CN215815750U - Rotation parameter detection device for circuit breaker and circuit breaker - Google Patents
Rotation parameter detection device for circuit breaker and circuit breaker Download PDFInfo
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- CN215815750U CN215815750U CN202121449896.3U CN202121449896U CN215815750U CN 215815750 U CN215815750 U CN 215815750U CN 202121449896 U CN202121449896 U CN 202121449896U CN 215815750 U CN215815750 U CN 215815750U
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Abstract
The embodiment of the utility model provides a rotation parameter detection device for a circuit breaker and the circuit breaker, wherein the rotation parameter detection device comprises: the rotating sensing module comprises a magnet and a framework, wherein the framework is wound with a winding, one of the magnet and the framework is arranged on the end face of the rotating shaft, and the other of the magnet and the framework is arranged at intervals with the rotating shaft; the signal processing module comprises an A/D conversion module and a data processing module, wherein the input end of the A/D conversion module is electrically connected with the winding, the output end of the A/D conversion module is electrically connected with the data processing module, when the rotating shaft rotates, the magnet rotates relative to the framework, the winding outputs a first voltage signal, the A/D conversion module converts the first voltage signal into a second voltage signal and outputs the second voltage signal to the data processing module, the data processing module calculates according to the second voltage signal to obtain rotation parameters, and the rotation parameters comprise at least one of rotating speed and rotating angle. The embodiment of the utility model can realize the real-time detection of the rotation parameters of the circuit breaker.
Description
Technical Field
The utility model belongs to the technical field of circuit breakers, and particularly relates to a rotation parameter detection device for a circuit breaker and the circuit breaker.
Background
The circuit breaker is used for closing and opening current in high and low voltage lines, and most of low voltage circuit breakers realize the separation or closing of a moving contact and a static contact through the rotation of a rotating shaft, so that the opening or closing of the current in the high and low voltage lines is realized. Whether the circuit breaker can realize the on-off or the on-off of the current in a short time is closely related to design parameters such as the rotating speed and the rotating angle of the rotating shaft, and the design parameters can effectively reflect the mechanical performance of the circuit breaker. At present, the working performance of the circuit breaker is usually checked by adopting a manual periodic checking mode, but the rotating parameter of the circuit breaker cannot be detected by adopting the manual periodic checking mode.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a rotation parameter detection device for a circuit breaker and the circuit breaker, which can detect the rotation parameter of the circuit breaker in real time.
In a first aspect, an embodiment of the present invention provides a device for detecting a rotation parameter of a circuit breaker, where the circuit breaker includes a moving contact and a fixed contact, and further includes a rotating shaft for driving the moving contact to move away from or close to the fixed contact; the rotation parameter detecting device includes:
the rotating sensing module comprises a magnet and a framework, wherein the framework is wound with a winding, one of the magnet and the framework is arranged on the end face of the rotating shaft, and the other of the magnet and the framework is arranged at intervals with the rotating shaft;
the signal processing module comprises an A/D conversion module and a data processing module, wherein the input end of the A/D conversion module is electrically connected with the winding, the output end of the A/D conversion module is electrically connected with the data processing module,
when the rotating shaft rotates, the magnet rotates relative to the framework, the winding outputs a first voltage signal, the A/D conversion module converts the first voltage signal into a second voltage signal and outputs the second voltage signal to the data processing module, the data processing module calculates according to the second voltage signal to obtain a rotation parameter, and the rotation parameter comprises at least one of rotating speed and rotating angle.
In a second aspect, an embodiment of the present invention provides a circuit breaker, including:
the rotating shaft is used for driving the moving contact to move away from or close to the fixed contact; and
the rotational parameter detection device according to the first aspect.
In the embodiment of the utility model, the rotation parameter detection device is arranged for the circuit breaker, when the rotating shaft of the circuit breaker rotates, the rotation sensing module can rotate along with the rotating shaft to generate a voltage signal, and the signal processing module can calculate the rotation parameter of the rotating shaft according to the voltage signal. Therefore, the embodiment of the utility model can realize the real-time detection of the rotation parameters of the circuit breaker.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a circuit breaker with a rotation sensing module according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a rotation sensing module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a signal processing module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another signal processing module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another rotation sensing module according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
As shown in fig. 1, the circuit breaker 10 includes a fixed contact 11 and a movable contact 12, the fixed contact 11 and the movable contact 12 form a contact pair, and the movable contact 12 can be mounted on a support 13. The circuit breaker 10 further includes a rotating shaft 14, the rotating shaft 14 may be connected to the supporting member 13 through a link mechanism 15, and when the rotating shaft rotates, the link mechanism 15 may be pushed to drive the supporting member 13 to move, so as to drive the movable contact 12 to move. Specifically, when the circuit breaker 10 needs to be switched on, the moving contact 12 moves towards the direction close to the static contact 11, and the moving contact 12 and the static contact 11 are closed; when the circuit breaker 10 needs to be opened, the moving contact 12 moves in a direction away from the fixed contact 11, and the moving contact 12 is separated from the fixed contact 11.
In the whole process, the movable contact 12 of the circuit breaker 10 moves in a small range, the rotating angle of the rotating shaft 14 is generally small, for example, the rotating angle of the rotating shaft 14 does not exceed 45 °, but the circuit breaker 10 needs to close or open the switch in a short time, and therefore, it is necessary to ensure that the movable contact 12 moves at a fast speed, and the moving speed of the movable contact 12 is in a positive correlation with the rotating speed of the rotating shaft 14.
In order to monitor the working performance of the circuit breaker 10, the working performance can be monitored by detecting the rotation parameters of the rotating shaft 14, and the embodiment of the utility model is to detect the rotation parameters of the rotating shaft 14 by arranging a rotation parameter detection device.
As shown in fig. 1 to 4, the rotation parameter detecting device includes:
the rotation sensing module 20 comprises a magnet 21 and a framework 22, wherein the framework 22 is wound with a winding (not shown), one of the magnet 21 and the framework 22 is arranged on the end face of the rotating shaft 14, and the other is arranged at a distance from the rotating shaft 14;
the signal processing module 30 includes an a/D conversion module 31 (shown as "a/D" in the figure) and a data processing module 32 (shown as "MCU" in the figure), the input terminal of the a/D conversion module 31 is electrically connected to the output terminal 23 of the winding, the output terminal of the a/D conversion module 31 is electrically connected to the data processing module 32,
when the rotating shaft 14 rotates, the magnet 21 rotates relative to the framework 22, the output end 23 of the winding outputs a first voltage signal, the a/D conversion module 31 converts the first voltage signal into a second voltage signal and outputs the second voltage signal to the data processing module 32, and the data processing module 32 calculates a rotation parameter according to the second voltage signal, wherein the rotation parameter includes at least one of a rotating speed and a rotating angle.
In some embodiments, the magnet 21 is disposed on the end surface of the rotating shaft 14, and the frame 22 is disposed at a distance from the rotating shaft 14, so that the magnet 21 can rotate together with the rotating shaft 14 as a follower, and the frame 22 can always remain stationary.
In some embodiments, the frame 22 is disposed on the end surface of the rotating shaft 14, and the magnet 21 is disposed at a distance from the rotating shaft 14, so that the frame 22 can rotate together with the rotating shaft 14 as a follower, and the magnet 21 can always remain stationary.
In any way, during the rotation of the rotating shaft 14, the winding on the framework 22 cuts the magnetic lines of force of the magnet 21 to generate an induced electromotive force, and the output end 23 of the winding outputs a first voltage signal, wherein the voltage value of the first voltage signal is directly proportional to the rotation speed of the rotating shaft 14.
The first voltage signal output by the output end 23 of the winding is used as the input of the signal processing module 30, the first voltage signal is converted by the a/D conversion module 31 to generate the second voltage signal, and the second voltage signal is output to the data processing module 32 for processing and correcting, so that at least one of the rotation speed and the rotation angle can be obtained. The data processing module 32 may be a Micro Controller Unit (MCU).
In the embodiment of the present invention, by providing the rotation parameter detecting device for the circuit breaker 10, when the rotating shaft 14 of the circuit breaker 10 rotates, the rotation sensing module 20 can rotate along with the rotating shaft 14 to generate a voltage signal, and the signal processing module 30 can calculate the rotation parameter of the rotating shaft 14 according to the voltage signal. Therefore, the embodiment of the utility model can realize the real-time detection of the rotation parameters of the circuit breaker 10.
In some embodiments, the data processing module 32 includes a rotation speed calculating unit and an integrating unit, wherein the rotation speed calculating unit calculates the rotation speed according to the second voltage signal, and the integrating unit integrates the second voltage signal to obtain the rotation angle.
In this embodiment, the data processing module 32 may perform the following two processes according to the second voltage signal: firstly, the rotating speed of the rotating shaft 14 can be calculated according to the second voltage signal, and secondly, the second voltage signal can be subjected to integral operation to obtain a voltage signal which is in direct proportion to the angle, so that the rotating angle of the rotating shaft 14 can be calculated. Thus, the data processing module 32 obtains the rotation speed and the rotation angle of the rotating shaft 14 at the same time.
In some embodiments, as shown in fig. 4, the a/D conversion module 31 includes a first input terminal, a second input terminal, a first output terminal and a second output terminal, the first input terminal is electrically connected to the output terminal 23 of the winding, and the first output terminal and the second output terminal are both electrically connected to the data processing module 32;
the signal processing module 30 further comprises an integrator 33, an input of the integrator 33 is electrically connected to the output 23 of the winding, an output of the integrator 33 is electrically connected to a second input,
the second voltage signal is output to the data processing module 32 via the first output end, and the data processing module 32 calculates the rotation speed according to the second voltage signal;
the integrator 33 integrates the first voltage signal to obtain a third voltage signal, the a/D conversion module 31 further converts the third voltage signal into a fourth voltage signal, the fourth voltage signal is output to the data processing module 32 via the second output end, and the data processing module 32 calculates the rotation angle according to the fourth voltage signal.
In this embodiment, on one hand, the first voltage signal may be converted by the a/D conversion module 31 and then output to the data processing module 32 for processing and correction, and at this time, the rotation speed of the rotating shaft 14 may be obtained; on the other hand, the first voltage signal can be converted into a voltage signal proportional to the angle by the integrator 33, and then converted by the a/D conversion module 31 and output to the data processing module 32 for processing and correction, so that the rotation angle of the rotating shaft 14 can be obtained. The method comprises the following specific steps:
according to the principle of electromagnetic induction, the magnetic lines of force generated by the permanent magnets 21 cut the windings to generate induced electromotive force. In the range of the rotation angle of the magnet 21, the magnetic flux of the winding is constant, the induced electromotive force is proportional to the rotation speed of the magnet 21, and the calculation formula related to the rotation speed of the magnet 21 is as follows:
E＝NBSv
wherein N is the number of turns of the winding, B is the magnetic induction, S is the cross-sectional area of the winding, and v is the relative movement velocity.
The electromotive force is integrated with time to obtain a reference quantity of the rotation angle in proportion to the rotation angle, and the calculation formula of the rotation angle is as follows:
δ＝c∫0 tE dt
and c is a rotation angle adjustment coefficient, and initialization calibration can be carried out according to actual measurement when the device leaves a factory.
Thus, the rotation speed and the rotation angle of the rotation shaft 14 are obtained at the same time.
After the rotation speed and the rotation angle of the rotating shaft 14 are obtained, the mechanical performance of the circuit breaker can be evaluated according to the rotation speed and the rotation angle of the rotating shaft 14.
In some embodiments, the data processing module 32 may also be electrically connected to the integrator 33, such that after one rotation of the shaft 14, the data processing module 32 may send an initialization control signal to the integrator 33 to initialize the integrator 33.
In some embodiments, the signal processing module 30 further includes a signal amplifier 34, and the input terminal of the a/D conversion module 31 is electrically connected to the output terminal 23 of the winding via the signal amplifier 34.
In this embodiment, the signal of the induced electromotive force is generally weak, that is, the first voltage signal is generally weak, and based on this, the signal amplifier 34 is provided to amplify the first voltage signal generated by the winding 23 to, for example, about 5V (-5V to 5V). In this embodiment, the first voltage signal is amplified, so that the accuracy and the sensitivity of the conversion, the processing and the correction of the subsequent voltage signal can be improved, and the detection accuracy of the rotation parameter of the rotating shaft 14 can be improved.
Other aspects of the rotation sensing module 20 are described below.
The rotation sensing module 20 includes a magnet 21 and a frame 22. The magnet 21 may be a single magnet 21 or a combination of a plurality of magnets 21. The magnetic pole surface of the magnet 21 may be a plane or an arc surface. The frame 22 may be a circular arc-shaped insulator, but is not limited to a circular arc shape, and may be formed by combining a plurality of segments of the frame 22. Taking the case of the circular arc of the frame 22, the central angle of the frame 22 determines the range of the detection angle, and generally, the central angle is not smaller than the maximum rotation angle of the rotating shaft 14, for example, the central angle may be 45 ° to 180 °. The winding may be formed by winding a wire with an insulating sheath around the bobbin 22, and the winding may be as uniform as possible.
In some embodiments, the magnet 21 is disposed on an end surface of the shaft 14, and a magnetic pole surface of the magnet 21 is perpendicular to the end surface of the shaft 14.
As an example, the magnetic pole surface where the N pole of the magnet 21 is located is parallel to the magnetic pole surface where the S pole is located, and the shape of the magnet 21 may be rectangular, but is not limited to rectangular. One of the magnetic pole faces of the magnet 21 is taken as the xy plane of a cartesian coordinate system, the center of the magnet 21 is taken as the origin of coordinates, and the z axis is perpendicular to the magnetic pole face of the magnet 21.
In this embodiment, the magnet 21 rotates as a follower with the shaft 14, and the bobbin 22 may remain stationary, e.g., the bobbin 22 may be disposed on some fixed bracket, or the bobbin 22 may be disposed on a housing of the circuit breaker 10, etc. The magnetic pole surface of the magnet 21 is perpendicular to the end surface of the rotating shaft 14, so that the direction of the magnetic force line of the magnet 21 changes along with the rotation of the rotating shaft 14, and the winding on the framework 22 cuts the magnetic force line of the magnet 21 to generate induced electromotive force.
In this embodiment, since the bobbin 22 can be kept stationary, the output end 23 of the winding can also be kept stationary, and the relative position between the winding and the signal processing module 30 can be kept unchanged as compared with the case where the bobbin 22 is provided on the end surface of the rotating shaft 14, which can improve the stability of the electrical connection between the output end 23 of the winding and the signal processing module 30, and thus can improve the overall stability of the rotational parameter detection apparatus.
In some embodiments, the central axis of rotation of the magnet 21 coincides with the central axis of rotation of the shaft 14. Thus, during the rotation of the shaft 14, the magnet 21 will not deflect, and the shaft 14 will not be subjected to the deflection force of the magnet 21, which is beneficial to keep the shaft 14 in a better working state.
In some embodiments, the central axis of the skeleton 22 coincides with the central axis of rotation of the magnet 21. In this way, the magnetic field intensity of the framework 22 does not change significantly due to the rotation of the magnet 21, and therefore, the magnetic flux of the winding does not change significantly due to the rotation of the magnet 21, which is beneficial to improving the detection accuracy of the rotation parameter of the rotating shaft 14.
In some embodiments, the shape of the backbone 22 is a circular arc, and the central angle of the backbone 22 is greater than or equal to 45 °. For example, the central angle of the skeleton 22 is 60 °, 90 °, 180 °, or the like.
In some embodiments, as shown in fig. 5, the bobbin 22 includes a first sub-bobbin 221 and a second sub-bobbin 222, the first and second sub-bobbins 221 and 222 are symmetrically disposed with respect to a rotation center axis of the magnet 21 as a symmetry axis, the first sub-bobbin 221 is wound with a first winding (not shown), and the second sub-bobbin 222 is wound with a second winding (not shown), and a winding direction of the first winding is opposite to a winding direction of the second winding.
The output 231 of the first winding and the output 232 of the second winding are both electrically connected to the signal processing module 30.
Since the first sub-bobbin 221 and the second sub-bobbin 222 are symmetrically disposed with the rotation center axis of the magnet 21 as a symmetry axis, the induced electromotive force generated by the first winding is equal to the induced electromotive force generated by the second winding, so that the output voltage signal can be enhanced, thereby facilitating improvement of the detection accuracy of the rotation parameter of the rotation shaft 14.
In some embodiments, the central angles of the first sub-bobbin 221 and the second sub-bobbin 222 are both 180 °, and the end of the first sub-bobbin 221 is connected with the end of the second sub-bobbin 222. In this way, the first sub-frame 221 and the second sub-frame 222 enclose the ring-shaped frame 22.
To sum up, in the embodiment of the present invention, by providing the rotation parameter detection device for the circuit breaker 10, when the rotating shaft 14 of the circuit breaker 10 rotates, the rotation sensing module 20 can rotate along with the rotating shaft 14 to generate a voltage signal, and the signal processing module 30 can calculate the rotation parameter of the rotating shaft 14 according to the voltage signal. Therefore, the embodiment of the utility model can realize the real-time detection of the rotation parameters of the circuit breaker 10.
As shown in fig. 1 to 5, an embodiment of the present invention further provides a circuit breaker 10, including:
a rotating shaft 14 for driving the movable contact 12 to move away from or close to the fixed contact 11; and
rotation parameter detection device.
It should be noted that, the implementation manner of the embodiment of the above-mentioned rotation parameter detection apparatus is also applicable to the embodiment of the circuit breaker 10, and can achieve the same technical effect, and for avoiding repetition, the details are not described herein again.
Other constructions and operations of the circuit breaker according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
It should be further noted that the rotation parameter detection device according to the embodiment of the present invention is not only suitable for a circuit breaker, but also suitable for other electrical products requiring detection of rotation parameters.
It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (10)
1. A rotation parameter detection device for a circuit breaker comprises a moving contact and a fixed contact, and further comprises a rotating shaft for driving the moving contact to move towards a direction far away from or close to the fixed contact; characterized in that, the rotation parameter detecting device includes:
the rotating sensing module comprises a magnet and a framework, wherein the framework is wound with a winding, one of the magnet and the framework is arranged on the end face of the rotating shaft, and the other of the magnet and the framework is arranged at intervals with the rotating shaft;
the signal processing module comprises an A/D conversion module and a data processing module, wherein the input end of the A/D conversion module is electrically connected with the winding, the output end of the A/D conversion module is electrically connected with the data processing module,
when the rotating shaft rotates, the magnet rotates relative to the framework, the winding outputs a first voltage signal, the A/D conversion module converts the first voltage signal into a second voltage signal and outputs the second voltage signal to the data processing module, the data processing module calculates according to the second voltage signal to obtain a rotation parameter, and the rotation parameter comprises at least one of rotating speed and rotating angle.
2. The rotational parameter detection device according to claim 1, wherein the a/D conversion module includes a first input terminal, a second input terminal, a first output terminal and a second output terminal, the first input terminal is electrically connected to the winding, and the first output terminal and the second output terminal are both electrically connected to the data processing module;
the signal processing module also comprises an integrator, the input end of the integrator is electrically connected with the winding, the output end of the integrator is electrically connected with the second input end,
the second voltage signal is output to the data processing module through the first output end, and the data processing module calculates to obtain the rotating speed according to the second voltage signal;
the integrator integrates the first voltage signal to obtain a third voltage signal, the A/D conversion module further converts the third voltage signal into a fourth voltage signal, the fourth voltage signal is output to the data processing module through the second output end, and the data processing module calculates to obtain a rotation angle according to the fourth voltage signal.
3. The rotational parameter detection apparatus according to claim 1, wherein the data processing module includes a rotational speed calculation unit and an integration unit, wherein,
the rotating speed calculating unit calculates to obtain a rotating speed according to the second voltage signal, and the integrating unit integrates the second voltage signal to obtain a rotating angle.
4. The rotational parameter detection device of claim 1, wherein the signal processing module further comprises a signal amplifier, and the input terminal of the a/D conversion module is electrically connected to the winding via the signal amplifier.
5. The rotational parameter detection device according to claim 1, wherein the magnet is provided on an end surface of the rotating shaft, and a magnetic pole surface of the magnet is perpendicular to the end surface of the rotating shaft.
6. The rotational parameter detection device according to claim 1, wherein a central axis of the skeleton coincides with a rotational central axis of the magnet.
7. The rotational parameter detection device according to claim 1, wherein the frame has a circular arc shape, and a central angle of the frame is greater than 45 °.
8. The rotational parameter detection device according to claim 1, wherein the bobbin includes a first sub-bobbin and a second sub-bobbin, the first sub-bobbin and the second sub-bobbin are symmetrically disposed with a rotational center axis of the magnet as a symmetry axis, the first sub-bobbin is wound with a first winding, the second sub-bobbin is wound with a second winding, and a winding direction of the first winding is opposite to a winding direction of the second winding.
9. The rotational parameter detection device according to claim 8, wherein the first sub-bobbin and the second sub-bobbin each have a central angle of 180 °, and an end of the first sub-bobbin is connected to an end of the second sub-bobbin.
10. A circuit breaker, comprising:
the rotating shaft is used for driving the moving contact to move away from or close to the fixed contact; and
the rotational parameter detection device according to any one of claims 1 to 9.
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| CN202121449896.3U CN215815750U (en) | 2021-06-28 | 2021-06-28 | Rotation parameter detection device for circuit breaker and circuit breaker |
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| CN202121449896.3U CN215815750U (en) | 2021-06-28 | 2021-06-28 | Rotation parameter detection device for circuit breaker and circuit breaker |
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