A simulation device for the shaft current damage of the insulation bearing of a rail transit traction motor

Abstract

The invention discloses a simulation device for the shaft current damage of the insulated bearing of a rail transit traction motor, comprising a bearing, a main shaft, a hollow shaft, a bearing support, a bearing chuck, a bottom plate, a vibration and impact loading device, an insulation coating failure device, a current loading device, a first motor and a second motor; the vibration and impact loading device, the bearing support, the insulation coating failure device, the first motor and the second motor are mounted on the bottom plate; one end of the main shaft is connected to the output shaft of the first motor; the hollow shaft is provided with a bearing chuck toward the end of the first motor, and the other end is connected to the second motor; the other end of the main shaft is supported in the bearing chuck by a bearing I, and the hollow shaft is coaxial with the main shaft. The invention can dynamically simulate the vibration and impact working conditions of the insulated bearing of the traction motor and the damage of the shaft current, revealing the influence mechanism of vibration and impact on the degradation of the insulation performance of the bearing, and providing help for improving the quality and life of the insulated bearing.

Description

Technical Field

[0001] The invention relates to a device for simulating shaft current damage of an insulating bearing of a rail transit traction motor. Background Art

[0002] When rail transit vehicles such as subways and EMUs are working, traction motors are usually used to provide power. The traction motor includes a rotating shaft and an insulating bearing. The rotating shaft cooperates with the inner ring of the insulating bearing, and the bearing plays the role of supporting the rotating shaft. Factors such as the working environment of the traction motor on the locomotive and EMU and the rotation speed of the traction motor shaft will affect the structural stability and service life of the bearing. Once the structure and stability of the bearing are damaged, the problem of internal bearing shaft current will increase significantly. At present, bearing shaft current damage has become the main source of generator bearing damage, making the bearing the most vulnerable component inside the rail transit traction motor. Its operating working environment is harsh and the load conditions are complex. As a key basic component in the manufacturing of various equipment, its quality directly determines the performance, reliability and life of the equipment.

[0003] This design is a device for simulating shaft current damage of insulated bearings of traction motors. It studies the source of shaft current and how to accurately measure shaft current generated during motor operation, especially the damage caused to the motor by shaft current generated by the motor in a vibration and impact environment. Therefore, the present invention aims at the formation of shaft current and the damage to insulated bearings caused by vibration and impact environments, and specially invents a shaft current damage simulation device for insulated bearings of rail transit traction motors, which conveniently simulates the generation process of shaft current under load, and provides an experimental basis for studying the fault characteristics of insulated bearings of motors. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a rail transit traction motor insulating bearing shaft current damage simulation device which has a simple structure, stable amplitude, low noise, a large vibration frequency range, can simulate the vibration and impact conditions of the traction motor insulating bearing, and can simulate the damage of the shaft current.

[0005] The technical solution adopted by the present invention is: a rail transit traction motor insulated bearing shaft current damage simulation device, comprising a bearing, a main shaft, a hollow shaft, a bearing support, a bearing chuck, a base plate, a vibration and impact loading device, an insulating coating failure device, a current loading device, a first motor and a second motor; the vibration and impact loading device, the bearing support, the insulating coating failure device, the first motor and the second motor are installed on the base plate, and the first motor, the second motor and the base plate are insulated; one end of the main shaft is connected to the output shaft of the first motor; the hollow shaft is provided with a bearing chuck facing the first motor end, and the other end is connected to the second motor; the other end of the main shaft is supported in the bearing chuck through a bearing I, and the hollow shaft is coaxial with the main shaft; the outer ring of the bearing I is interference fit with the bearing chuck, and an insulating layer is provided between the outer ring of the bearing I and the bearing chuck, and the main shaft is supported on the bearing support through a bearing II, and an insulating layer is provided between the outer ring of the bearing II and the bearing support; the vibration and impact loading device is arranged at the bearing support to load the bearing II; the insulating coating failure device is installed corresponding to the bearing I, and is used to make the insulating layer on the outer ring of the bearing I fail.

[0006] In the above-mentioned rail transit traction motor insulated bearing shaft current damage simulation device, the insulating layer on the outer rings of bearings I and II is formed by spraying insulating material on the outer rings of bearings I and II.

[0007] In the above-mentioned rail transit traction motor insulated bearing shaft current damage simulation device, the vibration and impact loading device includes an exciter, an exciter seat and an exciter control device; the exciter seat is installed on the base plate, the exciter is installed on the exciter seat, the exciter is a modal exciter, and is connected to the exciter control device, wherein an insulating gasket is installed on the top of the top column on the exciter, and the insulating gasket is in contact with the outer ring of bearing II.

[0008] In the above-mentioned rail transit traction motor insulated bearing shaft current damage simulation device, a groove is provided on the bearing support, and the groove connects the bottom plate and the outer ring of bearing II; the exciter and exciter seat of the vibration and impact loading device are installed in the groove.

[0009] In the above-mentioned rail transit traction motor insulated bearing shaft current damage simulation device, the insulating coating failure device includes a destructive component, an insulating sleeve, and a destructive component seat. The destructive component seat is fixed on the base plate. A plurality of destructive component mounting holes are provided on the destructive component seat. The destructive component is provided in the destructive component mounting hole. An insulating sleeve is provided between the destructive component and the destructive component mounting hole. The upper end of the fixed destructive component contacts the outer ring of bearing I to achieve failure of the insulation layer of the outer ring of bearing I.

[0010] In the above-mentioned rail transit traction motor insulated bearing shaft current damage simulation device, the current loading device includes a programmable power supply and a conductive slip ring; the conductive slip ring is installed on the main shaft, and the positive and negative poles of the programmable power supply are respectively connected to the conductive slip ring and the destructive component. When the insulating coating fails, the destructive component, bearing I, main shaft, conductive slip ring, and programmable power supply form a closed loop, thereby realizing the current loading of bearing I.

[0011] In the above-mentioned rail transit traction motor insulated bearing shaft current damage simulation device, the main shaft is connected to the first motor through coupling I, and the hollow shaft is connected to the second motor through coupling II. Both coupling I and coupling II use insulating couplings.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The modal exciter used in the present invention has stable amplitude, low noise, large vibration frequency range, wide application range, long service life, and can simulate the vibration and impact conditions that the insulating bearing of rail transit is actually subjected to during operation.

[0014] 2. The present invention can not only simulate the vibration and impact conditions of the insulating bearing of the traction motor, but also simulate the damage caused by the shaft current.

[0015] 3. The present invention discloses the mechanism of the influence of vibration and impact on the degradation of bearing insulation performance.

[0016] 4. The present invention can establish a data-driven motor bearing health status assessment model.

[0017] 5. The present invention realizes the full life cycle application verification of the insulating bearing by monitoring the staged operating status and comparing it with the corresponding theoretical operating status. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a cross-sectional view of the installation of the vibration exciter of the present invention.

[0020] Figure 3 This is a cross-sectional view of the coating failure device of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] like Figure 1-Figure 3As shown, the present invention includes a first motor 1, a coupling Ⅰ2, a main shaft 3, a bearing support 4, a conductive slip ring 5, a bearing Ⅰ6-1, a bearing Ⅱ6-2, a bearing chuck 7, a hollow shaft 8, a vibration and impact loading device, an insulating coating failure device, a second motor 9 and a motor support 10.

[0023] The vibration and impact loading device, the bearing support 4, the insulation coating failure device, are installed on the base plate 11. The first motor and the second motor are respectively installed on the base plate 11 through the motor support 10, and the two motor supports 10 are respectively provided with insulation layers between the base plate. One end of the main shaft 3 is connected to the output shaft of the first motor 1 through the coupling Ⅰ2; the hollow shaft 8 is provided with a bearing chuck 7 at the end facing the first motor 1, and the other end is connected to the second motor 9 through the coupling Ⅱ; the other end of the main shaft is supported in the bearing chuck 7 through the bearing Ⅰ, and the hollow shaft 8 is coaxial with the main shaft 3. The outer ring of the bearing Ⅰ6-1 is interference fit with the bearing chuck 7, and an insulation layer is provided between the outer ring of the bearing Ⅰ6-1 and the bearing chuck. The main shaft 3 is supported on the bearing support 4 through the bearing Ⅱ6-2, and an insulation layer is provided between the outer ring of the bearing Ⅱ6-2 and the bearing support 4. The vibration and impact loading device is arranged at the bearing support to load the bearing Ⅱ. The insulation coating failure device is installed corresponding to the bearing Ⅰ, and is used to make the insulation layer on the outer ring of the bearing Ⅰ fail. Coupling Ⅰ2 and coupling Ⅱ both use insulating couplings. The insulating layer on the outer ring of bearing Ⅰ6-1 and bearing Ⅱ6-2 is formed by spraying insulating material on the outer ring of bearing Ⅰ6-1 and bearing Ⅱ6-2.

[0024] like Figure 2 As shown, the bearing support 4 is provided with a groove 16, and the groove 16 is connected to the base plate 11 and the outer ring of the bearing II 6-2. The vibration and impact loading device includes an exciter 13, an exciter seat 12, and an exciter control device 20; the exciter seat 12 is installed on the base plate 11 and is located in the groove 16. The exciter 13 is installed on the exciter seat 12, and the exciter 13 is a modal exciter. An insulating gasket 15-1 is installed on the top of the top column 22 of the exciter 13, and the insulating gasket 15-1 is in contact with the outer ring of the bearing II 6-2. The exciter 13 is connected to the exciter control device 20, and the vibration and impact loading device provides vibration and impact force for the bearing II 6-2. As shown Figure 3As shown, the insulating coating failure device includes four destructive components 18-1 (not limited to four, can be less than four, can also be more than four), an insulating sleeve 17, and a destructive component seat 14. The destructive component seat 14 is fixed to the bottom plate 11 with screws and is arranged corresponding to the bearing Ⅰ6-1. The destructive component seat 14 is provided with four destructive component mounting holes, and the destructive component mounting holes are provided with destructive components 18-1. The destructive component 18-1 is separated from the destructive component mounting holes by an insulating sleeve 17. The upper end of the destructive component 18-1 contacts the outer ring of the bearing Ⅰ6-1, causing mechanical damage, thereby achieving the failure of the insulating layer of the outer ring of the bearing Ⅰ6-1; the four destructive components 18-1 provide different types of destructive methods for the device.

[0025] The current loading device includes a programmable power supply 21 and a conductive slip ring 5; the conductive slip ring 5 is installed on the main shaft 3, and the positive and negative electrodes of the programmable power supply 21 are connected to the conductive slip ring 5 and the destructive component 18-1 respectively. When the insulating coating fails, the programmable power supply, the destructive component 18-1, the bearing I6-1, the main shaft 3, and the conductive slip ring 5 form a closed loop to realize the current loading of the bearing I6-1.

[0026] The working principle of the present invention is as follows:

[0027] 1) Vibration and impact force loading part: By setting the parameter signal sent to the exciter 13 by the exciter control device 20 and adjusting the vibration frequency of the exciter, the exciter 13 transmits the generated vibration to the outer ring of the bearing II 6-2, simulating the vibration and impact force of the insulating bearing when the rail transit traction motor is running on the track. This design simulates the actual operating conditions of the insulating bearing of the traction motor and the impact on the operating state of the insulating bearing. It is simple and convenient to operate and has high reliability.

[0028] 2) Insulation failure of the insulating bearing: The first motor 1 drives the main shaft 3 to rotate through the coupling Ⅰ2, and the main shaft 3 drives the inner ring of the bearing Ⅰ6-1 to rotate. The second motor 9 drives the hollow shaft 8 to rotate through the coupling Ⅱ, and the hollow shaft 8 drives the bearing chuck to rotate, and the bearing chuck drives the outer ring of the bearing Ⅰ6-1 to rotate, wherein the fixed destructive member 18-1 contacts the outer ring of the bearing Ⅰ6-1, causing mechanical damage, and the insulation layer of the outer ring of the insulating bearing fails.

[0029] 3) Current loading part: The programmable power supply 21 provides a current source. When the insulation performance of the bearing Ⅰ6-1 is damaged, one terminal of the programmable power supply 21 is connected to the destructive component 18-1, the destructive component 18-1 is in contact with the outer ring of the bearing Ⅰ6-1, the inner ring of the bearing Ⅰ6-1 is in contact with the main shaft 3, and the conductive slip ring 5 is installed on the main shaft 3. The other terminal of the programmable power supply 21 is connected to the conductive slip ring to form a closed loop. The parameters of the programmable power supply 21 are adjusted to generate current. The current passes through the loop to simulate the current damage of the insulated bearing shaft of the traction motor.

Claims

1. A rail transit traction motor insulation bearing shaft current damage simulation device, characterized by: It includes a bearing, a main shaft, a hollow shaft, a bearing support, a bearing chuck, a base plate, a vibration and impact loading device, an insulating coating failure device, a current loading device, a first motor and a second motor; the vibration and impact loading device, the bearing support, the insulating coating failure device, the first motor and the second motor are mounted on the base plate, and the first motor, the second motor and the base plate are insulated; one end of the main shaft is connected to the output shaft of the first motor; the hollow shaft is provided with a bearing chuck toward the first motor end, and the other end is connected to the second motor; the other end of the main shaft is supported in the bearing chuck through bearing I, and the hollow shaft is coaxial with the main shaft; the outer ring of bearing I is interference fit with the bearing chuck, and an insulating layer is provided between the outer ring of bearing I and the bearing chuck, the main shaft is supported on the bearing support through bearing II, and an insulating layer is provided between the outer ring of bearing II and the bearing support; the vibration and impact loading device is arranged at the bearing support to load bearing II; the insulating coating failure device is installed corresponding to bearing I, and is used to make the insulating layer on the outer ring of bearing I fail; The insulating layer on the outer rings of bearings I and II is formed by spraying insulating material on the outer rings of bearings I and II; The vibration and impact loading device comprises a vibrator, a vibrator seat and a vibrator control device; the vibrator seat is mounted on the bottom plate, the vibrator is mounted on the vibrator seat, the vibrator is a modal vibrator, and is connected to the vibrator control device, wherein an insulating gasket is mounted on the top of the top column on the vibrator, and the insulating gasket is in contact with the outer ring of the bearing II; The bearing support is provided with a groove, which connects the bottom plate and the outer ring of bearing II; the exciter and the exciter seat of the vibration and impact loading device are installed in the groove; The insulating coating failure device includes a destructive component, an insulating sleeve, and a destructive component seat. The destructive component seat is fixed on a base plate. A plurality of destructive component mounting holes are provided on the destructive component seat. Destructive components are provided in the destructive component mounting holes. An insulating sleeve is provided between the destructive component and the destructive component mounting holes. The upper end of the fixed destructive component contacts the outer ring of bearing I to achieve failure of the insulating layer of the outer ring of bearing I.

2. According to claim 1, the rail transit traction motor insulation bearing shaft current damage simulation device is characterized by: The current loading device includes a programmable power supply and a conductive slip ring; the conductive slip ring is installed on the main shaft, and the positive and negative poles of the programmable power supply are respectively connected to the conductive slip ring and the destructive component. When the insulating coating fails, the destructive component, bearing I, main shaft, conductive slip ring, and programmable power supply form a closed loop, thereby realizing current loading of bearing I.

3. According to claim 1, the rail transit traction motor insulation bearing shaft current damage simulation device is characterized by: The main shaft is connected to the first motor through a coupling I, and the hollow shaft is connected to the second motor through a coupling II. Both coupling I and coupling II are insulating couplings.

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