Structure for reducing stray feeling of motor controller and motor controller

Abstract

The invention provides a structure for reducing the stray feeling of a motor controller and the motor controller. The structure is arranged at the joint of the DC-Link module and the power module. The structure for reducing the stray feeling of the motor controller comprises a first cover plate and a second cover plate, wherein the first cover plate and the second cover plate are both made of metal materials; the first cover plate is arranged on the first end surface of the connection part of the DC-Link module and the power module; the position, corresponding to the P output connecting part, of the first cover plate is coated with an insulating layer. The second cover plate is arranged on a second end face, opposite to the first end face, at the joint of the DC-Link module and the power module; the second cover plate is coated with an insulating layer at a position corresponding to the N output connection part. The distance between the P output terminal and the N output terminal is shortened through the first cover plate, so that the stray feeling generated by the DC-Link module can be eliminated. The distance between the P'output terminal and the N 'output terminal is shortened through the second cover plate, so that the stray feeling generated by the power rate module can be eliminated.

Description

Technical Field

[0001] The present application relates to the technical field of new energy motor controllers, and in particular to a structure for reducing noise in a motor controller and a motor controller. Background Art

[0002] The motor controller occupies an important position in the three-electric system of new energy vehicles. The switching speed of IGBT (power module) / SIC in the power device affects the efficiency of the motor controller; the faster the switching speed, the higher the efficiency of the motor controller.

[0003] Specifically, the power circuit noise inductance comes from the DC-link module (DC bus) and IGBT (power module). Generally, the power module noise inductance is about 20+nH (nanohenry), and the DC-link module is about 5nH-8nH. In other words, the power circuit noise inductance is at least 25nH. However, there is currently no good solution for the above high noise inductance.

[0004] Therefore, there is an urgent need for a structure and a motor controller that reduce the noise of the motor controller, so as to solve the technical problems existing in the prior art to a certain extent. Summary of the invention

[0005] The purpose of the present application is to provide a structure and a motor controller for reducing the noise inductance of a motor controller, thereby reducing the noise inductance technical problem of the motor controller to a certain extent.

[0006] The present application provides a structure for reducing the noise inductance of a motor controller; the motor controller comprises a DC-Link module and a power module; the DC-Link module comprises a plurality of P output terminals and a plurality of N output terminals, and the plurality of P output terminals and the plurality of N output terminals are arranged at intervals with a preset gap along a first direction; the power module comprises a plurality of P' output terminals and a plurality of N' output terminals, and the plurality of P' output terminals correspond to the plurality of P output terminals one by one and are connected through a connector to form a P output connection portion; the plurality of N' output terminals correspond to the plurality of N output terminals one by one and are connected through the connector to form an N output connection portion; the structure for reducing the noise inductance of the motor controller is arranged at the connection between the DC-Link module and the power module;

[0007] The structure for reducing the noise inductance of the motor controller comprises a first cover plate and a second cover plate, and the first cover plate and the second cover plate are both made of metal;

[0008] The first cover plate is arranged at a first preset distance on a first end surface where the DC-Link module and the power module are connected; the first cover plate is coated with an insulating layer at a position corresponding to the P output connection portion;

[0009] The second cover plate is arranged at a second preset distance on a second end surface at a connection point between the DC-Link module and the power module and opposite to the first end surface; and an insulating layer is coated on a position of the second cover plate corresponding to the N output connection portion.

[0010] In the above technical solution, further, at least a portion of the first cover plate corresponding to the preset gap is coated with an insulating layer;

[0011] The second cover plate is formed with a first bending portion at the position corresponding to the preset gap, and the first bending includes a first section, a second section and a third section; the first section, the second section and the third section are connected in sequence to form an inverted concave shape, and the first section, the second section and the third section are all coated with an insulating layer.

[0012] In the above technical solution, further, the position of the second cover plate corresponding to the preset gap is at least partially coated with an insulating layer; the first cover plate is formed with a first bending portion at the position corresponding to the preset gap, and the first bend includes a first segment, a second segment and a third segment; the first segment, the second segment and the third segment are connected in sequence to form a concave shape, and the first segment, the second segment and the third segment are all coated with an insulating layer.

[0013] In the above technical solution, further, a first through hole is formed at a position of the first cover plate corresponding to the P output connection portion, and the connector passes through the first through hole to connect the P output terminal with the P' output terminal; a second through hole is formed at a position of the first cover plate corresponding to the N output connection portion, and the connector passes through the second through hole to connect the N output terminal with the N' output terminal.

[0014] In the above technical solution, further, the diameter of the first through hole is greater than or equal to the diameter of the connecting member, and the diameter of the second through hole is less than or equal to the diameter of the connecting member.

[0015] In the above technical solution, further, the second cover plate is provided with a third through hole at a position corresponding to the P output connection portion, and the connector passes through the third through hole to connect the P output terminal with the P' output terminal; the second cover plate is provided with a fourth through hole at a position corresponding to the N output connection portion, and the connector passes through the fourth through hole to connect the N output terminal with the N' output terminal.

[0016] In the above technical solution, further, the diameter of the third through hole is less than or equal to the diameter of the connecting member, and the diameter of the fourth through hole is greater than or equal to the diameter of the connecting member.

[0017] In the above technical solution, further, the plurality of P output terminals and the plurality of N output terminals are arranged at intervals along the first direction and staggered along the second direction;

[0018] The first cover plate is formed with a first bending portion at the preset gap position, and at least a portion of the first bending portion is coated with an insulating layer;

[0019] The second cover plate is formed with a second bending portion at the preset gap position, and at least a portion of the second bending portion is coated with an insulating layer.

[0020] In the above technical solution, further, the first bending portion includes a first section and a second section, the first section and the second section are vertically connected at a first position, and the first section is coated with an insulating layer;

[0021] The second bending portion includes a third section and a fourth section, the third section and the fourth section are vertically connected at a second position, and the fourth section is coated with an insulating layer.

[0022] The present application also provides a motor controller, comprising the above-mentioned structure for reducing the noise inductance of the motor controller.

[0023] Compared with the prior art, this application has the following beneficial effects:

[0024] The present application provides a structure for reducing the noise inductance of a motor controller; the motor controller comprises a DC-Link module and a power module; the DC-Link module comprises a plurality of P output terminals and a plurality of N output terminals, and the plurality of P output terminals and the plurality of N output terminals are arranged at intervals with a preset gap along a first direction; the power module comprises a plurality of P' output terminals and a plurality of N' output terminals, and the plurality of P' output terminals correspond to the plurality of P output terminals one by one and are connected through a connector to form a P output connection portion; the plurality of N' output terminals correspond to the plurality of N output terminals one by one and are connected through the connector to form an N output connection portion; the structure for reducing the noise inductance of the motor controller is arranged at the connection between the DC-Link module and the power module;

[0025] The structure for reducing the noise inductance of the motor controller comprises a first cover plate and a second cover plate, and the first cover plate and the second cover plate are both made of metal;

[0026] The first cover plate is arranged at a first preset distance on a first end surface where the DC-Link module and the power module are connected; the first cover plate is coated with an insulating layer at a position corresponding to the P output connection portion;

[0027] The second cover plate is arranged at a second preset distance on a second end surface at a connection point between the DC-Link module and the power module and opposite to the first end surface; and an insulating layer is coated on a position of the second cover plate corresponding to the N output connection portion.

[0028] In summary, the distance between the P output terminal and the N output terminal is shortened by the first cover, thereby eliminating the inductance generated by the DC-Link module. The distance between the P' output terminal and the N' output terminal is shortened by the second cover, thereby eliminating the inductance generated by the power module, thereby improving the efficiency of the motor controller and the range of the electric vehicle. It is known from the test that the scheme of the application can reduce the inductance of the power circuit by 3-5nH.

[0029] The present application also provides a motor controller, including the above-mentioned structure for reducing the noise inductance of the motor controller, and thus has all the beneficial effects of the above-mentioned structure for reducing the noise inductance of the motor controller, and thus will not be elaborated. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A schematic diagram of the structure of reducing the noise inductance of the motor controller provided in the first embodiment on the first end surface;

[0032] Figure 2 A schematic diagram of the structure of reducing the noise inductance of the motor controller provided in the first embodiment on the second end surface;

[0033] Figure 3 A schematic diagram of the structure for reducing the noise inductance of the motor controller provided in the first embodiment;

[0034] Figure 4 for Figure 3 A in the enlarged view;

[0035] Figure 5 A schematic diagram of the structure of reducing the noise inductance of the motor controller provided in the second embodiment on the first end surface;

[0036] Figure 6 A schematic diagram of the structure of reducing the noise inductance of the motor controller provided in the second embodiment on the second end surface;

[0037] Figure 7A schematic diagram of the structure for reducing the noise inductance of the motor controller provided in the second embodiment;

[0038] Figure 8 for Figure 3 Enlarged view of point B in .

[0039] Figure markings: 1-P output terminal; 2-N output terminal; 3-first direction; 4-P' output terminal; 5-N' output terminal; 6-P output connection part; 7-connecting piece; 8-N output connection part; 9-first cover plate; 10-second cover plate; 11-first through hole; 12-nut; 13-second through hole; 14-third through hole; 15-fourth through hole; 16-second direction; 17-first bending part; 18-second bending part; 19-first section; 20-second section; 21-third section; 22-fourth section; 23-first position; 24-second position; 25-stud; 27-insulating layer; 28-first section; 29-second section; 30-third section. DETAILED DESCRIPTION

[0040] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve 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 interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

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

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

[0044] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0045] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the 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 relational terms used herein will be interpreted accordingly.

[0046] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0047] Variations in the shapes shown in the 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 drawings but include variations in shapes that occur during manufacturing.

[0048] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0049] Embodiment 1

[0050] The motor controller includes a DC-Link module and a power module. In actual use, the power circuit composed of the DC-Link module and the power module will produce a large amount of noise, which seriously affects the efficiency of the motor controller. Based on this, the present application has developed a structure to reduce the noise of the motor controller. Figure 1-Figure 4 A structure for reducing noise inductance of a motor controller provided by the present application is described in detail.

[0051] First, the motor controller includes a DC-Link module and a power module; combined Figure 1 As shown in (a) Figure 1 Part (a) refers to the cross-sectional view of the DC-Link module and the connection between the power module). The DC-Link module has three P output terminals 1 and three N output terminals 2, and the three P output terminals 1 and the three N output terminals 2 are arranged at preset intervals along the first direction 3, that is, the output ends of the DC-Link module are P output terminal 1-N output terminal 2-P output terminal 1-N output terminal 2-P output terminal 1-N output terminal 2 in sequence.

[0052] The power module has three P' output terminals 4 and three N' output terminals 5, and the three P' output terminals 4 correspond to the three P output terminals 1 one by one and are connected through a connector 7 to form a P output connection portion 6; since the output end of the DC-Link module has three P output terminals 1 and the power module has three P' output terminals 4, three P output connection portions 6 are eventually formed. The N' output terminal 5 corresponds to the three N output terminals 2 one by one and is connected through a connector 7 to form an N output connection portion 8. Since the output end of the DC-Link module has three N output terminals 2 and the power module has three N' output terminals 5, three N output connection portions 8 are eventually formed.

[0053] Combination Figure 3 As shown, the first direction 3 is the length direction of the motor controller. The connecting member 7 is preferably a screw, which includes a stud 25, a nut 12 fixed to one end of the stud 25, and a nut; Figure 1 Taking the leftmost P output connection part 6 in Figure (a) as an example, the connection process is described in detail: first, the stud 25 passes through the P output terminal 1 and the P' output terminal 4 in sequence, and when the nut 12 abuts against the upper end surface of the P output terminal 1, the nut is tightened on the stud 25 and locked on the lower end surface of the P' output terminal 4.

[0054] The present application provides a structure for reducing the noise inductance of the motor controller; the structure is arranged at the connection between the DC-Link module and the power module; specifically, the structure includes a first cover plate 9 and a second cover plate 10, both of which are made of metal; preferably, the first cover plate 9 and the second cover plate 10 are made of copper or aluminum, and of course other alloys. The following is a detailed description of the first cover plate 9 and the second cover plate 10 being made of copper.

[0055] The structure of the first cover plate 9 is as follows: the first cover plate 9 is arranged at a first preset distance on the first end surface where the DC-Link module and the power module are connected; Figure 1 (b) Figure 1 (b) is a top view of the first cover plate 9, the first cover plate 9 is a plate-like structure, which can cover the first end faces of all output ends of the DC-Link module. Figure 1 The upper surface of the output end of the DC-Link module in FIG. (a) is taken as an example, and an insulating layer 27 (combined with Figure 1(c) in the figure), that is, the insulating layer 27 is coated at the position of the first cover plate 9 corresponding to the P output terminal 1, then when the P output connection part 6 is connected through the connector 7, the screw and nut 12 of the connector 7 will not be conductive with the first cover plate 9 coated with the insulating layer 27, and the first cover plate 9 coated with the insulating layer 27 will not be conductive with the P output terminal 1 of the P output connection part 6. In addition, the remaining part of the first cover plate 9 except for the part coated with the insulating layer 27 is not coated with the insulating layer 27, that is, the remaining part is made of bare metal, then when the first cover plate 9 is connected to the N output terminal 2 in the N output connection part 8 through the connector 7, the N output terminal 2 is conductive with the first cover plate 9.

[0056] Since the P output terminal 1 of the DC-Link module is positively charged and the N output terminal 2 of the DC-Link module is negatively charged; since the portion of the first cover plate 9 for the N output terminal 2 is conductively connected to the N output terminal 2, the entire first cover plate 9 will be negatively charged, and since the first cover plate 9 is extended and covered on the first end surface of the P output terminal 1 (the first end surface here can also be understood as the side away from the P' output terminal 4), the following phenomenon will occur at the position of the P output terminal 1: the magnetic field generated by the positive charge of the P output terminal 1 and the magnetic field generated by the negative charge above it are close to each other, and the magnetic field cancels out due to the short distance, thereby eliminating the inductance of the first end surface. That is, the distance between the P output terminal 1 and the N output terminal 2 is shortened by the setting of the first cover plate 9.

[0057] It is worth noting that the above-mentioned first preset distance can be set between 0-3 mm.

[0058] The structure of the second cover plate 10 is as follows: the second cover plate 10 is disposed at a second preset distance at a second end surface at the connection between the DC-Link module and the power module and opposite to the first end surface. The second end surface here refers to the end surface of the power module away from the DC-Link module. Figure 2 In (d), it refers to the lower end surface. Figure 2 (e)( Figure 2 (e) is a top view of the second cover plate 10, the second cover plate 10 can cover the lower end surface, and a first bending portion is formed at a preset position, the first bending portion includes a first section 28, a second section 29 and a third section 30, the first section 28, the second section 29 and the third section 30 are sequentially connected to form an inverted concave shape, and the first section 28, the second section 29 and the third section 30 are all coated with an insulating layer 27. The insulating layer 27 (combined with the N' output connection portion) is coated at the position of the second cover plate 10 corresponding to the N' output connection portion Figure 2In (f) of the figure), that is, the insulating layer 27 is coated at the position of the second cover plate 10 corresponding to the N' output terminal 5, then when the N' output connection part is connected through the connector 7, the screw and nut of the connector 7 will not be conductive with the second cover plate 10 coated with the insulating layer 27, and the second cover plate 10 coated with the insulating layer 27 will not be conductive with the N' output terminal 5 of the N' output connection part. In addition, the remaining part of the second cover plate 10 except for the part coated with the insulating layer 27 is not coated with the insulating layer 27, that is, the remaining part is made of bare metal, then when the second cover plate 10 is connected to the P output terminal 1 in the P' output connection part through the connector 7, the P' output terminal 4 is conductive with the second cover plate 10.

[0059] Since the P' output terminal 4 of the power module is positively charged, and the N' output terminal 5 of the power module is negatively charged; since the part of the second cover plate 10 for the P output terminal 1 is electrically connected to the P' output terminal 4, the entire second cover plate 10 will be positively charged, and since the second cover plate 10 is extended and covered on the second end face of the N' output terminal 5, the following phenomenon will occur at the position of the N' output terminal 5: the magnetic field generated by the negatively charged N' output terminal 5 and the magnetic field generated by the positively charged below it are close to each other, and the magnetic field will be canceled, thereby eliminating the inductance of the first end face. That is, the distance between the N' output terminal 5 and the P' output terminal 4 is shortened by the setting of the second cover plate 10.

[0060] It is worth noting that the second preset distance can be set between 0-3 mm.

[0061] In summary, combined Figure 3 As shown, the distance between the P output terminal 1 and the N output terminal 2 is shortened by the first cover plate 9, thereby eliminating the noise generated by the DC-Link module. The distance between the P' output terminal 4 and the N' output terminal 5 is shortened by the second cover plate 10, thereby eliminating the noise generated by the power module, thereby improving the efficiency of the motor controller and the range of the electric vehicle. It is known from the test that the scheme of the application can reduce the noise of the power circuit by 3-5nH.

[0062] In this embodiment, since the connecting member 7 is made of metal, in order to prevent unnecessary interference between the metal first cover plate 9 and the connecting member 7, the first cover plate 9 is arranged corresponding to the preset gap L1 (combined with Figure 4 The position shown in FIG. 1 is at least partially coated with an insulating layer 27. Specifically, in combination with Figure 1 In Figure (b), the slashed part indicates that an insulating layer 27 is coated on the first cover plate 9, that is, the position of the first cover plate 9 corresponding to the P output terminal 1 and the position of the first cover plate 9 corresponding to the preset gap are coated with the insulating layer 27, that is, no additional unnecessary electromagnetic interference will be generated between the position of the first cover plate 9 corresponding to the preset gap and the connector 7.

[0063] In this embodiment, as in the above, since the connector 7 is made of metal, in order to prevent unnecessary interference between the metal second cover plate 10 and the connector 7, at least a portion of the second cover plate 10 corresponding to the preset gap is coated with an insulating layer 27. Figure 2 In Figure (e), the slashed part indicates that an insulating layer 27 is coated on the second cover plate 10, that is, the position of the second cover plate 10 corresponding to the N' output terminal 5 and the position of the second cover plate 10 corresponding to the preset gap are coated with the insulating layer 27, that is, no additional unnecessary electromagnetic interference will be generated between the position of the second cover plate 10 corresponding to the preset gap and the connector 7.

[0064] In this embodiment, combined Figure 1 As shown in (b), the first cover plate 9 is provided with a first through hole 11 at a position corresponding to the P output connection portion 6, and the connector 7 passes through the first through hole 11 to connect the P output terminal 1 and the P' output terminal 4; the first cover plate 9 is provided with a second through hole 13 at a position corresponding to the N output connection portion 8, and the connector 7 passes through the second through hole 13 to connect the N output terminal 2 and the N' output terminal 5.

[0065] Specifically, the diameter of the first through hole 11 is greater than or equal to the diameter of the nut 12 of the connecting member 7 , and the diameter of the second through hole 13 is less than or equal to the diameter of the nut 12 of the connecting member 7 .

[0066] When the first cover plate 9 is arranged on the first end surface, during the connection process of the connector 7, the screw rod sequentially passes through the first cover plate 9, the P output terminal 1 and the P' output terminal 4, and when the nut 12 abuts against the first cover plate 9, the nut is locked on the lower surface of the P' output terminal 4. Since the nut 12 has a certain weight, when the nut 12 abuts against the first cover plate 9, it may crush the first cover plate 9 and cause damage to the first cover plate 9. In order to overcome this technical problem, the present application sets the diameter of the first through hole 11 to be greater than or equal to the diameter of the nut 12 of the connector 7, that is, when the first cover plate 9 is arranged on the first end surface and connected by the connector 7, the nut 12 will eventually abut against the upper end surface of the P output terminal 1 through the first through hole 11.

[0067] It is worth noting that the sidewall of the first through hole 11 is also coated with an insulating layer 27 to prevent the sidewall of the first through hole 11 from being electrically connected to the nut 12. The shape of the first through hole 11 is not specifically limited and can be circular or square.

[0068] As for the second through hole 13, since the nut 12 is made of metal and the first cover plate 9 is also made of metal, the nut 12 can be completely abutted against the first end cover to increase the conductivity of the nut 12 and the first cover plate 9 and increase the negative electricity generated. Therefore, the diameter of the second through hole 13 is set to be less than or equal to the diameter of the nut 12 of the connector 7.

[0069] In this embodiment, combined with Figure 2 As shown in (e), the second cover plate 10 is provided with a third through hole 14 at a position corresponding to the P output connection portion 6, and the connector 7 passes through the third through hole 14 to connect the P output terminal 1 and the P' output terminal 4; the second cover plate 10 is provided with a fourth through hole 15 at a position corresponding to the N output connection portion 8, and the connector 7 passes through the fourth through hole 15 to connect the N output terminal 2 and the N' output terminal 5.

[0070] Specifically, the diameter of the third through hole 14 is smaller than or equal to the diameter of the connecting member 7 , and the diameter of the fourth through hole 15 is larger than or equal to the diameter of the connecting member 7 .

[0071] When the second cover plate 10 is arranged on the second end surface, during the connection process of the connector 7, the screw rod sequentially passes through the first cover plate 9, the N output terminal 2 and the N' output terminal 5, and when the nut 12 abuts against the second cover plate 10, the nut is locked on the lower surface of the N' output terminal 5. Since the nut has a certain weight, when the nut is locked on the lower surface of the N' output terminal 5, it may crush the second cover plate 10 and cause damage to the second cover plate 10. In order to overcome this technical problem, the present application sets the diameter of the fourth through hole 15 to be greater than or equal to the diameter of the nut of the connector 7, that is, when the second cover plate 10 is arranged on the second end surface and connected by the connector 7, the nut will eventually abut against the lower end surface of the N' output terminal 5 through the fourth through hole 15.

[0072] It is worth noting that the sidewall of the fourth through hole 15 is also coated with an insulating layer 27 to prevent the sidewall of the fourth through hole 15 from being electrically connected to the nut. The shape of the fourth through hole 15 is not specifically limited and can be circular or square.

[0073] As for the third through hole 14, since the nut is made of metal and the second cover plate 10 is also made of metal, the nut can be completely abutted against the first end cover to increase the conductivity of the nut and the second cover plate 10 and increase the negative electricity generated. Therefore, the diameter of the third through hole 14 is set to be less than or equal to the diameter of the nut of the connector 7.

[0074] Embodiment 2

[0075] This embodiment provides another structure for reducing the noise of the motor controller. In this embodiment, the second cover plate is in the shape of a plate, and at least a portion of the second cover plate corresponding to the preset gap is coated with an insulating layer; the first cover plate is formed with a first bending portion at the position corresponding to the preset gap, and the first bend includes a first segment, a second segment and a third segment; the first segment, the second segment and the third segment are connected in sequence to form a concave shape, and the first segment, the second segment and the third segment are all coated with an insulating layer.

[0076] It is worth noting that the structures of the first cover plate and the second cover plate in this embodiment are just opposite to those of the first cover plate and the second cover plate in the first embodiment, and the principle thereof will not be elaborated in detail.

[0077] Embodiment 3

[0078] In this embodiment, for another structural form of the DC-Link module and the power module, the present application provides another structure for reducing the noise inductance of the motor controller. Figure 5-Figure 8 Elaborate in detail.

[0079] In this embodiment, combined with Figure 5 As shown in (a), multiple P output terminals 1 and multiple N output terminals 2 are arranged at intervals along the first direction 3 and staggered along the second direction 16; the first direction 3 here refers to the length direction of the DC-Link module, and the second direction 16 refers to the width direction of the DC-Link module.

[0080] Specifically, the first cover plate 9 is formed with a first bent portion 17 at a preset gap position, and at least a portion of the first bent portion 17 is coated with an insulating layer 27; the second cover plate 10 is formed with a second bent portion 18 at a preset gap position, and at least a portion of the second bent portion 18 is coated with an insulating layer 27. The at least partial coating with the insulating layer 27 can prevent interference between two adjacent connectors 7.

[0081] It is worth noting that: in the first embodiment, the preset gap has a size only in the first direction 3 , while in this embodiment, the preset gap is formed in both the first direction 3 and the second direction 16 .

[0082] In addition, the distance between the P output terminal 1 and the N output terminal 2 is shortened by the first cover plate 9, thereby eliminating the inductance generated by the DC-Link module. The distance between the P' output terminal 4 and the N' output terminal 5 is shortened by the second cover plate 10, thereby eliminating the inductance generated by the power module. The principle is similar to the first embodiment, which is not specifically described in this embodiment, and can be understood by those skilled in the art.

[0083] Furthermore, combined with Figure 8As shown, the first bending portion 17 includes a first section 19 and a second section 20, and the first section 19 and the second section 20 are vertically connected at a first position 23, where the first position 23 refers to the point where the N output terminal 2 is closest to the P output terminal 1 among the adjacent P output terminals 1 and N output terminals 2. Figure 8 As shown, the second bending portion 18 includes a third section 21 and a fourth section 22, and the third section 21 and the fourth section 22 are vertically connected at a second position 24. The second position 24 here refers to the point where the P' output terminal 4 is closest to the N' output terminal 5 among the adjacent P' output terminals 4 and N' output terminals 5.

[0084] Furthermore, the first section 19 is coated with the insulating layer 27, the second section 20 is not coated with the insulating layer 27, the fourth section 22 is coated with the insulating layer 27, and the third section 21 is not coated with the insulating layer 27. Figure 8 As shown, it can be seen that the first section 19 and the fourth section 22 correspond to each other and are both coated with an insulating layer 27 , thereby preventing interference between two adjacent connecting members 7 .

[0085] Embodiment 3

[0086] The present application also provides a motor controller, including the above-mentioned structure for reducing the noise inductance of the motor controller, and thus has all the beneficial effects of the above-mentioned structure for reducing the noise inductance of the motor controller, and thus will not be elaborated.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A structure for reducing noise in a motor controller; the motor controller comprises a DC-Link module and a power module; the DC-Link module comprises a plurality of P output terminals and a plurality of N output terminals, the plurality of P output terminals and the plurality of N output terminals are arranged at preset intervals along a first direction; the power module comprises a plurality of P' output terminals and a plurality of N' output terminals, the plurality of P' output terminals correspond to the plurality of P output terminals one by one and are connected through a connector to form a P output connection portion; the plurality of N' output terminals correspond to the plurality of N output terminals one by one and are connected through the connector to form an N output connection portion; characterized in that, The structure for reducing the noise inductance of the motor controller is arranged at the connection between the DC-Link module and the power module; The structure for reducing the noise inductance of the motor controller comprises a first cover plate and a second cover plate, and the first cover plate and the second cover plate are both made of metal; The first cover plate is arranged at a first preset distance on a first end surface where the DC-Link module and the power module are connected; the first cover plate is coated with an insulating layer at a position corresponding to the P output connection portion; The second cover plate is arranged at a second preset distance on a second end surface at a connection point between the DC-Link module and the power module and opposite to the first end surface; and an insulating layer is coated on a position of the second cover plate corresponding to the N output connection portion.

2. The structure for reducing noise inductance of a motor controller according to claim 1, characterized in that: At least a portion of the first cover plate corresponding to the preset gap is coated with an insulating layer; The second cover plate is formed with a first bending portion at the position corresponding to the preset gap, and the first bending includes a first section, a second section and a third section; the first section, the second section and the third section are connected in sequence to form an inverted concave shape, and the first section, the second section and the third section are all coated with an insulating layer.

3. The structure for reducing noise inductance of a motor controller according to claim 1, characterized in that: At least a portion of the position of the second cover plate corresponding to the preset gap is coated with an insulating layer; a first bend is formed at the position of the first cover plate corresponding to the preset gap, and the first bend includes a first segment, a second segment and a third segment; the first segment, the second segment and the third segment are connected in sequence to form a concave shape, and the first segment, the second segment and the third segment are all coated with an insulating layer.

4. The structure for reducing noise inductance of a motor controller according to claim 1, characterized in that: A first through hole is formed at a position of the first cover plate corresponding to the P output connection portion, and the connector passes through the first through hole to connect the P output terminal and the P' output terminal; a second through hole is formed at a position of the first cover plate corresponding to the N output connection portion, and the connector passes through the second through hole to connect the N output terminal and the N' output terminal.

5. The structure for reducing noise inductance of a motor controller according to claim 4, characterized in that: The diameter of the first through hole is greater than or equal to the diameter of the connecting member, and the diameter of the second through hole is less than or equal to the diameter of the connecting member.

6. The structure for reducing noise inductance of a motor controller according to claim 1, characterized in that: A third through hole is formed on the second cover plate at a position corresponding to the P output connection portion, and the connector passes through the third through hole to connect the P output terminal and the P' output terminal; a fourth through hole is formed on the second cover plate at a position corresponding to the N output connection portion, and the connector passes through the fourth through hole to connect the N output terminal and the N' output terminal.

7. The structure for reducing noise inductance of a motor controller according to claim 6, characterized in that: The diameter of the third through hole is smaller than or equal to the diameter of the connecting member, and the diameter of the fourth through hole is greater than or equal to the diameter of the connecting member.

8. The structure for reducing noise inductance of a motor controller according to claim 1, characterized in that: The plurality of P output terminals and the plurality of N output terminals are arranged at intervals along the first direction and staggered along the second direction; The first cover plate is formed with a first bending portion at the preset gap position, and at least a portion of the first bending portion is coated with an insulating layer; The second cover plate is formed with a second bending portion at the preset gap position, and at least a portion of the second bending portion is coated with an insulating layer.

9. The structure for reducing noise inductance of a motor controller according to claim 8, characterized in that: The first bending portion includes a first section and a second section, the first section and the second section are vertically connected at a first position, and the first section is coated with an insulating layer; The second bending portion includes a third section and a fourth section, the third section and the fourth section are vertically connected at a second position, and the fourth section is coated with an insulating layer.

10. A motor controller, characterized in that: The invention comprises a structure for reducing the noise inductance of a motor controller as described in any one of claims 1 to 9.

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