Motor

Abstract

The utility model relates to a motor. The motor comprises a stator, a rotor, a shell and a sensing element, the stator is fixed in an inner cavity of the shell, the rotor is rotatably installed in the inner cavity of the shell, the sensing element is configured to detect physical parameters in the shell, the motor further comprises a wrapping structure, and the sensing element is fixed in the inner cavity of the shell and wrapped in the wrapping structure. According to the motor of the utility model, the installation mode of the sensing element is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, specifically, the utility model relates to a kind of motor with built-in sensing element. BACKGROUND

[0002] Motor is the driving mechanism for generating torque, widely used in various mechanical devices. In order to monitor and control the running state of the motor, some sensing elements need to be installed on the motor. These sensing elements are usually electrical components. For application scenarios such as pump devices, there is a liquid medium inside the motor. In this case, on the one hand, in order to meet the waterproof needs of the sensing elements, on the other hand, in order to facilitate signal and power transmission with external control or power supply devices through cables, some sensing elements are arranged outside the housing of the motor. However, for sensing elements such as rotary position sensors, they need to be arranged close to the sensing source on the motor shaft in order to detect the rotational position of the motor shaft. In the prior art, such sensing elements are usually fixed outside the sealing cover, and then the sealing cover is installed on the housing of the motor in a sealed manner. This makes the structure of the housing and the assembly process more complex. At the same time, the sealing structure of the sealing cover is limited in effect and prone to aging failure, so there is a risk of leakage. In addition, since the sensing element and the sensing source (magnet) inside the housing are separated by the sealing cover, and the sensing source installed on the motor shaft needs to be spaced a safe distance from the sealing cover, the sensing distance between the sensing element and the sensing source is too large, which affects the detection accuracy. SUMMARY

[0003] Therefore, the technical problem to be solved by the utility model is to provide a motor with an improved sensing element installation method.

[0004] The above technical problem is solved by a motor according to the utility model. The motor includes a stator, a rotor, a housing, and a sensing element, the stator is fixed in the inner cavity of the housing, the rotor is rotatably installed in the inner cavity of the housing, the sensing element is configured to detect a physical parameter inside the housing, the motor further includes a cladding structure, the sensing element is fixed in the inner cavity of the housing and cladded in the cladding structure. The cladding structure can be a structure formed by injection molding process or potting process. By cladding the sensing element in the cladding structure, the sensing element can be effectively sealed and protected, so that the sensing element can be safely arranged inside the housing of the motor.

[0005] According to a preferred embodiment of the utility model, the motor can further include a terminal block, the terminal block is fixedly arranged between the axial end of the stator and the axial end wall of the inner cavity of the housing, and the sensing element can be fixedly arranged on the terminal block. The terminal block can be a terminal block for connecting the lead wires of the stator winding. By integrating the sensing element on the terminal block, the sensing element can be conveniently installed inside the housing.

[0006] According to another preferred embodiment of the utility model, the inductive element can be arranged on the side of the collecting plate which axially faces the stator. This brings the inductive element closer to the stator and the rotor inside the housing.

[0007] According to another preferred embodiment of the utility model, the stator, the collecting plate and the inductive element can be collectively coated by the coating structure. That is, the inductive element can be coated into the coating structure together during the coating process which forms a sealed stator and collecting plate.

[0008] According to another preferred embodiment of the utility model, the motor can further include a motor shaft, the motor shaft is coaxially arranged on the radially inner side of the stator and the rotor and is fixedly connected with the rotor, and the inductive element is aligned with the motor shaft to detect the physical parameter of the motor shaft. The physical parameter detected by the inductive element is, for example, the rotational position of the motor shaft, that is, the rotational position of the rotor.

[0009] According to another preferred embodiment of the utility model, there can be an axial gap between the coating structure and the axial end of the motor shaft which faces the collecting plate. Thus, the rotation of the motor shaft can be avoided.

[0010] According to another preferred embodiment of the utility model, the motor can further include an inductive source, the inductive source is fixed on the axial end of the motor shaft which faces the collecting plate, and the inductive element is aligned with the inductive source to detect the rotational position of the motor shaft through the inductive source. The inductive source may, for example, be a magnet for generating a magnetic field.

[0011] According to another preferred embodiment of the utility model, the housing can include a plurality of support structures which protrude axially from the axial end wall facing the stator towards the motor shaft, the plurality of support structures are spaced apart circumferentially around the motor shaft, the motor shaft is rotatably supported on the plurality of support structures, the collecting plate can include an outer ring portion, a center portion and a plurality of spoke portions, the center portion is located radially inside the outer ring portion and is spaced apart from the outer ring portion in the radial direction, the plurality of spoke portions are spaced apart circumferentially and are respectively connected in the radial direction between the outer ring portion and the center portion, each support structure can extend through the collecting plate between the corresponding two adjacent spoke portions, and the inductive element can be arranged on the center portion. The collecting plate avoids the support structures of the motor shaft through this structure.

[0012] According to another preferred embodiment of the utility model, the collecting plate can further include a lead cable connected to the outer ring portion, and the signal line and / or the power line of the inductive element are led out of the housing via the lead cable. Thus, the built-in inductive element is connected with the external signal and power.

[0013] According to another preferred embodiment of the utility model, the motor can be configured as an axial flux motor, the collecting plate, the stator and the rotor are distributed in the axial direction, so that the stator is located between the collecting plate and the rotor in the axial direction. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings. In the drawings, the same reference numerals represent elements with the same function. Wherein:

[0015] Figure 1 A longitudinal sectional view of an electric motor according to an exemplary embodiment of the present invention is shown;

[0016] Figure 2 A perspective view of a hub for a motor according to an exemplary embodiment of the present invention is shown;

[0017] Figure 3 A perspective view of a stator assembly according to an exemplary embodiment of the present invention is shown; and

[0018] Figure 4 A perspective sectional view of a stator assembly mounted in a housing according to an exemplary embodiment of the present invention is shown. Detailed Implementation

[0019] The following describes specific embodiments of the motor according to the present invention with reference to the accompanying drawings. The detailed description and drawings below are provided to exemplify the principles of the present invention. The present invention is not limited to the described preferred embodiments, and the scope of protection of the present invention is defined by the claims.

[0020] According to an embodiment of the present invention, a motor having a built-in sensing element is provided. Figures 1 to 4 An exemplary embodiment of the motor according to the present invention is shown.

[0021] like Figure 1 As shown, the motor includes a housing 10, a stator 20, a rotor 30, and a motor shaft 40. The housing 10 may be formed as a generally hollow cylindrical structure. The stator 20 is fixedly mounted in the inner cavity of the housing 10. The stator 20 is generally formed as a generally cylindrical structure and extends radially inward along the axial direction. The stator 20 may include a stator core and coil windings wound on the stator core. To seal the stator 20, a covering structure 80 is provided on the stator 20. The covering structure 80 may be an injection-molded covering structure formed by an injection molding process or a potting covering structure formed by a potting process.

[0022] The rotor 30 is also formed as a substantially cylindrical structure and is coaxially arranged in the inner cavity of the housing 10. The motor shaft 40 is formed as a substantially cylindrical structure, which is coaxially arranged radially inside the stator 20 and the rotor 30. The motor shaft 40 axially penetrates the rotor 30 and is fixedly connected with the rotor 30. The motor shaft 40 is rotatably supported on the housing 10, so that the rotor 30 and the motor shaft 40 can be synchronously rotated relative to the housing 10 and the stator 20 around a common central axis. In Figure 1 In the embodiment shown, the rotor 30 is axially staggered with the stator 20, thereby forming an axial flux motor. The device driven by the motor, for example the pump assembly 50, is also axially distributed with the stator 20 and the rotor 30, so that the rotor 30 is axially located between the stator 20 and the pump assembly 50.

[0023] In order to detect some physical parameters inside the housing 10, the motor further comprises an inductive element 60. There is a liquid medium inside the housing 10 of the motor, for example due to the use for driving the pump assembly 50. In the prior art, in order to protect the inductive element 60 as an electrical component, the inductive element 60 is usually arranged outside the housing 10. Unlike the prior art, in the utility model, the inductive element 60 is fixed in the inner cavity of the housing 10 and also covered in the covering structure 80. As described before, the covering structure 80 is a structure formed by the injection molding process or the potting process, by completely covering the inductive element 60 into the covering structure 80, the inductive element 60 can be effectively sealed and insulated.

[0024] As Figure 1 shown, the motor further comprises a terminal board 90. The terminal board 90 is a circuit board for integrally arranging the coils of the stator 20 and the lead wires of the electrical components in the motor. The terminal board 90 is fixedly arranged between the axial end of the stator 20 and the axial end wall of the inner cavity of the housing 10. Various lines integrated into the terminal board 90 are led out of the housing 10 through one or more lead cables 94 on the terminal board 90 in order to be connected with external power supply or control device. A corresponding sealing ring can be provided between each lead cable 94 and the lead-out hole of the housing 10 for sealing (see Figure 4 ). In order to facilitate the lead-out of the lead cable 94 from the housing 10, the terminal board 90 is axially located on the side of the stator 20 away from the device driven by the motor, for example the pump assembly 50. Therefore, for the axial flux motor, the terminal board 90, the stator 20, the rotor 30 and the device driven by the motor, for example the pump assembly 50, are sequentially distributed in the axial direction.

[0025] In the preferred embodiment according to the present application, the inductive element 60 can be fixedly arranged on the terminal board 90, so as to be installed into the housing 10 together with the terminal board 90. In this case, the signal line and / or the power line of the inductive element 60 are also integrated into the terminal board 90 and led out of the housing 10 via one or more lead cables 94 of the terminal board 90 (see Figure 4 ). In particular, the inductive element 60 can be preferably arranged on the side of the terminal board 90 which axially faces the stator 20, so as to be closer to the structures inside the motor. At this time, the stator 20, the terminal board 90 and the inductive element 60 can be collectively covered by the covering structure 80. For the stator 20 which is covered by the injection molding process, the stator 20, the terminal board 90 and the inductive element 60 can be first assembled together; then, the covering structure 80 is applied on the outer surfaces of the stator 20, the terminal board 90 and the inductive element 60 by the injection molding process, so as to form the stator assembly as shown in Figure 3 ; finally, the stator assembly is integrally installed into the housing 10 as shown in Figure 4 . For the stator 20 which is covered by the potting process, the stator 20, the terminal board 90 and the inductive element 60 can be first installed in place in the housing 10, then the glue is poured and solidified, and finally the covering structure 80 as shown in Figure 4 is formed.

[0026] In the preferred embodiment, the inductive element 60 can be a component for detecting the physical parameters of the rotating part in the motor, in particular the rotor 30 and the motor shaft 40. For example, the inductive element 60 can be an angle sensor for detecting the rotational position of the rotor 30 and the motor shaft 40. Since the motor shaft 40 is fixed together with the rotor 30, the rotational positions of the two are the same, and thus detecting the rotational position of the motor shaft 40 is equivalent to detecting the rotational position of the rotor 30. In order to facilitate the detection of the physical parameters of the motor shaft 40, the inductive element 60 is preferably arranged on the terminal board 90 in alignment with the motor shaft 40. At this time, a predetermined size of axial gap can be provided between the covering structure 80 covering the inductive element 60 and the axial end of the motor shaft 40 facing the terminal board 90, so as to avoid the interference of the components on the terminal board 90 with the rotation of the motor shaft 40.

[0027] For some types of sensors, it is also necessary to provide an inductive source 70 on the motor shaft 40 which is aligned with the inductive element 60. The inductive source 70 is fixed on the axial end of the motor shaft 40 facing the terminal board 90, and the inductive element 60 is aligned with the inductive source 70. For example, for the angle sensor, the inductive source 70 can be a magnet for generating a magnetic field, and the inductive element 60 can determine the rotational position of the motor shaft 40 through the magnetic field generated by the inductive source 70.

[0028] As shown in Figure 1As shown, in order to support the motor shaft 40, in some embodiments, the housing 10 can be formed with a plurality of support structures 11 which respectively protrude axially from the axial end wall of the housing 10 facing the stator 20 towards the motor shaft 40. These support structures 11 are distributed circumferentially, particularly uniformly, around the motor shaft 40 on the radially outer side thereof, so that the motor shaft 40 is rotatably supported on these support structures 11. A bearing can be provided between these support structures 11 and the motor shaft 40 to allow rotation of the motor shaft 40 relative to the support structures 11. In order to allow these support structures 11 to pass through the terminal plate 90, the terminal plate 90 can be formed with a structure as shown in Figure 2 Figure 2 As shown, the terminal plate 90 can include an outer ring portion 91, a center portion 92 and a plurality of spoke portions 93. The outer ring portion 91 is formed in a substantially annular shape, the center portion 92 is formed in a substantially disc shape, and the center portion 92 is disposed substantially coaxially on the radially inner side of the outer ring portion 91 and is spaced apart from the outer ring portion 91 in the radial direction. Each spoke portion 93 is connected in the radial direction between the outer ring portion 91 and the center portion 92. These spoke portions 93 are distributed circumferentially, particularly uniformly, so that an aperture is formed between any two adjacent spoke portions 93. Each support structure 11 extends through the terminal plate 90 between the corresponding two adjacent spoke portions 93. When the terminal plate 90 is mounted into the housing 10, the center portion 92 of the terminal plate 90 is substantially aligned with the motor shaft 40. The inductive element 60 is fixedly arranged on the center portion 92, so as to be aligned with the motor shaft 40. In this case, the lead cable 94 of the terminal plate 90 can be connected to the outer ring portion 91, and the lead cable 94 of the terminal plate 90 is led out of the housing 10 from the side of the outer ring portion 91 facing away from the stator 10.

[0029] Although the technical solution of the present application is described in the above embodiments by taking an axial flux motor as an example, it should be understood that the above technical solution is also applicable to other types of motors. Specifically, the rotor 30 can be arranged axially overlapping the stator 20 on the radially inner side of the stator 20. In this case, the inductive element 60 is still mounted into the housing 10 in the manner in the above embodiments.

[0030] In the motor according to the present application, the inductive element for detecting the physical parameter inside the motor can be sealed and insulated by the cladding structure, which makes it possible to directly mount the inductive element inside the housing even for the motor with liquid medium inside. This solution can significantly simplify the mounting manner of the inductive element and the structure of the motor, thereby reducing both the manufacturing cost and the risk of leakage. At the same time, the inductive element can be closer to the detection target, particularly the inductive source inside the housing, thereby effectively improving the detection accuracy.

[0031] ​While the possible embodiments have been described in the specification, it should be understood that there exist numerous modifications, combinations, sub-combinations, and permutations of the possible embodiments that will be readily apparent to those having skill in the art, as defined by the claims, without departing from the scope of the present disclosure. Moreover, unless specifically noted, aspects from the different embodiments can be mixed and matched. Accordingly, the description is not intended to limit the scope of the disclosure to the described embodiments. The specification, claims, and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

[0032] List of reference signs

[0033] 10 housing

[0034] 11 support structure

[0035] 20 stator

[0036] 30 rotor

[0037] 40 motor shaft

[0038] 50 pump assembly

[0039] 60 inductive element

[0040] 70 inductive source

[0041] 80 covering structure

[0042] 90 busbar

[0043] 91 outer ring portion

[0044] 92 center portion

[0045] 93 spoke portion

[0046] 94 lead cable

Claims

1. An electric machine comprising a stator (20), a rotor (30), a housing (10) and a sensing element (60), the stator (20) being fixed in an inner cavity of the housing (10), the rotor (30) being rotatably mounted in the inner cavity of the housing (10), the sensing element (60) being configured to detect a physical parameter within the housing (10), characterized in that the electric machine further comprises a cladding structure (80), the sensing element (60) being fixed in the inner cavity of the housing (10) and being cladded in the cladding structure (80). the electric machine further comprises a hub plate (90) fixedly arranged between an axial end of the stator (20) and an axial end wall of the inner cavity of the housing (10), the sensing element (60) being fixedly arranged on the hub plate (90).

2. The electric machine of claim 1, wherein, the sensing element (60) is arranged on a side of the hub plate (90) axially facing the stator (20).

3. The electric machine of claim 2, wherein, the stator (20), the hub plate (90) and the sensing element (60) are jointly cladded by the cladding structure (80).

4. The electric machine of claim 3, wherein, the electric machine further comprises a machine shaft (40) coaxially arranged radially inside the stator (20) and the rotor (30) and fixedly connected with the rotor (30), the sensing element (60) being aligned with the machine shaft (40) to detect a physical parameter of the machine shaft (40).

5. The electric machine of claim 4, wherein, an axial gap exists between the cladding structure (80) and an axial end of the machine shaft (40) facing the hub plate (90).

6. The electric machine of claim 5, wherein, the electric machine further comprises an induction source (70) fixed at an axial end of the machine shaft (40) facing the hub plate (90), the sensing element (60) being aligned with the induction source (70) to detect a rotational position of the machine shaft (40) by the induction source (70).

7. The electric machine of claim 6, wherein, the housing (10) comprises a plurality of support structures (11) protruding axially from an axial end wall facing the stator (20) towards the machine shaft (40), the plurality of support structures (11) being circumferentially spaced around the machine shaft (40), the machine shaft (40) being rotatably supported on the plurality of support structures (11), the hub plate (90) comprises an outer ring portion (91), a center portion (92) radially inside and spaced from the outer ring portion (91), and a plurality of spoke portions (93) circumferentially spaced and respectively connected in radial direction between the outer ring portion (91) and the center portion (92), each support structure (11) extends through the hub plate (90) between two adjacent spoke portions (93), the sensing element (60) is arranged on the center portion (92).

8. The electric machine of claim 5, wherein, ​ 9. The electric machine of claim 8, wherein, The hub plate (90) further comprises a lead-out cable (94) connected to the outer ring portion (91), via which a signal line and / or a power supply line of the inductive element (60) is led out of the housing (10).

10. The electric machine of any one of claims 2 to 9, characterized by The electric machine is configured as an axial flux electric machine, the hub plate (90), the stator (20) and the rotor (30) being distributed in an axial direction, such that the stator (20) is located axially between the hub plate (90) and the rotor (30).

Images