CN116165402A - Motor shaft voltage test structure - Google Patents
Motor shaft voltage test structure Download PDFInfo
- Publication number
- CN116165402A CN116165402A CN202211557110.9A CN202211557110A CN116165402A CN 116165402 A CN116165402 A CN 116165402A CN 202211557110 A CN202211557110 A CN 202211557110A CN 116165402 A CN116165402 A CN 116165402A
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- motor
- bolt
- motor shaft
- shaft voltage
- voltage test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- General Physics & Mathematics (AREA)
- Motor Or Generator Frames (AREA)
Abstract
The invention relates to test equipment for motor shaft voltage, in particular to a motor shaft voltage test structure. A motor shaft voltage test structure comprises an electric brush, an M16 hollow nylon bolt, a spring, an electric wire, a blocking plate, corns and a stop piece; the electric brush, the spring, the stop piece, the blocking plate, the corn and the wire assembly are sequentially arranged in the M16 hollow nylon bolt, so that a shaft voltage testing structure is formed, a screw hole of M16 is reserved in the top of the non-transmission end cover of the motor and the center of the wind shield plate respectively, and when the shaft end voltage is measured, the screw hole of the top of the non-end cover can be selectively arranged on the M16 hollow nylon bolt according to the actual condition of the site, and the screw hole of the center of the wind shield plate can also be selectively arranged on the M16 hollow nylon bolt. The invention provides a motor shaft voltage test structure for testing the shaft end voltage of a traction motor in the field of rail transit, and aims at measuring the shaft voltage on the premise of not damaging the sealing performance of the motor in a narrow space.
Description
Technical Field
The invention relates to test equipment for motor shaft voltage, in particular to a motor shaft voltage test structure.
Background
In recent years, with the rapid development of rail transit at home and abroad, related technologies in the field also have a rapid development trend. The traction motor is used as one of core components of the rail transit vehicle and used for running and braking the traction vehicle, and along with the progress of technical development, the requirements on the rail transit traction motor are higher and higher. The shaft end voltage of the traction motor is taken as one of factors which jeopardize the normal operation of the traction motor, and the measurement of the shaft end voltage of the traction motor has great significance on the operation of the traction motor.
The motor shaft voltage refers to the voltage generated between bearings at two ends of the motor or between a motor rotating shaft and the bearings when the motor operates. Under normal conditions, when the shaft voltage is lower, a lubricating oil film existing between the motor rotating shaft and the bearing can play a good insulating role. However, if the shaft voltage increases to a certain value for some reason, the breakdown oil film discharges, and a loop for the shaft current generation is formed. The stability of an oil film can be damaged by shaft current, so that the lubrication and cooling oil quality is gradually deteriorated, meanwhile, the shaft current passes through a metal contact point of a bearing and a rotating shaft, the metal contact point is small, the current density is high, and high temperature can be generated instantaneously, so that the bearing is partially burned. The burned bearing splashes under the action of the rolling force, and small pits are burned on the inner surface of the bearing. Eventually, the bearings may break due to accelerated mechanical wear. It is therefore necessary to measure the voltage generated between the motor shaft and the bearing.
If the shaft voltage of the motor is to be accurately measured, a wire is led to each of a base and a rotor of the motor, and the voltage value between the wires is recorded. Because the grounding column of the general motor is arranged on the machine base, the side lead of the machine base can be directly led out from the grounding column; in the case of the rotor, the rotor-side lead can only be led out from the shaft extension or the tail of the rotating shaft of the rotor because of the high-speed rotation and compact internal space. However, for the rail transit traction motor, a shaft extension part (namely a transmission end) of a motor rotor is provided with a shaft coupling, the shaft coupling always runs at a high speed, the space of the shaft extension part of the rotor is narrow, and no space can be reserved for installing a voltage test structure; the non-transmission end of the traction motor is generally a wheel, the use environment is bad, and the traction motor is generally mechanically sealed to the non-transmission end and cannot be directly detected.
Patent CN 112751443A discloses a motor shaft voltage testing structure, which consists of a bearing, an end cover, an electric brush fixing frame, a lead-out wire, an insulating sleeve, a spring, an electric brush, a shaft sleeve, an outer cover, a rotating shaft and other parts. The end of pivot passes through the bearing to be installed in the end cover, and the terminal surface of end cover is provided with the enclosing cover, is provided with the perforation on the enclosing cover, and the axle sleeve passes the perforation to be fixed on the terminal surface of pivot, and brush mount one end is fixed on the end cover, and the other end extends to axle sleeve department, and the brush setting is in insulating cover and with axle sleeve butt, fixes the brush mount on the end cover of motor non-driving end, cooperates the axle sleeve of follow pivot end extension installation to detect the voltage value. The technical scheme has the defects that: (1) The structure relates to a plurality of sub-components, and has great assembly difficulty in a narrow space; (2) The structure needs to be assembled on the motor in advance, and is not easy to disassemble after loading.
Patent CN 215894736U discloses a voltage testing structure for a permanent magnet synchronous motor shaft, which consists of end covers, boss ring grooves, motor shafts, hole covers, radial inner grooves, rectangular grooves, springs, carbon brushes, wires and other sub-components. The first semicircle hole cover and the second semicircle hole cover are assembled at the protruding position of the motor shaft relative to the end cover in a splicing way, the two carbon brushes are respectively attached to the corresponding outer ring surface of the motor shaft through springs, the wires of the carbon brushes on the first semicircle hole cover are used for detecting voltage values through a wire passing hole external voltage detection device, and the second semicircle hole cover is connected with the carbon brushes and the end cover through conductors, so that current generated on the motor shaft is led out through a grounding wire. The technical scheme has the defects that: (1) the structure is not easily disassembled; (2) The structure is arranged at the position of the motor transmission end, and the danger coefficient is larger when the motor operates.
Disclosure of Invention
The invention provides a motor shaft voltage testing structure, which solves the problem that the existing structure cannot measure the shaft voltage in a narrow space without damaging the sealing performance of a motor by using the simplest structure. According to the invention, the screw holes of M16 are reserved at the top of the non-end cover of the motor and the center of the fan mask plate respectively, and the shaft voltage testing structure and the motor are fixed together in a threaded connection mode, so that the structure is simple, the installation and the disassembly are convenient, and the problem of installing the shaft voltage testing structure in a narrow space in the prior art is solved.
The invention is realized by adopting the following technical scheme: a motor shaft voltage test structure comprises an electric brush, a non-conductive bolt, an electric wire and a stop piece; the inside processing of bolt has the mounting hole, and the tip processing of bolt has the mounting groove, and the mounting groove at bolt tip is installed to the backstop piece, and the electric brush other end installation electric wire, electric wire extend along bolt axis direction, extend the bolt through the centre aperture of backstop piece, and a screw hole is reserved at the wind gap cover plate middle part of motor, and this screw hole is as main mounting hole.
When the shaft end voltage needs to be measured, the shaft voltage testing structure and the motor are fixed together in a threaded connection mode, and at the moment, one end of the electric brush is contacted with a shaft head pressing plate in the motor; when the shaft end voltage does not need to be measured, the reserved threaded hole of the motor is blocked by using an additional bolt and a gasket.
According to the motor shaft voltage testing structure, the spring is arranged in the bolt, the wire is sleeved in the spring, one end of the spring is contacted with the other end of the electric brush, and the other end of the spring is contacted with the stop piece. The spring can push the electric brush, so that the electric brush is always attached to the shaft head pressing plate of the motor, and the contact effect of the electric brush and the shaft head pressing plate of the motor is improved.
The motor shaft voltage test structure is characterized in that the bolts for the fixed shaft voltage test structure and the motor are M16 hollow nylon bolts, the M16 hollow nylon bolts are made of nylon materials, and nylon is non-conductive.
According to the motor shaft voltage testing structure, the center of the stop piece is small Kong Limian, the corn is arranged, the electric wire is firmly fixed at the center small hole of the stop piece through the corn, and the electric wire is conveniently led out from the inside of the bolt.
According to the motor shaft voltage testing structure, the blocking plate is further arranged in the end portion mounting groove of the bolt and located on the outer side of the blocking piece, and the situation that the electric brush in the motor shaft voltage testing structure is subjected to overlarge stress in the motor shaft end voltage testing is prevented from jumping out of the end portion of the bolt.
According to the motor shaft voltage test structure, the screw hole is formed in the top of the non-transmission end cover of the motor and is used as a standby mounting hole, the screw hole is reserved in the non-transmission end cover of the motor, when the shaft end voltage needs to be measured, the shaft voltage test structure and the motor are fixed together in a threaded connection mode, and at the moment, one end of the electric brush is in contact with a main fan in the motor; when the shaft end voltage does not need to be measured, the reserved threaded hole is blocked by the bolts and the gaskets, so that the problem that the tightness of the traction motor is damaged due to the replacement of the shaft voltage test structure is solved. A screw hole is reserved at the top of the non-transmission end cover of the motor and the center of the wind shield plate respectively, and when the voltage of the shaft end is measured, the screw hole at the center of the wind shield plate can be selectively installed with the bolt according to the actual condition of the site, and the screw hole at the top of the non-transmission end cover can also be selectively installed with the bolt. The screw holes are reserved in the non-transmission end cover and the air port cover plate respectively, when the shaft end voltage is measured, bolts are installed in the reserved screw holes, the fixation of the motor and the motor shaft voltage testing structure is completed, and the installation difficulty of the motor shaft voltage testing structure is simplified in a threaded connection mode.
The invention provides a motor shaft voltage test structure for testing the shaft end voltage of a traction motor in the field of rail transit, and aims at measuring the shaft voltage on the premise of not damaging the sealing performance of the motor in a narrow space.
The motor shaft voltage testing structure provided by the invention is connected with the non-transmission end cover or the tuyere cover plate of the motor through the M16 hollow nylon bolt, does not need other connecting elements, is small in size and simple in structure, and is more convenient and simple to measure the shaft voltage in a narrow space.
The spring is arranged in the M16 hollow nylon bolt, and the spring pushes the electric brush, so that the electric brush is always attached to the shaft head pressing plate of the motor or the main fan, the contact effect of the electric brush and the motor is improved, and the test result is more accurate.
A blocking plate and a stop piece are arranged at the end part of the M16 hollow nylon bolt, so that the electric brush in the motor shaft end voltage test structure is prevented from being jumped out from the end part due to overlarge stress in the motor shaft end voltage test.
Drawings
FIG. 1 is a schematic diagram of a motor shaft voltage test structure.
Fig. 2 is a schematic diagram of an axial voltage test structure.
In the figure: the device comprises a 1-non-transmission end cover, a 2-standby mounting port, a 3-main fan, a 4-tuyere cover plate, a 5-rotating shaft, a 6-shaft head pressing plate, a 7-main mounting port, an 8-motor shaft voltage test structure, a 9-electric brush, a 10-M16 hollow nylon bolt, a 11-spring, a 12-electric wire, a 13-blocking plate, a 14-corn and a 15-blocking piece.
Detailed Description
The invention provides a motor shaft voltage testing structure aiming at the problem that the shaft voltage measurement is carried out on the premise of not damaging the sealing performance of a motor in a narrow space, solves the problem that the conventional structure cannot carry out the shaft voltage measurement on the premise of not damaging the sealing performance of the motor in the narrow space, and has the advantages of convenience in installation and disassembly, simple structure and the like. The structure of which is shown in figures 1 and 2.
The invention provides a motor shaft voltage testing structure which comprises an electric brush 9, an M16 hollow nylon bolt 10, a spring 11, an electric wire 12, a blocking plate 13, a eyelet 14 and a stop piece 15. The non-transmission end cover 1 and the tuyere cover plate 4 are respectively reserved with a threaded hole of M16, and when the shaft end voltage needs to be measured, the shaft voltage testing structure and the motor are fixed together in a threaded connection mode; when the shaft end voltage does not need to be measured, the screw holes of the reserved M16 are blocked by the bolts and gaskets of the M16.
And when the voltage of the shaft end is measured, the hollow screw Long Luoshuan 10 of the M16 is installed in the reserved screw holes, so that the fixation of the motor and the motor shaft voltage test structure is completed, and the installation difficulty of the motor shaft voltage test structure is simplified in a threaded connection mode.
The top of the non-transmission end cover 1 of the motor and the center of the tuyere cover plate 4 are respectively reserved with a threaded hole of M16, when the shaft end voltage is measured, the threaded holes of the top of the non-transmission end cover 1 can be selectively installed with the M16 hollow nylon bolts 10 according to the actual conditions of the site, and the threaded holes of the center of the tuyere cover plate 4 can also be selectively installed with the M16 hollow nylon bolts 10.
The shaft voltage testing structure consists of parts such as an electric brush 9, an M16 hollow nylon bolt 10, a spring 11, an electric wire 12, a blocking plate 13, a eyelet 14, a stop piece 15 and the like. The brush 9, the spring 11, the stop piece 15, the blocking plate 13, the eyelet 14, the wire 12 and other components are sequentially arranged in the M16 hollow nylon bolt 10, so that the shaft voltage testing structure is formed.
The M16 hollow nylon bolt 10 for the fixed shaft voltage test structure and the motor is made of nylon material, and nylon is non-conductive.
One end of the electric brush 9 is contacted with the shaft head pressing plate 6 or the main fan 3 in the motor, an electric wire 12 is arranged at the other end of the electric brush, the electric wire 12 extends along the axial direction of the M16 hollow nylon bolt 10, and a stop piece 15 is arranged in the M16 hollow nylon bolt 10 to prevent the electric brush 9 from running out from the end part of the M16 hollow nylon bolt 10.
The spring 11 is arranged in the M16 hollow nylon bolt 10, and the spring 11 pushes the electric brush 9, so that the electric brush 9 is always attached to the shaft head pressing plate 6 of the motor or the main fan 3, and the contact effect of the electric brush 9 and the shaft head pressing plate 6 of the motor or the main fan 3 is improved.
The center of the stop piece 15 is provided with a small hole, and a small Kong Limian is provided with a corn 14, so that the electric wire 12 is conveniently led out from the inside of the M16 hollow nylon bolt 10.
The small Kong Limian at the center of the stop piece 15 is provided with a eyelet 14, and the electric wire 12 is firmly fixed at the small hole at the center of the stop piece 15 through the eyelet 14.
A blocking plate 13 is arranged at the end part of the M16 hollow nylon bolt 10, so that the electric brush 9 in the motor shaft end voltage test structure is prevented from being bounced out from the end part due to overlarge stress in the motor shaft end voltage test.
The invention reserves a screw hole of M16 at the top of the non-end cover of the motor and the right center of the wind-shield plate respectively, when the voltage of the shaft end needs to be measured, the grounding brush component of the shaft end of M16 is arranged on the screw hole of M16 reserved at the right center of the wind-shield plate, and the motor and the grounding brush component of the shaft end of M16 are fixed together; when the distance between the wind gap cover plate of the motor and the vehicle body is insufficient to install the M16 shaft end grounding brush assembly, the M16 shaft end grounding brush assembly is installed on a screw hole reserved at the top of a non-end cover of the motor, the motor and the M16 shaft end grounding brush assembly are fixed together, and the problem that the shaft voltage testing structure cannot be installed due to the fact that the distance between the motor and the vehicle body is too short is solved.
Claims (6)
1. A motor shaft voltage test structure which is characterized in that: comprises a brush (9), a non-conductive bolt, an electric wire (12) and a stop piece (15); the inside processing of bolt has the mounting hole, and the tip processing of bolt has the mounting groove, and in the mounting groove of bolt tip was installed to backstop piece (15), electric brush (9) other end installation electric wire (12), electric wire (12) extend along bolt axis direction, extend the bolt through the centre aperture of backstop piece (15), a screw hole is reserved at the wind gap cover plate (4) middle part of motor.
2. The motor shaft voltage test structure according to claim 1, wherein: a spring (11) is arranged in the bolt, the spring (11) is used for sleeving the electric wire (12) inside, one end of the spring (11) is contacted with the other end of the electric brush (9), and the other end of the spring (11) is contacted with the stop piece (15).
3. A motor shaft voltage test structure according to claim 1 or 2, characterized in that: the bolts for the fixed shaft voltage testing structure and the motor are M16 hollow nylon bolts (10), the M16 hollow nylon bolts (10) are made of nylon materials, and nylon is non-conductive.
4. A motor shaft voltage test structure according to claim 1 or 2, characterized in that: the eyelet (14) is arranged at the center small Kong Limian of the stop piece (15), and the electric wire (12) is firmly fixed at the center small hole of the stop piece (15) through the eyelet (14), so that the electric wire (12) is conveniently led out from the inside of the bolt.
5. A motor shaft voltage test structure according to claim 1 or 2, characterized in that: a blocking plate (13) is further arranged in the end part mounting groove of the bolt, the blocking plate (13) is positioned on the outer side of the stop piece (15), and the electric brush (9) in the motor shaft end voltage test structure is prevented from being jumped out from the end part of the bolt due to overlarge stress in the motor shaft end voltage test.
6. A motor shaft voltage test structure according to claim 1 or 2, characterized in that: the top of the non-transmission end cover (1) of the motor is also provided with a threaded hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211557110.9A CN116165402A (en) | 2022-12-06 | 2022-12-06 | Motor shaft voltage test structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211557110.9A CN116165402A (en) | 2022-12-06 | 2022-12-06 | Motor shaft voltage test structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116165402A true CN116165402A (en) | 2023-05-26 |
Family
ID=86417155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211557110.9A Pending CN116165402A (en) | 2022-12-06 | 2022-12-06 | Motor shaft voltage test structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116165402A (en) |
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2022
- 2022-12-06 CN CN202211557110.9A patent/CN116165402A/en active Pending
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