Sensor mounting seat for signal acquisition of three-phase induction motor

Abstract

The utility model relates to a sensor mounting seat for signal acquisition of a three-phase induction motor, and belongs to the technical field of state monitoring. Comprising a base, the upper surface of the base is provided with a first step, a second step and a third step which are symmetrical in shape and gradually increased in height, the first step is provided with a connecting groove, and the center line of the connecting groove coincides with the symmetry axis of the three steps. The device is simple in structure and convenient to install and operate, narrow space is utilized to the maximum extent through the multi-step structure, and the working process is optimized. Signals provided by a sensor are processed through the holographic spectrum technology, mechanical vibration signals of a motor rotor are combined with three-phase current signals, a brand new fault detection system is finally built, an existing detection system is simplified and optimized, the detection process is simplified, and the production cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of state monitoring, and in particular relates to a sensor mounting base for collecting signals of a three-phase induction motor. Background Art

[0002] A three-phase induction motor (AIM) is an AC motor that generates electromagnetic torque through the interaction between the rotating magnetic field formed by the stator winding and the magnetic field of the induced current in the rotor winding. However, three-phase induction motors are often exposed to harsh environments when performing variable load operations, making them prone to failure. Failure to predict and maintain these failures can result in significant losses. To overcome these issues, a condition monitoring system is required for real-time monitoring.

[0003] Non-intrusive machine current signature analysis (MCSA) technology has achieved breakthroughs in detecting electrical faults. However, existing condition monitoring technologies require the construction of a complex vibration sensor system, which is time-consuming and labor-intensive in practice. Furthermore, due to the varying sizes of rotating machines, the space available for sensor installation is limited, which affects sensor sensitivity and may result in erroneous readings and data collection during actual operation. Summary of the Invention

[0004] The purpose of the utility model is to provide a sensor mounting base for three-phase induction motor signal acquisition which has a simple structure and is easy to install and operate.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0006] A sensor mounting base for three-phase induction motor signal acquisition, characterized in that it includes a base, wherein a first step, a second step, and a third step are symmetrically shaped and gradually increase in height on the upper surface of the base, a connecting groove is formed on the first step, and the center line of the connecting groove coincides with the symmetry axis of the three steps;

[0007] A pair of connecting holes are symmetrically opened on the first step along the axis of symmetry, a pair of first mounting holes are symmetrically opened on the side wall of the second step along the axis of symmetry, and the angle between the axes of the two first mounting holes is 90°. A second mounting hole is opened on the side wall of the third step along the axis of the axis of symmetry, and a fourth step is further provided on the lower surface of the base in an inwardly concave shape.

[0008] Furthermore, threads are provided inside the first mounting hole and the second mounting hole.

[0009] The beneficial effects of the utility model are: simple structure, easy installation and operation, maximum utilization of narrow space through the multi-step structure, and optimization of work flow.

[0010] By processing the signals provided by the sensor through holographic spectrum technology, the mechanical vibration signal of the motor rotor is combined with the three-phase current signal, and finally a new fault detection system is built. The existing detection system is simplified and optimized, the detection process is simplified and production costs are reduced.

[0011] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a front structural schematic diagram of a sensor mounting base for three-phase induction motor signal acquisition according to an embodiment of the present invention;

[0013] Figure 2 This is a schematic diagram of the back structure of a sensor mounting base for three-phase induction motor signal acquisition according to an embodiment of the present invention;

[0014] Figure 3 This is a schematic diagram of the installation state of a sensor mounting base for three-phase induction motor signal acquisition according to an embodiment of the present invention;

[0015] Figure 4 This is a schematic diagram of an application of a sensor mounting base for three-phase induction motor signal acquisition according to an embodiment of the present invention;

[0016] Figure 5 This is a parameter diagram of a sensor mounting base for three-phase induction motor signal acquisition shown in an embodiment of the present invention.

[0017] Description of the accompanying drawings: 1. Connecting hole; 2. First step; 3. Second step; 4. First mounting hole; 5. Third step; 6. Second mounting hole; 7. Connecting groove; 8. Fourth step. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0021] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] See Figure 1-3 A sensor mounting base for three-phase induction motor signal acquisition shown in a preferred embodiment of the present application includes a base, and a first step 2, a second step 3 and a third step 5 with symmetrical shapes and gradually increasing heights are provided on the upper surface of the base. A connecting groove 7 is provided on the first step 2, and the center line of the connecting groove 7 coincides with the symmetry axis of the above-mentioned three steps. A pair of connecting holes 1 are symmetrically provided on the first step 2 along the symmetry axis, a pair of first mounting holes 4 are symmetrically provided on the side wall of the second step 3 along the symmetry axis, and the angle between the two first mounting holes 4 is 90°, a second mounting hole 6 is provided on the side wall of the third step 5 along the axis of the symmetry axis, and a fourth step 8 with an inward concave shape is provided on the lower surface of the base.

[0023] Furthermore, threads are provided in the first mounting hole 4 and the second mounting hole 6 .

[0024] Furthermore, the sensor mounting base is designed and manufactured by CREO modeling software and obtained by 3D printing, which is simple to manufacture and convenient to obtain.

[0025] Working principle:

[0026] Before starting work, the sensor mounting base shown in the utility model is set on the three-phase induction motor through the connecting groove 7 and connected to the three-phase induction motor through two connecting holes 1 and screws. Then, a photoelectric sensor for monitoring the motor rotor status signal is installed in the two mutually perpendicular first mounting holes 4, and a photoelectric sensor for monitoring the key phase signal is installed in the second mounting hole 6. A current sensor for monitoring the three-phase current is also provided on the three-phase circuit of the three-phase induction motor.

[0027] When the three-phase induction motor is running, the two photoelectric sensors in the first mounting hole 4 provide XY signals, and the photoelectric sensor in the second mounting hole 6 provides a Z signal. All of the above signals can be used through holographic spectrum technology to detect mechanical faults such as friction, cracks, and misalignment of the motor rotor.

[0028] Similarly, the three-phase current signals of the motor monitored by the current sensor are again processed by holographic spectrum technology to collect the three-phase current signals; since the rotor vibration signal caused by the mechanical failure of the induction motor has similar or identical characteristics to the waveform of the current signal, after conducting multiple groups of control experiments, the operating status of the three-phase induction motor can be monitored and judged in real time through the signal of the current sensor, and the mechanical failure of the motor can be detected.

[0029] Furthermore, the sensor mounting base shown in the present invention is removed, and electrical and mechanical faults are monitored only by current sensors, thus reducing production costs. Thus, the sensor mounting base optimizes the existing non-invasive machine current signature analysis technology and builds a new, simplified fault detection system. Figure 4 , the applicant has tested, verified and applied it on small motors and it is also applicable to medium-sized motors.

[0030] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0031] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A sensor mounting base for three-phase induction motor signal acquisition, characterized in that: The base comprises a first step, a second step and a third step having symmetrical shapes and gradually increasing heights, the first step having a connecting groove, the center line of which coincides with the symmetry axis of the three steps; A pair of connecting holes are symmetrically opened on the first step along the axis of symmetry, a pair of first mounting holes are symmetrically opened on the side wall of the second step along the axis of symmetry, and the angle between the axes of the two first mounting holes is 90°. A second mounting hole is opened on the side wall of the third step along the axis of the axis of symmetry, and a fourth step is further provided on the lower surface of the base in an inwardly concave shape.

2. The sensor mounting base for three-phase induction motor signal acquisition according to claim 1, characterized in that: Threads are provided inside the first mounting hole and the second mounting hole.

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