An electric machine

Abstract

The application discloses a motor, comprising a shell, a connector and an electrical connecting piece, the shell has a mounting inner cavity, and a connecting hole in communication with the mounting inner cavity is formed; the connector comprises a seat body and a grounding terminal arranged on the seat body, the seat body is used for being fixedly mounted to an outer wall of the shell, the grounding terminal has a plug-in end and an abutting end, the plug-in end extends to a side of the seat body away from the shell, and the abutting end extends to a side of the seat body towards the shell; the abutting end corresponds to the position of the connecting hole; the electrical connecting piece is used for entering the connecting hole from the mounting inner cavity and abutting against the abutting end located outside the connecting hole, so as to realize electrical connection between the shell and the grounding terminal. Since the electrical connecting piece is connected in abutment with the abutting end of the grounding terminal through the connecting hole, compared with the mode that a wire is used to connect the grounding terminal and the shell in the prior art, the problem that the sealing performance of the motor is affected by the excessively long wire can be avoided, and the stability of the connection between the grounding terminal and the shell is improved.

Description

Technical Field

[0001] This application relates to the field of motor technology, specifically to a motor that can improve the stability of grounding terminal connection. Background Technology

[0002] As power output devices, electric motors are widely used in automated equipment, which places higher demands on their protection performance. Among these, the grounding of the motor is crucial in the design of its protection performance; improper or unreliable grounding can easily lead to accidents such as electric shock and interference.

[0003] Motors are typically used in conjunction with connectors. These connectors connect the servo unit's cable to the motor's internal circuitry, enabling signal transmission between the servo unit and power supply to the motor. However, a separate lead is usually used to connect the motor housing and the grounding terminal on the connector for grounding. Before installing the connector onto the motor housing, the lead must be connected to the motor housing, making the assembly process cumbersome. Furthermore, excessively long leads can create excessive gaps between the connector and the motor housing, affecting the motor's sealing performance, while excessively short leads result in poor electrical contact stability with the motor housing. Utility Model Content

[0004] This application aims to provide a motor that improves the stability of the connection between the grounding terminal and the housing.

[0005] This application provides an electric motor, including:

[0006] The housing has an inner cavity for mounting, and a connection hole communicating with the inner cavity is provided on the housing.

[0007] A connector includes a base and a grounding terminal disposed on the base. The base is used for fixed installation on the outer wall of a housing. The grounding terminal has a plug end and an abutment end. The plug end extends to the side of the base away from the housing, and the abutment end extends to the side of the base facing the housing. The abutment end corresponds to the position of the connection hole.

[0008] An electrical connector is provided for entering the connection hole from the mounting cavity and abutting against the abutting end located outside the connection hole to achieve an electrical connection between the housing and the grounding terminal.

[0009] In some embodiments, the wall of the connecting hole is at least partially provided with an internal thread, and the outer surface of the electrical connector is at least partially provided with an external thread adapted to the internal thread. The electrical connector is screwed to the internal thread of the connecting hole via the external thread to be fixed to the connecting hole.

[0010] In some embodiments, the electrical connector is provided with an operating portion configured to rotate the electrical connector by means of a tool, so that the external thread is screwed into the internal thread.

[0011] In some embodiments, the mounting cavity includes an operating area and a mounting area disposed along the axial direction of the housing, the mounting area being configured to mount a stator assembly, the operating area corresponding to the position of the connecting hole, and the operating area being configured to operate the operating part by means of a tool.

[0012] In some embodiments, the housing extends outward from the opening of the mounting cavity to form a stop, the operating area is close to the stop relative to the mounting area, and the wall thickness of the housing at the stop is less than the wall thickness of the housing at the operating area, so as to form a limiting step between the stop and the operating area, the limiting step being configured to limit the cover mounted on the stop.

[0013] In some embodiments, the length of the connection hole is greater than the length of the electrical connector.

[0014] In some embodiments, one end of the electrical connector and the abutting end is a contact end, and the radial dimension of the contact end is smaller than the radial dimension of the electrical connector body.

[0015] In some embodiments, the projected area of ​​the abutting end is greater than the projected area of ​​the contact end.

[0016] In some embodiments, the base body has a mounting groove on the side facing the housing, and the abutting end is disposed in the mounting groove.

[0017] In some embodiments, the abutment end is an elastic abutment end.

[0018] According to the motor of the above embodiment, since the electrical connector is connected to the grounding terminal by abutting the grounding terminal through the connection hole, compared with the method of connecting the grounding terminal to the housing by a wire in the related art, it can avoid the problem that excessively long wires will cause an excessive gap between the base and the housing, which will affect the sealing performance of the motor, and avoid the problem that excessively short wires will cause poor contact between the grounding terminal and the housing. Thus, while ensuring the sealing performance of the motor, the stability of the connection between the grounding terminal and the housing can also be improved. Attached Figure Description

[0019] Figure 1 A perspective view of the motor provided in this application;

[0020] Figure 2 Exploded view of the motor provided in this application;

[0021] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0022] Figure 4 A cross-sectional view of the motor provided in this application;

[0023] Figure 5 for Figure 4 A magnified view of a portion of point B in the middle;

[0024] Figure 6 The three-dimensional structure of the motor housing provided in this application Figure 1 ;

[0025] Figure 7 The three-dimensional structure of the motor housing provided in this application Figure 2 ;

[0026] Figure 8 The three-dimensional connector in the motor provided in this application Figure 1 ;

[0027] Figure 9 The three-dimensional connector in the motor provided in this application Figure 2 .

[0028] Figure label:

[0029] Motor 100, housing 10, connecting hole 11, internal thread 111, cavity 12, mounting cavity 13, operating area 131, mounting area 132, stop 14, limit step 141, cable outlet 15, connector 20, base 21, mounting groove 211, groove sidewall 212, grounding terminal 22, plug end 221, abutment end 222, extension section 223, power terminal 23, brake terminal 24, electrical connector 30, contact end 31, operating part 32, external thread 33, stator assembly 40, circuit board 41. Detailed Implementation

[0030] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0031] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0032] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0033] This application provides an electric motor, wherein the electric motor is a power output device, mainly composed of a stator assembly and a rotor assembly, and the rotor assembly is driven to rotate by the rotating magnetic field generated by the stator assembly when it is energized.

[0034] See Figures 1-5 As shown, the motor 100 provided in this application includes a housing 10, a connector 20, and an electrical connector 30. The connector 20 is installed on the outer wall of the housing 10. The motor 100 serves as a power output device. A stator assembly and a rotor assembly are installed inside the housing 10. When energized, the stator assembly generates a rotating magnetic field that drives the rotor assembly to rotate, thereby outputting rotational power to a structure connected to the shaft of the rotor assembly, such as driving gears to rotate.

[0035] The housing 10 is typically made of metal and has a certain strength, for example, cast iron. The housing 10 has a mounting cavity 13, in which the stator assembly and rotor assembly (not shown) are partially installed. The housing 10 has a connection hole 11 that communicates with the mounting cavity.

[0036] Connector 20 is a structure that connects the stator assembly 40 inside the housing 10 to the drive unit via a cable, and can supply power to the stator assembly via the cable. Connector 20 includes a base 21 and a grounding terminal 22 disposed on the base 21. The base 21 is used for fixed installation on the outer wall of the housing 10, and the grounding terminal 22 has a plug-in end 221 (e.g., ...). Figure 1 and Figure 8 (as shown) and the abutment end 222 (as shown) Figures 2-5 and Figure 9As shown), the grounding terminal 22 passes through the connecting body 21. For example, the body 21 is provided with a grounding mounting hole, and the grounding terminal 22 is fixed in the mounting hole, so that the plug end 221 extends to the side of the body 21 away from the housing 10, and the abutment end 222 extends to the side of the body 21 facing the housing 10. The abutment end 222 extending to the side of the body 21 facing the housing 10 can be used to maintain an electrical connection with the housing 10 through the electrical connector 30. The plug end 221 extending to the side of the body 21 away from the housing 10 is used to plug into the grounding socket of the plug, thereby achieving the purpose of grounding the motor 100.

[0037] In this embodiment, when the base 21 faces the side of the housing 10, the abutment end 222 of the grounding terminal 22 corresponds to the position of the connection hole 11. The corresponding positional relationship is that the projection of the abutment end 22 and the projection of the connection hole 11 at least partially coincide along the axial direction of the connection hole 11.

[0038] See Figure 8 and Figure 9 As shown, connector 20 also includes power terminals 23 and brake terminals 24. There are three power terminals 23 and two brake terminals 24. Both the two brake terminals 24 and the three power terminals 23 are mounted through the base 21. The two brake terminals 24 and the three power terminals 23 are exposed on both sides of the base 21. The three power terminals 23 exposed on the side of the base 21 facing the housing 10 (U-phase terminal, V-phase terminal, and W-phase terminal, respectively) are connected to the three-phase connection portion (U-phase connection portion, V-phase connection portion, and W-phase connection portion) in the stator assembly 40 via circuit board 41. The two brake terminals 24 exposed on the side of the base 21 facing the housing 10 are connected to a brake device (not shown) located in the mounting cavity 13. The base 21, along with the grounding terminal 22, the three power terminals 23, and the two brake terminals 24 mounted on the base 21, form a socket.

[0039] The driver is connected by a cable, one end of which is a plug. The plug has two brake sockets, three power sockets, and one grounding socket. The U, V, and W wires of the cable are connected to the three power sockets, the two brake power wires are connected to the two brake sockets, and the grounding wire is connected to the grounding socket. By plugging the cable plug into the sockets, one grounding terminal 21, two brake terminals 24, and three power terminals 23 are respectively connected to one grounding socket, two brake sockets, and three power sockets. The driver supplies power to the braking device through the two brake terminals 24 and to the stator assembly 40 through the three power terminals 23, causing the stator assembly 40 to generate an alternating magnetic field that drives the rotor assembly to rotate. The grounding terminal 22 grounds the motor housing 10 to prevent electric shock, interference, and other problems.

[0040] The electrical connector 30 is preferably made of a metal material, such as aluminum alloy or iron, and has a conductive function. The electrical connector 30 is used to enter the connection hole 11 from the mounting cavity 13 and abut against the abutting end 222 of the grounding terminal 22 located outside the connection hole 11 to realize the electrical connection between the housing 10 and the grounding terminal 22. Thus, the electrical connector 30 connects the housing 10 and the grounding terminal 22, further realizing the grounding function of the motor 100.

[0041] In some embodiments, the electrical connector 30 is installed in the connection hole 11 in a manner that allows it to be adjusted to pass through the connection hole 11 in the axial direction. This means that the electrical connector 30 can be adjusted in displacement along the axial direction of the connection hole 11 and is fixed in the connection hole 11 or the housing 10 when the appropriate displacement is reached. The appropriate displacement is the amount of displacement of the electrical connector 30 to contact the abutment end 222. At this time, the electrical connector 30 can move in a telescopic manner along the axial direction of the connection hole 11 to pass through the connection hole 11 and contact the abutment end 222.

[0042] Since the electrical connector 30 is connected to the grounding terminal 222 by abutting through the connection hole 11, compared with the method of connecting the grounding terminal 22 to the housing 10 by a wire in the related technology, it can avoid the problem of excessive gap between the seat 21 and the housing 10 due to excessively long wires, which would affect the sealing performance of the motor 100, and avoid the problem of poor contact between the grounding terminal 22 and the housing 10 due to excessively short wires. Thus, while ensuring the sealing performance of the motor 100, it can also improve the stability of the connection between the grounding terminal 22 and the housing 10.

[0043] In this embodiment, the electrical connector 30 is screwed into the connecting hole 11 so that the electrical connector 30 is connected to the hole wall of the connecting hole 11, thereby achieving an electrical connection between the housing 10 and the electrical connector 30. Furthermore, the electrical connector 30 can be adjusted and displaced along the axial direction of the connecting hole 11 by screwing to abut against the abutting end 222 of the grounding terminal 22 located outside the connecting hole 11, thereby electrically connecting the housing 10 and the grounding terminal 22 through the electrical connector 30.

[0044] See Figure 5 As shown, the wall of the connecting hole 11 is provided with an internal thread 111 at least in part, and the outer surface of the electrical connector 30 is provided with an external thread 33 adapted to the internal thread 111 at least in part. The electrical connector 30 is fixed in the connecting hole 11 by screwing the external thread 33 into the internal thread 111 of the connecting hole 11. As the electrical connector 30 moves in the connecting hole 11, the electrical connector 30 can abut against the abutting end of the grounding terminal 22.

[0045] See Figure 3 and Figure 5As shown, the electrical connector 30 has an operating part 32 at the end away from the abutting end 222. The operating part 32 is configured to rotate the electrical connector 30 by means of a tool so that the external thread 33 is screwed into the internal thread 111, thereby installing the electrical connector 30 in the connecting hole 11.

[0046] The operating part 32 can be a hexagonal socket, a Phillips head slot, a flathead slot, etc., and the corresponding tools are hexagonal wrenches, Phillips head screwdrivers, flathead screwdrivers, etc.

[0047] The radial dimension of the operating part 32 of the electrical connector 30 can be the same as the radial dimension of the electrical connector 30 body (other parts). The connecting hole 11 is a straight cylindrical through hole. The radial dimension of the operating part 32 can also be larger than the radial dimension of the electrical connector 30 body. In this case, the connecting hole 11 can be a countersunk hole, and the operating part 32 can be sunk into the countersunk hole to ensure that the inner wall of the mounting cavity 13 is smooth, which facilitates the installation of the stator assembly 40.

[0048] See Figure 6 and Figure 7 As shown, the mounting cavity 13 includes an operating area 131 and a mounting area 132, which are arranged along the axial direction of the housing 10. (The last two characters are not part of the diagram and can be left as is.) Figure 6 and Figure 7 The operating area 131 and the mounting area 132 are distinguished by a dashed line inside the mounting cavity 13. This dashed line does not represent an actual area within the mounting cavity 13 of the housing 10. The mounting cavity 13 has an opening 12 formed at one end of the housing 10 along the axial direction of the housing 10. The operating area 131 is located closer to the opening 12 than the mounting area 132. The mounting area 132 is configured to mount the stator assembly 40. The operating area 131 corresponds to the position of the connecting hole 11, and it can be assumed that the connecting hole 11 communicates with the operating area 131. The operating area 131 is configured to operate the operating part 32 of the electrical connector 30 using tools. In other words, the operating area 131 provides operating space for the operator to operate the operating part 32 of the electrical connector 30 using tools. By placing the connection hole 11 in the operating area 131, which is thicker than the wall thickness of the stop 14, it is ensured that the connection hole 11 has sufficient length to allow the electrical connector 30 to be fully installed in the connection hole 11, avoiding exposure to the inner wall of the mounting cavity 13 of the housing 10.

[0049] like Figures 1-4 and Figure 6 and Figure 7As shown, a cover is typically installed at the opening 12 of the mounting cavity 13 of the housing 10 to seal the opening 12. To facilitate the installation of the cover, the housing 10 extends outward from the opening 12 of the mounting cavity 13 to form a stop 14. The operating area 131 is closer to the stop 14 than the mounting area 132. The wall thickness of the housing 10 at the stop 14 is less than the wall thickness of the housing 10 at the operating area 131, so as to form a limiting step 141 between the stop 14 and the operating area 131. The cover is installed at the stop 14, and the limiting step 141 is configured to limit the cover installed at the opening 12. See also Figure 6 and Figure 7 As shown, the side wall of the housing 10 also has a cable outlet 15, and the connection hole 11 is located around the cable outlet 15. The seat 21 of the connector 20 is installed at the cable outlet 15 on the side wall of the housing 10. After the connector 20 is installed at the cable outlet 15 of the housing 10, the cable outlet 15 is projected onto the side of the seat 21 of the connector 20 facing the housing 10, where there is a mounting groove 211 (e.g., Figure 9 As shown, the grounding terminal 22 is installed in the mounting slot 211, and the three power terminals 23 and two brake terminals 24 are also installed in the mounting slot 211. The mounting slot 211 is positioned directly opposite the cable outlet 15 to facilitate the connection of the three power terminals 23 and the two brake terminals 24 to the stator assembly 40 and the brake device, respectively. It should be noted that the above-mentioned orthographic projection refers to the projection along the radial direction of the motor.

[0050] See Figure 9 The mounting groove 211 has a groove sidewall 212, which at least partially protrudes from the side of the seat 21 facing the housing 10. After the seat 21 is installed on the outer wall of the housing 10, the portion of the groove sidewall 212 protruding from the seat 21 fits against the outer wall of the housing 10 and surrounds the outlet 15, forming a seal for the outlet 15 to prevent water or dust from entering the interior of the housing 10.

[0051] Of course, in other embodiments, the portion of the groove sidewall 212 that protrudes from the seat 21 can also be inserted into the outlet 15, which can also achieve the function of sealing the outlet 15.

[0052] In some embodiments, the side groove wall 212 may also be made of silicone material, which deforms when squeezed to achieve a better sealing effect.

[0053] In this embodiment, since the grounding terminal 22 is installed in the mounting groove 211 of the base 21, and the connection hole 11 is located on the periphery of the outlet 15, the grounding terminal 22 also has an extension section 223. The extension section 223 is connected between the plug end 221 and the abutment end 222. The extension section 223 allows the plug end 221 to extend to the position corresponding to the connection hole 11.

[0054] In this application, the length of the connection hole 11 is greater than the length of the electrical connector 30, which ensures that the electrical connector 30 can be completely installed in the connection hole 11 and prevents the electrical connector 30 from being exposed on the cavity wall of the mounting cavity 13 of the housing 10.

[0055] In this example, the electrical connector 30 is screwed into the connecting hole 11 by means of an external thread 33 threading into an internal thread 111. The electrical connector 30 is displaced axially along the connecting hole 11 by the screwing connection to abut against the abutment end 222 of the grounding terminal 22 located outside the connecting hole 11. The end of the electrical connector 30 abutting against the abutment end 222 is a contact end 31, which abuts against the abutment end 222, thereby connecting the electrical connector 30 to the grounding terminal 22. The electrical connector 30 is connected to the wall of the connecting hole 11. After the contact end 31 of the electrical connector 30 abuts against the abutment end 222 of the grounding terminal 22, the grounding terminal 22 is connected to the housing 10 via the electrical connector 30 through the connection between the electrical connector 30 and the wall of the connecting hole 11.

[0056] During the process of contacting the grounding terminal 222 with the contact end 31, in order to ensure that the contact end 31 can fully abut against the abutment end 222, the radial dimension of the contact end 31 is set to be smaller than the radial dimension of the electrical connector 30 body. The contact end 31 is preferably formed in a conical shape, forming a point contact with the abutment end 222. Of course, the contact end 31 and the abutment end 222 can also be in surface contact.

[0057] In one embodiment of this application, the projected area of ​​the abutment end 222 is larger than the projected area of ​​the contact end 31, so that the contact end 31 can completely abut the abutment end 222, thereby ensuring the stability of the connection between the electrical connector 30 and the grounding terminal 22.

[0058] To ensure a more stable contact between the contact end 31 and the abutment end 222, the abutment end 222 can be set as an elastic abutment end. After the contact end 31 abuts against the abutment end 222, the electrical connector 30 is continued to be screwed in the connection hole 11, so that the contact end 31 continues to move toward the abutment end 222. The elastic abutment end undergoes elastic deformation to abut against the contact end 31 more stably.

[0059] In summary, in the motor provided by this application, since the electrical connector is connected to the grounding terminal by abutting the connection hole, compared with the method of connecting the grounding terminal to the housing by a wire in the related technology, it can avoid the problem of excessive gap between the base and the housing due to excessively long wires, which would affect the sealing performance of the motor, and avoid the problem of poor contact between the grounding terminal and the housing due to excessively short wires. Thus, while ensuring the sealing performance of the motor, it can also improve the stability of the connection between the grounding terminal and the housing.

[0060] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. An electric motor, characterized in that, include: The housing has an inner cavity for mounting, and a connection hole communicating with the inner cavity is provided on the housing. A connector includes a base and a grounding terminal disposed on the base. The base is used for fixed installation on the outer wall of a housing. The grounding terminal has a plug end and an abutment end. The plug end extends to the side of the base away from the housing, and the abutment end extends to the side of the base facing the housing. The abutment end corresponds to the position of the connection hole. An electrical connector is provided for entering the connection hole from the mounting cavity and abutting against the abutting end located outside the connection hole to achieve an electrical connection between the housing and the grounding terminal.

2. The motor as described in claim 1, characterized in that, The wall of the connecting hole is at least partially provided with an internal thread, and the outer surface of the electrical connector is at least partially provided with an external thread adapted to the internal thread. The electrical connector is screwed to the internal thread of the connecting hole through the external thread to fix it to the connecting hole.

3. The motor as described in claim 2, characterized in that, The electrical connector is provided with an operating part, which is configured to rotate the electrical connector by means of a tool so that the external thread is screwed into the internal thread.

4. The motor as described in claim 3, characterized in that, The mounting cavity includes an operating area and a mounting area arranged along the axial direction of the housing. The mounting area is configured to mount the stator assembly. The operating area corresponds to the position of the connecting hole and is configured to operate the operating part using a tool.

5. The motor as described in claim 4, characterized in that, The housing extends outward from the opening of the mounting cavity to form a stop. The operating area is close to the stop relative to the mounting area. The wall thickness of the housing at the stop is less than the wall thickness of the housing at the operating area, so as to form a limiting step between the stop and the operating area. The limiting step is configured to limit the cover installed at the stop.

6. The motor as described in any one of claims 1-5, characterized in that, The length of the connecting hole is greater than the length of the electrical connector.

7. The motor as described in any one of claims 1-5, characterized in that, The end of the electrical connector that abuts against the abutting end is the contact end, and the radial dimension of the contact end is smaller than the radial dimension of the electrical connector body.

8. The motor as described in claim 7, characterized in that, The projected area of ​​the abutting end is greater than the projected area of ​​the contact end.

9. The motor as described in any one of claims 1-5, characterized in that, The base body has a mounting groove on the side facing the housing, and the abutting end is disposed in the mounting groove.

10. The motor according to any one of claims 1-5, characterized in that, The abutment end is an elastic abutment end.

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