CN219122356U - Motor running state detection device based on higher harmonic electromagnetic radiation - Google Patents

Abstract

The utility model relates to a motor running state detection device based on higher harmonic electromagnetic radiation.A comparison antenna is arranged in the vertical 90-degree direction of a sampling antenna, the level of a non-contact signal and a contact signal is converted into mV level through a signal conditioner after the sampling antenna collects the motor electromagnetic signal, the level and the environmental background electromagnetic radiation signal received by the comparison antenna enter a short wave radio together for demodulation and differential coupling, the signals are converted into analog sound signals, the analog sound signals are output to a loudspeaker through a power amplifier to generate sound prompts with specific frequency, and the on-off and the rotating speed change of a motor are qualitatively and intuitively known according to the tone and the size of sound; or the short wave radio inputs the signals into the embedded single chip microcomputer for operation, and part of the signals are converted into digital signals through the analog-to-digital converter and are transmitted to the liquid crystal display screen for frequency and intensity parameter display; and the other part is uploaded to the quality inspection platform through a wireless transmitter by using WIFI and Bluetooth, or is connected with a wireless earphone for use.

Description

Motor running state detection device based on higher harmonic electromagnetic radiation

Technical Field

The utility model relates to a motor running state detection device, in particular to a motor running state detection device based on higher harmonic electromagnetic radiation.

Background

At present, a professional test system or a DCS system and the like are generally adopted in motor tests to detect various parameter indexes, various voltages, currents, resistance meters or sensors and the like are used in the processes of maintenance, overhaul and the like of the motor, so that the motor is not only various in equipment, frequent in switching and inconvenient to use, but also the measuring instrument, the sensor and the like are mostly required to be connected into a motor driving or controlling system, and wires, sensors, chips and the like are required to be manually assembled and disassembled, so that the motor is complex in operation and low in detection efficiency, the original use environment of the motor can be damaged, fault analysis is inaccurate, and other unstable factors are introduced; on the other hand, the current advanced motor remote operation and maintenance system has lower overall installation proportion due to higher cost, and particularly has far insufficient popularization degree for the conventional motor. There is a need for a portable handheld diagnostic device that can quickly determine the operating state of a motor without the need to disassemble the motor, and without contact (or external contact).

In industrial and living environments, when a motor of equipment is electrified and operated, particularly when variable frequency or PWM driving control is adopted, current in a coil not only can generate an alternating magnetic field, but also can emit electromagnetic radiation outwards, interference can be generated on radio signals frequently, the situation can be actively avoided in general, and the motor is prevented from generating interference and noise on the radio by adopting methods of shielding or keeping away and the like.

The utility model uses reverse thinking, and realizes non-contact detection of motor operation by utilizing the characteristic. Of course, in practical industrial application, only using a common radio circuit cannot meet the precision and discrimination of equipment detection requirements, so that a double-directional antenna differential coupling identification method and device are innovatively designed, electromagnetic harmonic signals with higher frequency are acquired by utilizing the frequency multiplication principle of Fourier series expansion of electromagnetic radiation, electromagnetic noise signal annihilation caused by surrounding environment is avoided, the detection range is further shortened, and the detection accuracy is improved.

Disclosure of Invention

The utility model aims to provide a motor running state detection device based on higher harmonic electromagnetic radiation, which can quickly determine the running state without disassembly in the scenes of motor test, maintenance, overhaul and the like, improves the working efficiency and reduces the detection workload; the device is a portable handheld diagnostic device.

In order to achieve the above purpose, the technical scheme of the utility model is as follows: the motor running state detection device based on the higher harmonic electromagnetic radiation comprises a sampling antenna and a comparison antenna, wherein the sampling antenna is arranged in the direction of 90 degrees perpendicular to the sampling antenna, the comparison antenna is used for receiving environmental background electromagnetic radiation signals, the level of the non-contact electromagnetic radiation signal and the level of the contact electromagnetic radiation signal are converted into mV (multiple-voltage) level through a signal conditioner after the sampling antenna collects the motor electromagnetic signals, then the non-contact electromagnetic radiation signal and the level of the contact electromagnetic radiation signal enter a shortwave radio together with the environmental background electromagnetic radiation signals received by the comparison antenna to be demodulated and differentially coupled, a higher harmonic signal collecting point is changed into an analog sound signal, the analog sound signal is output to a loudspeaker through a power amplifier to generate a sound prompt with specific frequency, and the on-off and the rotating speed change of a motor are qualitatively and intuitively known according to the tone and the size of sound; or the short wave radio inputs the signals into the embedded single chip microcomputer for operation, and part of the signals are converted into digital signals through the analog-to-digital converter and are transmitted to the liquid crystal display screen for frequency and intensity parameter display; and the other part is uploaded to the quality inspection platform through a wireless transmitter by using WIFI and Bluetooth, or is connected with a wireless earphone for use.

Further, the comparison antenna has the same parameters as the sampling antenna, including fixed frequency, signal gain and orientation angle.

Further, the motor operation state detection device further includes:

a front housing and a rear housing;

the main display screen is a digital display area and is used for displaying signal intensity and signal frequency or outputting motor state parameters after calculation according to motor parameter characteristics;

the display screen is an analog display area and is used for qualitatively displaying the signal intensity or voltage;

the auxiliary cancel key and the confirmation key are matched with the touch control of the display screen for use, and are used for switching various functions, so that the use stability is improved;

the power switch is a main power switch of the detection device;

a horn cover, which opens holes to release sound;

a frequency modulation knob which adjusts the sampling frequency by rotation;

gain knob, adjust signal to noise ratio and sound size.

Further, the front housing and the rear housing are made of engineering plastics, rubber or nonmetallic materials except engineering plastics and rubber, and are used for preventing the comparison antenna from receiving no external signals.

Further, the front shell and the rear shell are connected with the whole shell through fixing screws, a battery cover is arranged on the rear face of the whole shell to facilitate battery replacement, a rear sound outlet hole and a reverse hole are arranged up and down, and data and a charging port are arranged below the front shell and the rear shell.

Further, the data and the charging port are used as interfaces for USB wired data transmission, and meanwhile, the rechargeable lithium battery is charged.

The beneficial effects of the utility model are as follows:

the utility model innovatively designs a double-directional antenna differential coupling identification device, and utilizes the frequency multiplication principle of Fourier series expansion of electromagnetic radiation to collect electromagnetic harmonic signals with higher frequency, so that electromagnetic noise signals annihilation caused by surrounding environment is avoided, the detection range is further reduced, and the detection accuracy is improved.

Based on the core principle, the detection data can be displayed more intuitively through a series of circuits and an embedded system, the handheld design is convenient to move and use, meanwhile, the data can be detected by mass transfer on a digital platform such as WIFI, bluetooth and the like, the connection line is used as an edge sensor, the functions of the device are further integrated, and meanwhile, the device does not adopt a professional and expensive spectrum analyzer device, the product cost is quite low, and the device is suitable for popularization and use.

Drawings

FIG. 1 is a schematic diagram of differential coupling identification for a dual directional antenna;

in fig. 1: m-running motor, T-electromagnetic field radiation indication, A1-sampling antenna, A2-comparison antenna; FIG. 2 is a schematic diagram of a differential coupling identification spectrum;

in fig. 2: C-A1-sampling antenna spectrum, C-A2-comparing antenna spectrum, delta U-peak-differential coupling voltage identification point;

FIG. 3 is a schematic diagram of Fourier series expansion frequency multiplication of electromagnetic radiation;

in fig. 3: ΔU-peak-differential coupling voltage identification point, uac-higher harmonic signal acquisition point, LW-long wave frequency region, MW-medium wave frequency region, SW-short wave frequency region, noise zone-radio noise region, clean zone-radio silence region, F0-radio noise cut-off frequency;

FIG. 4 is a schematic diagram of the internal structure of the detection device;

in fig. 4: the wireless transmitter comprises an A1-sampling antenna, an A2-comparison antenna, a B-signal conditioner, a C-short wave radio, a D-power amplifier, an E-rechargeable lithium battery, an F-data and charging port, a G-loudspeaker, an H-liquid crystal display screen, a J-analog-to-digital converter, a K-embedded singlechip and an L-wireless transmitter;

FIG. 5 is a schematic diagram of the external structure of the detection device;

in fig. 5: (a) is the front side and (b) is the back side; 1-sampling antenna A1, 2-main display screen, 3-auxiliary display screen, 4-cancel key, 5-switch 6-horn cover, 7-frequency modulation knob, 8-gain knob, 9-confirm key, 10-front shell, 11-set screw, 12-battery cover, 13-back shell, 14-data and charge mouth F, 15-back sound outlet and reversing hole.

Detailed Description

The utility model will be further described with reference to the drawings and examples.

In the industrial environment, as shown in fig. 1, the sampling antenna A1 of the device is close to the motor M to be measured in operation, and the motor M emits electromagnetic field radiation T outwards at the moment, and the sampling antenna A1 is parallel to the electromagnetic field radiation T, so that the electromagnetic induction intensity is maximum and the signal receiving effect is best. However, in this case, electromagnetic radiation of other devices, radio stations and cosmic celestial bodies is distributed in the air, in order to improve the contrast and accuracy of sampling, a comparison antenna A2 is set in the vertical 90-degree direction of the sampling antenna A1, and parameters of the comparison antenna A2 are completely consistent with those of the sampling antenna A1, including fixed frequency, signal gain, directional angle and the like, and are used for receiving environmental background electromagnetic radiation, and due to the arrangement of 90 degrees, the comparison antenna A2 can be minimum for the electromagnetic radiation of the motor M, so that the subsequent differential coupling identification is used as a basis for signal discrimination.

After obtaining the sampling signals of each frequency of the sampling antenna A1 and the comparing antenna A2, the two signals are subjected to differential comparison in phase by a logic circuit, as shown in fig. 2, the amplitude of the comparing antenna spectrum C-A2 is subtracted from the corresponding frequency of the sampling antenna spectrum C-A1, so as to obtain a differential coupling spectrum shown by a shaded part in the middle, wherein the differential coupling voltage identification point deltau-peak with the largest amplitude is the signal point most relevant to the operation of the motor M. It should be noted that there may be a plurality of possibilities for the differential coupling voltage identification point Δu-peak, and a movement detection device is required to further check whether an interference signal of a similar motor exists, such as a separate cooling fan or an oil supply water supply auxiliary motor inside the main driving motor.

Since the input current frequency of the motor is generally low, even for a large motor with a large pole pair number, the electromagnetic radiation frequency is within 3000KHz, as shown in fig. 3, in this frequency range, the long wave frequency region LW and the medium wave frequency region MW are just the reason why the motor operation has a large interference to the radio. The long-wave frequency region LW is extremely susceptible to surface wave diffraction due to its low frequency and long wavelength, and the detection distance is too far from the discrimination-free region to be excluded. Therefore, when the test is started, the medium wave frequency area MW is selected first, the differential coupling voltage identification point delta U-peak signal intensity is highest, the signal acquisition is most facilitated, but after a plurality of tests, the frequency of the section is found to be easily influenced by broadcast signals, especially when radio stations are relatively close, radio station signals are stronger than motor signals in certain measuring directions, so that the differential coupling identification method of the dual directional antenna is invalid, and the radiation of the motor electromagnetic field cannot be accurately measured. At this time, in order to better applicability, the utility model selects the short wave frequency region SW with higher frequency, utilizes the frequency multiplication sampling principle that the electromagnetic radiation of the on-off step signal can be expanded on the corresponding integral-level series of Fourier, collects the higher harmonic signal collection point Uac with higher frequency and secondary signal amplitude, avoids the noise zone of the radio noise, and for indoor use, the short wave is not easy to penetrate the building after being reflected by the ionosphere, so the radio noise zone clean zone above the radio noise cut-off frequency F0 is selected, the signal amplitude is not the largest at this time, but the signal-to-noise ratio is the strongest, the detection range is further reduced, the detection accuracy is improved, the interference is reduced at the higher frequency, but the motor radiation signal is also reduced exponentially, and the detection contrast is still not easy to be increased. Of course, when used outdoors, the method may be subject to interference and influence from short-wave radio stations and cosmic radiation, but is already a relatively good technical route in general. In addition, in an outdoor scene, another solution idea is provided, the top end of the sampling antenna A1 is designed to be made of a metal conductive material, and can be directly contacted with the metal exposed part of the motor if necessary, and electromagnetic signals of the motor are directly measured by a method of equipotential of the detection device and the motor shell, so that the function of knowing the running state of the motor without disassembling the motor can be achieved.

Based on the core principle, detection data can be displayed more intuitively through a series of circuits and an embedded system, the handheld design is convenient to move and use, meanwhile, the data can be transmitted to a digital platform through WIFI, bluetooth and the like for mass transfer detection, the connection line is used as an edge sensor, the functions of the device are further integrated, fig. 4 is a typical detection device internal structure principle, the level of a non-contact signal and a contact signal is converted into mV level through a signal conditioner B after a sampling antenna A1 collects the electromagnetic signals of the motor, then the level is input into a shortwave radio C together with a comparison antenna A2, demodulation, differential coupling and the like are carried out, a higher harmonic signal collection point Uac is changed into an analog sound signal, a sound prompt with specific frequency can be generated for the analog signal part through a power amplifier D, and the on-off and rotating speed change of the motor can be known qualitatively and intuitively according to the tone and the size of sound, and the method is suitable for technicians with abundant experience; for the digital signal part, the radio signal enters the embedded single chip microcomputer K for operation, wherein the main part is converted into the digital signal through the analog-to-digital converter J, the digital signal is transmitted to the liquid crystal display screen H for displaying parameters such as frequency, intensity and the like, and the other part is uploaded to the quality inspection platform through the wireless transmitter L by using WIFI, bluetooth and the like, and the digital signal part can also be connected with a wireless earphone for use, so that the digital signal part is more suitable for novice and quantitative detection. The data and the charging port F can also be used as an interface for USB wired data transmission, and meanwhile, the rechargeable lithium battery E is charged, and the rechargeable lithium battery E supplies power to other modules. Wherein: circuits and embedded systems are state of the art.

In the external structural design of the detection device, as shown in fig. 5 (a) and (b), the sampling antenna 1 or A1 is exposed, so that the two purposes of contact measurement and non-contact measurement are facilitated, the main display screen 2 is a digital display area and mainly displays parameters such as signal intensity, signal frequency and the like, and can output motor state parameters such as on-off, rotating speed, acceleration, power and the like after calculation according to motor parameter characteristics, and the auxiliary display screen 3 is an analog display area and qualitatively displays signal intensity, voltage and the like. The cancel key 4 and the confirm key 9 can be matched with a display screen for touch control, and are used for switching various functions and improving the stability of industrial use. The power switch 5 is a total power switch of the detection device, the loudspeaker cover 6 is provided with a hole to release sound, the frequency modulation knob 7 can be rotated to adjust the sampling frequency, the typical numerical value is 3-30MHz, the gain knob 8 can be used for adjusting the signal to noise ratio and the sound size, the front shell 10 and the rear shell 13 are made of engineering plastics, rubber or other nonmetallic materials, the comparison antenna A2 is prevented from receiving external signals, the comparison antenna A2 is connected through the fixing screw 11, the reverse side of the device is provided with the battery cover 12 to facilitate the replacement of batteries, the rear sound outlet and the reverse hole 15 are arranged up and down, the data and the charging port 14 can be arranged below, and the external parts have certain waterproof, anti-falling and dustproof characteristics so as to adapt to industrial and outdoor high-strength use.

Variation of the utility model:

1) In addition to hand-held, desktop, cabinet or as part of a system;

2) Adopting 2 or more similar comparison antennas;

3) The display is performed by means of incandescent lamps, fluorescent lamps, LED lamps, laser lamps and the like.

Claims (6)

1. Motor running state detection device based on higher harmonic electromagnetic radiation, its characterized in that: the system comprises a sampling antenna (A1) and a comparison antenna (A2), wherein the sampling antenna (A1) is arranged in the vertical 90-degree direction and is provided with the comparison antenna (A2) for receiving an environmental background electromagnetic radiation signal, the sampling antenna (A1) is connected with a short wave radio (C) through a signal conditioner (B) and is used for converting the level of a non-contact signal and a contact signal into an mV level through the signal conditioner (B), the level of the non-contact signal and the level of the contact signal are then fed into the short wave radio (C) together with the environmental background electromagnetic radiation signal received by the comparison antenna (A2) to be demodulated and differentially coupled, a higher harmonic signal acquisition point (Uac) is changed into an analog sound signal, the short wave radio (C) is connected with a loudspeaker (G) through a power amplifier (D) and is used for outputting the analog sound signal to the loudspeaker (G) to generate a sound prompt with specific frequency, and the on-off and rotational speed change of the motor can be qualitatively and intuitively known according to the tone and the size of the sound; the short wave radio (C) converts a part of the signal input end into a digital signal through an analog-to-digital converter (J) and transmits the digital signal to the liquid crystal display screen (H) for displaying frequency and intensity parameters; and the other part is uploaded to the quality inspection platform through a wireless transmitter (L) by using WIFI and Bluetooth.

2. The motor operating state detection device based on higher harmonic electromagnetic radiation according to claim 1, wherein: the comparison antenna (A2) has the same parameters as the sampling antenna (A1), including fixed frequency, signal gain and orientation angle.

3. The motor operating state detection device based on higher harmonic electromagnetic radiation according to claim 1, wherein: the motor operation state detection device further includes:

a front housing (10) and a rear housing (13);

the main display screen (2) is a digital display area and is used for displaying signal intensity and signal frequency or outputting motor state parameters after calculation according to motor parameter characteristics;

the display screen (3) is an analog display area and is used for qualitatively displaying the signal intensity or voltage;

the auxiliary cancel key (4) and the confirmation key (9) are matched with the touch control of the display screen for use, and are used for switching various functions and improving the use stability;

the power switch (5) is a main power switch of the detection device;

a horn cover (6) with holes for releasing sound;

a frequency modulation knob (7) for adjusting the sampling frequency by rotation;

a gain knob (8) for adjusting the signal-to-noise ratio and the sound size.

4. A motor operating condition detection apparatus based on higher harmonic electromagnetic radiation as claimed in claim 3, wherein: the front housing (10) and the rear housing (13) are made of engineering plastics, rubber or nonmetallic materials except engineering plastics and rubber, and are used for preventing the comparison antenna (A2) from receiving external signals.

5. A motor operating condition detection apparatus based on higher harmonic electromagnetic radiation as claimed in claim 3, wherein: the front shell (10) and the rear shell (13) are connected with the integral shell through fixing screws (11), a battery cover (12) is arranged on the rear of the integral shell to facilitate replacement of a battery, a rear sound outlet hole and a reverse hole (15) are arranged up and down, and a data port (14) and a charging port (F) are arranged below the battery cover.

6. The motor operating state detection device based on higher harmonic electromagnetic radiation according to claim 5, wherein: the data port (14) and the charging port (F) are used as interfaces for USB wired data transmission, and meanwhile, the rechargeable lithium battery (E) is charged.

Images