Water-cooled inverter integrated drive motor

Abstract

The present invention relates to an inverter-integrated drive motor suitable for use as a drive motor for electric two-wheeled vehicles, and in particular, a water-cooled inverter-integrated drive motor is disclosed in which a cooling path is formed that passes through all of the heat-generating parts, such as the stator, rotor, and inverter, so as to cool all of them, which generate a lot of heat. A water-cooled inverter-integrated drive motor according to one embodiment of the present invention comprises a motor unit having a rotor that rotates axially around a rotational axis and a stator surrounding the rotor, and an inverter unit having a switching element. A drive shaft having a rotor cooling channel formed inside is coupled to the center of the rotor, and a cylindrical frame having one end closed as an upper surface and having a stator cooling channel formed on a side portion surrounding the stator is coupled to the upper portion of the drive shaft. An inverter cooling channel for cooling the inverter unit is formed on the upper surface of the upper portion of the cylindrical frame, and a cooling liquid introduced from one side of the cylindrical frame passes through the stator cooling channel formed on the side portion of the cylindrical frame, the inverter unit cooling channel formed on the upper surface of the cylindrical frame, and the rotor cooling channel of the drive shaft, thereby cooling the stator, rotor, and inverter unit.

Description

Technology Field

[0001] The present invention relates particularly to an inverter-integrated drive motor suitable as a drive motor for electric two-wheeled vehicles, and more specifically to a water-cooled inverter-integrated drive motor in which a cooling path is formed that passes through all of the heat-generating parts, such as the stator, rotor, and inverter, so as to cool all of them, which generate a lot of heat. Background Technology

[0003] Recently, interest in e-mobility, which refers to all forms of transportation that move using electric energy, has been increasing. In a broad sense, e-mobility refers to various forms of transportation such as vehicles, ships, and aircraft that use electric propulsion, while in a narrow sense, it refers to personal mobility devices for one or two people that use electricity as power and can be utilized for daily life, transportation, logistics, and delivery purposes.

[0004] And one of the key components of e-mobility is the electric motor that provides the propulsion power.

[0005] Electric motors convert electrical energy into mechanical energy to move means of transportation; the development of e-mobility is closely linked to the advancement of electric motor technology, and efficient and powerful electric motors determine the performance of e-mobility.

[0006] Meanwhile, power converters or control devices such as inverters are required to drive and control electric motors; however, conventional drive motors for e-mobility often had the motor and inverter placed separately due to issues such as heat generation.

[0007] However, recently, many technologies have been developed to integrate these inverters and control units into electric motors to reduce system size and weight and improve installation convenience, and many technologies applying water-cooled structures to resolve heat generation issues are also being introduced.

[0008] In addition, conventionally, the motor body and the inverter were integrated using a heat sink, and the inverter device was cooled by flowing a cooling liquid inside the heat sink, after which the cooling liquid was supplied to the motor body to cool the motor body.

[0009] As a representative prior art patent, Japanese Registered Patent No. 5859031 discloses a technology capable of suppressing an increase in pressure loss and improving cooling capacity at the interconnection part between the inverter device-side refrigerant path and the motor-side refrigerant path, or at the connection part with an external refrigerant path.

[0010] The motor-side refrigerant flow path (18) of the above patent is formed by inserting an inner frame (5) with a flow path groove (9) formed on its outer surface into a cylindrical outer frame (13) constituting the motor frame (2), and the inverter-side refrigerant flow path (19) is formed by providing a flow path groove (23) in the end frame (20) on the half-load side (opposite side of the load side) of the motor.

[0011] Then, a power module (51) is attached to the upper surface of the above-mentioned half-load side end frame (20), a power module driving circuit board (52) is placed on the upper surface of the power module (51), and a capacitor (54) is placed in the center of the half-load side end frame (20).

[0012] The technology of the above patent is a technology that can cool the stator (40) in which the stator coil (44) is arranged, and the inverter device (50) equipped with the power module (51) and capacitor (54), but cannot cool the rotor (rotor, 53), which is another important component of the motor that generates heat.

[0013] As shown in FIG. 1, a permanent magnet (37) is coupled to the rotor (rotor, 53). Since a demagnetization phenomenon occurs in which the magnetic force decreases as the temperature of the magnet rises, and thus the performance of the motor deteriorates, cooling of the rotor is also important, but the prior art patent does not disclose any configuration for a technology to cool the rotor.

[0014] Therefore, it is necessary to develop technology that can also cool the rotor in water-cooled inverter-integrated drive motors. Prior art literature

[0016] Japanese Patent Publication No. 5859031 (Date of publication Dec. 25, 2015) The problem to be solved

[0017] The technical problem that the present invention aims to solve relates to an inverter-integrated drive motor, and in particular, to provide a water-cooled inverter-integrated drive motor in which a cooling path is formed that passes through all of the heat-generating parts—such as the stator, rotor, and inverter—so that all of these heat-generating parts can be cooled. means of solving the problem

[0019] According to one aspect of the present invention as a means of solving the problem,

[0020] It includes a motor unit having a rotor that rotates axially around a rotation axis and a stator surrounding the rotor, and an inverter unit having a switching element.

[0021] A drive shaft having a rotor cooling channel formed therein is coupled to the center of the rotor, and a cylindrical frame with one end closed as the upper surface is coupled to the upper part of the drive shaft, having a stator cooling channel formed on the side portion surrounding the stator, and an inverter cooling channel for cooling the inverter unit is formed on the upper surface of the upper portion of the cylindrical frame, so that a cooling liquid introduced from one side of the cylindrical frame passes through the stator cooling channel formed on the side portion of the cylindrical frame, the inverter unit cooling channel formed on the upper surface of the cylindrical frame, and the rotor cooling channel of the drive shaft, thereby providing a water-cooled inverter integrated drive motor that cools the stator, rotor, and inverter unit.

[0022] Here, the drive shaft may have a closed lower side that transmits driving force to the outside, and an open hollow upper side.

[0023] In addition, a column portion is formed protruding from the bottom surface in the direction of the rotation axis at the center of the upper surface of the cylindrical frame, so that the column portion can be inserted into the hollow portion of the drive shaft.

[0024] In addition, a drive shaft receiving portion is formed on the bottom surface of the upper portion of the cylindrical frame, with a ring shape centered on the rotation axis extending in the direction of the rotation axis and protruding, so that the drive shaft can be coupled to the drive shaft receiving portion.

[0026] In addition, a bearing may be inserted between the drive shaft receiving portion and the drive shaft, and an oil seal may be inserted between the bearing and the drive shaft receiving portion.

[0028] According to another aspect of the present invention as a means of solving the problem, an inlet for introducing a cooling liquid and an outlet for discharging a cooling liquid are formed on the side of the cylindrical frame of the present invention, and an inverter cooling channel may be formed in a left-right symmetrical shape on the upper surface of the cylindrical frame with respect to the centerline of the inlet and the outlet.

[0029] And the inverter cooling channel on the upper surface of the cylindrical frame is in communication with the stator cooling channel formed on the side of the cylindrical frame, and the position of communication may be a position symmetrical with respect to the inlet and the outlet with respect to a reference line placed on the plane of the upper surface that is orthogonal to the center line.

[0030] In addition, at a position corresponding to the rotor cooling channel on the upper surface of the cylindrical frame, an inlet-side through hole and an outlet-side through hole may be formed symmetrically with respect to the centerline so that the rotor cooling channel and the inverter cooling channel are in communication.

[0031] Meanwhile, a barrier wall protruding radially may be formed on one side of the outer surface of the above-mentioned column portion, and the barrier wall may be formed vertically from the bottom to the top of the column portion.

[0033] According to another aspect of the present invention as a means of solving the problem, a hollow portion may be formed inside the column portion of the cylindrical frame of the present invention, wherein a vertical partition may be formed in the hollow portion of the column portion of the cylindrical frame, and a horizontally connected flow path may be formed at the lower end of the partition of the column portion of the cylindrical frame.

[0035] In addition, a flow path cover is placed over the upper surface of the cylindrical frame, and the inverter unit may be mounted on the upper surface of the flow path cover. At this time, the lower surface of a switching element constituting the inverter unit may be in contact with the upper surface of the flow path cover.

[0036] In addition, a cooling channel may be formed on the bottom surface of the above-mentioned Euro cover in a shape corresponding to the cooling channel formed on the upper surface of the above-mentioned cylindrical frame.

[0037] In addition, a sealant may be applied to the area where the upper surface and the lower surface of the above-mentioned cylindrical frame and the lower surface of the above-mentioned flow cover meet.

[0038] In addition, the inverter unit has a switching element disposed on a circular substrate, a connector is attached to the upper surface of the substrate, and an inverter cover is placed over the upper part of the inverter unit with a through hole provided so that the connector can protrude, and the inverter cover can be combined with the cylindrical frame. Effects of the invention

[0040] According to an embodiment of the present invention, in an inverter-integrated drive motor in which an inverter and a drive motor are integrated, the cooling path is configured to pass through the stator, rotor, and inverter of the motor, thereby resolving the problem of heat generation in the motor and inverter resulting from the integration.

[0041] In particular, conventionally, the rotor could not be cooled, and the problem of degrading the performance of the drive motor occurred due to magnetization caused by heat generated in the rotor. However, according to an embodiment of the present invention, the heat generated in the rotor can be easily dissipated, so the problem of magnetization caused by heat generation in the rotor does not occur, thereby resolving the problem of performance degradation of the drive motor.

[0042] In addition, it prevents situations where drive motor or inverter components deteriorate and fail due to high temperatures.

[0043] In addition, since the inverter is integrated with the drive motor, the space previously occupied by the inverter can be utilized for other purposes, and the reduced electrical connection distance between the inverter and the drive motor increases system efficiency. Brief explanation of the drawing

[0045] Figure 1 is a configuration diagram of a conventional inverter-integrated drive motor. FIG. 2 is a perspective view of the assembled state of a water-cooled inverter-integrated drive motor according to an embodiment of the present invention. FIG. 3 is an exploded perspective view of a water-cooled inverter-integrated drive motor according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of a water-cooled inverter-integrated drive motor according to an embodiment of the present invention. FIG. 5 is a perspective view of a cylindrical frame according to an embodiment of the present invention, viewed from above and from below. FIG. 6 is a perspective view from above and a perspective view from below of a cooling channel formed in a cylindrical frame according to an embodiment of the present invention. FIG. 7 is a top-view perspective of only the cooling channel formed in a cylindrical frame according to an embodiment of the present invention. FIG. 8 is a front view showing the cross-sectional position of a water-cooled inverter-integrated drive motor according to an embodiment of the present invention. Figure 9 is a cross-sectional view taken from the cross-sectional position of Figure 8. FIG. 10 is a plan view and a cross-sectional view of a cylindrical frame according to an embodiment of the present invention. FIG. 11 is a front view and a cross-sectional view of a drive shaft according to an embodiment of the present invention. FIG. 12 is a cross-sectional view of the combination of a cylindrical frame and a drive shaft according to an embodiment of the present invention. FIG. 13 is a cross-sectional view showing the combination of a cylindrical frame, a drive shaft, and a flow path cover according to an embodiment of the present invention. FIG. 14 is a perspective view showing the combined state of a cylindrical frame, a drive shaft, and a flow path cover according to an embodiment of the present invention. FIG. 15 is a bottom perspective view showing the combined state of a cylindrical frame and a Euro cover according to an embodiment of the present invention, and a plan view showing the sealant application area. Specific details for implementing the invention

[0046] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0047] In describing the present invention, the terms used in the specification below are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0048] Furthermore, terms such as “comprising” or “having” in this specification are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0049] In describing the invention with reference to the attached drawings, identical components are assigned the same reference numerals, and redundant descriptions of identical components are omitted. Furthermore, in describing the invention, if it is determined that a detailed description of related prior art could unnecessarily obscure the essence of the invention, such detailed description is omitted.

[0050] This is a perspective view of the assembled state of a water-cooled inverter-integrated drive motor according to an embodiment of the present invention. FIG. 3 is an exploded perspective view of a water-cooled inverter-integrated drive motor according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of a water-cooled inverter-integrated drive motor according to an embodiment of the present invention.

[0052] FIG. 2 is a perspective view of the assembled state of a water-cooled inverter integrated drive motor according to one embodiment of the present invention, FIG. 3 is an exploded perspective view, FIG. 4 is a cross-sectional view taken from the AA direction shown in FIG. 2, and FIG. 5 is a perspective view taken from above and a perspective view taken from below of a cylindrical frame, which is one component of the water-cooled inverter integrated drive motor of the present invention.

[0054] Referring to FIGS. 2 to 5, the water-cooled inverter-integrated drive motor of the present invention comprises a motor part (100) having a rotor (110) that rotates axially around a rotational axis (zz) and a stator (120) that surrounds the rotor, and an inverter part (200) having a switching element (210). A drive shaft (150) having a rotor cooling channel formed inside is coupled to the center of the rotor (110), and a cylindrical frame (300) having a shape with one side blocked by an upper surface (310) and a stator cooling channel formed in a side part (320) that surrounds the stator (120) is coupled to the upper part of the drive shaft (150).

[0055] And, on the upper surface of the upper part (310) of the cylindrical frame (300), an inverter cooling channel (311, 319) for cooling the inverter part (200) is formed, and a cooling liquid introduced from one side of the cylindrical frame (300) passes through the stator cooling channel (325, 326) formed on the side part (320) of the cylindrical frame, the inverter part cooling channel (311, 319) formed on the upper part (310) of the cylindrical frame (300), and the rotor cooling channel of the drive shaft, thereby cooling the stator (120), the rotor (110), and the inverter part (200).

[0056] Here, a permanent magnet is coupled to the rotor (110), and the stator (120) may have a structure in which a coil is wound.

[0058] As shown in FIGS. 3 and 4, the motor unit (100), consisting of a rotor (110), a stator (120) surrounding the rotor, and a drive shaft (150) located at the center of the rotor (110), is inserted into the open lower part of the cylindrical frame (300), and the drive shaft (150) can be freely rotatably coupled to the upper surface (310) of the cylindrical frame (300).

[0059] To this end, a bearing (140) is inserted between the upper part of the drive shaft and the lower part of the upper surface (310) of the cylindrical frame (300), and an oil seal (130) is installed on the upper part of the bearing (140) to surround the upper outer surface of the drive shaft (150) so as to prevent leakage of the coolant. In addition, a stepped portion (157) is formed along the outer surface of the drive shaft (150) at the part where the drive shaft (150) is coupled with the bearing (140) so as to support the drive shaft (150), and a keyway (158) is formed at the lower part of the drive shaft (150) so as to allow coupling of a gear or pulley on the load side, and a key (159) can be installed.

[0060] And with the motor part (100) inserted into the open lower part of the cylindrical frame (300), a motor cover (500) is connected to the lower part of the cylindrical frame (300) by a bolt (501), so that the motor part (100) is shielded from the outside.

[0061] At this time, the lower part of the drive shaft (150) is freely rotatably coupled to the motor cover (500), and a bearing (160) and an oil seal (170) are installed as in the upper part, and an O-ring (510) may be fitted to the part where the upper circumference of the motor cover (500) contacts the lower surface of the cylindrical frame (300) to ensure airtightness inside the housing where the motor part (100) is located.

[0063] Meanwhile, an inverter cooling channel (311, 319) is formed on the upper surface (310) of the cylindrical frame (300), and as shown in FIG. 5, it can be processed into the shape of a groove formed to a certain depth from the uppermost surface of the upper surface (310).

[0064] And a Euro cover (350) is placed over the upper surface (310) of the cylindrical frame (300), and a cooling channel may be formed in the lower surface of the Euro cover (350) by a groove machined to a certain depth in a shape corresponding to the inverter cooling channel (311, 319) formed on the upper surface of the cylindrical frame, and the Euro cover (350) may be bolted to the upper surface of the cylindrical frame (300).

[0065] Additionally, an inverter unit (200) may be mounted on the upper surface of the Euro cover (350), and more specifically, the lower surface of a switching element (220) constituting the inverter unit (200) may be in contact, and a heat sink (230) may be inserted as needed.

[0066] In addition, the inverter unit (200) may be composed of a circular substrate (210) that fits the shape of the Euro cover (350), a switching element (220) mounted on the substrate, and a connector (290).

[0067] In addition, an inverter cover (400) is provided on the upper part of the inverter part so that the connector (290) can protrude outwardly, so that the inverter part (200) can be shielded from the outside, and the inverter cover (400) can be joined to the cylindrical frame (300) or the flow path cover (350) by a plurality of bolts.

[0069] The stator cooling channels (325, 326), inverter cooling channels (311, 319), and rotor cooling channels described above can be explained more specifically through the perspective view of the cylindrical frame (300) formed in the cylindrical frame according to the embodiment of the present invention in FIG. 6, the perspective view of the cylindrical frame (300) viewed from the top and bottom, and the perspective view of only the cooling channels formed by the cylindrical frame according to the embodiment of the present invention in FIG. 7, viewed from the top.

[0071] FIG. 6 is a drawing showing the cylindrical frame (300) of the present invention in a translucent manner and the cooling channel formed in the cylindrical frame, where FIG. 6 (a) shows the view from the upper side and FIG. 6 (b) shows the view from the lower side.

[0072] As shown in the drawing, a cooling liquid inlet / outlet port (306) may be formed on the upper side of the cylindrical frame (300), and an inlet port (I) may be formed on one side and an outlet port (O) on the other side.

[0073] A stator cooling channel (325, 326) is formed in the side portion (320) surrounding the stator of the cylindrical frame so that the cooling liquid introduced through the inlet (I) can cool the stator (120) located inside the cylindrical frame (300).

[0074] And on the upper surface of the upper portion (310) of the cylindrical frame (300), an inverter cooling channel (311, 319) for cooling the inverter portion (200) is formed, and a rotor cooling channel is formed inside the drive shaft located at the center of the rotor.

[0075] The coolant flowing into the inlet (I) of the coolant inlet / outlet section (306) flows in direction A along the stator cooling channel (325) formed in the side section (320) surrounding the stator of the cylindrical frame as shown in FIG. 6 (a), and when it reaches near the 12 o'clock direction, since there is no longer a channel formed in the direction of the side section, it flows in direction B along the inverter cooling channel (311) formed on the upper surface of the upper section (310).

[0076] Next, the cooling liquid that flows into the rotor cooling channel, which is shaped like a pipe and is formed inside the drive shaft located at the center of the rotor, flows out in the C direction and then flows again in the D direction along the inverter cooling channel (319) formed on the upper surface of the upper part (310), and moves toward the 12 o'clock to 1 o'clock direction.

[0077] Next, the cooling liquid that reaches the 12 o'clock to 1 o'clock direction flows in the E direction along the stator cooling channel (326) formed in the side portion (320) that surrounds the stator (120) of the cylindrical frame, and then exits through the outlet (O) located near the 6 o'clock direction.

[0079] FIG. 7 is a perspective view in which the cylindrical frame (300) shown as translucent in FIG. 6 (a) is omitted so that only the cooling channel can be seen, and the cooling channel described above is shown more clearly.

[0080] Referring to FIG. 7, the cooling liquid introduced through the inlet (I) flows clockwise from position A1 to position A2 in the stator cooling channel (325) formed on the side portion (320) of the cylindrical frame (300), and then flows from position B1 to position B2 in the inverter cooling channel (311) formed on the upper portion of the cylindrical frame (300).

[0081] Next, it flows from position C1 to position C2 in the pipe-shaped rotor cooling channel (335) formed inside the drive shaft, then exits to position D1 in the inverter cooling channel (319) formed on the upper surface of the cylindrical frame (300), and then flows along the upper surface (310) of the cylindrical frame from position D1 to position D2. Then, it flows clockwise from position E1 to position E2 in the stator cooling channel (326) formed on the side surface (320) of the cylindrical frame (300), and then exits through the outlet (O).

[0083] Next, FIG. 8 is a front view of a water-cooled inverter-integrated drive motor according to an embodiment of the present invention, viewed from the x-axis direction indicated in FIG. 2, with the cross-sectional position indicated, and FIG. 9 is a cross-sectional view viewed from the cross-sectional position of FIG. 8.

[0084] It can be seen that the AA cross-section position in Fig. 8 corresponds to the upper surface of the cylindrical frame (300), and the stator cooling channels (325, 326) visible in the upper surface (310) of the cylindrical frame (300) shown in the AA cross-section of Fig. 9 are formed along the side portion (320) of the cylindrical frame (300) up to the depth of the BB cross-section and CC cross-section.

[0085] Additionally, as can be seen through the CC cross-section of FIG. 9, the rotor cooling channel (335) is a space between the inner surface of the drive shaft (150) and the outer surface of the column (330), which is formed by the column (330) formed in the center of the bottom surface of the cylindrical frame (300) inserted into the hollow part of the drive shaft (150). More preferably, the channel is blocked by a blocking wall (331) protruding radially on one side of the column (330) at the 6 o'clock direction, so that the cooling liquid introduced through the rotor cooling channel inlet (315) indicated in the BB cross-section flows along the C-shaped cooling channel and then exits through the rotor cooling channel outlet (316), thereby cooling the rotor (110) portion.

[0086] In addition, a cooling channel (337, 338) for the column may be formed inside the column (330) through a hole formed between a partition wall (336) that crosses from the 12 o'clock direction to the 6 o'clock direction.

[0088] Next, FIG. 10 is a drawing showing a cross-section of the cylindrical frame (300), showing the EE cross-section and FF cross-section indicated in the plan view of the cylindrical frame.

[0089] As shown in FIG. 10, a hollow portion may be formed inside the column portion (330) of the cylindrical frame (300), and a partition wall (336) may be formed across from the 12 o'clock direction to the 6 o'clock direction to block the cooling flow path (338) of the column portion on the left and the cooling flow path (337) of the column portion on the right. Additionally, if necessary, a horizontal communication flow path (339) may be formed at the bottom of the partition wall (336) of the column portion (330) to allow flow to occur. In this case, to form the communication flow path (339), a method may be applied in which the bottom of the column portion (330) is manufactured with a hole, and then a screw thread is formed on the bottom to cover it with a cap.

[0091] Meanwhile, FIG. 11 shows a drive shaft (150) coupled to the center of a rotor (110). As shown in FIG. 11, the drive shaft (150) may have a hollow portion (151) that is closed at the lower side and open at the upper side, which transmits driving force to the outside. Here, as previously explained, a stepped portion (157) is formed on the outer surface of the upper part of the drive shaft (150) so that the drive shaft (150) is supported by a bearing (140), and a keyway (158) is formed on the lower part of the drive shaft (150) so that a key (159) can be installed to connect a gear or pulley on the load side.

[0093] Next, FIG. 12 is a cross-sectional view of the connection between the cylindrical frame and the drive shaft, showing the drive shaft (150) inserted around the column portion (330) of the cylindrical frame, and shows the state in which the cylindrical frame (300) and the drive shaft (150) are connected on the FF cross-section shown in FIG. 10.

[0094] Referring to FIG. 12, a space is formed between the outer surface of the column portion (330) of the cylindrical frame and the inner surface of the hollow portion (151) of the drive shaft, and functions as a rotor cooling channel (335).

[0095] Additionally, a hollow portion may be formed inside the column portion (330) of the cylindrical frame (300), and a vertical partition (336) may be formed in the hollow portion to form a column portion cooling channel (337, 338), and a horizontally connected channel (339) may be formed at the lower end of the partition (336) so that the cooling liquid of the column portion cooling channel (337, 338) partitioned by the partition (336) may flow in a horizontal direction.

[0097] Next, FIG. 13 is a cross-sectional view showing the combination of a cylindrical frame, a drive shaft, and a flow path cover according to an embodiment of the present invention.

[0099] Referring to FIG. 13 and FIG. 10 to FIG. 12, a column portion (330) is formed protruding from the bottom surface of the upper surface portion (310) of the cylindrical frame (300) and extending in the direction of the rotation axis, so that the column portion (330) can be inserted into the hollow portion (151) of the drive shaft (150).

[0100] In addition, a drive shaft receiving portion (340) is formed on the bottom surface of the upper portion of the cylindrical frame, with a ring shape centered on the rotation axis extending in the direction of the rotation axis and protruding, so that the drive shaft can be coupled to the drive shaft receiving portion (340).

[0101] At this time, a bearing (140) is inserted between the drive shaft receiving portion (340) and the drive shaft (150), and an oil seal (130) is inserted and installed between the bearing (140) and the drive shaft receiving portion (340) to prevent leakage of the coolant.

[0103] Next, FIG. 14 is a perspective view showing the combined state of a cylindrical frame, a drive shaft, and a flow path cover according to an embodiment of the present invention, and FIG. 15 is a bottom perspective view showing the combined state of a cylindrical frame and a flow path cover according to an embodiment of the present invention and a plan view showing a sealant application area.

[0105] Referring to FIGS. 14, 5, and 10, an inlet (I) for the inflow of cooling liquid and an outlet (O) for the outflow of cooling liquid are formed on the side of the cylindrical frame (300), and a cooling channel (311, 319) may be formed in a left-right symmetrical shape on the upper surface of the cylindrical frame with respect to the centerline of the inlet (I) and the outlet (O).

[0106] Here, the inlet (I) and the outlet (O) may be formed in an inlet / outlet port fixing part (306) protruding from one side of the upper portion (320) of the cylindrical frame (300), and a bolt hole may be formed in the center of the inlet / outlet port fixing part (306) so that the inlet / outlet port (600) previously shown in FIG. 3 may be fixed.

[0107] And the inverter cooling channel (311, 319) on the upper surface of the cylindrical frame is in communication with the stator cooling channel (325, 326) formed on the side of the cylindrical frame, and the position of communication is preferably a position symmetrical with respect to the inlet (I) and the outlet (O) with respect to a reference line (two-dotted line in FIG. 5 and FIG. 14) placed on the plane of the upper surface that is orthogonal to the center line (one-dotted line in FIG. 5 and FIG. 14).

[0108] In addition, it is preferable that an inlet-side through hole (315) and an outlet-side through hole (316) are formed symmetrically with respect to the centerline (dotted line in FIG. 5 and FIG. 14) at a position corresponding to the rotor cooling channel (335) of the upper surface portion (310) of the cylindrical frame (300) so that the rotor cooling channel (335) and the inverter cooling channel (311, 319) are connected.

[0109] Meanwhile, on one side of the outer surface of the column portion formed protruding from the center of the bottom surface of the upper surface of the cylindrical frame, a barrier wall (331) protruding radially as shown in FIGS. 5 and FIGS. 9 may be formed, and the barrier wall (331) may be formed vertically from the bottom to the top of the column portion.

[0110] And as can be seen from the CC cross-section of FIG. 9, the rotor cooling channel (335) is blocked by a barrier wall (331) protruding radially on one side at the 6 o'clock direction of the column part (330), so that the cooling liquid introduced through the rotor cooling channel inlet (315) indicated in the BB cross-section flows along the C-shaped cooling channel and then exits through the rotor cooling channel outlet (316) to cool the rotor (110) part.

[0111] In addition, as shown in FIG. 14, the upper surface (310) of the cylindrical frame (300) is covered with a Euro cover (350), and as shown in FIG. 3 and FIG. 4, an inverter unit (200) may be mounted on the upper surface of the Euro cover (350), and the lower surface of a switching element (220) constituting the inverter unit (200) may be in contact with the upper surface of the Euro cover (350), and a heat sink (230) may be inserted as needed.

[0112] In addition, a cooling channel (351, 359) may be formed on the bottom surface of the Euro cover (350) in a shape corresponding to the cooling channel formed on the upper surface of the cylindrical frame as shown in FIG. 15.

[0114] In addition, a sealant (360) can be applied in the form shown in FIG. 15 to the area where the upper surface (310) and the lower surface (355) meet between the upper surface (310) of the cylindrical frame (300) and the lower surface (350) of the Euro cover (350) to prevent leakage of the cooling liquid.

[0116] The above detailed description of the present invention describes only specific embodiments thereof. However, it should be understood that the present invention is not limited to the specific forms mentioned in the detailed description, but rather should be understood to include all variations, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Explanation of the symbols

[0118] 100: Motor section 110: Rotor 120: Stator 130: Oil seal 140: Bearing 150: Drive shaft 151: Hollow part of the drive shaft 157: Step of the drive shaft 158: Keyway on the drive shaft 159: Drive shaft key 160: Bearing 170: Oil seal 200: Inverter section 210: Substrate 220: Switching element 230: Heat sink 290: Connector 300: Cylindrical frame 310: Upper surface of the cylindrical frame 311, 319: Inverter cooling channels on the upper surface of the cylindrical frame 315: Rotor cooling channel inlet side through hole 316: Rotor cooling channel outlet side through hole 320: Side of the cylindrical frame 325, 326: Stator cooling channels 330: Column of the cylindrical frame 331: Barrier wall of the column section of the cylindrical frame 335: Rotor cooling channel 337, 338: Column cooling channels 339: Chimney flow path inside the column 340: Drive shaft receiving portion of the cylindrical frame 350: Euro Cover 351, 359: Inverter cooling channel on the bottom surface of the Euro cover 360: Sealant 400: Inverter cover 401: Through hole in inverter cover 410: O-ring 500: Motor cover 501: Bolt 510: O-ring

Claims

Claim 1 The device comprises a motor unit having a rotor that rotates axially around a rotation axis and a stator surrounding the rotor, and an inverter unit having a switching element; a drive shaft having a rotor cooling channel formed inside is coupled to the center of the rotor, and a cylindrical frame with one end closed as an upper surface and a stator cooling channel formed on the side surrounding the stator is coupled to the upper part of the drive shaft; an inverter cooling channel for cooling the inverter unit is formed on the upper surface of the upper surface of the cylindrical frame, and a cooling liquid introduced from one side of the cylindrical frame passes through the stator cooling channel formed on the side of the cylindrical frame, the inverter unit cooling channel formed on the upper surface of the cylindrical frame, and the rotor cooling channel of the drive shaft, thereby cooling the stator, rotor, and inverter unit; the drive shaft has a hollow portion that is closed at the lower side for transmitting driving force to the outside and is open at the upper side; and a column portion is formed protruding from the lower surface in the direction of the rotation axis at the center of the lower surface of the upper surface of the cylindrical frame, and the column portion is of the drive shaft Water-cooled inverter-integrated drive motor inserted into the hollow section Claim 2 delete Claim 3 delete Claim 4 In claim 1, a drive shaft receiving portion is formed on the bottom surface of the upper portion of the cylindrical frame, the ring shape centered on the rotation axis is extended in the direction of the rotation axis and protruded, and the drive shaft is coupled to the drive shaft receiving portion, thereby forming a water-cooled inverter-integrated drive motor. Claim 5 In paragraph 4, a water-cooled inverter-integrated drive motor in which a bearing is inserted between the drive shaft receiving portion and the drive shaft, and an oil seal is inserted between the bearing and the drive shaft receiving portion. Claim 6 In claim 1, an inlet for introducing a cooling liquid and an outlet for introducing a cooling liquid are formed on the side of the cylindrical frame, and an inverter cooling channel is formed on the upper surface of the cylindrical frame in a left-right symmetrical shape with respect to the centerline of the inlet and the outlet, in a water-cooled inverter integrated drive motor. Claim 7 In claim 6, the inverter cooling channel on the upper surface of the cylindrical frame communicates with the stator cooling channel formed on the side of the cylindrical frame, and the communicating position is a position symmetrical with respect to the inlet and the outlet with respect to a reference line placed on the plane of the upper surface that is orthogonal to the centerline, in a water-cooled inverter integrated drive motor. Claim 8 In claim 6, a water-cooled inverter integrated drive motor having an inlet-side through hole and an outlet-side through hole formed symmetrically with respect to the centerline at a position corresponding to the rotor cooling channel on the upper surface of the cylindrical frame so as to communicate with the rotor cooling channel and the inverter cooling channel. Claim 9 In claim 1, a water-cooled inverter integrated drive motor having a barrier wall protruding radially formed on one side of the outer surface of the column portion. Claim 10 In claim 9, the above barrier wall is a water-cooled inverter integrated drive motor formed vertically from the bottom to the top of the column section. Claim 11 In claim 1, a water-cooled inverter integrated drive motor having a hollow portion formed inside the column portion of the cylindrical frame. Claim 12 In Clause 11, a water-cooled inverter-integrated drive motor having a vertical partition formed in the hollow portion of the column part of the cylindrical frame. Claim 13 In Clause 12, a water-cooled inverter-integrated drive motor having a horizontally connected flow path formed at the lower end of the bulkhead of the column portion of the cylindrical frame. Claim 14 In claim 1, a water-cooled inverter integrated drive motor is provided, wherein the upper surface of the cylindrical frame is covered with a flow path cover, and the inverter part is mounted on the upper surface of the flow path cover. Claim 15 In Clause 14, a water-cooled inverter integrated drive motor in which the bottom surface of a switching element constituting an inverter unit is in contact with the upper surface of the Euro cover. Claim 16 In claim 14, a water-cooled inverter-integrated drive motor having a cooling channel formed in the lower portion of the Euro cover in a shape corresponding to the cooling channel formed in the upper portion of the cylindrical frame. Claim 17 A water-cooled inverter-integrated drive motor according to any one of claims 14 to 16, wherein a sealant is applied to the portion where the upper surface and the lower surface of the cylindrical frame and the lower surface of the flow path cover meet. Claim 18 In claim 1, the inverter unit has a switching element disposed on a circular substrate, a connector is attached to the upper surface of the substrate, and an inverter cover is placed over the upper part of the inverter unit with a through hole provided so that the connector can protrude, and the inverter cover is coupled to the cylindrical frame, forming a water-cooled inverter integrated drive motor.

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