Electrocorrosion protection device for motor bearing and motor comprising same

Abstract

The invention discloses an electrocorrosion protection device for a motor bearing and a motor comprising the electrocorrosion protection device, and the electrocorrosion protection device comprises an annular or fan-annular PCB substrate which is divided into a radial inner edge region, a radial outer edge region and a middle region between the radial inner edge region and the radial outer edge region; conductive fiber bundles are fixed in the tubular conductive components; a plurality of substrate conductive contacts located in the radial outer edge area and configured to be electrically connected to a housing or a ground terminal of the motor; the substrate conduction circuit is arranged on the surface of the first main body and allows the voltage at the exposed end of the conductive fiber bundle to be released to a shell or a grounding end of the motor through the substrate conduction circuit and the substrate conductive contact; the specific function component is arranged in the middle area or in the gap area between the tubular conductive components in the radial inner edge area. According to the invention, the requirements of miniaturization design of the servo motor, operation monitoring of the servo motor, bearing protection and the like can be met.

Description

Technical Field

[0001] The present disclosure relates to the field of motors, and more particularly to an electric corrosion protection device for a motor bearing and a motor comprising the same. Background Art

[0002] At present, during the use of the motor, a bearing protection device is used to protect the motor to solve the problem of electrical corrosion of the bearings of the variable frequency motor. The bearing protection device can effectively control the shaft voltage and bearing current to protect the bearings. In particular, when the servo motor or variable frequency motor is working, the shaft voltage generated by the capacitance effect, electromagnetic effect, and electrostatic effect of rotating friction on the shaft may break down the bearings in the motor and damage the bearings. For this reason, it is necessary to use a bearing protection device to form a conductive path with lower resistance so that the shaft voltage in the motor can release the voltage through this path, thereby effectively protecting the bearings in the motor. Among them, an existing method mainly uses conductive fibers to flexibly connect the machine shaft and communicate with the grounded part of the casing, so that the voltage formed on the shaft is released through this path where the conductive fibers are located to reduce the voltage difference between the shaft and the ground.

[0003] However, most existing bearing protection devices are designed in a manner that the conductive fibers are installed and then pressure is applied to the body, thereby deforming the pressure-applying portion to fix the conductive fibers. This causes the body to deform slightly during the pressure-applying process, which affects the accuracy of the product's appearance, often resulting in service life being affected during later use, and even causing adverse effects such as wear on multiple shaft parts. At the same time, the existing bearing protection device has a complicated manufacturing process, and the production, use, and installation procedures are relatively cumbersome, resulting in an increase in cost.

[0004] In order to eliminate the above-mentioned defects in the design of bearing protection devices in most of the prior arts, enterprises and their engineers in this field and related technical fields have proposed many improved solutions. However, most of the solutions still fail to reach a sufficiently satisfactory level in terms of product precision control and the complexity of mass production processing procedures. In particular, the design of bearing protection devices often places high precision and high complexity requirements on the processing procedures, which will result in high costs in mass production.

[0005] Among these improvement schemes, the technical progress achieved by Chinese patent applications CN 114448178 A and CN 118199337A is more obvious. In particular, the improvement scheme of the latter realizes the splitting of production links to a large extent, which helps to improve production efficiency and reduce production costs. At the same time, the processes involved in the production and assembly of bearing protection devices are more suitable for automated production and reduce or even avoid dependence on high-precision machining links.

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

[0007] Since servo motors are widely used in various fields, their performance and precision directly affect the operating efficiency and operating quality of the equipment using them as the driving source. Therefore, in some fields, it is often necessary to monitor or detect parameters directly related to the working state of the servo motor, such as the motor's speed, direction and angle, and in other fields, it is necessary to monitor or detect parameters indirectly related to the working state of the servo motor, such as temperature, etc., which are related to certain characteristics of the environment in which the servo motor is located. Therefore, the servo motors used in some fields not only need to be provided with the above-mentioned existing bearing protection device in order to effectively control the shaft voltage and bearing current, but also need to be provided with a detection device or sensor device associated with the motor rotor for the aforementioned monitoring purpose. In order for these devices and components to work without interfering with each other, it is inevitable that a large space inside the motor housing is required, especially a large space near the end side of the machine shaft, and therefore it is necessary to leave enough space inside the housing in the axial direction on the end side of the machine shaft to meet the above needs. This has caused the difficulty in taking into account the operation monitoring, bearing protection and miniaturization design of the servo motor to a certain extent.

[0008] Therefore, there is an urgent need to provide a new solution to at least partially alleviate or solve the above-mentioned problems and defects of the existing solutions. Summary of the invention

[0009] One object of the present disclosure is to propose a new electrical corrosion protection device for motor bearings and a motor including the same in order to at least partially alleviate or even eliminate the above-mentioned defects existing in the motor bearing protection device in the prior art.

[0010] The present disclosure provides an electric corrosion protection device for a motor bearing, wherein the electric corrosion protection device comprises:

[0011] A PCB substrate in an annular or fan-shaped shape, wherein the PCB substrate is divided into a radial first side edge region, a radial second side edge region, and an intermediate region therebetween, and a plurality of welding fixing plates are circumferentially arranged in the radial first side edge region on the first main body surface of the PCB substrate;

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

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

[0014] A substrate conductive circuit is provided on the surface of the first body, the substrate conductive circuit electrically connects the conductive component and the substrate conductive contact, so as to allow the voltage to be released to the housing or the ground terminal of the motor via the conductive component, the substrate conductive circuit and the substrate conductive contact;

[0015] At least one specific function component is configured for a specific function other than voltage release and is arranged in the middle region or in a gap region between the conductive components in the radial first side edge region.

[0016] In general, the technical solution proposed in the present disclosure is based on the following basic technical insight, that is, by using a partially annular PCB board to load multiple conductive components, it is possible to construct such an innovative basic structure of an electrical corrosion protection device for motor bearings in the form of a conductive ring. For motors, especially servo motors, the length or axial dimension along their shafts is often crucial to the miniaturization of the motors and the space they occupy in related electric drive devices. As for the electrical corrosion protection device, in order to conduct the shaft voltage and the bearing current from the bearings to the motor grounding terminal (such as the motor housing) to achieve protection for the bearings, an electrical conduction structure or design from the shaft near the bearings to the grounding terminal is in fact essential.

[0017] This means that in order to provide better electrical corrosion protection, an electrical conduction structure as described above needs to be provided at a certain axial position on the motor shaft near the motor bearing, which guides the current radially outward from the shaft to the ground terminal usually located radially outside the motor. Since the structural characteristics of many motors themselves make them have a certain radial space or radial spacing between the shaft and the ground terminal, the present disclosure uses a PCB substrate as the carrier of the above-mentioned electrical conduction structure to provide a space that is suitable for additional arrangement of specific functional components for the motor (and certain functions related to the motor) in the space that is already basically occupied by the electrical conduction structure. This 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 electrical corrosion protection device in a manner that greatly saves motor space or even occupies almost no additional space (especially the space along the length of the shaft or the axial direction). The above advantages of the present disclosure and other further advantages can be more clearly seen from the various embodiments and illustrated examples described below.

[0018] According to one embodiment of the present disclosure, the conductive component is a tubular conductive component, a conductive fiber bundle is fixed in each tubular conductive component, each tubular conductive component is fixedly connected to a welding fixing plate by welding, and one end of the conductive fiber bundle is exposed from the tubular conductive component toward the radial inner side or radial outer side of the motor shaft, thereby allowing the voltage at the exposed end of the conductive fiber bundle to be released to the housing or grounding end of the motor via the substrate conductive circuit and the substrate conductive contact. For example, one end of the conductive fiber bundle is exposed toward the radial inner side of the motor shaft so as to be in soft contact with the motor shaft, and thereby the voltage at the exposed end of the conductive fiber bundle is released to the housing or grounding end (located radially outside) of the motor via the substrate conductive 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 disposed on the surface of the first body, the filter circuit forms a part of the substrate conduction circuit and is configured to conduct and / or neutralize an alternating current of a predetermined frequency.

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

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

[0023] According to an embodiment of the present disclosure, 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.

[0024] According to one 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 at equal intervals along the circumferential direction.

[0025] According to one 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 to be located at or close to the radial first side edge end of the PCB substrate, or are arranged to be close to the shaft of the motor.

[0026] According to one embodiment of the present disclosure, the plurality of conductive components are arranged to leave a plurality of narrow gaps and a plurality of wide gaps between each other along the circumferential direction, so that the conductive components except those located on both sides of the plurality of wide gaps are closely arranged along the circumferential direction, wherein the plurality of Hall sensors and / or the eddy current distance sensors are arranged in the plurality of wide gaps, so as to be close to the radial first side edge end of the PCB substrate.

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

[0028] The specific function component includes a gas or chemical substance sensor configured to detect a predetermined type of volatile substance.

[0029] According to an embodiment of the present disclosure, the specific functional component includes a communication module, which is electrically connected to all sensors to receive their sensing signals and is used to send 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 may be integrated / arranged simultaneously on a PCB substrate, the integrated plurality of specific functional components may be insulated and isolated from each other, and the sensing component part and the associated analysis IC may also be insulated and isolated outside the signal transmission path, and a plurality of analysis ICs may be appropriately integrated into a single analysis IC.

[0031] According to one embodiment of the present disclosure, the electrical corrosion protection device further comprises:

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

[0033] According to one embodiment of the present disclosure, the electrical corrosion protection device further comprises:

[0034] A plurality of groups of conductive contact assemblies are provided, each group of conductive contact assemblies comprising a fastening hole and a conductive metal sheet at least partially surrounding the fastening arrangement, thereby forming a substrate conductive contact.

[0035] The present disclosure also relates to a motor, comprising the electrical corrosion protection device described in any of the above embodiments, wherein the PCB substrate is fixedly connected to the housing of the motor, and the conductive component directly or indirectly contacts the shaft of the motor to be conductively connected thereto.

[0036] According to one embodiment of the present disclosure, the motor further includes a reflective target plate, which is fixedly connected to the shaft of the motor and faces the inductive eddy current coil, and includes a plurality of metal target sheets arranged in a circumferential direction, and the reflective target plate may optionally have a middle fixing hole for fixing the shaft.

[0037] According to one embodiment of the present disclosure, the motor further includes an induction magnet or a magnetic shaft mounted on an end side of the shaft thereof, and the plurality of Hall sensors are arranged on a main body surface of the PCB substrate facing the end side of the shaft.

[0038] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present disclosure.

[0039] The positive and progressive effects of this disclosure are:

[0040] The electrical corrosion protection device for motor bearings and the motor according to the present disclosure are helpful to take into account the miniaturization design of the motor (especially the servo motor), the operation monitoring of the servo motor, the bearing protection and other requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A side perspective schematic diagram of an exemplary electric machine is shown, in which an electric corrosion protection device for a motor bearing according to a preferred embodiment of the present disclosure is appropriately installed or assembled.

[0042] Figure 2A The front view (ie, viewed from the first main body surface of the electrical corrosion protection device) of the electrical corrosion protection device for a motor bearing according to the first embodiment is schematically shown.

[0043] Figure 2B The back view (ie, viewed from the second main body surface of the electrical corrosion protection device) of the first embodiment is schematically shown.

[0044] Figure 3A A front view schematically shows an electrical corrosion protection device for a motor bearing according to a second embodiment.

[0045] Figure 3B A rear view of the electrical corrosion protection device of the second embodiment is schematically shown.

[0046] Figure 3C The figure schematically shows a side perspective view of a motor equipped with the electric corrosion protection device of the second embodiment and a reflective target plate.

[0047] Figure 3D Schematically shows Figure 3C The reflective target plate in the.

[0048] Figure 4A A front view schematically shows an electrical corrosion protection device for a motor bearing according to a third embodiment.

[0049] Figure 4B A back view of the electrical corrosion protection device according to the third embodiment is schematically shown.

[0050] Figure 4C The side perspective view of a motor equipped with the electro-corrosion protection device and magnets according to the third embodiment is schematically shown, wherein the magnets are installed on the end side of the shaft.

[0051] Figure 5A A front view schematically shows an electrical corrosion protection device for a motor bearing according to a fourth embodiment.

[0052] Figure 5B A back view of the electrical corrosion protection device according to the fourth embodiment is schematically shown.

[0053] Figure 5C The figure schematically shows an axial perspective view of a motor equipped with an electric corrosion protection device according to a fourth embodiment.

[0054] Figure 5D Schematically shows Figure 5C An exemplary structure of an eddy current distance sensor having an eddy current transmitting device and an eddy current receiving device.

[0055] Figure 6 A front view schematically shows an electrical corrosion protection device for a motor bearing according to a fifth embodiment.

[0056] Figure 7 A front view schematically shows an electric corrosion protection device for a motor bearing according to a sixth embodiment.

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

[0058] Figure 8BA partial cross-sectional view schematically shows the installation state of the electric corrosion protection device of the seventh embodiment installed in a motor.

[0059] Figure 8C The figure schematically shows an axial perspective view of a motor equipped with the electric corrosion protection device according to the seventh embodiment.

[0060] Description of reference numerals:

[0061] 100: Motor

[0062] 101: Bearings

[0063] 102: Crankshaft

[0064] 103: Crankshaft end side

[0065] 104: Shell

[0066] 105: Stator coil

[0067] 1: Electrical corrosion protection device

[0068] 2: PCB substrate

[0069] 21: Fastening hole

[0070] 22: Conductive metal sheet

[0071] 23: Tubular conductive components

[0072] 231: Conductive fiber bundle

[0073] 24: Radial inner edge area

[0074] 25: Radial outer edge area

[0075] 26: Middle area

[0076] 3: Filter circuit

[0077] 41: Inductor eddy current coil

[0078] 42: Eddy current analysis IC

[0079] 43: Reflective target

[0080] 431: Middle fixing hole

[0081] 432: Metal Target

[0082] 51: Hall sensor

[0083] 52: Hall Effect Analysis IC

[0084] 53: Induction magnet

[0085] 6: Eddy current distance sensor

[0086] 61: Eddy current launch device

[0087] 62: Eddy current receiving device

[0088] 63: Distance sensor housing

[0089] 64: Distance sensor external wiring

[0090] 71: Pickup

[0091] 72: Temperature sensor

[0092] 73: Gas or chemical sensor

[0093] 81: Binding Post

[0094] 82: Signal transmission line or power line DETAILED DESCRIPTION

[0095] The preferred embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings of the specification. The following description is exemplary and not limiting of the present invention. Any other similar situations also fall within the protection scope of the present invention.

[0096] In the following detailed description, directional terms, such as "left", "right", "up", "down", "front", "rear", etc., are used with reference to the directions described in the drawings. The components of the embodiments of the present invention can be placed in a variety of different directions, and the directional terms are used for illustrative purposes rather than limiting.

[0097] From the above description and the following more detailed exemplary description of the electro-corrosion 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 multiple preferred embodiments (examples) of the present disclosure not only provide electro-corrosion protection devices with reliable bearing protection performance and low production and processing costs (the required processing steps are all capable of mass production at a lower cost and the processing equipment has low complexity), but also the provided electro-corrosion protection devices are much superior to the relevant prior art solutions in terms of functional integration and space utilization efficiency (saving or reducing space occupancy).

[0098] Figure 1An exemplary motor 100 is shown, in which the electric corrosion protection device 1 for the bearing 101 of the motor 100 according to the first embodiment of the present disclosure is appropriately installed or assembled. It should be noted that in the following description of each embodiment, in addition to the differences in configuration and installation caused by each specific exemplary specific functional component due to its own unique characteristics, in terms of the assembly relationship, assembly position, etc. of the electric corrosion protection device 1, especially the PCB substrate 2 as the bearing body, assembled to the motor 100, Figure 1 Some common aspects and features of various embodiments are shown, and the technical advantages brought about by them can also be understood to have certain similarities, such as technical advantages in terms of functional integration and space utilization efficiency.

[0099] In addition, it should be understood that the specific devices and components shown in the following specific embodiments and the drawings thereof are for the purpose of facilitating the understanding of various implementations of the present disclosure. These specific examples are not intended to limit the scope of protection of the present disclosure. Due to space limitations, the following specific embodiments illustrate the basic design in which a plurality of welding fixing plates and a plurality of tubular conductive components 23 are circumferentially arranged in the radial inner edge region 24 of the PCB substrate 2. However, on the contrary, another feasible approach is to arrange a plurality of welding fixing plates and a plurality of tubular conductive components 23 circumferentially in the radial outer edge region 25 of the PCB substrate 2.

[0100] Furthermore, it will be seen from the following description that the following multiple embodiments can be combined together as needed to create other embodiments in addition to the multiple embodiments described below and shown in the drawings, and it can be understood that the other embodiments created in this way may achieve further improvements in the above technical advantages.

[0101] First embodiment

[0102] refer to Figure 1 and Figure 2A-2B As shown, the electrical corrosion protection device 1 for the bearing 101 of the motor 100 according to the first embodiment of the present disclosure includes:

[0103] A PCB substrate 2 in the shape of an annular ring or a sector ring (not shown in the figure, but can be understood as a sector ring part of the substrate shown in the figure), the PCB substrate 2 is divided into a radial inner edge area 24, a radial outer edge area 25 and an intermediate area 26 therebetween, and a plurality of welding fixing plates are arranged circumferentially in the radial inner edge area 24 of the first main body surface of the PCB substrate 2;

[0104] A plurality of tubular conductive components 23, each of which has a conductive fiber bundle 231 fixed therein and fixedly connected to a welding fixing plate by welding, so that one end of the conductive fiber bundle 231 is exposed radially inward from the tubular conductive component 23;

[0105] A plurality of substrate conductive contacts, which are located in the radial outer edge region 25 and are configured to be electrically connected to a housing or a ground terminal of the motor 100;

[0106] A substrate conduction circuit is provided on the surface of the first body, the substrate conduction circuit electrically connects the tubular conductive component 23 and the substrate conductive contact, thereby allowing the voltage at the exposed end of the conductive fiber bundle 231 to be released to the housing or grounding end of the motor 100 via the substrate conduction circuit and the substrate conductive contact;

[0107] The specific functional component is a filter circuit 3 arranged on the surface of the first body. The filter circuit 3 forms a part of the substrate conduction circuit (not shown in the figure) and is configured to conduct and / or neutralize an alternating current of a predetermined frequency.

[0108] Among them, Figure 2A As shown, the filter circuit 3 is basically arranged in the middle area 26, or at least most of the filter circuit 3 is arranged in the middle area 26, which is also optional. Figure 2A The filter circuit 3 shown in the figure has two circuit parts, namely, a medium frequency filter circuit 3 and a high frequency filter circuit 3. The medium frequency filter circuit 3 is configured to conduct and neutralize charges in the frequency range of 0-40KHZ, and the high frequency filter circuit 3 is configured to conduct and neutralize charges in the frequency range of 40KHZ-200MHZ.

[0109] Further references include Figure 2A As shown, the tubular conductive component 23 that can be mass-produced in a modular form can be fixedly connected to the welding fixing plate on the surface of the first body by welding. Although the welding fixing plate is not shown in the figure, it can be understood that the welding fixing plate is roughly located near the inner edge of the PCB substrate 2, and the tubular conductive component 23 is fixed to the inner edge of the front side of the PCB substrate 2 through welding. Figure 2B As shown, a series of snap-in grooves may also be provided near the inner edge of the PCB substrate 2, and the tail of the tubular conductive component 23 (opposite to the exposed end of the conductive fiber bundle 231) may be provided with a tail protrusion corresponding to the snap-in groove, which can be conveniently snapped into the snap-in groove to complete positioning and play a certain reinforcement role.

[0110] It should be understood that the tubular conductive component 23 mounted on the welding fixing plate on the surface of the first main body has a certain thickness due to the conductive fiber bundle 231 contained therein. Figure 1In the installation state shown, the axial direction is consistent with the bearing 101 or away from the shaft end side 103 of the motor 100. One advantage of the filter circuit 3 arranged in the above manner is that the radial space of the motor 100 shaft is fully utilized, and the circuit elements of the filter circuit 3, such as the required capacitors, resistors and inductors, are basically not adversely affected on the space utilization efficiency or miniaturization requirements of the motor 100 as long as they are in a size range similar to the thickness of the tubular conductive component 23.

[0111] Further references Figure 2A and 2B As shown, according to a preferred configuration, the electro-corrosion protection device 1 also includes several groups of conductive contact assemblies, each group of conductive contact assemblies includes a fastening hole 21 and a conductive metal sheet 22 at least partially arranged around the fastening, thereby forming a substrate conductive contact. The fastening hole 21 can be, for example, a threaded hole or a riveted hole. This design can use fasteners such as screws and rivets to fix the outer edge of the PCB substrate 2 to the housing 104 (grounding terminal) of the motor 100 through the fastening hole 21 and reliably contact or abut each other. The end of the conductive fiber bundle 231 exposed toward the radial inside is in contact with the shaft 102 of the motor 100. The metal fasteners not only complete the fixed connection, but also play a conductive role with the help of the metal sheet. At the same time, the metal sheet also plays a beneficial role in strengthening the structural strength at the connection position and improving the long-term reliability. Among them, the PCB substrate 2 is fixedly connected to the housing 104 of the motor 100,

[0112] refer to Figure 2A-2B Another advantageous aspect of this preferred embodiment is that the filter circuit 3 is arranged on the side where the conductive components are installed, which facilitates better production and installation. In addition, when integrating other functional components, more space can be reserved for other components, thereby contributing to further improving the functional integration of the electrical corrosion protection device 1.

[0113] It is understandable that the assembly and basic design of the electrical corrosion protection device 1 and its PCB substrate 2 and the specific configuration of the several groups of conductive contact components arranged therein are also basically the same design in the other embodiments described below, so it will not be repeated in the following. However, a notable difference between the other embodiments described below and the first embodiment is that the following embodiments all integrate a certain sensor function related to detecting or monitoring the operation of the motor 100 in the electrical corrosion protection device 1.

[0114] Second embodiment

[0115] The electrical corrosion protection device 1 according to the second embodiment of the present disclosure is mainly different from the first embodiment in the following aspects.

[0116] refer to Figures 3A-3D As shown, the specific functional components in this embodiment are an inductive encoder assembly having an inductive eddy current coil 41 and an eddy current analysis IC 42 (an 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 middle area 26. And further preferably, the inductive eddy current coil 41 and the eddy current analysis IC 42 are arranged on the second main body surface of the PCB substrate 2, wherein the second main body surface is opposite to the first main body surface.

[0117] refer to Figure 3C As shown, the inductive encoder assembly in this embodiment is used in conjunction with a reflective target plate 43 disposed on the shaft end side 103 of the motor 100. The reflective target plate 43 has a middle fixing hole 431 and a plurality of metal target plates 432 arranged along the circumferential direction. The reflective target plate 43 is fixedly connected to the shaft 102 of the motor 100 via the middle fixing hole 431 and faces the inductive eddy current coil 41.

[0118] The target plate rotates together with the rotor of the motor 100 and reflects the magnetic field to the inductor eddy current coil 41 according to its position.

[0119] The inductive encoder component of the present embodiment works in the following manner, that is, the inductive eddy current coil 41 receives the electromagnetic field reflected by the target plate, generates a set of three AC signals, and transmits the signals to the eddy current analysis IC 42. By collecting the AC electromagnetic signals and analyzing them by the eddy current analysis IC 42, the working state parameters of the servo motor 100 or the variable frequency motor 100, such as the instantaneous speed, direction, rotation angle, etc. of the motor 100, are obtained based on the AC electromagnetic signals and their changes. Therefore, the integrated solution can provide real-time monitoring of the working state of the motor 100.

[0120] Further references Figures 3A-3C As shown, the electro-corrosion protection device 1 further includes a wire interface component in the form of, for example, a terminal post 81 or a row of terminal slots or a terminal port, which is arranged in the middle area 26 and is connected with a signal transmission line or power line 82 for a specific functional component. This is particularly beneficial in the case where the electro-corrosion protection device 1 is integrated with multiple sensors or sensing devices. For example, in the case where the electro-corrosion protection device 1 simultaneously integrates different sensor devices of this embodiment and one of the following embodiments, the wire interface component can provide a non-interfering and orderly layout of the power line 82 and the signal transmission line.

[0121] In addition, the specific functional components may also include, for example, a communication module, which is electrically connected to all sensors to receive their sensing signals and is used to send the sensing signals to the monitoring terminal.

[0122] It is understandable that the wire interface component and communication module configuration described above may be applicable to other embodiments described below.

[0123] Third embodiment

[0124] The electrical corrosion protection device 1 according to the third embodiment of the present disclosure mainly differs from the second embodiment only in the following aspects.

[0125] refer to Figures 4A-4C As shown, the specific functional components in this embodiment are a Hall encoder including a plurality of Hall sensors 51 and a Hall effect analysis IC 52, wherein the plurality of Hall sensors 51 are equally spaced along the circumferential direction. Furthermore, preferably, the plurality of tubular conductive components 23 are arranged with a plurality of narrow gaps and three uniformly distributed wide gaps between each other along the circumferential direction, so that the tubular conductive components 23 other than those located at both sides of the plurality of wide gaps are closely arranged along the circumferential direction, wherein the plurality of Hall sensors 51 are arranged in the three wide gaps, so as to be close to the radial inner edge of the PCB substrate 2. This utilizes the characteristics that the Hall sensors 51 and the tubular conductive components 23 do not affect each other in terms of work and function, and provides an integrated solution with better space utilization.

[0126] refer to Figure 4C The Hall encoder in this embodiment is used in conjunction with the induction magnet 53 or the magnetic shaft installed on the shaft end side 103 thereof, and a plurality of Hall sensors 51 are arranged on the main body surface of the PCB substrate 2 facing the shaft end side 103 .

[0127] The Hall encoder assembly of this embodiment works in the following manner: the magnetic shaft or induction magnet 53 at the shaft end of the motor 100 rotates with the rotor, and the magnetic signal of the magnetic shaft or magnet is received by the Hall sensor 51, converted into an electrical signal and transmitted to the analysis IC, and the Hall effect analysis IC 52 analyzes the electrical signal generated by the magnetic field strength on the shaft, thereby achieving the purpose of monitoring the working state of the servo motor 100 or the variable frequency motor 100, and it can also realize the real-time monitoring of the speed, direction, rotation angle and other parameters of the motor 100. An additional advantage of this embodiment is that its cost is lower than that of the second embodiment, and it plays a similar role.

[0128] Fourth embodiment

[0129] The electrical corrosion protection device 1 according to the fourth embodiment of the present disclosure is mainly different from the first embodiment in the following aspects.

[0130] refer to Figures 5A-5DAs shown, the specific functional components in this embodiment are an eddy current distance sensor 6 having 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 to be located at or close to the radial inner edge of the PCB substrate 2, or arranged to be close to the shaft 102 of the motor 100.

[0131] The electric corrosion protection device 1 of this embodiment is equivalent to an integrated device that utilizes the eddy current effect to measure the distance between an object and a sensor probe, and it works in the following manner, that is, the eddy current transmitting device 61 in the eddy current distance sensor 6 mainly emits an eddy current magnetic field in a radially inward direction (toward the axial surface of the motor 100 shaft 102), and the axial surface generates a reflection signal in response to the eddy current magnetic field so that the eddy current receiving device 62 receives the reflection signal, and then the runout size of the computer shaft 102 (axial surface) during movement can be more accurately calculated based on the waveform difference between the transmitted signal and the received reflected signal, that is, the detection of the shaft runout amplitude of the main shaft when the motor 100 is working can be realized.

[0132] Further applications based on this may include detecting the spindle runout of the motor 100 after a long period of operation and the ratio of the spindle runout under load and no-load conditions, thereby more timely discovering possible problems with the servo motor 100, thereby providing early warning or discovering operating risks or defects of the motor 100.

[0133] And, more preferably, especially with reference to Figure 5A and 5C As shown, a plurality of tubular conductive components 23 are arranged with a plurality of narrow gaps and a wide gap between them along the circumferential direction, so that the tubular conductive components 23 other than those located at both sides of the plurality of wide gaps are closely arranged along 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 of the PCB substrate 2. This not only achieves a better effect in terms of space utilization efficiency of the integrated solution, but also such a close arrangement helps to more accurately measure the axial runout of the motor 100, which is critical to the stability of the movement of the motor rotor shaft relative to the stator coil 105 in the radial direction.

[0134] As shown in the figure, the eddy current distance sensor 6 further comprises a distance sensor 6 housing 63 covering the eddy current transmitting device 61 and the eddy current receiving device 62 and an external connection point 64 of the distance sensor 6 located on the surface of the housing.

[0135] For example, the eddy current emitting device 61 and the eddy current receiving device 62 are close to the axial surface of the motor 100, and the distance from the axial surface of the motor 100 is only about 1mm-5mm, which is roughly close to the exposed length of the conductive fiber bundle 231 in the tubular conductive component 23 that is exposed radially inward and contacts the axial surface of the motor 100, or at least the two are in the same order of magnitude. It can be understood that in this solution, the eddy current emitting device 61 and the eddy current receiving device 62 and the tubular conductive component 23 still work without interfering with each other, although they are arranged very closely.

[0136] Fifth embodiment

[0137] refer to Figure 6 As shown, the electrical corrosion protection device 1 according to the fifth embodiment of the present disclosure is mainly different from the first embodiment in that the specific functional component in this embodiment is a pickup 71 arranged in the middle area 26 of the first main body surface.

[0138] The pickup 71 can be understood as a pickup 71, which collects the sound of the bearing 101 rotating when the servo motor 100 is working, and transmits the sound signal to the corresponding analysis IC. When the servo motor 100 is working, by analyzing the audio waveform read in and transmitted by the pickup 71, it is possible to mark specific noises, so as to analyze whether the bearing 101 has obvious or excessive damage and the size of the bearing 101 gap and other information related to the working state of the motor 100. This information can be further used as a basis for judging the life of the bearing 101 and the life of the motor 100.

[0139] The microphone 71 has the characteristics of small size and high digitization rate, and there is no conflict between its integration and other sensors or sensing devices that need to be installed in the motor 100. In addition, another advantage of this embodiment is that the electro-corrosion protection device 1 needs to be installed close to the bearing 101 of the motor 100 based on its main function of protecting the motor 100 bearing 101 from the risk of breakdown by shaft voltage, which makes the microphone 71 in this embodiment very convenient to install in an ideal position suitable for collecting possible noises generated during the operation of the motor 100, and is not easily disturbed by other sounds.

[0140] Sixth embodiment

[0141] refer to Figure 7As shown, the electric corrosion protection device 1 according to the sixth embodiment of the present disclosure mainly differs from the fifth embodiment in that the specific functional components in this embodiment are temperature sensors 72 and / or humidity sensors, which are arranged in the middle area 26 of the surface of the first main body, and can be used to detect the temperature and / or humidity of the working environment inside the motor 100, and provide corresponding data support for the operation, monitoring and control of the servo motor 100.

[0142] Seventh embodiment

[0143] refer to Figures 8A-8C As shown, the electric corrosion protection device 1 according to the seventh embodiment of the present disclosure is mainly different from the fifth embodiment in that the specific functional component in this embodiment is a gas or chemical sensor 73, which is configured to detect a predetermined type of volatile matter.

[0144] In particular, the gas or chemical sensor 73 can be specifically configured to specifically detect or probe some damaging volatile substances that may be generated during the operation of the motor 100 due to faults or other reasons, such as oil mist, metal oxides, or other volatile substances generated when the insulation system of the motor 100 is damaged.

[0145] Another advantage of this embodiment is that the electro-corrosion 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 breakdown by shaft voltage. This makes the gas or chemical sensor 73 in this embodiment very close to the part of the motor 100 where some volatile substances may be generated during operation and are usually difficult to detect in other ways. This can help to finely monitor the operating quality of the motor 100, warn of damage, and prevent hidden dangers in operation.

[0146] The electrocorrosion protection device for motor bearings and the motor having the electrocorrosion protection device according to the above-mentioned preferred embodiments of the present disclosure help to take into account the miniaturized design of the servo motor, the operation monitoring of the servo motor, the bearing protection and other requirements.

[0147] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An electrical corrosion protection device for motor bearings, characterized in that: The electrical corrosion protection device comprises: A PCB substrate in an annular or fan-shaped shape, the PCB substrate is divided into a radial first side edge region, a radial second side edge region and an intermediate region therebetween, a plurality of welding fixing plates are circumferentially arranged in the radial first side edge region on the first main body surface of the PCB substrate, and the radial first side edge region and the radial second side edge region are opposite to each other along the radial direction of the PCB substrate; A plurality of conductive components, each conductive component is fixedly connected to a welding fixing plate by welding; a plurality of substrate conductive contacts, the substrate conductive contacts being located in the radial second side edge region and being configured to be electrically connected to a housing of the motor or a ground terminal; A substrate conductive circuit is provided on the surface of the first body, the substrate conductive circuit electrically connects the conductive component and the substrate conductive contact, so as to allow the voltage to be released to the housing or the ground terminal of the motor via the conductive component, the substrate conductive circuit and the substrate conductive contact; At least one specific function component is configured for a specific function other than voltage release and is arranged in the middle region or in a gap region between the conductive components in the radial first side edge region.

2. The electrical corrosion protection device for motor bearings according to claim 1, characterized in that: The conductive component is a tubular conductive component, each of which has a conductive fiber bundle fixed therein, and each tubular conductive component is fixedly connected to a welding fixing plate by welding, with one end of the conductive fiber bundle exposing the tubular conductive component toward the radial inside or radial outside of the motor shaft, thereby allowing the voltage at the exposed end of the conductive fiber bundle to be released to the motor casing or the grounding terminal via the substrate conductive circuit and the substrate conductive contact.

3. The electrical corrosion protection device for motor bearings according to claim 1, characterized in that: The specific functional component comprises a filter circuit disposed on the surface of the first body, the filter circuit forms a part of the substrate conduction circuit and is configured to conduct and / or neutralize an alternating current of a predetermined frequency.

4. The electrical corrosion protection device for motor bearings according to claim 3, characterized in that: The filter circuit has a medium frequency filter circuit and a high frequency filter circuit. The medium frequency filter circuit is configured to conduct and neutralize charges in the frequency range of 0-40KHZ, and the high frequency filter circuit is configured to conduct and neutralize charges in the frequency range of 40KHZ-200MHZ.

5. The electrical corrosion protection device for motor bearings according to claim 1, characterized in that: The specific functional components include an inductive encoder component having an eddy current coil and an eddy current analysis IC, wherein the eddy current coil and the eddy current analysis IC are arranged in the middle area.

6. The electrical corrosion protection device for motor bearings according to claim 5, characterized in that: The inductive eddy current coil and the eddy current analysis IC are arranged on a second main body surface of the PCB substrate, wherein the second main body surface is opposite to the first main body surface.

7. The electrical corrosion protection device for motor bearings according to claim 1, characterized in that: The specific functional components include a Hall encoder having a plurality of Hall sensors and a Hall effect analysis IC, wherein the plurality of Hall sensors are distributed at equal intervals along the circumferential direction.

8. The electrical corrosion protection device for motor bearings according to 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 to be located at or close to the radial first side edge end of the PCB substrate, or arranged to be close to the shaft of the motor.

9. The electrical corrosion protection device for motor bearings according to claim 7 or 8, characterized in that: The multiple conductive components are arranged with a plurality of narrow gaps and a plurality of wide gaps between each other along the circumferential direction, so that the conductive components except those located on both sides of the plurality of wide gaps are closely arranged along the circumferential direction, wherein the multiple Hall sensors and / or the eddy current distance sensors are arranged in the plurality of wide gaps, so as to be close to the radial first side edge end of the PCB substrate.

10. The electrical corrosion protection device for motor bearings according to claim 1, characterized in that: The specific functional components include a microphone, a temperature sensor and / or a humidity sensor, and the microphone, the temperature sensor and / or the humidity sensor are arranged in the middle area of ​​the surface of the first body; and / or The specific function component includes a gas or chemical substance sensor configured to detect a predetermined type of volatile substance.

11. The electrical corrosion protection device for motor bearings according to any one of claims 1 to 10, characterized in that: The specific functional components include a communication module, which is electrically connected to all sensors to receive their sensing signals and is used to send the sensing signals to a monitoring terminal.

12. The electrical corrosion protection device for motor bearings according to any one of claims 1 to 10, characterized in that: The electrical corrosion protection device also includes: A wire interface component is arranged in the middle area and is connected with a signal transmission line or a power line for the specific functional component.

13. The electrical corrosion protection device for motor bearings according to any one of claims 1 to 10, characterized in that: The electrical corrosion protection device also includes: A plurality of groups of conductive contact assemblies are provided, each group of conductive contact assemblies comprising a fastening hole and a conductive metal sheet at least partially surrounding the fastening arrangement, thereby forming a substrate conductive contact.

14. The electrical corrosion protection device for motor bearings according to any one of claims 1 to 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. A motor, comprising the electrical corrosion protection device according to any one of claims 1 to 14, wherein: The PCB substrate is fixedly connected to the housing of the motor, and the conductive component directly or indirectly contacts the shaft of the motor to be conductively connected thereto.

16. The electric machine according to claim 15, comprising the electric corrosion protection device according to claim 5 or 6, wherein: The motor further comprises a reflective target plate which is fixedly connected to the shaft of the motor and faces the inductive eddy current coil, and comprises a plurality of metal target sheets arranged in a circumferential direction.

17. The electric machine according to claim 15, comprising the electric corrosion protection device according to claim 7 or 9, wherein: The motor further comprises an induction magnet or a magnetic shaft mounted on the end side of the machine shaft, and the plurality of Hall sensors are arranged on the main body surface of the PCB substrate facing the end side of the machine shaft.

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