Sealed induction assembly and motor

Abstract

The utility model discloses a sealing induction assembly and a motor, and relates to the technical field of driving equipment, the motor comprises a casing, a stator assembly, a rotor assembly and a sealing induction assembly, the casing is provided with a mounting cavity; the stator assembly is arranged in the mounting cavity; the rotor assembly is arranged in the stator assembly or arranged outside the stator assembly in a sleeving manner, and the rotor assembly comprises a rotating shaft; the rotating shaft is sleeved with the sealing induction assembly, the sealing induction assembly comprises a sealing piece and an induction piece, the sealing piece is used for sealing a gap between the rotating shaft and the mounting cavity, the induction piece is arranged on one side of the sealing piece, and the induction piece is used for being matched with an external sensor to detect the rotating position of the rotating shaft; according to the technical scheme provided by the utility model, the occupied space when the sealing element and the sensing element are independently used originally can be reduced, and the installation can be simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to drive equipment technical field especially relates to a sealed induction assembly and motor. BACKGROUND

[0002] At present, in order to improve the control precision, speed monitoring ability, direction detection and synchronous control ability and fault diagnosis and monitoring ability of motor, a magnetic encoder is installed on the rotating shaft of motor, and a sealing member is also provided to prevent lubricating oil on the rotating shaft of motor from overflowing, but the sealing member and the magnetic encoder on the rotating shaft are two independent components, which occupy a large space and are inconvenient to install. SUMMARY

[0003] The utility model discloses a sealed induction assembly and motor, which aims to solve the problem of large space occupation and inconvenient installation caused by independent design of the existing sealing member and magnetic encoder.

[0004] To achieve the above-mentioned purpose, the utility model provides a sealed induction assembly, which is applied to a motor, and the motor comprises:

[0005] A housing has a mounting cavity.

[0006] A stator assembly is arranged in the mounting cavity.

[0007] A rotor assembly is arranged in or outside the stator assembly, and the rotor assembly comprises a rotating shaft. The sealed induction assembly comprises a sealing member and a sensing member. The sealing member is used to seal the gap between the rotating shaft and the mounting cavity. The sensing member is arranged on one side of the sealing member. The sensing member is used to cooperate with an external sensor to detect the rotating position of the rotating shaft.

[0008] In an embodiment, the sealing member comprises a first skeleton and a sealing sleeve. The sealing sleeve is arranged outside the first skeleton to seal the gap between the rotating shaft and the mounting cavity.

[0009] The sensing member comprises a second skeleton and a magnetic rubber. The magnetic rubber is arranged on the side of the second skeleton away from the sealing member. The sealing sleeve, the first skeleton and the second skeleton are integrally arranged.

[0010] In an embodiment, the first skeleton comprises a ring part and a flange. The ring part is arranged outside the rotating shaft.

[0011] The sealing sleeve comprises a first wrapping part, a second wrapping part and a connecting part. The first wrapping part is arranged at one end of the ring part away from the flange. The second wrapping part is arranged at one end of the flange away from the ring part. The connecting part is used to connect the first wrapping part and the second wrapping part and is arranged on one side of the flange.

[0012] In an embodiment, the first wrapping part is provided with a mounting and adhering surface towards the surface of the rotating shaft, and the mounting and adhering surface is wavy in cross section along the extending direction of the rotating shaft.

[0013] In an embodiment, the second wrapping part is provided with a sealing lip and a dustproof lip protruding towards the cavity wall of the mounting cavity, and the sealing lip and the dustproof lip are arranged at an angle.

[0014] In an embodiment, the inner diameter of the first wrapping part is D3, and the diameter of the rotating shaft is D4, and D3 < D4.

[0015] In an embodiment, the sealing sleeve and the magnetic rubber are integrally formed with the second framework by common vulcanization.

[0016] In an embodiment, the magnetic rubber is provided with a plurality of N poles and a plurality of S poles away from the surface of the second framework, and the plurality of N poles and the plurality of S poles are staggered along the circumference of the magnetic rubber.

[0017] In an embodiment, the inner diameter of the second framework is D5, and the diameter of the rotating shaft is D4, and D5 < D4.

[0018] The utility model also proposes a motor, include:

[0019] The shell has a mounting cavity.

[0020] The stator assembly is arranged in the mounting cavity.

[0021] The rotor assembly is arranged in the stator assembly or is sleeved outside the stator assembly, and the rotor assembly comprises a rotating shaft.

[0022] The sealing and sensing assembly described in the above embodiment is sleeved on the rotating shaft.

[0023] In an embodiment, the motor further comprises an anti-wear sleeve, and the anti-wear sleeve is arranged in the mounting cavity, and the outer wall of the anti-wear sleeve is in interference fit with the inner wall of the mounting cavity.

[0024] In an embodiment, the outer wall diameter of the anti-wear sleeve is D1, the inner diameter of the mounting cavity is D2, and D1 > D2.

[0025] In an embodiment, the anti-wear sleeve is a steel sleeve.

[0026] The technical scheme of the utility model integrates the sealing member and the sensing member originally having different functions and is simultaneously installed on the rotating shaft for use, which not only reduces the space originally occupied by the sealing member and the sensing member when used separately but also simplifies the installation. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0028] Figure 1 The structure diagram of the motor provided by the present application is shown.

[0029] Explanation of reference numerals:

[0030] 100, motor; 10, machine shell; 20, rotating shaft; 30, anti-wear sleeve; 40, sealing induction assembly; 411, first skeleton; 4111, ring part; 4112, flange; 41, sealing element; 412, sealing sleeve; 4121, first wrapping part; 4121a, mounting and adhering surface; 4122, second wrapping part; 4122a, sealing lip; 4122b, dustproof lip; 4123, connecting part; 42, induction element; 421, second skeleton; 422, magnetic rubber; 50, sensor.

[0031] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0033] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0034] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0035] At present, in order to improve the control precision, speed monitoring ability, direction detection and synchronous control ability, fault diagnosis and monitoring ability of the motor, a magnetic encoder is installed on the rotating shaft of the motor, and a sealing member is also provided to prevent the lubricating oil on the rotating shaft of the motor from overflowing, but the sealing member and the magnetic encoder on the rotating shaft are two independent components, which occupies a large space and is inconvenient to install.

[0036] The utility model provides a kind of motor 100.

[0037] Please refer to Figure 1 In an embodiment of the utility model, the motor 100 includes a housing 10, a stator assembly, a rotor assembly and a sealing sensing assembly 40. The housing 10 has a mounting cavity. The stator assembly is arranged in the mounting cavity. The rotor assembly is arranged in the stator assembly or is sleeved outside the stator assembly. The rotor assembly includes a rotating shaft 20. The sealing sensing assembly 40 is sleeved on the rotating shaft 20. The sealing sensing assembly 40 includes a sealing member 41 and a sensing member 42. The sealing member 41 is used to seal the gap between the rotating shaft 20 and the mounting cavity. The sensing member 42 is arranged on one side of the sealing member 41. The sensing member 42 is used to cooperate with an external sensor 50 to detect the rotating position of the rotating shaft 20.

[0038] The technical scheme of the utility model discloses a mounting cavity is set up in the inside of the casing 10, the mounting cavity mainly contains the stator assembly, the rotor assembly and the sealed sensing assembly 40 installation, in this embodiment, motor 100 can be outer rotor motor 100, also can be inner rotor motor 100, for example, the stator assembly can be installed into the mounting cavity of casing 10 first, then the rotor assembly is inserted and arranged in the stator assembly, and the stator assembly is interval arrangement, for example, the stator assembly is installed into the mounting cavity of casing 10, then the rotor assembly is set in the periphery of stator assembly, that is, the rotor assembly is arranged between the stator assembly and the cavity wall of mounting cavity, and this is not limited too much.In this embodiment, the rotor assembly includes the rotor core and rotor winding for magnetic induction with the stator assembly, and the output power shaft 20, to prevent the lubricating oil coated on the output power shaft 20 from overflowing through the gap between the casing 10 and the output power shaft 20, and at the same time, the problem of the encoder installation can be solved.In this embodiment, the sealed sensing assembly 40 is also provided, and the sealed sensing assembly 40 includes a sealing element 41 and a sensing element 42, wherein the sealing element 41 and the sensing element 42 are integrally arranged, and the sealed sensing assembly 40 is sleeved on the outer periphery of the output power shaft 20, wherein the sealing element 41 in the sealed sensing assembly 40 can effectively seal the gap between the output power shaft 20 and the casing 10, to prevent the lubricating oil from overflowing through the mounting gap between the output power shaft 20 and the casing 10, and the sensing element 42 is arranged on one side of the sealing element 41, the sensing element 42 is arranged on the side of the sealing element 41 facing the external environment, and the sensing element 42 is mainly used for cooperating with the external sensor 50 to detect the rotating position of the output power shaft 20, since the sealed sensing assembly 40 is sleeved on the output power shaft 20, the sealed sensing assembly 40 rotates synchronously with the output power shaft 20, and when the sensing element 42 rotates synchronously with the output power shaft 20, the magnetic field induction between the sensing element 42 and the sensor 50 changes, so that the current rotating position information of the output power shaft 20 is obtained.In this embodiment, the sealing element 41 and the sensing element 42 having different functions are integrally arranged and synchronously installed on the output power shaft 20, so that the space occupied by the sealing element 41 and the sensing element 42 used alone can be reduced and the installation can be simplified.

[0039] As to the specific position of the sealing member 41 arranged in the sealing induction assembly 40, the sealing member 41 can be arranged in the mounting cavity of the casing 10 or arranged at the cavity opening of the mounting cavity of the casing 10 where the rotating shaft 20 extends out of the casing 10, and no more limitation is made. Secondly, as to the integrated design of the sealing member 41 and the induction member 42, the two can be pre-assembled by splicing structure, or connected into one by screwing structure, or integrally formed by common vulcanization process, and no more limitation is made. Thirdly, as to the selection of the induction member 42 and the sensor 50, the induction member 42 can be a magnetic structure, and the sensor 50 can be a Hall sensor 50, thereby forming a magnetic sensor 50, of course, the induction member 42 and the sensor 50 can also be a photoelectric sensor 50, or a magneto-resistance sensor 50, and no more limitation is made.

[0040] In an embodiment, the motor 100 further comprises an anti-wear sleeve 30 arranged in the mounting cavity, and the outer wall of the anti-wear sleeve 30 is in interference fit with the inner wall of the mounting cavity. In this embodiment, since the sealing member 41 is movable relative to the cavity wall of the mounting cavity of the casing 10, that is, the sealing member 41 will cause wear to the inner wall of the casing 10 while rotating with the rotating shaft 20, in order to prevent the sealing member 41 from directly causing wear to the inner wall of the casing 10. In this embodiment, the anti-wear sleeve 30 is arranged between the sealing member 41 and the inner wall of the mounting cavity of the casing 10, and the anti-wear sleeve 30 is arranged in the mounting cavity of the casing 10 in interference fit, of course, the anti-wear sleeve 30 can also be arranged in the mounting cavity by gluing, and no more limitation is made. By such arrangement, the sealing member 41 for sealing will not directly cause wear to the casing 10 while rotating synchronously with the rotating shaft 20, but cause wear to the anti-wear sleeve 30. In this embodiment, the anti-wear sleeve 30 is used as a wear member, and can be replaced when worn seriously, and by such arrangement, the casing 10 can be effectively protected to prevent the sealing member 41 from causing wear to the casing 10, so that the casing 10 needs not to be replaced, thereby reducing the maintenance cost.

[0041] In an embodiment, the outer wall diameter of the wear sleeve 30 is D1, the inner diameter of the mounting cavity is D2, and D1>D2; and / or, the wear sleeve 30 is a steel sleeve. In the embodiment, the wear sleeve 30 is mounted into the mounting cavity of the casing 10 by means of the interference fit described above. In order to better mount the wear sleeve 30 into the mounting cavity, the outer wall diameter of the wear sleeve 30 is set in reference to the inner diameter of the mounting cavity. The outer wall diameter of the wear sleeve 30 is designed to be slightly larger than the inner diameter of the mounting cavity, so that a better interference fit can be achieved. In the embodiment, the outer wall diameter of the wear sleeve 30 refers to the distance between the opposite outer side walls of the wear sleeve 30, and the connecting line between the two outer side walls passes through the center point of the wear sleeve 30. The inner diameter of the mounting cavity refers to the distance between the opposite inner walls of the mounting cavity, and the connecting line between the two inner walls also passes through the center point of the mounting cavity. In order to achieve a better wear protection effect, the wear sleeve 30 can be a steel sleeve in the embodiment. Of course, the wear sleeve 30 can also be made of iron or steel alloy, and no specific limitation is made in this regard.

[0042] In an embodiment, the sealing member 41 comprises a first skeleton 411 and a sealing sleeve 412 sleeved outside the first skeleton 411 for sealing the gap between the rotating shaft 20 and the anti-wear sleeve 30; the inductive member 42 comprises a second skeleton 421 and a magnetic rubber 422 arranged on the side of the second skeleton 421 away from the sealing member 41, and the sealing sleeve 412 is integrally arranged with the first skeleton 411 and the second skeleton 421. In order to make the sealing member 41 and the inductive member 42 have better structural stability, in the embodiment, the sealing member 41 comprises the first skeleton 411 and the sealing sleeve 412, wherein the sealing sleeve 412 is sleeved outside the first skeleton 411, the first skeleton 411 is arranged to improve the structural stability of the sealing sleeve 412, and the sealing sleeve 412 is sleeved outside the first skeleton 411 to seal the gap between itself and the rotating shaft 20 and the gap between itself and the cavity wall of the mounting cavity, or the gap between itself and the anti-wear sleeve 30 mounted in the mounting cavity. In the embodiment, the sealing sleeve 412 and the first skeleton 411 are integrally made by a common vulcanization process. In the embodiment, the inductive member 42 comprises the second skeleton 421 and the magnetic rubber 422, and the second skeleton 421 is arranged to stably support the magnetic rubber 422 to avoid shaking of the magnetic rubber 422 when rotating synchronously with the rotating shaft 20. In the embodiment, the magnetic rubber 422 and the second skeleton 421 can also be integrally made by a common vulcanization process. Since the sealing member 41 and the inductive member 42 are integrally arranged, in the embodiment, the first skeleton 411 and the second skeleton 421 can be integrally formed by a common vulcanization process through the sealing sleeve 412. In other embodiments, the sealing sleeve 412 can be connected to the first skeleton 411 and the second skeleton 421 by gluing, and no more limitation is made in this regard. As for the first skeleton 411 and the second skeleton 421, they can be made of metal material or plastic material, and no more limitation is made in this regard.

[0043] In an embodiment, the first skeleton 411 comprises a ring portion 4111 and a flange portion 4112, the ring portion 4111 is sleeved outside the rotating shaft 20; the sealing sleeve 412 comprises a first wrapping portion 4121, a second wrapping portion 4122 and a connecting portion 4123, the first wrapping portion 4121 is sleeved at one end of the ring portion 4111 away from the flange portion 4112, the second wrapping portion 4122 is sleeved at one end of the flange portion 4112 away from the ring portion 4111, and the connecting portion 4123 is used to connect the first wrapping portion 4121 and the second wrapping portion 4122 and is located at one side of the flange portion 4112. In order to make the first skeleton 411 have a good supporting effect on the sealing sleeve 412, in the embodiment, the first skeleton 411 comprises the ring portion 4111 and the flange portion 4112, wherein the ring portion 4111 is sleeved outside the rotating shaft 20, and the flange portion 4112 is arranged at an angle with the ring portion 4111. The sealing sleeve 412 comprises the first wrapping portion 4121, the second wrapping portion 4122 and the connecting portion 4123, wherein the first wrapping portion 4121 is used to wrap one end of the ring portion 4111 away from the flange portion 4112, the second wrapping portion 4122 is used to wrap one end of the flange portion 4112 away from the ring portion 4111, and the connecting portion 4123 is used to connect the first wrapping portion 4121 and the second wrapping portion 4122. In this way, the sealing property between the sealing sleeve 412 and the first skeleton 411 can be effectively improved, so that the sealing member 41 can achieve a better sealing effect on the lubricating oil located in the mounting cavity and outside the rotating shaft 20.

[0044] In an embodiment, the first wrapping portion 4121 is provided with a mounting and fitting surface 4121a facing the surface of the rotating shaft 20, and the mounting and fitting surface 4121a is in a wavy shape in the cross section along the extension direction of the rotating shaft 20. In order to improve the sealing property between the sealing sleeve 412 and the rotating shaft 20, in the embodiment, the first wrapping portion 4121 is provided with the mounting and fitting surface 4121a on the side facing the surface of the rotating shaft 20, and the mounting and fitting surface 4121a is in a wavy shape in the cross section along the extension direction of the rotating shaft 20, that is, in a concave-convex staggered shape. In this way, the sealing effect between the first wrapping portion 4121 and the surface of the rotating shaft 20 can be effectively improved.

[0045] In an embodiment, the second wrapping portion 4122 is provided with a sealing lip 4122a and a dustproof lip 4122b protruding towards the cavity wall of the mounting cavity, and the sealing lip 4122a and the dustproof lip 4122b are arranged at an angle. In order to make the sealing sleeve 412 have good sealing effect on the lubricating oil in the mounting cavity and good dustproof effect on the dust from the outside, in the embodiment, the sealing lip 4122a and the dustproof lip 4122b are arranged on the second wrapping portion 4122 protruding towards the cavity wall of the mounting cavity. The sealing lip 4122a is arranged obliquely towards the inner side of the mounting cavity, and the diameter of the sealing lip 4122a is greater than the inner diameter of the mounting cavity, and the dustproof lip 4122b is arranged obliquely towards the cavity opening of the mounting cavity. Of course, the diameter of the dustproof lip 4122b is also greater than the inner diameter of the mounting cavity. In the embodiment, the sealing lip 4122a and the dustproof lip 4122b are arranged at an angle, so that the sealing sleeve 412 can not only have good sealing effect on the lubricating oil in the mounting cavity, but also have good dustproof effect on the dust from the outside.

[0046] In an embodiment, the inner diameter of the first wrapping portion 4121 is D3, the diameter of the shaft 20 is D4, and D3 < D4. In the embodiment, the sealing sleeve 412 is installed on the outer periphery of the shaft 20 in an interference fit manner, so the inner diameter of the first wrapping portion 4121 needs to be designed to be smaller than the diameter of the shaft 20, so that the sealing sleeve 412 can be arranged on the outer periphery of the shaft 20 in a tight fit manner. In addition, the inner diameter of the ring portion 4111 of the first skeleton 411 can be equal to or slightly greater than the diameter of the shaft 20, so as to further improve the interference fit effect.

[0047] In an embodiment, the sealing sleeve 412 and the magnetic rubber 422 are integrally formed with the second skeleton 421 in a common vulcanization manner. In the embodiment, the sealing sleeve 412 and the magnetic rubber 422 can be integrally formed with the second skeleton 421 in a common vulcanization manner, and the first skeleton 411, the sealing sleeve 412, the second skeleton 421 and the magnetic rubber 422 can also be integrally formed in a common vulcanization manner. Of course, in other embodiments, the first skeleton 411, the sealing sleeve 412, the second skeleton 421 and the magnetic rubber 422 can be separately formed and then sequentially glued by gluing, which is not limited herein.

[0048] In an embodiment, the magnetic rubber 422 is provided with a plurality of N-poles and a plurality of S-poles away from the surface of the second skeleton 421, and the plurality of N-poles and the plurality of S-poles are arranged in an interlaced manner along the circumference of the magnetic rubber 422; and / or, the inner diameter of the second skeleton 421 is D5, the diameter of the rotating shaft 20 is D4, and D5 < D4. In the embodiment, the inductor 42 is provided in the manner of using the magnetic rubber 422 and the Hall sensor 50 as described above, in order to make the Hall sensor 50 have a better sensing effect on the magnetic rubber 422, the surface of the magnetic rubber 422 facing the Hall sensor 50 is respectively provided with a plurality of N-poles and S-poles, wherein the N-poles and the S-poles are arranged in an interlaced manner along the circumference of the magnetic rubber 422, and as for the Hall sensor 50, it can be fixedly installed on the shell 10 or installed on other structures, as long as the Hall sensor 50 can keep still relative to the magnetic rubber 422. In the embodiment, the second skeleton 421 can be provided in the manner of the first skeleton 411 described above, and the inner diameter of the ring structure formed by the second skeleton 421 is also provided to be slightly smaller than the diameter of the rotating shaft 20, so that the second skeleton 421 can also be better in interference fit with the rotating shaft 20.

[0049] The above description is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation or direct / indirect application in other related technical fields within the technical concept of the present application, as described in the specification and drawings of the present application, is included in the patent protection scope of the present application.

Claims

1. A sealed sensing assembly applied to an electric machine, the electric machine comprising: a housing having a mounting cavity; a stator assembly arranged in the mounting cavity; a rotor assembly arranged in or outside the stator assembly, the rotor assembly comprising a rotating shaft; characterized in that the sealed sensing assembly comprises a sealing member and a sensing member, the sealing member is used to seal a gap between the rotating shaft and the mounting cavity, and the sensing member is arranged on one side of the sealing member and used to cooperate with an external sensor to detect a rotating position of the rotating shaft.

2. The sealed inductive assembly of claim 1, wherein, the sealing member comprises a first skeleton and a sealing sleeve, the sealing sleeve is arranged outside the first skeleton to seal the gap between the rotating shaft and the mounting cavity; the sensing member comprises a second skeleton and a magnetic rubber, the magnetic rubber is arranged on a side of the second skeleton away from the sealing member, and the sealing sleeve is integrally arranged with the first skeleton and the second skeleton.

3. The sealed inductive assembly of claim 2, wherein, the first skeleton comprises a ring portion and a flange, and the ring portion is arranged outside the rotating shaft; the sealing sleeve comprises a first wrapping portion, a second wrapping portion and a connecting portion, the first wrapping portion is arranged at an end of the ring portion away from the flange, the second wrapping portion is arranged at an end of the flange away from the ring portion, and the connecting portion is used to connect the first wrapping portion and the second wrapping portion and is arranged on one side of the flange.

4. The sealed inductive assembly of claim 3, wherein, the first wrapping portion is provided with a mounting fitting surface on a surface thereof facing the rotating shaft, and the mounting fitting surface has a wavy cross section along an extension direction of the rotating shaft.

5. The sealed inductive assembly of claim 3, wherein, the second wrapping portion is provided with a sealing lip and a dust lip on a surface thereof protruding towards a cavity wall of the mounting cavity, and the sealing lip and the dust lip are arranged at an angle.

6. The sealed inductive assembly of claim 3, wherein, an inner diameter of the first wrapping portion is D3, a diameter of the rotating shaft is D4, and D3 < D4.

7. The sealed inductive assembly of claim 2, wherein, the sealing sleeve and the magnetic rubber are integrally formed with the second skeleton by a common vulcanization process.

8. The sealed inductive assembly of claim 2, wherein, a surface of the magnetic rubber away from the second skeleton is provided with a plurality of N poles and a plurality of S poles, and the plurality of N poles and the plurality of S poles are arranged in an interlaced manner along a circumferential direction of the magnetic rubber. and / or, an inner diameter of the second skeleton is D5, a diameter of the rotating shaft is D4, and D5 < D4.

9. An electric machine characterized by comprising: a housing having a mounting cavity; a stator assembly arranged in the mounting cavity; a rotor assembly arranged in or outside the stator assembly, the rotor assembly comprising a rotating shaft; and the sealed sensing assembly of any one of claims 1 to 8 is arranged outside the rotating shaft.

10. The electric machine of claim 9, wherein, the electric machine further comprises an anti-wear sleeve arranged in the mounting cavity, and an outer wall of the anti-wear sleeve is in interference fit with an inner wall of the mounting cavity.

11. The electric machine of claim 10, wherein, a diameter of the outer wall of the anti-wear sleeve is D1, an inner diameter of the mounting cavity is D2, and D1 > D2. and / or, the anti-wear sleeve is a steel sleeve.

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