Diversion structure and eddy current sensor

Abstract

The utility model relates to the technical field of driving motors and electric driving systems, in particular to a diversion structure and an eddy current sensor, the diversion structure comprises a shell, a capacitor assembly and a diversion body, the shell is provided with an abdicating channel, and the abdicating channel is used for accommodating a rotating shaft of a motor; the capacitor assembly is fixedly arranged on the shell; the current guiding body is fixedly arranged on the shell and electrically connected with the capacitor assembly, the current guiding body is provided with a current guiding end exposed out of the shell, and the current guiding end is located in the receding channel and used for abutting against a rotating shaft of a motor. The utility model aims to provide a flow guide structure and aims to reduce the occurrence probability of electro-corrosion.

Description

TECHNICAL FIELD

[0001] The utility model relates to drive motor and electric drive system technical field, especially relate to a guide structure and electric eddy current sensor. BACKGROUND

[0002] Drive motor is the power source of electric vehicle, and there is potential difference between the rotating shaft of drive motor and the outer ring of bearing in the operation process of converting electric energy into mechanical energy, and then current is generated, and bearing roller oil film is easily broken down when shaft current is too large, thereby bearing electric corrosion problem occurs. And bearing electric corrosion is one of the reasons causing motor operation abnormal sound.

[0003] In the related art, a magnetic ring is usually added at the three-phase line, the shaft current is reduced through filtering, and the electric corrosion of the transmission bearing by the shaft current is reduced or avoided, but the magnetic ring occupies a large space and has high cost. UTILITY MODEL CONTENTS

[0004] The main purpose of the utility model is to provide a guide structure, which aims to reduce the probability of electric corrosion.

[0005] To achieve the above purpose, the guide structure provided by the utility model comprises:

[0006] A shell having a clearance passage for accommodating the rotating shaft of the motor;

[0007] A capacitor assembly fixedly arranged in the shell; and

[0008] A flow guide body fixedly arranged in the shell and electrically connected to the capacitor assembly, the flow guide body having a flow guide end exposed to the shell, the flow guide end being located in the clearance passage and used for abutting against the rotating shaft of the motor.

[0009] In an embodiment of the utility model, the guide structure is provided with a plurality of flow guide bodies, the plurality of flow guide bodies are arranged in parallel, and each flow guide body is arranged in series with the capacitor assembly.

[0010] Among them, a plurality of flow guide bodies are arranged in an array and the array path is circular.

[0011] In an embodiment of the utility model, the shell is provided with a plurality of limiting grooves matched with the flow guide bodies, and the limiting grooves are communicated with the clearance passage.

[0012] In an embodiment of the utility model, the capacitor assembly comprises a first conductive part and a capacitor arranged in sequence and electrically connected, and the flow guide body is arranged on the side of the first conductive part away from the capacitor.

[0013] In an embodiment of the utility model, the capacitor assembly further includes a second conductive part, the second conductive part is arranged on the side of the capacitor opposite to the first conductive part and is electrically connected with the capacitor, and the second conductive part has a current output end.

[0014] In an embodiment of the utility model, the first conductive part and the second conductive part are both copper bar structures.

[0015] In an embodiment of the utility model, a sealing layer is arranged in the shell, and the sealing layer covers the capacitor assembly.

[0016] The utility model provides a kind of eddy current sensor, the eddy current sensor includes eddy current stator and eddy current rotor, the eddy current stator and the eddy current rotor are all used to connect the rotating shaft of motor;

[0017] Wherein, the eddy current stator includes induction circuit board and the flow guide structure, and the induction circuit board is fixedly arranged in the shell.

[0018] In an embodiment of the utility model, the shell has first accommodating cavity and second accommodating cavity, and the first accommodating cavity and the second accommodating cavity are arranged in isolation.

[0019] The induction circuit board is arranged in the first accommodating cavity, and the capacitor assembly and the flow guide body are both arranged in the second accommodating cavity.

[0020] In an embodiment of the utility model, the second accommodating cavity is provided with a magnetic field shielding layer, and the magnetic field shielding layer is coated on the inner cavity wall of the second accommodating cavity.

[0021] In the technical scheme of the utility model, the flow guide structure is applied to motor, the shell can be fixed on the motor shell, and when the rotating shaft on the motor rotates, the capacitor assembly connected with the rotating shaft of motor can reduce the voltage at bearing, reduce the current flowing through bearing, prevent the breakdown of oil film caused by excessive shaft current, and reduce the probability of electric corrosion. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained from the structure shown in these drawings without creative labor.

[0023] Figure 1 The structural schematic diagram of an embodiment of the flow guide structure provided by the utility model is shown in the figure.

[0024] Figure 2 Structure diagram of one embodiment of the shell provided by the utility model;

[0025] Figure 3 For Figure 1 Internal structure diagram.

[0026] Explanation of reference numerals:

[0027] 10, shell; 10a, let go of the passage; 20, capacitor assembly; 21, first conductive part; 22, capacitor; 23, second conductive part; 30, flow guide; 40, induction circuit board; 50, eddy current rotor.

[0028] The implementation, functional features and advantages of the utility model will be further described with reference to the accompanying drawings in conjunction with embodiments. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0030] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0031] In addition, if the embodiments of the utility model involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B schemes are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skill in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0032] Please refer to Figure 1 The flow guide structure provided by the utility model comprises:

[0033] The shell 10 has a space-allowing channel 10a for accommodating the rotating shaft of the motor;

[0034] The capacitor assembly 20 is fixed in the shell 10; and

[0035] The flow guide 30 is fixed in the shell 10 and electrically connected to the capacitor assembly 20, and has a flow guide end exposed to the shell 10, which is located in the space-allowing channel 10a and used for abutting against the rotating shaft of the motor.

[0036] In the technical scheme of the utility model, the flow guide structure is applied to the motor, the shell can be fixed on the motor shell, and when the rotating shaft of the motor rotates, the capacitor assembly connected with the rotating shaft of the motor can reduce the voltage at the bearing, reduce the current flowing through the bearing, prevent the oil film from being broken down by excessive shaft current, and reduce the probability of occurrence of electric corrosion.

[0037] It can be understood that the flow guide structure can be used alone or integrated with other devices such as an eddy current sensor, for example, when integrated with the eddy current sensor, the internal structure layout of the eddy current sensor is changed, the capacitor assembly 20 and the flow guide 30 are fixed on the shell 10 of the eddy current sensor, so that the eddy current sensor simultaneously has the functions of detection and solution of the bearing electric corrosion problem, and the motor does not need to be modified, thereby reducing the use cost.

[0038] The shell 10 can be fixed on the shell of the motor, and the cross-sectional shape thereof can be circular, square, etc., which is not limited herein. The space-allowing channel 10a extending along the axial direction and penetrating through the central region of the shell 10 is mainly used for accommodating the rotating shaft of the motor, so that the flow guide end of the flow guide 30 can abut against the rotating shaft, the shaft current is guided to the capacitor assembly 20, and the cross section of the space-allowing channel 10a can be circular to adapt to the rotating shaft, or can be other shapes, which is not limited herein.

[0039] The capacitor assembly 20 is fixed in the shell 10, and after being connected in parallel with the rotating shaft, the capacitor assembly 20 can reduce the voltage at the bearing by using the voltage division principle, thereby reducing the current flowing through the bearing and avoiding bearing electric corrosion.

[0040] The flow guide 30 is a low-resistance structure capable of passing current, which can be a flow guide carbon brush, and can also be a metal contact piece, a flow guide 30 formed by spraying or electroplating a layer of conductive metal on the surface of a non-conductive material, which is not limited herein; part of the structure of the flow guide 30 is fixed in the shell 10, and has a flow guide end exposed to the shell 10. Specifically, the shell 10 is provided with a limiting channel communicating with the accommodation channel 10a, and part of the structure of the flow guide 30 can pass through the limiting channel to form a flow guide end, so as to be located in the accommodation channel 10a and abut against the rotating shaft of the motor. In this way, the shaft current generated on the motor bearing can be effectively guided to the capacitor assembly 20, so as to prevent the shaft current from being too large to cause the bearing oil film to be broken, thereby reducing the occurrence probability of electric corrosion.

[0041] Further, the flow guide structure is provided with a plurality of flow guides 30, the plurality of flow guides 30 are arranged in parallel, and each flow guide 30 is arranged in series with the capacitor assembly 20. In this way, the parallel arrangement of the plurality of flow guides 30 can significantly improve the flow guide efficiency, reduce the potential damage of the shaft current to the motor, and at the same time ensure that when one of the flow guides 30 fails or wears, the other flow guides 30 can still continue to guide the flow, thereby reducing the influence on the overall performance of the structure; in an embodiment, the cross-sectional shape of the accommodation channel 10a is circular, at this time, the plurality of flow guides 30 are arranged in the circumferential direction of the accommodation channel 10a, and the path formed by the plurality of flow guide ends is circular. In this arrangement, the plurality of flow guides 30 are uniformly distributed around the rotating shaft of the motor, which can provide uniform current flow effect, ensure uniform contact pressure between each flow guide 30 and the rotating shaft, and better adapt to the rotation of the rotating shaft, so that the flow guide 30 is in contact with the rotating shaft at any position; in another embodiment, the cross-sectional shape of the accommodation channel 10a is square, at this time, the path formed by the plurality of flow guide ends is square, which is not limited herein; it can be understood that, according to the internal space layout of the shell 10, the central axes of the plurality of flow guides 30 can not be at the same height, as long as any number of flow guides 30 at different heights jointly form a circumferential array structure.

[0042] In an embodiment of the present application, the shell 10 is provided with a plurality of limiting grooves matched with the flow guides 30, and the limiting grooves communicate with the accommodation channel 10a. Specifically, a plurality of limiting grooves are arranged in the circumferential direction in the shell 10, and each limiting groove has an extension section extending towards the accommodation channel 10a. In this way, the flow guide end of the flow guide 30 directly enters the accommodation channel 10a, thereby reducing the installation difficulty.

[0043] In an embodiment of the utility model, capacitor assembly 20 includes first conductive piece 21 and capacitor 22 that are arranged in turn and are electrically connected, and flow guide 30 is arranged on the side of first conductive piece 21 away from capacitor 22, in an embodiment, a plurality of flow guides 30 are all connected in series with first conductive piece 21, and under the confluence of first conductive piece 21, shaft current can enter capacitor 22, in another embodiment, capacitor assembly 20 can include a plurality of sub capacitor assemblies 20, each sub capacitor assembly 20 includes a first conductive piece 21 and a capacitor 22, the first conductive piece 21 and the capacitor 22 of each sub capacitor assembly 20 are connected in series, each first conductive piece 21 is connected with a flow guide 30, and the sub capacitor assemblies 20 are connected in parallel, in this way, each sub capacitor assembly 20 can independently process a part of shaft current, even if one sub capacitor assembly 20 fails, other assemblies can still work normally, and the voltage division capability is ensured.

[0044] Further, capacitor assembly 20 further includes second conductive piece 23, second conductive piece 23 is arranged on the side of capacitor 22 away from first conductive piece 21 and is electrically connected with capacitor 22, second conductive piece 23 has a current output end, the current output end can lead out the current in capacitor assembly 20, for connecting to other circuits or ground, in this way, first conductive piece 21 and second conductive piece 23 and capacitor 22 jointly constitute a complete current path, allowing shaft current to flow from flow guide 30, pass through capacitor 22, and then flow out from the current output end of second conductive piece 23.

[0045] In an embodiment of the utility model, first conductive piece 21 and second conductive piece 23 are both copper bar structures, based on the laminated arrangement, by using the copper bar structure with thinner thickness, compact design is helpful, and space occupation is reduced

[0046] Further, the shell 10 is provided with a sealing layer, the sealing layer covers the capacitor assembly 20, by arranging the sealing layer, the capacitor assembly 20 can reduce the adsorption of dust and other particles, and the irreversible negative influence of moisture invasion on the electrical performance of the capacitor assembly 20 and the flow guide 30 is avoided.

[0047] The utility model provides a kind of eddy current sensor, and the eddy current sensor includes eddy current stator and eddy current rotor 50, eddy current stator is configured as the fixed connection shell of motor, and eddy current rotor 50 is configured as the fixed connection shaft of motor;

[0048] Wherein, the eddy current stator includes induction circuit board 40 and flow guide structure, and the induction circuit board 40 is fixedly arranged in the shell 10.

[0049] The electric eddy current rotor 50 is fixedly installed on the rotating shaft of the motor and rotates synchronously with the rotating shaft, the electric eddy current stator is fixedly installed on the shell 10 of the motor, the induction circuit board 40 of the electric eddy current stator is provided with a chip and a circuit, and is used in cooperation with the electric eddy current rotor 50, is responsible for processing, identifying and feeding back the rotor position, meanwhile, the electric eddy current stator further comprises the above-mentioned flow guide structure, so that the electric eddy current sensor simultaneously has the detection induction function and solves the problem of bearing electric corrosion, and can enrich the function of the electric eddy current sensor without modifying the motor.

[0050] Further, the shell 10 has a first accommodating cavity and a second accommodating cavity, the first accommodating cavity and the second accommodating cavity are arranged in isolation, the induction circuit board 40 is arranged in the first accommodating cavity, and the capacitor assembly 20 and the flow guide body 30 are arranged in the second accommodating cavity, so that the induction circuit board 40 and the flow guide structure are arranged in isolation, the induction circuit board 40 can be prevented from being affected by current in the flow guide structure, signal clarity can be maintained, electromagnetic interference can be avoided, meanwhile, the isolation arrangement makes the installation and maintenance of the induction circuit board 40 and the flow guide structure more convenient, and for heat management, the isolation arrangement helps to better manage the heat of different circuits and prevent overheating from affecting the performance of the sensor.

[0051] In an embodiment of the present application, the second accommodating cavity is provided with a magnetic field shielding layer, the magnetic field shielding layer is coated on the inner cavity wall of the second accommodating cavity, the magnetic field shielding layer is coated in the second accommodating cavity, so that the electric eddy current sensor can maintain high performance and stability in a complex and changeable working environment, and the applicability of the sensor in precise measurement and control applications can be improved.

[0052] The above is only an exemplary embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the present application.

Claims

1. A flow guiding structure, characterized in that, The flow guide structure comprises: a shell (10) having a space allowing passage (10a); a capacitor assembly (20) fixedly arranged in the shell (10); and a flow guide body (30) fixedly arranged in the shell (10) and electrically connected to the capacitor assembly (20), the flow guide body (30) having a flow guide end exposed to the shell (10), the flow guide end being located in the space allowing passage (10a).

2. The flow guide structure of claim 1, wherein, The flow guide structure is provided with a plurality of flow guide bodies (30) connected in parallel, each of the flow guide bodies (30) being connected in series with the capacitor assembly (20); wherein the plurality of flow guide bodies (30) are arranged in a circumferential direction of the space allowing passage (10a).

3. The flow guide structure of claim 2, wherein, The shell (10) is provided with a plurality of limiting grooves adapted to the flow guide bodies (30), the limiting grooves being communicated with the space allowing passage (10a).

4. The flow guide structure of claim 1, wherein, The capacitor assembly (20) comprises a first conductive member (21) and a capacitor (22) arranged in sequence and electrically connected, the flow guide body (30) being arranged on a side of the first conductive member (21) away from the capacitor (22).

5. The flow guide structure of claim 4, wherein, The capacitor assembly (20) further comprises a second conductive member (23) arranged on a side of the capacitor (22) away from the first conductive member (21) and electrically connected to the capacitor (22); the second conductive member (23) has a current output end.

6. The flow guide structure of claim 5, wherein, The first conductive member (21) and the second conductive member (23) are both copper bar structures.

7. A flow directing structure as claimed in any one of claims 1 to 6, wherein, The shell (10) is provided with a sealing layer, the sealing layer covering the capacitor assembly (20).

8. An eddy current sensor, characterized by The eddy current sensor comprises an eddy current stator and an eddy current rotor (50), the eddy current stator is configured to be fixedly connected to a housing of a motor, the eddy current rotor (50) is configured to be fixedly connected to a rotating shaft of the motor; wherein the eddy current stator comprises an induction circuit board (40) and the flow guide structure according to any one of claims 1 to 7, the induction circuit board (40) is fixedly arranged in the shell (10).

9. The eddy current sensor of claim 8, wherein, The shell (10) has a first accommodating cavity and a second accommodating cavity, the first accommodating cavity and the second accommodating cavity are arranged in isolation; The induction circuit board (40) is arranged in the first accommodating cavity, the capacitor assembly (20) and the flow guide body (30) are both arranged in the second accommodating cavity.

10. The eddy current sensor of claim 9, wherein, The second accommodating cavity is provided with a magnetic field shielding layer, the magnetic field shielding layer is coated on an inner cavity wall of the second accommodating cavity.

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