Fixed Structure for Output Terminal of Power Electronic Device of an Electric Machine

Abstract

The present invention discloses a fixed structure for the output end of a power electronic device of a motor, which includes an installation groove for placing the power electronic device and an installation cover. The installation cover is connected in a mating manner with the installation groove. The installation cover is provided with contact elastic pieces and output terminal posts connected to an external rectifying circuit. The contact elastic pieces and the output terminal posts are connected to the corresponding input and output ports of the power electronic device. The connection mode between the installation groove and the installation cover at the output terminal post is tightly connected by a bolt or a pin structure. The axis of the bolt or the pin structure intersects and is perpendicular to the axis of the output terminal post. The processing technology of the present invention is simple, the installation is convenient, and it has strong versatility and higher stability.

Description

Technical Field

[0001] The present invention relates to a fixed structure for the output end of a power electronic device of a motor, belonging to the field of motor drive applications. Background Art

[0002] A motor can convert the rotation of an induction rotor driven by an engine into an induced current in the induction coils of a polyphase stator; this stator generally includes three phase windings, so the generator is a three-phase generator; the three induced phases are connected to a rectifier bridge; this rectifier bridge includes three branches, and each branch includes at least two diodes connected to each phase; however, these diodes generate heat; therefore, the rectifier bridge should be cooled to prevent the diodes from overheating.

[0003] In the prior art, generally, the above-mentioned diodes and rectifier circuit are formed into a power electronic device, and the power electronic device is placed in an insulating housing (the housing includes a cavity and its cover, etc.). By setting the input and output ends of the power electronic device on the housing to connect to the corresponding circuits of the engine, for convenient and reliable connection and stability, generally, the output end of the power electronic device is made into a threaded columnar structure, and its material uses materials with strong conductivity, low cost, such as aluminum and copper. After the power electronic device is placed and its connection position is connected, bolts are used to connect the cavity and its cover into one body to protect the power electronic device, and the bolts are generally tightened in the same direction.

[0004] During use, the output current of the output end of the power electronic device is relatively large. However, in a motor or engine, due to the presence of a permanent magnet, a magnetic field is formed at the output end of the power electronic device. Under the action of the current, a strong torque is formed at the output end of the power electronic device. During long-term use, this strong torque will continuously act on the housing of the output end repeatedly, which will cause damage to the housing of the output end of the power electronic device, and the risk of later leakage and even damage to the power electronic device. Therefore, there is an urgent need for a structure that can make the installation and disassembly of the power electronic device convenient and can well ensure the structural stability and firmness of the output end of the power electronic device. Summary of the Invention

[0005] The purpose of the present invention is to provide a fixed structure for the output end of a power electronic device of a motor, which solves the problem of unstable and unreliable connection at this place by creatively changing the structure of the output end of the power electronic device, so as to overcome the deficiencies of the prior art.

[0006] Technical Solution of the Present Invention

[0007] A fixed structure for the output end of a power electronic device of a motor, comprising an installation groove for placing the power electronic device and an installation cover, which are connected in a matching manner. By setting the installation cover, the pre-installation of the power electronic device is convenient, and the replacement in the later stage is also very convenient;

[0008] Contact elastic pieces and output terminal posts connected to an external rectifying circuit are arranged on the installation cover, and the contact elastic pieces and output terminal posts are connected to the corresponding input and output ports of the power electronic device; by arranging the contact elastic pieces and output terminal posts on the installation cover, the power electronic device is relatively independent, and the connection with the contact elastic pieces and output terminal posts is a contact connection, so the maintenance and replacement of the power electronic device in the later stage are very convenient; at the same time, since the contact elastic pieces and output terminal posts are arranged on the installation cover, all the necessary connection lines can be pre-installed in the installation cover and form an integral body with the installation cover. Those necessary connection lines can be made of thin aluminum strips with strong conductivity and low cost, so that they can be integrally manufactured with the cover plate in the early stage, and the connection lines have higher reliability, will not cause damage and leakage of the connection lines, improve safety, and the manufacturing cost is also low.

[0009] The connection mode between the installation groove and the installation cover at the output terminal post adopts a bolt or pin structure for fastening connection. Preferably, the bolt connection mode is selected because the bolt connection can realize the prior knowledge of the full range of freedom of the installation cover, while the pin structure cannot limit the freedom degree in the axial direction of the pin and needs to be used in cooperation with the existing structure;

[0010] The axis of the bolt or pin structure intersects and is perpendicular to the axis of the output terminal post.

[0011] Preferably, the matching mode of the installation groove and the installation cover adopts at least a three-point fixed connection mode to form at least one triangular stable structure, wherein the fixed points are realized by bolt or pin structures, and at least one bolt or pin structure is located at the output terminal post, and the axes of the remaining bolt or pin structures are parallel to the axis of the output terminal post.

[0012] Preferably, the matching mode of the installation groove and the installation cover can also adopt a three-point fixed connection mode to form a triangular stable structure, wherein two points are hinge structures to enable the installation cover to rotate freely along the hinge points, and the other point is a bolt or pin structure and is located at the output terminal post.

[0013] Preferably, the structure for making the axes of the bolt or pin structure and the output end post cross and be perpendicular to each other includes a connecting plug plate located in the opposite direction of the output end post. A connecting hole is provided on the connecting plug plate, and the axis of the connecting hole crosses and is perpendicular to the axis of the output end post. A bolt hole corresponding to the position of the connecting hole is provided on the installation groove. After the bolt or pin structure passes through the connecting hole, it is connected with the bolt hole in a matching manner. In the prior art, multiple bolts are used to fix the cover body, and the axial directions of all the bolts are the same. Moreover, due to the size limitation and connection relationship at the output end post, the distance between the bolt and the output end post is relatively far, and it is impossible to coincide with the axial direction of the output end post. If the axial directions of all the bolts are parallel to the axis of the output end post, the torque generated by the output end post can only be resisted by the C section of the bolt. If the axial directions of all the bolts are perpendicular to the axis of the output end post and do not intersect, first, this structure makes the cover body structure complex and inconvenient to manufacture, and the force in the axial direction of the output end post can only be resisted by the C section of the bolt. However, after adopting the present application, the force in the axial direction of the cover body or the output end post can be overcome by bolts or hinges parallel to the output end post. In particular, the force-bearing surface of the bolt parallel to the output end post is the D surface at this time, and the force-bearing area is much larger than the force-bearing area of the C surface. At the same time, there is at least one bolt whose axis is perpendicular and crosses the axis of the output end post. Since the direction of the torque formed at the output end post is around the axis of the output end post (either clockwise or counterclockwise), and the axis of the bolt is perpendicular and crosses the axis of the output end post, this torque must be entirely borne on the D surface of the bolt. Compared with the prior art, the force-bearing area of the D surface is much larger than the force-bearing area of the C surface, so it is more stable and reliable. Moreover, the bolts are perpendicular to each other, so even if the bolts are worn or deformed later, it will not cause relative displacement of the installation cover and the output end, so the connection is very reliable (in the prior art, the bolt directions are the same, and it is very easy for the bolts to be worn or deformed and cause displacement).

[0014] Preferably, a positioning hole is provided on the installation cover on one side of the connecting plug plate, and a positioning pin is provided on the installation groove on one side of the bolt hole. With the positioning hole and the positioning pin, the installation is made more rapid and convenient.

[0015] Preferably, a drainage cooling strip is provided on the bottom surface of the installation groove, and a channel surrounded by the drainage cooling strip and the bottom surface of the installation groove is formed. By forming the channel 12, under the action of the fan, the cooling air can quickly cool the installation groove 1 along the channel 12 through the hollow structure, so as to achieve the purpose of dissipating heat from the power electronic device.

[0016] Due to the adoption of the above technical solutions, compared with the prior art, the processing technology of the present invention is simple, the installation is convenient, and it has strong versatility and higher stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Appendix Figure 1 is the main structural view of the present invention;

[0018] Attached Figure 2 Is the attached Figure 1 Top view;

[0019] Attached Figure 3 Is the attached Figure 2 A - A cross-sectional view;

[0020] Attached Figure 4 Is the attached Figure 2 Partial B cross-sectional view;

[0021] Attached Figure 5 Is the schematic of the force-bearing surface of the bolt Figure 1 ;

[0022] Attached Figure 6 Is the schematic of the force-bearing surface of the bolt Figure 2 .

[0023] The markings in the attached drawings are: 1 - mounting groove, 2 - mounting cover, 3 - contact spring piece, 4 - output terminal post, 5 - bolt or pin structure, 6 - connecting plug board, - connecting hole, 8 - threaded hole, 9 - positioning hole, 10 - positioning pin. Detailed implementation mode

[0024] The present invention will be further described in detail below with reference to the attached drawings, but it does not constitute any limitation to the present invention.

[0025] Embodiment 1. As shown in the attached Figures 1-6 , a fixed structure for the output end of a power electronic device of a motor according to the present invention includes a mounting groove 1 for placing the power electronic device and a mounting cover 2. The mounting cover 2 is cooperatively connected with the mounting groove 1. By setting the mounting cover, the pre-installation of the power electronic device is convenient, and the later replacement is also very convenient; the cooperation mode between the mounting groove 1 and the mounting cover 2 adopts a three-point fixed connection mode to form a triangular stable structure, where the fixed points are realized by the bolt structure 5, and one of the bolts 5 is located at the output terminal post 4, and the axes of the remaining bolts 5 are parallel to the axis of the output terminal post 4.

[0026] The connection mode between the mounting groove 1 and the mounting cover 2 at the output terminal post 4 adopts a bolt 5 for fastening connection. Because bolt connection can achieve full-range freedom prediction of the mounting cover 2, while the pin structure cannot limit the freedom in the direction of the pin axis and requires the cooperation of an existing structure to be used. The axis of the bolt 5 intersects and is perpendicular to the axis of the output terminal post 4.

[0027] The structure that enables the axis of the bolt or pin structure 5 to intersect and be perpendicular to the axis of the output end post 4 includes a connecting insertion plate 6 located in the opposite direction of the output end post 4. A connecting hole 7 is provided on the connecting insertion plate 6, and the axis of the connecting hole 7 intersects and is perpendicular to the axis of the output end post 4. A bolt hole 8 corresponding to the position of the connecting hole 7 is provided on the mounting groove 1. After the bolt or pin structure 5 passes through the connecting hole 7, it is connected in cooperation with the bolt hole 8. In the prior art, multiple bolts are used to fix the cover body, and the axial directions of all the bolts are the same. Moreover, due to the size limitation and connection relationship at the output end post 4, the distance between the bolt and the output end post 4 is relatively far, and it is impossible to achieve coincidence with the axial direction of the output end post 4. If the axial directions of all the bolts are parallel to the axis of the output end post 4, the torque generated by the output end post 4 can only be resisted by the C section of the bolt. If the axial directions of all the bolts are perpendicular to the axis of the output end post 4 and do not intersect, first, this structure makes the cover body structure complex and inconvenient to manufacture, and the force in the axial direction of the output end post 4 can only be resisted by the C section of the bolt. However, after adopting this application, the force in the axial direction of the cover body or the output end post 4 can be overcome by bolts or hinges parallel to the output end post 4. In particular, the stress surface of the bolt parallel to the output end post 4 is the D surface at this time, and the stress area is much larger than the stress area of the C surface. At the same time, there is also a bolt whose axis is perpendicular and intersects with the axis of the output end post 4. Since the torque direction formed at the output end post 4 is around the axis of the output end post 4 (either clockwise or counterclockwise), and the axis of the bolt is perpendicular and intersects with the axis of the output end post 4, this torque must be fully stressed on the D surface of the bolt. Compared with the prior art, the stress area of the D surface is much larger than the stress area of the C surface, so it is more stable and reliable. Moreover, the bolts are perpendicular to each other, so even if the bolts are worn or deformed later, it will not cause relative displacement of the mounting cover and the output end. Therefore, the connection is very reliable (in the prior art, the bolt directions are the same, and it is very easy to cause displacement after bolt wear or deformation).

[0028] A positioning hole 9 is provided on the mounting cover 2 on one side of the connecting insertion plate 6, and a positioning pin 10 is provided on the mounting groove 1 on one side of the bolt hole 8. The positioning hole 9 and the positioning pin 10 make the installation more rapid and convenient by setting the positioning hole 9.

[0029] On the mounting cover 2, there are contact elastic pieces 3 and output terminal posts 4 connected to an external rectifying circuit. The contact elastic pieces 3 and output terminal posts 4 are connected to the corresponding input and output ports of the power electronic device. By arranging the contact elastic pieces 3 and output terminal posts 4 on the mounting cover 2, the power electronic device is relatively independent, and the connection with the contact elastic pieces 3 and output terminal posts 4 is a contact connection. In this way, the maintenance and replacement of the power electronic device in the later stage are very convenient. At the same time, the contact elastic pieces 3 and output terminal posts 4 are arranged on the mounting cover 2, so that those necessary connection lines can be pre-installed in the mounting cover 2 and form an integral body with the mounting cover 2. Those necessary connection lines can be made of thin aluminum strips with strong conductivity and low cost. In this way, they can be manufactured integrally with the cover plate in the early stage, and the connection lines have higher reliability, will not cause damage and leakage of the connection lines, improve safety, and have low manufacturing costs.

[0030] On the bottom surface of the installation groove 1, a drainage cooling strip 11 is arranged, and a channel 12 surrounded by the drainage cooling strip 11 and the bottom surface of the installation groove 1 is formed. By forming the channel 12, under the action of the fan, the cooling air can quickly cool the installation groove 1 along the channel 12 through the hollow structure, so as to achieve the purpose of dissipating heat from the power electronic device.

[0031] Embodiment 2: As shown in the appendix Figures 1-6 As shown in the figure, a fixed structure for the output end of a power electronic device of a motor includes an installation groove 1 for placing the power electronic device and a mounting cover 2. The mounting cover 2 is connected to the installation groove 1 in a matching manner. By setting the mounting cover, the installation of the power electronic device in the early stage is convenient, and the replacement in the later stage is also very convenient. The matching method of the installation groove 1 and the mounting cover 2 adopts a three-point fixed connection method to form a triangular stable structure. Two of them are hinge structures, so that the mounting cover 2 can rotate freely along the hinge points. This structure can also adopt a rotating shaft structure, that is, a rotating shaft is arranged on the mounting cover 2, and a rotating cylinder is arranged at the corresponding position of the installation groove. The rotating cylinder is sleeved on the rotating shaft to realize the free movement of the mounting cover. There are many prior arts for this structural principle, so they will not be described one by one. The other point is connected by a bolt structure 5 and is located at the output terminal post 4. The axis of the bolt 5 intersects and is perpendicular to the axis of the output terminal post 4.

[0032] The structure that enables the axis of the bolt or pin structure 5 and the axis of the output end post 4 to intersect and be perpendicular to each other includes a connecting plug plate 6 located in the opposite direction of the output end post 4. A connecting hole 7 is provided on the connecting plug plate 6, and the axis of the connecting hole 7 intersects and is perpendicular to the axis of the output end post 4. A bolt hole 8 corresponding to the position of the connecting hole 7 is provided on the mounting groove 1. The bolt or pin structure 5 passes through the connecting hole 7 and is connected in cooperation with the bolt hole 8. In the prior art, multiple bolts are used to fix the cover body, and the axial directions of all the bolts are the same. Moreover, due to the dimensional limitations and connection relationship at the output end post 4, the distance between the bolt and the output end post 4 is relatively far, and it is impossible to achieve coincidence with the axial direction of the output end post 4. If the axial directions of all the bolts are parallel to the axis of the output end post 4, the torque generated by the output end post 4 can only be resisted by the C section of the bolt. If the axial directions of all the bolts are perpendicular to the axis of the output end post 4 and do not intersect, firstly, this structure makes the cover body structure complex and inconvenient to manufacture, and the force in the axial direction of the output end post 4 can only be resisted by the C section of the bolt. However, after adopting the present application, the force in the axial direction of the cover body or the output end post 4 can be overcome by bolts or hinges parallel to the output end post 4. In particular, the force-bearing surface of the bolt parallel to the output end post 4 is the D surface at this time, and the force-bearing area is much larger than the force-bearing area of the C surface. At the same time, there is a bolt whose axis is perpendicular and intersects with the axis of the output end post 4. Since the torque direction formed at the output end post 4 is around the axis of the output end post 4 (either clockwise or counterclockwise), and the axis of the bolt is perpendicular and intersects with the axis of the output end post 4, this torque must be fully borne on the D surface of the bolt. Compared with the prior art, the force-bearing area of the D surface is much larger than the force-bearing area of the C surface, so it is more stable and reliable. Moreover, the bolts are perpendicular to each other, so even if the bolts are worn or deformed later, it will not cause relative displacement of the mounting cover and the output end. Therefore, the connection is very reliable (in the prior art, the bolt directions are the same, and it is very easy for the bolts to cause displacement after wear or deformation).

[0033] A positioning hole 9 is provided on the mounting cover 2 on one side of the connecting plug plate 6, and a positioning pin 10 is provided on the mounting groove 1 on one side of the bolt hole 8. The positioning hole 9 and the positioning pin 10 make the installation more rapid and convenient by providing the positioning hole 9.

[0034] On the mounting cover 2, there are contact spring pieces 3 and output terminal posts 4 connected to an external rectifying circuit. The contact spring pieces 3 and output terminal posts 4 are connected to the corresponding input and output ports of the power electronic device. By arranging the contact spring pieces 3 and output terminal posts 4 on the mounting cover 2, the power electronic device is relatively independent, and the connection with the contact spring pieces 3 and output terminal posts 4 is a contact connection. In this way, the later maintenance and replacement of the power electronic device are very convenient. At the same time, the contact spring pieces 3 and output terminal posts 4 are arranged on the mounting cover 2, so that those necessary connection lines can be pre-installed in the mounting cover 2 and form an integral body with the mounting cover 2. Those necessary connection lines can be made of thin aluminum strips with strong conductivity and low cost. In this way, they can be manufactured integrally with the cover plate in the early stage, and the reliability of the modified connection lines is higher, which will not cause damage and leakage of the connection lines, improves safety, and the manufacturing cost is also low.

[0035] On the bottom surface of the mounting groove 1, a drainage cooling strip 11 is provided, and a channel 12 surrounded by the drainage cooling strip 11 and the bottom surface of the mounting groove 1 is formed. By forming the channel 12, under the action of the fan, the cooling air can quickly cool the mounting groove 1 along the channel 12 through the hollow structure, so as to achieve the purpose of dissipating heat from the power electronic device.

[0036] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fixed structure for the output end of a power electronic device of a motor, comprising an installation groove (1) for placing the power electronic device and an installation cover (2), and the installation cover (2) is cooperatively connected with the installation groove (1). Characterized in that: The installation cover (2) is provided with a contact elastic piece (3) and an output terminal post (4) connected to an external rectifying circuit, and the contact elastic piece (3) and the output terminal post (4) are connected to the corresponding input and output ports of the power electronic device. At the output terminal post (4), the connection mode between the installation groove (1) and the installation cover (2) adopts a bolt or pin structure (5) for fastening connection. The axis of the bolt or pin structure (5) intersects and is perpendicular to the axis of the output terminal post (4). The cooperation mode between the installation groove (1) and the installation cover (2) adopts at least a three-point fixed connection mode to form at least one triangular stable structure, where the fixed points are realized by the bolt or pin structure (5), and at least one bolt or pin structure (5) is located at the output terminal post (4), and the axes of the remaining bolt or pin structures (5) are parallel to the axis of the output terminal post (4). Or the cooperation mode between the installation groove (1) and the installation cover (2) adopts a three-point fixed connection mode to form a triangular stable structure, where two points are hinge structures so that the installation cover (2) can freely rotate along the hinge points, and the other point is a bolt or pin structure (5) and is located at the output terminal post (4).

2. A fixed structure for the output end of a power electronic device of a motor according to claim 1. Characterized in that: The structure for realizing the axes of the bolt or pin structure (5) and the output terminal post (4) to intersect and be perpendicular to each other includes a connecting plug board (6) located in the opposite direction of the output terminal post (4). A connecting hole (7) is provided on the connecting plug board (6), and the axis of the connecting hole (7) intersects and is perpendicular to the axis of the output terminal post (4). A bolt hole (8) corresponding to the position of the connecting hole (7) is provided on the installation groove (1), and the bolt or pin structure (5) passes through the connecting hole (7) and is cooperatively connected with the bolt hole (8).

3. A fixed structure for the output end of a power electronic device of a motor according to claim 2. Characterized in that: A positioning hole (9) is provided on the installation cover (2) on one side of the connecting plug board (6), and a positioning pin (10) is provided on the installation groove (1) on one side of the bolt hole (8), and the positioning hole (9) and the positioning pin (10).

4. A fixed structure for the output end of a power electronic device of a motor according to claim 1. Characterized in that: A drainage cooling strip (11) is provided on the bottom surface of the installation groove (1), and a channel (12) surrounded by the drainage cooling strip (11) and the bottom surface of the installation groove (1).

Images