Electrocorrosion protection device for motor bearing, and motor comprising same

Abstract

Disclosed in the present invention are an electrocorrosion protection device for a motor bearing, and a motor comprising same. The electrocorrosion protection device comprises: an annular or sector annular PCB substrate, the PCB substrate being divided into a radially inner edge region, a radially outer edge region and a middle region therebetween; a plurality of tubular conductive components in which conductive fiber bundles are fixed; a plurality of substrate conductive contacts, which are located in the radially outer edge region and configured to be electrically connectable to a housing or a grounding terminal of a motor; a substrate conduction circuit provided on the surface of a first body, the substrate conduction circuit allowing the voltage at an exposed end of each conductive fiber bundle to be released to the housing or grounding terminal of the motor via the substrate conduction circuit and the substrate conductive contacts; and a specific functional component, provided in the middle region or provided in a gap region between the tubular conductive components in the radially inner edge region. The present invention helps to achieve a balance between the miniaturization design of servo motors, and various requirements in terms of operation monitoring and bearing protection for servo motors, etc.

Description

Electrical erosion protection device for motor bearing and motor comprising same TECHNICAL FIELD

[0001] The present disclosure relates to the field of electric machines, and in particular to an electrical erosion protection device for motor bearing and motor comprising same. BACKGROUND

[0002] Currently, during the use of electric machines, bearing protection devices are used to protect the electric machines to solve the problem of electrical erosion of the bearings of variable frequency electric machines. The bearing protection device can effectively control the shaft voltage and bearing current, and protect the bearing. In particular, when the servo motor or variable frequency motor is working, the shaft voltage generated by the capacitive effect, electromagnetic effect and static electricity effect of rotation friction on the shaft may damage the bearing by punching through the bearing. Therefore, a lower resistance conductive path is formed by using the bearing protection device, so that the shaft voltage in the electric machine can release voltage through the path, thereby effectively protecting the bearing in the electric machine. Among them, an existing method mainly uses a conductive fiber to soft connect the shaft and the grounding part of the machine shell, so that the voltage formed on the shaft is released on the path where the conductive fiber is located to reduce the voltage difference between the shaft and the ground.

[0003] However, most of the existing designs of bearing protection devices mainly use the method of installing conductive fibers and then pressing the body to deform the pressing part to fix the conductive fibers, so that the body deforms slightly during pressing, affecting the precision of the product shape, often leading to a decrease in service life during later use, and even causing wear and other adverse effects in multiple shafts. At the same time, the existing bearing protection device manufacturing process is complex, and the production, use and installation procedures are relatively cumbersome, resulting in an increase in cost.

[0004] In order to eliminate the above defects of the designs of most existing bearing protection devices, enterprises and engineers in the field and related technical fields have proposed many improved solutions, but most of the solutions still cannot achieve a satisfactory degree in terms of product precision control and complexity of batch production and processing procedures, especially the design of the bearing protection device often requires high precision and high complexity of the processing procedure, which will result in high cost in batch production.

[0005] Among these improved solutions, the technical progress achieved by Chinese patent applications CN 114448178 A and CN 118199337 A is more obvious, especially the improved solution of the latter largely realizes the separation of production links, which helps to improve production efficiency and reduce production cost. At the same time, the processes involved in the production and assembly process of the bearing protection device are more suitable for automated production and reduce or even avoid the dependence on high-precision machining links.

[0006] However, the above-mentioned existing improved solutions for bearing protection device still have the following defects or shortcomings.

[0007] Since the servo motor is widely used in various fields, its performance and precision directly affect the operation efficiency and quality of the equipment driven by it. Therefore, in some fields, it is necessary to monitor or detect the parameters directly related to the working state of the servo motor, such as the speed, direction and angle of the motor, and in other fields, it is necessary to monitor or detect the parameters indirectly related to the working state of the servo motor, such as the temperature of the environment. Therefore, in some fields, the servo motor not only needs to set the existing bearing protection device as above for effective control of shaft voltage and bearing current, but also needs to set a detection device or a sensor device associated with the motor rotor for the above-mentioned monitoring purpose. In order for these devices and components to work without interfering with each other, it is inevitable to occupy a larger space inside the motor housing, especially near the shaft end side, and therefore it is necessary to leave enough space inside the housing in the axial direction at the shaft end side to meet the above-mentioned needs. This to some extent causes the difficulty in balancing the operation monitoring, bearing protection and miniaturization design of the servo motor.

[0008] Therefore, it is urgent to provide a new solution to at least partially alleviate or solve the above-mentioned problems and defects existing in the prior art. SUMMARY

[0009] One purpose of the present disclosure is to at least partially alleviate or eliminate the above-mentioned defects existing in the motor bearing protection device in the prior art, and to provide a new electric corrosion protection device for motor bearing and a motor comprising the same.

[0010] The present disclosure provides an electric corrosion protection device for motor bearing, characterized in that the electric corrosion protection device comprises:

[0011] A PCB substrate in the shape of a ring or a sector ring, the PCB substrate is divided into a radial first side edge region, a radial second side edge region and an intermediate region between the two, a plurality of welding fixing discs are arranged in the radial first side edge region of the first main surface of the PCB substrate in the circumferential direction;

[0012] A plurality of conductive components, each conductive component is fixedly connected to a welding fixing disc by welding;

[0013] A plurality of substrate conductive contacts, the substrate conductive contacts are located in the radial second side edge region and are configured to be electrically connected to the motor housing or the ground end of the motor;

[0014] a substrate conductive circuit provided on the first body surface, the substrate conductive circuit electrically connecting the conductive assembly and the substrate conductive contact, thereby allowing a voltage to be discharged to a housing or a ground terminal of the motor via the conductive assembly, the substrate conductive circuit and the substrate conductive contact;

[0015] at least one specific functional component configured for a specific function other than voltage discharge and arranged in the intermediate region or in a gap region between the conductive assemblies in the radial first side edge region.

[0016] In general, the technical solution proposed by the present disclosure is based on the following basic technical insight, i.e. the way of loading multiple conductive assemblies with a partially annular PCB board can construct an innovative basic structure of an electro-erosion protection device for motor bearings in the form of a conductive ring. For motors, especially servo motors, the length or axial direction along the motor shaft is often crucial for the miniaturization of the motor and the space it occupies in the relevant electric drive device, and for the electro-erosion protection device, in order to conduct the shaft voltage and bearing current from the bearing to the motor ground terminal (such as the motor housing) to achieve protection for the bearing, the electrically conductive structure or design from the shaft near the bearing to the ground terminal is actually essential.

[0017] This means that in order to set up an effective electro-erosion protection, at a certain axial position on the motor shaft near the motor bearing, an electrically conductive structure is needed to guide the current radially outward from the shaft to the ground terminal usually located at the radial outside of the motor. Due to the structural characteristics of many motors, there is a certain radial space or radial distance between the shaft and the ground terminal, so the present disclosure uses a PCB board as the carrier body of the above-mentioned electrically conductive structure to provide a space suitable for additional arrangement of specific functional components for the motor (and some functions related to the motor) at the space already basically occupied by the electrically conductive structure, which means that the specific functional components for the motor provided / configured in various embodiments of the present disclosure will be able to be arranged in the electro-erosion protection device in a very space-saving manner, even almost without occupying additional space (especially along the length of the shaft or in the axial direction). The above-mentioned advantages and further advantages of the present disclosure can be more obviously seen from the various embodiments and illustrated examples described below.

[0018] According to an embodiment of the present disclosure, the conductive assembly is a tubular conductive assembly, each of which has a conductive fiber bundle fixed therein, and each of which is fixedly connected to a welding fixing disc by welding, one end of the conductive fiber bundle being exposed to the tubular conductive assembly in the direction of the motor shaft on the radial inner side or the radial outer side, so as to allow the voltage at the exposed end of the conductive fiber bundle to be released to the motor casing or the grounding end of the motor via the substrate conduction circuit and the substrate conductive contact. For example, one end of the conductive fiber bundle is exposed in the direction of the motor shaft on the radial inner side to make soft contact with the motor shaft, and thus the voltage at the exposed end of the conductive fiber bundle is released to the motor casing or the grounding end (on the radial outer side) of the motor via the substrate conduction circuit and the substrate conductive contact.

[0019] According to a preferred embodiment of the present disclosure, the radial first side edge is a radial inner edge, and the radial second side edge is a radial outer edge.

[0020] According to an embodiment of the present disclosure, the specific functional component includes a filter circuit arranged on the first main surface, the filter circuit being formed as part of the substrate conduction circuit and being configured to conduct and / or neutralize alternating current of a predetermined frequency.

[0021] According to an embodiment of the present disclosure, according to the filter circuit having a medium frequency filter circuit and a high frequency filter circuit, the medium frequency filter circuit is configured to conduct and neutralize electric charges in a frequency range of 0-40 KHZ, and the high frequency filter circuit is configured to conduct and neutralize electric charges in a frequency range of 40 KHZ-200 MHZ.

[0022] According to an embodiment of the present disclosure, the specific functional component includes an inductive encoder assembly having an inductive eddy current coil and an eddy current analysis IC, wherein the inductive eddy current coil and the eddy current analysis IC are arranged in the intermediate region.

[0023] According to an embodiment of the present disclosure, the inductive eddy current coil and the eddy current analysis IC are arranged on the second main surface of the PCB substrate, wherein the second main surface and the first main surface are opposite.

[0024] According to an embodiment of the present disclosure, the specific functional component includes a Hall encoder having a plurality of Hall sensors and a Hall effect analysis IC, wherein the plurality of Hall sensors are distributed equidistantly in the circumferential direction.

[0025] According to an embodiment of the present disclosure, the specific functional component includes an eddy current distance sensor having an eddy current transmitting device and an eddy current receiving device, wherein the eddy current transmitting device and the eddy current receiving device are arranged at or close to the first radial side edge end of the PCB substrate, or arranged close to the shaft of the motor.

[0026] According to an embodiment of the present disclosure, the plurality of conductive components are arranged to have a plurality of narrow gaps and a plurality of wide gaps between each other in the circumferential direction, such that the conductive components other than those located at both sides of the plurality of wide gaps are closely arranged in the circumferential direction, wherein the plurality of Hall sensors and / or the eddy current distance sensor are arranged in the plurality of wide gaps, close to the first radial side edge end of the PCB substrate.

[0027] According to an embodiment of the present disclosure, the specific functional component includes a sound pickup (e.g. a digital microphone sensor), a temperature sensor and / or a humidity sensor, which are arranged in the middle area of the first main surface; and / or

[0028] The specific functional component includes a gas or chemical sensor configured to be capable of detecting a predetermined type of volatile matter.

[0029] According to an embodiment of the present disclosure, the specific functional component includes a communication module electrically connected to all sensors to receive their sensing signals, and used for transmitting the sensing signals to a monitoring terminal.

[0030] According to some preferred embodiments of the present disclosure, a plurality of the aforementioned functional components / circuits and communication modules can be simultaneously integrated / arranged on the PCB substrate, the plurality of specific functional components integrated with each other can be insulated from each other, and the sensing component part and the associated analysis IC can be insulated from each other in addition to the signal transmission path, and a plurality of analysis ICs can be integrated into a single analysis IC as appropriate.

[0031] According to an embodiment of the present disclosure, the electro-erosion protection device further includes:

[0032] A wire interface component is arranged in the middle area and connected with a signal transmission line or a power supply line for the specific functional component.

[0033] According to an embodiment of the present disclosure, the electro-erosion protection device further includes:

[0034] a plurality of sets of electrically conductive contact assemblies, each set of electrically conductive contact assemblies comprising a fastening hole and an electrically conductive sheet of metal arranged at least partially around the fastening hole, thereby constituting a substrate electrically conductive contact.

[0035] The present disclosure also relates to an electric machine comprising the electric corrosion protection device of any of the above embodiments, wherein the PCB substrate is fixedly connected to a housing of the electric machine, and the electrically conductive assembly directly or indirectly contacts a shaft of the electric machine thereby electrically conductively connecting therewith.

[0036] According to an embodiment of the present disclosure, the electric machine further comprises a reflective target plate fixedly connected to the shaft of the electric machine and facing the inductive eddy current coil, and a plurality of metal target sheets arranged in a circumferential direction, and the reflective target plate optionally can have an intermediate fixing hole for fixedly connecting the shaft.

[0037] According to an embodiment of the present disclosure, the electric machine further comprises an inductive magnet or a magnetic shaft installed at the shaft end side thereof, and the plurality of Hall sensors are arranged at a main body surface of the PCB substrate facing the shaft end side.

[0038] On the basis of common general knowledge in the art, the above-mentioned preferred conditions can be combined arbitrarily, thereby obtaining various preferred examples of the present disclosure.

[0039] The positive progress effect of the present disclosure is that:

[0040] The electric corrosion protection device for electric machine bearings and the electric machine according to the present disclosure help to meet the needs of miniaturization design of electric machines (especially servo motors), operation monitoring of servo motors, bearing protection, and other aspects. BRIEF DESCRIPTION OF DRAWINGS

[0041] FIG. 1 shows a side perspective view of an exemplary electric machine in which an electric corrosion protection device for electric machine bearings according to a preferred embodiment of the present disclosure is properly installed or fitted.

[0042] FIG. 2A schematically shows a front view (i.e., viewed from a first main body surface of the electric corrosion protection device) of the electric corrosion protection device for electric machine bearings of the first embodiment.

[0043] FIG. 2B schematically shows a back view (i.e., viewed from a second main body surface of the electric corrosion protection device) of the electric corrosion protection device of the first embodiment.

[0044] FIG. 3A schematically shows a front view of the electric corrosion protection device for electric machine bearings of the second embodiment.

[0045] FIG. 3B schematically shows a back view of the electric corrosion protection device of the second embodiment.

[0046] Fig. 3C schematically shows a side perspective view of an electric machine having installed therein the electric corrosion protection device of the second embodiment and a reflecting target plate.

[0047] Fig. 3D schematically shows the reflecting target plate of Fig. 3C.

[0048] Fig. 4A schematically shows a front view of an electric corrosion protection device for an electric machine bearing of a third embodiment.

[0049] Fig. 4B schematically shows a back view of the electric corrosion protection device of the third embodiment.

[0050] Fig. 4C schematically shows a side perspective view of an electric machine having installed therein the electric corrosion protection device of the third embodiment and a magnet, which is installed at the shaft end side thereof.

[0051] Fig. 5A schematically shows a front view of an electric corrosion protection device for an electric machine bearing of a fourth embodiment.

[0052] Fig. 5B schematically shows a back view of the electric corrosion protection device of the fourth embodiment.

[0053] Fig. 5C schematically shows an axial perspective view of an electric machine having installed therein the electric corrosion protection device of the fourth embodiment.

[0054] Fig. 5D schematically shows an exemplary structure of an eddy current distance sensor having an eddy current transmitting device and an eddy current receiving device in Fig. 5C.

[0055] Fig. 6 schematically shows a front view of an electric corrosion protection device for an electric machine bearing of a fifth embodiment.

[0056] Fig. 7 schematically shows a front view of an electric corrosion protection device for an electric machine bearing of a sixth embodiment.

[0057] Fig. 8A schematically shows a front view of an electric corrosion protection device for an electric machine bearing of a seventh embodiment.

[0058] Fig. 8B schematically shows a partial cutaway view of a state of installation of the electric corrosion protection device of the seventh embodiment in an electric machine.

[0059] Fig. 8C schematically shows an axial perspective view of an electric machine having installed therein the electric corrosion protection device of the seventh embodiment.

[0060] Reference numerals: 100: motor 101: bearing 102: shaft 103: shaft end side 104: housing 105: stator coil 1: electro-erosion protection device 2: PCB substrate 21: fastening hole 22: conductive metal sheet 23: tubular conductive assembly 231: conductive fiber bundle 24: radially inner edge region 25: radially outer edge region 26: intermediate region 3: filter circuit 41: inductive eddy current coil 42: eddy current resolver IC 43: reflective target plate 431: intermediate fixation hole 432: metal target sheet 51: Hall sensor 52: Hall effect resolver IC 53: inductive magnet 6: eddy current distance sensor 61: eddy current transmitting device 62: eddy current receiving device 63: distance sensor housing 64: distance sensor external wiring point 71: pickup 72: temperature sensor 73: gas or chemical substance sensor 81: terminal post 82: signal transmission line or power supply line DETAILED DESCRIPTION

[0061] The preferred embodiments of the present application will be further described in detail with reference to the accompanying drawings. The following description is exemplary only and is not intended to limit the present application, and any other similar cases also fall within the scope of the present application.

[0062] In the following detailed description, directional terms such as "left", "right", "upper", "lower", "front", "back", etc. are used with reference to the orientation of the figures described. The components of the embodiments of the present application can be placed in various different orientations, and the directional terms are used for the purpose of example and are not limiting.

[0063] From the above description and the following more detailed exemplary description of the electro-erosion protection device for motor bearings according to the preferred embodiments of the present disclosure, those skilled in the art will be able to understand that the preferred embodiments (examples) in the present disclosure not only provide an electro-erosion protection device with reliable bearing protection performance and low production and processing cost (all required processing procedures can be mass-produced at a relatively low cost and the processing equipment has low complexity), but also greatly outperform the related prior art solutions in terms of functional integration and space utilization efficiency (space occupation is saved or reduced).

[0064] Fig. 1 shows an exemplary electric machine 100 in which an electric erosion protection device 1 for the bearing 101 of the electric machine 100 according to the first embodiment of the present disclosure is properly installed or assembled. It is to be noted that in the following description of various embodiments, Fig. 1 shows some common aspects and features of various embodiments and the technical advantages resulting therefrom, such as the technical advantages in terms of functional integration and space utilization efficiency, except for the differences in configuration and installation caused by the unique features of various specific exemplary functional components, in terms of the assembly relationship, assembly position, etc. of the electric erosion protection device 1, especially the PCB substrate 2 as the load-bearing main body, assembled into the electric machine 100.

[0065] In addition, it should be understood that the specific devices and components shown in the following specific embodiments and their drawings are for the purpose of facilitating the understanding of various embodiments of the present disclosure, and these specific examples are not intended to limit the protection scope of the present disclosure, and due to the limited space, the following specific embodiments are exemplified by taking the basic design of the plurality of welding fixing discs and the plurality of tubular conductive assemblies 23 arranged circumferentially in the radial inner edge area 24 of the PCB substrate 2 as an example, but it is also feasible to arrange the plurality of welding fixing discs and the plurality of tubular conductive assemblies 23 circumferentially in the radial outer edge area 25 of the PCB substrate 2 as another way.

[0066] And as will be seen from the following description, the following embodiments can be combined as needed to create other embodiments in addition to the embodiments shown in the following description and drawings, and it can be understood that such created other embodiments can achieve further improvements in the above technical advantages.

[0067] First Embodiment

[0068] Referring to Figs. 1 and 2A-2B, the electric erosion protection device 1 for the bearing 101 of the electric machine 100 according to the first embodiment of the present disclosure comprises:

[0069] a PCB substrate 2 in the form of a ring or a sector ring (not shown in the drawings, but can be understood as a sector ring part of the illustrated substrate), the PCB substrate 2 is divided into a radial inner edge area 24, a radial outer edge area 25, and an intermediate area 26 between the two, and a plurality of welding fixing discs are arranged circumferentially in the radial inner edge area 24 of the first main surface of the PCB substrate 2;

[0070] a plurality of tubular conductive assemblies 23, each of which has a conductive fiber bundle 231 fixed therein and is fixedly connected to one of the welding fixing discs by welding, so that one end of the conductive fiber bundle 231 is exposed to the radial inner side of the tubular conductive assembly 23;

[0071] a plurality of substrate conductive contacts located in the radially outer region 25 and configured to be electrically connected to a housing or ground terminal of the motor 100;

[0072] a substrate conductive circuit provided on the first body surface and electrically connecting the tubular conductive assembly 23 and the substrate conductive contacts, thereby allowing the voltage at the exposed end of the conductive fiber bundle 231 to be discharged to the housing or ground terminal of the motor 100 via the substrate conductive circuit and the substrate conductive contacts;

[0073] a specific functional component, which is a filter circuit 3 provided on the first body surface, the filter circuit 3 being formed as part of the substrate conductive circuit (not shown in the figure) and configured to conduct and / or neutralize alternating current of a predetermined frequency.

[0074] In this regard, as shown in FIG. 2A, the basic arrangement of the filter circuit 3 is in the intermediate region 26, or at least a large part of the filter circuit 3 is optionally arranged in the intermediate region 26. In this regard, the filter circuit 3 shown in FIG. 2A has two parts of circuit, a medium frequency filter circuit 3 configured to conduct and neutralize electric charge in the frequency range of 0-40 KHZ, and a high frequency filter circuit 3 configured to conduct and neutralize electric charge in the frequency range of 40 KHZ-200 MHZ.

[0075] In this regard, further referring to FIG. 2A, the tubular conductive assembly 23, which can be mass-produced in a modular form, can be fixedly connected to a welding fixing disc on the first body surface by welding, although the welding fixing disc is not shown in the figure, but it can be understood that the welding fixing disc is located approximately near the inner edge of the PCB substrate 2, and the tubular conductive assembly 23 is welded to the area near the inner edge of the front of the PCB substrate 2. Referring to FIG. 2B, a series of clamping grooves can also be provided near the inner edge of the PCB substrate 2, and the tail part (opposite to the exposed end of the conductive fiber bundle 231) of the tubular conductive assembly 23 can be provided with a tail part protrusion corresponding to the clamping groove, which can be conveniently clamped into the clamping groove to complete positioning and play a certain reinforcing role.

[0076] It should be understood that the tubular conductive assembly 23 installed on the welding fixing disc of the first body surface has a certain thickness due to the internal accommodation of the conductive fiber bundle 231, and the thickness is consistent with the axial direction towards the bearing 101 or away from the motor shaft end side 103 of the motor 100 in the installed state shown in FIG. 1. One advantage of the filter circuit 3 arranged in the above manner is that the radial space of the motor shaft 100 is fully utilized, and the circuit elements of the filter circuit 3 such as required capacitance, resistance and inductance basically do not have any adverse effects on the space utilization efficiency or miniaturization requirements of the motor 100 as long as they are within a size range similar to the thickness of the tubular conductive assembly 23.

[0077] Further with reference to Figs. 2A and 2B, according to a preferred configuration, the electro-erosion protection device 1 further comprises a number of sets of electrically conductive contact assemblies, each set of electrically conductive contact assemblies comprising a fastening hole 21 and an electrically conductive metal sheet 22 arranged at least partially around the fastening hole 21, thereby constituting a base plate electrically conductive contact. The fastening hole 21 can for example be a threaded hole or a rivet hole, and such design can utilize fastening means such as screws, rivets, etc. to secure the outer rim of the PCB base plate 2 to the housing 104 of the electric motor 100 (grounding terminal) via the fastening hole 21 and in reliable contact or abutment with each other, with the electrically conductive fiber bundle 231 exposed at the end towards the radially inner side in contact with the shaft 102 of the electric motor 100. The metal fastening means serves both to secure the connection and to conduct electricity at the same time, while the metal sheet also serves the advantageous function of strengthening the structural strength at the connection location and improving the reliability of long-term use. Among them, the PCB base plate 2 is fixedly connected to the housing 104 of the electric motor 100,

[0078] Another advantageous aspect of this preferred embodiment with reference to Figs. 2A-2B is that the filter circuit 3 is arranged on the side where the electrically conductive assemblies are mounted, which facilitates better production and installation, and in addition, when other functional components are integrated, more space can be reserved for other components, thereby helping to further improve the functional integration of the electro-erosion protection device 1.

[0079] It can be understood that the assembly and basic design of the electro-erosion protection device 1 and its PCB base plate 2 and the specific configuration of the number of sets of electrically conductive contact assemblies arranged therein are basically the same as in the other embodiments described below, and therefore will not be described again in the following. However, one notable difference between the first embodiment and the other embodiments described below is that the following embodiments all integrate a certain sensor function related to the detection or monitoring of the operation of the electric motor 100.

[0080] Second embodiment

[0081] The electro-erosion protection device 1 according to the second embodiment of the present disclosure differs from the first embodiment only in the following aspects.

[0082] With reference to Figs. 3A-3D, the specific functional component in this embodiment is an inductive encoder assembly having an inductive eddy current coil 41 and an eddy current analysis IC 42 (integrated circuit, such as an integrated digital circuit), wherein the inductive eddy current coil 41 and the eddy current analysis IC 42 are arranged in the intermediate region 26. And further preferably, the inductive eddy current coil 41 and the eddy current analysis IC 42 are arranged on the second main surface of the PCB base plate 2, wherein the second main surface is opposite to the first main surface.

[0083] Referring to FIG. 3C, the inductive encoder assembly in the present embodiment is used in cooperation with a reflective target plate 43 arranged at the shaft end side 103 of the motor 100, the reflective target plate 43 having a middle fixing hole 431 and a plurality of metal target plates 432 arranged along the circumferential direction, the reflective target plate 43 being fixedly connected to the shaft 102 of the motor 100 via the middle fixing hole 431 and facing the inductive eddy current coil 41.

[0084] The target plate rotates together with the rotor of the motor 100, and reflects the magnetic field to the inductive eddy current coil 41 according to its position,

[0085] The inductive encoder assembly in the present embodiment works in the following way, i.e. the inductive eddy current coil 41 receives the electromagnetic field reflected by the target plate, and generates a set of three alternating current signals, and transmits the signals to the eddy current resolver IC 42, by collecting the alternating current electromagnetic signals and resolving by the eddy current resolver IC 42, so as to derive parameters such as the working state parameters of the servo motor 100 or variable frequency motor 100, e.g. the instantaneous rotating speed, rotating direction, rotating angle, etc. of the motor 100, based on the alternating current electromagnetic signals and their changes, thereby the integrated solution can provide real-time monitoring of the working state of the motor 100.

[0086] Further referring to FIGS. 3A-3C, the electro-erosion protection device 1 further comprises a wire interface component in the form of, for example, a terminal 81 or a row of terminal slots or terminal ports, which is arranged at the middle region 26 and is connected with signal transmission lines or power supply lines 82 for specific functional components. This is particularly advantageous in the case where the electro-erosion protection device 1 is integrated with multiple sensors or sensing devices, for example in the case where the electro-erosion protection device 1 is integrated with different sensor devices in the present embodiment and in some of the following embodiments, the wire interface component can provide a layout of power supply lines 82 and signal transmission lines that do not interfere with each other and are in order.

[0087] In addition, the specific functional components can further comprise, for example, a communication module, which is electrically connected to all the sensors to receive their sensing signals, and is used to send the sensing signals to a monitoring terminal.

[0088] It can be understood that the wire interface component and the communication module described above can be applied to other embodiments described below.

[0089] Third Embodiment

[0090] The electro-erosion protection device 1 according to the third embodiment of the present disclosure is mainly different from the second embodiment only in the following aspects.

[0091] Referring to FIG. 4A-4C, the specific functional components in this embodiment are a Hall encoder comprising a plurality of Hall sensors 51 and a Hall effect analysis IC 52, wherein the plurality of Hall sensors 51 are distributed equidistantly along the circumference. Preferably, the plurality of tubular conductive components 23 are arranged to leave several narrow gaps and three uniform wide gaps between each other along the circumference, so that the tubular conductive components 23 are closely arranged along the circumference except for the positions at the two sides of the wide gaps, and the plurality of Hall sensors 51 are arranged in the three wide gaps, close to the radially inner edge of the PCB substrate 2. This utilizes the feature that the Hall sensors 51 and the tubular conductive components 23 do not affect each other in work and function, and provides an integrated solution with better space utilization.

[0092] Referring to FIG. 4C, the Hall encoder in this embodiment is used in cooperation with the inductive magnet 53 or the magnetic shaft installed at the shaft end side 103, and the plurality of Hall sensors 51 are arranged on the main surface of the PCB substrate 2 facing the shaft end side 103.

[0093] The Hall encoder assembly in this embodiment works in the following way: the magnetic shaft or the inductive magnet 53 at the shaft end of the motor 100 rotates together with the rotor, the magnetic signal of the magnetic shaft or the magnet is received by the Hall sensor 51, converted into an electric signal and transmitted to the analysis IC, and the electric signal generated by the Hall effect analysis IC 52 in response to the magnetic field intensity on the shaft is analyzed, thereby achieving the purpose of monitoring the working state of the servo motor 100 or the variable frequency motor 100, and also realizing real-time monitoring of the parameters such as the rotation speed, rotation direction, and rotation angle of the motor 100. An additional advantage of this embodiment is that the cost is lower than that of the second embodiment, and similar functions are achieved.

[0094] Fourth Embodiment

[0095] The main difference between the electro-erosion protection device 1 according to the fourth embodiment of the present disclosure and the first embodiment is only in the following aspects.

[0096] Referring to FIG. 5A-5D, the specific functional components in this embodiment are an eddy current distance sensor 6 comprising an eddy current transmitting device 61 and an eddy current receiving device 62, wherein the eddy current transmitting device 61 and the eddy current receiving device 62 are arranged at or close to the radially inner edge of the PCB substrate 2, or arranged close to the shaft 102 of the motor 100.

[0097] The electric corrosion protection device 1 of the present embodiment is equivalent to a device integrating the use of the eddy current effect to measure the distance between the object and the sensor probe, which works in the following way, that is, the eddy current transmission device 61 in the eddy current distance sensor 6 mainly transmits the eddy current magnetic field towards the radial inward direction (towards the shaft surface of the motor shaft 102), and the shaft surface generates a reflected signal in response to the eddy current magnetic field so that the eddy current receiving device 62 receives the reflected signal, and then according to the waveform difference between the transmitted signal and the received reflected signal, the runout size when the motor shaft 102 (shaft surface) moves can be more accurately calculated, that is, the detection of the shaft runout amplitude of the main shaft when the motor 100 is working is realized.

[0098] Further application on this basis can include that by detecting the main shaft runout after the motor 100 is running for a long time and the ratio of the main shaft runout under load and no load, the problems that may exist in the servo motor 100 can be found more timely, so as to early warning or find the operation risk or defect of the motor 100.

[0099] And further preferably, especially with reference to Figs. 5A and 5C, the plurality of tubular conductive components 23 are arranged to leave several narrow gaps and a wide gap between each other in the circumferential direction, so that the tubular conductive components 23 except those located on both sides of the several wide gaps are closely arranged in the circumferential direction, and the eddy current distance sensor 6 is arranged in the wide gap, so that the eddy current distance sensor 6 can be arranged as close as possible to the radial inner edge end of the PCB substrate 2. This not only achieves a more optimal effect in the space utilization efficiency of the integrated scheme, but also helps to more accurately measure the shaft surface runout of the motor 100, which is more critical for the stability of the movement of the motor rotor shaft relative to the stator coil 105 in the radial direction.

[0100] As shown, the eddy current distance sensor 6 also has a distance sensor 6 shell 63 covering the outside of the eddy current transmission device 61 and the eddy current receiving device 62, and a distance sensor 6 external wiring position 64 on the surface of the shell.

[0101] For example, the eddy current transmission device 61 and the eddy current receiving device 62 are close to the shaft surface of the motor 100, and the distance between them is only in the range of about 1mm-5mm, which is close to or at least in the same order of magnitude as the exposed length of the conductive fiber bundle 231 in the tubular conductive component 23 exposed to the radial inside and contacting the shaft surface of the motor 100. It can be understood that in this scheme, the operation of the eddy current transmission device 61 and the eddy current receiving device 62 and the tubular conductive component 23 still have no interference with each other, although they are arranged very closely.

[0102] Fifth embodiment

[0103] Referring to Fig. 6, the electro-erosion protection device 1 according to a fifth embodiment of the present disclosure differs from the first embodiment only in that the specific functional component in this embodiment is a pickup 71 arranged in the middle region 26 of the first body surface.

[0104] The pickup 71 can be understood as a pickup 71 that picks up the sound emitted by the bearing 101 when the servo motor 100 is in operation and transmits the sound signal to a corresponding analysis IC. By analyzing the audio waveform read in and transmitted out by the pickup 71 when the servo motor 100 is in operation, a mark can be made at a specific noise to facilitate analysis of whether the bearing 101 has significant or excessive damage and the size of the bearing 101 gap and other information related to the working state of the motor 100, which can be further used as a basis for judging the service life of the bearing 101 and the service life of the motor 100.

[0105] The pickup 71 has the characteristics of small size and high digitization rate, and there is no conflict between its integration and the other sensors or sensing devices that need to be arranged in the motor 100. In addition, another advantage of this embodiment is that the electro-erosion protection device 1 needs to be arranged close to the bearing 101 of the motor 100 based on its main function of protecting the bearing 101 of the motor 100 from the risk of shaft voltage breakdown, which makes the pickup 71 in this embodiment very convenient to install in an ideal position suitable for picking up possible noise generated during the operation of the motor 100, without being easily disturbed by other sounds.

[0106] Sixth embodiment

[0107] Referring to Fig. 7, the electro-erosion protection device 1 according to a sixth embodiment of the present disclosure differs from the fifth embodiment only in that the specific functional component in this embodiment is a temperature sensor 72 and / or a humidity sensor arranged in the middle region 26 of the first body surface, which can be used to detect the temperature and / or humidity of the working environment inside the motor 100, providing corresponding data support for the operation, monitoring and control of the servo motor 100.

[0108] Seventh embodiment

[0109] Referring to Figs. 8A-8C, the electro-erosion protection device 1 according to a seventh embodiment of the present disclosure differs from the fifth embodiment only in that the specific functional component in this embodiment is a gas or chemical sensor 73 configured to be able to detect a predetermined type of volatile substance.

[0110] In particular, the gas or chemical sensor 73 can be specifically configured to detect or sense some harmful volatile substances such as oil mist, metal oxide or other volatile substances generated due to damage of the insulation system of the motor 100, which can be generated due to failure or other reasons during operation of the motor 100.

[0111] Another advantage of the present embodiment is that the electro-erosion protection device 1 needs to be arranged close to the bearing 101 of the motor 100 based on its main function of protecting the bearing 101 of the motor 100 from the risk of being punctured by shaft voltage, which makes the gas or chemical sensor 73 in the present embodiment very close to the part where some volatile substances can be generated during operation of the motor 100 and are otherwise usually difficult to be detected, which can help to finely monitor the operation quality of the motor 100, to give early warning of damage and to prevent operation hazards.

[0112] The electro-erosion protection device for motor bearing and the motor with the same according to the above preferred embodiments of the present disclosure can help to meet the requirements of miniaturization design of the servo motor, operation monitoring of the servo motor, bearing protection and other aspects.

[0113] Although the specific embodiments of the present application are described above, those skilled in the art should understand that these are only illustrative, and the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. An electro-erosion protection device for an electric machine bearing, characterized in that, The electric corrosion protection device comprises: a PCB substrate in the shape of a ring or a sector of a ring, the PCB substrate being divided into a radially first side edge region, a radially second side edge region, and an intermediate region therebetween, a plurality of soldered fixing discs being arranged circumferentially in the radially first side edge region of the first main surface of the PCB substrate, the radially first side edge region and the radially second side edge region being opposite to each other along the radial direction of the PCB substrate; a plurality of electrically conductive components, each electrically conductive component being fixedly connected to one of the soldered fixing discs by soldering; a plurality of substrate electrically conductive contacts arranged in the radially second side edge region and configured to be electrically connected to a housing or a grounding terminal of an electric motor; a substrate electrically conductive circuit arranged on the first main surface, the substrate electrically conductive circuit electrically connecting the electrically conductive components and the substrate electrically conductive contacts, thereby allowing a voltage at the electrically conductive components to be discharged to the housing or the grounding terminal of the electric motor via the electrically conductive components, the substrate electrically conductive circuit, and the substrate electrically conductive contacts; at least one special functional component configured for a special function other than voltage discharge and arranged in the intermediate region or in a gap region between the electrically conductive components in the radially first side edge region.

2. An electro-erosion protection device for an electric machine bearing as claimed in claim 1, characterized in that, The electrically conductive components are tubular electrically conductive components, each tubular electrically conductive component having an electrically conductive fiber bundle fixed therein, each tubular electrically conductive component being fixedly connected to one of the soldered fixing discs by soldering, one end of the electrically conductive fiber bundle being exposed out of the tubular electrically conductive component towards a radial inner side or a radial outer side of a motor shaft direction, thereby allowing a voltage at the exposed end of the electrically conductive fiber bundle to be discharged to the housing or the grounding terminal of the electric motor via the substrate electrically conductive circuit and the substrate electrically conductive contacts.

3. An electro-erosion protection device for an electric machine bearing as claimed in claim 1, characterized in that, The special functional component comprises a filter circuit arranged on the first main surface, the filter circuit being formed as part of the substrate electrically conductive circuit and configured to pass and / or neutralize an alternating current of a predetermined frequency.

4. An electro-erosion protection device for an electric machine bearing as claimed in claim 3, characterized in that, The filter circuit has a medium frequency filter circuit configured to pass and neutralize electric charges in a frequency range of 0-40 KHZ and a high frequency filter circuit configured to pass and neutralize electric charges in a frequency range of 40 KHZ-200 MHZ.

5. An electro-erosion protection device for an electric machine bearing as claimed in claim 1, characterized in that, The special functional component comprises an inductive encoder assembly having an inductive eddy current coil and an eddy current analysis IC, wherein the inductive eddy current coil and the eddy current analysis IC are arranged in the intermediate region.

6. An electro-erosion protection device for an electric machine bearing as claimed in claim 5, characterized in that, The inductive eddy current coil and the eddy current analysis IC are arranged on a second main surface of the PCB substrate, wherein the second main surface is opposite to the first main surface.

7. An electro-erosion protection device for an electric machine bearing as claimed in claim 1, characterized in that, The special functional component comprises a Hall encoder having a plurality of Hall sensors and a Hall effect analysis IC, wherein the plurality of Hall sensors are distributed equidistantly in a circumferential direction.

8. An electro-erosion protection device for an electric machine bearing as claimed in claim 1, characterized in that, The specific functional components include an eddy current distance sensor having an eddy current transmitting device and an eddy current receiving device, wherein the eddy current transmitting device and the eddy current receiving device are arranged at or close to the radial first side edge end of the PCB substrate, or arranged close to the shaft of the motor.

9. An electro-erosion protection device for an electric machine bearing as claimed in claim 7 or 8, characterized in that, The plurality of conductive components are arranged to have several narrow gaps and several wide gaps between each other in the circumferential direction, so that the conductive components except those located at both sides of the several wide gaps are closely arranged in the circumferential direction, wherein the plurality of Hall sensors and / or the eddy current distance sensor are arranged in the several wide gaps, close to the radial first side edge end of the PCB substrate.

10. An electro-erosion protection device for an electric machine bearing as claimed in claim 1, characterized in that, The specific functional components include a sound pickup, a temperature sensor and / or a humidity sensor, which are arranged in the intermediate area of the first main surface; And / or The specific functional components include a gas or chemical sensor configured to detect a predetermined type of volatile matter.

11. An electro-erosion protection device for an electric machine bearing as claimed in any one of claims 1-10, characterized in that, The specific functional components include a communication module electrically connected to all sensors to receive their sensing signals, and used to send the sensing signals to a monitoring terminal.

12. An electro-erosion protection device for an electric machine bearing as claimed in any one of claims 1-10, characterized in that, The electro-erosion protection device further comprises: A wire interface component arranged in the intermediate area and connected with a signal transmission line or a power line for the specific functional components.

13. An electro-erosion protection device for an electric machine bearing as claimed in any one of claims 1-10, characterized in that, The electro-erosion protection device further comprises: A plurality of groups of conductive contact component assemblies, each group of conductive contact component assemblies comprising a fastening hole and a conductive metal sheet arranged at least partially around the fastening hole, thereby forming a substrate conductive contact.

14. An electro-erosion protection device for an electric machine bearing as claimed in any one of claims 1-10, characterized in that, The radial first side edge is a radial inner edge, and the radial second side edge is a radial outer edge.

15. An electric machine comprising the electro-erosion protection device according to any one of claims 1-14, wherein, The PCB substrate is fixedly connected to the housing of the motor, and the conductive components directly or indirectly contact the shaft of the motor to be conductively connected thereto.

16. The electric machine of claim 15, comprising the electro-erosion protection device of claim 5 or 6, wherein, The motor further comprises a reflective target plate fixedly connected to the shaft of the motor and facing the inductive eddy current coil, and a plurality of metal target plates arranged in the circumferential direction.

17. The electric machine of claim 15, comprising the electro-erosion protection device of claim 7 or 9, wherein, The motor further comprises an inductive magnet or a magnetic shaft installed at the shaft end side thereof, and the plurality of Hall sensors are arranged on the main surface of the PCB substrate facing the shaft end side. The motor further comprises an inductive magnet or a magnetic shaft installed at the shaft end side thereof, and the plurality of Hall sensors are arranged on the main surface of the PCB substrate facing the shaft end side.

Images