Laminated confluence busbar of high-power two-level inverter

Abstract

The utility model discloses a high-power two-level inverter laminated confluence busbar, which comprises a laminated confluence busbar, wherein the laminated confluence busbar consists of a first insulating layer, a connecting busbar, a second insulating layer, a third insulating layer, an anode busbar, a fourth insulating layer, a fifth insulating layer, a cathode busbar and a sixth insulating layer which are laminated from top to bottom. Compared with the prior art, through the arrangement of the laminated confluence busbar, the laminated confluence busbar is designed in a multi-layer lamination manner, so that the electric drive system can realize more connections in a smaller space, connection points between different electrical devices are reduced, the space utilization rate is improved, and the waste of materials is avoided; and meanwhile, through a power device separation insulation design form, parallel connection of a plurality of power devices is realized, redundant circulation loops are reduced, the current sharing effect is enhanced, the current bearing capacity is improved, the requirements of a high-power electric drive system are met, and the practicability and the convenience are effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to the stacked busbar of a high-power two-level inverter. Background Technology

[0002] The busbar in a motor drive system is a crucial component for the system's normal operation. The power module of the drive system connects to cables via output connectors, collects current onto the busbar, and then distributes it to different motors. Currently, the commonly used busbars in motor drive systems are typically of a constant cross-section structure, suitable for low-power motor drive systems. However, to meet current carrying requirements, the constant cross-section structure requires a large amount of metal material, resulting in high cost and low material utilization. Furthermore, in high-power electric drive systems, this type of busbar may exhibit insufficient current carrying capacity, severely impacting the system's stability and reliability. Utility Model Content

[0003] In order to overcome the shortcomings of the busbar structure commonly used in high-power electric drive systems and motor drive systems, which is usually of equal cross-section, the equal cross-section structure requires a large amount of metal material, resulting in high cost and low material utilization. Furthermore, the busbar structure of this type may have insufficient current carrying capacity. One of the purposes of this utility model is to provide a stacked busbar for high-power two-level inverters.

[0004] One of the objectives of this utility model is achieved through the following technical solution: a high-power two-level inverter stacked busbar, comprising a stacked busbar: the stacked busbar consists of a first insulating layer, a connecting busbar, a second insulating layer, a third insulating layer, a positive busbar, a fourth insulating layer, a fifth insulating layer, a negative busbar, and a sixth insulating layer stacked from top to bottom; the connecting busbar is composed of U-phase connecting copper busbars, V-phase connecting copper busbars, W-phase connecting copper busbars, and insulating layers connected between the U-phase connecting copper busbars, the V-phase connecting copper busbars, and the W-phase connecting copper busbars; the positive busbar... The upper surfaces of the busbar and the negative busbar are respectively provided with positive and negative terminal connection holes. The stacked busbar is connected to the positive and negative terminals of the power supply in the high-power motor drive system through the positive and negative terminal connection holes, respectively. The upper surfaces of the U-phase connecting copper busbar, the V-phase connecting copper busbar, and the W-phase connecting copper busbar are respectively provided with first, second, and third terminal connection holes. The stacked busbar is connected to the three phases (UVW) of the motor in the high-power motor drive system through the first, second, and third terminal connection holes, respectively. This facilitates the parallel connection of multiple power devices in a confined space, thereby reducing circulating current loops, improving space utilization, and meeting different usage requirements.

[0005] According to the high-power two-level inverter stacked busbar, the first insulating layer, the second insulating layer, the third insulating layer, the fourth insulating layer, the fifth insulating layer, and the sixth insulating layer are all formed by insulating media, thus exhibiting good insulation performance.

[0006] According to the high-power two-level inverter stacked busbar, a first connection hole is formed in a rectangular array on one side of the upper surface of the stacked busbar, square holes are formed at equal intervals on one side of the upper surface of the stacked busbar, and a second connection hole is formed at equal intervals on one side of the upper surface of the stacked busbar. The stacked busbar is connected to the power devices in the high-power motor drive system through the first connection hole, the square holes, the second connection hole, and bolts. This facilitates the installation of power devices on the stacked busbar.

[0007] According to the high-power two-level inverter stacked busbar, the power connection side of the positive busbar has a first inner ring connection hole and a first outer ring connection hole arranged in a linear array, while the power connection side of the negative busbar has a second outer ring connection hole and a second inner ring connection hole arranged in a linear array. This facilitates connection to the power supply of the high-power motor drive system through the positive and negative connection holes, thereby allowing current to converge onto the stacked busbar.

[0008] According to the high-power two-level inverter stacked busbar, the positive busbar has a first square connection hole arranged in a linear array on the motor connection side, and a third inner ring connection hole and a third outer ring connection hole arranged in a rectangular array on the side of the positive busbar closest to the first square connection hole. This facilitates the installation of the positive busbar with other components of the stacked busbar.

[0009] According to the high-power two-level inverter stacked busbar, the negative busbar has a second square connection hole arranged in a linear array on the motor connection side, and the positive busbar has a fourth inner ring connection hole and a fourth outer ring connection hole arranged in a rectangular array on the side near the second square connection hole. This facilitates the installation of the negative busbar with other components of the stacked busbar.

[0010] According to the high-power two-level inverter stacked busbar, the upper surfaces of the U-phase connecting copper busbar, the V-phase connecting copper busbar, and the W-phase connecting copper busbar are all equally spaced with fifth inner ring connecting holes and fifth outer ring connecting holes. This facilitates the connection and installation of other components on the stacked busbar.

[0011] The above-mentioned solution has the following beneficial effects:

[0012] Compared with existing technologies, this stacked busbar features a multi-layer design, enabling the electric drive system to achieve more connections in a smaller space. This reduces connection points between different electrical devices, improves space utilization, and avoids material waste. Furthermore, the power device isolation and insulation design allows for the parallel connection of multiple power devices, reducing redundant circulating current loops, enhancing current sharing, and improving current carrying capacity, thus meeting the needs of high-power electric drive systems.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0015] Figure 1 This is a schematic diagram of the overall structure of the stacked busbar of the high-power two-level inverter of this utility model;

[0016] Figure 2 This is a schematic diagram of the first connection hole of the stacked busbar of the high-power two-level inverter of this utility model;

[0017] Figure 3 This is a schematic diagram of the positive busbar structure of the stacked busbar of the high-power two-level inverter of this utility model;

[0018] Figure 4 This is a schematic diagram of the negative busbar of the stacked busbar of the high-power two-level inverter of this utility model;

[0019] Figure 5 This is a schematic diagram of the connection busbar of the stacked busbar of the high-power two-level inverter of this utility model.

[0020] Legend:

[0021] 100. Laminated busbar; 101. First connection hole; 401. Square hole; 402. Second connection hole; L1. First insulating layer; L2. Connecting busbar; 21. U-phase connecting copper busbar; 22. V-phase connecting copper busbar; 23. W-phase connecting copper busbar; 201. First wiring hole; 202. Second wiring hole; 203. Third wiring hole; 204. Fifth outer ring connecting hole; 205. Fifth inner ring connecting hole; L3. Second insulating layer; L4. Third insulating layer; L5. Positive busbar; 501. 502. First inner ring connection hole; 503. First outer ring connection hole; 504. First square connection hole; 505. Third inner ring connection hole; 506. Third outer ring connection hole; L6. Fourth insulating layer; L7. Fifth insulating layer; L8. Negative busbar; 801. Negative connection hole; 802. Second outer ring connection hole; 803. Second inner ring connection hole; 804. Second square connection hole; 805. Fourth outer ring connection hole; 806. Fourth inner ring connection hole; L9. Sixth insulating layer. Detailed Implementation

[0022] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0023] Reference Figure 1-5 A high-power two-level inverter stacked busbar, including a stacked busbar 100: the stacked busbar 100 is composed of a first insulating layer L1, a connecting busbar L2, a second insulating layer L3, a third insulating layer L4, a positive busbar L5, a fourth insulating layer L6, a fifth insulating layer L7, a negative busbar L8, and a sixth insulating layer L9 stacked from top to bottom. The connecting busbar L2 is composed of U-phase connecting copper busbar 21, V-phase connecting copper busbar 22, W-phase connecting copper busbar 23, and insulating layers connected between the U-phase connecting copper busbar 21, V-phase connecting copper busbar 22, and W-phase connecting copper busbar 23. The positive busbar L5 and the negative busbar L8 are connected by an insulating layer. The upper surface of bus 8 is provided with a positive terminal hole 501 and a negative terminal hole 801 respectively. The stacked busbar 100 is connected to the positive and negative terminals of the power supply in the high-power motor drive system through the positive terminal hole 501 and the negative terminal hole 801 respectively. The upper surfaces of the U-phase connecting copper busbar 21, V-phase connecting copper busbar 22 and W-phase connecting copper busbar 23 are provided with a first terminal hole 201, a second terminal hole 202 and a third terminal hole 203 respectively. The stacked busbar 100 is connected to the three phases of the motor UVW in the high-power motor drive system through the first terminal hole 201, the second terminal hole 202 and the third terminal hole 203 respectively.

[0024] This configuration allows multiple power devices to be installed in parallel via the stacked busbar 100, thereby reducing unnecessary circulating current loops, enhancing current sharing, and improving current carrying capacity, thus meeting the needs of high-power electric drive systems.

[0025] The first insulating layer L1, the second insulating layer L3, the third insulating layer L4, the fourth insulating layer L6, the fifth insulating layer L7, and the sixth insulating layer L9 are all formed by insulating media. A first connecting hole 101 is formed in a rectangular array on one side of the upper surface of the stacked busbar 100. Square holes 401 are equidistantly formed on one side of the upper surface of the stacked busbar 100. Second connecting holes 402 are equidistantly formed on one side of the upper surface of the stacked busbar 100. The stacked busbar 100 is connected to the power devices in the high-power motor drive system through the first connecting holes 101, square holes 401, second connecting holes 402, and bolts. The power connection side of the positive busbar L5 has a first inner ring connecting hole 502 and a first outer ring connecting hole 503 arranged in a linear array. The power connection side of the negative busbar L8 has a linear array... The second outer ring connection hole 802 and the second inner ring connection hole 803 are arranged in an alternating pattern. The motor connection side of the positive busbar L5 has a first square connection hole 504 in a linear array. The side of the positive busbar L5 near the first square connection hole 504 has a third inner ring connection hole 505 and a third outer ring connection hole 506 in a rectangular array. The motor connection side of the negative busbar L8 has a second square connection hole 804 in a linear array. The side of the positive busbar L5 near the second square connection hole 804 has a fourth inner ring connection hole 806 and a fourth outer ring connection hole 805 in a rectangular array. The upper surfaces of the U-phase connecting copper busbar 21, the V-phase connecting copper busbar 22 and the W-phase connecting copper busbar 23 are all equidistantly provided with a fifth inner ring connection hole 205 and a fifth outer ring connection hole 204.

[0026] With this configuration, the first insulating layer L1, the second insulating layer L3, the third insulating layer L4, the fourth insulating layer L6, the fifth insulating layer L7, and the sixth insulating layer L9 serve to insulate and separate the power devices. The second square connecting hole 804 and the first square connecting hole 504 are the same size. The third inner ring connecting hole 505 and the third outer ring connecting hole 506 are the same size as the fourth inner ring connecting hole 806 and the fourth outer ring connecting hole 805, respectively, thereby achieving mutual connection.

[0027] Working principle: Each layer of busbars can be connected to the other layers of the stacked busbar 100 and the power devices in the high-power motor drive system via bolts and connecting holes. The size of the connecting holes at the same connection position on different layers of busbars may not be the same. For example, the first outer ring connecting hole 503 on the positive busbar L5 and the second inner ring connecting hole 803 on the negative busbar L8. By adjusting the connection position of the same connecting hole and cooperating with bolts, different busbars and different power devices can be connected. This allows the electric drive system to complete the connection of multiple power devices in a small space through the stacked busbar 100, improving space utilization, reducing material waste, and thus achieving the parallel connection effect of multiple power devices to meet different usage requirements.

[0028] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A high-power two-level inverter laminated busbar, characterized in that, The application relates to a laminated busbar (100) comprising a first insulating layer (L1), a connecting busbar (L2), a second insulating layer (L3), a third insulating layer (L4), a positive busbar (L5), a fourth insulating layer (L6), a fifth insulating layer (L7), a negative busbar (L8) and a sixth insulating layer (L9) stacked from top to bottom, wherein the connecting busbar (L2) is composed of a U-phase connecting copper bar (21), a V-phase connecting copper bar (22), a W-phase connecting copper bar (23) and insulating layers arranged between the U-phase connecting copper bar (21), the V-phase connecting copper bar (22) and the W-phase connecting copper bar (23). The upper surfaces of the positive busbar (L5) and the negative busbar (L8) are respectively provided with a positive connection hole (501) and a negative connection hole (801), the laminated busbar (100) is connected with the positive and negative poles of a power supply in a high-power motor driving system through the positive connection hole (501) and the negative connection hole (801), and the upper surfaces of the U-phase connecting copper bar (21), the V-phase connecting copper bar (22) and the W-phase connecting copper bar (23) are respectively provided with a first connection hole (201), a second connection hole (202) and a third connection hole (203), the laminated busbar (100) is connected with motor UVW three-phase in the high-power motor driving system through the first connection hole (201), the second connection hole (202) and the third connection hole (203).

2. The high power two-level inverter laminated busbar according to claim 1, characterized in that, The first insulating layer (L1), the second insulating layer (L3), the third insulating layer (L4), the fourth insulating layer (L6), the fifth insulating layer (L7) and the sixth insulating layer (L9) are formed by insulating medium.

3. The high power two-level inverter laminated busbar according to claim 1, characterized in that, The upper surface of one side of the laminated busbar (100) is provided with a first connection hole (101) in a rectangular array, the upper surface of one side of the laminated busbar (100) is provided with a square hole (401) at equal intervals, the upper surface of one side of the laminated busbar (100) is provided with a second connection hole (402) at equal intervals, and the laminated busbar (100) is connected with power devices in a high-power motor driving system through the first connection hole (101), the square hole (401), the second connection hole (402) and bolts.

4. The high power two-level inverter laminated busbar of claim 1, wherein, The power supply connection side of the positive busbar (L5) is provided with a first inner ring connection hole (502) and a first outer ring connection hole (503) in a linear array and staggered, and the power supply connection side of the negative busbar (L8) is provided with a second outer ring connection hole (802) and a second inner ring connection hole (803) in a linear array and staggered.

5. The high power two-level inverter laminated busbar of claim 1, wherein, The motor connection side of the positive busbar (L5) is provided with a first square connection hole (504) in a linear array, and the side of the positive busbar (L5) close to the first square connection hole (504) is provided with a third inner ring connection hole (505) and a third outer ring connection hole (506) in a rectangular array.

6. The high power two-level inverter laminated busbar of claim 1, wherein, The motor connection side of the negative busbar (L8) is provided with second square connection holes (804) in a linear array, and the positive busbar (L5) is provided with fourth inner ring connection holes (806) and fourth outer ring connection holes (805) in a rectangular array near one side of the second square connection holes (804).

7. The high power two-level inverter laminated busbar of claim 1, wherein, The upper surfaces of the U-phase connecting copper bar (21), the V-phase connecting copper bar (22) and the W-phase connecting copper bar (23) are provided with fifth inner ring connection holes (205) and fifth outer ring connection holes (204) at equal intervals.

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