Self-liquid-storing low-speed elastic-sliding high-speed oil-film contact current collector for high-speed motor rotor

Abstract

The present invention discloses a self-liquid-storing low-speed elastic-sliding and high-speed oil-film contact electrical conductor for a high-speed motor rotor, which includes an annular liquid-conducting and reflux groove bearing that is electromechanically connected to the grounded housing of the motor, a porous ring that is electromechanically connected to the rotor, a conductive lubricating liquid stored in the pores of the porous ring by capillary suction, and a plurality of single-ended fixed spring pieces with variable curvature that are fixedly connected to the bearing or the porous ring. When the electrical conductor rotates at a low speed, it conducts electricity through the elastic sliding contact of the metal spring pieces. When it rotates at a high speed, the conductive liquid inertia-thrown out from the porous ring forms a conductive oil film with hydrodynamic lubrication on the metal spring pieces to generate non-metal direct-contact conduction, realizing low-speed elastic-sliding and high-speed oil-film contact conduction, short-circuiting the common-mode charges on the motor rotor to the grounded housing, and solving the problem that the raceways and rolling element surfaces of the main bearings of the motor fail due to frequent discharge corrosion.

Description

Technical Field

[0001] The present invention relates to the field of electromechanical technology, and particularly to a self-liquid-storing low-speed elastic-sliding high-speed oil-film contact electrical conductor for a high-speed motor rotor. Background Art

[0002] In a variable-frequency speed-regulation motor, due to the incomplete balance between multiple phase windings of the stator, charges will gradually accumulate on the rotor during the operation of the multi-phase motor, forming a common-mode voltage. When the common-mode voltage increases to a certain value, it will break down the lubricating oil film between the rolling elements and the raceway in the main bearing of the motor to form an electrical circuit, releasing the accumulated charges to the grounded motor housing. Since the contact surfaces of the rolling elements and the raceway in the main bearing are very small, the current density will be very large, and frequent discharges will cause local melting of the contact area of the main bearing, resulting in electro-corrosion failure. The existing technical methods to solve this problem mainly involve insulation and conduction.

[0003] Insulation measures mainly involve insulating the relevant surfaces of the main bearing or using insulating bearings. General insulating bearings such as ceramic bearings have a high cost. If the bearing assembly surface is insulated, the insulating layer is extremely easy to be damaged during the assembly of the bearing. Insulating the main bearing of the motor will cause the common-mode charges to shunt to the low-resistance external connecting shaft of the motor, resulting in electro-corrosion of the bearing supporting the external connecting shaft. Therefore, insulating all the supporting bearings is required for insulating the bearing, which further increases the cost.

[0004] The commonly used conduction method is to install a conduction device (such as a conduction brush, a conduction ring, etc.) to short-circuit the common-mode charges on the rotor to the grounded motor housing. However, such devices are currently mainly contact-type and are prone to wear and failure at high speeds, and need to be replaced frequently. Currently, the lifespan of the contact-type conduction ring on the market is approximately 200 million to 500 million revolutions, which can meet the lifespan requirements for conventional low-speed motors. However, with the high-speed development of mechanical equipment, for example, the operating speed of the motor in new energy vehicles has reached about 20,000 r / min, and the contact-type conduction ring can no longer meet its requirements. Although there is currently a conduction ring using mercury as the conduction medium on the market, due to the toxicity and volatility of mercury, good sealing is required, the structure is complex, and its operating speed is only about 3,000 r / min.

[0005] Tesla Corporation has announced a method for discharging the rotor by using a discharge rolling bearing on the motor shaft. For details, see patent application CN109314445A. The discharge rolling bearing in this method requires a smaller structure and resistance than the main bearing, so that the current is conducted to the housing through the discharge rolling bearing. However, this method requires sacrificing the discharge rolling bearing to avoid the failure of the main bearing of the motor, and at the same time, the discharge rolling bearing requires a special conductive grease. Summary of the Invention

[0006] In view of the above defects of the prior art, the technical problem to be solved by the present invention is that the electrical corrosion failure of the main bearings of existing high-speed motors is serious. Therefore, the insulation measures adopted in the prior art to solve the problem of electrical corrosion failure are very costly, while the conductive methods adopted are mainly contact-type, which are not applicable to high-speed motors or require sacrificing the discharge rolling bearings to avoid the failure of the main bearings of the motors. Therefore, the present invention provides a self-liquid-storing low-speed elastic-sliding high-speed oil-film contact type electrical conductor for a high-speed motor rotor, which conducts electricity through elastic sliding contact of metal spring pieces at low speeds, and at high speeds, uses the conductive liquid ejected by inertia from the porous ring to form a conductive oil film with hydrodynamic lubrication on the metal spring pieces to generate non-direct contact conduction, thereby realizing low-speed elastic-sliding high-speed oil-film contact conduction and short-circuiting the common-mode charges on the rotating shaft to the grounded housing.

[0007] To achieve the above object, the self-liquid-storing low-speed elastic-sliding high-speed oil-film contact type electrical conductor provided by the present invention is installed at the non-output end of the rotating shaft of a variable-frequency speed-regulating motor; at low speeds, the electrical conductor conducts electricity through elastic sliding contact of metal spring pieces, and at high speeds, it uses the conductive liquid ejected by inertia from the porous ring to form a conductive oil film with hydrodynamic lubrication on the metal spring pieces to generate non-metal direct contact conduction.

[0008] Further, the electrical conductor includes an annular liquid-guide reflux groove bearing, a porous ring, a conductive liquid, and a plurality of metal spring pieces. The annular liquid-guide reflux groove bearing is electrically connected to the motor rear end cover, the porous ring is electrically connected to the rotating shaft, the porous ring is electrically connected to the rotating shaft, and the metal spring pieces are connected to the porous ring or the annular liquid-guide reflux groove bearing; the porous ring is made of porous metal material, and uses the adsorption property of the porous material to store the conductive liquid in its internal pores under the action of capillary force; the metal spring pieces are arranged along the circumferential direction in the gap cavity formed by the porous ring and the annular liquid-guide reflux groove bearing, and under the action of elastic force, the metal spring pieces are tangent to the porous ring or the annular liquid-guide reflux groove bearing to form a double-wedge gap, and a conductive oil film with hydrodynamic lubrication is formed during high-speed forward and reverse rotation.

[0009] Further, the electrical conductor includes a radial grounding electrical conductor and an axial grounding electrical conductor.

[0010] Further, the radial grounding electrical conductor is fixed to the non-output end of the rotating shaft through an end cover of the shaft, the porous ring is arranged as a hollow cylindrical structure, and forms a gap cavity with the annular liquid-guide reflux groove bearing in the radial direction. The metal spring pieces are arranged along the circumferential direction of the gap cavity formed by the porous ring and the annular liquid-guide reflux groove bearing, and a double-wedge gap is formed between the metal spring pieces and the bottom circle of the annular liquid-guide reflux groove bearing or the outer circle of the porous ring.

[0011] Further, one end of the metal spring piece is fixed to the bottom circle of the annular liquid guiding and refluxing groove bearing, and is in tangential contact with the outer circle of the porous ring under the action of elastic force, and a two-way wedge-shaped gap is formed between the metal spring piece and the outer circle of the porous ring. Both end faces of the porous ring are provided with inclined edge guards for axial positioning between the porous ring and the annular liquid guiding and refluxing groove bearing.

[0012] Further, the metal spring piece is arranged such that one end is fixed to the outer circle of the porous ring, and is in tangential contact with the bottom circle of the annular liquid guiding and refluxing groove bearing under the action of elastic force, and a two-way wedge-shaped gap is formed between the metal spring piece and the bottom circle of the annular liquid guiding and refluxing groove bearing; a chamfer transition is adopted for the inner circle and the side surface of the annular liquid guiding and refluxing groove bearing for axial positioning between the porous ring and the annular liquid guiding and refluxing groove bearing.

[0013] Further, the axial grounding electrical conductor is installed at the non-output end of the rotating shaft. The porous ring is arranged as a hollow frustum structure, and the annular liquid guiding and refluxing groove bearing is a disc structure with an annular groove, forming a small gap cavity in the axial direction with the porous ring. The porous ring and the annular liquid guiding and refluxing groove bearing are axially and radially positioned by a metal spring piece; the annular liquid guiding and refluxing groove bearing is fixed to the rear end cover; the metal lying spring piece is in tangential contact with the end face of the porous ring or the bottom of the groove of the annular liquid guiding and refluxing groove bearing.

[0014] Further, one end of the metal spring piece is fixed to the bottom of the groove of the annular liquid guiding and refluxing groove bearing, and is in tangential contact with the end face of the porous ring under the action of elastic force, and the frustum end face of the porous ring is provided with an inclined edge guard for radial positioning between the porous ring and the annular liquid guiding and refluxing groove bearing.

[0015] Further, one end of the metal spring piece is fixed to the frustum end face of the porous ring, and is in tangential contact with the bottom of the groove of the annular liquid guiding and refluxing groove bearing under the action of elastic force. A chamfer transition is adopted for the outer side and the bottom circle of the groove of the annular liquid guiding and refluxing groove bearing for radial positioning between the porous ring and the annular liquid guiding and refluxing groove bearing.

[0016] Further, the metal spring piece is a flat strip or a variable curvature asymmetric structure, the number of metal spring pieces is two or more, and the metal spring pieces are arranged to overlap each other or not interfere with each other.

[0017] Technical effects

[0018] The self-liquid-storing low-speed elastic-sliding high-speed oil film contact electrical conductor for the high-speed motor rotor of the present invention can effectively ground during positive and negative rotations in the full speed range (low speed, medium speed, high speed), and its conductivity is much higher than the rolling contact conductivity of the main support rolling bearing, which can achieve discharge protection for the main bearing of the high-speed motor rotor and avoid the problem of electrical corrosion failure caused by frequent contact discharge between the raceway and the rolling element surface of the main bearing.

[0019] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, features and effects of the present invention. Description of the Drawings

[0020] Figure 1 is a schematic diagram of the basic structure of a high-speed variable-frequency motor;

[0021] Figure 2 is a schematic diagram of the radial electrical conductor of a self-liquid-storing low-speed elastic-sliding high-speed oil film contact electrical conductor for the high-speed motor rotor of a preferred embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the radial electrical conductor of a self-liquid-storing low-speed elastic-sliding high-speed oil film contact electrical conductor for the high-speed motor rotor of another preferred embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of the axial electrical conductor of a self-liquid-storing low-speed elastic-sliding high-speed oil film contact electrical conductor for the high-speed motor rotor of a preferred embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of the axial electrical conductor of a self-liquid-storing low-speed elastic-sliding high-speed oil film contact electrical conductor for the high-speed motor rotor of another preferred embodiment of the present invention;

[0025] Figure 6 is a design diagram of the hydrodynamic pressure distribution on the metal spring sheet of a self-liquid-storing low-speed elastic-sliding high-speed oil film contact electrical conductor for the high-speed motor rotor of a preferred embodiment of the present invention. Detailed Embodiments

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] In the following description, specific details such as specific internal programs and technologies are set forth for the purpose of illustration and not limitation, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0028] Such as Figure 1As shown in the figure, a conventional high-speed variable-frequency motor includes a housing 1, a front end cover 3, a rear end cover 8, a rotating shaft 5 with a rotor 6, a stator 2, and metal rolling bearings 4 and 9 for supporting the rotor. The stator 2 is fixed inside the housing 1 and is concentric with the rotating shaft 2. The rotating shaft 5 with the rotor 6 is rotationally supported by the metal rolling bearings 4 and 9 and is respectively coupled to the front end cover 3 and the rear end cover 8 of the motor. The front end cover 3 and the rear end cover 8 are fixed to the grounded housing 1 by threaded connection or other electromechanical connections. Due to the incomplete balance between the multiple phase windings of the stator 2, common-mode charges 7 accumulate on the rotating shaft 5, forming a common-mode voltage.

[0029] When no insulation treatment and conductive device are installed, when the common-mode voltage increases to a certain value, it will break down the lubricating oil film in the metal rolling bearings 4 and 9 in the motor to form a circuit and discharge to the grounded motor housing 1. Since the contact area between the steel balls / rollers and the raceways in the rolling bearings is very small, the current density is large, causing local melting of the metal rolling bearings 4 and 9, resulting in failure. When a conductive device is installed, the charges 7 on the rotating shaft 5 can be discharged to the grounded housing 1 through the electrical conductor 100. However, since the existing conductive devices are usually contact-type, they are prone to wear and failure at high speeds, require frequent replacement, and cannot meet high speeds. In addition to Figure 1 the basic components of the motor given in, it may also include multiple other additional combined structures and features, drive electronics, etc. Although Figure 1 the motor only has two metal rolling bearings for support, the rotors of motors with different functions can be supported by multiple rolling bearings of different models.

[0030] Therefore, to address the above problems, the present invention will describe the shunting of the common-mode charges 7 on the rotor 5 of the motor to the grounded motor housing 1 or other grounded charge-receiving devices in combination with embodiments. The structures and solutions described in the present invention are applicable to the discharge protection of the rotors in motors in different industries (such as automobiles, wind power generation, airplanes, ships, trains, etc.).

[0031] Such as Figure 1As shown, the self-liquid storage low-speed elastic sliding high-speed oil film contact type conductor 100 for the high-speed motor rotor of the present invention is installed at the non-output end of the rotating shaft 5, and the conductor 100 includes an annular liquid-conducting reflux groove bearing 102, a porous ring 101, a conductive liquid 104 and a plurality of metal spring sheets 103, wherein the annular liquid-conducting reflux groove bearing 102 is electromechanically connected to the rear end cover 8 of the motor, the porous ring 101 is electromechanically connected to the rotating shaft 5, the conductive liquid 104 is stored in the pores of the porous ring 101 by capillary suction, and a plurality of metal spring sheets 103 fixed at one end are connected to the porous ring 101 or the annular liquid-conducting reflux groove bearing 102. When the conductor 100 rotates at a low speed, the metal spring sheet 103 elastically slides in contact to conduct electricity, and when the conductor 100 rotates at a high speed, the conductive liquid 104 inertially thrown out from the porous ring 101 forms a conductive oil film lubricated by fluid dynamic pressure between the metal spring sheet 103 and the annular liquid-conducting reflux groove bearing 102 to generate non-metallic direct contact conduction.

[0032] Embodiment 1

[0033] like Figure 2 As shown, this embodiment provides a radial grounding conductor. In this embodiment, a porous ring 101 is interference-fitted on the end of the rotating shaft 5 and is axially fixed by the shaft shoulder of the rotating shaft 5 and the shaft end cover 11. The annular liquid guide reflux groove bearing 102 is fixed on the rear end cover 8 of the motor and is axially fixed by the annular end cover 10. The porous ring 101 is a hollow cylindrical structure. The part close to the inner circle is made of non-porous or small-pore metal material, and the part close to the outer circle is made of porous metal material. The end face close to the outer circle is covered with a sealing layer 105 to prevent the conductive liquid 104 from flowing out from the end face. The porous ring 101 forms a gap cavity with the annular liquid guide reflux groove bearing 102 in the radial direction and the end face direction, and has a dynamic sealing structure in the end face direction to prevent the conductive liquid 104 from leaking. The metal spring sheet 103 is arranged along the circumferential direction of the gap cavity formed by the porous ring 101 and the annular liquid-conducting reflux groove bearing 102, and one end is fixed to the bottom circle of the annular liquid-conducting reflux groove bearing by welding or other fixing methods, and is tangentially contacted with the outer circle of the porous ring 101 under the action of elastic force. At this time, the metal spring sheet 103 forms a bidirectional wedge-shaped gap with the outer circle of the porous ring 101 to form a flowing dynamic pressure conductive oil film during high-speed forward and reverse rotation. The two end surfaces of the porous ring 101 are provided with beveled ribs to facilitate axial positioning between the porous ring 101 and the annular liquid-conducting reflux groove bearing 102. The metal spring sheets 103 can be connected to each other and distributed, such as Figure 2 (a) shows that they can also be distributed without interfering with each other, such as Figure 2 (b) as shown.

[0034] When the rotating shaft 5 rotates at high speed, under the action of inertial centrifugal force, the conductive liquid 104 stored in the porous ring 101 is thrown towards the clearance cavity formed by the porous ring 101 and the annular liquid guiding and reflux groove bearing 102. A hydrodynamic lubricating conductive oil film can be formed on the contact pair between the metal spring piece 103 and the porous ring 101 by using a wedge-shaped gap, realizing the low-resistance conduction between the porous ring 101 and the annular liquid guiding and reflux groove bearing 102, and short-circuiting the common-mode charge 7 on the rotating shaft 5 to the grounded housing 1, playing a role in discharging and protecting the rotor, and avoiding the failure of the metal rolling bearings 4 and 9 supporting the rotor due to electro-corrosion problems. Since the two-way wedge-shaped gap is formed between the outer circle of the metal spring piece 103 and the porous ring 101, an effective flowing hydrodynamic conductive oil film can be formed during both high-speed forward and reverse rotations. When the rotating shaft 5 stops rotating or rotates at a low speed, the thrown conductive liquid 104 is sucked back under the capillary force of the porous ring 101 and stored in its internal pores, while the metal spring piece 103 elastically slides into direct contact with the porous ring 101 or the annular liquid guiding and reflux groove bearing 102 under the action of elastic force, realizing the low-resistance conduction between the porous ring 101 and the annular liquid guiding and reflux groove bearing 102, thereby short-circuiting the common-mode charge 7 to the grounded housing 1 or other grounded charge receiving devices.

[0035] Embodiment 2

[0036] As Figure 3 shown, this embodiment provides another radial grounding conductor. The difference between the radial grounding conductor in this embodiment and that in Embodiment 1 is that one end of the metal spring piece 103 is fixed to the outer circle of the porous ring 101 by welding or other fixing methods, and is in tangential contact with the bottom circle of the annular liquid guiding and reflux groove bearing 102 under the action of elastic force. At this time, a two-way wedge-shaped gap is formed between the bottom circle of the metal spring piece 103 and the annular liquid guiding and reflux groove bearing 102, so as to form a flowing hydrodynamic conductive oil film during high-speed forward and reverse rotations. The inner circle and the side surface of the annular liquid guiding and reflux groove bearing 102 adopt a chamfer transition for the axial positioning between the porous ring 101 and the annular liquid guiding and reflux groove bearing 102. A sealing layer may not be used on the end face of the porous ring 101 near the outer circle, but a sealing layer 105 is covered on the outer circle surface of the porous ring 101 corresponding to the metal spring piece 103 to prevent the conductive liquid 104 from being thrown out from this position and forming an additional force on the metal spring piece. When the clearance cavity formed by the porous ring 101 and the annular liquid guiding and reflux groove bearing 102 is not filled with the conductive liquid 104, due to the action of centrifugal force, the conductive liquid is thrown onto the bottom circle surface of the annular liquid guiding and reflux groove bearing 102, and it can still lubricate the contact pair between the metal spring piece 103 and the annular liquid guiding and reflux groove bearing 102 to form a conductive oil film. Therefore, this embodiment can also short-circuit the common-mode charge 7 on the rotating shaft 5 to the grounded housing 1 or other grounded charge receiving devices when the clearance cavity is not filled with the conductive liquid 104.

[0037] Example 3

[0038] As Figure 4 shown, this embodiment provides an axial grounding electrical conductor. In this embodiment, the annular liquid guiding and refluxing groove bearing 102 is a disc structure with an annular groove, and at the same time forms a tiny clearance cavity with the porous ring 101 in the axial direction. A sealing layer 105 is covered on the non-contact surface between the porous ring 101 and the annular liquid guiding and refluxing groove bearing 102, so that the conductive liquid 104 stored in the pores inside the porous ring can only flow out from the end face under the action of inertial centrifugal force. The porous ring 101 and the annular liquid guiding and refluxing groove bearing 102 are axially positioned by a metal spring piece 103. The annular liquid guiding and refluxing groove bearing 102 is fixed to the rear end cover 9 of the motor by threads or other electromechanical connections. The outer side of the groove of the annular liquid guiding and refluxing groove bearing 102 adopts a dynamic sealing structure to prevent the conductive liquid 104 from leaking during operation, and the inner side surface adopts an inclined surface so that the conductive liquid 104 can flow back and be absorbed by the porous ring. One end of the metal spring piece 103 is fixed to the bottom of the groove of the annular liquid guiding and refluxing groove bearing 102 by welding or other fixing methods, and tangentially contacts the end face of the porous ring 101 under the action of elastic force. And the conical end face of the porous ring 101 is provided with an inclined surface edge to facilitate the radial positioning between the porous ring 101 and the annular liquid guiding and refluxing groove bearing 102.

[0039] When the rotating shaft 5 rotates at a high speed, it drives the porous ring 101 to rotate at a high speed, so that the conductive liquid 104 stored in the porous ring 101 can only flow out from the end face under the action of inertial centrifugal force and fill the clearance between the porous ring 101 and the annular liquid guiding and refluxing groove bearing 102. A hydrodynamic lubricating conductive oil film can be formed by using a wedge-shaped clearance on the contact pair between the metal spring piece 103 and the porous ring 101 to achieve low-resistance conduction between the porous ring 101 and the annular liquid guiding and refluxing groove bearing 102. When the rotating shaft 5 stops rotating or rotates at a low speed, like in Example 1, the ejected conductive liquid 104 is sucked back and stored in the micropores inside the porous ring 101 under the adsorption force of the porous ring 101, and the metal spring piece 103 is in direct contact with the porous ring 101 and the annular liquid guiding and refluxing groove bearing 102 under the action of elastic force to achieve low-resistance conduction between the porous ring 101 and the annular liquid guiding and refluxing groove bearing 102.

[0040] Example 4

[0041] As Figure 5As shown in the figure, this embodiment provides another axial grounding electrical conductor. The difference between the axial grounding electrical conductor in this embodiment and that in the third embodiment is that one end of the metal spring piece 103 is fixed to the frustum end face of the porous ring 101 by welding or other fixing methods, and tangentially contacts the bottom of the groove of the annular liquid guiding and reflux groove bearing 102 under the action of elastic force. The outer side and bottom circle of the groove of the annular liquid guiding and reflux groove bearing 101 adopt chamfer transitions for radial positioning between the porous ring 101 and the annular liquid guiding and reflux groove bearing 102. Similar to the second embodiment, this embodiment can also short-circuit the common-mode charge 7 on the rotating shaft 5 to the housing 1 or other ground receiving charge devices when the conductive liquid 104 does not fill the clearance cavity at high speed.

[0042] In the first to fourth embodiments, in order to form an effective conductive oil film at high speed, the wedge-shaped clearance between the metal spring piece and the porous ring 101 or the annular liquid guiding groove bearing 102 can be designed, that is, by adjusting the curvature and arc length of the metal spring piece 103, the direction of the resultant force of the hydrodynamic pressure formed is made to deviate as much as possible towards the non-fixed end of the metal spring piece, as Figure 6 shown.

[0043] The electrical conductor of the present invention can effectively ground during forward and reverse rotations in the full speed range (low speed, medium speed, high speed), and its conductivity is much higher than the rolling contact conductivity of the main support rolling bearing, which can discharge and protect the main bearing of the high-speed motor rotor, avoiding the problem of electrical corrosion failure caused by frequent contact discharge between the raceway and the rolling element surface of the main bearing. Using non-contact conduction of the conductive oil film at high speed can effectively extend the service life of the electrical conductor.

[0044] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A self-liquid-storing low-speed elastic-sliding high-speed oil-film contact electrical conductor for a high-speed motor rotor, characterized in that, The conductor is installed at the non-output end of the variable frequency speed regulating motor shaft; the conductor conducts electricity through elastic sliding contact of the metal spring sheet at low speed, and uses the conductive liquid inertially thrown out from the porous ring to form a fluid dynamic pressure lubricated conductive oil film on the metal spring sheet at high speed to generate non-metallic direct contact conduction, so as to achieve low-speed elastic sliding and high-speed oil film contact conduction; the conductor includes an annular liquid guide reflux groove bearing, a porous ring, a conductive liquid and a plurality of metal spring sheets; the annular liquid guide reflux groove bearing is electromechanically connected to the rear end cover of the motor, and the porous ring is electromechanically connected to the rotating shaft, The metal spring sheet is connected to the porous ring or the annular liquid-conducting reflux groove bearing; the porous ring is made of a porous metal material, and utilizes the adsorption of the porous material to store the conductive liquid in its internal pores under the action of capillary force; the metal spring sheet is arranged along the circumferential direction in the gap cavity formed by the porous ring and the annular liquid-conducting reflux groove bearing, and under the action of elastic force, the metal spring sheet is in tangential contact with the porous ring or the annular liquid-conducting reflux groove bearing and forms a bidirectional wedge-shaped gap, thereby forming a conductive oil film for fluid dynamic lubrication during high-speed forward and reverse rotation.

2. The self-liquid-storing low-speed elastic-sliding high-speed oil film contact type electrical conductor for a high-speed motor rotor according to claim 1, characterized in that, The electrical conductors are arranged to include radial grounding conductors and axial grounding conductors.

3. The self-liquid-storing low-speed elastic-sliding high-speed oil film contact electrical conductor for a high-speed motor rotor according to claim 2, wherein, The radial grounding conductor is fixed to the non-output end of the rotating shaft through a shaft end cover, and the porous ring is configured as a hollow cylindrical structure to form a gap cavity with the annular liquid guide reflux groove bearing in the radial direction.

4. The self-accumulating liquid low-speed elastic-sliding high-speed oil film contact electrical conductor for a high-speed motor rotor according to claim 3, characterized in that, One end of the metal spring sheet is fixed to the bottom circle of the annular liquid guide reflux groove bearing and is in tangential contact with the outer circle of the porous ring under the action of elastic force. The two end surfaces of the porous ring are provided with beveled ribs for axial positioning between the porous ring and the annular liquid guide reflux groove bearing.

5. The self-liquid-storing low-speed elastic-sliding high-speed oil film contact type current collector for a high-speed motor rotor according to claim 3, characterized in that, One end of the metal spring sheet is fixed on the outer circle of the porous ring and is in tangential contact with the bottom circle of the annular liquid-conducting reflux groove bearing under the action of elastic force; the inner circle and the side surface of the annular liquid-conducting reflux groove bearing adopt chamfered transition, which is used for axial positioning between the porous ring and the annular liquid-conducting reflux groove bearing.

6. The self-liquid-storing low-speed elastic-sliding high-speed oil film contact type current collector for a high-speed motor rotor according to claim 2, wherein, The axial grounding conductor is installed at the non-output end of the rotating shaft, the porous ring is a hollow truncated cone structure, the annular liquid guide reflux groove bearing is a disc structure with an annular groove, and forms a tiny gap cavity with the porous ring in the axial direction, and the porous ring and the annular liquid guide reflux groove bearing are axially and radially positioned by the metal spring sheet; the annular liquid guide reflux groove bearing is fixed to the rear end cover; the metal spring sheet is in tangential contact with the end face of the porous ring or the bottom of the groove of the annular liquid guide reflux groove bearing.

7. The self-liquid-storing low-speed elastic-sliding high-speed oil film contact electrical conductor for a high-speed motor rotor according to claim 6, characterized in that, One end of the metal spring sheet is fixed to the bottom of the groove of the annular liquid guide reflux groove bearing, and is in tangential contact with the end face of the porous ring under the action of elastic force, and the truncated cone end face of the porous ring is provided with a bevel rib to facilitate radial positioning between the porous ring and the annular liquid guide reflux groove bearing.

8. The self-liquid-storing low-speed elastic-sliding high-speed oil-film contact electrical conductor for a high-speed motor rotor according to claim 6, characterized in that, One end of the metal spring piece is fixed on the frustum end face of the porous ring and is in tangential contact with the bottom of the groove of the annular liquid guiding and reflux groove bearing under the action of elastic force. The outer side and the bottom circle of the groove of the annular liquid guiding and reflux groove bearing are chamfered to facilitate the radial positioning between the porous ring and the annular liquid guiding and reflux groove bearing.

9. The self-liquid-storing low-speed elastic-sliding high-speed oil-film contact type current collector for a high-speed motor rotor according to any one of claims 3-8, characterized in that, The metal spring piece is in a planar strip shape or a variable curvature asymmetric structure. The number of the metal spring pieces is two or more, and the metal spring pieces are arranged to be overlapped with each other or non-interfering with each other.

Images