Motor inverter
阅读说明:本技术 电机逆变器 (Motor inverter ) 是由 陈恺达 姚通 刘文俊 王震宇 于 2019-03-15 设计创作,主要内容包括:一种电机逆变器,用以与电动发动机相配合,所述电机逆变器包括:直流电容器,呈矩形方体且包括顶面、底面及四个侧面,所述侧面包括一个第一侧面及三个第二侧面;晶体管组,设有三组且分别排列设置于第二侧面上,相邻两个晶体管组之间相互垂直;高压接头,靠近所述第一侧面设置且与所述直流电容器相连接;异步电机,与所述直流电容器相连接。因此,本发明中的直流晶体管组位于所述直流电容器的三个第二侧面上,并且相邻的两个直流电容器之间成直角。而高压接头位于直流电容器的第一侧面上,这样的电学分布结构紧凑,三相之间相互垂直,因而能量密度高、电学性能好、电磁干扰小,并且三相电学平衡性好,效率也更高。(A motor inverter for cooperation with an electric motor, the motor inverter comprising: the direct current capacitor is in a rectangular cuboid shape and comprises a top surface, a bottom surface and four side surfaces, wherein the side surfaces comprise a first side surface and three second side surfaces; three groups of transistor groups are arranged on the second side surface respectively, and two adjacent transistor groups are vertical to each other; the high-voltage connector is arranged close to the first side face and is connected with the direct-current capacitor; and the asynchronous motor is connected with the direct current capacitor. Therefore, the dc transistor groups in the present invention are located on the three second sides of the dc capacitors, and the adjacent two dc capacitors are at right angles therebetween. And the high-voltage connector is positioned on the first side surface of the direct-current capacitor, so that the electric distribution structure is compact, the three phases are vertical to each other, the energy density is high, the electric performance is good, the electromagnetic interference is small, the three-phase electric balance is good, and the efficiency is higher.)
1. A motor inverter for cooperation with an electric motor, the motor inverter comprising:
the direct current capacitor is in a rectangular cuboid shape and comprises a top surface, a bottom surface and four side surfaces, wherein the side surfaces comprise a first side surface and three second side surfaces;
three groups of transistor groups are arranged on the second side surface respectively, and two adjacent transistor groups are vertical to each other;
the high-voltage connector is arranged close to the first side face and is connected with the direct-current capacitor;
and the asynchronous motor is connected with the direct current capacitor.
2. The motor inverter of claim 1, wherein the transistor group comprises bipolar transistors arranged in series, and the dc capacitor comprises:
the positive electrode bus board comprises a positive electrode connecting end and a positive electrode wiring end, the positive electrode connecting end is close to the first side face and is connected with the high-voltage connector, and the positive electrode wiring ends are arranged close to the second side face and are connected with the bipolar transistor;
the negative electrode wiring board comprises a negative electrode connecting end and a negative electrode wiring end, the negative electrode connecting end is connected with the high-voltage connector, and the negative electrode wiring end is connected with the bipolar transistor;
the phase-level junction boards are arranged at intervals, each phase-level junction board comprises a phase-level connection end and a phase-level wiring end, the phase-level connection ends are connected with the asynchronous motor, and the phase-level wiring ends are connected with the bipolar transistors.
3. The motor inverter of claim 2, the positive connection end having a thickness greater than a thickness of the positive terminal, the negative connection end having a thickness greater than a thickness of the negative terminal, the phase connection end having a thickness greater than a thickness of the phase terminal.
4. The motor inverter according to claim 2, wherein the dc capacitor includes a housing, a first receiving space is formed in the housing, the positive bus bar and the negative bus bar are partially disposed in the first receiving space, and the phase bus bar is disposed outside the receiving space and on the upper side of the negative bus bar.
5. The motor inverter of claim 2, the positive bus bar including a positive body bent along an inner surface of the housing, the positive connection end and the positive terminal being disposed on the positive body;
the negative electrode wiring board comprises a square negative electrode main body and a negative electrode terminal seat extending from three sides of the negative electrode main body, and the negative electrode wiring terminal is arranged on the negative electrode terminal seat;
the phase pole bus board comprises a phase pole main body and a phase pole terminal base extending from the phase pole main body, and the phase pole wiring terminal is arranged on the phase pole terminal base;
the motor inverter further includes an insulating layer disposed between the phase terminal block and the negative terminal block.
6. The motor inverter according to claim 5, wherein the positive electrode body is formed by bending along an inner surface of the case, the negative electrode body is plate-shaped and covers the positive electrode body, and a second receiving space is formed between the negative electrode body and the positive electrode body; the direct current capacitor further comprises a plurality of thin film capacitor units, and the thin film capacitor units are arranged in the second accommodating space.
7. The motor inverter of claim 2, further comprising two Y capacitors, the Y capacitors being disposed proximate the first side; and the positive connecting end and the negative connecting end are respectively connected with the two Y capacitors.
8. The motor inverter of claim 7, the positive connection end comprising a positive wide end and a positive narrow end extending from the positive wide end, the negative connection end comprising a negative wide end and a negative narrow end extending from the negative wide section; the positive wide end and the negative wide end are connected with the high-voltage connector, and the negative wide end and the negative narrow end are respectively connected with the two Y capacitors.
9. The motor inverter of claim 2, the transistor stack comprising a strip-shaped heat sink, the bipolar transistors being symmetrically attached to opposite sides of the heat sink.
10. The motor inverter according to claim 9, further comprising a discharge resistor disposed at an end of the heat sink and disposed proximate to the first side.
Technical Field
The present invention relates to a motor inverter, and more particularly, to a motor inverter having high power.
Background
An inverter is an electronic device that converts direct current into alternating current using a high-frequency bridge circuit, and its purpose is opposite to that of a rectifier. In the existing electric vehicle, the inverter is also generally used for controlling the motor of the vehicle and providing power for the operation of the vehicle.
However, the arrangement of capacitors, transistors, etc. in the conventional inverter is often not too tight, resulting in problems such as too high inductance of the high-frequency circuit, or a reduction in service life due to improper heat transfer.
Therefore, it is necessary to design a motor inverter having a better arrangement structure.
Disclosure of Invention
In order to solve the above problems, the present invention provides a motor inverter for cooperation with an electric motor, the motor inverter including: the direct current capacitor is in a rectangular cuboid shape and comprises a top surface, a bottom surface and four side surfaces, wherein the side surfaces comprise a first side surface and three second side surfaces; three groups of transistor groups are arranged on the second side surface respectively, and two adjacent transistor groups are vertical to each other; the high-voltage connector is arranged close to the first side face and is connected with the direct-current capacitor; and the asynchronous motor is connected with the direct current capacitor.
As a further improvement of the present invention, the transistor group includes bipolar transistors arranged in sequence, and the dc capacitor includes: the positive electrode bus board comprises a positive electrode connecting end and a positive electrode wiring end, the positive electrode connecting end is close to the first side face and is connected with the high-voltage connector, and the positive electrode wiring ends are arranged close to the second side face and are connected with the bipolar transistor; the negative electrode wiring board comprises a negative electrode connecting end and a negative electrode wiring end, the negative electrode connecting end is connected with the high-voltage connector, and the negative electrode wiring end is connected with the bipolar transistor; the phase-level junction boards are arranged at intervals, each phase-level junction board comprises a phase-level connection end and a phase-level wiring end, the phase-level connection ends are connected with the asynchronous motor, and the phase-level wiring ends are connected with the bipolar transistors.
As a further improvement of the present invention, the thickness of the positive electrode connecting end is greater than that of the positive electrode terminal, the thickness of the negative electrode connecting end is greater than that of the negative electrode terminal, and the thickness of the phase connection end is greater than that of the phase terminal.
As a further improvement of the present invention, the dc capacitor includes a housing, a first receiving space is formed in the housing, the positive bus bar and the negative bus bar are both partially disposed in the first receiving space, and the phase bus bar is disposed outside the receiving space and on the upper side of the negative bus bar.
As a further improvement of the present invention, the positive bus bar includes a positive main body formed by bending along an inner surface of the housing, and the positive connection end and the positive terminal are disposed on the positive main body; the negative electrode wiring board comprises a square negative electrode main body and a negative electrode terminal seat extending from three sides of the negative electrode main body, and the negative electrode wiring terminal is arranged on the negative electrode terminal seat; the phase pole bus board comprises a phase pole main body and a phase pole terminal base extending from the phase pole main body, and the phase pole wiring terminal is arranged on the phase pole terminal base; the motor inverter further includes an insulating layer disposed between the phase terminal block and the negative terminal block.
As a further improvement of the present invention, the positive electrode main body is formed by bending along an inner surface of the casing, the negative electrode main body is plate-shaped and covers the positive electrode main body, and a second accommodating space is formed between the negative electrode main body and the positive electrode main body; the direct current capacitor further comprises a plurality of thin film capacitor units, and the thin film capacitor units are arranged in the second accommodating space.
As a further improvement of the present invention, the motor inverter further includes two Y capacitors, and the Y capacitors are disposed near the first side surface; and the positive connecting end and the negative connecting end are respectively connected with the two Y capacitors.
As a further improvement of the invention, the positive electrode connecting end comprises a positive electrode wide end and a positive electrode narrow end bent and extended from the positive electrode wide end, and the negative electrode connecting end comprises a negative electrode wide end and a negative electrode narrow end bent and extended from the negative electrode wide section; the positive wide end and the negative wide end are connected with the high-voltage connector, and the negative wide end and the negative narrow end are respectively connected with the two Y capacitors.
As a further improvement of the present invention, the transistor group includes a strip-shaped heat sink, and the bipolar transistors are symmetrically attached to two opposite sides of the heat sink.
As a further improvement of the present invention, the motor inverter further includes a discharge resistor disposed at an end of the heat sink and disposed near the first side surface.
The invention has the beneficial effects that: the direct current transistor groups are positioned on three second sides of the direct current capacitors, and a right angle is formed between two adjacent direct current capacitors. And the high-voltage connector is positioned on the first side surface of the direct-current capacitor, so that the electric distribution structure is compact, the three phases are vertical to each other, the energy density is high, the electric performance is good, the electromagnetic interference is small, the three-phase electric balance is good, and the efficiency is higher.
Drawings
Fig. 1 is a schematic perspective view of a motor inverter according to the present invention;
FIG. 2 is a schematic perspective view of the DC capacitor of the present invention at one angle;
FIG. 3 is a schematic perspective view of a DC capacitor according to another embodiment of the present invention;
FIG. 4 is an enlarged schematic view of the circled portion in FIG. 3;
FIG. 5 is a schematic perspective view of a transistor array according to the present invention;
fig. 6 is a schematic perspective view of the positive electrode bus bar according to the present invention;
fig. 7 is a schematic perspective view of a negative electrode bus bar according to the present invention;
fig. 8 is a schematic perspective view of a phase bus plate according to the present invention;
fig. 9 is a schematic perspective view of a housing of the dc capacitor of the present invention;
fig. 10 is a schematic perspective view of a support plate in the dc capacitor of the present invention.
100-a motor inverter; 10-a direct current capacitor; 1-a shell; 11-a first side; 12-a second side; 13-a first housing space; 14-a support plate; 141-a cross beam; 142-a first blind hole; 143-second blind hole; 2-positive pole bus plate; 21-a positive electrode body; 211-a first base plate; 212-a first side panel; 213-a first capacitance connection plate; 22-positive electrode connecting end; 221-positive wide end; 222-positive pole narrow end; 23-positive terminal; 3-negative pole bus board; 31-a negative body; 32-negative terminal base; 321-negative terminal; 33-a second capacitive connecting plate; 34-a negative electrode connection end; 341-negative wide end; 342-negative narrow end; 4-phase pole bus plate; 41-phase body; 42-phase terminal base; 421-phase terminal; 43-phase pole connection end; 70-transistor group; 90-drive circuit board; 71-a heat sink; 72-a bipolar transistor; 81-discharge resistance.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Moreover, repeated reference numerals or designations may be used in various embodiments. These iterations are merely for simplicity and clarity of describing the present invention, and are not intended to represent any correlation between the different embodiments or configurations discussed.
As shown in fig. 1 to 10, the present invention provides a
the
three groups of
the high-voltage connector is arranged close to the
an asynchronous motor (not shown) is connected to the
The
Therefore, as shown in fig. 1 and fig. 2, the
For convenience of description, the direction of the
As shown in fig. 5, the
As shown in fig. 3 to 4, the
The
As shown in fig. 9, a case 1 is formed of epoxy resin and has a substantially rectangular square shape, the case 1 constitutes a housing of the
As shown in fig. 6, the positive
The positive connection end 22 includes a positive
In the positive
As shown in fig. 7, in the
The negative connection terminal 34 includes a negative wide end 341 extending forward from the second capacitor connection plate 33 and a negative narrow end 342 bent forward from the negative wide end 341, and the negative narrow end 342 is bent horizontally and outwardly and then extends forward. The negative narrow end 342 extends in a horizontal direction opposite to the positive
In the negative
When the
As shown in fig. 8, three
The phase-
Three phases of the three-phase asynchronous motor respectively correspond to the three phase
As shown in fig. 10, the
The support plate 14 is fixed in the housing 1, and thus can support not only the
Therefore, the
As shown in fig. 3 to 4, the
The
Therefore, in summary, the
It should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art will be able to make the description as a whole, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The above detailed description is merely illustrative of possible embodiments of the present invention and is not intended to limit the scope of the invention, which is intended to include all equivalent embodiments or modifications within the scope of the present invention without departing from the technical spirit of the present invention.
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