CN-122001237-A - Motor controller, power system and vehicle

Abstract

The application provides a motor controller, a power system and a vehicle, and relates to the technical field of motors, wherein the motor controller comprises a direct current bus capacitor unit, a first capacitor and a second capacitor, wherein the direct current bus capacitor unit comprises a first capacitor and a second capacitor which are mutually connected in series, and the first capacitor and the second capacitor are adjacent and at least partially oppositely arranged; the first connecting row assembly is used for connecting the first capacitor and the second capacitor in series; and the power unit is electrically connected with the first connection row assembly. The motor controller can reduce the internal noise of the motor controller, improve the working efficiency of the system and reduce the type selection cost of the bus capacitor and the power module.

Inventors

• QIN XIUJING
• ZHOU YUNLONG
• LIU CHANG
• WANG LONG

Assignees

• 苏州汇川联合动力系统股份有限公司

Dates

Publication Date

20260508

Application Date

20250620

Claims (20)

1. 1. A motor controller, comprising: A dc bus capacitor unit comprising: a first capacitor and a second capacitor connected in series with each other, the first capacitor and the second capacitor being adjacent and at least partially oppositely disposed; The first connecting row assembly is used for connecting the first capacitor and the second capacitor in series; And the power unit is electrically connected with the first connection row assembly.
2. 2. The motor controller of claim 1, wherein the first connection bank assembly comprises: the first positive row is connected with the positive electrode of the first capacitor; The first middle row is respectively connected with the middle pole of the first capacitor and the middle pole of the second capacitor; the first negative row is connected with the negative electrode of the second capacitor; The first positive row, the first middle row and the first negative row are respectively provided with a first terminal, a plurality of first terminals are overlapped to form a first pair of external terminals, and the first pair of external terminals are electrically connected with the power unit.
3. 3. The motor controller of claim 2 wherein the first capacitor and the second capacitor are disposed side-by-side and opposite one another along a first direction.
4. 4. A motor controller according to claim 3, wherein the intermediate pole of the first capacitor and the intermediate pole of the second capacitor are respectively located on different sides of each in a third direction, the third direction being perpendicular to the first direction; the first middle row comprises a first middle connecting part and a second middle connecting part, the first middle connecting part is connected with the middle pole of the first capacitor and overlapped with the first negative row, and the second middle connecting part is connected with the middle pole of the second capacitor and overlapped with the first positive row.
5. 5. A motor controller according to claim 3, wherein a plurality of the first terminals are superimposed on a side of the second capacitor facing away from the first capacitor in the second direction to form the first pair of external terminals.
6. 6. The motor controller according to claim 2, wherein the first capacitor and the second capacitor are disposed side by side and opposite each other in the second direction, The second direction is perpendicular to the first direction.
7. 7. The motor controller of claim 6 wherein the intermediate pole of the first capacitor and the intermediate pole of the second capacitor are each located on a different side of each in a third direction; The first middle row comprises a first middle connecting part and a second middle connecting part, the first middle connecting part is connected with the middle pole of the first capacitor and overlapped with the first negative row, and the second middle connecting part is connected with the middle pole of the second capacitor and overlapped with the first positive row.
8. 8. The motor controller of claim 7 wherein a plurality of the first terminals are stacked on a side of the second capacitor facing away from the first capacitor in a second direction to form the first pair of external terminals.
9. 9. The motor controller of claim 6 wherein the intermediate pole of the first capacitor and the intermediate pole of the second capacitor are each located on the same side of each in a third direction; The first negative row comprises a negative row main body part and a first negative electrode connecting part, wherein the negative row main body part and the first negative electrode connecting part are respectively positioned at two sides of the direct current bus capacitor unit along a third direction; The first middle row comprises a first middle connecting part and a second middle connecting part, the first middle connecting part is connected with the middle pole of the first capacitor and is overlapped with the main body part of the negative row, and the second middle connecting part is connected with the middle pole of the second capacitor and is overlapped with the main body part of the negative row; The first negative electrode connecting portion is connected with a negative electrode of the second capacitor and is arranged side by side with the first positive row along the second direction.
10. 10. The motor controller of claim 9 wherein a plurality of the first terminals are stacked between the first capacitor and the second capacitor to form the first pair of external terminals.
11. 11. The motor controller according to claim 2, wherein the first capacitor and the second capacitor are arranged in a third direction and are disposed opposite to each other, The third direction, the second direction and the first direction are perpendicular to each other.
12. 12. The motor controller of claim 11 wherein the intermediate pole of the first capacitor and the intermediate pole of the second capacitor are disposed opposite one another in a third direction, the positive pole of the first capacitor and the negative pole of the second capacitor are disposed away from one another in the third direction, The first middle row comprises a first middle connecting part and a second middle connecting part, the first middle connecting part is connected with the middle pole of the first capacitor, and the second middle connecting part is connected with the middle pole of the second capacitor.
13. 13. The motor controller of claim 12 wherein a plurality of the first terminals are stacked between the first capacitor and the second capacitor to form the first pair of external terminals.
14. 14. The motor controller according to any one of claims 3, 6, 11, wherein an intermediate pole of the first capacitor and an intermediate pole of the second capacitor are located on different sides of each in a third direction, respectively; the number of the first middle rows is two, one of the first middle rows is connected with the middle pole of the first capacitor, the other first middle row is connected with the middle pole of the second capacitor, The first terminals of the first positive row, the first negative row, and the two first intermediate rows are superimposed between the first capacitor and the second capacitor.
15. 15. The motor controller according to any one of claims 1 to 12, wherein a pitch at which the first capacitor and the second capacitor are staggered in a direction perpendicular to the arrangement direction is 0 to 15mm.
16. 16. The motor controller according to any one of claims 2 to 13, wherein the dc bus capacitor unit further comprises: And the positive electrode of the third capacitor is connected with the first positive row, and the negative electrode of the third capacitor is connected with the first negative row, so that the third capacitor is connected with the branch where the first capacitor and the second capacitor are located in parallel.
17. 17. The motor controller of claim 16 wherein the third capacitor is disposed on the same side of the first and second capacitors or on a side of one of the first and second capacitors remote from the other.
18. 18. The motor controller according to any one of claims 2-13, wherein the power unit comprises: A power module; the second connecting row assembly is used for being electrically connected with the first connecting row assembly; And the three-phase output assembly is used for being connected with the motor.
19. 19. The motor controller of claim 18 wherein the power module is stacked and disposed opposite the dc bus capacitor unit in a third direction or the power module is disposed side-by-side along a second direction; and the second connection row assembly is arranged on one side of the power module, which faces the first pair of external terminals of the first connection row assembly.
20. 20. The motor controller of claim 19 wherein the three-phase output assembly and the second connecting row assembly are disposed on opposite sides of the power module in a second direction.

Description

Motor controller, power system and vehicle Technical Field The application relates to the technical field of motors, in particular to a motor controller, a power system and a vehicle. Background The application of the three-level power topology in the electric drive system of the new energy vehicle can improve the working efficiency of the motor controller, the motor and the electric drive system. At present, most of motor controllers adopting three-level power topology are designed, the influence of factors such as the size and shape of a bus capacitor, the position of an interface of the bus capacitor and a power module on interconnection and switching of the power module and the bus capacitor is not fully considered, so that stray inductance of a power conversion loop is larger, the stray inductance is often the main reason for influencing efficiency deviation between actual test and theoretical/simulation analysis of the three-level power topology, larger turn-off stress is possibly generated when the power module is switched, and the bus capacitor and the power module are higher in type selection cost. Disclosure of Invention In view of the above problems, the application provides a motor controller, a power system and a vehicle, which can reduce the internal noise of the motor controller, improve the working efficiency of the system and reduce the type selection cost of a bus capacitor and a power module. In a first aspect, the application provides a motor controller, which comprises a direct current bus capacitor unit, a first connecting row assembly and a power unit, wherein the direct current bus capacitor unit comprises a first capacitor and a second capacitor which are connected in series, the first capacitor and the second capacitor are adjacent and at least partially oppositely arranged, the first connecting row assembly is used for connecting the first capacitor and the second capacitor in series, and the power unit is electrically connected with the first connecting row assembly. In some embodiments, the first connection row assembly comprises a first positive row connected with the positive electrode of the first capacitor, a first middle row connected with the middle electrode of the first capacitor and the middle electrode of the second capacitor respectively, a first negative row connected with the negative electrode of the second capacitor, and first terminals respectively arranged on the first positive row, the first middle row and the first negative row, wherein a plurality of first terminals are overlapped to form a first pair of external terminals, and the first pair of external terminals are electrically connected with the power unit. In some embodiments, the first capacitor and the second capacitor are disposed side-by-side and opposite along a first direction. In some embodiments, the intermediate pole of the first capacitor and the intermediate pole of the second capacitor are respectively located at different sides along a third direction, the third direction is perpendicular to the first direction, the first intermediate row comprises a first intermediate connection part and a second intermediate connection part, the first intermediate connection part is connected with the intermediate pole of the first capacitor and overlapped with the first negative row, and the second intermediate connection part is connected with the intermediate pole of the second capacitor and overlapped with the first positive row. In some embodiments, the plurality of first terminals are stacked on a side of the second capacitor facing away from the first capacitor in the second direction to form the first pair of external terminals. In some embodiments, the first capacitor and the second capacitor are disposed side by side and opposite along a second direction, the second direction being perpendicular to the first direction. In some embodiments, the intermediate pole of the first capacitor and the intermediate pole of the second capacitor are respectively located at different sides along the third direction, the first intermediate row comprises a first intermediate connection part and a second intermediate connection part, the first intermediate connection part is connected with the intermediate pole of the first capacitor and overlapped with the first negative row, and the second intermediate connection part is connected with the intermediate pole of the second capacitor and overlapped with the first positive row. In some embodiments, the plurality of first terminals are stacked on a side of the second capacitor facing away from the first capacitor in the second direction to form the first pair of external terminals. In some embodiments, the middle pole of the first capacitor and the middle pole of the second capacitor are respectively located on the same side along the third direction, the first negative row comprises a negative row main body part and a first negative electrode connecting part, the n