Encoder installation structure and motor

Abstract

The present invention relates to an encoder, and discloses an encoder installation structure, comprising an encoder stator (1), an encoder rotor (2) and an encoder installation plate (3), wherein the encoder rotor (2) is installed on a motor core shaft through an installation through hole on the encoder installation plate (3), and the encoder rotor (2) is located in a cavity surrounded by the encoder stator (1) and the encoder installation plate (3), and the installation end of the encoder stator (1) is connected to the encoder installation plate (3) through a limiting structure, so that the encoder stator (1) can be fixed on the encoder installation plate (3) by clamping and sealing. The present invention also discloses a motor. The present invention is conducive to miniaturization of the motor, and can also ensure the sealing of the motor, thereby achieving a higher IP protection level.

Description

Technical Field

[0001] The present invention relates to an encoder, in particular to an encoder installation structure, and further to a motor. Background Art

[0002] With the continuous development of technology, the requirements for the length of motors in fields such as industrial automation and robotics are becoming increasingly stringent. Under the premise of equal power, the overall size of the motor is required to continue to shrink, and the miniaturization of motors has become a trend.

[0003] As an important component of the motor, the size and installation method of the encoder directly affect the IP protection level and body length of the motor.

[0004] There are two main ways to assemble the existing encoder. The first way is to fix it to the encoder mounting plate 2a with radial locking screws, such as Figure 1 and Figure 2 , after the encoder stator 1a is inserted into the raised part of the encoder mounting plate 2a, the encoder is fixed by screwing from the side; the second assembly method is to fix the encoder mounting plate 2a by screwing from the axial direction, such as Figure 3 and Figure 4 After the encoder stator 1a is inserted into the positioning hole of the encoder mounting plate 2a, the encoder stator 1a is fixed to the encoder mounting plate 2a with screws using a pressure block.

[0005] The first radial assembly method is not conducive to reducing the axial size of the encoder, making the motor body too long; the second axial assembly method is prone to poor motor sealing, resulting in the motor's IP protection level being too low. For example, the 40-frame series motors currently on the market use this method to assemble encoders. Due to the large size of the encoder, it is easy to cause poor sealing of the motor, resulting in the motor's IP protection level being too low and unable to reach the IP65 and above protection levels of other power ranges on the market.

[0006] Therefore, in view of the above-mentioned defects of the prior art, it is necessary to design a new encoder installation structure. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide an encoder installation structure, which can not only shorten the axial size of the encoder and relatively reduce the axial size of the motor; but also ensure the sealing of the motor and achieve a higher IP protection level.

[0008] Furthermore, the technical problem to be solved by the present invention is to provide a motor having a relatively small axial dimension, which is conducive to miniaturization, and also having a relatively high IP protection grade.

[0009] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides an encoder mounting structure, including an encoder stator, an encoder rotor and an encoder mounting plate, the encoder rotor is installed on the motor core shaft through the mounting through hole on the encoder mounting plate, and the encoder rotor is located in the cavity enclosed by the encoder stator and the encoder mounting plate, the mounting end of the encoder stator and the annular groove are connected by a limiting structure, so that the encoder stator can be snap-fitted and sealed to the encoder mounting plate.

[0010] Preferably, the limiting structure includes an annular groove formed on the encoder mounting plate and surrounding the mounting through hole, and a mounting end of the encoder stator capable of being inserted into the annular groove, and a first sealing groove for fixing a first sealing ring is formed along the circumferential direction on the outer peripheral surface of the mounting end.

[0011] Specifically, a first protruding structure is formed on the outer peripheral surface of the mounting end along the circumferential direction, and the first sealing groove is opened on the first protruding structure.

[0012] Preferably, the limiting structure includes an annular groove formed on the encoder mounting plate and surrounding the mounting through hole, and the mounting end can be inserted into the annular groove, and a first sealing groove for fixing a first sealing ring is formed circumferentially on the outer circumferential wall surface in the annular groove and on the outer circumferential surface of the mounting end, or a first sealing groove for fixing a first sealing ring is formed on the outer circumferential wall surface in the annular groove.

[0013] Furthermore, at least one limiting groove is formed on the encoder mounting plate, and a second protruding structure that cooperates with the limiting groove is formed on the mounting end.

[0014] Specifically, the limiting groove is located in the annular groove and is arranged around the mounting through hole.

[0015] Preferably, the limiting structure includes a protrusion formed on the encoder mounting plate and surrounding the mounting through hole and a mounting end of the encoder stator that can be mounted on the protrusion, and a first sealing groove for fixing a first sealing ring is formed along the circumferential direction on the outer peripheral surface of the protrusion.

[0016] A second aspect of the present invention provides a motor, comprising an encoder mounting structure and a motor back cover as described in any one of the technical solutions of the first aspect, wherein the motor back cover is connected to the encoder mounting plate via an encoder stator.

[0017] Preferably, a second sealing groove for fixing a second sealing ring is formed on the outer peripheral surface of the encoder stator along the circumferential direction, so that the encoder stator can be sealed and connected to the motor rear cover.

[0018] Specifically, it also includes a wire outlet nozzle connected to the opening on the motor back cover and a pressure cover mounted on the wire outlet nozzle, and the pressure cover is installed on the motor back cover to enable the encoder signal line to extend out of the motor back cover through the wire outlet nozzle and the pressure cover.

[0019] Through the above technical scheme, the present invention sets a limiting structure so that the encoder stator is fixed to the encoder mounting plate in a snap-fit ​​and sealed manner. Compared with the first radial assembly method in the prior art, it is not necessary to reserve screw installation space along the axial direction, which can reduce the axial size of the encoder and thus reduce the body length of the motor; compared with the second axial assembly method in the prior art, it is not necessary to set a groove structure for matching the pressure block on the encoder stator, which can effectively reduce the radial size of the encoder, thereby reducing the volume of the encoder, making the motor well sealed, and to a certain extent making the motor have a relatively high IP protection level; it is also conducive to the miniaturization of the motor as a whole.

[0020] Specifically, the mounting end of the encoder stator can be inserted into the annular groove on the encoder mounting plate, and a first sealing groove is circumferentially arranged on the inner wall of the annular groove and / or the outer peripheral surface of the mounting end. The first sealing groove can fix the first sealing ring. Through the cooperation between the first sealing ring and the first sealing groove, on the one hand, the encoder stator and the encoder mounting plate can be clamped and fixed to relatively reduce the body length of the motor. On the other hand, the encoder stator and the encoder mounting plate can be sealed to ensure good sealing of the motor.

[0021] Other advantages of the present invention and the technical effects of the preferred embodiments will be further described in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the first radial assembly method of the encoder in the prior art;

[0023] Figure 2 It is a three-dimensional assembly diagram of the first radial assembly method of the encoder in the prior art;

[0024] Figure 3 It is a cross-sectional view of the second axial assembly method of the encoder in the prior art;

[0025] Figure 4 It is a three-dimensional assembly diagram of the second axial assembly method of the encoder in the prior art;

[0026] Figure 5 is a cross-sectional view of an encoder installation structure in a specific embodiment of the present invention;

[0027] Figure 6 The structure of the encoder mounting plate in a specific embodiment of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 7 yes Figure 6 Sectional view along line AA;

[0029] Figure 8 The structure of the encoder mounting plate in a specific embodiment of the present invention is shown in FIG. Figure 2 ;

[0030] Fig. 9 is a schematic structural diagram of an encoder stator in a specific embodiment of the present invention;

[0031] Fig.10 It is a structural schematic diagram of the connection between the motor rear cover and the gland cover in a specific embodiment of the present invention;

[0032] Fig.11 It is a three-dimensional assembly diagram of an encoder assembly method in a specific implementation mode of the present invention.

[0033] Description of Reference Numerals

[0034] 1 Encoder stator 11 First protrusion structure

[0035] 12 second raised structure 2 encoder rotor

[0036] 3Encoder mounting plate 31 annular groove

[0037] 32 limit groove 4 first sealing ring

[0038] 5First sealing groove 6Motor rear cover

[0039] 61 opening 7 second sealing ring

[0040] 8 Second sealing groove 9 Wire outlet nozzle

[0041] 10 gland 20 encoder signal line DETAILED DESCRIPTION

[0042] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] First of all, it should be noted that in the description of the following technical solution of the present invention, the technical definition is based on the encoder itself as the orientation reference, such as the side where the mounting end of the encoder stator is connected to the encoder mounting plate is the left, and the side opposite to it is the right. However, the "left" and "right" do not refer to the left and right orientations that the encoder must have when installed on the motor. In actual installation situations, due to the different installation positions of the motor, there are multiple possible installation orientations for the encoder. The limitation of the left and right orientations of the encoder itself does not constitute a limitation on the protection scope of the encoder installation structure of the present invention. The orientation technical meaning of the encoder applied to the motor of the present invention should be interpreted according to the actual installation state and in combination with the left and right technical meanings based on the encoder itself as the reference.

[0046] Figure 1 and Figure 2 A radial assembly method of an encoder is shown, in which the encoder stator 1a is fixed to the encoder mounting plate 2a by screws from the radial direction, and the encoder stator 1a needs to reserve enough installation space for the screws in the axial direction, which is not conducive to reducing the axial size of the encoder, limits the reduction of the axial size of the motor, and causes the motor body to be too long; Figure 3 and Figure 4 The invention shows an axial assembly method of an encoder, which uses a pressing block and screws to axially lock and fix the encoder stator 1a on the encoder mounting plate 2a. Due to the limitation of the external dimensions of the encoder itself, the encoder stator needs to have a large enough area to lock the screws, which makes the encoder volume too large. For example, the 40-frame series motors currently on the market use this method to assemble the encoder. Due to the large size of the encoder, it is easy to cause the seal of the motor to be in poor condition, resulting in the motor's IP protection level being too low, and unable to reach the IP65 and above protection levels of other power segments on the market. The 40-frame series motor refers to an asynchronous motor with a motor frame number of 40. The IP protection level refers to the classification of electrical appliances according to their dust and moisture resistance characteristics. The IP protection level is composed of two numbers. The first number indicates the level of dust and foreign object intrusion prevention of the electrical appliance (the foreign objects referred to here include tools, human fingers, etc., which cannot touch the live parts of the electrical appliance to avoid electric shock). The second number indicates the degree of airtightness of the electrical appliance against moisture and water intrusion. The larger the number, the higher the protection level.

[0047] The present invention fixes the encoder stator 1 on the encoder mounting plate 3 by snap-fitting and sealing. On the one hand, no screw installation space needs to be reserved along the axial direction, which can reduce the axial size of the encoder; on the other hand, no groove structure for matching screws and pressure blocks needs to be reserved, which can effectively reduce the radial size of the encoder, so that the motor can have a relatively high IP protection level; as a whole, it is conducive to miniaturization of the motor. The technical solution of the present invention is described in detail below in conjunction with specific implementation methods.

[0048] like Figures 5 to 9 As shown, the encoder mounting structure of the basic embodiment of the present invention includes an encoder stator 1, an encoder rotor 2 and an encoder mounting plate 3. The encoder rotor 2 is mounted on the motor core shaft through the mounting through hole on the encoder mounting plate 3, and the encoder rotor 2 is located in a cavity surrounded by the encoder stator 1 and the encoder mounting plate 3. The mounting end of the encoder stator 1 is connected to the encoder mounting plate 3 through a limiting structure so that the encoder stator 1 can be snap-fitted and sealed to the encoder mounting plate 3.

[0049] On the basis of the basic technical scheme of the present invention, which is adapted to general motors, the encoder stator 1 is clamped and sealed and fixed on the encoder mounting plate 3 through a limiting structure, which not only facilitates the miniaturization of the motor and enables the motor to have a relatively high IP protection grade, but also reduces the assembly process of screws and pressure blocks, simplifies the process to a certain extent, saves materials and reduces costs.

[0050] In order to facilitate understanding of the encoder installation structure of the technical solution of the present invention, the encoder installation structure is further described in relative detail below.

[0051] As a specific implementation method, refer to Figures 5 to 9 The limiting structure includes an annular groove 31 and a mounting end of the encoder stator 1. The annular groove 31 is opened on the encoder mounting plate 3 and is arranged around the mounting through hole of the encoder mounting plate 3. The mounting end can be inserted into the annular groove 31. A first sealing ring 4 is installed between the annular groove 31 and the mounting end. In order to fix the first sealing ring 4, a first sealing groove 5 can be circumferentially arranged on the outer peripheral surface of the mounting end; the first sealing groove 5 can not only clamp the first sealing ring 4, but also the first sealing groove 5 and the first sealing ring 4 can jointly ensure that the encoder stator 1 will not be separated from the encoder mounting plate 3 without the action of external force. The first sealing ring 4 can also ensure the sealing between the encoder stator 1 and the encoder mounting plate 3 to reach the required IP protection level.

[0052] Preferably, refer to Figure 5 and Fig. 9As shown, a first protruding structure 11 may be provided on the outer circumferential surface of the mounting end along the circumferential direction, and the first sealing groove 5 is arranged on the first protruding structure 11 .

[0053] As another specific implementation, refer to Figures 5 to 9 The limiting structure includes an annular groove 31 and a mounting end of the encoder stator 1. The annular groove 31 is opened on the encoder mounting plate 3 and is arranged around the mounting through hole of the encoder mounting plate 3. The mounting end can be inserted into the annular groove 31. A first sealing ring 4 is installed between the annular groove 31 and the mounting end. In order to fix the first sealing ring 4, a first sealing groove 5 can be circumferentially arranged on the outer peripheral wall surface in the annular groove 31 and on the outer peripheral surface of the mounting end, or a first sealing groove 5 can be arranged on the outer peripheral wall surface in the annular groove 31, wherein "the outer peripheral wall surface in the annular groove 31" refers to the side wall surface located on the outside of the two side walls constituting the annular groove 31.

[0054] In addition, refer to Figure 8 and Fig. 9 As shown, in order to prevent the encoder stator 1 from being driven to rotate around the central axis, a limiting groove 32 can be opened on the surface of the encoder mounting plate 3 connected to the encoder stator 1. One or more limiting grooves 32 can be provided as needed. Accordingly, the mounting end of the encoder stator 1 can form a second protruding structure 12. In the installed state, the second protruding structure 12 can be restricted in the limiting groove 32 to play a limiting role; preferably, the limiting groove 32 is located in the annular groove 31 and is arranged around the mounting through hole; it should be noted that Figure 8 and Fig. 9 Only one matching mode between the limiting groove 32 and the second protruding structure 12 is shown, wherein the mounting end extends axially to form the second protruding structure 12, and a simple modification can also be performed to form other matching modes with equivalent functions, for example, the mounting end extends radially to form the second protruding structure 12, which can also cooperate with the limiting groove 32 to play a limiting role, and at the same time, will not affect the miniaturization of the motor and the enhancement of the IP protection level; or, the limiting groove 32 can also be arranged outside the annular groove 31, and cooperate with the second protruding structure 12 arranged on the outer peripheral surface of the mounting end; Fig. 9 The second protrusion structure 12 is a plate-shaped structure. The second protrusion structure 12 may also be a columnar structure, a spherical protrusion or other shapes. The shape of the limiting groove 32 can be set accordingly.

[0055] As another specific implementation, it can be compared to Figure 1 and Figure 2As shown, the limiting structure includes a protrusion and a mounting end that can be sleeved on the protrusion. The protrusion is arranged on the encoder mounting plate 3 and surrounds the mounting through hole. A first sealing groove 5 is circumferentially arranged on the outer peripheral surface of the protrusion. The first sealing groove 5 can fix the first sealing ring 4, which is equivalent to the technical solution of the above-mentioned annular groove 31 and the mounting end of the encoder stator 1 being clamped. The first sealing groove 5 can not only clamp the first sealing ring 4, but also, under the joint action of the first sealing groove 5 and the first sealing ring 4, it can ensure that the encoder stator 1 will not be detached from the encoder mounting plate 3 in the absence of external force. Since there is no need to set a groove structure on the encoder stator 1, the overall volume of the encoder can be reduced to a certain extent, which is beneficial to the miniaturization of the motor; similarly, the first sealing ring 4 can also ensure the sealing between the encoder stator 1 and the encoder mounting plate 3, so that the motor reaches the required IP protection level.

[0056] Reference Figures 5 to 9 As shown, the encoder installation structure of the preferred embodiment of the present invention, the encoder stator 1, the encoder rotor 2 and the encoder installation plate 3, refer to Figure 5 and Fig.11 As shown, the encoder rotor 2 is mounted on the motor core shaft by screws, the motor core shaft passes through the mounting through hole on the encoder mounting plate 3, and the encoder rotor 2 is located in the cavity surrounded by the encoder stator 1 and the encoder mounting plate 3, an annular groove 31 is provided on the encoder mounting plate 3, the annular groove 31 is arranged around the mounting through hole, the mounting end of the encoder stator 1 can be inserted into the annular groove 31, and a first sealing groove 5 is circumferentially provided on the outer peripheral wall surface in the annular groove 31 and / or the outer peripheral surface of the mounting end, the first sealing groove 5 can clamp the first sealing ring 4, and under the joint action of the first sealing groove 5 and the first sealing ring 4, the encoder stator 1 can be installed without It will not detach from the encoder mounting plate 3 under the condition of external force, and the length of the encoder is shortened compared with the prior art; and the first sealing ring 4 can seal the encoder stator 1 and the encoder mounting plate 3; a limiting groove 32 is provided on the surface of the encoder mounting plate 3 connected to the encoder stator 1, and the limiting groove 32 is located in the annular groove 31 and is arranged around the mounting through hole. Accordingly, the mounting end of the encoder stator 1 extends axially to form a second protruding structure 12. In the installed state, the second protruding structure 12 can be confined in the limiting groove 32 to play a limiting role, thereby preventing the encoder stator 1 from being driven to rotate around the central axis.

[0057] On the basis of the various technical solutions of the present invention described above, the encoder mounting structure of the present invention can be adapted to the motor back cover of a general motor. Specifically, referring to Figure 5 , Fig.10 and Fig.11, connect the motor rear cover 6 to the encoder mounting plate 3 by screws, and ensure that the motor rear cover 6 can press the encoder stator 1; in this way, it is further ensured that the encoder stator 1 can be fixed without additional screws and matching structures, which simplifies the assembly process, saves materials, and reduces costs;

[0058] Further, refer to Fig. 9 As shown, a second sealing groove 8 can be provided on the outer peripheral surface of the encoder stator 1 along the circumferential direction, and the second sealing groove 8 can be used to fix the second sealing ring 7 to ensure the sealing between the encoder and the motor rear cover 6.

[0059] In order to ensure the sealing of the encoder signal line 20 extending from the motor back cover 6, the opening 61 on the motor back cover 6 can be connected to the line outlet nozzle 9, and the line outlet nozzle 9 can be covered with a pressure cover 10 to fix the line outlet nozzle 9. The pressure cover 10 is installed on the motor back cover 6 by screws. The encoder signal line 20 extends out of the motor back cover 6 through the line outlet nozzle 9 and the pressure cover 10, thereby ensuring the sealing. The pressure cover 10 can be made of plastic material or other similar materials.

[0060] Specifically, refer to Fig.10 The gland 10 extends to both ends to form a pair of mounting ears, through which screws can pass to fix the gland 10 on the motor rear cover 6; further, an opening is formed on the outer peripheral surface of the left end of the encoder stator 1, which can be used to pass the encoder signal line 20.

[0061] It can be seen from the above technical solution that since the mounting end of the encoder stator 1 can be inserted into the annular groove 31 and the first sealing groove 5 arranged along the circumferential direction on the outer peripheral wall surface in the annular groove 31 and / or the outer peripheral surface of the mounting end can fix the first sealing ring 4, the motor back cover 6 is connected to the encoder mounting plate 3 by screws and the encoder stator 1 is pressed, so that the structure is more compact, the length of the encoder is shortened, and the overall length of the motor is reduced; for the assembly of the encoder, it has the advantages of fewer processes, less materials, and low cost; and a second sealing groove 8 is provided on the outer peripheral surface of the encoder stator 1 along the circumferential direction, and the second sealing groove 8 is used to fix the second sealing ring 7, which can ensure the sealing between the encoder and the motor back cover 6; The encoder signal line 20 extends out of the motor rear cover 6 through the outlet nozzle 9 and the pressure cover 10, further ensuring the sealing performance. The above design allows the motor to have good sealing performance. For example, when the encoder mounting structure of the present invention is applied to a 40 frame series motor, a higher IP protection level requirement can be achieved, such as reaching IP65 and above protection levels of other power ranges on the market. Although the functional effects of the encoder mounting structure of the present invention are described above using the 40 frame series motor as an example, it can be understood that the encoder mounting structure of the present invention can also be applied to other series of motors using the principle of the encoder mounting structure of the present invention, and the same functional effects can be achieved.

[0062] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any suitable manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. An encoder mounting structure, comprising an encoder stator (1), an encoder rotor (2) and an encoder mounting plate (3), wherein the encoder rotor (2) is mounted on a motor core shaft through a mounting through hole on the encoder mounting plate (3), and the encoder rotor (2) is located in a cavity enclosed by the encoder stator (1) and the encoder mounting plate (3), characterized in that: The mounting end of the encoder stator (1) is connected to the encoder mounting plate (3) via a limiting structure, so that the encoder stator (1) can be fixed on the encoder mounting plate (3) in a sealed manner by snapping; The limiting structure comprises an annular groove (31) formed on the encoder mounting plate (3) and surrounding the mounting through hole, and the mounting end capable of being inserted into the annular groove (31), and a first sealing groove (5) for fixing a first sealing ring (4) is formed on the outer peripheral surface of the mounting end along the circumferential direction.

2. The encoder installation structure according to claim 1, characterized in that: A first protruding structure (11) is formed on the outer peripheral surface of the mounting end along the circumferential direction, and the first sealing groove (5) is provided on the first protruding structure (11).

3. An encoder mounting structure, comprising an encoder stator (1), an encoder rotor (2) and an encoder mounting plate (3), wherein the encoder rotor (2) is mounted on a motor core shaft through a mounting through hole on the encoder mounting plate (3), and the encoder rotor (2) is located in a cavity enclosed by the encoder stator (1) and the encoder mounting plate (3), characterized in that: The mounting end of the encoder stator (1) is connected to the encoder mounting plate (3) via a limiting structure, so that the encoder stator (1) can be fixed on the encoder mounting plate (3) in a sealed manner by snapping; The limiting structure comprises an annular groove (31) formed on the encoder mounting plate (3) and surrounding the mounting through hole, and the mounting end capable of being inserted into the annular groove (31), a first sealing groove (5) for fixing the first sealing ring (4) is formed along the circumferential direction on the outer peripheral wall surface of the annular groove (31) and on the outer peripheral surface of the mounting end, or a first sealing groove (5) for fixing the first sealing ring (4) is formed on the outer peripheral wall surface of the annular groove (31).

4. The encoder installation structure according to any one of claims 1 to 3, characterized in that: At least one limiting groove (32) is formed on the encoder mounting plate (3), and a second protruding structure (12) that cooperates with the limiting groove (32) is formed on the mounting end.

5. The encoder installation structure according to claim 4, characterized in that: The limiting groove (32) is located in the annular groove (31) and is arranged around the mounting through hole.

6. An encoder mounting structure, comprising an encoder stator (1), an encoder rotor (2) and an encoder mounting plate (3), wherein the encoder rotor (2) is mounted on a motor core shaft through a mounting through hole on the encoder mounting plate (3), and the encoder rotor (2) is located in a cavity enclosed by the encoder stator (1) and the encoder mounting plate (3), characterized in that: The mounting end of the encoder stator (1) is connected to the encoder mounting plate (3) via a limiting structure, so that the encoder stator (1) can be fixed on the encoder mounting plate (3) in a sealed manner by snapping; The limiting structure comprises a protrusion formed on the encoder mounting plate (3) and surrounding the mounting through hole and the mounting end capable of being fitted onto the protrusion, and a first sealing groove (5) for fixing a first sealing ring (4) is formed along the circumferential direction on the outer peripheral surface of the protrusion.

7. A motor, characterized in that: It comprises an encoder mounting structure and a motor rear cover (6) according to any one of claims 1 to 6, wherein the motor rear cover (6) is connected to the encoder mounting plate (3) via the encoder stator (1).

8. The motor according to claim 7, characterized in that A second sealing groove (8) for fixing a second sealing ring (7) is formed on the outer peripheral surface of the encoder stator (1) along the circumferential direction, so that the encoder stator (1) can be sealed and connected to the motor rear cover (6).

9. The motor according to claim 7 or 8, characterized in that: It also includes a wire outlet nozzle (9) connected to the opening (61) on the motor rear cover (6) and a pressure cover (10) mounted on the wire outlet nozzle (9), wherein the pressure cover (10) is mounted on the motor rear cover (6) so that the encoder signal line (20) can extend out of the motor rear cover (6) through the wire outlet nozzle (9) and the pressure cover (10).

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