CN213879689U

CN213879689U - Capacitor assembly and motor controller using same

Info

Publication number: CN213879689U
Application number: CN202022725425.2U
Authority: CN
Inventors: 聂苏
Original assignee: HASCO Magna Electric Drive System Co Ltd
Current assignee: HASCO Magna Electric Drive System Co Ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-08-03
Anticipated expiration: 2030-11-23

Abstract

The utility model discloses a capacitor module and use motor controller of this capacitor module, bus-bar capacitance and filtering Y electric capacity to current motor controller need pass through the screw respectively with IGBT or weld the equipment together, it is big to cause the technology processing degree of difficulty, and parasitic parameter is like contact resistance, thereby make the parasitic stray inductance quality control uniformity of loop and the more complicated problem of homogeneity, with bus-bar capacitance, the female row of direct current is integrated in the capacitor box with filtering Y electric capacity, make motor controller reduce the process when the installation, the processing degree of difficulty is reduced, the process quality is improved. The filtering Y capacitor is integrated in the capacitor shell and close to the IGBT power module, so that the noise loop area of the motor controller is reduced, noise is reduced, and the motor controller is favorable for inhibiting common-mode interference.

Description

Capacitor assembly and motor controller using same

Technical Field

The utility model belongs to the technical field of car motor control, especially, relate to an electric capacity subassembly and use electric capacity subassembly's machine controller.

Background

The three electricity of the new energy electric automobile is as follows: the power battery, the driving motor and the whole vehicle are electrically controlled. The motor controller is a nerve center which is connected with the driving motor and the power battery and used for adjusting and calibrating various performances of the whole vehicle, and the electric control which is intelligent enough can not only ensure the basic safety and the accurate control of the vehicle, but also ensure the battery and the motor to exert sufficient strength.

The core of the motor controller is the control of the driving motor. Vehicle power provider-a power battery that provides direct current, while the driving motor requires three-phase alternating current. Therefore, what the motor controller needs to realize is a process called inversion in power electronics technology, that is, direct current at the power battery end is converted into alternating current at the input side of the motor.

In order to realize the inversion process, the motor controller needs components such as a direct current bus capacitor and an IGBT to work together. After the current is output from the power battery end, the current firstly needs to pass through a direct current bus capacitor to eliminate harmonic components; then, through controlling the on-off of the IGBT and the cooperation of other control units, the direct current is finally inverted into alternating current and is used as the input current of the power motor. The motor controller finally realizes the control of the motor by controlling the frequency of three input currents of the power motor and matching with the feedback values of the speed sensor and the temperature sensor on the power motor.

Generally, a bus capacitor and a filter Y capacitor in a motor controller need to be assembled with an IGBT through screws or welding respectively, which causes a large difficulty in processing, and parasitic parameters such as contact resistance, thereby making quality control consistency and uniformity of a loop parasitic stray inductance complicated.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a capacitor assembly and a motor controller using the capacitor assembly, which integrates Y capacitor in the capacitor shell to be close to an IGBT power module, on one hand, the working procedures are reduced, and the process quality is improved; on the other hand, noise is reduced, and common mode interference is restrained.

In order to solve the above problem, the technical scheme of the utility model is that:

a capacitor assembly is used for a motor controller and comprises a capacitor shell, a bus capacitor, a direct current bus and a filtering Y capacitor, wherein the bus capacitor, the direct current bus and the filtering Y capacitor are integrated in the capacitor shell;

the direct-current busbar is connected with the glue filling surface of the bus capacitor, and the filtering Y capacitor is electrically connected with the direct-current busbar and the grounding wire respectively.

According to an embodiment of the present invention, a row of connecting terminals is disposed on the glue filling surface of the bus capacitor, and the dc bus bar is formed by connecting a first row of connecting terminals and a second row of connecting terminals in parallel;

the first row of connecting terminals are welded with the connecting terminals of the bus capacitor; the second row of connecting terminals are located outside the capacitor shell and used for connecting other devices in the motor controller.

According to the utility model discloses an embodiment, female second row of connecting terminal of arranging of direct current includes eight connecting terminals, and wherein six connecting terminals are used for connecting IGBT power module's in the machine controller input, two remaining connecting terminals are used for connecting the output of EMC filtering board.

According to the utility model discloses an embodiment, filtering Y electric capacity integrated in the electric capacity casing to be close to IGBT power module's link.

A motor controller comprising:

the capacitor assembly of the motor controller in an embodiment of the present invention;

the input end of the IGBT power module is electrically connected with part of second row connecting terminals in a direct current bus row in the capacitor assembly;

the output end of the EMC filter board is electrically connected with part of the second row of connecting terminals in the direct current bus in the capacitor assembly;

the main control board is respectively electrically connected with the IGBT power module and the EMC filter board.

The utility model discloses owing to adopt above technical scheme, make it compare with prior art and have following advantage and positive effect:

1) the utility model relates to an embodiment of a capacitor assembly, be used for machine controller, bus-bar capacitance and filtering Y electric capacity to current machine controller need pass through the screw respectively with IGBT or weld the equipment together, it is big to cause the technology processing degree of difficulty, and parasitic parameter is like contact resistance, thereby make the parasitic stray inductance quality control uniformity of loop and the more complicated problem of homogeneity, with bus-bar capacitance, the female integration in the capacitor box of arranging of direct current and filtering Y electric capacity, make machine controller reduce the process when the installation, the processing degree of difficulty has been reduced, the process quality is improved.

2) The utility model relates to an embodiment's electric capacity subassembly is close to IGBT power module with filtering Y electric capacity integration in the electric capacity casing, has reduced noise loop area to reduce the noise, be favorable to machine controller to restrain common mode interference.

Drawings

Fig. 1 is a block diagram of a capacitor module according to an embodiment of the present invention;

fig. 2 is an EMC simulation comparison diagram of the front and rear integrated Y capacitors in an embodiment of the present invention;

fig. 3 is a block diagram of a motor controller according to an embodiment of the present invention.

Description of reference numerals:

1: a capacitor case; 2: a bus capacitor; 3: a filtering Y capacitor; 4: a direct current bus bar; 401 to 406: a short connection terminal; 407-408: a long connection terminal.

Detailed Description

The following describes a capacitor module and a motor controller using the capacitor module in further detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the following description and appended claims.

The embodiment provides a capacitor assembly for a motor controller. Referring to fig. 1, the capacitor assembly includes a capacitor case 1, a bus capacitor 2, a dc bus 4 and a filter Y capacitor 3. The bus capacitor 2, the direct-current bus bar 4 and the filtering Y capacitor 3 are integrated in the capacitor shell 1.

In the embodiment, the bus capacitor 2, the direct-current bus 4 and the filtering Y capacitor 3 are integrated in the capacitor shell, so that the bus capacitor 2 and the filtering Y capacitor 3 are respectively assembled with the IGBT power module by screws or welding, and are directly connected with the IGBT power module by the connecting terminal of the capacitor assembly instead, on one hand, the working procedures are reduced, and the process quality is improved; on the other hand, the cost is reduced, and the vibration and impact resistance is improved.

Specifically, the direct-current busbar 4 is connected with the glue filling surface of the bus capacitor 2, and the filtering Y capacitor 3 is respectively electrically connected with the direct-current busbar 4 and the grounding wire.

The direct-current busbar 4 is connected with the glue filling surface of the bus capacitor 2, and the method can be realized by the following steps: a row of connecting terminals are arranged on the glue pouring surface of the bus capacitor 2, and the direct-current bus 4 is formed by connecting a first row of connecting terminals and a second row of connecting terminals in parallel; the first row of connecting terminals are welded with the connecting terminals of the bus capacitor 2; and a second row of connecting terminals of the capacitor extends out of the capacitor shell 1 and is used for connecting other devices in the motor controller.

The second row of connecting terminals of the direct-current busbar 4 comprise eight connecting terminals, wherein six connecting terminals are used for connecting input ends of IGBT power modules in a motor controller, namely short connecting terminals 401-406 in fig. 1; the remaining two connection terminals are used to connect the output terminals of the EMC filter board, i.e., the

long connection terminals

407 and 408 in fig. 1.

In order to reduce the noise loop area in the motor controller and reduce noise, the filtering Y capacitor 3 is integrated in the capacitor case 1 and is close to the connection end of the IGBT power module in this embodiment, so that the common mode noise caused by the switch of the IGBT power module is reduced, and the EMI (electromagnetic interference) performance of the motor controller is facilitated.

As shown in fig. 2, before and after the bus capacitor and the filter Y capacitor are integrated, EMC (electromagnetic compatibility) simulation is performed, where black is conducted radiation noise after the filter Y capacitor is integrated, and gray is conducted radiation noise of the non-integrated filter Y capacitor. It can be seen that the conducted radiation noise after the Y capacitor is integrated and filtered is attenuated to some extent at the frequency of more than 1M Hz, which is beneficial to the motor controller to restrain the common mode interference.

Since the capacitor assembly is used for a motor controller, the present embodiment further provides a motor controller, please refer to fig. 3, where the motor controller includes:

the capacitor assembly described above;

the output end of the EMC filter plate is electrically connected with part of the second row of connecting terminals in the direct current bus in the capacitor assembly;

and the main control board is respectively and electrically connected with the IGBT power module and the EMC filter board.

In the embodiment, the motor controller integrates the filtering Y capacitor in the capacitor assembly and is close to the IGBT power module, so that the noise loop area of the motor controller is reduced, noise is reduced, and the motor controller is favorable for suppressing common-mode interference.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, the changes are still within the scope of the present invention if they fall within the scope of the claims and their equivalents.

Claims

1. A capacitor assembly is used for a motor controller and is characterized by comprising a capacitor shell, a bus capacitor, a direct current bus and a filtering Y capacitor, wherein the bus capacitor, the direct current bus and the filtering Y capacitor are integrated in the capacitor shell;

2. The capacitor assembly according to claim 1, wherein a row of connecting terminals is arranged on the glue filling surface of the bus capacitor, and the direct-current bus is formed by connecting a first row of connecting terminals and a second row of connecting terminals in parallel;

3. The capacitor assembly of claim 2, wherein the second row of connection terminals of the dc bus bar comprises eight connection terminals, six of which are used to connect the input terminals of the IGBT power modules in the motor controller, and the remaining two of which are used to connect the output terminals of the EMC filter board.

4. The capacitor assembly of claim 3, wherein the filter Y capacitor is integrated within the capacitor housing proximate the connection terminals of the IGBT power module.

5. A motor controller, comprising:

the capacitive assembly of any one of claims 1 to 4;