KR102576429B1 - Inverter Integrated type In-wheel Motor - Google Patents

Abstract

The inverter-integrated in-wheel motor (1) of the present invention has a hollow assembly space (10) in which the inverter (90) or battery (300) is built-in, and an air duct ( The air-cooled cooling unit 1-1 consisting of 20) is built into the motor inner space of the motor 30 that rotates the rim 60, thereby eliminating the shaft and housing the motor 30, inverter 90, and battery ( 300) can be formed as an integrated structure, and in particular, it has the feature of effectively cooling the heat generated by the motor 30, the inverter 90, and the battery 300 by forming an air-cooled air flow in the inner space of the motor housing with a built-in inverter. It is implemented.

Description

Inverter Integrated type In-wheel Motor}

The present invention relates to in-wheel motors, and in particular, to an inverter-integrated in-wheel motor in which an inverter is built into the motor space without the shaft and the heat generated inside the motor can be effectively cooled by air cooling.

In general, in-wheel motors are installed inside the wheels of a vehicle to increase space utilization and efficiency, and are mounted on the rear wheels of eco-friendly vehicles, electric vehicles, and electric two-wheeled vehicles.

In particular, the in-wheel motor has a motor and rim integrated structure and is applied to electric two-wheeled vehicles as an inverter-separated in-wheel motor linked to a separate inverter and battery. In this case, the motor is a brushless motor.

For example, in the inverter-separated in-wheel motor, a motor capable of producing power is located inside the motor housing. A shaft that can be connected to the car body is located in the center of the motor housing, and the inverter and battery separately mounted on the car body are connected to the motor using a wire harness to drive the rear wheel of the electric two-wheeled vehicle.

Japanese Patent Application JP 2017-013592 A

However, the inverter-separated in-wheel motor uses a brushless motor that requires an inverter to drive, so it is necessary to secure space in the vehicle body (i.e., the body of an electric two-wheeled vehicle) to separately mount the inverter.

In particular, the inverter-separated in-wheel motor requires a wire harness (or cable) for electrical connection between the motor and the inverter, and the wire harness (or cable) increases the cable resistance as the distance from the inverter to the motor increases. In terms of efficiency, the efficiency is lower compared to the inverter-integrated in-wheel motor.

Accordingly, in consideration of the above, the present invention allows the motor and the inverter or battery to be formed into an integrated structure by embedding the inverter or battery in the inner space of the motor without the shaft. In particular, the inverter or battery is installed in the inner space of the motor with air-cooled air. The purpose is to provide an inverter-integrated in-wheel motor that can effectively cool the heat generated by the motor and inverter or battery by forming a flow.

The inverter-integrated in-wheel motor of the present invention for achieving the above object includes an air-cooled cooling unit built into the inner space of the motor of the motor surrounded by a motor housing and rotating the rim, and the air-cooled cooling unit is a hollow assembly space in which the inverter is installed. , and an air duct that introduces external air that cools the motor and the inverter, circulates the external air in the hollow assembly space, and then discharges it to the outside.

In a preferred embodiment, the hollow assembly space has a left/right open structure and has the same size as the hub width of the stator hub of the motor.

In a preferred embodiment, the hollow assembly space is provided with a connector, and the connector forms a power circuit and a signal circuit in the motor and the inverter.

In a preferred embodiment, the air duct is positioned to divide the hollow assembly space into an upper section and a lower section with respect to the center of the hollow assembly space, and independently forms the circulation of the external air in the upper section and the lower section. do.

In a preferred embodiment, the air duct is composed of a duct inlet that introduces the outside air, a duct body that circulates the outside air, and a duct outlet that discharges the outside air.

In a preferred embodiment, the duct inlet, the duct body, and the duct outlet are formed as an integrated structure, and the duct inlet and the duct outlet are located outside the hollow assembly space on one side of the hollow assembly space, and the duct The body is made of a “ㄹ” shaped hollow structure, and the “ㄹ” shaped hollow structure forms an air flow passage for the external air with the same size as the hub width of the stator hub of the motor.

In a preferred embodiment, a cover and a heat sink are coupled to the motor via bolts, and the cover and the heat sink seal the hollow assembly space.

In a preferred embodiment, the cover has a cover inlet hole and a cover outlet hole, the cover inlet hole sends the outside air to the air duct, and the cover discharge hole sends the outside air from the air duct to the outside. Take it out.

In a preferred embodiment, the heat sink is integrated with the inverter and includes heat dissipation fins.

In a preferred embodiment, the motor and the inverter are connected with a wire harness, and the wire harness is positioned into the hollow assembly space through the cover.

In a preferred embodiment, the rim is coupled to the rear wheel of an electric two-wheeled vehicle, and the power of the motor is transmitted to the rear wheel through the rim.

The in-wheel motor of the present invention implements the following actions and effects.

First, by embedding an inverter in the inner space of the motor housing secured by removing the shaft for connecting the car body, an in-wheel motor for an electric two-wheeled vehicle can be manufactured with an inverter-integrated structure. Second, by separating the inverter and battery from the vehicle body structure with an inverter-integrated in-wheel motor, the body structure of the electric two-wheeled vehicle can be used or additionally secured as a loading space for goods or a mounting space for the battery. Third, the heat dissipation problem for the motor and inverter can be effectively solved by airflow in the space inside the motor housing to cool the heat generated by the combined motor and inverter in an inverter integrated structure. Fourth, system efficiency is increased by reducing the distance between the motor and inverter due to the inverter integrated structure, and the existing separate wire harness (or cable) is not applied, which is advantageous in terms of maintenance due to good efficiency and smooth attachment and detachment. . Fifth, the inverter-integrated in-wheel motor uses the cover and inverter to form an air cooling path, so the larger the wheel size, the larger the space inside can be secured, thereby creating an air cooling path from the inverter-integrated structure to other electrical components such as batteries or DC-DC converters. It is possible to form a flow path.

Figure 1 is a configuration diagram of an inverter-integrated in-wheel motor according to the present invention, Figure 2 is a modified example of the motor internal space in the air cooling part of the inverter-integrated in-wheel motor according to the present invention, and Figure 3 is an inverter-integrated in-wheel motor according to the present invention. This is an example of the configuration of an air flow path duct in the air cooling part of the motor. Figure 4 is an exploded perspective view of the inverter-integrated in-wheel motor according to the present invention, Figure 5 is the electrical connection state of the inverter-integrated in-wheel motor according to the present invention, and Figure 6 is the present invention. This is an air-cooled state achieved by the inverter-integrated in-wheel motor according to the invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached illustration drawings. These embodiments are examples and may be implemented in various different forms by those skilled in the art to which the present invention pertains, so they are described herein. It is not limited to the embodiment.

1 to 3 show an in-wheel motor 1 applied to an electric two-wheeled vehicle 200 and an air-cooled cooling unit 1-1 formed thereon.

Referring to FIG. 1, the in-wheel motor 1 is mounted on the rear wheel 201 of the electric two-wheeled vehicle 200 on the vehicle body 203 side.

For example, the electric two-wheeled vehicle 200 is provided with a rear wheel 201 below the car body 203 forming the driver's seat, and the rear wheel 201 is assembled with the rim 60 of the in-wheel motor 1 to form a motor ( The power of 30) is transmitted through the rim (60). Therefore, the electric two-wheeled vehicle 200 is the same as a general electric two-wheeled vehicle to which the in-wheel motor 1 can be applied.

Referring to cross section A-A of FIG. 1, the in-wheel motor 1 is built inside the motor 30 and is surrounded by a stator hub 31, and has an air-cooled cooling unit 1-1 with both left and right sides exposed to the outside. ) is provided. In this case, the motor 30 is surrounded by a motor housing 40 to which a rim 60 is coupled, and is provided with a connector 50 for electrical connection in the space inside the motor, and is connected to the motor on one side (i.e., toward the left). The cover assembly pin 53 is protruded and coupled to the cover 70 (see FIG. 3).

For example, the air-cooled cooling unit 1-1 covers the left side of the cover fastening echo with the cover 70 (see FIG. 3) combined with the cover assembly pin 53, and the right side of the inverter fastening echo is covered by the air-cooled cooling unit. It is covered with the heat sink 93 (see FIG. 3) of the inverter 90 built into the inner space.

Therefore, the air-cooled cooling unit 1-1, with the inverter 90 built in, has a hollow assembly space 10 covered by the cover 70 and the heat sink 93, and the motor 30 and the inverter 90. It consists of an air duct 20 that circulates the external air (i.e., driving wind) introduced to be cooled in the hollow assembly space 10 and then exports it to the outside.

In particular, the air-cooled cooling unit 1-1 has an inverter width Wa (or a hub width Wa of the stator hub 31) and an inverter outer diameter d (or a hub inner diameter d of the stator hub 31). is formed in the size of the air-cooled cooling unit.

On the other hand, referring to FIG. 2, the inverter width (Wa) is changed to the battery width (Wb) (or the hub width (Wb) of the stator hub 31), and the inverter outer diameter (d) is changed to the battery outer diameter (D) (or It can be changed to the hub inner diameter (D) of the stator hub 31.

Therefore, the size of the air-cooled cooling unit 1-1 can be changed to match the inverter 90 or battery 300, which are components integrated into the in-wheel motor 1. In this case, the air-cooled cooling unit 1-1 ) has the inverter 90 and the battery 300 built in together, so the in-wheel motor 1 can be configured by deleting the cover assembly pin 53 and cover 70, which are required when only the inverter 90 is built in.

Referring to FIG. 3, the air-cooled cooling unit 1-1 has an air duct in which the hollow assembly space 10 is left and right covered by the cover 70 and the heat sink 93 of the inverter 90 (see FIG. 4). (20) is connected to the cover inlet hole 71 and the cover discharge hole 73 of the cover 70 through which external air (i.e., driving wind) enters and exits. In this case, the cover inlet hole 71 and the cover discharge hole 73 are formed opposite to each other, and a pair of first and second cover inlet holes 71a and 71b and a pair of first and second cover discharge holes ( 73a, 73b) (see FIG. 4).

In particular, the air duct 20 is composed of a pair of upper and lower air ducts 20-1 and 20-2, and the size of the upper and lower air ducts 20-1 and 20-2 is determined by the air cooling unit. It is matched to the inverter width (Wa) and inverter outer diameter (d) (or battery width (Wb) and battery outer diameter (D)), which are the sizes of (1-1).

Specifically, the upper air duct 20-1 and the lower air duct 20-2 are made of the same duct inlet 21, duct body 22, and duct outlet 23, and are hollow. They are arranged opposite to each other in the upper and lower directions with respect to the center of the assembly space 10 (i.e., 180° position arrangement).

Therefore, the upper air duct 20-1 communicates with the first cover inlet hole 71a (see FIG. 4) among the cover inlet holes 71 and hydraulically presses air through the first cover discharge hole 73. (73a) (see FIG. 4) to expel air, and the lower air duct 20-2 communicates with the second cover inlet hole 71b (see FIG. 4) among the cover inlet holes 71 to expel air. While applying hydraulic pressure, air is discharged through communication with the second cover discharge hole 73b (see FIG. 4) among the cover discharge holes 73.

For example, the duct body 22 is made of a “L” shaped hollow structure with the middle section as a connection part and both ends as open parts, and the “L” shaped hollow structure forms an air flow passage. In this case, the “ㄹ” shaped hollow structure has the same size as the hub width (Wa, Wb) of the stator hub 31 of the motor 30.

For example, the duct inlet 21 is connected to the first cover inlet hole 71a and the second cover inlet hole 71b by forming one of the openings at both ends of the duct body 22. And the duct outlet 23 is connected to the first cover outlet hole 73a and the second cover outlet hole 73b by forming an opposite opening among the openings at both ends of the duct body 22.

Therefore, the duct inlet 21 and the duct outlet 23 are located outside the hollow assembly space 10 on one side of the hollow assembly space 10 (i.e., the left side where the cover 70 is coupled). It is connected to the cover inlet hole 71 and the cover outlet hole 73 (see FIG. 4) formed on the edge of the disk with a “C” cross-sectional structure of the cover 70, respectively.

In this way, the in-wheel motor 1 is characterized as an inverter-integrated in-wheel motor in that the air-cooled cooling part 1-1 formed inside the motor in the donut shape of the motor 30 accommodates the inverter 90, and the inverter-integrated in-wheel motor The motor solves the heat generation problem of both the motor 30 and the inverter 90 by forming two independent space structures by the stator and cover in the donut-shaped inner space of the motor where the inverter 90 is exposed to the outside.

Meanwhile, Figures 4 and 5 show the disassembled configuration of the in-wheel motor 1.

Referring to FIG. 4, the in-wheel motor 1 includes an air cooling unit 1-1, a motor 30, a motor housing 40, a connector 50, a cover assembly pin 53, a rim 60, It includes a cover 70, a wire harness 80, an inverter 90, and a bolt 100.

For example, the motor 30 is a stator hub 31 to which the stator core 33 is coupled, forming a donut-shaped inner space of the motor, where the air-cooled cooling unit 1-1 is located, and the motor housing 40 is Surrounding the motor 30, the rim 60 is coupled to the stator hub 31 and rotated while surrounding the motor housing 40. In this case, the stator core 33 generates electromagnetic force with supplied power to rotate the motor 30, and is a motor component of a typical in-wheel motor.

For example, the connector 50 is provided on the stator hub 31 or the motor housing 40, and is coupled to one side (i.e., the cover 70) of the hollow assembly space 10 of the air cooling unit 1-1. It is located in the left part) and forms an electric circuit by connecting the wire harness 80. In addition, the cover assembly pin 53 protrudes to a predetermined length and is inserted into the pin hole opened in the cover 70 to cover one side of the hollow assembly space 10. In this case, the cover assembly pins 53 are composed of two and are symmetrically arranged in the up/down direction with respect to the center of the hollow assembly space 10.

For example, the cover 70 is made of a disk with a “C” cross-section structure and covers one side of the hollow assembly space 10, and a plurality of pin holes forming a circle at intervals from each other are drilled in the disk to form two pin holes 2. Two cover assembly pins 53 are inserted.

In particular, the cover 70 forms a cover hole 70a on the surface of the disk with an offset distance spaced from the center of the disk, so that a portion of the battery cable 81 of the wire harness 80 penetrates.

In addition, the cover 70 has a cover inlet hole 71 and a cover discharge hole 73 drilled at the edge of the disk, and the cover inlet hole 71 and the cover discharge hole 73 face each other with respect to the center of the disk. It is arranged (i.e., 180° positioned). In this case, the cover inlet hole 71 is formed of a pair of first and second cover inlet holes 71a and 71b spaced apart from each other, and the cover discharge hole 73 ) is formed by a pair of first and second cover discharge holes 73a and 73b spaced apart from each other.

For example, the wire harness 80 is connected to the motor 30 and the inverter 90 to form an electric circuit with power supply, and is composed of a battery cable 81 and a signal cable 83. In this case, one side of the battery cable 81 is connected to the battery 300 (see FIG. 2), and the other side that passes through the cover hole 70a of the cover 70 is connected to the power connector (50) of the connector 50. 51A) (see FIG. 5), and the signal cable 83 is connected to the signal connector 51B of the connector 50 (see FIG. 5) in the hollow assembly space 10 of the air cooling unit 1-1. connected.

For example, the inverter 90 has an inverter body located in the hollow assembly space 10 of the air cooling unit 1-1, a terminal 91 provided on the front of the inverter body, and a heat sink provided on the rear ( 93) is provided.

In particular, the terminal 91 is connected to the connector 50 to form an electric circuit. The heat sink 93 is formed to have a diameter slightly larger than the inverter outer diameter (d) (see FIG. 1), which is larger than the inverter body diameter, or the battery outer diameter (D) (see FIG. 2), and is formed into a plurality of pieces like the cover 70. A plate hole is drilled, and heat dissipation fins 93a are provided on the externally exposed surface. In this case, the heat dissipation fin (93a) dissipates the inverter heat to the outside.

For example, the bolt 100 fastens the cover 70 and the inverter 90 to the motor housing 40. Therefore, the cover 70 is connected to the motor with a bolt 100 that passes through a plurality of drilled pin holes. It is fixed to one side of the housing 40, and the inverter 90 is fixed to the opposite side of the motor housing 40 with bolts 100 that penetrate a plurality of pin holes drilled in the heat sink 93. In this case, the bolt 100 may be a screw.

Referring to FIG. 5, the connection between the connector 50 and the terminal 91 is made in the hollow assembly space 10 of the air cooling unit 1-1.

For example, the connector 50 consists of a power connector 51A and a signal connector 51B, and the terminal 91 consists of a power terminal 91A and a signal terminal 91B.

Therefore, the connection between the power connector 51A and the power terminal 91A forms a three-phase power circuit so that the stator core 33 of the motor 30 and the inverter 90 can receive power from the battery cable 81. make it possible In addition, the connection between the signal connector 51B and the signal terminal 91B forms a signal circuit so that the inverter 90 and/or the motor 30 receives various control signals from the signal cable 83 and uses a signal cable ( Various detection signals can be sent to 83).

Meanwhile, FIG. 6 shows an air cooling effect in which the inverter-integrated in-wheel motor 1 uses running wind as the air cooling unit 1-1 to simultaneously cool the motor 30 and the inverter 90.

As shown, the electric two-wheeled vehicle 200 generates driving power with the inverter-integrated in-wheel motor 1 applied to the rear wheel 201, so that the in-wheel motor 1 faces the wind path of the driving wind.

Then, the cover 70 of the in-wheel motor 1 uses the first and second cover inlet holes 71a and 71b as wind inlets to introduce the running wind into the air-cooled cooling unit 1-1, and ,2 Using the cover discharge holes (73a, 73b) as wind outlets, the traveling wind is discharged to the outside of the air-cooled cooling unit (1-1).

In this process of inflow and discharge of driving wind, the air duct 20 of the air cooling unit 1-1 transmits the driving wind through the upper and lower air ducts 20-1 and 20-2 into the hollow assembly space 10. ), the motor 30 (i.e., the stator core 33 and the inverter 90) are cooled together.

Specifically, the duct inlet 21 of the upper air duct 20-1 and the duct inlet 21 of the lower air duct 20-2 are each configured to absorb the traveling wind entering the first and second cover inlet holes 71a and 71b. flows in, and the flowing wind is distributed to the duct body 22 of the upper air duct 20-1 and the duct body 22 of the lower air duct 20-2, respectively.

Then, the duct body 22 circulates the traveling wind into the internal space of the “ㄹ” shaped hollow structure to form a hollow assembly space for the motor 30 (i.e., the upper/lower sections of the stator core 33 and the inverter 90) ( 10) Heat exchange occurs with the traveling wind.

As a result, the heat generation temperature of the motor 30 (i.e., the stator core 33) and the inverter 90 are lowered together by the heat exchange effect of the traveling wind, so that the temperature can always be maintained at an appropriate temperature even while driving.

Then, the running wind heated in the duct body 22 is discharged from the duct body through the duct outlet 23 of the upper air duct 20-1 and the duct outlet 23 of the lower air duct 20-2, respectively. As it escapes from (22) to the outside, the newly introduced cold air circulates again in the duct body (22).

In this way, the upper and lower air ducts 20-1 and 20-2 continuously receive driving wind, so that the in-wheel motor 1 can be driven without heat generation problems in both the motor 30 and the inverter 90.

As described above, the inverter-integrated in-wheel motor 1 according to the present embodiment introduces external air together with the hollow assembly space 10 in which the inverter 90 or the battery 300 is built into the hollow assembly space 10. The air-cooled cooling unit (1-1), which consists of an air duct (20) for cooling the interior, is built into the motor interior space of the motor (30) that rotates the rim (60), thereby eliminating the shaft and forming the motor (30) into the motor interior space. The inverter 90 and the battery 300 can be formed into an integrated structure, and in particular, heat generation from the motor 30, the inverter 90, and the battery 300 is achieved by forming an air-cooled air flow in the inner space of the motor housing in which the inverter is built. can be cooled effectively together.

1: In-wheel motor
1-1: air cooling unit 10: hollow assembly space
20: air duct 20-1,20-2: upper/lower air duct
21: duct inlet 22: duct body
23: Duct outlet
30: motor 31: stator hub
33: stator core
40: motor housing 50: connector
51A: Power connector 51B: Signal connector
53: Cover assembly pin
60: Rim 70: Cover
70a: cover hole 71: cover inlet hole
71a, 71b: 1st and 2nd cover inlet holes
73: Cover discharge hole 73a, 73b: 1st, 2nd cover discharge hole
80: wire harness 81: battery cable
83: signal cable
90: Inverter 91: Terminal
91A: Power terminal 91B: Signal terminal
93: heat sink 93a: heat sink fin
100: bolt
200: Electric two-wheeled vehicle 201: Rear wheel
203: body
300: Battery

Claims (16)

It includes an air-cooled cooling unit built into the inner space of the motor that is surrounded by the motor housing and rotates the rim,
The air-cooled cooling unit consists of a hollow assembly space in which the inverter is built, and an air duct that introduces external air that cools the motor and the inverter, circulates the external air in the hollow assembly space, and then discharges it to the outside,
The air duct is located at the center of the hollow assembly space by dividing the hollow assembly space into an upper section and a lower section.
The in-wheel motor according to claim 1, wherein the hollow assembly space has a left/right open structure.
The in-wheel motor according to claim 2, wherein the hollow assembly space is the same size as the hub width of the stator hub of the motor.
The method according to claim 2, wherein the hollow assembly space is provided with a connector,
The in-wheel motor, wherein the connector forms a power circuit and a signal circuit in the motor and the inverter.
delete The in-wheel motor according to claim 1, wherein the air duct independently forms the circulation of the external air in the upper section and the lower section.
The in-wheel motor according to claim 1, wherein the air duct is comprised of a duct inlet for introducing the external air, a duct body for forming circulation of the external air, and a duct outlet for discharging the external air.
The in-wheel motor according to claim 7, wherein the duct inlet, the duct body, and the duct outlet are formed as an integrated structure.
The in-wheel motor according to claim 8, wherein the duct inlet and the duct outlet are located outside the hollow assembly space on one side of the hollow assembly space.
The in-wheel motor according to claim 7, wherein the duct body is made of an “ㄹ” shaped hollow structure, and the “ㄹ” shaped hollow structure forms an air flow passage for the external air.
The in-wheel motor according to claim 10, wherein the “L” shaped hollow structure has the same size as the hub width of the stator hub of the motor.
The in-wheel motor according to claim 1, wherein a cover and a heat sink are coupled to the motor via bolts, and the cover and the heat sink seal the hollow assembly space.
The method of claim 12, wherein the cover has a cover inlet hole and a cover outlet hole, the cover inlet hole sends the outside air to the air duct, and the cover discharge hole sends the outside air from the air duct to the outside. An in-wheel motor characterized by pulling out.
The in-wheel motor according to claim 12, wherein the heat sink is integrated with the inverter and includes heat dissipation fins.
The in-wheel motor according to claim 12, wherein the motor and the inverter are connected to a wire harness, and the wire harness is positioned into the hollow assembly space through the cover.
The in-wheel motor according to claim 1, wherein the rim is coupled to a rear wheel of an electric two-wheeled vehicle, and power of the motor is transmitted to the rear wheel through the rim.

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