CN112782479A - Method and device for detecting contact resistance of slip ring - Google Patents
Method and device for detecting contact resistance of slip ring Download PDFInfo
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- CN112782479A CN112782479A CN201911067886.0A CN201911067886A CN112782479A CN 112782479 A CN112782479 A CN 112782479A CN 201911067886 A CN201911067886 A CN 201911067886A CN 112782479 A CN112782479 A CN 112782479A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
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Abstract
The application provides a method and a device for detecting contact resistance of a slip ring. The detection method comprises the following steps: one of the stator and the rotor of the driving slip ring rotates alternately in a first direction and a second direction relative to the other, and the first direction and the second direction are opposite; detecting the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the first direction and the resistance value of the contact resistor when the slip ring rotates towards the second direction; and determining the performance of the contact resistance of the slip ring according to the resistance value of the contact resistance. The detection device is used for detecting the contact resistance of the slip ring and comprises a driving device and a detection module. The driving device is used for driving one of the stator and the rotor of the slip ring to rotate relative to the other in a first direction and a second direction alternately, and the first direction and the second direction are opposite. The detection module is connected with the slip ring and used for detecting the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the first direction and the resistance value of the contact resistor when the slip ring rotates towards the second direction, and determining the performance of the contact resistor of the slip ring according to the resistance values of the contact resistors.
Description
Technical Field
The application relates to the technical field of electric contact sliding connection, in particular to a method and a device for detecting contact resistance of a slip ring.
Background
The slip ring is also called as a conductive slip ring, a collector ring and the like, is a precise power transmission device for realizing image, data signal and power transmission of two relative rotating mechanisms, and is applied to places requiring unlimited continuous or intermittent selection and simultaneously requiring power or data transmission from a fixed position to a rotating position.
Contact resistance is a key performance indicator for conductive slip rings. Because the moving contact and the fixed contact are in a sliding contact state in the rotating process of the slip ring, the contact resistance of the slip ring under the real working condition is difficult to simulate by some existing detection methods and devices, and therefore the contact resistance of the slip ring is difficult to accurately detect.
Disclosure of Invention
The application provides an improved detection method and device for contact resistance of a slip ring.
One aspect of the present application provides a method for detecting a contact resistance of a slip ring, including: driving one of a stator and a rotor of the slip ring to rotate alternately relative to the other in a first direction and a second direction, the first direction and the second direction being opposite; detecting a resistance value of a contact resistor of the slip ring when rotating in the first direction and a resistance value of a contact resistor of the slip ring when rotating in the second direction; and determining the performance of the contact resistor of the slip ring according to the resistance value of the contact resistor.
Another aspect of the present application provides a detecting apparatus for detecting a contact resistance of a slip ring including a stator and a rotor, the detecting apparatus including: a drive means for driving one of the stator and the rotor of the slip ring to rotate alternately relative to the other in a first direction and a second direction, the first direction and the second direction being opposite; the detection module is connected with the slip ring and used for detecting the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the first direction and the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the second direction; and determining the performance of the contact resistor of the slip ring according to the resistance value of the contact resistor.
The detection method of the slip ring contact resistance provided by the embodiment of the application detects the resistance value of the contact resistance of the slip ring when the slip ring rotates towards the first direction and the second direction which are opposite to each other respectively, and determines the performance of the contact resistance of the slip ring according to the resistance value of the contact resistance, so that the condition of the contact resistance under the actual working condition of the slip ring can be reflected more accurately in some embodiments, and the detection precision is high.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
FIG. 1 is a schematic view of a slip ring;
FIG. 2 is a schematic block diagram of one embodiment of a detection apparatus of the present application;
FIG. 3 is a block circuit diagram of one embodiment of the detection apparatus of the present application;
fig. 4 is a schematic perspective view of a rotary stage of the inspection apparatus according to an embodiment of the present invention:
fig. 5 is a schematic flowchart illustrating an embodiment of a method for detecting a contact resistance of a slip ring according to the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of the terms "a" or "an" and the like in the description and in the claims of this application do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
The method for detecting the contact resistance of the slip ring comprises the following steps: one of the stator and the rotor of the driving slip ring rotates alternately in a first direction and a second direction relative to the other, and the first direction and the second direction are opposite; detecting the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the first direction and the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the second direction; and determining the performance of the contact resistance of the slip ring according to the resistance value of the contact resistance. By detecting the contact resistance of the slip ring rotating in the first direction and the second direction, the condition of the contact resistance of the slip ring under the real working condition can be reflected more accurately, and the detection precision is high.
The detection device of the embodiment of the application is used for detecting the contact resistance of the slip ring, and the slip ring comprises a stator and a rotor. The detection device comprises a driving device and a detection module. The driving device is used for driving one of the stator and the rotor of the slip ring to rotate relative to the other in a first direction and a second direction alternately, and the first direction and the second direction are opposite. The detection module is connected with the slip ring and used for detecting the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the first direction and the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the second direction, and determining the performance of the contact resistor of the slip ring according to the resistance values of the contact resistors. The detection device can more accurately reflect the contact resistance condition of the slip ring under the real working condition, and the detection precision is high.
Fig. 1 shows a schematic view of a slip ring 10. In one embodiment, the slip ring 10 is a hat slip ring that may be secured to a flange. In one embodiment, the slip ring 10 may be used in a dome camera for transmitting power and signals during 360 ° rotation of the camera. In the illustrated embodiment, the slip ring 10 includes a stator 11 and a rotor 12. The stator 11 includes a stator wire 112 and brush filaments 111, and the rotor 12 includes a copper ring 120 and a rotor wire 121. During rotation of the slip ring 10, current and signals form a channel through the stator wires 112, the brush wires 111, the copper ring 120 and the rotor wires 121. The slip ring 10 may include a plurality of channels. Wherein the brush filaments 111 and the copper ring 120 are in sliding contact with each other, and have a contact resistance.
The contact resistance includes a concentration resistance, a film resistance, and a conductor resistance. When current passes through the actual contact surfaces of the brush filaments 111 and the copper ring 120, the resistance displayed by the contraction (or concentration) of the current lines is the concentrated resistance or the contracted resistance. The resistance formed by the contact surface film and other pollutants is the film resistance. From the contact surface state analysis, the surface contamination film can be divided into a firmer thin film layer and a looser impurity contamination layer. Therefore, the film resistance can also be referred to as the interface resistance. In the actual measurement of the contact resistance of the slip ring, the contact resistance is measured at the contact leading end, and therefore the actually measured contact resistance also includes the conductor resistance of the contact member other than the contact surface and the lead-out wire itself. The resistance of the conductor is mainly determined by the conductivity of the metal material, and is related to the ambient temperature, and can be characterized by a temperature coefficient.
FIG. 2 is a schematic block diagram of one embodiment of the detection apparatus 20 of the present application. The detection device 20 is used for detecting the contact resistance of the slip ring 10. Referring to fig. 1, the detecting device 20 includes a driving device 22 and a detecting module 21. The driving means 22 are adapted to drive one of the stator 11 and the rotor 12 of the slip ring 10 in rotation with respect to the other alternately in a first direction and in a second direction, the first direction and the second direction being opposite. The detection module 21 is connected to the slip ring 10, and is configured to detect a resistance value of a contact resistor of the slip ring 10 when the slip ring rotates in the first direction and a resistance value of a contact resistor of the slip ring 10 when the slip ring rotates in the second direction. The first direction may be a direction when the rotor 12 of the slip ring rotates in a forward direction with respect to the stator 11, and the second direction may be a direction when the slip ring rotates in a reverse direction. The contact resistance of the slip ring 10 when the slip ring 10 rotates in the first direction and the contact resistance of the slip ring 10 when the slip ring 10 rotates in the second direction are detected, so that the condition of the contact resistance of the slip ring 10 can be reflected more accurately, the detection precision is high, and if the slip ring 10 fails, the failure caused by poor contact resistance can be detected more easily. The situation that only the direction with good contact resistance performance is detected and the other direction is ignored when the contact resistance performance in one direction is good and the contact resistance performance in the other direction is not good is avoided.
In an embodiment, the driving means 22 is adapted to drive the stator 11 of the slip ring 10 to rotate alternately in a first direction and in a second direction with respect to the rotor 12, and the connection between the detecting means 20 and the stator 11 is facilitated. In another embodiment, the driving means 22 are adapted to drive the rotor 12 of the slip ring 10 in rotation alternately in a first direction and in a second direction with respect to the stator 11.
Fig. 3 is a block circuit diagram of one embodiment of the detection device 20 shown in fig. 2. Referring to fig. 1-3, in one embodiment, the drive device 22 includes a motor 221 and a motor drive circuit 222. The motor 221 is connected with the slip ring 10, and the motor driving circuit 222 is connected with the motor 221 and used for driving the motor to rotate. The motor driving circuit 222 can drive the motor 221 to rotate in the forward and reverse directions, and a rotating shaft of the motor 221 is in transmission connection with the stator 11 or the rotor 12 of the slip ring 10, so that one of the stator 11 and the rotor 12 of the slip ring 10 is driven to rotate in the first direction and the second direction alternately relative to the other. The change of the contact resistance of the slip ring 10 under the real working condition is simulated, and the stator or the rotor of the slip ring rotates at a certain speed in the process of detecting the contact resistance of the slip ring. In the related art, the contact resistance is measured by using a direct current bridge low resistance measuring instrument, if the direct current bridge low resistance measuring instrument is manually rotated, the rotating speed can be low, and the measuring result of the contact resistance can be influenced by different rotating speeds. Some embodiments of the present application can control the rotation speed to a certain rotation speed by driving the stator or the rotor of the slip ring 10 to rotate by the driving device 22, and keep the rotation speed substantially or completely unchanged, thereby improving the accuracy of the measurement result.
In one embodiment, the motor 221 includes a stepping motor, and compared to the related art that adopts a dc motor to drive, the stepping motor can avoid the influence of the interference generated by the forward and reverse rotation of the motor on the detection result, and the stepping motor can precisely control the rotation speed of the stator 11 or the rotor 12 of the slip ring 10, so that the detection result is more accurate, and the detection precision and accuracy are improved.
In the illustrated embodiment, the detection device 20 includes a power module 25, and the power module 25 is connected to the slip ring 10 for supplying power to the slip ring 10 according to a set current. In one embodiment, at least one pair of stator wires 112 of the slip ring 10 is shorted in groups of two, the at least one pair of stator wires 112 and the at least one pair of rotor wires 121 forming a channel. In one embodiment, the power module 25 is connected to at least one pair of rotor cables 121 for providing current to the channels of the slip ring 10. In one embodiment, the power module 25 includes a constant current circuit (not shown) to provide a constant current (e.g., 50mA) to the channel of the slip ring 10, simulate the operating current of the slip ring 10, and obtain the contact resistance of the slip ring 10 by detecting the channel voltage of the slip ring 10, so as to obtain the contact resistance of the channel. The constant current circuit has high precision, and the circuit for collecting voltage is simple, so that the contact resistance can be accurately detected, and the circuit is simple.
In one embodiment, the detection module 21 includes an acquisition module 23 and a processor 24 coupled to the acquisition module 23. The collecting module 23 is used for collecting the voltage of the slip ring 10 when rotating towards the first direction and the voltage of the slip ring 10 when rotating towards the second direction. The processor 24 is configured to determine a resistance value of the contact resistor of the slip ring 10 when rotating in the first direction and a resistance value of the contact resistor of the slip ring 10 when rotating in the second direction according to the set current and the collected voltage. In the embodiment shown in fig. 3, the collecting module 23 is connected to the rotor 12 of the slip ring 10, collects the voltage of the rotor 12 of the slip ring 10 when rotating in the first direction and the voltage of the rotor 12 of the slip ring 10 when rotating in the second direction, and the processor 24 determines the resistance value of the contact resistor of the slip ring 10 when rotating in the first direction and the resistance value of the contact resistor of the slip ring 10 when rotating in the second direction according to the set current and the collected voltage of the rotor 12.
In another embodiment, the resistance value of the contact resistance of the slip ring 10 when rotating in the first direction and the resistance value of the contact resistance of the slip ring 10 when rotating in the second direction may be determined by collecting the current of the rotor 12 of the slip ring 10 when rotating in the first direction and the current of the rotor 12 of the slip ring 10 when rotating in the second direction. The voltage may be set constant, current may be collected, or both current and voltage may be collected.
In some embodiments, the power module 25 may power the slip ring 10 at different set currents or voltages depending on the characteristics of the slip ring 10. The magnitude of the working voltage and the working current of the slip ring 10 may affect the measurement result of the contact resistance, and the dc bridge low resistance measurement instrument in the related art cannot set the working voltage and the working current according to the slip ring characteristics, which may cause that the actual test result cannot be equivalent to the application technical requirement of the product. However, some embodiments of the present application may be substantially or entirely equivalent to the application specifications of the slip ring 10.
In one embodiment, the acquisition module 23 includes a signal amplification circuit 232, and the signal amplification circuit 232 is configured to amplify the voltage of the slip ring 10 to generate an amplified voltage. In the embodiment shown in fig. 3, the signal amplification circuit 232 is used to amplify the voltage across the channel of the slip ring 10 to produce an amplified voltage. For example, the voltage across the channel of the slip ring 10 is amplified to 2-3V. Since the resistance value of the contact resistor of one channel of the slip ring 10 is about 200-. In one embodiment, the signal amplifying Circuit 232 and the power supply module 25 may be disposed on the same PCB (Printed Circuit Board).
In one embodiment, the acquisition module 23 includes an acquisition card 231, and the acquisition card 231 is connected to the signal amplification circuit 232 and the processor 24. The acquisition card 231 may acquire the amplified voltage output by the signal amplification circuit 232 and provide the amplified voltage to the processor 24. In one embodiment, the range of the acquisition card 231 is 0-5V, and the acquisition frequency can reach 2MHz, so that slight changes occurring in time during the sliding contact between the brush wires 111 of the slip ring 10 and the copper ring 120 can be captured by the acquisition card 231. When the slip ring works, the stator and the rotor slide constantly, so that the movable contact and the fixed contact slide constantly, the contact resistance changes very quickly, and the sampling rate of the direct current bridge low-resistance measuring instrument in the related technology cannot identify the state of high-speed change. The acquisition module 23 of some embodiments of the present application has a high acquisition frequency and a high sampling rate, so that high-speed changes in contact resistance can be identified.
In the embodiment shown in fig. 3, the processor 24 is connected to the signal amplification circuit 232 for determining the resistance of the contact resistance of the slip ring 10 when rotating in the first direction and the resistance of the contact resistance of the slip ring 10 when rotating in the second direction according to the set current and the amplified voltage. The signal amplifying circuit 232 amplifies the voltage and provides the amplified voltage to the processor 24 for processing, so that the processor 24 can calculate the resistance value of the contact resistor conveniently, and the accuracy is high. In some embodiments, the processor 24 is connected to the signal amplification circuit 232 via the acquisition card 231. The processor 24 includes a computer program for processing the electrical signals collected by the collection module 23 and generating a processing result for analyzing and processing results by users, after-sales service personnel, research and development personnel, and the like. In one embodiment, the detection device 20 includes an interactive device (not shown), which may include a display screen for displaying the detection result, and the processing result may be visually displayed for easy viewing. In one embodiment, the processing results may be displayed in text on a display device. In another embodiment, the processing results may be graphically displayed on a display device. In some embodiments, the interaction means may comprise an operating element, such as a button, knob or the like, for user operation, inputting control instructions or the like. In some embodiments, the interface device may include an interface for interfacing with the slip ring 10 and external devices (e.g., computers, memory devices, etc.).
In the embodiment shown in fig. 3, slip ring 10 includes first stator cable 1121, second stator cable 1122, third stator cable 1123, fourth stator cable 1124, and corresponding first rotor cable 1211, second rotor cable 1212, third rotor cable 1213, and fourth rotor cable 1214. Wherein first stator cable 1121 and second stator cable 1122 are shorted, thereby forming a first channel with first rotor cable 1211 and second rotor cable 1212; third stator wire 1123 and fourth stator wire 1124 are shorted, forming a second channel with third rotor wire 1213 and fourth rotor wire 1214. The power module 25 supplies power to the signal amplification circuit 232 and the first and second channels of the slip ring 10. The voltage of the first channel, i.e. the voltages at the two ends of the first rotor cable 1211 and the second rotor cable 1212, is amplified by the signal amplifying circuit 232 and then output to the acquisition module 23, and then the processor 24 calculates the resistance according to the current and the voltage. Similarly, the voltage of the second channel, that is, the voltages at the two ends of the third rotor cable 1213 and the fourth rotor cable 1214, is amplified by the signal amplifying circuit 232 and then output to the collecting module 23, and then the resistance is calculated by the processor 24 according to the current and the voltage. In one embodiment, the power module 25 includes a plurality of independent power supply circuits, which can independently supply power to the plurality of channels of the slip ring 10, and the plurality of independent power supply circuits are not grounded, so that mutual interference between the plurality of channels of the slip ring 10 can be avoided, and the anti-interference performance is improved.
In some embodiments, the acquisition module 23 may include a plurality of acquisition channels, and may be connected to a plurality of slip rings 10, so that the contact resistance of a plurality of slip rings 10 may be detected simultaneously, and thus a plurality of slip rings may be detected in batch, thereby improving the detection efficiency. The acquisition module 23 may comprise a multi-channel high-speed acquisition card.
In one embodiment, the detection device 20 further comprises a rotary table 30 for mounting the slip ring 10. Fig. 4 is a perspective view of an embodiment of the rotary table 30. Referring to fig. 3, in the illustrated embodiment, the turntable 30 includes a turntable body 31 and a rotating disk 32 protruding from the turntable body 31. The driving device 22 is assembled to the turntable 30 and drives the turntable 32 to rotate. When the slip ring 10 is assembled to the rotary disk 32, the rotary disk 32 rotates, and one of the stator 11 and the rotor 12 of the slip ring 10 may alternately rotate in the first direction and the second direction with the rotary disk 32. In the illustrated embodiment, the rotary plate 32 includes a mounting fixture 321 provided on an upper surface of the rotary plate 32 for fixing the stator 11 or the rotor 12 of the slip ring 10. The mounting clips 321 are at least two so that the slip ring 10 can be more firmly fixed to the rotating disk 32. In the illustrated embodiment, six mounting fixtures 321 are annularly provided on the upper surface of the rotating plate 32, but are not limited to six mounting fixtures 321.
In the illustrated embodiment, the rotating table body 31 includes an upper cover plate 311, a lower cover plate 312, and a support plate 316 disposed between the upper cover plate 311 and the lower cover plate 312. The rotary disk 32 is protruded on the upper cover 311. The driving device 22, the power module 25, and the like may be disposed between the upper cover plate 311 and the lower cover plate 312. The support plate 316 fixes and supports the upper cover plate 311 and the lower cover plate 312. The upper cover 311 is provided with a wiring hole 314 and a wiring rack 315 for laying cables of the power module 25 and the collection module 23. In the illustrated embodiment, the rotating platform 30 further includes a wire-storing compartment 322 disposed between the rotating disk 32 and the upper cover 311, and a receiving box 33 disposed between the upper cover 311 and the lower cover 312. The wire housing 322 is used for housing the stator cable 112 of the slip ring 10, and the housing box 33 is used for placing the driving device 22.
Fig. 5 is a schematic flow chart of an embodiment of a slip ring contact resistance detection method 40 according to the present application. Referring to fig. 1-5, a slip ring contact resistance detection method 40 includes steps 41-43. Wherein:
in step 41, one of the stator 11 and the rotor 12 of the driving slip ring 10 is alternately rotated with respect to the other in a first direction and a second direction, which are opposite to each other.
In one embodiment, one of the stator 11 and the rotor 12 of the driving slip ring 10 rotates continuously at least two turns in at least one of the first direction and the second direction with respect to the other. In one embodiment, one of the driving stator 11 and the rotor 12 rotates continuously at least two turns in the first direction and then rotates continuously at least two turns in the second direction with respect to the other, thus rotating alternately. In one example, the stator 11 is driven by the driving device 22 to rotate continuously for two turns in the first direction relative to the rotor 12, and then the stator 11 is driven to rotate continuously for two turns in the second direction relative to the rotor 12, so that the turns are alternated. In another example, the stator 11 is driven by the driving device 22 to rotate continuously for three turns in the first direction relative to the rotor 12, and then the stator 11 is driven to rotate continuously for two turns in the second direction relative to the rotor 12, so that the turns are alternated. In yet another example, the stator 11 is driven by the driving device 22 to rotate continuously for three turns in the first direction relative to the rotor 12, and then the stator 11 is driven to rotate continuously for three turns in the second direction relative to the rotor 12, so that the rotation is alternated. The above are only some examples, but not limited to the above, and the number of consecutive turns in the first direction may be the same as or different from the number of consecutive turns in the second direction. In other embodiments, one rotation in one of the first and second directions and at least two rotations in the other direction is used. The condition of the contact resistance of the slip ring 10 can be reflected more accurately by continuously rotating for at least two circles, and the detection accuracy is high.
In step 42, the resistance value of the contact resistor of the slip ring 10 when rotating in the first direction and the resistance value of the contact resistor of the slip ring 10 when rotating in the second direction are detected.
In one embodiment, the resistance value of the contact resistance of the slip ring 10 when rotating in the first direction and the resistance value of the contact resistance of the slip ring 10 when rotating in the second direction are detected by the detection module 21. In one embodiment, the slip ring 10 is powered at a set current; collecting the voltage of the slip ring 10 when rotating towards a first direction and the voltage of the slip ring 10 when rotating towards a second direction; the resistance value of the contact resistance of the slip ring 10 when rotating in the first direction and the resistance value of the contact resistance of the slip ring 10 when rotating in the second direction are determined based on the set current and the aforementioned voltage. In one embodiment, the power module 25 supplies power to the channels of the slip ring 10 at a set current; collecting the voltages at two ends of the channel of the slip ring 10 when the slip ring rotates towards the first direction and collecting the voltages at two ends of the channel of the slip ring 10 when the slip ring rotates towards the second direction by using a collecting module 23; the resistance value of the contact resistance of the slip ring 10 when rotating in the first direction and the resistance value of the contact resistance of the slip ring 10 when rotating in the second direction are determined based on the set current and the voltage across the channel of the slip ring 10.
In one embodiment, the voltage of the slip ring 10 is amplified to produce an amplified voltage; the resistance value of the contact resistance of the slip ring 10 when rotating in the first direction and the resistance value of the contact resistance of the slip ring 10 when rotating in the second direction are determined based on the set current and the amplified voltage. In one embodiment, the voltage across the channel of the slip ring 10 is amplified by the signal amplification circuit 232, producing an amplified voltage; the amplified voltages at two ends of the channel of the slip ring 10 are collected through the collection module 23; the resistance of the contact resistance of the slip ring 10 when rotating in the first direction and the resistance of the contact resistance of the slip ring 10 when rotating in the second direction are determined by the processor 24 based on the current provided to the channels of the slip ring 10 by the power module 25 and the amplified voltage generated by the signal amplification circuit 232.
In step 43, the performance of the contact resistance of the slip ring 10 is determined from the resistance value of the contact resistance.
The brush filaments 111 and the copper ring 120 of the channel of the slip ring 10 are in poor contact at a certain position, so that the contact resistance performance of the slip ring 10 is poor. The elastic force of the brush filaments 111 is insufficient or the positions are not aligned, and the contact resistance changes in a large or small amount. Dust or other foreign matter is present on the surface of the copper ring 120 of the slip ring 10, which may cause poor contact between the brush wires 111 and the copper ring 120, and may cause good or bad contact resistance. According to the resistance value of the contact resistor, the performance of the contact resistor of the slip ring 10 can be determined, and the state of the slip ring 10 can be determined to determine whether a fault occurs.
In one embodiment, the performance of the contact resistance may be determined based on a change in the resistance value of the contact resistance of the slip ring 10 when rotating in the first direction and a change in the resistance value of the contact resistance of the slip ring 10 when rotating in the second direction. The change in contact resistance is mainly caused by the change in the collective resistance and the film resistance. Due to the instability of the contact surface in the working state of the slip ring, the detection of the contact resistance change becomes a key detection item for detecting the quality of the slip ring. By detecting the change in the resistance of the contact resistor, the performance of the contact resistor can be accurately determined. The change of the contact resistance in different rotating directions can be detected, and the performance of the contact resistance can be accurately determined.
In one embodiment, the maximum value and the minimum value of a plurality of resistance values of the contact resistor rotating at least one circle are determined, the difference value between the maximum value and the minimum value is determined, and the performance of the contact resistor of the slip ring 10 is determined according to the difference value, so that the performance of the contact resistor can be accurately determined according to the value with the maximum change of the resistance values. And when the device rotates for one circle, a plurality of resistance values are collected. The difference between the maximum and minimum values of the contact resistance of at least one turn when rotating in the first direction and the difference between the maximum and minimum values of the contact resistance of at least one turn when rotating in the second direction may be determined, and based on the differences, the performance of the contact resistance of the slip ring 10 may be determined. The difference between the maximum and minimum values of the contact resistance per revolution when rotating in the first direction and the difference between the maximum and minimum values of the contact resistance per revolution when rotating in the second direction may be determined, and based on these differences, the behavior of the contact resistance of the slip ring 10 is determined.
In one embodiment, the difference is compared with a difference threshold, if the difference is smaller than the difference threshold, the contact resistance of the slip ring 10 is determined to be acceptable, and if the difference is not smaller than the difference threshold, the contact resistance of the slip ring 10 is determined to be unacceptable. If the difference is smaller than the difference threshold, the maximum value of the resistance value change is smaller than the difference threshold, the change is smaller, the contact resistance is qualified, and the performance is good. Otherwise, the contact resistance has poor performance and is not qualified. In some embodiments, the difference threshold may be set according to characteristics of different slip rings 10, or the same difference threshold may be set for different slip rings 10.
In one embodiment, the difference between the maximum value and the minimum value of the contact resistance for each of the plurality of revolutions is determined, and the performance of the contact resistance is determined based on the magnitude and variation of the plurality of differences for the plurality of revolutions. In one embodiment, the maximum value and the minimum value of the plurality of resistance values of the contact resistance in each turn of the stator 11 of the corresponding slip ring 10 alternately rotating in the first direction and the second direction with respect to the rotor 12 within a set time (e.g., 1-10 minutes) are determined by the processor 24, and the difference value corresponding to each turn is determined. For example, the time for one rotation of the motor may be set to 0.6 second, and the maximum value, the minimum value, and the difference value of the contact resistance during this time may be counted every 0.6 second. The difference value of each turn is compared with a difference threshold value respectively to determine the contact resistance performance of each turn, and thus the contact resistance performance of the slip ring 10. The change situation of the difference value of the contact resistance of a plurality of turns is analyzed, the contact resistance of the slip ring 10 can be determined to be occasionally poor or always poor, the analysis of the failure reason of the slip ring 10 is facilitated, and the detection of the fault caused by poor contact resistance is facilitated.
In some embodiments, the difference between the maximum and minimum contact resistance values for each of all revolutions of the slip ring 10 may be determined, and the performance of the contact resistance values may be determined based on the magnitude and variation of the difference. In other embodiments, the performance of the contact resistance may be determined by selecting a number of turns from all turns of the slip ring 10, determining the difference between the maximum value and the minimum value of the contact resistance for each of the turns, and determining the performance of the contact resistance based on the magnitude and variation of the difference. For example, the middle turns can be selected, and the slip ring 10 can operate more stably and the detection is more accurate. In some embodiments, step 43 may be performed by processor 24 as described above.
The actions of the detection method 40 are illustrated in the form of modules, and the sequencing of the modules and the division of the actions within the modules shown in fig. 5 are not limited to the illustrated embodiments. For example, the modules may be performed in a different order; actions in one module may be combined with actions in another module or split into multiple modules. In some embodiments, there may be additional steps before, after, or in between the steps of the detection method 40.
For the method embodiments, since they substantially correspond to the apparatus embodiments, reference may be made to the apparatus embodiments for relevant portions of the description. The method embodiment and the device embodiment are complementary.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (14)
1. A method for detecting a slip ring contact resistance, the method comprising:
driving one of a stator and a rotor of the slip ring to rotate alternately relative to the other in a first direction and a second direction, the first direction and the second direction being opposite;
detecting a resistance value of a contact resistor of the slip ring when rotating in the first direction and a resistance value of a contact resistor of the slip ring when rotating in the second direction; and
and determining the performance of the contact resistor of the slip ring according to the resistance value of the contact resistor.
2. The detection method according to claim 1, characterized in that: the detecting a resistance value of a contact resistance of the slip ring when rotating in the first direction and a resistance value of a contact resistance of the slip ring when rotating in the second direction includes:
supplying power to the slip ring according to a set current;
collecting the voltage of the slip ring when rotating towards the first direction and the voltage of the slip ring when rotating towards the second direction; and
and determining the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the first direction and the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the second direction according to the set current and the voltage.
3. The detection method according to claim 2, characterized in that: the determining a resistance value of a contact resistance of the slip ring when rotating in the first direction and a resistance value of a contact resistance of the slip ring when rotating in the second direction includes:
amplifying the voltage of the slip ring to generate an amplified voltage; and
and determining the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the first direction and the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the second direction according to the set current and the amplified voltage.
4. The detection method according to claim 1, characterized in that: the determining the performance of the contact resistance of the slip ring according to the resistance value of the contact resistance comprises the following steps:
determining the performance of the contact resistance based on a change in the resistance of the contact resistance when rotating in the first direction and a change in the resistance of the contact resistance when rotating in the second direction.
5. The detection method according to claim 4, characterized in that: the determining the performance of the contact resistance based on a change in the resistance of the contact resistance when rotating in the first direction and a change in the resistance of the contact resistance when rotating in the second direction includes:
determining a maximum value and a minimum value among a plurality of resistance values of the contact resistance rotated by at least one turn;
determining a difference between the maximum value and the minimum value;
comparing the difference value with a difference value threshold value;
and if the difference value is smaller than the difference value threshold value, determining that the contact resistance of the slip ring is qualified.
6. A detection method according to claim 5, characterized in that: the determining the performance of the contact resistance of the slip ring according to the difference comprises:
determining the difference between the maximum value and the minimum value of the contact resistance for each of a plurality of revolutions; and
and determining the performance of the contact resistance according to the size and the change of a plurality of difference values of a plurality of turns.
7. A detecting device for detecting a contact resistance of a slip ring including a stator and a rotor, the detecting device comprising:
a drive means for driving one of the stator and the rotor of the slip ring to rotate alternately relative to the other in a first direction and a second direction, the first direction and the second direction being opposite;
the detection module is connected with the slip ring and used for detecting the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the first direction and the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the second direction; and determining the performance of the contact resistor of the slip ring according to the resistance value of the contact resistor.
8. The detection device of claim 7, wherein: the detection device comprises a rotating table for assembling the sliding ring, and the rotating table comprises a rotating table body and a rotating disc which is convexly arranged on the rotating table body.
9. The detection device of claim 8, wherein: the rotating disc comprises a mounting clamp arranged on the upper surface of the rotating disc and used for fixing the sliding ring.
10. The detection device of claim 7, wherein: the detection device comprises a power supply module, a slip ring and a detection module, wherein the power supply module is used for supplying power to the slip ring according to set current;
the detection module comprises an acquisition module and a processor connected with the acquisition module, and the acquisition module is used for acquiring the voltage of the slip ring when the slip ring rotates towards the first direction and the voltage of the slip ring when the slip ring rotates towards the second direction; the processor is used for determining the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the first direction and the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the second direction according to the set current and the set voltage.
11. The detection device of claim 10, wherein: the acquisition module comprises a signal amplification circuit and is used for amplifying the voltage of the slip ring to generate an amplified voltage; the processor is connected with the signal amplification circuit and used for determining the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the first direction and the resistance value of the contact resistor of the slip ring when the slip ring rotates towards the second direction according to the set current and the amplified voltage.
12. The detection device of claim 7, wherein: the processor is configured to determine a performance of the contact resistance based on a change in the resistance of the contact resistance when the contact resistance is rotated in the first direction and a change in the resistance of the contact resistance when the contact resistance is rotated in the second direction.
13. The detection device of claim 12, wherein: the processor is configured to determine a maximum value and a minimum value of a plurality of resistance values of the contact resistance for at least one rotation; comparing the difference value with a difference value threshold value; and if the difference value is smaller than the difference value threshold value, determining that the contact resistance of the slip ring is qualified.
14. The detection device of claim 13, wherein: the processor is configured to determine the difference between the maximum value and the minimum value of the contact resistance for each of a plurality of revolutions; and determining the performance of the contact resistance according to the size and the change of a plurality of difference values of a plurality of turns.
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| CN201911067886.0A CN112782479A (en) | 2019-11-04 | 2019-11-04 | Method and device for detecting contact resistance of slip ring |
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