An eddy current sensor integrated with a conductive member, a motor assembly and a motor

Abstract

The utility model relates to a contactless detection technical field, concretely relates to an electric eddy current sensor integrated with electrically conductive part, motor assembly and motor. An electric eddy current sensor integrated with electrically conductive part, including: the reflection target is arranged to be able to fix the extension of reflection target and motor shaft, at least partial sleeve setting on the casing of motor shaft, and the coil board, interval portion and electrically conductive part that are sequentially fixed in casing, the electrically conductive part includes with casing opposite fixed and with ground piece electricity connection electrically conductive part, electricity connection motor shaft and electrically conductive connecting piece, and the fixed part of the electrically conductive connecting piece with the electrically conductive part or extension opposite fixed, the coil board is used to send signal, and process based on receiving from the signal of reflection target reflection, to obtain the motion information of motor shaft, the interval portion has the shape of the interval arrangement of the coil board and the electrically conductive part electrically conductive part.

Description

Technical Field

[0001] This utility model relates to the field of non-contact detection technology, specifically to an eddy current sensor, motor assembly, and motor integrated with conductive components. Background Technology

[0002] Servo motor shaft voltage refers to the potential difference between the motor's rotating shaft (i.e., the motor shaft) and the stator (or ground, grounding device). If the shaft voltage exceeds the bearing insulation threshold, it will break down the lubricating grease, forming a shaft current, leading to bearing electrolytic corrosion damage (such as raceway pitting and grease carbonization), which is a common reliability issue in servo systems. To solve this problem, existing technologies use conductive components to electrically connect the motor shaft and the grounding device, thereby effectively eliminating shaft voltage and improving the motor's lifespan.

[0003] Meanwhile, in order to detect the motion information of the motor shaft, existing technologies often require the installation of eddy current sensors on the motor shaft. Eddy current sensors are non-contact measurement sensors based on the eddy current effect, which have the characteristics of high linearity and high resolution, and are widely used in industrial automation, new energy vehicle motors, aerospace and other fields.

[0004] In existing technologies, eddy current sensors and conductive components are two separate parts that require separate installation and arrangement. This makes installation complex and places greater demands on the space required for the motor shaft, thus hindering the further development of related technologies. Utility Model Content

[0005] This invention provides an eddy current sensor, a motor assembly, and a motor with integrated conductive components, to solve the technical problem of excessive space occupation of the motor shaft in the prior art.

[0006] In a first aspect, this utility model provides an eddy current sensor integrated with a conductive element, comprising: a reflective target, an extension configured to fix the reflective target and a motor shaft, a housing at least partially sleeved on the motor shaft, and a coil plate, a spacer, and a conductive element sequentially fixed within the housing; the conductive element includes a conductive portion fixed relative to the housing and electrically connected to a grounding element, a conductive connector electrically connecting the extension and the conductive portion, the conductive connector being fixed relative to the conductive portion or the extension; the coil plate is used to emit signals and process signals received from the reflective target to obtain motion information of the motor shaft; the spacer has a shape that spaces the conductive portions of the coil plate and the conductive element apart.

[0007] Optionally, in some embodiments of this utility model, the conductive connector is fixed to the conductive part by the fixing part, and a plurality of conductive connectors are fixed on the conductive part and electrically contact the extension part. The conductive connectors are arranged radially along the motor shaft, wherein the conductive part is a plate-shaped structure with a connection hole fixed relative to the housing, and the connection hole is configured to accommodate the extension part; or, the conductive part is an annular structure fixed relative to the housing, and a plurality of conductive connectors are fixedly arranged on the inner wall of the conductive part.

[0008] Optionally, in some embodiments of the present invention, the conductive connector is fixed to the conductive part by the fixing part, the conductive connector is arranged along the axial direction of the motor shaft, the conductive part is fixed relative to the housing, and a plurality of the conductive connectors pass through the housing to make electrical contact with the extension provided at the end of the motor shaft.

[0009] Optionally, in some embodiments of this utility model, a plurality of the conductive connectors are fixedly disposed on the outer wall of the extension and arranged radially along the motor shaft; wherein the conductive part is an annular structure fixed relative to the housing, and the conductive part is configured to make electrical contact with the conductive connectors.

[0010] Optionally, in some embodiments of this utility model, the conductive connector is fixed to the extension by the fixing part, the conductive connector is arranged along the axial direction of the motor shaft, and the extension is arranged at the end of the motor shaft; the conductive part is a plate-shaped structure fixed relative to the housing, and the conductive connector is arranged on the side of the extension facing the conductive part and can be electrically contacted with the conductive part.

[0011] Optionally, in some embodiments of this utility model, the extension is part of the motor shaft, or part of the reflective target, or is independently arranged relative to the reflective target and the motor shaft; and / or, the conductive connector is a conductive fiber bundle or a flexible or elastic contact structure made of conductive polymer material or modified metal rod.

[0012] Optionally, in some embodiments of the present invention, the housing includes a fixedly disposed base and an annular portion; the base includes a base plate and a side plate fixedly disposed along the edge of the base plate, the base plate having a through hole through which a motor shaft or extension can pass; the annular portion is disposed around the through hole to form an open cavity with the base plate and the side plate; wherein the coil plate and the conductive element are housed in the open cavity and fixedly connected to the housing; optionally, the spacer portion is a partition plate disposed on the conductive element and the eddy current sensor, the partition plate being independent of the housing; or, the spacer portion is disposed on the housing to space the coil plate and the conductive element; or, the annular portion is the spacer portion.

[0013] Optionally, in some embodiments of this utility model, an epoxy resin is further included, which is disposed within the opening cavity to at least encapsulate the housing, the coil plate, and the conductive element into a single unit; and / or, the base is sleeved on the motor shaft and fixedly connected to the grounding element, the grounding element being the outer shell of the motor; the housing further includes a connecting portion, which is fixedly disposed on the side plate of the base and detachably connected to the outer shell of the motor; wherein a metal tube with a through hole is fixedly provided on the connecting portion, and the housing is detachably connected to the outer shell of the motor through the through hole of the metal tube.

[0014] A second aspect of this utility model provides a motor assembly, including a motor and an eddy current sensor with integrated conductive elements as described in the first aspect of this utility model; the reflective target is fixedly sleeved on the motor shaft of the motor; the housing is sleeved on the motor shaft and detachably fixed to the outer casing of the motor; the outer casing of the motor is grounded; wherein the reflective target is disposed closer to the axis of the motor than the housing.

[0015] A third aspect of this utility model provides a motor for detachably fixing to an eddy current sensor with integrated conductive elements as described in the first aspect of this utility model. The motor has a motor shaft, and a reflective target is fixedly sleeved on the motor shaft via an extension. A housing is sleeved on the motor shaft and detachably fixed to the motor housing. The motor housing is grounded.

[0016] The beneficial effects of the solution provided by this utility model are as follows: By setting the coil plate and conductive component inside the housing, and by integrating the coil plate and conductive component, the mounting position of the eddy current sensor and conductive component on the entire motor shaft can be significantly reduced. Compared with existing servo motors and frequency converter motors, the original two mounting components are replaced with one mounting component, saving installation space, reducing assembly steps, and optimizing interference to the entire system after reducing shaft voltage. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an eddy current sensor with integrated conductive elements provided in a specific embodiment of this utility model; Figure 2 This is a schematic diagram of the structure of an eddy current sensor with integrated conductive elements provided in a specific embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of an eddy current sensor with integrated conductive elements provided in a specific embodiment of this utility model; Figure 4 This is a schematic diagram of the structure of an eddy current sensor with integrated conductive elements provided in a specific embodiment of this utility model; Figure 5 This is a schematic diagram of the structure of an eddy current sensor with integrated conductive elements provided in a specific embodiment of this utility model; Figure 6 This is a schematic diagram of the structure of an eddy current sensor with integrated conductive elements provided in a specific embodiment of this utility model.

[0019] Figure label: 100. Housing; 110. Base; 111. Base plate; 112. Side plate; 113. Through hole; 120. Ring; 121. Mounting groove; 130. Connecting part; 131. Metal tube; 140. Conductive grounding wire; 141. Circular ring segment; 142. Rod segment; 210. Eddy current coil plate; 220. Reflective target; 221. Extension section; 222. Target piece; 230. Eddy current conductor; 300. Spacing section; 400. Conductive component; 410. Conductive part; 411. Connecting hole; 420. Fixing part; 430. Conductive connector; 500, epoxy adhesive. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only used for illustration and explanation of the present utility model, and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "up," "down," "left," "right," "front," and "back" generally refer to up, down, left, and right in the actual use or working state of the device, specifically the drawing directions in the accompanying drawings.

[0021] It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of embodiments of this utility model. Furthermore, the descriptions of each embodiment in the following embodiments have their own emphasis; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0022] Example 1 Please see Figure 1 The figure shows an eddy current sensor integrated with a conductive element. The eddy current sensor with integrated conductive element is fixed relative to the motor housing. The eddy current sensor with integrated conductive element includes a housing 100, an eddy current coil plate 210, a reflective target 220, an extension 221, a spacer 300, and a conductive element 400. The housing 100 is detachably fixed to the motor housing and has an open cavity. The eddy current coil plate 210, the spacer 300, and the conductive element are sequentially housed within the cavity of the housing 100 and fixed within the housing 100 by epoxy resin. The conductive element contacts a grounding element (e.g., the housing 100) and contacts the motor shaft through a conductive connector 430. In this embodiment, the conductive connector 430 is a bundle of conductive fibers, enabling contact between the motor shaft and the grounding element to complete conductivity. The reflective target 220 is fixedly mounted on the motor shaft through the extension 221 and can reflect the signal emitted from the eddy current coil plate 210. The eddy current coil plate 210 can emit signals and receive signals reflected from the self-reflecting target to calculate the motion information of the motor shaft based on the reflected signals.

[0023] It should be noted that the conductive connector 430 can be a bundle of conductive fibers composed of multiple conductive fibers, but it is not limited to this. In an alternative embodiment, the conductive connector 430 is a conductive polymer material. In yet another alternative embodiment, the conductive connector 430 is a modified metal rod, such as a carbon rod with added silver and copper, or a modified copper metal such as super copper (graphite copper).

[0024] It should also be noted that the extension 221 is used to fix the reflector 220 to the motor shaft. The extension 221 can be a part of the motor shaft or an extension of the motor shaft, and the extension 221 can also be a part of the reflector 220 or an extension thereof. Naturally, the extension 221 can also be a separate component provided independently of the motor shaft and the reflector 220.

[0025] Preferably, the target material is an annular component having a cavity that matches a portion of the motor shaft. It may be open at one end for fixed installation at the end of the motor shaft, or open at both ends for fixed installation at a specific location on the motor shaft.

[0026] Specifically, the housing 100 includes a base 110, a ring 120, and a connecting portion 130 that are fixedly connected. The base 110 can be sleeved on the motor shaft and fixed to the grounded motor housing (not shown in the figure). The base 110 includes a base plate 111 and a side plate 112 fixed to the base plate 111 along the edge of the base plate 111. Figure 1 In this specific embodiment, the substrate 111 is an irregular plate formed by a combination of circles and rectangles, and the side plate 112 surrounds the side wall of the substrate 111.

[0027] The base plate 111 of the base 110 has a through hole 113 through which the motor shaft or the extension 221 can pass. The ring portion 120 is an annular structure and is fixedly disposed in the cavity of the base 110, specifically around the through hole 113, to prevent other components in the housing 100 from interfering with the motor shaft, so that other components in the housing 100 do not interfere with the motor shaft.

[0028] The connecting part 130 is fixedly connected to the side plate 112 of the base 110 to fix the connecting part 130 to the grounding member, such as the motor housing, so that the housing 100 can be well fixed relative to the grounding member.

[0029] The ring portion 120 is disposed around the through hole 113 to form an open cavity with the substrate 111 and the side plate 112, such that the eddy current coil plate 210, the spacer portion 300, and the conductive element 400 are accommodated within the open cavity. The eddy current coil plate 210 is disposed on one side of the substrate 111 near the base portion 110, and the conductive element 400 is disposed on the side away from the substrate 111. The spacer portion 300 is disposed between the eddy current coil plate 210 and the conductive element 400 to separate the eddy current coil plate 210 and the conductive element 400, thereby maintaining a certain distance between them.

[0030] Eddy current coil plate 210 is a type of coil plate. Eddy current coil plate 210 includes a transmitter and a receiver. The transmitter is used to emit a transmission signal, preferably towards the direction of the reflector target 220 (in...). Figure 1 The reflector (located at the bottom center) emits an eddy current magnetic field, which causes the reflector target 220 to generate a reflected signal in response to the eddy current magnetic field. The reflected signal is then received by the receiver, which performs signal processing, such as modulation and filtering. The motion information of the reflector target 220 (e.g., angular velocity, rotational speed) is then obtained based on the processed signal. Since the reflector target 220 is fixedly connected to the motor shaft, the reflector target 220 and the motor move synchronously, thus enabling the detection of the motion information of the motor shaft (e.g., rotational speed) when the motor is working.

[0031] It should be noted that after the eddy current coil plate 210 processes the signal reflected by the self-reflecting target 220, the acquisition of motion information can be achieved by an execution unit set on the eddy current coil plate 210. The execution unit can be, for example, an integrated circuit for processing signals; or it can be achieved by an external device connected to the eddy current coil plate 210, such as a host computer or a computing module. This utility model does not limit this.

[0032] Preferably, the transmitter and receiver are also electrically connected to the eddy current conductor 230 for providing electrical energy through the eddy current conductor 230 and transmitting the calculated motion information of the motor shaft to an external component, such as a host system.

[0033] Preferably, the eddy current coil board 210 is a PCBA electronic circuit board, which has a transmitting module capable of transmitting eddy current excitation signals, a receiving module capable of receiving signals, and an analysis module for analyzing motor shaft motion information.

[0034] A spacer 300 is disposed between the eddy current coil plate 210 and the conductive element 400 to isolate the eddy current coil plate 210 and the conductive element 400. Preferably, the spacer 300 is a plate-like structure with a through hole at a position corresponding to the through hole 113 of the housing 100. The edge of the spacer 300 has a flange extending towards the eddy current coil plate 210 to maximize the distance between the eddy current coil plate 210 and the conductive element 400 while minimizing the weight of the spacer 300.

[0035] Preferably, the spacing portion 300 is configured to separate the eddy current coil plate 210 from the conductive element 400 by a distance of 1mm-8mm, so as to reduce the interference of the conductive element 400 plate on the eddy current characteristics.

[0036] Preferably, the spacer 300 is made of engineering plastic, such as ABS reinforced nylon 6 / 66 PPS PEEK or other engineering plastics.

[0037] It is naturally understood that the spacer only needs to be able to separate the conductive element 400 and the eddy current coil plate 210; that is, the spacer has a shape that allows the eddy current coil plate and the conductive element to be spaced apart. This utility model does not limit its specific structure. Figure 1 In this specific embodiment, the spacer 300 is an independently provided partition, disposed between the conductive member 400 and the eddy current coil plate 210, to separate the conductive member 400 and the eddy current coil plate 210. In an alternative embodiment, the spacer 300 is a partition fixedly disposed on the housing 100, in which case the spacer 300 is integrally fixed with the housing 100, and the spacer 300 is disposed between the conductive member 400 and the eddy current coil plate 210. In yet another alternative embodiment, the spacer 300 is disposed on the housing, and can be fixed or detachable, but in this case, the spacer 300 is positioned corresponding to the conductive member 400. For example, the spacer 300 is a protrusion that can restrict the position of the conductive member 400 on the side plate 112 of the base, and the protrusion enables the conductive member 400 to be positioned at a predetermined position on the side plate 112 of the housing 100, thereby achieving the spaced separation from the eddy current coil plate 210.

[0038] In this embodiment, the conductive component 400 includes a conductive portion 410, a fixing portion 420, and a conductive connector 430. The conductive portion 410 can be in communication with a grounding component, such as the housing of a motor, and with the fixing portion 420 and the conductive connector 430 fixed thereon. The conductive portion 410 also has a matching connection hole 411 at a position corresponding to the through hole 113 of the housing 100. Multiple fixing portions 420 are fixedly disposed on the conductive portion 410 and disposed close to the connection hole 411, preferably disposed circumferentially around the connection hole 411 at equal intervals. Multiple conductive connectors 430 correspond one-to-one with multiple fixing portions 420, so that the conductive connectors 430 can be fixed inside the fixing portions 420 and disposed radially along the connection hole 411, that is, the conductive connectors 430 are fixed to the conductive portion 410 by the fixing portions 420. One end of the conductive connector 430 is disposed on the conductive part 410, and the other end is disposed in the connection hole 411, so that part of the conductive connector 430 is exposed in the connection hole 411, thereby making contact with the motor shaft and conducting electricity, outputting the shaft voltage of the motor shaft to the grounding component, thereby protecting the bearing and delaying the damage of electro-corrosion by conducting voltage reduction, and thus extending the service life of the bearing.

[0039] Preferably, the height of the ring portion 120 is the same as the height of the eddy current coil plate 210, the spacer portion 300 and the conductive member 400. The ring portion 120 is provided with a plurality of mounting grooves 121 that match the conductive connectors 430 of the conductive member 400, so that the conductive connectors 430 can make better contact with the motor shaft.

[0040] Preferably, the reflector target 220 includes a plurality of target plates 222 fixedly connected to the extension 221 and disposed along the sidewall of the extension 221. The target plates 222 are used to reflect signals emitted from the transmitter of the eddy current coil plate 210. The extension 221 is used to fix the target plates 222 to the motor shaft so that the reflector target 220 and the motor shaft remain relatively fixed. More preferably, three target plates 222 are provided, and the three target plates 222 are equally spaced. Of course, more equally spaced target plates 222 can also be made according to the accuracy requirements.

[0041] Preferably, in order to better detect the motion information of the motor shaft, the target 222 is disposed on the side of the substrate 111 of the housing 100 away from the conductive element 400, that is, the reflective target 220 is disposed closer to the axis of the motor than the housing 100. Preferably, the target 222 is disposed at a position of 0.2mm-8mm away from the substrate 111 of the housing 100.

[0042] Preferably, to further reduce the space occupied by the motor shaft, the extension 221 extends axially along the motor shaft. The axial length of the extension 221 is set to extend axially to the position corresponding to the conductive member 400 in the housing 100, or the axial length of the extension 221 is set to extend axially to the position of the mounting groove 121 of the ring portion 120 in the housing 100, so that the conductive connector 430 of the conductive member 400 contacts the side wall of the extension 221, so that the conductive connector 430 can make electrical contact with the motor shaft through the extension 221 to release the shaft voltage. At this time, the length of the outer diameter of the extension 221 is not greater than the through hole 113 on the base plate 111 of the housing 100, so that the extension 221 can pass well through the through hole 113 to reach the position matching the conductive member 400.

[0043] Preferably, when both the target 222 and the extension 221 belong to the reflective target 220, they can be processed separately or integrally formed; details will not be elaborated further. They can primarily be made of iron and steel, or copper and aluminum, and then manufactured through stamping or casting processes.

[0044] Epoxy adhesive 500 is disposed within the opening to encapsulate the housing 100 and the eddy current coil plate 210, the spacer 300, and the conductive element 400 into a single unit. Specifically, the epoxy adhesive 500 secures the eddy current coil plate 210, the spacer 300, and the conductive element 400 within the housing 100. After the eddy current coil plate 210, the spacer 300, and the conductive element 400 are sequentially placed within the opening of the housing 100, liquid epoxy adhesive 500 is poured into the housing 100. Once the liquid epoxy adhesive 500 cools and solidifies, the eddy current coil plate 210, the spacer 300, and the conductive element 400 are secured. Alternatively, besides epoxy adhesive 500, other materials such as resins can be used for encapsulation, for example, thermoplastic resins can be used to encapsulate them into a single unit; further details will not be elaborated upon.

[0045] It is understandable that the function of the ring 120 at this time is not only to prevent other components in the housing 100 from interfering with the motor shaft, but also to form an open space with a defined volume with the base 110, so as to facilitate the filling and fixing of liquid epoxy resin 500.

[0046] Therefore, the solution provided by this utility model, by setting the eddy current coil plate 210 and the conductive element 400 inside the housing 100, and by integrating the eddy current coil plate 210 and the conductive element 400, can effectively reduce the mounting position of the eddy current sensor and the conductive element 400 on the entire motor shaft. Compared with existing servo motors and frequency converter motors, the original two mounting parts are replaced with one mounting part. This saves installation space, reduces assembly steps, and optimizes the interference to the entire system after reducing the shaft voltage.

[0047] Furthermore, by integrating the eddy current coil plate 210 and the conductive element 400, the presence of the conductive element 400 enhances the EMC (electromagnetic compatibility) performance of the eddy current coil plate 210. This results in a more stable signal output and higher detection accuracy for the eddy current coil plate 210.

[0048] When installing the eddy current sensor with integrated conductive components provided by this utility model onto the motor housing, bolts are needed to thread-fix the connecting portion 130 of the housing 100 to the motor housing. However, since the housing 100 itself is relatively fragile, if it is directly fixed to the motor housing, the bolts will contact the connecting portion 130 of the housing 100 during tightening, applying a force to the connecting portion 130. This force is difficult to control. If the force applied by the threads is too small, the housing 100 will wobble relative to the motor housing, resulting in poor fixing. If the applied force is too large, the housing 100 will be damaged quickly during prolonged use. Furthermore, since the entire housing 100 is fixed together with the eddy current coil plate 210, the spacer 300, and the conductive component 400 using epoxy adhesive 500, replacement requires replacing the entire component, which is costly. Therefore, further improvements are needed.

[0049] Please see Figure 1 The connecting portion 130 of the housing 100 is a protruding part on the side plate 112 of the base 110. The connecting portion 130 and the base 110 are integrally formed to increase the rigidity of the entire structure and reduce the manufacturing process. A metal tube 131 is fixedly installed on the connecting portion 130 of the housing 100. The metal tube 131 has a through hole that can accommodate the screw shank, allowing the screw shank to pass through the metal tube 131 and be threadedly fixed to the motor housing. The screw head abuts against the metal tube 131, meaning the size of the screw head is larger than the size of the metal tube 131. The constraint between the screw head and the motor housing restricts the relative position of the housing 100.

[0050] It's understandable that the housing 100 and the motor housing could be secured not with screws, but with riveting, bonding, or other methods. The advantage of using screws is that they allow for easy detachable fixing of the housing 100 and the motor housing, and installation is relatively simple.

[0051] For the fixed connection between the metal tube 131 and the connecting portion 130 of the housing 100, in one specific embodiment, the metal tube 131 and the connecting portion 130 of the housing 100 are fixedly connected by adhesive bonding; in an alternative embodiment, the metal tube 131 and the housing 100 are integrally formed and fixed, preferably integrally formed by injection molding. The advantage of this arrangement is that the metal tube 131 can be placed at a predetermined position in the mold during the molding of the housing 100, and then the housing 100 is manufactured by injection molding. At this time, since the metal tube 131 is already placed at the predetermined position, after the injection molding process is completed, the metal tube 131 is integrally fixed to the housing 100. Compared with other fixing methods, this solution can significantly increase the firmness of the fixation between the metal tube 131 and the housing 100.

[0052] Therefore, by setting the metal tube 131, damage to the housing 100 can be effectively avoided during the process of fixing the housing 100 to the grounding component, thereby improving the service life of the entire housing 100.

[0053] Please continue reading. Figure 1 The eddy current sensor with integrated conductive elements provided by this utility model also includes a conductive grounding wire 140. The conductive grounding wire 140 is fixedly disposed on the housing 100 and is used to make electrical contact with the grounding element and the conductive part 410 of the conductive element 400 respectively, so that the conductive part 410 can be connected to the grounding element. The grounding element is preferably the housing of the motor.

[0054] Specifically, the conductive grounding wire 140 includes a fixedly connected annular segment 141 and rod segment 142, both of which are electrically conductive and are preferably made of metal. The annular segment 141 is disposed within the through hole of the connecting portion 130 for accommodating the metal tube 131 and is fixed relative to the metal tube 131, preferably disposed near the grounding element (in... Figure 1 In this embodiment, it is one side of the motor housing. The rod segment 142 extends axially along the metal tube 131 and is used for electrical contact with the conductive portion 410 of the conductive member 400. Correspondingly, a positioning structure matching the rod segment 142 is provided on the conductive portion 410 of the conductive member 400 at a position corresponding to the conductive portion 142, so that the two can achieve better electrical contact while helping the conductive member 400 achieve its positioning function, thus improving installation efficiency. Figure 1 In this specific embodiment, the positioning structure on the conductive element 400 is a hole that matches the shape of the rod segment 142.

[0055] It should be noted that the relative positional relationship between the annular segment 141 and the metal tube 131 is not limited in this invention. In one specific embodiment, the inner and outer diameters of the annular segment 141 are the same as those of the metal tube 131, thereby allowing the annular segment 141 to be positioned between the metal tube 131 and the motor housing. In another alternative embodiment, the annular segment 141 is sleeved on the outer wall of the metal tube 131, and the annular segment 141 makes electrical contact with the motor housing through the metal tube 131, thereby enabling the conductive element 400 to conduct electricity with the motor housing.

[0056] As mentioned above, the conductive component 400 and the housing 100 are preferably integrally fixed. Similarly, the conductive grounding wire 140 and the housing 100 are preferably integrally fixed, more preferably integrally formed by injection molding, so as to ensure that the conductive component 400 and the housing 100 are stably fixed while reducing the manufacturing process and improving manufacturing efficiency.

[0057] It should also be noted that the grounding wire of the conductive component 400 can be fixed to the housing 100, either on the connecting part 130 or preferably at the position corresponding to the metal tube 131. Of course, the conductive grounding wire 140 can also be fixed at other positions on the housing 100, because the conductive grounding wire 140 itself has the function of helping the conductive component 400 to be positioned through the rod end. It can also be set at a position that can better help the conductive component 400 to be positioned for easy installation, or at a position that can better achieve contact with the grounding component. The specific adjustments can be made according to different conductive components 400 and grounding components, which will not be elaborated further.

[0058] Therefore, by setting up a conductive grounding wire 140, the conductive component 400 can be made to contact the grounding component, while the rod segment 142 can help the conductive component 400 to achieve the positioning function during installation, thereby improving manufacturing efficiency.

[0059] Example 2 This embodiment is an exemplary implementation for another optimization of space usage, particularly relating to the motor axial direction ( Figure 1 Optimize space usage in the vertical direction (in the middle).

[0060] The following focuses on describing the differences between this embodiment and Embodiment 1. It is naturally understood that for the parts not described, you can refer to the corresponding description in Embodiment 1, or the existing technology in the field, or it means that it can be obtained by those skilled in the art in combination with the technology in related fields without creative effort.

[0061] Please see Figure 2Similar to Embodiment 1, the eddy current sensor integrating conductive elements also includes a housing 100, an eddy current coil plate 210, a reflective target 220, and an extension 221. The eddy current coil plate 210 is housed within the cavity formed by the ring portion 120 and the base 110 of the housing 100, and is used to send signals to the reflective target 220 and receive signals reflected from the reflective target 220 to calculate the motion information of the motor shaft.

[0062] The reflective target 220 includes multiple target plates 222. An extension 221 is fixedly sleeved on the motor shaft, and multiple target plates 222 are fixedly disposed on the side wall of the extension 221. The extension 221 is sleeved on the motor shaft at a position where there is a certain gap between the target plates 222 and the eddy current coil plate 210. The outer diameter of the extension 221 is smaller than the inner diameter of the ring 120, allowing the extension 221 to be disposed within or pass through the hole of the ring 120.

[0063] The conductive component 400 includes a conductive part 410, a fixing part (not shown in the figure), and a conductive connector 430. The conductive part 410 is used to make electrical contact with the conductive connector 430 on one side and with a grounding component on the other side. The grounding component is, for example, the motor housing, thereby realizing electrical connection between the motor shaft and the motor housing, and thus reducing electro-corrosion of the motor shaft. The method by which the conductive part 410 makes electrical contact with the grounding component, for example, can be directly connected via a wire, will not be described in detail here.

[0064] Multiple conductive fibers are fixed to form a conductive fiber bundle, namely a conductive connector 430, and are fixedly disposed on the outer wall of the extension 221 by a fixing part, so that the conductive connector 430 is fixedly disposed on the extension 221, and multiple conductive connectors 430 are arranged radially along the extension 221, thereby realizing the electrical contact between the conductive connector 430 and the motor shaft.

[0065] It should be noted that, regarding the electrical contact method between the conductive connector 430 and the motor shaft, in one specific embodiment, the extension 221 is part of the motor shaft or its extension, in which case the conductive connector 430 directly contacts the motor shaft. When the extension 221 is part of a reflective target or its extension, the conductive connector 430 can pass through the side wall of the extension 221 to reach the inner cavity of the extension 221 used to accommodate the motor shaft, and the motor shaft fitted by the extension 221 can contact the conductive connector 430 passing through the extension 221, achieving direct contact between the conductive connector 430 and the extension 221. In another alternative embodiment, the conductive connector 430 is fixedly disposed on the extension 221, and both the extension 221 and the fixed portion 420 are made of conductive material. In this case, the electrical connection between the conductive connector 430 and the motor shaft is achieved through the extension 221 and the fixed portion 420. It is understandable that the conductive connector 430 can pass through the extension 221 or not. The conductive connector 430 can be set at the position on the extension 221 where the motor shaft is sleeved, or it can be set at the position on the extension 221 where the motor shaft is not sleeved. There are no specific restrictions.

[0066] Preferably, the conductive connector 430 and the motor shaft are electrically connected through the extension 221. The advantage of this arrangement is that it can significantly reduce the difficulty and position requirements of fixing the conductive connector 430, improve manufacturing efficiency and the product's versatility for different motor models.

[0067] Please continue reading. Figure 2 The conductive part 410 is used to make electrical contact with the conductive connector 430 on one side and to make electrical connection with the grounding component on the other side. The conductive part 410 has a ring-shaped structure and is spaced apart from the eddy current coil plate 210 by a spacer 300. The conductive part 410 is disposed on the ring portion 120 of the housing 100. The inner diameter of the conductive part 410 is larger than that of the extension portion 221, so that the extension portion 221 can be fitted inside the ring of the conductive part 410. At the same time, the inner diameter of the conductive part 410 is set to be able to contact the end of the conductive connector 430 fixedly disposed on the extension portion 221, so that the conductive part 410 and the conductive connector 430 can make electrical contact, thereby realizing the electrical connection of the grounding component that is electrically connected to the conductive part 410, so as to reduce or avoid electro-corrosion of the motor shaft.

[0068] The spacer 300 is an annular component, and the inner diameter of the spacer 300 is preferably not less than the inner diameter of the annular portion 120 so as not to affect the passage of components such as the motor shaft through the annular portion 120. The spacer 300 is disposed between the eddy current coil plate 210 and the conductive element 400 to prevent the eddy current coil plate 210 and the conductive element 400 from contacting each other.

[0069] Preferably, the ring portion 120 is the spacer portion 300. In this case, the conductive portion 410 of the conductive member 400 is disposed on the ring portion 120 and is adjacent to the ring portion 120. The inner diameter of the conductive portion 410 is not less than the inner diameter of the ring portion 120, and preferably is the same as the inner diameter of the ring portion 120. The outer diameter of the conductive portion 410 is greater than the outer diameter of the ring portion 120. The eddy current coil plate 210 passes through the ring portion 120 and contacts the substrate 111 of the base portion 110. At this time, since the inner diameter of the ring portion 120 is not less than the inner diameter of the ring portion 120, the conductive portion 410 cannot contact the ring portion 120. Subsequently, the conductive portion 410, the ring portion 120, and the eddy current coil plate 210 are fixed by epoxy adhesive 500.

[0070] Therefore, the solution provided by this utility model can effectively reduce the size of the eddy current sensor with integrated conductive components in the motor axial direction.

[0071] Example 3 Figure 3 An implementation method similar to, but not the same as, Embodiment 2 is shown. The differences between this embodiment and Embodiment 2 will be described in detail below. It is understood that for any parts not described, reference can be made to the corresponding descriptions in Embodiment 1 or Embodiment 2, or to existing technologies in the field, or that such descriptions can be obtained by those skilled in the art in conjunction with relevant technologies without creative effort.

[0072] Please see Figure 3 In this embodiment, the conductive connector 430 is still fixedly mounted on the extension 221 by the fixing part 420. However, the length direction of the conductive connector 430 is not arranged radially along the extension 221 as in embodiment 2, but axially along the extension 221.

[0073] Correspondingly, although the conductive part 410 for connecting with the grounding component is still provided on the ring 120, the conductive part 410 is now a planar plate-like structure. The conductive part 410 can cover the cavity inside the ring 120, that is, the conductive part 410 can cover the ring 120. Preferably, the end of the ring 120 near the conductive part 410 is provided with a stepped structure, which can better match the conductive part 410 to achieve installation.

[0074] It should be noted that in this embodiment, the eddy current sensor integrated with a conductive element is disposed at the end of the motor shaft, and there is a certain gap between the end of the motor shaft and the conductive part 410. The extension 221 sleeved on the end of the motor shaft is disposed at a position that allows the conductive connector 430 to contact the conductive part 410. This enables the motor shaft to be connected to the grounding element through the conductive connector 430 and the conductive part 410.

[0075] It is naturally understood that in this embodiment, the ring portion 120 is the spacer portion 300, used to space the conductive element 400 and the eddy current coil plate 210. Of course, in an alternative solution, the spacer portion 300 can also be independent of the ring portion 120, with the spacer portion 300 fixed relative to the ring portion 120, thereby achieving relative separation between the conductive element 410 and the eddy current coil plate 210.

[0076] In this embodiment, by making the conductive connector 430 arranged along the axial direction of the motor shaft, and the conductive part 410 having a planar plate structure, the axial dimension of the entire eddy current sensor on the motor shaft is reduced, thereby reducing the space occupied.

[0077] Example 4 Figure 4 An embodiment similar to, but not identical to, Embodiment 3 is shown. The differences between this embodiment and Embodiment 3 will be described in detail below. It is understood that for any parts not described, reference can be made to the corresponding descriptions in Embodiment 1, Embodiment 2, or Embodiment 3, or to existing technologies in the field. This means that such descriptions can be obtained by those skilled in the art in conjunction with relevant technologies without creative effort.

[0078] Please see Figure 4 In this embodiment, the extension 221 is an annular structure with one open end, and is fixedly disposed at the end of the motor shaft. The target plate 222 of the reflective target 220 is disposed on the side of the extension 221 facing the eddy current sensor. The bottom surface of the extension 221 (the surface opposite to the open side) is a conductive plane, which allows it to be fitted onto the end of the motor shaft and configured to allow a certain gap between the target plate 222 and the eddy current sensor.

[0079] At this time, the conductive connector 430 contacts the extension 221. Simultaneously, the conductive connector 430 is fixedly disposed to the conductive portion 410 via the fixing portion 420. The conductive portion 410 is fixedly disposed at the top end of the ring portion 120, and the conductive connector 430 is fixedly disposed on the side of the conductive portion 410 facing the motor shaft, and is fixedly connected to the conductive portion 410 via the fixing portion 420. The conductive connector 430 is configured such that one end is fixedly connected to the conductive portion 410 via the fixing portion 420, and the other end can pass through the openings of the housing 100 and the extension to make electrical contact with the bottom surface of the extension 221, thereby achieving electrical connection between the conductive portion 410 and the motor shaft. It is naturally understood that, in an alternative embodiment, multiple conductive connectors may pass through the housing and directly contact the end of the motor shaft.

[0080] In this embodiment, the conductive connector 430 is fixedly mounted on the conductive part 410, with its length direction aligned with the axial direction of the motor shaft, extending out of the housing 100 and making electrical contact with the bottom surface of the extension 221. During installation, it is only necessary to fit the extension 221 onto the motor shaft, and then install the housing 100 onto the motor housing. Since the distance between the housing 100 and the reflector target 220 can be preset, the housing 100 can simply be installed onto the motor housing according to the preset distance. This ensures efficient installation and reduces installation difficulty.

[0081] Example 5 Figure 5 This embodiment illustrates a similar but different implementation to Embodiment 2. The differences between this embodiment and Embodiment 2 will be described in detail below. It is understood that for any parts not described, reference can be made to the corresponding descriptions in Embodiment 1 or Embodiment 2, or to existing technologies in the field, or that these can be obtained by those skilled in the art without creative effort by combining them with relevant technologies.

[0082] Please see Figure 5 In this example, although similar to Embodiment 2, the conductive connector 430 is fixedly mounted on the extension 221 by the fixing part 420 and the conductive connector 430 is arranged radially along the extension 221, the difference from Embodiment 2 is that in this embodiment, the conductive connector 430 is not a columnar structure, but a cuboid or cube-shaped body structure.

[0083] This results in a larger area covered by the conductive connector 430, which is composed of the same number of conductive fibers, in the circumferential direction of the motor shaft compared to Embodiment 2. The contact area with the conductive part 410 is also larger, which ensures a more stable electrical contact capability when the conductive connector 430 rotates with the rotation of the motor shaft due to the larger contact area.

[0084] It is naturally understood that in this embodiment, the conductive connector can be a conductive fiber bundle, preferably made of conductive polymer material or modified metal rod, which can better achieve the purpose of this utility model.

[0085] Example 6 Figure 6 This embodiment illustrates a similar but different implementation to Embodiment 2. The differences between this embodiment and Embodiment 2 will be described in detail below. It is understood that for any parts not described, reference can be made to the corresponding descriptions in Embodiment 1 or Embodiment 2, or to existing technologies in the field, or that these can be obtained by those skilled in the art without creative effort by combining them with relevant technologies.

[0086] Please see Figure 6 In this embodiment, the conductive part 410 is disposed on the ring portion 120 of the housing 100 and is fixed to the ring portion 120. The conductive part 410 is also a ring structure, and the conductive connector 430 is fixed to the inner wall of the conductive part 410. The conductive connector 430 is fixed to the inner wall of the conductive part 410 in a radial manner along the motor shaft, and the end of the conductive connector 430 away from the conductive part 410 is in electrical contact with the extension portion 221 or the motor shaft.

[0087] It is understood that in this embodiment, the conductive connector 430 is electrically connected to the extension 221, and its position can be flexibly adjusted according to the installation position of the extension 221. In other words, in this embodiment, the extension 221 can be provided at the end of the motor shaft or not, and the installation position is not limited. When the extension 221 is provided at the end of the motor shaft, the extension 221 can pass through the base 110 to reach the position corresponding to the conductive part 410 and make electrical contact with the conductive connector 430, thereby achieving an electrical connection between the motor shaft and the conductive part 410. When the extension 221 is not provided at the end of the motor shaft, it can either pass through the base 110 to reach the position corresponding to the conductive part 410 and make electrical contact with the conductive connector 430, thereby achieving an electrical connection between the motor shaft and the conductive part 410; or the motor shaft can pass through the reflector 220 and then through the base 110 to reach the position corresponding to the conductive part 410 and make electrical contact with the conductive connector 430, thereby achieving an electrical connection between the motor shaft and the conductive part 410.

[0088] In this embodiment, the installation positions of the reflective target 220 and the housing 100 can be adjusted in many different ways depending on the different situations of the motor shaft and the motor housing, so as to better adapt to different styles and shapes of motor shafts.

[0089] Furthermore, based on the foregoing description, it is naturally understood that the present invention can also provide a motor assembly, including a motor and the eddy current sensor with integrated conductive elements as described in the first aspect; the reflective target is fixedly sleeved on the motor shaft of the motor; the housing is sleeved on the motor shaft and detachably fixed to the outer casing of the motor; the outer casing of the motor is grounded; wherein the reflective target is disposed closer to the axis of the motor than the housing.

[0090] As can be seen from the foregoing description, the present invention may also provide a motor for detachably fixing to the eddy current sensor with integrated conductive components as described in the first aspect of the present invention. The motor has a motor shaft, and the reflective target is fixedly sleeved on the motor shaft. The housing is sleeved on the motor shaft and detachably fixed to the outer casing of the motor. The outer casing of the motor is grounded. The reflective target is positioned closer to the axis of the motor than the housing.

[0091] The present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

[0092] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0093] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0094] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

Claims

1. An eddy current sensor integrated with a conductive element, characterized in that, include: The reflector is configured as an extension capable of fixing the reflector and the motor shaft, a housing at least partially fitted onto the motor shaft, and a coil plate, a spacer and a conductive element sequentially fixed inside the housing; The conductive component includes a conductive part fixed relative to the housing and electrically connected to the grounding component, an electrical connection extension, and a conductive connector of the conductive part, wherein the conductive connector is fixed relative to the conductive part or the extension. The coil plate is used to emit signals and process signals received from the reflective target to obtain motion information of the motor shaft; The spacer portion has a shape that spacees the conductive portions of the coil plate and the conductive element apart.

2. The eddy current sensor with integrated conductive elements according to claim 1, characterized in that, The conductive connector is fixed on the conductive part and makes electrical contact with the extension part. The conductive connector is arranged radially along the motor shaft. The conductive part is a plate-shaped structure with a connection hole that is fixed relative to the housing, and the connection hole is configured to accommodate the extension part; Alternatively, the conductive part may be a ring-shaped structure fixed relative to the housing, with multiple conductive connectors fixedly disposed on the inner wall of the conductive part.

3. The eddy current sensor with integrated conductive elements according to claim 1, characterized in that, The conductive connector is fixed to the conductive part, and the conductive connector is arranged along the axial direction of the motor shaft. The conductive part is fixed relative to the housing. Multiple conductive connectors pass through the housing to make electrical contact with the extension disposed at the end of the motor shaft.

4. The eddy current sensor with integrated conductive elements according to claim 1, characterized in that, Multiple conductive connectors are fixedly disposed on the outer wall of the extension and arranged radially along the motor shaft; wherein The conductive part is a ring-shaped structure fixed relative to the housing, and the conductive part is configured to make electrical contact with the conductive connector.

5. The eddy current sensor with integrated conductive element according to claim 1, characterized in that, The conductive connector is fixed to the extension, and the conductive connector is arranged along the axial direction of the motor shaft, wherein... The extension is disposed at the end of the motor shaft; The conductive part is a plate-shaped structure fixed relative to the housing. The conductive connector is disposed on the side of the extension facing the conductive portion and is capable of making electrical contact with the conductive portion.

6. The eddy current sensor with integrated conductive element according to any one of claims 1-5, characterized in that, The extension is part of the motor shaft, or part of the reflective target, or is set independently relative to the reflective target and the motor shaft; And / or, the conductive connector is a structure of flexible or elastic contact made of conductive fiber bundles or conductive polymer materials or modified metal rods.

7. The eddy current sensor with integrated conductive element according to any one of claims 1-5, characterized in that, The housing includes a fixedly disposed base and a ring portion; The base includes a substrate and a side plate fixed along the edge of the substrate. The substrate has a through hole through which a motor shaft or extension can pass. The annular portion is disposed around the through hole to form an open cavity with the substrate and the side plate. The coil plate and conductive components are housed within the open cavity and are fixedly connected to the housing. Optionally, the spacer is a partition plate disposed between the conductive element and the eddy current sensor, and the partition plate is independent of the housing; Alternatively, the spacer portion may be provided on the housing so that the coil plate and the conductive element are spaced apart; Alternatively, the ring portion may be the spacer portion.

8. The eddy current sensor with integrated conductive element according to claim 7, characterized in that, It also includes epoxy resin, which is disposed within the opening cavity to at least encapsulate the housing, the coil plate, and the conductive element into a single unit; And / or, the base is sleeved on the motor shaft and fixedly connected to the grounding component, the grounding component being the outer casing of the motor; the casing further includes a connecting part, the connecting part being fixedly disposed on the side plate of the base and detachably connected to the outer casing of the motor; wherein a metal tube with a through hole is fixedly disposed on the connecting part, and the casing is detachably connected to the outer casing of the motor through the through hole of the metal tube.

9. A motor assembly, characterized in that, Includes a motor and an eddy current sensor with integrated conductive elements as described in any one of claims 1-8; The reflective target is fixedly sleeved on the motor shaft of the motor; the housing is sleeved on the motor shaft and detachably fixed to the outer casing of the motor; the outer casing of the motor is grounded; wherein... The reflective target is positioned closer to the axis of the motor than the housing.

10. An electric motor, characterized in that, For detachable fixing to the eddy current sensor with integrated conductive elements as described in any one of claims 1-8, the motor has a motor shaft, the reflective target is fixedly sleeved on the motor shaft through an extension; the housing is sleeved on the motor shaft and detachably fixed to the motor housing; the motor housing is grounded.

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