KR102692998B1 - Power cable connecting structure of electric motor - Google Patents

Abstract

The present invention relates to a power cable connection structure for an electric motor. The present invention relates to a structure for connecting a power cable to an external housing and an electric motor including a stator and a rotor provided inside the external housing, a circuit board provided on the first side of the external housing and having a board extension portion. ; and a connection terminal fixed to the board extension part, wherein the cable terminal of the power cable is connected to the connection terminal.

Description

Power cable connection structure of electric motor {POWER CABLE CONNECTING STRUCTURE OF ELECTRIC MOTOR}

The present invention relates to a cable connection structure for an electric motor. More specifically, the present invention relates to a connection structure of a cable connected to an electric motor for driving the electric motor.

Electric motors that generate driving force using electricity are used in various fields. For example, means of transportation such as electric vehicles and electric two-wheeled vehicles include electric motors that generate driving force using electric energy supplied from an electric source such as a high-voltage battery.

A power cable is connected to the electric motor to supply power. For example, when three-phase power is supplied to drive an electric motor, a plurality of power cables for supplying U-phase, V-phase, and W-phase power are connected to the electric motor.

However, when connecting a power cable to an electric motor, it is necessary to provide a separate terminal block for connecting the power cable. Additionally, the housing of the electric motor may protrude in the longitudinal or radial direction along the rotation axis due to the connection structure of the power cable.

Japanese Patent Publication No. 5935894

The purpose of the present invention is to provide a power cable connection structure for an electric motor that can compactly configure the electric motor and reduce the number of components of the electric motor by improving the structure for connecting the power cable to the electric motor.

The present invention relates to a structure for connecting a power cable to an external housing and an electric motor including a stator and a rotor provided inside the external housing, a circuit board provided on the first side of the external housing and having a board extension portion. ; and a connection terminal fixed to the board extension part, wherein the cable terminal of the power cable is connected to the connection terminal.

In one embodiment, the connection terminal includes a substrate fixing part fixed to the board extension part, a cable terminal fixing part fixing the cable terminal, and a winding connecting part fixing the lead wire of the winding of the stator.

Additionally, the substrate fixing part and the cable terminal fixing part may be formed on a plate part connected to the winding connection part.

Additionally, the connection terminal may be formed by cutting and processing a conductive plate.

Additionally, the winding connection part may be processed into a cylindrical shape.

In one embodiment, the circuit board is equipped with a rotation detection sensor that detects rotation of the rotor.

In one embodiment, a connection terminal fixing part to which the connection terminal is fixed is formed on the board extension part, and the connection terminal fixing part may include an inner locking part formed in the board extension part.

Additionally, the substrate fixing part may include a first substrate fixing bar and a second substrate fixing bar connected to each other on one side so as to be spaced apart from each other with a substrate fixing gap in between.

Additionally, the first substrate fixing bar and the second substrate fixing bar may each include a first substrate fixing protrusion and a second substrate fixing protrusion that are caught by the inner locking portion.

In addition, the connection terminal fixing portion further includes an end-side locking portion formed on an end side of the substrate extension portion, and the substrate fixing gap is configured in a tapered shape that narrows inward so that the end-side locking portion is inserted into the substrate fixing gap. You can.

In one embodiment, the cable terminal fixing unit includes a first cable terminal fixing bar and a second cable terminal fixing bar, one side of which is connected to each other, and the cable terminal is located between the first cable terminal fixing bar and the second cable terminal fixing bar. is combined with

In addition, the first cable terminal fixing bar and the second cable terminal fixing bar may each include a first through-hole fixing protrusion and a second through-hole fixing protrusion formed to be caught on an inner end of the through hole of the cable terminal.

Additionally, the first cable terminal fixing bar and the second cable terminal fixing bar may each have a first cable terminal contact protrusion and a second cable contact protrusion that contact the cable terminal.

Additionally, the distance between the first cable terminal contact protrusion and the second cable terminal contact protrusion is set to be smaller than the thickness of the cable terminal, and when the cable terminal is inserted, the cable terminal may be elastically deformed to pressurize the cable terminal.

According to the present invention, there is no need to provide a terminal block or terminal fixing screw when connecting a power cable to an electric motor, which has the advantage of reducing the number of parts and reducing the radial protrusion size of the cable coupling portion for connecting the power cable.

In addition, according to the present invention, it is possible to fix the power cable to the electric motor through a simple insertion operation through the connection terminal, which has the effect of shortening the assembly time of parts.

Figure 1 is a diagram showing a state in which a power cable is connected to an electric motor.
Figure 2 is a perspective view (a) showing a state in which the external housing has been removed from the electric motor shown in Figure 1, and a perspective view (b) showing a state in which the external housing has been removed from the electric motor according to an embodiment of the present invention.
Figure 3 is a diagram showing a power cable connection structure of an electric motor according to an embodiment of the present invention.
Figure 4 is an exploded perspective view showing a circuit board, a connection terminal, and a power cable in the power cable connection structure of an electric motor according to an embodiment of the present invention.
Figure 5 is a perspective view of a connection terminal included in the power cable connection structure of an electric motor according to an embodiment of the present invention.
Figure 6 is a diagram showing a state in which a power cable is coupled to a circuit board through a connection terminal in the power cable connection structure of an electric motor according to an embodiment of the present invention.
Figure 7 is a cross-sectional view showing a state in which a power cable is coupled to a circuit board through a connection terminal in the power cable connection structure of an electric motor according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. First, when adding reference numerals to components in each drawing, it should be noted that identical components are given the same reference numerals as much as possible even if they are shown in different drawings. Additionally, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted. In addition, preferred embodiments of the present invention will be described below, but the technical idea of the present invention is not limited or restricted thereto, and of course, it can be modified and implemented in various ways by those skilled in the art.

FIG. 1 is a diagram showing a state in which a power cable is connected to an electric motor, and FIG. 2 is a perspective view (a) showing a state in which the external housing is removed from the electric motor shown in FIG. 1, according to an embodiment of the present invention. This is a perspective view (b) showing the external housing removed from the electric motor.

Figure 1 is a perspective view of the electric motor 1 viewed from the side opposite to the side where the drive shaft 6 is exposed, and Figure 2 (a) is a perspective view of the electric motor 1 viewed from the side where the drive shaft 6 is exposed. am. 1 and 2 (a) show an electric motor 1 in contrast to the electric motor 100 according to the present invention.

The electric motor 1 includes an external housing 2 that forms an external structure, and a stator and a rotor (not shown) are provided inside the external housing 2. A stator housing 5 surrounding the stator may be provided inside the outer housing 2, and a cooling fluid for cooling may be supplied between the outer housing 2 and the stator housing 5. For convenience of explanation, the part where the drive shaft 6 is exposed in the electric motor 1 is referred to as the lower surface (5, 'second surface'), and the opposite surface is referred to as the upper surface (3, 'first surface'). do. The upper surface 3 of the electric motor 1 is equipped with a rotation detection sensor 15 for detecting the rotation of the rotor included inside the electric motor 1 or a temperature sensor for detecting the temperature of the electric motor 1. A circuit board 14 may be provided.

A rotation detection sensor 15 is provided on the circuit board 14, a communication connector 16 for communication between the electric motor 1 and the outside, and a temperature sensor located inside the electric motor 1 are connected. A sensor connector 19, etc. may be provided. The communication cable 18 is fixed to the upper surface 3 by a communication cable fixing block 17, and one side of the communication cable 18 may be coupled to the communication connector 16.

Meanwhile, a cable coupling portion 7 to which a power cable 9 for supplying power to the electric motor 1 is coupled may be provided on one side of the upper surface 3. A plurality of power cables (9) are fixed to the cable coupling portion (7) by a cable fixing block (12), and the connection terminals (10: 10a, 10b, 10c) of the power cable (9) are connected to the terminal block (8). It is fixed by a fixing screw (11). The power cable 9 may include a U-phase power cable 9a, a V-phase power cable 9b, and a W-phase power cable 9c.

However, in the case of this electric motor 1, the cable coupling portion 7 is more likely to protrude toward the radial side of the external housing 2 as a terminal block 8 for coupling the power cable 9 must be provided. .

Referring to (b) of FIG. 2, an electric motor 100 according to an embodiment of the present invention is shown, and the electric motor 100 according to the present invention has a cable coupling portion 20 to which the power cable 9 is coupled. ) is characterized by reducing the degree of radial protrusion.

Figure 3 is a diagram showing a power cable connection structure of an electric motor according to an embodiment of the present invention, and Figure 4 is a diagram showing a circuit board, a connection terminal, and a power cable connection structure of an electric motor according to an embodiment of the present invention. It is an exploded perspective view showing a power cable, and Figure 5 is a perspective view of a connection terminal included in the power cable connection structure of an electric motor according to an embodiment of the present invention. In addition, Figure 6 is a diagram showing a state in which a power cable is coupled to a circuit board through a connection terminal in the power cable connection structure of an electric motor according to an embodiment of the present invention, and Figure 7 is a diagram showing an embodiment of the present invention. This is a cross-sectional view showing a state in which the power cable is connected to the circuit board through the connection terminal in the power cable connection structure of the electric motor according to the present invention.

The power cable connection structure of an electric motor according to an embodiment of the present invention will be described with reference to FIGS. 3 to 7.

The power cable connection structure of an electric motor according to an embodiment of the present invention is a connection in which one side is coupled to the circuit board 30 and the board extension 40 and the power cable 9 is coupled to the board extension 40. Includes terminal 50.

The circuit board 30 is coupled to the upper surface 3 of the electric motor 100. In one embodiment, the circuit board 30 is located on one side of a rotor (not shown) built into the electric motor 100. The drive shaft 6 coupled with the rotor is exposed on the other side of the rotor. The circuit board 30 is equipped with a rotation detection sensor 15 to detect the rotation of the rotor, and a communication connector 34 for communication between the electric motor 100 and the outside is located inside the electric motor 100. A temperature sensor connector 38 to which a temperature sensor is connected may be provided. The communication cable 36 is fixed to the upper surface 3 by a communication cable fixing block 35, and one side of the communication cable 36 may be coupled to the communication connector 34.

A board extension 40 extending from the circuit board 30 is provided on one side of the circuit board 30 .

The electric motor 100 includes a cable coupling portion 20, and a power cable 9 is fixed to the cable coupling portion 20 through a cable fixing block 22. The power cable 9 may include a U-phase power cable 9a, a V-phase power cable 9b, and a W-phase power cable 9c, and a cable at the end of each power cable 9a, 9b, and 9c. Terminals 10a, 10b, and 10c may be provided, respectively. In one embodiment, the cable terminal 10 may be configured to include a donut-shaped terminal including a through hole (H).

The cable terminal 10 of the power cable 9 may be fixed to the board extension 40 of the circuit board 30 through the connection terminal 50.

Referring to FIG. 4 , a connection terminal fixing portion 42 for fixing the connection terminal 50 may be formed on the substrate extension portion 40 . In one embodiment, the terminal fixing portion 42 may be formed to include an end-side locking portion 42a and an inner locking portion 42b. The end-side locking portion 42a may be formed in a groove or notch shape on the end side of the substrate extension portion 40. The inner locking portion 42b may be provided in a form that penetrates the circuit board 30 vertically.

The connection terminal 50 may include a winding connection part 52 that secures the lead wire of the winding provided in the stator of the electric motor 100, and a plate part 54 coupled to the winding connection part 52. In one embodiment, the winding connection portion 52 may be provided in a hollow cylindrical shape, and the plate portion 54 may be formed through a cutting process such as press processing or laser processing of a conductive plate. The connection terminal 50 can be formed by welding the separately processed winding connection part 52 and the plate part 54. In addition, in the practice of the present invention, after forming the plate through a cutting process such as press processing or laser processing of the entire shape including the winding connection portion 52 and the plate portion 54, the winding connection portion 52 is formed. It may also be possible to construct the connection terminal 50 by processing the portion to be cylindrical.

The detailed configuration of the connection terminal 50 will be described with reference to FIG. 5 . Figure 5(a) is a perspective view of the connection terminal 50, and Figure 5(b) is a view of the connection terminal 50 viewed from the bottom of the winding connection portion 52.

The plate part 54 of the connection terminal 50 may include a substrate fixing part 56 and a cable terminal fixing part 60.

The substrate fixing part 56 may include a first substrate fixing bar 56a and a second substrate fixing bar 56b connected on one side to be spaced apart from each other with a substrate fixing gap 58 in between. At the entrance side of the substrate fixing gap 58, a first substrate fixing protrusion 57a is formed on the first substrate fixing bar 56a and protrudes downward, and a second protruding upwardly protruding on the second substrate fixing bar 56b. A substrate fixing protrusion 57b is formed. The first substrate fixing protrusion 57a and the second substrate fixing protrusion 57b are formed to be rounded toward the outside of the substrate fixing gap 58 so that they can be easily inserted into the end of the substrate extension 40. It may be desirable. In addition, the first and second substrate fixing protrusions 57a and 57b are formed at an angle toward the inside of the substrate fixing gap 58, so that the first and second substrate fixing protrusions 57a and 57b extend the substrate. It may be desirable to make it difficult to separate after being caught on the inner locking portion 42b of the part 40.

Meanwhile, the substrate fixing gap 58 may have a tapered shape whose width becomes narrower from the entrance side to the inside. This is to ensure that the end-side locking portion 42a of the terminal fixing portion 42 formed on the substrate extending portion 40 is maintained inserted between the substrate fixing gap 58.

The cable terminal fixing unit 60 includes a first cable terminal fixing bar 60a and a second cable terminal fixing bar 60b, one side of which is connected to each other. In one embodiment, the opening direction of the cable terminal fixing part 60 may be opposite to the opening direction of the board fixing part 56. The first cable terminal fixing bar 60a and the second cable terminal fixing bar 60b are spaced apart to form cable terminal fixing gaps 63 and 64. In one embodiment, a first cable terminal fixing bar (60a) is provided on one side of the innermost inner cable terminal fixing gap (63) formed by the first cable terminal fixing bar (60a) and the second cable terminal fixing bar (60b). ) and the second cable terminal fixing bar 60b, a first through-hole fixing protrusion 62a and a second through-hole fixing protrusion 62b are formed, respectively, protruding toward the gap. In addition, on the entrance side of the central cable terminal fixing gap 64, a first cable terminal contact protrusion 66a and a second cable terminal fixing bar 60a and a second cable terminal fixing bar 60b protrude toward the gap. Cable terminal contact protrusions 66b are formed, respectively. With this configuration, the cable terminal 10 of the power cable 9 is fixed to the cable terminal fixing part 60.

Referring to (b) of FIG. 5, the lead wire 70 of the winding provided on the stator is fixed to the winding connection portion 52. For stable power supply, it may be desirable that the total area in contact with the cable terminal 10 by the cable terminal fixing part 60 is greater than or equal to the total cross-sectional area of the lead wire 70 fixed to the winding connection part 52.

6 and 7, the connection terminal 50 is fixed to the board extension 40 of the circuit board 30, and the cable terminal 10 of the power cable 9 is connected to the connection terminal 50. The fixing configuration is explained.

The connection terminal 50 is fixed to the circuit board 30 by inserting the board fixing part 56 into the terminal fixing part 42 formed on the board extension part 40 of the circuit board 30 . Specifically, the terminal fixing part 42 is inserted between the first board fixing bar 56a and the second board fixing bar 56b of the connection terminal 50. The first and second board fixing protrusions 57a and 57b formed on the first and second board fixing bars 56a and 56b are inserted into the inner locking portion 42b of the terminal fixing part 42. The end-side locking portion 42a of the terminal fixing portion 42 is fitted into the substrate fixing gap 58 formed between the first and second substrate fixing bars 56a and 56b. The spacing of the first and second substrate fixing bars 56a and 56b may be set to allow slight elastic deformation when inserted into the terminal fixing portion 42. Since the first and second substrate fixing bars 56a and 56b are formed by processing the plate, the first and second substrate fixing bars 56a and 56b may have sufficient elasticity against deformation.

The cable terminal 10 of the power cable 9 is inserted and coupled to the cable terminal fixing part 60. Specifically, the cable terminal 10 is inserted between the first cable terminal fixing bar 60a and the second cable terminal fixing bar 60b of the cable terminal fixing part 60, and the through-hole fixing protrusions 62a and 62b are provided. is inserted into the through hole (H) of the cable terminal 10 to prevent the cable terminal 10 from being separated. Meanwhile, the cable terminal contact protrusions 66a and 66b press the upper and lower surfaces of the cable terminal 10. In one embodiment, the gap between the cable terminal contact protrusions 66a and 66b before the cable terminal 10 is inserted may be smaller than the thickness of the cable terminal 10. The cable terminal contact protrusions 66a and 66b can be elastically deformed when the cable terminal 10 is inserted, and can be fixed by pressing the cable terminal 10.

Meanwhile, the lead wire 70 of the winding is fixed to the winding connection portion 52.

In connection using the connection terminal 50, the lead wire 70 is fixed to the winding connection part 52, and then the substrate fixing part 56 of the connection terminal 50 is coupled to the terminal fixing part 42. Thereafter, the cable terminal 10 can be inserted into the cable terminal fixing part 60 of the connection terminal 50 to complete the coupling of the power cable 9. Of course, in the practice of the present invention, the lead wire 70 is coupled to the connection terminal 50, the connection terminal 50 is connected to the terminal fixing part 42, and the cable terminal 10 is connected to the connection terminal 50. The order of the combining process may be changed.

According to the present invention, the number of parts is reduced because there is no need to provide a terminal block 8 or a terminal fixing screw 11, and the radial protrusion size of the cable coupling portion 20 for connecting the power cable 9 can be reduced. The power cable can be fixed with a simple insertion operation.

The above description is merely an illustrative explanation of the technical idea of the present invention, and those skilled in the art will be able to make various modifications, changes, and substitutions without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments and the attached drawings. . The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

30: circuit board
40: substrate extension part
42: Connection terminal fixing part
50: connection terminal
52: winding connection
54: plate part
56: Board fixing part
58: substrate fixing gap
60: Cable terminal fixing part

Claims (14)

In a structure for connecting a power cable to an external housing and an electric motor including a stator and a rotor provided inside the external housing,
a circuit board provided on a first side of the external housing and including a board extension part; and
It includes a connection terminal fixed to the substrate extension part,
A cable terminal of the power cable is connected to the connection terminal,
The connection terminal includes a substrate fixing part fixed to the board extension part, a cable terminal fixing part fixing the cable terminal, and a winding connection part fixing the lead wire of the winding of the stator. structure. delete According to claim 1,
A power cable connection structure, wherein the substrate fixing part and the cable terminal fixing part are formed on a plate part connected to the winding connection part. In the third paragraph,
A power cable connection structure characterized in that the above connection terminal is formed by cutting and processing a conductive plate material. According to claim 4,
A power cable connection structure, wherein the winding connection portion is processed into a cylindrical shape. According to claim 1,
A power cable connection structure, wherein the circuit board is equipped with a rotation detection sensor that detects rotation of the rotor. According to claim 1,
A power cable connection structure, wherein a connection terminal fixing part to which the connection terminal is fixed is formed on the board extension part, and the connection terminal fixing part includes an inner locking part formed in the board extension part. According to claim 7,
A power cable connection structure wherein the substrate fixing portion includes a first substrate fixing bar and a second substrate fixing bar connected to each other on one side so as to be spaced apart from each other with a substrate fixing gap in between. According to claim 8,
The first substrate fixing bar and the second substrate fixing bar each include a first substrate fixing protrusion and a second substrate fixing protrusion that are caught by the inner locking portion. According to clause 9,
The connection terminal fixing portion further includes an end-side locking portion formed on an end side of the substrate extension portion, and the substrate fixing gap is configured to have a tapered shape that narrows toward the inside, so that the end-side locking portion is fitted into the substrate fixing gap. Power cable connection structure. The method according to any one of claims 1 and 3 to 10,
The cable terminal fixing unit includes a first cable terminal fixing bar and a second cable terminal fixing bar, one side of which is connected to each other, and the cable terminal is coupled between the first cable terminal fixing bar and the second cable terminal fixing bar. power cable connection structure. According to claim 11,
The first cable terminal fixing bar and the second cable terminal fixing bar are each provided with a first through-hole fixing protrusion and a second through-hole fixing protrusion formed to be caught on an inner end of a through hole of the cable terminal. Connection structure. According to claim 12,
A power cable connection structure, wherein the first cable terminal fixing bar and the second cable terminal fixing bar each include a first cable terminal contact protrusion and a second cable contact protrusion that contact the cable terminal. According to claim 13,
The gap between the first cable terminal contact protrusion and the second cable terminal contact protrusion is set to be smaller than the thickness of the cable terminal, and when the cable terminal is inserted, the power cable connection structure is elastically deformed to press the cable terminal. .

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