阅读说明：本技术 三相交流电机驱动系统控制器的主回路布置结构 (Main loop arrangement structure of three-phase alternating current motor driving system controller ) 是由 毛先叶 张公明 郭建文 于 2020-07-28 设计创作，主要内容包括：本发明公开了一种三相交流电机驱动系统控制器的主回路布置结构,本结构包括带有正负母排的功率模块以及支撑电容,其中功率模块的正负母排与支撑电容的正负母排分别采用螺栓、嵌件连接形成逆变主回路,功率模块的正负母排沿安装平面延伸至螺栓、嵌件位置,支撑电容的正负母排向功率模块方向水平延伸后垂直折弯至安装平面,然后沿安装平面延伸至螺栓、嵌件位置,功率模块的正负母排和支撑电容的正负母排在螺栓、嵌件位置同方向布置,功率模块的正负母排和支撑电容的正负母排在螺栓、嵌件位置分别通过螺栓、嵌件连接。本结构减少由杂散电感引起的浪涌电压,避免功率模块被击穿的危险,确保功率模块的开关特性,提高电机驱动控制的可靠性。(The invention discloses a main loop arrangement structure of a three-phase alternating current motor driving system controller, which comprises a power module with a positive bus bar and a negative bus bar and a supporting capacitor, wherein the positive bus bar and the negative bus bar of the power module are respectively connected with the positive bus bar and the negative bus bar of the supporting capacitor by bolts and inserts to form an inverter main loop, the positive bus bar and the negative bus bar of the power module extend to the positions of the bolts and the inserts along an installation plane, the positive bus bar and the negative bus bar of the supporting capacitor are vertically bent to the installation plane after horizontally extending towards the direction of the power module and then extend to the positions of the bolts and the inserts along the installation plane, the positive bus bar and the negative bus bar of the power module are arranged in the same direction of the positions of the bolts and the inserts, and the positive bus bar and the negative bus bar. The structure reduces surge voltage caused by stray inductance, avoids the danger of breakdown of the power module, ensures the switching characteristic of the power module, and improves the reliability of motor drive control.)

1. The utility model provides a main loop arrangement structure of three-phase alternating current motor drive system controller, includes the power module that has positive negative busbar and has the female support capacitor who arranges of positive negative busbar, wherein the positive busbar of power module and the positive busbar of support capacitor and the female row of negative busbar of power module and the female row of negative of support capacitor adopt bolt, inserts to connect respectively and form contravariant main loop, its characterized in that: the positive busbar and the negative busbar of the power module extend to the positions of the bolt and the insert along the mounting plane, the positive busbar and the negative busbar of the supporting capacitor are horizontally extended towards the power module and then are vertically bent to the mounting plane of the positive busbar and the negative busbar of the supporting capacitor, the positive busbar and the negative busbar of the supporting capacitor are arranged in a laminated mode in the same direction of the bolt and the insert, so that the current directions of the positive busbar of the power module and the positive busbar of the supporting capacitor at the joint are opposite, the current directions of the negative busbar of the power module and the negative busbar of the supporting capacitor at the joint are opposite, the area of a current flowing through a loop is minimum, and the positive busbar and the negative busbar of the power module and the positive busbar of the supporting capacitor are connected with the bolt and the insert through the bolt and the insert respectively.

2. The main circuit arrangement of a three-phase alternating current motor drive system controller according to claim 1, characterized in that: and the positive and negative busbars of the supporting capacitor are bent to at least form a parallel surface in the same direction as the positive and negative busbars of the power module.

3. The main circuit arrangement structure of a three-phase alternating current motor drive system controller according to claim 1 or 2, characterized in that: the positive and negative busbars of the supporting capacitor are bent to form a first horizontal plane, a vertical plane and a second horizontal plane, and the positive and negative busbars of the second horizontal plane are connected with the positive and negative busbars of the power module in parallel in the same direction by bolts and inserts.

4. The main circuit arrangement of a three-phase alternating current motor drive system controller according to claim 3, characterized in that: the bolt and the insert are positioned adjacent to the first horizontal plane and the first vertical plane, and the bolt and the insert form opposite current directions with the first horizontal plane and the first vertical plane of the connected busbar, so that the area of a current flowing through a loop is minimum.

5. The main circuit arrangement of a three-phase alternating current motor drive system controller according to claim 3, characterized in that: the area of a current at the joint of the positive busbar of the power module and the positive busbar of the support capacitor flowing through the loop is the smallest, and the area of a current at the joint of the negative busbar of the power module and the negative busbar of the support capacitor flowing through the loop is the smallest.

Technical Field

The invention relates to the technical field of motor control, in particular to a main loop arrangement structure of a three-phase alternating current motor driving system controller.

Background

High-frequency load adopted in three-phase alternating current motor driving systemThe wave drives the power module to open and close the tube at high speed, and surge voltage in proportion to the stray inductance of the driving main loop is loaded on the power module, and the surge voltage V₁Calculating the formula (1):

wherein the content of the first and second substances,

then

In the formula: l is stray inductance, phi is magnetic flux, I is current, B is magnetic induction intensity, a is length of the main loop connecting terminal busbar, w is width of the main loop connecting terminal busbar, h is interval of the laminated busbar, mu₀Is a vacuum magnetic permeability.

Therefore, the stray inductance is reduced to the maximum extent, and the surge voltage V can be reduced₁When surge voltage V₁When the size of the power module is too large, the power module may be broken down, and therefore, how to reduce the stray inductance of the driving main loop is an important research subject.

As shown in fig. 1 and fig. 2, a controller main loop is generally composed of a power module and a supporting capacitor, wherein the power module and the supporting capacitor are connected together by a bus bar through a bolt, and a positive bus bar 11 and a negative bus bar 12 of the power module 1 are connected with a positive bus bar 21 and a negative bus bar 22 of the supporting capacitor 2 through a bolt 3 and an insert 4; meanwhile, the areas B on the two sides of the bolt area A are in consideration of the assembly space and the insulation distance of the positive busbar and the negative busbar, and the areas B can not adopt a laminated mode to reduce the inductance, so that the stray inductance of the areas B is also larger. As shown in fig. 1 and 2, the busbars between the power module and the supporting capacitor are connected together by bolts, and current flows from the busbars of the capacitor to the busbars of the power module, wherein a current loop at the connection can be regarded as forming a current loop with the ground, and at this time, the loop area S through which the current flows is large, that is, S in formula 2 is large, and as can be seen from formula 2, the inductance L is large.

Due to the existence of stray inductance in the bolt area A and the areas B on two sides in the main loop, the switching characteristics of the power module are seriously affected, and the reliability of motor drive control is reduced.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a main loop arrangement structure of a three-phase alternating current motor driving system controller, which reduces surge voltage caused by stray inductance, avoids the danger of breakdown of a power module, ensures the switching characteristic of the power module and improves the reliability of motor driving control.

In order to solve the technical problem, the main loop arrangement structure of the three-phase alternating current motor driving system controller comprises a power module with a positive busbar and a negative busbar and a supporting capacitor with the positive busbar and the negative busbar, wherein the positive busbar of the power module and the positive busbar of the supporting capacitor as well as the negative busbar of the power module and the negative busbar of the supporting capacitor are respectively connected by bolts and inserts to form an inversion main loop, the positive busbar and the negative busbar of the power module extend to the positions of the bolts and the inserts along an installation plane, the positive busbar and the negative busbar of the supporting capacitor horizontally extend towards the power module and then are vertically bent to the installation plane of the positive busbar and the negative busbar and then extend to the positions of the bolts and the inserts along the installation plane, and the positive busbar and the negative busbar of the power module and the positive busbar of the supporting capacitor are arranged in a laminated manner in the same direction of the bolts and the inserts, so that the current directions of the positive, The current directions of the negative busbar of the power module and the negative busbar of the support capacitor at the joint are opposite, the area of the current flowing through a loop is minimum, and the positive busbar and the negative busbar of the power module and the positive busbar and the negative busbar of the support capacitor are connected at the positions of the bolt and the insert respectively through the bolt and the insert.

Furthermore, the positive busbar and the negative busbar of the support capacitor are bent to at least form a parallel surface in the same direction as the positive busbar and the negative busbar of the power module.

Further, the positive busbar and the negative busbar of the support capacitor are bent to form a first horizontal plane, a vertical plane and a second horizontal plane, and the positive busbar and the negative busbar of the second horizontal plane are connected with the positive busbar and the negative busbar of the power module in parallel in the same direction through bolts and inserts.

Further, the bolt and the insert are located adjacent to the first horizontal plane and the first vertical plane, and the bolt and the insert form opposite current directions with the first horizontal plane and the first vertical plane of the connected busbar, and at the moment, the area of a current flowing through a loop is minimum.

Furthermore, the area of the loop through which the current at the joint of the positive busbar of the power module and the positive busbar of the support capacitor flows is the smallest, and the area of the loop through which the current at the joint of the negative busbar of the power module and the negative busbar of the support capacitor flows is the smallest.

The invention adopts the technical scheme that the main circuit arrangement structure of the three-phase alternating current motor driving system controller comprises a power module with a positive busbar and a negative busbar and a supporting capacitor with the positive busbar and the negative busbar, wherein the positive busbar of the power module and a positive busbar of the supporting capacitor as well as a negative busbar of the power module and a negative busbar of the supporting capacitor are respectively connected by bolts and inserts to form an inversion main circuit, the positive busbar and the negative busbar of the power module extend to the positions of the bolts and the inserts along an installation plane, the positive busbar and the negative busbar of the supporting capacitor horizontally extend towards the power module and then are vertically bent to the installation plane and then extend to the positions of the bolts and the inserts along the installation plane, the positive busbar and the negative busbar of the power module and the positive busbar of the supporting capacitor are arranged in the same direction of the positions of the bolts and the inserts, and the positive busbar and the negative busbar of the power module, And (4) connecting the inserts. The structure reduces surge voltage caused by stray inductance, avoids the danger of breakdown of the power module, ensures the switching characteristic of the power module, and improves the reliability of motor drive control.

Drawings

The invention is described in further detail below with reference to the following figures and embodiments:

FIGS. 1 and 2 are schematic diagrams of a conventional controller main loop arrangement;

FIG. 3 is a schematic diagram of the main circuit arrangement of the controller of the three-phase AC motor driving system of the present invention;

FIG. 4 is a schematic diagram showing the arrangement of positive and negative busbars with bolts and inserts on the top surface of the supporting capacitor in the present structure;

fig. 5 is a schematic diagram of a positive and negative bus bar extension bending structure of the power module in the structure;

FIG. 6 is a schematic diagram of the arrangement of the positive and negative busbars in the power module with the bolts and the inserts;

fig. 7 is a schematic diagram of the arrangement of positive and negative busbars arranged up and down between the power module and the support capacitor in the structure;

fig. 8 is a schematic diagram of a positive and negative busbar connection terminal formed by a bolt and an insert in the structure;

fig. 9 is a schematic diagram of the connection of the positive busbar and the negative busbar in the structure by adopting bolts and inserts.

Detailed Description