Motor controller

Abstract

The utility model relates to the technical field of automobile parts, and provides a motor controller, which comprises a low-voltage port arranged on a control circuit board; the plurality of first copper exposing areas surround the low-voltage port and are distributed on the first surface of the control circuit board; the plurality of second copper exposing areas surround the low-voltage port and are distributed on the second surface of the control circuit board; the plurality of via holes are respectively communicated with the plurality of first exposed copper areas and the plurality of second exposed copper areas; the metal cover is arranged on the first surface of the control circuit board and is in contact with the plurality of first exposed copper areas through a first flexible conductor; and the metal shielding plate is arranged on the second surface of the control circuit board and is in contact with the plurality of second exposed copper areas through a second flexible conductor, and a shielding cavity for accommodating the control circuit board is defined by the metal shielding plate and the metal cover. According to the utility model, effective EMC shielding of a low-voltage port can be realized, the capability of resisting external electromagnetic interference is improved, external leakage caused by internal interference is avoided, the shielding structure is simple in design, and the cost is controllable.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and more specifically, to a motor controller. Background Technology

[0002] The motor controllers of pure electric vehicles, hybrid vehicles, and other similar vehicles are equipped with low-voltage and high-voltage ports. The high-voltage port is used to supply power to the motor windings, while the low-voltage port can be used to obtain information such as motor temperature and motor rotor position.

[0003] Currently, motor controllers only have effective shielding structures for high-voltage ports, while low-voltage ports lack effective EMC (Electromagnetic Compatibility) shielding designs. Current shielding designs for low-voltage ports use upper and lower housings for EMC shielding, but due to the large gaps between these housings and the low-voltage ports, effective EMC shielding is not achieved. Some designs use separate shielding covers for EMC shielding, but these covers are difficult to install and manufacture, resulting in high costs.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this utility model, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] This invention provides a motor controller that can effectively shield the low-voltage port from EMC, improve the ability to resist external electromagnetic interference, and prevent internal interference from leaking to the outside. The shielding structure is simple in design and the cost is controllable.

[0006] According to one aspect of the present invention, a motor controller is provided, including a low-voltage port disposed on a control circuit board, and further comprising: a plurality of first exposed copper areas surrounding the low-voltage port and distributed in a free area on a first surface of the control circuit board; a plurality of second exposed copper areas surrounding the low-voltage port and distributed in a free area on a second surface of the control circuit board, wherein the positions of the plurality of second exposed copper areas correspond to the positions of the plurality of first exposed copper areas; a plurality of vias distributed in the free area of ​​the control circuit board and respectively connecting the plurality of first exposed copper areas and the plurality of second exposed copper areas; a metal cover disposed on the first surface of the control circuit board and in contact with the plurality of first exposed copper areas through a first flexible conductor; and a metal shielding plate disposed on the second surface of the control circuit board and in contact with the plurality of second exposed copper areas through a second flexible conductor, wherein the metal shielding plate and the metal cover form a shielding cavity for accommodating the control circuit board.

[0007] In some embodiments, the metal cover and the control circuit board are fitted with a clearance; the metal cover is provided with a first protrusion, and the first protrusion abuts against the plurality of first exposed copper areas through the first flexible conductor.

[0008] In some embodiments, the first flexible conductor is disposed on the first protrusion, wherein the surface of the first protrusion is provided with a first groove for embedding the first flexible conductor; or, the first flexible conductor is disposed on the first exposed copper area.

[0009] In some embodiments, the metal shielding plate and the control circuit board are gap-fitted; the metal shielding plate is provided with a second protrusion, and the second protrusion abuts against the plurality of second exposed copper areas through the second flexible conductor.

[0010] In some embodiments, the second flexible conductor is disposed on the second protrusion, wherein the surface of the second protrusion is provided with a second groove for embedding the second flexible conductor; or, the second flexible conductor is disposed on the second exposed copper area.

[0011] In some embodiments, the compression of the first flexible conductor and the second flexible conductor is 10% to 30%, and the volume resistivity of the first flexible conductor and the second flexible conductor is less than 40 Ωm.

[0012] In some embodiments, the first flexible conductor and the second flexible conductor are any one of conductive adhesive, conductive foam, and conductive rubber; wherein the conductive filler in the conductive adhesive includes any one of silver and nickel, silver and copper, nickel and carbon, and silver and aluminum, and the conductive filler in the conductive rubber includes any one of silver, silver-plated copper, silver-plated aluminum, silver-plated nickel, silver-plated glass, silver-plated graphite, nickel-plated graphite, and graphite particles.

[0013] In some embodiments, along the horizontal direction of the control circuit board, the distance between adjacent first flexible conductors is less than 2cm, the distance between adjacent second flexible conductors is less than 2cm, and the distance between the first flexible conductor and the second flexible conductor at the edge and the metal cover is less than 2cm; along the vertical direction of the control circuit board, the maximum distance between the metal cover and the metal shielding plate is less than 2cm.

[0014] In some embodiments, the motor controller further includes: a metal housing disposed on the second surface of the control circuit board, the metal housing being assembled with the metal cover to form a receiving cavity for accommodating the control circuit board and the metal shielding plate.

[0015] In some embodiments, the metal shielding plate is fixed to the metal housing by screws; the control circuit board is fixed to the metal shielding plate by screws; and the metal cover is fixed to the metal housing by screws.

[0016] The beneficial effects of this utility model compared with the prior art include at least the following:

[0017] Through vias, a first exposed copper area and a second exposed copper area distributed on two surfaces of the control circuit board surrounding the low-voltage port are connected. The first exposed copper area further contacts a metal cover through a first flexible conductor, and the second exposed copper area further contacts a metal shielding plate through a second flexible conductor. The metal shielding plate and the metal cover form a shielding cavity to accommodate the control circuit board. This achieves an EMC shielding structure design for the low-voltage port, effectively blocking external electromagnetic radiation interference, preventing external interference intrusion, and improving the product's EMS (Electromagnetic Susceptibility) immunity performance. Furthermore, it effectively prevents internal interference from leaking outwards, preventing EMI (Electromagnetic Interference) interference outside the product.

[0018] The exposed copper area is in contact with the metal cover / metal shielding plate through a flexible conductor. On the one hand, the appropriate compression of the flexible conductor ensures stable contact between the exposed copper area and the metal cover / metal shielding plate, and on the other hand, it avoids damaging the control circuit board.

[0019] This invention features a simple and cost-effective shielding structure for low-voltage ports. The motor controller based on this invention is particularly suitable for pure electric vehicles and hybrid vehicles, significantly improving performance through an effective EMC shielding structure design for low-voltage ports.

[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the present invention. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments conforming to the present invention and, together with the description, serve to explain the principles of the present invention. It is obvious that the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0022] Figure 1 The diagram shows a top view of the motor controller in an embodiment of this utility model.

[0023] Figure 2This diagram shows a side sectional view of the motor controller in an embodiment of the present invention.

[0024] Figure 3 The diagram shows a cross-sectional view of the motor controller in an embodiment of this utility model. Detailed Implementation

[0025] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0026] The accompanying drawings are merely illustrative of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar structures, and therefore, repeated descriptions of them will be omitted.

[0027] In the description of this utility model, the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "upper," "lower," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings; they are for ease of description only and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The term "multiple" means two or more, unless otherwise explicitly specified. Furthermore, in the description of this utility model, when it is said that a device is "connected" to another device, this includes not only direct connections but also indirect connections through other elements.

[0028] It should be noted that, unless otherwise specified, the embodiments of this utility model and the features in different embodiments can be combined with each other.

[0029] Figure 1 The diagram illustrates the top view of the motor controller in an embodiment of this utility model. Figure 2 The diagram illustrates a side sectional view of the motor controller in an embodiment of this utility model. Figure 3 The diagram illustrates the front sectional view of the motor controller in an embodiment of this utility model; combined with Figures 1 to 3 As shown, the motor controller provided in this embodiment of the present invention includes:

[0030] The low-voltage port 20 is located on the control circuit board 10;

[0031] Multiple first exposed copper areas 30 are distributed around the low-voltage port 20 in the free area of ​​the first surface of the control circuit board 10.

[0032] Multiple second exposed copper areas 40 surround the low-voltage port 20 and are distributed on the free area of ​​the second surface of the control circuit board 10, and the positions of the multiple second exposed copper areas 40 correspond to the positions of the multiple first exposed copper areas 30.

[0033] Multiple vias 50 are distributed in the free area of ​​the control circuit board 10, respectively connecting multiple first exposed copper areas 30 and multiple second exposed copper areas 40;

[0034] A metal cover 60 is disposed on the first surface of the control circuit board 10 and contacts multiple first exposed copper areas 30 through a first flexible conductor 71.

[0035] A metal shielding plate 80 is disposed on the second surface of the control circuit board 10, and contacts multiple second exposed copper areas 40 through a second flexible conductor 72. The metal shielding plate 80 and the metal cover 60 form a shielding cavity for accommodating the control circuit board 10.

[0036] The control circuit board 10 has a copper-plated surface, and the copper layer is coated with solder mask (or green solder mask). Exposed copper areas can be removed by removing the solder mask. The unused areas of the control circuit board 10 refer to areas on the control circuit board 10 where no other electronic components are mounted. For example, see... Figure 1 The blank area of ​​the control circuit board 10 can be used to place other electronic components, including TVS / ESD transistors, capacitors, resistors, inductors, common-mode inductors, etc. The arrangement and connection relationships of these electronic components are existing technologies, therefore... Figure 1 Not specifically shown in the text, Figure 1 Only the low-voltage port 20 and its shielding structure design are shown in the diagram. It should be noted that... Figure 1 The diagram only shows the first exposed copper area 30 and via 50 on the first surface of the control circuit board 10, and does not show the second exposed copper area, flexible conductors, or other structures. The first surface and the second surface refer to the upper and lower surfaces of the control circuit board 10, respectively. Furthermore, the motor controller may also include structures such as a power circuit board 11.

[0037] In this invention, a first exposed copper area 30 and a second exposed copper area 40, distributed on the upper and lower surfaces of the control circuit board 10, are connected via a through-hole 50. The first exposed copper area 30 further contacts the metal cover 60 via a first flexible conductor 71, and the second exposed copper area 40 further contacts the metal shielding plate 80 via a second flexible conductor 72. The metal shielding plate 80 and the metal cover 60 form a shielding cavity to accommodate the control circuit board 10. This achieves an EMC shielding structure design for the low-voltage port 20, specifically enabling effective EMC shielding at frequencies <1.4GHz. This not only effectively blocks external electromagnetic radiation interference, preventing external interference intrusion and improving the product's EMS immunity, but also effectively prevents internal interference leakage to the outside, preventing EMI interference outside the product.

[0038] The exposed copper area is in contact with the metal cover 60 / metal shielding plate 80 through a flexible conductor. On the one hand, the appropriate compression of the flexible conductor ensures stable contact between the exposed copper area and the metal cover 60 / metal shielding plate 80, and on the other hand, it avoids damaging the control circuit board 10.

[0039] This invention features a simple and cost-effective shielding structure for the low-voltage port 20. The motor controller based on this invention is particularly suitable for pure electric vehicles and hybrid vehicles, significantly improving performance through the effective EMC shielding structure design of the low-voltage port 20.

[0040] In some embodiments, the metal cover 60 is clearance-fitted with the control circuit board 10; the metal cover 60 is provided with a first protrusion 66, which abuts against a plurality of first exposed copper areas 30 via a first flexible conductor 71.

[0041] Furthermore, the first flexible conductor 71 can be disposed on the first protrusion 66. In this case, the surface of the first protrusion 66 can be provided with a first groove for embedding the first flexible conductor 71, so as to facilitate the placement of the first flexible conductor 71. Alternatively, the first flexible conductor 71 can be disposed on the first exposed copper area 30.

[0042] In some embodiments, the metal shielding plate 80 and the control circuit board 10 are fitted with a gap; the metal shielding plate 80 is provided with a second protrusion 88, and the second protrusion 88 abuts against a plurality of second exposed copper areas 40 through a second flexible conductor 72.

[0043] Furthermore, the second flexible conductor 72 can be disposed on the second protrusion 88. In this case, the surface of the second protrusion 88 can be provided with a second groove for embedding the second flexible conductor 72, so as to facilitate the placement of the second flexible conductor 72. Alternatively, the second flexible conductor 72 can be disposed on the second exposed copper area 40.

[0044] In some embodiments, the compression of the first flexible conductor 71 and the second flexible conductor 72 is controlled between 10% and 30% to ensure stable contact between the first exposed copper region 30 and the metal cover 60, and between the second exposed copper region 40 and the metal shielding plate 80. Furthermore, the volume resistivity of the first flexible conductor 71 and the second flexible conductor 72 is less than 40 Ωm to ensure conductivity between the first exposed copper region 30 and the metal cover 60, and between the second exposed copper region 40 and the metal shielding plate 80.

[0045] In some embodiments, the first flexible conductor 71 and the second flexible conductor 72 are each of conductive adhesive, conductive foam, and conductive rubber; wherein the conductive filler in the conductive adhesive includes any one of silver and nickel, silver and copper, nickel and carbon, and silver and aluminum, and the conductive filler in the conductive rubber includes any one of silver, silver-plated copper, silver-plated aluminum, silver-plated nickel, silver-plated glass, silver-plated graphite, nickel-plated graphite, and graphite particles.

[0046] In some embodiments, along the horizontal direction of the control circuit board 10, the distance between adjacent first flexible conductors 71 is less than 2 cm, the distance between adjacent second flexible conductors 72 is less than 2 cm, and the distance between the edge first flexible conductors 71 and edge second flexible conductors 72 and the metal cover 60 is less than 2 cm; thus, the EMC shielding effectiveness of the low-voltage port 20 can be ensured. Furthermore, along the vertical direction of the control circuit board 10, the maximum spacing between the metal cover 60 and the metal shielding plate 80 is less than 2 cm to ensure the EMC shielding effectiveness of the low-voltage port 20.

[0047] Furthermore, in some embodiments, the motor controller further includes a metal housing 90 disposed on the second surface of the control circuit board 10, wherein the metal housing 90 is assembled with the metal cover 60 to form a receiving cavity for accommodating the control circuit board 10 and the metal shielding plate 80.

[0048] The metal shielding plate 80 is fixed to the metal housing 90 by screws 99; the control circuit board 10 is fixed to the metal shielding plate 80 by screws 99; and the metal cover 60 is fixed to the metal housing 90 by screws 99.

[0049] In addition to fixing the components together, screw 99 can also ensure that the metal cover 60 effectively contacts the first exposed copper area 30 through the first flexible conductor 71 and the metal shielding plate 80 effectively contacts the second exposed copper area 40 through the second flexible conductor 72, thus ensuring the effectiveness of EMC shielding of the low-voltage port 20.

[0050] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A motor controller, comprising a low-voltage port disposed on a control circuit board, characterized in that, Also includes: Multiple first exposed copper areas are distributed around the low-voltage port in the free area of ​​the first surface of the control circuit board; Multiple second exposed copper areas are distributed around the low-voltage port in the free area of ​​the second surface of the control circuit board, and the positions of the multiple second exposed copper areas correspond to the positions of the multiple first exposed copper areas; Multiple vias are distributed in the free area of ​​the control circuit board, respectively connecting the multiple first exposed copper areas and the multiple second exposed copper areas; A metal cover is disposed on the first surface of the control circuit board and contacts the plurality of first exposed copper areas through a first flexible conductor. A metal shielding plate is disposed on the second surface of the control circuit board, and contacts the plurality of second exposed copper areas through a second flexible conductor. The metal shielding plate and the metal cover form a shielding cavity for accommodating the control circuit board.

2. The motor controller as described in claim 1, characterized in that, The metal cover and the control circuit board are fitted with a clearance. The metal cover is provided with a first protrusion, which abuts against the plurality of first exposed copper areas via the first flexible conductor.

3. The motor controller as described in claim 2, characterized in that, The first flexible conductor is disposed on the first protrusion, wherein the surface of the first protrusion is provided with a first groove for embedding the first flexible conductor; Alternatively, the first flexible conductor may be disposed on the first exposed copper area.

4. The motor controller as described in claim 1, characterized in that, The metal shielding plate and the control circuit board are fitted with a clearance. The metal shielding plate is provided with a second protrusion, which abuts against the plurality of second exposed copper areas through the second flexible conductor.

5. The motor controller as described in claim 4, characterized in that, The second flexible conductor is disposed on the second protrusion, wherein the surface of the second protrusion is provided with a second groove for embedding the second flexible conductor; Alternatively, the second flexible conductor may be disposed on the second exposed copper area.

6. The motor controller as described in claim 1, characterized in that, The compression of the first flexible conductor and the second flexible conductor is 10% to 30%, respectively, and the volume resistivity of the first flexible conductor and the second flexible conductor is less than 40 Ωm.

7. The motor controller as described in claim 1, characterized in that, The first flexible conductor and the second flexible conductor are each one of conductive adhesive, conductive foam, and conductive rubber; The conductive filler in the conductive adhesive includes any one of silver and nickel, silver and copper, nickel and carbon, and silver and aluminum. The conductive filler in the conductive rubber includes any one of silver, silver-plated copper, silver-plated aluminum, silver-plated nickel, silver-plated glass, silver-plated graphite, nickel-plated graphite, and graphite particles.

8. The motor controller as described in claim 1, characterized in that, Along the horizontal direction of the control circuit board, the distance between adjacent first flexible conductors is less than 2cm, the distance between adjacent second flexible conductors is less than 2cm, and the distance between the first flexible conductor and the second flexible conductor at the edge and the metal cover is less than 2cm. Along the vertical direction of the control circuit board, the maximum distance between the metal cover and the metal shielding plate is less than 2 cm.

9. The motor controller as described in claim 1, characterized in that, Also includes: A metal housing is disposed on the second surface of the control circuit board. The metal housing is assembled with the metal cover to form a cavity for accommodating the control circuit board and the metal shielding plate.

10. The motor controller as described in claim 9, characterized in that, The metal shielding plate is fixed to the metal housing by screws; The control circuit board is fixed to the metal shielding plate by screws; The metal cover is fixed to the metal housing by screws.

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