Controller shell and motor controller

Abstract

The utility model relates to the technical field of motor controllers, in particular to a controller shell and a motor controller. The controller shell comprises a shell body, an upper cover and a plurality of elastic components; the elastic component comprises an elastic piece; the shell comprises a shell body and a shell partition wall, one side of the shell body is open, the shell partition wall is connected with the shell body to divide the interior of the shell body into a plurality of containing spaces, and the upper cover covers one side of the shell body to enable the containing spaces to form a plurality of containing cavities; an assembly gap exists between the shell partition wall and the upper cover, the plurality of elastic components are connected with one of the shell partition wall and the upper cover, an elastic part of each elastic component is arranged in the assembly gap, and the elastic parts are tightly pressed between the shell partition wall and the upper cover. According to the controller shell and the motor controller, the problem that electromagnetic isolation cannot be achieved in the shielding design scheme of an existing motor controller is solved.

Description

Technical Field

[0001] This application relates to the field of motor controller technology, and in particular to a controller housing and a motor controller. Background Technology

[0002] The integration level of motor controllers for new energy vehicles is increasing, evolving from simple inverters to multi-functional devices with a growing number of power electronic components. Simultaneously, the demand for lightweight and miniaturized products has led to increased component density in motor controllers. Electromagnetic compatibility (EMC) issues are becoming increasingly serious, necessitating the use of shielding designs within the motor controller.

[0003] like Figure 11 and Figure 12 As shown, existing shielding designs generally employ cavity shielding isolation. This cavity isolation design uses an integral shell partition 210 inside the shell, creating two spaces within the shell. A single top cover 100 is then placed over the shell, forming two cavities. The shell is cast, and the shell partition 210 is a cast stiffener, designed for both wiring requirements and cost reduction. However, due to machining tolerances and subsequent assembly, a gap exists between the shell partition 210 and the top cover 100, which affects EMC performance.

[0004] As shown in the figure. Figure 11 The diagram illustrates the first assembly method of the housing and the top cover 100. The first assembly method uses a special misalignment design between the top cover 100 and the housing. The housing partition wall 210 and the top cover partition wall 110 are misaligned and there is a misalignment gap between them. There is also a wiring gap between the upper surface of the housing partition wall 210 and the lower surface of the top cover 100.

[0005] Figure 12 The diagram illustrates a second assembly method between the housing and the top cover 100. The second assembly method uses a special slot design between the top cover 100 and the housing. There are misalignment gaps between the housing partition wall 210 and the two top cover partition walls 110, and there are wiring gaps between the upper surface of the housing partition wall 210 and the lower surface of the top cover 100.

[0006] In the shielding design of motor controllers, complete physical isolation between the two cavities is not required, but electrical isolation must be achieved to prevent EMC interference. Figure 13 and Figure 14 Simulation results show that none of the existing shielding designs can achieve electromagnetic isolation. Utility Model Content

[0007] The purpose of this application is to provide a controller housing and a motor controller, thereby solving the problem that existing shielding designs for motor controllers cannot achieve electromagnetic isolation.

[0008] According to a first aspect of this application, a controller housing is provided, the controller housing including a shell, a top cover, and a plurality of elastic members; the elastic members include elastic elements; the shell includes a shell body and a shell partition wall, one side of the shell body is open, the shell partition wall is connected to the shell body to divide the interior of the shell body into a plurality of receiving spaces, the top cover is disposed on one side of the shell body so that the plurality of receiving spaces form a plurality of receiving cavities; there is an assembly gap between the shell partition wall and the top cover, the plurality of elastic members are connected to one of the shell partition wall and the top cover, the elastic element of each elastic member is disposed in the assembly gap, and the elastic element is pressed between the shell partition wall and the top cover.

[0009] In any of the above technical solutions, the elastic member further includes a fixing part, and the elastic element is connected to the fixing part; the elastic element is a spring sheet; the fixing part is connected to the first of the housing partition wall and the top cover, and the spring sheet is raised from the fixing part toward the side where the second of the housing partition wall and the top cover is located, and the spring sheet is pressed against the second of the housing partition wall and the top cover.

[0010] In any of the above technical solutions, the fixing part is further engaged with the housing partition wall, the spring piece is raised from the fixing part toward the side where the upper cover is located, and the spring piece is pressed against the upper cover.

[0011] In any of the above technical solutions, the fixing part further includes a support piece and two clamping pieces; the support piece is disposed on the surface of the housing partition wall, and the two clamping pieces are bent from both ends of the support piece toward the two sides of the housing partition wall, and the two clamping pieces can clamp the housing partition wall; the spring piece is raised from the support piece toward the side where the upper cover is located.

[0012] In any of the above technical solutions, further, a plurality of the elastic members are spaced apart in a first direction; the support piece has a through hole extending through itself, the through hole extending along the first direction, the through hole including a first hole wall and a second hole wall opposite to each other in the first direction; one end of the elastic piece is connected to the first hole wall, and the other end of the elastic piece extends toward the second hole wall.

[0013] In any of the above technical solutions, the top cover and the shell are both integrally cast parts.

[0014] In any of the above technical solutions, the upper cover, the shell, and the elastic member are all metal components.

[0015] In any of the above technical solutions, the upper cover further includes a cover body and an upper cover partition wall; the upper cover partition wall is connected to the cover body, the upper cover partition wall extends from the cover body to the side where the housing partition wall is located, the upper cover partition wall and the housing partition wall are correspondingly arranged, and there is an assembly gap between the housing partition wall and the upper cover partition wall, and a plurality of elastic members are connected to one of the housing partition wall and the upper cover partition wall, and the elastic members are pressed between the housing partition wall and the upper cover partition wall.

[0016] According to a second aspect of this application, a motor controller is provided, including a controller housing as described above. The motor controller also includes electronic devices disposed within the plurality of said receiving cavities.

[0017] In any of the above technical solutions, further, the distance between any two adjacent elastic components is equal; the motor controller satisfies: d < λ / 4, λ = V / f; where f is the shielding frequency required by the motor controller, V is the speed of light, λ is the wavelength, and d is the distance between any two adjacent elastic components.

[0018] The controller housing of this application includes a housing, a top cover, and multiple elastic members. The elastic members include elastic elements; the housing includes a housing body and a housing partition wall, one side of the housing body is open, the housing partition wall is connected to the housing body to divide the interior of the housing body into multiple receiving spaces, and the top cover is disposed on one side of the housing body so that the multiple receiving spaces form multiple receiving cavities; there is an assembly gap between the housing partition wall and the top cover, and the multiple elastic members are connected to one of the housing partition wall and the top cover, with the elastic element of each elastic member disposed in the assembly gap, and the elastic element pressed between the housing partition wall and the top cover.

[0019] Based on the above technical features, the beneficial effects of this application are as follows:

[0020] In this application, an assembly gap exists between the shell partition and the top cover. Multiple elastic elements are disposed within this assembly gap, pressing against the shell partition and the top cover to ensure stable contact between the elastic elements and both, thereby sealing the assembly gap. In other words, the multiple elastic elements (the volume of the elastic elements) in this application form multiple points of contact with the assembly gap, achieving multiple points of sealing. Compared to the entire assembly gap in the prior art, this provides better electromagnetic isolation and effectively prevents EMC interference.

[0021] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the overall structure of the controller housing according to an embodiment of this application is shown;

[0024] Figure 2 This diagram illustrates the controller housing of an embodiment of this application before the elastic member is installed.

[0025] Figure 3 A schematic diagram showing the housing after the elastic member of an embodiment of this application is installed;

[0026] Figure 4 A schematic diagram of the overall structure of the top cover according to an embodiment of this application is shown;

[0027] Figure 5 A cross-sectional view of the controller housing according to an embodiment of this application is shown;

[0028] Figure 6 Show Figure 5 A partially enlarged schematic diagram;

[0029] Figure 7 Show Figure 3 Another structural diagram from another perspective;

[0030] Figure 8 A schematic diagram of the overall structure of the elastic member according to an embodiment of this application is shown;

[0031] Figure 9 Show Figure 8 Side view;

[0032] Figure 10 Show Figure 8 The main view;

[0033] Figure 11 The diagram shows a first assembly method of the existing controller housing and the housing and the top cover;

[0034] Figure 12 The diagram shows a second assembly method for the existing controller housing and the housing and top cover;

[0035] Figure 13 The simulation diagram shows the electromagnetic leakage situation under the first assembly method of the existing controller housing and the top cover;

[0036] Figure 14 The simulation diagram shows the electromagnetic leakage situation under the second assembly method of the existing controller housing and the housing and the top cover;

[0037] Figure 15 A simulation diagram of the electromagnetic leakage situation of the controller housing of this application is shown;

[0038] Figure 16 A comparison diagram is shown of the electromagnetic leakage of the controller housing of this application and that of existing controller housings when the shielding frequency is 1.4 GHz.

[0039] Icons: 100-Top cover; 110-Top cover partition; 120-Cover body; 130-Eaves; 200-Shell; 210-Shell partition; 220-Shell body; 300-Elastic component; 310-Spring; 320-Support piece; 321-Through hole; 330-Clamping piece; L-First direction. Detailed Implementation

[0040] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0041] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0042] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0043] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0044] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0045] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0046] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0047] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0048] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0049] The first aspect of this application provides a controller housing, thereby solving the problem that existing shielding designs for motor controllers cannot achieve electromagnetic isolation. See below for reference. Figures 1 to 10 The present application describes a controller housing according to some embodiments. Furthermore, for ease of description, the same reference numerals are used below for the upper cover partition 110, upper cover 100, and housing partition 210 in the prior art, and for the upper cover partition 110, upper cover 100, and housing partition 210 in the present application.

[0050] like Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the controller housing of this application includes a housing 200, a top cover 100, and a plurality of elastic members 300. The elastic members 300 include elastic elements (e.g., spring sheets 310); the housing 200 includes a housing body 220 and a housing partition wall 210, with one side of the housing body 220 open. The housing partition wall 210 is connected to the housing body 220 to divide the interior of the housing body 220 into a plurality of receiving spaces. The top cover 100 covers one side of the housing body 220 so that the plurality of receiving spaces form a plurality of receiving cavities; there is an assembly gap between the housing partition wall 210 and the top cover 100. The plurality of elastic members 300 are connected to one of the housing partition wall 210 and the top cover 100. The elastic element (e.g., spring sheet 310) of each elastic member 300 is disposed in the assembly gap, and the elastic element is pressed between the housing partition wall 210 and the top cover 100.

[0051] In other words, an assembly gap exists between the housing partition 210 and the top cover 100 in this application. Multiple elastic elements (e.g., spring sheets 310) are disposed in the assembly gap, pressing against the housing partition 210 and the top cover 100 to ensure stable contact between the elastic elements and both the housing partition 210 and the top cover 100, thereby sealing the assembly gap. That is, the multiple elastic elements (the volume of the elastic elements) in this application form multiple contacts with the assembly gap, achieving multiple points of sealing. Compared to the entire assembly gap in the prior art, the electromagnetic isolation effect is better, effectively preventing EMC interference.

[0052] In the embodiments of this application, such as Figure 2 , Figure 3 and Figure 4As shown, taking the shell partition wall 210 as an example, a shell partition wall 210 is disposed in the middle of the shell body 220, dividing the interior of the shell body 220 into two receiving spaces. Correspondingly, the upper cover 100 is disposed on one side of the shell body 220 so that the two receiving spaces form two receiving cavities. The upper cover 100 includes a cover body 120, an upper cover partition wall 110, and an eaves 130 disposed along the outer edge of the cover body 120; the outer eaves are connected to the shell body 220, the upper cover partition wall 110 is connected to the cover body 120, the upper cover partition wall 110 extends from the cover body 120 to the side where the shell partition wall 210 is located, the upper cover partition wall 110 and the shell partition wall 210 are correspondingly disposed, and there is an assembly gap between the shell partition wall 210 and the upper cover partition wall 110.

[0053] In the embodiments of this application, preferably, the top cover 100 and the shell 200 are both integrally cast parts. There is an assembly gap between the top cover partition wall 110 and the shell partition wall 210.

[0054] In this embodiment, as a first example, such as Figure 5 and Figure 6 As shown, the upper cover partition wall 110 and the housing partition wall 210 are arranged opposite each other, and there is an assembly gap between the housing partition wall 210 and the upper cover partition wall 110. Multiple elastic members 300 are connected to one of the housing partition wall 210 and the upper cover partition wall 110, and the elastic members (e.g., spring sheet 310) are pressed between the housing partition wall 210 and the upper cover partition wall 110.

[0055] In this embodiment, as a second example (not shown in the figure), it is similar to the first assembly method in the prior art (see reference). Figure 11 That is, the upper cover partition wall 110 and the shell partition wall 210 are correspondingly misaligned, and there is an assembly gap between the shell partition wall 210 and the upper cover partition wall 110. Multiple elastic members are connected to one of the shell partition wall 210 and the upper cover partition wall 110, and the elastic members (e.g., spring sheets) are pressed between the shell partition wall 210 and the upper cover partition wall 110.

[0056] The following description will use the first example as an example. Figure 6 As shown, the elastic member 300 also includes a fixing part, and the elastic member is a spring sheet 310. The spring sheet 310 is connected to the fixing part, the fixing part is connected to the housing partition wall 210, the spring sheet 310 is raised from the fixing part to the side where the upper cover 100 is located, and the spring sheet 310 is pressed against the upper cover partition wall 110.

[0057] This configuration, with multiple spring clips 310 pressed between the housing partition wall 210 and the upper cover partition wall 110, ensures stable contact between the spring clips 310 and both partition walls 210 and 110, reducing assembly gaps and thus lowering electromagnetic leakage. Furthermore, as part of the fastening mechanism, the spring clips 310 also enhance the overall stability and sealing of the structure, indirectly contributing to EMC protection. Additionally, the uniform pressure distribution of the multiple spring clips 310 prevents excessively large local assembly gaps, ensuring uniform contact across the entire mating surface. Moreover, this design maintains necessary mechanical assembly tolerances while the elastic compensation of the spring clips 310 prevents gap expansion due to vibration or deformation, preserving the integrity of the electromagnetic shielding.

[0058] Furthermore, the connection between the fixing part and the housing partition 210 can be achieved by riveting, screw installation, or welding. Preferably, in the embodiments of this application, the fixing part is snap-fitted to the housing partition 210. This snap-fit ​​method facilitates assembly and provides better electrical isolation when used in conjunction with the spring clip 310.

[0059] Specifically, such as Figure 6 , Figure 8 , Figure 9 and Figure 10 As shown, the fixing part of this application includes a support piece 320 and two clamping pieces 330. The support piece 320 is disposed on the surface of the housing partition wall 210, and the two clamping pieces 330 are bent from both ends of the support piece 320 toward the two sides of the housing partition wall 210, respectively. The two clamping pieces 330 can clamp the housing partition wall 210, and the spring piece 310 is raised from the support piece 320 to the side where the upper cover 100 is located.

[0060] In addition, for ease of manufacturing, such as Figure 8 As shown, multiple elastic members 300 are spaced apart in the first direction L. The support plate 320 has a through hole 321 extending through itself, the through hole 321 extends along the first direction L, and the through hole 321 includes a first hole wall and a second hole wall that are opposite to each other in the first direction L; one end of the elastic piece 310 is connected to the first hole wall, and the other end of the elastic piece 310 extends toward the second hole wall.

[0061] Furthermore, the size and shape of the spring piece 310 can be designed according to actual conditions, and the shape can be a ring, ellipse, rectangle, etc. Preferably, in the embodiment of this application, the spring piece 310 extends along the first direction L to ensure that the spring piece 310 is in stable contact with both the housing partition wall 210 and the upper cover partition wall 110, and the contact area is large, further improving the electrical shielding effect.

[0062] Furthermore, in the embodiments of this application, preferably, the top cover 100, the housing 200, and the elastic member 300 are all metal components. The elastic member 300 can be made of steel or copper, which is easy to install and provides reliable contact. The innovative design of the metal elastic member 300 in this application enables elastic connection between gaps in different metal components, and is easy and reliable to install.

[0063] A second aspect of this application provides a motor controller, which includes the controller housing described above. The motor controller also includes electronic components disposed within two receiving cavities.

[0064] Furthermore, it is worth mentioning that in the embodiments of this application, such as Figure 7 As shown, the distance between any two adjacent elastic members 300 is equal, and the distance d between two adjacent elastic members 300 can be increased or decreased according to the required shielding frequency.

[0065] Specifically, the motor controller satisfies: d < λ / 4, λ = V / f. Here, f is the required shielding frequency for the motor controller, V is the speed of light, λ is the wavelength, and d is the distance between any two adjacent elastic components. For example, to achieve EMC shielding within 1.4 GHz, the spacing d is 2 cm.

[0066] The electromagnetic shielding cloud diagrams of the controller housing design in this application and the existing controller housing designs were obtained through EMC simulation methods, and the effects are compared as follows.

[0067] from Figure 13 and Figure 14 It can be seen that in the existing technology, both the first assembly method of the shell and the top cover and the second assembly method of the shell and the top cover have poor EMC shielding effect, and the right cavity is significantly affected by the electromagnetic radiation of the left cavity.

[0068] from Figure 15 It can be seen that in the controller housing design of this application, the right cavity is not affected by the electromagnetic radiation of the left cavity. By using EMC simulation method, it can be concluded that the shielding design of this application is effective.

[0069] Figure 16 A comparison diagram illustrates the electromagnetic leakage of the controller housing of this application with that of existing controller housings at a shielding frequency of 1.4 GHz. From... Figure 16 It can be seen that the shielding design of this application is effective.

[0070] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the scope of the technology disclosed in this application, or make equivalent substitutions for some of the technical features. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application.

Claims

1. A controller housing, characterized in that, The controller housing includes a shell, a top cover, and multiple elastic components; the elastic components include elastic elements. The shell includes a shell body and a shell partition wall. One side of the shell body is open. The shell partition wall is connected to the shell body to divide the interior of the shell body into multiple receiving spaces. The top cover is provided on one side of the shell body so that the multiple receiving spaces form multiple receiving cavities. There is an assembly gap between the housing partition and the top cover. A plurality of elastic members are connected to one of the housing partition and the top cover. The elastic element of each elastic member is disposed in the assembly gap and is pressed between the housing partition and the top cover.

2. The controller housing according to claim 1, characterized in that, The elastic member further includes a fixing part, and the elastic element is connected to the fixing part; the elastic element is a spring sheet; The fixing part is connected to the first of the housing partition wall and the top cover, and the spring piece is tilted from the fixing part toward the second of the housing partition wall and the top cover, and the spring piece is pressed against the second of the housing partition wall and the top cover.

3. The controller housing according to claim 2, characterized in that, The fixing part is engaged with the housing partition wall, the spring piece is raised from the fixing part toward the side where the upper cover is located, and the spring piece is pressed against the upper cover.

4. The controller housing according to claim 3, characterized in that, The fixing part includes a support piece and two clamping pieces; The support piece is disposed on the surface of the shell partition wall, and the two clamping pieces are bent from both ends of the support piece toward the two sides of the shell partition wall, and the two clamping pieces can clamp the shell partition wall; The spring clip tilts upwards from the support piece toward the side where the upper cover is located.

5. The controller housing according to claim 4, characterized in that, The plurality of elastic members are spaced apart in a first direction; The support piece has a through hole extending through itself, the through hole extending along the first direction, and the through hole includes a first hole wall and a second hole wall that are opposite to each other in the first direction; One end of the spring is connected to the first hole wall, and the other end of the spring extends toward the second hole wall.

6. The controller housing according to any one of claims 1-5, characterized in that, Both the top cover and the shell are integrally cast parts.

7. The controller housing according to any one of claims 1-5, characterized in that, The top cover, the housing, and the elastic member are all metal components.

8. The controller housing according to any one of claims 1-5, characterized in that, The upper cover includes a cover body and an upper cover partition wall; The upper cover partition wall is connected to the cover body, and extends from the cover body towards the side where the housing partition wall is located. The upper cover partition wall and the housing partition wall are correspondingly arranged, and there is an assembly gap between the housing partition wall and the upper cover partition wall. The plurality of elastic members are connected to one of the housing partition wall and the upper cover partition wall, and the elastic members are pressed between the housing partition wall and the upper cover partition wall.

9. A motor controller, characterized in that, The motor controller includes a controller housing as described in any one of claims 1-8; The motor controller also includes electronic devices disposed within the plurality of the receiving cavities.

10. The motor controller according to claim 9, characterized in that, The distance between any two adjacent elastic members is equal; The motor controller satisfies: d < λ / 4, λ = V / f; Where f is the shielding frequency required by the motor controller, V is the speed of light, λ is the wavelength, and d is the distance between any two adjacent elastic components.

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