle of the vehicle. The transmission device comprises: a speed reduction device connected to the rotating electrical machine; and a differential device connected to the speed reducing device.

While the utility model has been described in connection with specific embodiments, it will be apparent to those skilled in the art that the description is intended to be illustrative and not limiting in scope. Various modifications and alterations of this utility model will occur to those skilled in the art in light of the spirit and principles of this utility model, and such modifications and alterations are also within the scope of this utility model.

Claims (14)

1. A rotating electrical machine, characterized in that the rotating electrical machine comprises:

a rotor that rotates around a central axis;

a stator having a stator core located radially outward of the rotor, a coil, and coil ends protruding from the stator core of the coils toward both axial ends;

a cylindrical housing that surrounds the stator from a radially outer side; and

a flow path which is arranged on at least one of a peripheral wall portion of the casing and an outer peripheral portion of the stator and through which a refrigerant flows;

the flow path has: an inflow port communicating with the outside of the flow path and through which the refrigerant flows into the flow path, and an outflow port through which the refrigerant flows out of the flow path; wherein a temperature sensor for measuring the temperature of the coil is located at the coil end on the outflow port side.

2. The rotating electric machine according to claim 1, characterized in that the temperature sensor is a thermistor.

3. The rotary electric machine according to claim 2, wherein the thermistor is fixed to the coil end by a rope or a wire harness, or the thermistor is sandwiched between wires of the coil end, or the thermistor is held to the coil end by a resin member, or the thermistor is welded to the coil end.

4. The rotating electrical machine according to claim 1, characterized in that an inverter unit is provided on the housing, the temperature sensor being electrically connected to the inverter unit.

5. The rotary electric machine according to claim 4, wherein a temperature sensor is further provided on one side of the inflow port; the flow of the refrigerant in the flow path is controlled based on a difference between a temperature detected by a temperature sensor provided on the outflow port side and a temperature detected by a temperature sensor provided on the inflow port side.

6. The rotary electric machine according to claim 5, wherein the temperature sensor on the inflow port side is located in the inverter unit.

7. The rotating electrical machine according to any one of claims 1 to 6, wherein the flow path has: the axial position of the spiral flow path portion is shifted in a circumferential direction around the central axis.

8. The rotary electric machine according to claim 7, wherein the temperature sensor is located inside the outflow port in the coil end in a circumferential direction.

9. The rotary electric machine according to claim 7, wherein the inflow port opens toward an upper side in a gravitational direction, and the outflow port opens toward a lower side in the gravitational direction.

10. The rotating electrical machine according to any one of claims 1 to 6, wherein the flow path has: an axial flow path portion parallel to a circumferential direction around the central axis and a serpentine flow path portion connecting the axial flow path portions.

11. The rotating electrical machine according to claim 10, wherein the temperature sensor is located inside the axial flow path portion provided with the outflow port in a circumferential direction.

12. The rotating electrical machine according to claim 10, wherein the temperature sensor is located at the coil end portion near the outflow port in the axial direction.

13. The rotating electrical machine according to any one of claims 1 to 6, wherein the temperature sensor is rod-shaped and has a length of 1 cm to 3 cm.

14. A drive device, characterized in that the drive device comprises a rotating electrical machine according to any one of claims 1 to 13.