Motor

Abstract

The utility model relates to a motor, which comprises a shell, a stator winding, a stator core, a stator core, a rotor core and a rotor core, and is characterized in that the shell is provided with a wire outlet; the live wire is electrically communicated with the wire outlet end of the stator winding, and the live wire penetrates out of the shell from the wire outlet hole; one end of the ground wire is fixed and electrically communicated with the shell; the ground wire is provided with a surrounding section, at least part of the surrounding section is located in the wire outlet hole, the surrounding section is wound on the live wire, and the live wire is isolated from the hole wall of the wire outlet hole. And the surrounding section isolates the live wire from the hole wall of the wire outlet hole, so that the situation that the live wire rubs the hole wall of the wire outlet hole is avoided, the live wire is protected, the problem of poor voltage resistance of the motor is prevented, and the reliability of the motor can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, and in particular to an electric machine. BACKGROUND

[0002] An electric machine is a device that converts electrical energy into mechanical energy, and is widely used in various mechanical devices, automation systems, and household appliances. The electric machine includes a housing, which is provided with a wire outlet hole for passing a power line. The power line has a hot wire. The hot wire passes through the wire outlet hole, and there is a situation that the hot wire is rubbed against the hole wall of the wire outlet hole, which may damage the insulation layer wrapped outside the hot wire, resulting in poor voltage resistance of the electric machine. CONTENT OF THE UTILITY MODEL

[0003] The present application provides an electric machine, which can solve the problem of poor voltage resistance of the electric machine.

[0004] According to an aspect of the present application, an embodiment provides an electric machine, characterized in that it comprises:

[0005] a housing, the housing being provided with a wire outlet hole, and the housing being provided with a stator winding inside;

[0006] a hot wire, the hot wire being in electrical communication with the wire outlet end of the stator winding, and the hot wire passing out of the housing from the wire outlet hole;

[0007] a ground wire, one end of the ground wire being fixed and in electrical communication with the housing, and the ground wire having a winding segment, at least part of the winding segment being located in the wire outlet hole, and the winding segment being wound around the hot wire to isolate the hot wire from the hole wall of the wire outlet hole.

[0008] In one embodiment, the electric machine is a three-phase alternating current electric machine, and the three-phase alternating current electric machine includes three hot wires, and the winding segment winds around the three hot wires together.

[0009] In one embodiment, the winding segment winds around the hot wire at least one turn.

[0010] In one embodiment, the winding height of the winding segment is greater than or equal to the height of the wire outlet hole.

[0011] In one embodiment, the hole wall of the wire outlet hole is provided with a mounting portion, one end of the ground wire is connected and fixed with the mounting portion to form electrical communication between the ground wire and the housing.

[0012] In one embodiment, the mounting portion is a protrusion provided on the hole wall of the wire outlet hole, one end of the ground wire is connected and fixed with the protrusion, and the other end of the ground wire is in electrical communication with a socket provided outside the housing.

[0013] In one embodiment, the protrusion is provided with a mounting hole, one end of the ground wire is provided with a connecting head, the connecting head is provided with a through hole, the connecting head is matched with the mounting hole through a screw passing through the through hole, and the connection and fixation between the ground wire and the protrusion are formed.

[0014] Alternatively, one end of the ground wire is connected and fixed with the protrusion through welding.

[0015] In one embodiment, the connecting head is in a sheet shape, the protrusion has a plane, the axis of the mounting hole is perpendicular to the plane, and the screw is matched with the mounting hole through the through hole on the sheet-shaped connecting head, so that the connecting head and the protrusion are connected and fixed.

[0016] In one embodiment, the plane extends perpendicularly to the extending direction of the axis of the outlet hole, and a spacing for accommodating the connecting head is left between the plane and the outer side hole of the outlet hole.

[0017] In one embodiment, a metal elastic pad is arranged between the connecting head and the plane, the metal elastic pad has a notch, and the portions of the metal elastic pad on both sides of the notch have a height difference in a natural state, which is used to generate elastic deformation for reducing the height difference when the screw is screwed in.

[0018] According to the motor of the above-mentioned embodiment, the ground wire has a surrounding segment, at least part of the surrounding segment is located in the outlet hole, and the surrounding segment is arranged around the live wire to isolate the live wire from the hole wall of the outlet hole. The surrounding segment isolates the live wire from the hole wall of the outlet hole, which is beneficial to avoid the situation that the live wire scratches the hole wall of the outlet hole, forms protection for the live wire, is beneficial to prevent the occurrence of poor voltage resistance problem of the motor, and can improve the reliability of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the motor of one embodiment;

[0020] Figure 2 It is a structural schematic diagram of the surrounding segment arranged around the live wire of one embodiment;

[0021] Figure 3 It is a structural schematic diagram of the ground wire of one embodiment;

[0022] Figure 4 It is a structural schematic diagram of the shell provided with the outlet hole of one embodiment;

[0023] Figure 5 It is an A enlarged view of one embodiment of Figure 4

[0024] Explanation of reference signs:

[0025] ​1-Housing; 101-Outlet hole; 102-Protrusion; 103-Mounting hole; 104-Flat surface; 2-Live wire; 3-Ground wire; 301-Connector; 302-Wrap-around section; 303-Through hole; 4-Socket. Detailed Implementation

[0026] 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.

[0027] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0028] 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).

[0029] In related technologies, a motor includes a housing with an outlet hole for power lines to pass through. The power lines include a live wire and a ground wire, with the live wire electrically connecting the stator windings to a socket on the housing. As the live wire passes through the outlet hole, there is a possibility of friction between the live wire and the hole wall, potentially damaging the insulation layer and causing poor motor withstand voltage. In this application, a winding section on the ground wire isolates the live wire from the outlet hole wall, thus solving the problem of poor motor withstand voltage caused by friction.

[0030] Please see Figures 1 to 5 This application provides an embodiment of an electric motor, including a housing 1, a stator winding, a socket 4, a live wire 2, a ground wire 3, and other functional components as needed, which are described in detail below.

[0031] likeFigure 1 As shown, in this embodiment, the housing 1 is provided with a wire outlet hole 101, and a stator winding is provided inside the housing 1. The housing 1 in this embodiment can be, but is not limited to, a metal housing 1 with conductive properties. The wire outlet hole 101 provided on the housing 1 can be a circular hole, a square hole, or a through hole of other shapes. This embodiment does not limit the specific arrangement inside the housing 1, as long as it can realize the operation of the motor. For example, a stator and a rotor can be provided inside the housing 1. The stator is fixed to the housing 1, and the rotor is rotatably connected to the housing 1 through a bearing. The stator includes a stator core and a stator winding.

[0032] In this embodiment, the live wire 2 is electrically connected to the output terminal of the stator winding, and the live wire 2 passes through the output hole 101 and exits the housing 1. One end of the live wire 2 passing through the output hole 101 and exiting the housing 1 can be electrically connected to the socket 4 outside the housing 1. The live wire 2 serves as a power supply line to provide power to the stator winding. This embodiment does not limit the specific connection method between the live wire 2 and the output terminal of the stator winding; any method that achieves electrical connection is acceptable. In this embodiment, the live wire 2 can be, but is not limited to, three live wires 2, including U live wire 2, V live wire 2, and W live wire 2.

[0033] like Figure 2 As shown, in this embodiment, one end of the ground wire 3 is fixed to and electrically connected to the housing 1; the ground wire 3 has a surrounding section 302, at least a portion of which is located in the outlet hole 101. The surrounding section 302 is wound around the live wire 2, isolating the live wire 2 from the hole wall of the outlet hole 101. The motor achieves grounding of the housing 1 through the ground wire 3, which is beneficial to improving the safety of motor operation. In this embodiment, the ground wire 3 has a surrounding section 302 wound around the live wire 2, and at least a portion of which is located in the outlet hole 101. This can form protection for the live wire 2, which is beneficial to avoid the motor's poor withstand voltage due to friction between the live wire 2 and the hole wall of the outlet hole 101, thus improving the reliability of the motor. In this embodiment, the surrounding section 302 can be wrapped snugly around the live wire 2. In some embodiments, a gap may also be left between the surrounding section 302 and the live wire 2, that is, the live wire 2 still has a certain amount of room to move within the surrounding section 302, which is beneficial to the assembly and subsequent maintenance of the live wire 2.

[0034] In one embodiment, the motor is a three-phase AC motor, which includes three live wires 2, and a winding section 302 surrounds all three live wires 2 together. The three live wires 2 can be U live wire 2, V live wire 2, and W live wire 2. The winding section 302 surrounds all three live wires 2 together, which is a simple winding method and facilitates assembly. In some embodiments, the winding section 302 can also surround each live wire 2 separately. In some application scenarios, the number of live wires 2 can also be two, or more than three. In some application scenarios, other wires extending from the outlet hole 101 in the motor (such as brake wires) can also be surrounded by a ground wire 3 to isolate them from the housing 1, as needed.

[0035] In one embodiment, the surrounding segment 302 surrounds the live wire 2 at least once. When it surrounds one or more times, the surrounding segment 302 provides better protection for the live wire 2, and the isolation effect between the live wire 2 and the housing 1 is also better. When the surrounding segment 302 surrounds multiple times, it can be in a spiral shape. In some embodiments, the surrounding segment 302 may not complete a full turn; for example, it may wrap around more than half a turn. Even when it wraps around more than half a turn, the surrounding segment 302 still serves to isolate the live wire 2 from the housing 1.

[0036] In one embodiment, the height of the surrounding section 302 is greater than or equal to the height of the outlet hole 101. In this embodiment, the height of the surrounding section 302 is the height of the outer shape after the ground wire 3 is wrapped around it, that is, the length of the live wire 2 wrapped by the ground wire 3. When the height of the surrounding section 302 is greater than or equal to the height of the outlet hole 101, the surrounding section 302 has a better effect in isolating the live wire 2 from the hole wall of the outlet hole 101, which is more conducive to improving the reliability of the motor. In some embodiments, the height of the surrounding section 302 may also be less than the height of the outlet hole 101. In this case, the surrounding section 302 still has the function of isolating the live wire 2 from the housing 1. In this embodiment, the minimum height of the surrounding section 302 is the line width of the ground wire 3, for example, when the surrounding section 302 is wrapped around one or more than half a turn.

[0037] In one embodiment, the wall of the outlet hole 101 is provided with a mounting part, and one end of the ground wire 3 is connected and fixed to the mounting part to form an electrical connection between the ground wire 3 and the housing 1. The ground wire 3 is directly connected and fixed to the mounting part on the hole wall, which helps to reduce the length of the ground wire 3 and the arrangement of the ground wire 3. Moreover, there is no need to provide a ground wire 3 connection part on the outside of the housing 1, which helps to improve the sealing performance of the motor.

[0038] In one embodiment, such as Figure 4 , Figure 5As shown, the mounting part can be a protrusion 102 provided on the wall of the outlet hole 101. One end of the ground wire 3 is connected and fixed to the protrusion 102, and the other end of the ground wire 3 is electrically connected to the socket 4 provided on the outside of the housing 1. In this embodiment, the protrusion 102 is a protruding structure provided on the wall of the outlet hole 101. When the mounting part is the protrusion 102, the connection between the ground wire 3 and the mounting part is simpler. Moreover, the live wire 2 in the outlet hole 101 is protected by the surrounding section 302, and the live wire 2 will not be affected by the protrusion 102. In some application scenarios, the mounting part provided on the wall of the outlet hole 101 can also be a hole structure, and the end of the ground wire 3 can be inserted into the hole structure and fixed. This embodiment does not limit the specific structure of the socket 4, and can realize the electrical connection of the motor to the outside. For example, the socket 4 can be provided with a power connector corresponding to the live wire 2 and a ground connector corresponding to the ground wire 3. In this embodiment, the socket 4 can be fixed to the outer surface of the housing 1 with screws. The position of the socket 4 corresponds to the position of the cable outlet 101. After assembly, the socket 4 can cover the cable outlet 101.

[0039] In one embodiment, such as Figures 3-5 As shown, the protrusion 102 has a mounting hole 103, and one end of the ground wire 3 has a connector 301. The connector 301 has a through hole 303. The connector 301 is screwed through the through hole 303 and engages with the mounting hole 103 to form a connection and fixation between the ground wire 3 and the protrusion 102. The connection and fixation between the protrusion 102 and the connector 301 by screws facilitates subsequent disassembly and maintenance. The connection formed by the screw passing through the through hole 303 on the connector 301 is more stable, which helps to improve the reliability of the connection and fixation between the ground wire 3 and the protrusion 102. In some embodiments, one end of the ground wire 3 may not have a connector 301, and the end of the ground wire 3 can be directly fixed to the stud of the screw. In some embodiments, one end of the ground wire 3 can be connected and fixed to the protrusion 102 by welding. In this case, a welding connector 301 can be provided on the ground wire 3, or the connector 301 may not be provided, and the end of the ground wire 3 can be directly welded to the protrusion 102. In this embodiment, the mounting hole 103 can be a threaded hole. After the screw passes through the through hole, it engages with the threaded hole 103 to fix the connector 301 on the protrusion 102. However, it is not limited to this. For example, the mounting hole 103 can also be a through hole.

[0040] In one embodiment, the connector 301 is plate-shaped, the protrusion 102 has a plane 104, and the axis of the mounting hole 103 is perpendicular to the plane 104. A screw passes through the through hole 303 on the plate-shaped connector 301 and engages with the mounting hole 103 to connect and fix the connector 301 to the protrusion 102. In this embodiment, perpendicular and approximately perpendicular are equivalent substitutions. The better fit between the plate-shaped connector 301 and the plane 104 is beneficial to improving the reliability of the electrical connection between the connector 301 and the protrusion 102.

[0041] In one embodiment, plane 104 is perpendicular to the axial extension direction of outlet hole 101, and a gap is left between plane 104 and the outer opening of outlet hole 101 to accommodate connector 301. Plane 104 is perpendicular to the hole wall of outlet hole 101, that is, the axial extension direction of mounting hole 103 is parallel to the extension direction of outlet hole 101, which facilitates the connection and assembly between connector 301 and protrusion 102. A gap is left between plane 104 and the opening of outlet hole 101 near the outer side of housing 1, that is, plane 104 and the outer surface of housing 1 are stepped, and the gap provides a certain clearance space, which is beneficial for the subsequent assembly of socket 4 and avoids interference between socket 4 and connector 301. This embodiment does not limit the size of this gap and can be set as needed. In some embodiments, when there is no interference, or when clearance space can be provided on socket 4, plane 104 can also be flush with the opening of outlet hole 101 near the outer side of housing 1. In some embodiments, a metal spring washer is provided between the connector 301 and the plane 104. The metal spring washer has a notch, and the portions on both sides of the notch have a height difference in their natural state, which is used to generate elastic deformation to reduce the height difference when the screw is screwed in. It can be understood that the natural state of the metal spring washer is the shape of the metal spring washer when it is not compressed by external force. The portions on both sides of the notch in the metal spring washer are the two ends of the metal spring washer. The two ends have a height difference in the axial direction of the metal spring washer. When the screw is screwed in, the distance between the connector 301 and the protrusion 102 gradually decreases, compressing the metal spring washer. The elastic deformation of the metal spring washer reduces the height difference between the two ends. The metal spring washer is conductive and has a tendency to recover its deformation, so it can always remain tightly fitted between the connector 301 and the plane 104, thereby further improving the reliability of the electrical connection between the connector 301 and the protrusion 102.

[0042] In the motor provided in the above embodiment, the ground wire 3 has a surrounding section 302, at least a portion of which is located in the outlet hole 101. The surrounding section 302 is wound around the live wire 2, isolating the live wire 2 from the hole wall of the outlet hole 101. The surrounding section 302 isolates the live wire 2 from the hole wall of the outlet hole 101, which helps prevent the live wire 2 from rubbing against the hole wall, thus protecting the live wire 2 and preventing motor voltage failure, thereby improving motor reliability. Furthermore, the ground wire 3 is directly connected and fixed to the mounting portion on the hole wall, which helps reduce the length of the ground wire 3 and simplify its arrangement.

[0043] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.

Claims

1. An electric machine, characterized in that The utility model relates to a three-phase AC motor, comprising a shell, a stator winding, a live wire, a ground wire, and a mounting portion. The shell is provided with an outlet hole, and the stator winding is arranged in the shell. The live wire is in electrical communication with the outlet end of the stator winding and passes out of the shell from the outlet hole. One end of the ground wire is fixedly connected to the shell and is in electrical communication with the shell.

2. The electric machine of claim 1, wherein, The ground wire has a surrounding segment, at least a part of which is located in the outlet hole and surrounds the live wire to isolate the live wire from the hole wall of the outlet hole.

3. The electric machine of claim 1, wherein, The three-phase AC motor includes three live wires, and the surrounding segment surrounds the three live wires together.

4. The electric machine of claim 1, wherein, The surrounding segment surrounds the live wire at least once.

5. The electric machine of any one of claims 1-4, wherein, The surrounding height of the surrounding segment is greater than or equal to the height of the outlet hole.

6. The electric machine of claim 5, wherein, The hole wall of the outlet hole is provided with a mounting portion, one end of the ground wire is connected and fixed to the mounting portion to form electrical communication between the ground wire and the shell.

7. The electric machine of claim 6, wherein, The mounting portion is a protrusion provided on the hole wall of the outlet hole, one end of the ground wire is connected and fixed to the protrusion, and the other end of the ground wire is in electrical communication with a socket provided outside the shell. The protrusion is provided with a mounting hole, one end of the ground wire is provided with a connector, the connector is provided with a through hole, the connector is connected and fixed to the mounting hole through a screw passing through the through hole, and the ground wire and the protrusion are connected and fixed.

8. The electric machine of claim 7, wherein, Alternatively, one end of the ground wire is connected and fixed to the protrusion by welding.

9. The electric machine of claim 8, wherein, The connector is in the shape of a sheet, the protrusion has a flat surface, the axis of the mounting hole is perpendicular to the flat surface, and the screw passes through the through hole in the sheet-shaped connector and cooperates with the mounting hole to connect and fix the connector to the protrusion.

10. The electric machine of claim 8, wherein, The flat surface extends perpendicular to the extension direction of the axis of the outlet hole, and a space for accommodating the connector is left between the flat surface and the outer opening of the outlet hole. A metal spring pad is arranged between the connector and the flat surface, the metal spring pad has a notch, and the portions on both sides of the notch in the metal spring pad have a height difference in a natural state to produce elastic deformation to reduce the height difference when the screw is screwed in.

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