CN217641773U - Narrow-band patch antenna for monitoring insulation PDIV of motor stator - Google Patents
Narrow-band patch antenna for monitoring insulation PDIV of motor stator Download PDFInfo
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- CN217641773U CN217641773U CN202221977210.2U CN202221977210U CN217641773U CN 217641773 U CN217641773 U CN 217641773U CN 202221977210 U CN202221977210 U CN 202221977210U CN 217641773 U CN217641773 U CN 217641773U
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Abstract
The utility model discloses a narrowband paster antenna for motor stator insulation PDIV monitoring, including the flexible medium basement that is the rectangle form that adopts polyimide PI material preparation to and inlay microstrip radiation piece and the mirror image floor of making by the copper sheet in flexible medium basement, wherein, the mirror image floor sets up in flexible medium basement one side edge, microstrip radiation piece is the rectangle strip to arrange along the central line of the flexible medium basement on perpendicular to mirror image floor, the one end and the flexible medium basement edge of this microstrip radiation piece flush, the other end and the mirror image floor keeps a feed clearance. The utility model discloses a to the flexible narrowband patch antenna of the rectangular strip shape of microstrip radiation piece and flexible medium basement structure, make the antenna laminate effectively and settle in inverter motor stator inner wall, make full use of space guarantees the detection effect, and the structure is succinct to realize more accurate motor stator PDIV test, and then promote motor insulation system's PDIV test accuracy.
Description
Technical Field
The utility model relates to a motor stator PDIV monitoring technology, specifically say, relate to a narrowband patch antenna that is used for motor stator insulation PDIV to monitor.
Background
The Partial Discharge (PD) phenomenon is an important factor for accelerating electrical aging of an insulation system of electrical equipment, and PD testing is an important means for finding potential insulation defects of the insulation system. At present, partial Discharge (PD) detection is carried out through electromagnetic signals radiated when coupling partial discharge occurs, and an ultrahigh frequency (UHF) test method is widely applied to field test of partial discharge. However, when a UHF sensor is used for performing online PD testing of a motor, low-frequency interference generated by a coupled square-wave pulse voltage source is very likely to occur, so that high requirements are placed on the signal-to-noise ratio and performance of a detection element, and the detection element is placed as close as possible to the vicinity of a stator winding of a variable-frequency motor so as to capture a first effective discharge signal. Thus, improvements are needed.
SUMMERY OF THE UTILITY MODEL
To the problem that above-mentioned prior art exists, the utility model provides a narrowband patch antenna for motor stator insulation PDIV monitoring has designed built-in flexible construction pertinence and has made patch antenna can effectively arrange in inverter motor stator to carry out the PDIV monitoring.
In order to realize the purpose, the utility model discloses a technical scheme as follows:
a narrow-band patch antenna for monitoring motor stator insulation PDIV (Primary insulated differential Power voltage) comprises a rectangular flexible medium substrate made of polyimide PI (polyimide) material, and a micro-strip radiation sheet and a mirror image floor which are embedded in the flexible medium substrate and made of copper sheets, wherein the thicknesses of the copper sheets of the micro-strip radiation sheet and the mirror image floor are 0.035mm, the thickness of the flexible medium substrate covering the upper surface of the copper sheet is 0.025mm, and the thickness of the flexible medium substrate covering the lower surface of the copper sheet is 0.1mm; the mirror image floor is arranged on one side edge of the flexible medium substrate, the microstrip radiation piece is in a rectangular strip shape and is arranged along the central line of the flexible medium substrate perpendicular to the mirror image floor, one end of the microstrip radiation piece is flush with the edge of the flexible medium substrate, the other end of the microstrip radiation piece and the mirror image floor keep a feed gap, and a feed line used for outputting detection signals is arranged in the feed gap.
Specifically, the length of the microstrip radiating patch is 65-70mm, the width of the microstrip radiating patch is 8mm, and the feed gap is 4mm, so that the resonant frequency of the narrow-band patch antenna is close to 1GHz.
Preferably, the length of the microstrip radiating patch is 67mm, and the resonant frequency of the narrowband patch antenna is 1GHz.
Specifically, the rectangular-shaped dimension of the flexible media substrate is 90mm x 100mm.
Specifically, when the bending curvature diameter of the narrow-band patch antenna is 3.1831-22 cm, the working frequency band is 0.7-1.2 GHz.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) The utility model discloses antenna to inverter motor stator insulation partial discharge detection used designs, constructs flexible narrowband paster antenna through the rectangle strip shape and the flexible medium basement to microstrip radiation piece, makes the antenna laminate effectively and settles in inverter motor stator inner wall, and make full use of space guarantees the detection effect to the structure is more succinct, thereby realizes more accurate motor stator PDIV test, and then promotes motor insulation system's PDIV test accuracy. The utility model discloses simple structure, design benefit, convenient to use is suitable for and uses in inverter motor stator PDIV detects.
(2) The utility model discloses control the length of microstrip radiation piece according to antenna design frequency channel to guarantee that antenna testing result's is stable accurate.
(3) The utility model discloses combine the antenna to carry out the control of curvature at the state that motor stator inner wall settled to guarantee that the testing result after the installation meets the requirements.
Drawings
Fig. 1 is a schematic front view of an embodiment of the present invention.
Fig. 2 is a schematic side view of an embodiment of the present invention.
Fig. 3 is a schematic diagram of return loss of an antenna with different curvatures according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of the antenna with a curvature diameter of 3.1831cm according to the embodiment of the present invention.
Fig. 5 is a schematic diagram of an embodiment of the present invention when the antenna has a curvature diameter of 22 cm.
Detailed Description
The present invention will be further described with reference to the following drawings and examples, and embodiments of the present invention include, but are not limited to, the following examples.
Examples
As shown in fig. 1 to 5, the narrow-band patch antenna for monitoring the motor stator insulation PDIV includes a rectangular flexible medium substrate 1 made of polyimide PI material, and a microstrip radiation patch 2 and a mirror image floor 3 embedded in the flexible medium substrate and made of copper sheets, wherein the thicknesses of the copper sheets of the microstrip radiation patch and the mirror image floor are 0.035mm, the rectangular size of the flexible medium substrate is 90mm × 100mm, so as to facilitate matching use of a specific application scene of the motor stator insulation PDIV monitoring, the thickness of the flexible medium substrate covering the upper surface of the copper sheet is 0.025mm, the thickness of the flexible medium substrate covering the lower surface of the copper sheet is 0.1mm, and the total thickness of the narrow-band patch antenna is 0.16mm, so that the narrow-band patch antenna can adapt to bending to a certain degree on the basis of ensuring performance, and improve environmental installation adaptability; the polyimide PI has the dielectric constant of 3.5, can resist high temperature of 400 ℃, has the long-term working temperature of-200-300 ℃, has high insulating property and is suitable for long-term working in the environment of an on-line running variable frequency motor.
The mirror image floor is arranged on one side edge of the flexible medium substrate, the microstrip radiation piece is in a rectangular strip shape and is arranged along the central line of the flexible medium substrate perpendicular to the mirror image floor, one end of the microstrip radiation piece is flush with the edge of the flexible medium substrate, the other end of the microstrip radiation piece and the mirror image floor keep a feed gap, and a feed line 4 used for outputting detection signals is arranged in the feed gap. Specifically, for the design of the length of the microstrip radiating patch, the length of the microstrip radiating patch is 65-70mm, so that the resonant frequency of the narrow-band patch antenna is about 1GHz. According to the design principle of a narrow-band antenna, based on the target condition that the resonant frequency is 1GHz, because the width of a microstrip radiating patch and the feed gap have relatively small influence on the antenna, the microstrip radiating patch and the feed gap are configured to be constant values in the embodiment, namely the width is 8mm, and the feed gap is 4mm, meanwhile, by designing the index of the length of the microstrip radiating patch, which mainly influences the performance of the antenna, the length L of the rectangular strip-shaped microstrip radiating patch in an ideal state is calculated to be 75mm by using one quarter of the wavelength of free space electromagnetic waves, and then simulation operation is performed by combining the dielectric constant of a PI frequency point flexible medium substrate and the design total thickness of the antenna, the resonant frequency point of the antenna is determined to be 1.03GHz when L =65mm, the resonant frequency point of the antenna is 0.97GHz when L =70mm, and the resonant frequency of the antenna is further determined to be 1GHz when L =67 mm.
Specifically, when the bending curvature diameter of the narrow-band patch antenna is 3.1831-22 cm, the working frequency band is 0.7-1.2 GHz. The utility model discloses combine the inside condition of settling of motor stator to antenna curvature diameter control analysis, and tested the four kinds of circumstances that curvature diameter is 3.1831cm, 14cm, 18cm and 22cm, wherein 3.1831cm is for curling into cylindrical sleeve pipe form with this narrowband patch antenna, as shown in fig. 4 and 5, return loss S11 performance test analysis under through this four kinds of circumstances, as shown in fig. 3, along with the reduction of curvature diameter, resonant frequency increases gradually, return loss S11 reduces gradually, under the most serious condition of deformation, antenna resonant frequency increases to 1.15GHz, nevertheless this frequency is still in the PD frequency domain scope of receipt.
The utility model discloses when using, not only can attach the antenna at the motor stator inner wall, also can attach at the motor stator outer wall, utilize flexible characteristic to carry out the PD coupling with its batching sleeve pipe cover on converter output high-voltage line even, so can realize receiving the PD signal that motor stator insulation system produced when the motor moves on line, carry out motor stator PD test more accurately. And still verified through the experiment the utility model discloses a narrow band patch antenna compares with external type archimedes helical antenna, and sensitivity is higher when this narrow band patch antenna is built-in, and received PD signal amplitude is external type archimedes helical antenna's 100 times at least to near field coupling can be the current signal on the antenna radiation transmission line with PD electromagnetic wave signal is whole to be converted. Consequently the utility model discloses a narrowband patch antenna has outstanding performance when carrying out the insulating PDIV monitoring of motor stator.
The above-mentioned embodiment is only the preferred embodiment of the present invention, and is not the limitation of the protection scope of the present invention, but all adopt the design principle of the present invention, and the changes made by performing non-creative work on this basis, all should belong to the protection scope of the present invention.
Claims (5)
1. The narrow-band patch antenna is characterized by comprising a rectangular flexible medium substrate made of polyimide PI materials, a micro-band radiation sheet and a mirror image floor, wherein the micro-band radiation sheet and the mirror image floor are embedded in the flexible medium substrate and made of copper sheets, the thickness of the copper sheets of the micro-band radiation sheet and the mirror image floor is 0.035mm, the thickness of the flexible medium substrate covering the upper surface of the copper sheet is 0.025mm, and the thickness of the flexible medium substrate covering the lower surface of the copper sheet is 0.1mm; the mirror image floor is arranged on one side edge of the flexible medium substrate, the microstrip radiating sheet is in a rectangular strip shape and is arranged along the central line of the flexible medium substrate perpendicular to the mirror image floor, one end of the microstrip radiating sheet is flush with the edge of the flexible medium substrate, the other end of the microstrip radiating sheet and the mirror image floor keep a feed gap, and a feed line used for outputting detection signals is arranged in the feed gap.
2. The narrow-band patch antenna for monitoring motor stator insulation PDIV (power injection parameter indicator) of claim 1, wherein the length of the microstrip radiating patch is 65-70mm, the width of the microstrip radiating patch is 8mm, and the feed gap of the microstrip patch is 4mm, so that the resonant frequency of the narrow-band patch antenna is about 1GHz.
3. The narrow-band patch antenna for motor stator insulation PDIV monitoring as claimed in claim 2, wherein the length of the microstrip radiating patch is 67mm, and the resonant frequency of the narrow-band patch antenna is 1GHz.
4. The narrow band patch antenna for motor stator insulation PDIV monitoring of claim 3, wherein the rectangular shaped dimension of the flexible dielectric substrate is 90mm x 100mm.
5. The narrow-band patch antenna for monitoring the insulation PDIV of the motor stator according to any one of claims 1 to 4, wherein the operating frequency band is 0.7 to 1.2GHz when the bending curvature diameter of the narrow-band patch antenna is 3.1831 to 22 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221977210.2U CN217641773U (en) | 2022-07-29 | 2022-07-29 | Narrow-band patch antenna for monitoring insulation PDIV of motor stator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221977210.2U CN217641773U (en) | 2022-07-29 | 2022-07-29 | Narrow-band patch antenna for monitoring insulation PDIV of motor stator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217641773U true CN217641773U (en) | 2022-10-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221977210.2U Active CN217641773U (en) | 2022-07-29 | 2022-07-29 | Narrow-band patch antenna for monitoring insulation PDIV of motor stator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217641773U (en) |
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2022
- 2022-07-29 CN CN202221977210.2U patent/CN217641773U/en active Active
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