Motor controller and integrated filtering structure thereof

Abstract

The utility model provides an integrated filtering structure used for a motor controller, a front-stage filtering capacitor is integrated on a PCB board card, and a rear-stage filtering capacitor is fixedly installed on a plastic housing. The PCB card comprises a positive power taking point and a negative power taking point, a control circuit of the PCB card and the pre-stage filter capacitor form a circuit extension structure, and the positive power taking point and the negative power taking point are arranged at the two ends of the circuit extension structure, so that the current entering through the positive power taking point flows through the control circuit and the pre-stage filter capacitor and then flows through the pre-stage filter capacitor, and the current enters the pre-stage filter capacitor. And the current flows out from the negative electricity-taking point. The DC positive electrode copper bar is electrically connected with the positive electricity taking point, and the DC negative electrode copper bar is electrically connected with the negative electricity taking point; and the DC copper bar is also electrically connected with the post-stage filter capacitor and the magnetic ring. The auxiliary electricity positive wire harness is electrically connected with the positive electricity taking point, and the auxiliary electricity negative wire harness is electrically connected with the negative electricity taking point; therefore, the power module assembly and the auxiliary electric load are subjected to a bidirectional filtering process of power input and power output.

Description

Technical Field

[0001] The utility model relates to the technical field of motor controllers, in particular to a motor controller and an integrated filter structure thereof. Background Art

[0002] The filter components of the motor controller of the prior art usually include structures such as capacitors, magnetic rings, and copper bars. The size of the filter components is difficult to control due to the volume occupied by the capacitors, magnetic rings, and copper bars, which often results in a larger size of the motor controller and a low degree of integration of internal parts. For example, the PCB board of the filter component of the prior art is provided with multiple power supply locations, and no filter capacitor is integrated. In addition, the magnetic ring is fixed by the upper cover of the motor controller, and the stability is poor. Summary of the invention

[0003] In order to overcome the above technical defects, the purpose of the utility model is to provide a motor controller with a compact structure and an integrated filter structure thereof.

[0004] The utility model discloses an integrated filter structure for a motor controller, comprising: a filter capacitor, wherein the filter capacitor comprises a front-stage filter capacitor for receiving a current signal in front of a magnetic ring, and a rear-stage filter capacitor for receiving a current signal behind the magnetic ring, wherein the front-stage filter capacitor is integrated on a PCB board, and the rear-stage filter capacitor is fixedly mounted on a plastic shell, wherein the plastic shell is fixedly connected to the housing of the motor controller; the PCB board comprises a positive power-taking point and a negative power-taking point, wherein a control circuit of the PCB board and the front-stage filter capacitor form a filter circuit topology structure, wherein the positive power-taking point and the negative power-taking point are arranged at two ends of the circuit topology structure, so that the current entering through the positive power-taking point flows through the control circuit. The power flows out from the negative power-taking point after passing through the control circuit and the front-stage filter capacitor; a DC copper busbar is used to connect the busbar of the power module assembly of the motor controller, including a DC positive copper busbar and a DC negative copper busbar, the DC positive copper busbar is electrically connected to the positive power-taking point, and the DC negative copper busbar is electrically connected to the negative power-taking point; the DC copper busbar is also electrically connected to the post-stage filter capacitor and the magnetic ring; an auxiliary power harness is used to connect the auxiliary power load, including an auxiliary power positive harness and an auxiliary power negative harness, the auxiliary power positive harness is electrically connected to the positive power-taking point, and the auxiliary power negative harness is electrically connected to the negative power-taking point; so that: the power module assembly and the auxiliary power load undergo a bidirectional filtering process of input and output power.

[0005] Preferably, there are multiple front-stage filter capacitors and multiple rear-stage filter capacitors, multiple front-stage filter capacitors are sequentially integrated on the PCB board, and multiple rear-stage filter capacitors are fixed on the plastic shell by dispensing.

[0006] Preferably, it further comprises a magnetic ring pressing plate, wherein the magnetic ring is arranged on the plastic shell, and the magnetic ring pressing plate is arranged on the upper part of the magnetic ring for fixing the magnetic ring;

[0007] The magnetic ring pressing plate is fixed on the plastic shell by screws.

[0008] Preferably, the magnetic ring pressure plate is in a mesh form.

[0009] Preferably, it also includes an auxiliary power copper busbar exchange seat, and the positive lines of multiple auxiliary power loads are connected to the auxiliary power positive wire harness through the auxiliary power copper busbar exchange seat, so that the positive lines of multiple auxiliary power loads are converged to the auxiliary power positive wire harness; the negative lines of multiple auxiliary power loads are connected to the auxiliary power negative wire harness through the auxiliary power copper busbar exchange seat, so that the negative lines of multiple auxiliary power loads are converged to the auxiliary power negative wire harness.

[0010] Preferably, a fuse is provided between the auxiliary power positive wiring harness and the auxiliary power copper busbar exchange socket.

[0011] Preferably, the PCB board and the auxiliary copper bar exchange seat are respectively arranged at two ends of the plastic shell; the magnetic ring is arranged between the PCB board and the auxiliary copper bar exchange seat;

[0012] The DC copper busbar is connected to the busbar of the power module assembly of the motor controller through a connecting end, and the connecting end is arranged between the PCB board and the auxiliary copper busbar exchange seat;

[0013] The connection end of the DC copper busbar and the auxiliary wire harness are respectively arranged on both sides of the magnetic ring.

[0014] The utility model also discloses a motor controller, including the above-mentioned integrated filtering structure and a power module assembly, wherein the busbar of the power module assembly is connected to the DC copper busbar, so that the power module assembly undergoes a bidirectional filtering process of input and output power.

[0015] Compared with the prior art, the above technical solution has the following beneficial effects:

[0016] 1. Setting the power supply position of the DC copper bus and the auxiliary power load on the PCB board to the same can reduce the number of parts, and allow the auxiliary power load to completely pass the bidirectional filtering process of the entire set of filtering components, thereby improving functional efficiency;

[0017] 2. By integrating the filter capacitor into the PCB board and connecting it to the filter copper bus, the capacitor wiring length is close to 0mm, reducing the inductance of the filter capacitor caused by the long wiring;

[0018] 3. By providing the magnetic ring pressure plate, the stability of the magnetic ring fixation is improved;

[0019] 4. By setting up the auxiliary copper busbar exchange seat, the overall occupied space is reduced and the operable space for assembly is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 An exploded diagram of the integrated filter structure provided by the utility model;

[0021] Figure 2 A top view of the integrated filtering structure provided by the utility model (wherein the magnetic ring cover is shown);

[0022] Figure 3 This is a bottom view of the integrated filtering structure provided by the utility model (wherein a magnetic ring is shown).

[0023] Among them: 1-PCB board, 2-pre-stage filter capacitor, 3-magnetic ring, 4-magnetic ring pressure plate, 5-auxiliary wire harness, 6-DC copper busbar, 7-auxiliary copper busbar exchange seat, 8-plastic shell, 9-post-stage filter capacitor. DETAILED DESCRIPTION

[0024] The advantages of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0026] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0027] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0028] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0030] In the following description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present invention, and they themselves have no specific meaning. Therefore, "module" and "component" can be used interchangeably.

[0031] See attached Figure 1-3 The utility model discloses an integrated filter structure for a motor controller. The filter component of the motor controller is a circuit part used to reduce the electromagnetic interference generated when the motor is running and improve the power quality. The main purpose of these components is to protect the motor and the controller from high-frequency noise and voltage fluctuations, and to ensure the stability and reliability of the motor operation. The main filter components include capacitors, inductors, filter tops, magnetic rings 3, etc. Capacitors are used to smooth voltage fluctuations on the power line and reduce ripples. Inductors are used to suppress high-frequency noise, especially transient currents caused by rapid switching of the motor. The filter top is usually composed of a combination of L (inductor), C (capacitor) or LC (inductor and capacitor) to form a filter circuit. The filter top of the utility model is an LCL (inductor-capacitor-inductor) filter top structure.

[0032] The number of filter capacitors is usually more than one. In the filter circuit structure, it includes a front-stage filter capacitor 2 located in front of the magnetic ring 3 and used for the front magnetic ring 3 to receive the current signal, and a rear-stage filter capacitor 9 located in the rear of the magnetic ring 3 and used for the rear magnetic ring 3 to receive the current signal. The utility model integrates all the front-stage filter capacitors 2 on the PCB board 1, and the rear-stage filter capacitor 9 is fixedly installed on the plastic shell 8, and the plastic shell 8 is fixedly connected to the housing of the motor controller. In the preferred embodiment provided by the utility model, the number of the front-stage filter capacitors 2 is two, and the two front-stage filter capacitors 2 are integrated on the PCB board 1. Compared with leaving space for placing two front-stage filter capacitors 2, integrating them on the PCB board 1 can reduce the occupied space and filtering noise. There are also two post-stage filter capacitors 9, which can be called intermediate filter capacitors and final filter capacitors 9. In the preferred embodiment provided by the utility model, the intermediate filter capacitor is arranged inside the plastic shell 8 (inner surface) and is fixed to the plastic shell 8 by glue injection; the final filter capacitor 9 is arranged outside the plastic shell 8 (outer surface) and is fixed to the plastic shell 8 by glue dispensing.

[0033] The filter component also includes a PCB board 1, which includes a positive power point and a negative power point. The control circuit of the PCB board 1 and the front-stage filter capacitor 2 form a filter circuit topology structure. The positive power point and the negative power point are arranged at both ends of the circuit topology structure, so that the current entering through the positive power point flows through the control circuit and the front-stage filter capacitor 2 and then flows out from the negative power point.

[0034] The DC copper bar 6 is used to connect the filter assembly and the power module assembly of the motor controller, so as to filter the in-and-out current of the power module assembly of the motor controller through the filter assembly. One end of the DC copper bar 6 is connected to the power point of the PCB board 1, and the other end is connected to the busbar of the power module assembly of the motor controller. Specifically, the DC copper bar 6 includes a DC positive copper bar and a DC negative copper bar, the DC positive copper bar is electrically connected to the positive power point, and the DC negative copper bar is electrically connected to the negative power point, so that the DC positive copper bar and the DC negative copper bar are connected to the filter circuit. The DC copper bar 6 is also electrically connected to the post-stage filter capacitor 9 and the magnetic ring 3 to add the post-stage filter capacitor 9 and the magnetic ring 3 into the filtering process.

[0035] The auxiliary wiring harness 5 has one end connected to the power point of the PCB board 1, and the other end connected to the auxiliary power load. The auxiliary power load is usually a PTC heater, air conditioner, radio and other equipment, and its input and output currents also need to be filtered to achieve stable current output. Specifically, the auxiliary wiring harness 5 includes an auxiliary positive wiring harness and an auxiliary negative wiring harness, the auxiliary positive wiring harness is electrically connected to the positive power point, and the auxiliary negative wiring harness is electrically connected to the negative power point, thereby connecting the auxiliary positive wiring harness and the auxiliary negative wiring harness to the filter circuit.

[0036] Therefore, the power supply positions of the DC copper bus 6 and the auxiliary power load on the PCB board 1 are set to the same, which can reduce the number of parts and enable the auxiliary power load to completely pass the bidirectional filtering process of the entire set of filtering components, thereby improving the efficiency of the filtering function.

[0037] A preferred embodiment further includes a magnetic ring pressing plate 4, the magnetic ring 3 is arranged on the plastic shell 8 (or the housing of the motor controller), and the magnetic ring pressing plate 4 is arranged on the upper part of the magnetic ring 3 to fix the magnetic ring 3. The magnetic ring pressing plate 4 is fixed to the plastic shell 8 by screws, and at least three screws can be set to fix the magnetic ring pressing plate 4. Compared with fixing and pressing the magnetic ring 3 by the upper cover of the housing of the motor controller, the number of parts used is reduced, and the fixing stability of the magnetic ring 3 is strengthened.

[0038] Furthermore, the magnetic ring pressure plate 4 is in a mesh form, which saves materials and facilitates heat dissipation.

[0039] A preferred embodiment further includes an auxiliary power copper bar exchange seat 7, and the positive lines of multiple auxiliary power loads are connected to the auxiliary power positive wire harness through the auxiliary power copper bar exchange seat 7, so that the positive lines of multiple auxiliary power loads are converged to the auxiliary power positive wire harness. The negative lines of multiple auxiliary power loads are connected to the auxiliary power negative wire harness through the auxiliary power copper bar exchange seat 7, so that the negative lines of multiple auxiliary power loads are converged to the auxiliary power negative wire harness. For example, the positive lines of PTC heaters, air conditioners, radios, etc. are converged into the same positive line through the auxiliary power copper bar exchange seat 7, that is, the auxiliary power positive wire harness; the negative lines of PTC heaters, air conditioners, radios, etc. are converged into the same negative line through the auxiliary power copper bar exchange seat 7, that is, the auxiliary power negative wire harness.

[0040] Furthermore, a fuse is provided between the auxiliary power positive wiring harness and the auxiliary power copper busbar exchange socket 7. When the current from the auxiliary power loads such as the PTC heater, air conditioner, and radio exceeds the threshold, the fuse blows, so that the large current (impact current) exceeding the threshold will not be transmitted to the PCB board 1, thereby protecting the PCB board 1 and other devices of the filter assembly.

[0041] Preferably, the PCB board 1 and the auxiliary copper busbar exchange seat 7 are respectively arranged at the two ends of the plastic shell 8, and the magnetic ring 3 is arranged between the PCB board 1 and the auxiliary copper busbar exchange seat 7. The DC copper busbar 6 is connected to the busbar of the power module assembly of the motor controller through the connecting end (which can also be understood as the DC outlet end of the filter assembly), and the connecting end (the DC outlet end of the filter assembly) is arranged between the PCB board 1 and the auxiliary copper busbar exchange seat 7. The connecting end of the DC copper busbar 6 (the DC outlet end of the filter assembly) and the auxiliary wire harness 5 are respectively arranged on both sides of the magnetic ring 3. Specifically, the connecting end of the DC copper busbar 6 (the DC outlet end of the filter assembly) is close to the power module assembly of the motor controller, and the auxiliary wire harness 5 is away from the power module assembly of the motor controller and close to the outside of the motor controller, so as to facilitate connection with the external auxiliary power load.

[0042] The utility model also discloses a motor controller, including the above-mentioned integrated filtering structure, and also including a power module assembly, wherein the busbar of the power module assembly is connected to the DC copper busbar 6, so that the input and output of the current of the power module assembly are both subjected to a bidirectional filtering process. It also includes an auxiliary wire harness 5, which is connected to an auxiliary electric load, so that the input and output of the current of the auxiliary electric load are both subjected to a bidirectional filtering process.

[0043] It should be noted that the embodiments of the present invention have better practicability and do not impose any form of limitation on the present invention. Any technician familiar with the field may use the technical content disclosed above to change or modify it into an equivalent effective embodiment. However, any modification or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An integrated filter structure for a motor controller, characterized in that: include: A filter capacitor, wherein the filter capacitor comprises a front-stage filter capacitor for receiving a current signal before the magnetic ring, and a rear-stage filter capacitor for receiving a current signal after the magnetic ring, wherein the front-stage filter capacitor is integrated on a PCB board, and the rear-stage filter capacitor is fixedly mounted on a plastic shell, and the plastic shell is fixedly connected to a housing of the motor controller; A PCB board, comprising a positive power point and a negative power point, wherein the control circuit of the PCB board and the front-stage filter capacitor form a filter circuit topology structure, wherein the positive power point and the negative power point are arranged at two ends of the circuit topology structure, so that the current entering through the positive power point flows through the control circuit and the front-stage filter capacitor and then flows out from the negative power point; A DC copper busbar, used to connect the busbar of the power module assembly of the motor controller, including a DC positive copper busbar and a DC negative copper busbar, wherein the DC positive copper busbar is electrically connected to the positive power point, and the DC negative copper busbar is electrically connected to the negative power point; the DC copper busbar is also electrically connected to the post-stage filter capacitor and the magnetic ring; An auxiliary power harness, used to connect an auxiliary power load, including an auxiliary power positive harness and an auxiliary power negative harness, wherein the auxiliary power positive harness is electrically connected to the positive power-taking point, and the auxiliary power negative harness is electrically connected to the negative power-taking point; The power module assembly and the auxiliary power load undergo a two-way filtering process of input and output power.

2. The integrated filter structure for a motor controller according to claim 1, characterized in that: There are multiple front-stage filter capacitors and multiple rear-stage filter capacitors, and multiple front-stage filter capacitors are sequentially integrated on the PCB board, and multiple rear-stage filter capacitors are fixed on the plastic shell by dispensing.

3. The integrated filter structure for a motor controller according to claim 1, characterized in that: It also includes a magnetic ring pressing plate, the magnetic ring is arranged on the plastic shell, and the magnetic ring pressing plate is arranged on the upper part of the magnetic ring for fixing the magnetic ring; The magnetic ring pressing plate is fixed on the plastic shell by screws.

4. The integrated filter structure for a motor controller according to claim 3, characterized in that: The magnetic ring pressure plate is in a mesh form.

5. The integrated filter structure for a motor controller according to claim 1, characterized in that: It also includes an auxiliary power copper busbar exchange seat, through which the positive lines of the multiple auxiliary power loads are connected to the auxiliary power positive wire harness, thereby converging the positive lines of the multiple auxiliary power loads to the auxiliary power positive wire harness; the negative lines of the multiple auxiliary power loads are connected to the auxiliary power negative wire harness through the auxiliary power copper busbar exchange seat, thereby converging the negative lines of the multiple auxiliary power loads to the auxiliary power negative wire harness.

6. The integrated filter structure for a motor controller according to claim 5, characterized in that: A fuse is provided between the auxiliary power positive wiring harness and the auxiliary power copper bar exchange seat.

7. The integrated filter structure for a motor controller according to claim 5, characterized in that: The PCB board and the auxiliary copper bar exchange seat are respectively arranged at two ends of the plastic shell; the magnetic ring is arranged between the PCB board and the auxiliary copper bar exchange seat; The DC copper busbar is connected to the busbar of the power module assembly of the motor controller through a connecting end, and the connecting end is arranged between the PCB board and the auxiliary copper busbar exchange seat; The connection end of the DC copper busbar and the auxiliary wire harness are respectively arranged on both sides of the magnetic ring.

8. A motor controller, characterized in that: It includes the integrated filtering structure described in any one of claims 1 to 7 above, and also includes a power module assembly, the busbar of the power module assembly is connected to the DC copper busbar, so that the power module assembly undergoes a bidirectional filtering process of input and output power.

Images