KR-20260062756-A - Water-cooled inverter integrated drive motor

KR20260062756AKR 20260062756 AKR20260062756 AKR 20260062756AKR-20260062756-A

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.

Inventors

최강호

Assignees

주식회사 현대케피코

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (18)

A rotor that rotates axially around a rotation axis and A motor part having a stator surrounding the rotor and the above-mentioned rotor It includes an inverter section having a switching element, A drive shaft having a rotor cooling channel formed inside is coupled to the center of the above rotor, and A cylindrical frame with one side closed to the upper surface, having a stator cooling channel formed in a side portion 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 portion of the above-mentioned cylindrical frame, A water-cooled inverter-integrated drive motor that cools the stator, rotor, and inverter section by means of a cooling liquid introduced from one side of the cylindrical frame, passing through a stator cooling channel formed on the side of the cylindrical frame, an inverter section cooling channel formed on the upper surface of the cylindrical frame, and a rotor cooling channel of the drive shaft.
In paragraph 1, The lower side of the above drive shaft that transmits driving force to the outside is closed, and The upper side is a water-cooled inverter-integrated drive motor having an open hollow section.
In paragraph 2, At the center of the bottom surface of the upper surface of the above-mentioned cylindrical frame A column portion is formed protruding and extending in the direction of the rotation axis from the bottom surface, A water-cooled inverter-integrated drive motor in which the above-mentioned column portion is inserted into the hollow portion of the above-mentioned drive shaft
In paragraph 2, A drive shaft receiving portion is formed on the bottom surface of the upper portion of the above-mentioned cylindrical frame, with a ring shape centered on a rotation axis extending in the direction of the rotation axis and protruding, and a water-cooled inverter-integrated drive motor in which the drive shaft is coupled to the drive shaft receiving portion.
In paragraph 4, A bearing is inserted between the drive shaft housing and the drive shaft, and A water-cooled inverter-integrated drive motor in which an oil seal is inserted between the above bearing and the above drive shaft housing.
In paragraph 2, An inlet for the coolant to flow in and an outlet for the coolant to flow out are formed on the side of the above-mentioned cylindrical frame, and Based on the centerline of the inlet and the outlet mentioned above A water-cooled inverter integrated drive motor having an inverter cooling channel formed in a left-right symmetrical shape on the upper surface of the above-mentioned cylindrical frame
In paragraph 6, 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 A water-cooled inverter-integrated drive motor in a position that is vertically symmetric with respect to the inlet and the outlet, with respect to a reference line placed on the plane of the upper surface portion that is orthogonal to the centerline.
In paragraph 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.
In paragraph 3, A water-cooled inverter-integrated drive motor having a radially protruding barrier wall formed on one side of the outer surface of the above-mentioned column.
In Paragraph 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.
In paragraph 3, A water-cooled inverter-integrated drive motor having a hollow section formed inside the column portion of the above-mentioned cylindrical frame
In Paragraph 11, A water-cooled inverter-integrated drive motor having a vertical partition formed in the hollow portion of the column of the above-mentioned cylindrical frame
In Paragraph 12, A water-cooled inverter-integrated drive motor having a horizontal communication channel formed at the lower end of the bulkhead of the column portion of the above-mentioned cylindrical frame.
In paragraph 1, The upper surface of the above-mentioned cylindrical frame is covered with a Euro cover, and A water-cooled inverter integrated drive motor, on which the inverter unit is mounted, is mounted on the upper surface of the above Euro cover.
In Paragraph 14, A water-cooled inverter-integrated drive motor in which the bottom surface of a switching element constituting the inverter unit is in contact with the upper surface of the above Euro cover.
In Paragraph 14, A water-cooled inverter-integrated drive motor having a cooling channel formed in the lower surface of the above-mentioned Euro cover in a shape corresponding to the cooling channel formed in the upper surface of the above-mentioned cylindrical frame.
In any one of paragraphs 14 through 16, A water-cooled inverter-integrated drive motor in which a sealant is applied to the area where the upper surface and the lower surface meet, between the upper surface of the cylindrical frame and the lower surface of the Euro cover.
In paragraph 1, The above inverter unit has switching elements arranged on a circular substrate, and A connector is attached to the upper surface of the above substrate, and An inverter cover having a through hole so that the connector can protrude is placed over the upper part of the above inverter section, and the water-cooled inverter integrated drive motor in which the inverter cover is coupled to the cylindrical frame.

Description

Water-cooled inverter integrated drive motor 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. 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. And one of the key components of e-mobility is the electric motor that provides the propulsion power. 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. 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. 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. 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. 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. 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. 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). 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. 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. Therefore, it is necessary to develop technology that can also cool the rotor in water-cooled inverter-integrated drive motors. 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