CN112087184B - Main loop arrangement structure of three-phase alternating current motor driving system controller - Google Patents
Main loop arrangement structure of three-phase alternating current motor driving system controllerInfo
- Publication number
- CN112087184B CN112087184B CN202011056814.9A CN202011056814A CN112087184B CN 112087184 B CN112087184 B CN 112087184B CN 202011056814 A CN202011056814 A CN 202011056814A CN 112087184 B CN112087184 B CN 112087184B
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- Prior art keywords
- positive
- power module
- bus bars
- negative
- busbar
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a main loop arrangement structure of a three-phase alternating current motor driving system controller, which comprises a power module with positive and negative busbar and a supporting capacitor with positive and negative busbar, wherein the positive and negative busbar of the power module and the positive and negative busbar of the supporting capacitor are respectively connected by welding to form an inversion main loop, the positive and negative busbar of the power module horizontally extends to the outer side of a power module body along a mounting plane and then extends to the upper side of the power module body through 180-degree bending, the positive and negative busbar of the supporting capacitor horizontally extends to the surfaces of the positive and negative busbar of the power module along the mounting plane and is attached, and the attaching part is connected by welding, so that the current direction of the positive and negative busbar of the power module and the positive and negative busbar of the supporting capacitor at the connecting part is opposite, and the area of a current flowing through a loop is minimum. The structure effectively 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.
Description
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
In the three-phase alternating current motor driving system, a high-frequency carrier wave is adopted to drive a power module in a high-speed switching tube, surge voltage proportional to the stray inductance of a driving main loop is loaded on the power module, and the surge voltage V 1 is calculated as shown in formula (1):
Wherein, the
Then
Wherein L is stray inductance, phi is magnetic flux, I is current, B is magnetic induction intensity, a is the length of the main loop connecting terminal busbar, w is the width of the main loop connecting terminal busbar, h is the interval between laminated busbar, and mu 0 is vacuum magnetic conductivity.
It can be seen that minimizing the stray inductance can reduce the surge voltage V 1, and when the surge voltage V 1 is too large, the power module may be broken down and damaged, so how to reduce the stray inductance of the driving main loop is an important research topic.
As shown in fig. 1 and 2, the main circuit of the controller is generally composed of a power module and a supporting capacitor, wherein the power module and the supporting capacitor are connected together through a busbar by adopting bolts, as shown in fig. 1, one side of a busbar 4 of the power module 1 is connected with a copper layer of an insulating substrate 3, the other side of the busbar is connected with a busbar 5 of the supporting capacitor 2 through bolts 6 and inserts 7, as shown in fig. 2, the busbar 4 of the power module 1 and the busbar 5 of the supporting capacitor 2 are crimped together through a crimping tool 8 and a crimping tool 9, and then the busbar 4 of the power module 1 and the busbar 5 of the supporting capacitor 2 are connected together through welding 10.
As shown in fig. 1 or fig. 2, the distance a is the length of the busbar of the bolt connection or welding connection part, and mainly considers the space required by the bolt connection or welding, and the use and installation space of tools and tools, and the distance B is the length between the insulating substrate 3 and the terminal part of the connection busbar 4 in the power module, and is generally encapsulated by resin in the range of the distance B;
The current loop in the region of the interval a and the interval B can be regarded as a current loop with the earth, and the loop area S through which the current flows is large, that is, a×h in equation 2 is large, and as can be seen from equation 2, the inductance L increases.
The stray inductances in the space A and space B areas exist in the main loop, so that the switching characteristics of the power module are seriously affected, and the reliability of motor driving 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 effectively reduces surge voltage caused by stray inductance, avoids the risk 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 problems, the main loop arrangement structure of the three-phase alternating current motor driving system controller comprises a power module with positive and negative bus bars and a supporting capacitor with positive and negative bus bars, wherein the positive and negative bus bars of the power module and the positive and negative bus bars of the supporting capacitor are respectively connected in a welding mode to form an inversion main loop, the positive and negative bus bars of the power module horizontally extend to the outer side of a power module body along a mounting plane and then extend to the upper side of the power module body through 180-degree bending, the positive and negative bus bars of the supporting capacitor horizontally extend to the surfaces of the positive and negative bus bars of the power module along the mounting plane and are attached, and the attaching positions of the positive and negative bus bars of the supporting capacitor and the positive and negative bus bars of the power module are connected in a welding mode, so that the current directions of the positive and negative bus bars of the power module and the positive and negative bus bars of the supporting capacitor are opposite at the connecting positions, and the current flows through the area of the loop is minimum.
Further, the positive and negative busbar of the power module is bent to form at least a parallel surface attached to the positive and negative busbar of the supporting capacitor.
Further, the positive and negative busbar of the power module is bent to sequentially form a first horizontal plane, a vertical plane and a second horizontal plane, and the positive and negative busbar of the supporting capacitor is attached to the second horizontal plane of the positive and negative busbar of the power module through horizontal and vertical bending and is connected in parallel in a welding mode.
Further, the second horizontal plane of the positive and negative busbar of the power module and the first horizontal plane form opposite current directions, at the moment, the area of current flowing through the loop is minimum, the second horizontal plane of the positive and negative busbar of the power module and the horizontal plane of the positive and negative busbar of the supporting capacitor form opposite current directions, at the moment, the area of current flowing through the loop is minimum, and the vertical plane of the positive and negative busbar of the power module and the vertical plane of the positive and negative busbar of the supporting capacitor form opposite current directions, at the moment, the area of current flowing through the loop is minimum.
Further, the distance between the first horizontal plane and the second horizontal plane of the positive and negative busbar of the power module is as small as possible, and the distance between the vertical plane of the positive and negative busbar of the power module and the vertical plane of the positive and negative busbar of the supporting capacitor is as small as possible, so that the area of current flowing through the loop is minimum.
Further, the heights between the positive and negative bus bars extending from the side surface of the body and the positive and negative bus bars extending from the side surface of the body of the power module are as small as possible or as flush with each other.
Further, the welding mode of the positive and negative busbar of the supporting capacitor and the second horizontal plane of the positive and negative busbar of the power module is laser welding.
The main loop arrangement structure of the three-phase alternating current motor driving system controller adopts the technical scheme that the main loop arrangement structure comprises a power module with positive and negative busbar and a supporting capacitor with positive and negative busbar, wherein the positive and negative busbar of the power module and the positive and negative busbar of the supporting capacitor are respectively connected by welding to form an inversion main loop, the positive and negative busbar of the power module horizontally extends to the outer side of a power module body along a mounting plane and then extends to the upper side of the power module body through 180-degree bending, the positive and negative busbar of the supporting capacitor horizontally extends to the surfaces of the positive and negative busbar of the power module along the mounting plane and is attached, and the attaching part is connected by welding, so that the current direction of the positive and negative busbar of the power module and the positive and negative busbar of the supporting capacitor at the connecting part is opposite, and the current flowing through the loop area is minimum. The structure effectively 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 attached drawings and embodiments:
FIG. 1 is a schematic diagram of a main circuit arrangement of a conventional controller employing bolting;
FIG. 2 is a schematic diagram of a main circuit arrangement of a conventional controller connected by welding;
FIG. 3 is a schematic diagram of the primary circuit arrangement of the present three-phase AC motor drive system controller;
Fig. 4 is a schematic diagram of bending the positive and negative busbar of the power module and the positive and negative busbar of the supporting capacitor in the structure.
Detailed Description
The embodiment of the invention is shown in fig. 3, the main loop arrangement structure of the three-phase alternating current motor driving system controller comprises a power module 1 with a positive busbar 4 and a negative busbar 5 and a supporting capacitor 2 with a positive busbar 5, wherein the positive busbar 4 and the negative busbar 5 of the power module 1 are respectively connected by welding to form an inversion main loop, the positive busbar 4 and the negative busbar 4 of the power module 1 horizontally extend to the outer side of a power module 1 body along a mounting plane and then extend to the upper side of the power module 1 body through 180 DEG bending, the positive busbar 5 and the negative busbar 5 of the supporting capacitor 2 horizontally extend to the surface of the positive busbar 4 and are attached to the positive busbar 4 of the power module 1 along the mounting plane, and the attaching part of the positive busbar 5 and the negative busbar 4 of the supporting capacitor 2 is connected by welding 10, so that the current direction of the positive busbar 4 and the negative busbar 5 of the power module 1 is opposite to the current direction of the positive busbar 5 of the supporting capacitor 2 at the connecting part, and the current flowing through the loop area is minimum at the moment.
Preferably, the positive and negative bus bars 4 of the power module 1 are bent to form at least parallel surfaces attached to the positive and negative bus bars 5 of the supporting capacitor 2.
Preferably, as shown in fig. 4, the positive and negative bus bars 4 of the power module 1 are bent to form a first horizontal plane 41, a vertical plane 42 and a second horizontal plane 43 in sequence, and the positive and negative bus bars 5 of the supporting capacitor 2 are attached to the second horizontal plane 43 of the positive and negative bus bars 4 of the power module 1 through horizontal and vertical bending and are connected in parallel by means of welding 10.
Preferably, the second horizontal plane 43 of the positive and negative busbar 4 of the power module 1 and the first horizontal plane 41 form opposite current directions, the area of current flowing through the loop is minimum, the second horizontal plane 43 of the positive and negative busbar 4 of the power module 1 and the horizontal plane 51 of the positive and negative busbar 5 of the supporting capacitor 2 form opposite current directions, the area of current flowing through the loop is minimum, and the vertical plane 42 of the positive and negative busbar 4 of the power module 1 and the vertical plane 52 of the positive and negative busbar 5 of the supporting capacitor 2 form opposite current directions, and the area of current flowing through the loop is minimum.
Preferably, the distance between the first horizontal plane 41 and the second horizontal plane 43 of the positive and negative busbar 4 of the power module 1 is as small as possible, preferably less than 5mm, and the distance between the vertical plane 42 of the positive and negative busbar 4 of the power module 1 and the vertical plane 52 of the positive and negative busbar 5 of the supporting capacitor 2 is as small as possible, preferably less than 5mm, at this time, the area of the current flowing through the loop is the smallest.
Preferably, the height between the positive and negative bus bars 4 extending from the side of the body of the power module 1 and the positive and negative bus bars 5 extending from the side of the body of the supporting capacitor 2 is as small as possible, and preferably the value is less than 3mm, or is even.
Preferably, the welding mode of the positive and negative busbar 5 of the supporting capacitor 2 and the second horizontal plane 43 of the positive and negative busbar 4 of the power module 1 is laser welding.
In the structure, the positive and negative busbar 4 of the power module 1 is extended and bent for 180 degrees to form a connecting surface in the same direction as the positive and negative busbar 5 of the supporting capacitor 2, but the power module 1 and the supporting capacitor 2 can be deformed in various ways according to structural arrangement, the power module is not limited to the extending and bending of the positive and negative busbar 4 of the power module 1, the positive and negative busbar 5 of the supporting capacitor 2 can be extended and bent as well, and finally the positive and negative busbars of the power module 1 and the supporting capacitor 2 are welded or connected by bolts or inserts after being arranged in the same direction at the connecting position.
As shown in FIG. 4, the positive and negative bus bars 4 of the power module 1 extend along the installation plane, then bend 180 degrees and extend to a welding position above the body of the power module 1, the positive and negative bus bars 5 of the supporting capacitor 2 extend along the installation plane and then extend to the welding position after being bent twice, namely a vertical plane 52 and a horizontal plane 51, so that the current direction at the connection position of the positive and negative bus bars 4 of the power module 1 and the positive and negative bus bars 5 of the supporting capacitor 2 is opposite, the area of current flowing through a loop is minimum, the vertical plane 42 of the positive and negative bus bars 4 of the power module 1 and the vertical plane 52 of the positive and negative bus bars 5 of the supporting capacitor 2 form opposite current directions, the distance between the vertical plane 42 of the positive and negative bus bars 4 of the power module 1 and the vertical plane 52 of the positive and negative bus bars 5 of the supporting capacitor 2 is smaller than 5mm, the area of current flowing through the loop is minimum, and the height between the positive and negative bus bars 4 of the power module 1 extending from the side of the body and the positive and negative bus bars 5 of the supporting capacitor 2 extending from the side of the body is smaller than 3mm.
In the structure, positive and negative busbar between the power module and the supporting capacitor are respectively connected together by adopting welding or two groups of bolts and inserts, current flows from the busbar of the supporting capacitor to the busbar of the power module, the current flowing through the busbar at the busbar connection position is opposite in direction, the formed current flows through the smallest loop area, namely a multiplied by h in the formula 2 is the smallest, and the stray inductance L is the smallest according to the formula 2, so that the stray inductance of a main loop connected by the power module and the supporting capacitor is reduced.
In the structure, a positive busbar 4 and a negative busbar 5 of a power module 1 are connected with a positive busbar 5 and a negative busbar 5 of a supporting capacitor 2 through welding 10, and a connecting joint surface is in a parallel direction of an installation plane of the power module, wherein current flows from the busbar 4 to the busbar 5, as shown in fig. 3 to 4, I1 is current of a first horizontal plane 41 of the busbar 4 of the power module 1, I2 is current of a vertical plane 42 of the busbar 4 of the power module 1, I3 is current of a second horizontal plane of the busbar 4 of the power module 1, I4 is current of a horizontal plane 51 of the busbar 5 of the supporting capacitor 2, and I5 is current of a vertical plane 52 of the busbar 5 of the supporting capacitor 2; the distance between the second horizontal plane 43 of the busbar 4 of the power module 1 and the first horizontal plane 41 is as small as possible, the current direction of I1 and I3 is opposite, the loop area through which current flows is minimum at this moment, the stray inductance at this position is reduced, the second horizontal plane 43 is connected with the horizontal plane 51 of the busbar 5 of the supporting capacitor 2, the current direction of I3 and I4 is opposite, the loop area through which current flows is minimum at this moment, the stray inductance at this position is reduced, the distance between the vertical plane 42 of the busbar 4 of the power module 1 and the vertical plane 52 of the busbar 5 of the supporting capacitor 2 is as small as possible, the height between the busbar 4 extending from the side face of the body of the power module 1 and the busbar 5 extending from the side face of the body of the supporting capacitor 2 is as small as possible, the current direction of I2 and I5 is opposite, the loop area through which current flows is minimum at this moment, and the stray inductance at this position is reduced.
Therefore, the structure can solve the difficult problem that the stray inductance at the joint of the power module 1 and the supporting capacitor 2 is overlarge, and reduce the stray inductance in the interval A and interval B areas, thereby reducing the stray inductance of the whole main loop, reducing the surge voltage caused by the stray inductance, avoiding the danger that the power module is broken down, ensuring the switching characteristic of the power module and improving the reliability of motor driving control.
Claims (5)
1. The main loop arrangement structure of the three-phase alternating current motor driving system controller comprises a power module with positive and negative busbar and a supporting capacitor with positive and negative busbar, wherein the positive and negative busbar of the power module and the positive and negative busbar of the supporting capacitor are respectively connected by welding to form an inversion main loop; the power module is characterized in that positive and negative bus bars of the power module horizontally extend to the outer side of the power module body along the installation plane and then extend to the upper side of the power module body through 180-degree bending, positive and negative bus bars of the supporting capacitor horizontally extend to the surfaces of the positive and negative bus bars of the power module along the installation plane and are attached, attachment positions of the positive and negative bus bars of the supporting capacitor and the positive and negative bus bars of the power module are connected by welding, so that current directions of the positive and negative bus bars of the power module and the positive and negative bus bars of the supporting capacitor at the attachment positions are opposite, and at the moment, the area of a current flowing through a loop is minimum;
the positive and negative busbar of the power module is bent to sequentially form a first horizontal plane, a vertical plane and a second horizontal plane, and the positive and negative busbar of the supporting capacitor is attached to the second horizontal plane of the positive and negative busbar of the power module through horizontal and vertical bending and is connected in parallel in a welding mode;
The distance between the first horizontal plane and the second horizontal plane of the positive and negative busbar of the power module is as small as possible, and the distance between the vertical plane of the positive and negative busbar of the power module and the vertical plane of the positive and negative busbar of the supporting capacitor is as small as possible, so that the area of current flowing through the loop is minimum.
2. The main circuit arrangement of a three-phase AC motor drive system controller as set forth in claim 1, wherein the positive and negative bus bars of the power module are bent to form at least parallel surfaces in contact with the positive and negative bus bars of the support capacitor.
3. The main circuit arrangement structure of a three-phase alternating current motor driving system controller according to claim 1, wherein the second horizontal plane of the positive and negative bus bars of the power module and the first horizontal plane form opposite current directions, the area of current flowing through the loop is minimum, the second horizontal plane of the positive and negative bus bars of the power module and the horizontal plane of the positive and negative bus bars of the supporting capacitor form opposite current directions, the area of current flowing through the loop is minimum, and the vertical plane of the positive and negative bus bars of the power module and the vertical plane of the positive and negative bus bars of the supporting capacitor form opposite current directions, the area of current flowing through the loop is minimum.
4. The main circuit arrangement of a three-phase AC motor drive system controller as set forth in claim 1, wherein the height between the positive and negative bus bars extending from the body side of the power module and the positive and negative bus bars extending from the body side of the support capacitor is as small as possible or as flush.
5. The main circuit arrangement structure of a three-phase alternating current motor driving system controller according to claim 1, wherein the welding mode of attaching the positive and negative bus bars of the supporting capacitor to the second horizontal plane of the positive and negative bus bars of the power module is laser welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011056814.9A CN112087184B (en) | 2020-09-29 | 2020-09-29 | Main loop arrangement structure of three-phase alternating current motor driving system controller |
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| CN202011056814.9A CN112087184B (en) | 2020-09-29 | 2020-09-29 | Main loop arrangement structure of three-phase alternating current motor driving system controller |
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| CN112087184A CN112087184A (en) | 2020-12-15 |
| CN112087184B true CN112087184B (en) | 2025-07-25 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109102921A (en) * | 2017-06-20 | 2018-12-28 | 株洲中车时代电气股份有限公司 | Composite bus bar and preparation method thereof |
| CN209283104U (en) * | 2019-02-01 | 2019-08-20 | 广东美的暖通设备有限公司 | Rectification inverter circuit component and frequency converter |
| CN213027876U (en) * | 2020-09-29 | 2021-04-20 | 上海大郡动力控制技术有限公司 | Main loop arrangement structure of three-phase alternating current motor driving system controller |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617413B (en) * | 2015-01-19 | 2017-04-12 | 株洲南车时代电气股份有限公司 | Horizontal overlapping type power terminal |
| EP3341965B1 (en) * | 2016-02-24 | 2019-04-24 | ABB Schweiz AG | Power module based on a multi-layer circuit board |
| CN208158447U (en) * | 2018-05-16 | 2018-11-27 | 西安埃克森电源有限公司 | A kind of connection structure of IGBT and DC master row |
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2020
- 2020-09-29 CN CN202011056814.9A patent/CN112087184B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109102921A (en) * | 2017-06-20 | 2018-12-28 | 株洲中车时代电气股份有限公司 | Composite bus bar and preparation method thereof |
| CN209283104U (en) * | 2019-02-01 | 2019-08-20 | 广东美的暖通设备有限公司 | Rectification inverter circuit component and frequency converter |
| CN213027876U (en) * | 2020-09-29 | 2021-04-20 | 上海大郡动力控制技术有限公司 | Main loop arrangement structure of three-phase alternating current motor driving system controller |
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