Eddy current sensor stator, eddy current sensor, motor assembly and vehicle

Abstract

The utility model discloses an eddy current sensor stator, an eddy current sensor, a motor assembly and a vehicle, and belongs to the technical field of detection. The eddy current sensor stator comprises a shell, a circuit board, a wiring terminal and a packaging layer, the shell comprises a body and an extension part, and the extension part can accommodate the wiring terminal; the circuit board is arranged on the body, a winding coil and an electronic element are arranged on the circuit board, and at least the electronic element is filled with glue on one side or two sides of the circuit board to form a packaging layer; an arc-shaped kidney-shaped hole used for fixedly installing a fastener is formed in the inner side of the circumferential edge of the body, and a protection element attached to the arc-shaped kidney-shaped hole is arranged in the arc-shaped kidney-shaped hole. At least part of the end face of the protection element in the thickness direction is flush with the end face of the arc-shaped kidney-shaped hole and / or exceeds the end face of the arc-shaped kidney-shaped hole, so that at least part of the end face of the protection element in the thickness direction can make contact with the force application face of the fastener.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of detection, more specifically, relate to a kind of eddy current sensor stator, eddy current sensor, motor assembly and vehicle. BACKGROUND

[0002] At present, the motor required by many fields such as industry, automobile electronics, aerospace, etc. needs to measure the motor rotating shaft angle and control the motor shaft rotating position; many types of gearboxes such as automobile gearboxes, etc. need to measure the rotating speed and angle of the power output input rotating shaft; diesel engine, gasoline engine, natural gas engine and other types of internal combustion engine need to measure the rotating shaft position to determine the piston top dead center to realize accurate fuel injection advance angle control; various gas turbines also need to measure the rotating speed and angle of the rotating shaft to realize power control; steering wheel rotating shaft also needs to accurately know the rotating shaft angle.

[0003] In order to realize accurate measurement of rotating element rotating angle, angle position sensor is needed for sensing, and eddy current angle position sensor is a new type of sensor for measuring rotating shaft angle position. The advantages of eddy current position sensor are good reliability (can completely replace rotary transformer position sensor), high measurement accuracy, suitable for higher rotating speed, lower cost, better electromagnetic compatibility, self-decoding, etc.

[0004] At present, the eddy current angle position sensor is composed of two stators and rotor blades, the stator is fixed on the shell, and the rotor blade is fixed on the rotating element. The existing eddy current angle position sensor stator is generally composed of three parts: plastic shell, circuit board (PCB board) and glue filling. The plastic shell is molded by mold, the circuit board is placed inside the plastic shell, and the surface is covered with winding coil and welded electronic element, and the side of the circuit board not wrapped by the shell is all treated by glue filling. For example, Chinese patent CN222773935U discloses a structure of eddy current angle position sensor stator for rotating shaft, which is only composed of PCB board and glue filling, the PCB board is provided with winding coil and electronic element, the winding coil cooperates with the eddy current position sensor rotor on the rotating shaft, and the glue filling is performed at least at the electronic element on one side or both sides of the PCB board, the glue filling strengthens the rigidity and protects the winding coil and / or electronic element.

[0005] The initial position of the eddy current angle position sensor is associated with the position of the winding coil and is irrelevant to the motor rotating shaft, so the eddy current angle position sensor is installed on the bracket and fixed after being randomly matched with the motor rotating shaft, and before use, the eddy current angle position sensor needs to verify whether there is a deviation between the initial position of the winding coil and the motor rotating shaft, so as to ensure that the signal is accurately output. However, due to the error in design and processing, the winding coil of the eddy current angle position sensor after installation and fixation deviates, which causes the initial position to be unmatched with the design, and in addition, the mounting hole on the sensor is a plurality of circular through holes, which cannot be adjusted in the circumferential direction, resulting in inaccurate signal detection output. SUMMARY

[0006] 1. PROBLEMS TO BE SOLVED

[0007] In view of the technical problems in the prior art, the utility model provides an eddy current sensor stator which can set the initial position by adjusting the angle position of the sensor and ensure the accuracy of signal detection.

[0008] The utility model also provides an eddy current sensor, a motor assembly and a vehicle.

[0009] 2. TECHNICAL SCHEME

[0010] In order to solve the above problems, the utility model adopts the following technical scheme:

[0011] The utility model discloses a kind of eddy current sensor stators, including shell, circuit board, terminal and encapsulation layer, the shell includes body and outer extension part, the outer extension part is integrally formed with body, effectively guarantee the strength requirement of whole, the outer extension part can accommodate the terminal, the terminal is electrically connected with circuit board, the outer extension part can be compared with the axial direction or radial direction of body, terminal can be connected with the cable of outside and cooperate;The body is provided with the circuit board, i.e. circuit board can be arranged in shell, especially in injection molding shell.

[0012] The outer shape profile of the body is basically circular, in the scope of the utility model, the term "basically circular" is understood as: the described body has curvature radius, and the curvature radius can be constant. Since all processing has inevitable gap, tolerance, there can be inevitable deviation.

[0013] Further, the circumferential edge of the body is provided with an arc-shaped waist hole for fixing the fastener, the arc-shaped waist hole 112 is a circumferentially continuous arc-shaped long waist hole, or is composed of a plurality of arc-shaped waist hole units arranged in the circumferential direction, the arc-shaped waist hole is provided with a protection element matched with the arc-shaped waist hole (the so-called matching can be understood as the local or overall surface-to-surface contact), so that the fastener can adjust the position of the arc-shaped waist hole; at least part of the end surface of the protection element in the thickness direction is flush with the end surface of the arc-shaped waist hole and / or exceeds part of the end surface, wherein the excess part forms a flange, which can be folded to wrap the end surface of the arc-shaped waist hole, so that at least part of the end surface of the protection element in the thickness direction can be in contact with the force surface of the fastener, such as a screw and / or a screw rod.

[0014] It should be noted that the shell of the utility model is generally an injection molded shell, when installed, the metal fastener will extrude the end surface of the arc-shaped waist hole under the action of the fastening force, causing the end surface of the arc-shaped waist hole to be extruded and damaged, the utility model sets the protection element, the metal fastener contacts the protection element to prevent the end surface of the arc-shaped waist hole from being extruded and damaged.

[0015] In addition, the above-mentioned protection element can provide structural support for the eddy current sensor, so that the eddy current sensor maintains a stable shape, and can maintain good detection accuracy during long-term operation, avoiding the problem of affecting the measurement result due to deformation of the structure itself.

[0016] The end surface of the above-mentioned protection element can be a partial end surface or a complete end surface, wherein the partial end surface corresponds to the fixed position of the fastener. Preferably, the hardness of the protection element is at least equal to the hardness of the fastener, therefore, the protection element can be made of a metal plate with a thickness of 0.2-0.5mm, such as a 304 stainless steel plate, a 316L stainless steel plate, etc., which not only has good corrosion resistance, but also has good signal shielding effect. The above-mentioned protection element is partially or mostly arranged in the circumferential direction of the circuit board, which can shield external signal interference and ensure the accuracy of sensor detection data.

[0017] The utility model can also be applied to a motor with a rotational speed of 20000r / min or even higher, so the frequency of the motor can reach MHz level. The above-mentioned stainless steel plate reflects, absorbs or attenuates external high-frequency electromagnetic waves (MHz-GHz range), such as radio frequency signals and microwaves, thereby reducing the interference or intrusion of external electromagnetic fields on the internal electromagnetic field of the sensor, avoiding the influence of external high-frequency electromagnetic waves on the detection signal, and enabling the eddy current sensor to more accurately detect the eddy current changes caused by the rotating element.

[0018] In use, when the ambient temperature suddenly increases or decreases, thermal expansion and contraction of the injection molded shell can be caused due to the sharp change in temperature, thereby affecting the measurement accuracy of the sensor, the stainless steel plate has small deformation, can reduce the volume change of the eddy current sensor, and improves the measurement accuracy of the sensor.

[0019] According to any embodiment of the first aspect of the utility model purposes, the arc waist hole has a first circular arc inner surface and a second circular arc inner surface, wherein the first circular arc inner surface and the second circular arc inner surface can have substantially the same radius of curvature, preferably, wherein the first circular arc inner surface and the second circular arc inner surface have substantially the same radius of curvature as the circular outer contour of the body, and are substantially arranged with the same center.

[0020] The circuit board, especially a "printed circuit board" (PCB board), can be arranged substantially coaxially with the axis of rotation, the circuit board is provided with winding coils (primary and secondary coils) and electronic components, the winding coils are matched with the target wheel on the rotating element (as described below in the target wheel part), and the circuit board is filled with glue at least at the electronic components on one side or both sides to form an encapsulation layer, the glue here can be black or transparent, such as epoxy resin glue, silicone glue or polyurethane potting glue, the encapsulation layer strengthens the rigidity and protects the winding coils and / or electronic components; in addition, the winding coils and electronic components can be in communication for a long time even at high rotation speed, for example, the rotation speed of the motor is 20000r / min or even higher.

[0021] In the utility model, the winding coil can be arranged coaxially with the target wheel, in the scope of the utility model, the "target wheel" can be understood as any component that can be connected with the rotating element in principle, the component is provided to cause at least one measurable signal, especially magnetic field change, when the rotating element rotates one circle while being connected with the rotating element. For example, the target wheel can be permanently or reversibly connected or connectable with the rotating element, or can also be integrally configured with the rotating element or integrated into the rotating element, the target wheel can have a rotor blade profile, the target wheel has three blades that are the same and uniformly distributed in angle.

[0022] Since all the cooperation has inevitable gap, tolerance, when arranged with the same center, it can not be exactly the same, so it can also be called "substantially arranged with the same center" here.

[0023] According to any embodiment of the first aspect of the utility model purposes, the body is equipped with the groove containing circuit board, the groove has certain depth H, under the premise of guaranteeing the body strength, for example depth is at least greater than the thickness h of circuit board, specific depth H is 4 times of thickness h, the center of the groove is provided with the installation boss that is equipped with rotating element, the through hole that is equipped with installation boss is set up on corresponding circuit board, makes circuit board be located in the center position of the body, because the existence of this depth H and the surface tension effect of pouring glue, the clearance fit of through hole and installation boss makes that pouring glue can extend to annular installation boss, is favorable to discharge the air between circuit board and encapsulation layer, avoids the emergence of air bubble in pouring glue, influences electric property.

[0024] The target wheel rotates with the rotating element, and the position change of the target wheel between the primary coil and the secondary coil causes the change of the induced voltage of the secondary coil, and the chip of the electronic element regulates and outputs analog or digital signals, so as to obtain the rotation angle data. The sensor of the utility model can output four electric signals, which are sin+, cos+, The system can calculate the rotation angle position and the motor speed of the rotating element (such as the rotating shaft of the motor) by processing the relationship between the four groups of signals; the winding coil is arranged at 360° or 180°, the precision is high, the eddy current sensor has good anti-stray magnetic field interference, thereby ensuring the precision of the sensor.

[0025] According to any embodiment of the first aspect of the utility model purposes, the cross section of the installation boss is annular, the center of the arc of the arc-shaped waist hole coincides with the center of the installation boss, and the center of the installation boss forms a space for avoiding the rotating element, for example, when the rotating element is the rotating shaft of the motor, the avoiding space is a circular hole.

[0026] According to any embodiment of the first aspect of the utility model purposes, the total length of the arc center line of the arc-shaped waist hole is 4 / 5-5 / 6 of the total length of the circumference of the circular body. Specifically, the part of the body corresponding to the electronic element cannot be provided with the arc-shaped waist hole, and the total length of the arc center line of the arc-shaped waist hole can at least surround 80% of the circumference of the body, and the maximum value is about 5 / 6. This design can ensure that the stator of the utility model is easy to install, and the structure is stable after installation.

[0027] In addition, the arc center line of the arc-shaped waist hole is relatively long, so that the above-mentioned protection element is partially or mostly surrounded in the circumferential direction of the circuit board, which can shield external signal interference and ensure the accuracy of the sensor detection data.

[0028] According to any embodiment of the first aspect of the utility model purposes, the shape of the protective element is basically same with the shape of the arc waist hole, specifically, the protective element has a first arc outer surface and a second arc outer surface, wherein the first arc outer surface and the second arc outer surface have basically same curvature radius, the first arc outer surface is attached with the first arc inner surface, and the second arc outer surface is attached with the second arc inner surface.

[0029] According to any embodiment of the first aspect of the utility model purposes, the protective element is injection molded with the body, so that the body wraps the protective element, and the protective element is not easy to fall off.

[0030] The utility model discloses a kind of eddy current sensors, including target wheel and the eddy current sensor stator of the first aspect described, the target wheel is set and is set on rotating element with eddy current sensor stator gap (current general gap is 1.3-1.7mm). The eddy current sensor of the utility model can be especially set for motor assembly traction vehicle application. In the scope of the utility model, "rotating element" is understood as any element rotating around at least one axis in principle, for example, rotating element can be shaft, for example, motor shaft of new energy vehicle.

[0031] According to any embodiment of the second aspect of the utility model purposes, the target wheel has rotor blade profile, with three identical and angularly distributed blades, and the output signal can be accurately obtained by the uniformly distributed blades.

[0032] The utility model discloses a kind of motor assemblies, including support, and the eddy current sensor of the second aspect described is fixedly installed on the support, and the eddy current sensor is cooperated with motor shaft. The motor shaft of the motor assembly is cooperated with target wheel and eddy current sensor stator, target wheel rotates along with motor shaft, and eddy current sensor stator outputs four-way electric signal.

[0033] The utility model provides a kind of vehicle, including the motor assembly of the third aspect described, and the vehicle can accurately detect rotating signal by motor assembly, ensure that vehicle travels safely.

[0034] 3. Advantage

[0035] Compared with prior art, the utility model has the beneficial effects that:

[0036] (1) The electric eddy current sensor stator of the utility model, the arc waist hole on its body and the protection element, within a certain range, make the sensor be able to rotate and adjust the installation angle, so as to achieve the purpose of adjusting the initial position; in addition, the screw rod installation position can be adjusted at will according to the customer motor installation position; the electric eddy current can also be selected at will according to the customer requirement angle;

[0037] (2) The electric eddy current sensor stator of the utility model, the through hole and the installation boss in the center of the circuit board are gap fit, make the glue pouring be able to extend to the annular installation boss, and discharge the air inside;

[0038] (3) The electric eddy current sensor stator of the utility model, the total length design of the arc center line of the arc waist hole, can guarantee the stator of the utility model to be installed conveniently, and the structure is stable after installation. BRIEF DESCRIPTION OF DRAWINGS

[0039] The technical scheme of the utility model will be described in further detail below in combination with the drawings and embodiments, but it should be known that these drawings are only designed for the purpose of explanation, thus not as the limitation of the range of the utility model. In addition, unless specially pointed out, these drawings only intend to conceptually illustrate the structural configuration described here, and not necessarily draw in proportion.

[0040] Figure 1 It is the structure schematic view of the electric eddy current sensor stator of the utility model embodiment 1;

[0041] Figure 2 It is the structure schematic view of the electric eddy current sensor of the utility model embodiment 1; Figure 1 It is the sectional view along A-A line;

[0042] Figure 3 It is the other side schematic view of the electric eddy current sensor stator of the utility model embodiment 1;

[0043] Figure 4 It is the shell structure schematic view of the electric eddy current sensor stator of the utility model embodiment 1;

[0044] Figure 5 It is the protection element structure schematic view of the electric eddy current sensor stator of the utility model embodiment 1;

[0045] Figure 6 It is the installation schematic view of the electric eddy current sensor stator of the utility model embodiment 1;

[0046] Figure 7 It is the structure schematic view of the electric eddy current sensor of the utility model embodiment 1;

[0047] Figure 8 It is the protection element structure schematic view of the electric eddy current sensor stator of the utility model embodiment 2;

[0048] Figure 9 It is a structure schematic view of the eddy current sensor stator of the utility model embodiment 3.

[0049] Figure 10 It is a structure schematic view of the eddy current sensor stator of the utility model embodiment 4.

[0050] Mark explanation:

[0051] 1, shell; 11, body; 111, circumferential edge; 112, arc waist hole; 113, first circular arc inner surface; 114, second circular arc inner surface; 115, groove body; 116, mounting boss; 117, circular arc center line; 12, protection element; 121, end face; 122, protrusion; 123, first circular arc outer surface; 124, second circular arc outer surface; 13, extension part; 2, circuit board; 21, through hole; 3, terminal; 4, packaging layer; 5, screw; 6, target wheel; 7, motor shaft. Specific implementation

[0052] The following detailed description of the exemplary embodiments of the present application refers to the accompanying drawings, that show by way of example an exemplary embodiment in which the present application can be practiced. These exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the present application, and it is to be understood that other embodiments can be utilized and that logical, mechanical and electrical changes can be made without departing from the spirit and scope of the present application. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present application is defined only by the appended claims.

[0053] The following detailed description of the present application and exemplary embodiments can be better understood with reference to the drawings, in which elements and features of the present application are designated by reference numerals.

[0054] Example 1

[0055] As Figure 7 shown, the eddy current sensor of the present embodiment includes a target wheel 6 and an eddy current sensor stator, the target wheel 6 is arranged with the eddy current sensor stator gap (at present, the general gap is 1.3-1.7mm) and is sleeved on a rotating element, Figure 7The figures are for illustrative purposes only and do not represent the actual gap size. The stator of the eddy current sensor includes a housing 1, a circuit board 2, terminals 3, and an encapsulation layer 4. The eddy current sensor of this invention is particularly suitable for vehicle applications involving motor assembly traction. Within the scope of this invention, "rotating element" is understood in principle as any element that rotates about at least one axis. For example, a rotating element can be a shaft, such as the motor shaft 7 of a new energy vehicle.

[0056] In this embodiment, combined with Figure 1 As shown, the housing 1 includes a body 11 with a circular outer contour and an extension 13. The extension 13 is integrally injection molded with the body 11. The extension 13 is square and can accommodate the wiring terminal 3 inside. The wiring terminal 3 is electrically connected to the circuit board 2. The extension 13 can be arranged radially relative to the body 11. The wiring terminal 3 can be connected and cooperated with external cables (or wire harnesses). The circuit board 2 is disposed on the body 11, that is, the circuit board 2 can be arranged in the housing 1, especially in the injection molded housing 1.

[0057] Furthermore, in Figure 1 and Figure 3 In the embodiment, an arc-shaped waist hole 112 for fixing and installing fasteners is provided on the inner side of the circumferential edge 111 of the body 11. The arc-shaped waist hole 112 is continuously distributed as a whole. A protective element 12 is built into the arc-shaped waist hole 112 and fits therewith. The protective element 12 can support the arc-shaped waist hole 112 and enable the screw 5 to adjust the position of the arc-shaped waist hole 112, providing the possibility for the sensor to rotate and adjust the installation angle within a certain range. Therefore, the protective element 12 is injection molded with the body 11. The end face of the protective element 12 along the thickness direction is flush with the end face of the arc-shaped waist hole 112, so that the end face 121 of the protective element 12 along the thickness direction can contact the force application surface of the screw 5.

[0058] like Figure 6 As shown, it should be noted that the housing 1 of this utility model is generally an injection molded housing. During installation, the metal screw 5 will squeeze the end face 121 of the arc-shaped waist hole 112 under the action of the fastening force, causing the end face of the arc-shaped waist hole 112 to be squeezed and damaged. This utility model is provided with a protective element 12, and the metal screw 5 and / or screw contact the protective element 12 to prevent the end face of the arc-shaped waist hole 112 from being squeezed and damaged.

[0059] In this embodiment, as Figure 1 and Figure 4As shown, the arc-shaped waist hole 112 has a first circular arc inner surface 113 and a second circular arc inner surface 114, wherein the first circular arc inner surface 113 and the second circular arc inner surface 114 have substantially the same radius of curvature, preferably, wherein the first circular arc inner surface 113 and the second circular arc inner surface 114 have substantially the same radius of curvature as the outer contour of the shell 1, and are arranged substantially concentrically.

[0060] In combination Figure 5 As shown, the protection element 12 has a first circular arc outer surface 123 and a second circular arc outer surface 124, wherein the first circular arc outer surface 123 and the second circular arc outer surface 124 have substantially the same radius of curvature, the first circular arc outer surface 123 is in contact with the first circular arc inner surface 113, and the second circular arc outer surface 124 is in contact with the second circular arc inner surface 114. Through the design of this structure, a smooth moving channel is provided for the adjustment of the screw rod 5, facilitating installation operation in a narrow installation space.

[0061] The end surface of the protection element 12 in the thickness direction can be a partial end surface or a complete end surface, wherein the partial end surface corresponds to the position of the screw rod 5 and / or the screw. Preferably, the hardness of the protection element 12 is greater than or equal to the hardness of the screw rod 5, so that the protection element 12 can be made of a 304 stainless steel plate with a thickness of 0.4 mm.

[0062] Further, the circuit board 2 is provided with winding coils (primary and secondary coils) and electronic elements, the winding coils cooperate with the target wheel 6 on the rotating element, and the electronic elements are glued on both sides of the circuit board 2 to form an encapsulation layer 4, wherein the glue can be black or transparent, such as epoxy resin glue, silicone glue or polyurethane potting glue, and the encapsulation layer 4 strengthens the rigidity and protects the winding coils and electronic elements.

[0063] As shown in the figure Figure 2 As shown, the body 11 is provided with a groove 115 accommodating the circuit board 2, the groove 115 has a certain depth H, which is greater than the thickness h of the circuit board 2 under the premise of ensuring the strength of the body 11, and the specific depth H is 4 times the thickness h, and a mounting boss 116 is arranged at the center of the groove 115 for the motor shaft 7 to pass through, and a through hole 21 is arranged on the corresponding circuit board 2 to cooperate with the mounting boss 116, so that the circuit board 2 is located at the center of the body 11, and the through hole 21 and the mounting boss 116 are gap-fitted, so that the glue can extend to the annular mounting boss 116 and discharge the air inside.

[0064] In Figure 2 and Figure 4In the figure, the cross-section of the mounting boss 116 is annular, the arc-shaped waist hole 112 coincides with the center of the mounting boss 116, and the center of the mounting boss 116 forms a space for the rotating element to avoid, for example, when the rotating element is a motor shaft, the avoidance space is a circular hole.

[0065] Furthermore, such as Figure 1 As shown, within the angle α range, the total length of the arc center line 117 of the arc-shaped waist hole 112 is 5 / 6 of the total circumference of the circular body 11. Specifically, the part of the body 11 corresponding to the electronic component cannot be provided with an arc-shaped waist hole. The total length of the arc center line 117 of the arc-shaped waist hole 112 can at least surround 80% of the circumference of the body 11, with a maximum value of about 5 / 6. This design ensures that the stator of this utility model is easy to install and the structure is stable after installation.

[0066] Furthermore, after extensive testing and use, it has been found that the continuous arc-shaped waist hole 112 allows the aforementioned protective element 12 to be partially or mostly arranged around the circumference of the circuit board 2, which can shield external signal interference and ensure the accuracy of the sensor detection data of this utility model.

[0067] Example 2

[0068] This embodiment has a basically the same structure as Embodiment 1, the difference being that, as Figure 8 As shown, in this embodiment, the metal protective element 12 can be arbitrarily provided with a plurality of protrusions 122 on the outer surface 123 of the first arc. For example, the cross-sectional shape of the protrusion 122 is rectangular and the height is 0.2mm. It is placed in the mold and then injection molded. The protrusion 122 can be embedded in the body 11. The protrusion 122 can increase the contact area with the body 11, thereby making the protective element 12 and the body 11 have a better bonding force. At the same time, it provides a limit for the protective element 12 from the axial and radial directions, effectively avoiding the separation between the protective element 12 and the body 11 caused by motor vibration, which would lead to slippage or detachment.

[0069] Furthermore, the protective element 12 can be made of 316L stainless steel plate with a thickness of 0.3mm, which helps to reduce the weight of the protective element 12. Further, the protective element 12 and the body 11 are injection molded; the end face 121 of the protective element 12 along the thickness direction is flush with the end face of the arc-shaped waist hole 112, so that the end face 121 of the protective element 12 along the thickness direction can contact the force-applying surface of the screw 5, and the screw 5 will not cause damage to the body 11.

[0070] Example 3

[0071] like Figure 9As shown, the shell 1 is substantially circular in shape, and includes a circular body 11 and an extension 13 integrally injection molded with the body 11. The square extension 13 can accommodate the terminal 3, which is electrically connected to the circuit board 2. The extension 13 can be radially arranged relative to the body 11, and the terminal 3 can be connected to a cable from the outside. The circuit board 2 is arranged on the body 11, i.e., the circuit board 2 can be arranged in the shell 1, especially in the injection molded shell 1.

[0072] In Figure 9 the protection element 12 extends beyond the end surface of the arc-shaped waist hole 112 in the thickness direction, and the excess part can be folded to wrap around the end surface of the arc-shaped waist hole 112. This helps to increase the contact area between the screw 5 and the protection element 12, effectively increasing the friction, so that the sensor is firmly fixed on the bracket and is not easy to shift.

[0073] Example 4

[0074] As Figure 10 shown, the shell 1 includes a circular body 11 and an extension 13 integrally injection molded with the body 11. The extension 13 can accommodate the terminal 3, which is electrically connected to the circuit board 2. The extension 13 can be radially arranged relative to the body 11, and the terminal 3 can be connected to a cable from the outside. The circuit board 2 is arranged on the body 11, i.e., the circuit board 2 can be arranged in the shell 1, especially in the injection molded shell 1.

[0075] Further, the arc-shaped waist hole 112 is divided into five equal intervals with the same center, and the total length of the arc center line 117 of the arc-shaped waist hole 112 is 4 / 5 of the total length of the circular body 11. The arc-shaped waist hole 112 has a protection element 12 fitted therein, so that the screw 5 can be adjusted in position relative to the arc-shaped waist hole 112, providing the possibility of rotating the sensor to adjust the installation angle within a certain range. Therefore, the protection element 12 and the body 11 are injection molded. The end surface of the protection element 12 in the thickness direction is flush with the end surface of the arc-shaped waist hole 112, so that the end surface of the protection element 12 in the thickness direction can be in contact with the force surface of the screw 5.

[0076] The utility model is described above and its embodiments are described schematically, which is not restrictive, and the drawings only show one of the embodiments of the utility model, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the utility model, without departing from the utility model, similar structural modes and embodiments are designed without creativity, which should belong to the protection scope of the utility model.

Claims

1. An eddy current sensor stator, comprising a housing (1), a circuit board (2), a terminal (3) and an encapsulation layer (4), the housing (1) comprising a body (11) and an extension (13) capable of accommodating the terminal (3); the circuit board (2) is arranged on the body (11) and is provided with winding coils and electronic components; the circuit board (2) is glued on one side or both sides at least at the electronic components and forms an encapsulation layer (4); characterized in that, an arc-shaped waist hole (112) for fixing and mounting a fastener is arranged on the inner side of the circumferential edge (111) of the body (11), and a protective element (12) is arranged in the arc-shaped waist hole (112) and is attached to the arc-shaped waist hole (112). At least part of the end surface (121) of the protective element (12) in the thickness direction is flush with or exceeds the end surface of the arc-shaped waist hole (112), so that at least part of the end surface (121) of the protective element (12) in the thickness direction can be in contact with the force surface of the fastener. The arc-shaped waist hole (112) has a first circular arc inner surface (113) and a second circular arc inner surface (114), which have substantially the same curvature radius as the circular outer contour of the body (11) and are arranged substantially with the same center.

2. The eddy current sensor stator of claim 1, wherein, The arc-shaped waist hole (112) is a circumferentially continuous arc-shaped long waist hole.

3. The eddy current sensor stator of claim 1 or 2, wherein, The fastener is a screw and / or a screw rod (5).

4. The eddy current sensor stator of claim 1 or 2, wherein, The body (11) is provided with a groove (115) for accommodating the circuit board (2), and a mounting boss (116) for a rotating element is arranged at the center of the groove (115).

5. The eddy current sensor stator of claim 3, wherein, The groove (115) has a certain depth H, which is at least greater than the thickness h of the circuit board (2).

6. The eddy current sensor stator of claim 5, wherein, The through hole (21) and the mounting boss (116) are gap-fitted, so that the glue can extend to the annular mounting boss (116) and discharge air.

7. The eddy current sensor stator of claim 6, wherein, The cross section of the mounting boss (116) is annular, and the circular arc center of the arc-shaped waist hole (112) coincides with the center of the mounting boss (116).

8. The eddy current sensor stator of claim 7, wherein, The total length of the circular arc center line (117) of the arc-shaped waist hole (112) is 4 / 5-5 / 6 of the total length of the circular body (11).

9. The eddy current sensor stator of any of claims 1-2, wherein, The protective element (12) has a first circular arc outer surface (123) and a second circular arc outer surface (124), which have substantially the same curvature radius, the first circular arc outer surface (123) is attached to the first circular arc inner surface (113), and the second circular arc outer surface (124) is attached to the second circular arc inner surface (114).

10. The eddy current sensor stator of claim 9, wherein, The protective element (12) is made of a metal plate with a thickness of 0.2-0.5 mm.

11. The eddy current sensor stator of claim 10, wherein, The protective element (12) and the body (11) are injection molded, so that the body (11) wraps the protective element (12).

12. The eddy current sensor stator of claim 10, wherein, ​ 13. The eddy current sensor stator of claim 12, wherein, ​ 14. The eddy current sensor stator of claim 12, wherein, The protection element (12) is provided with a protrusion (122) along the outer side, so that the protrusion (122) can be embedded in the body (11).

15. An eddy current sensor comprising a target wheel (6) and an eddy current sensor stator, the target wheel (6) being sheathed with the eddy current sensor stator gap and arranged on a rotating element, characterized in that, The eddy current sensor stator is the eddy current sensor stator of any one of claims 1-14.

16. The eddy current sensor of claim 15, wherein, The target wheel (6) has a rotor blade profile with three identical and uniformly angularly distributed blades.

17. An electric machine assembly comprising a bracket, characterized in that And the eddy current sensor of claim 15 fixedly installed on the bracket cooperates with the motor rotating shaft (7).

18. A vehicle characterized by comprising: The motor assembly comprises the motor assembly of claim 17. The motor assembly comprises the motor assembly of claim 17.

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