Iron core loss detection device and method for saturable reactor

Abstract

The invention relates to an iron core loss detection device and method for a saturable reactor. The device comprises a high-frequency power supply, a power analyzer, a universal meter, a first test winding and a second test winding, the high-frequency power supply is connected with the power analyzer, the power analyzer is connected with the first test winding, the second test winding is connected with the universal meter, and the device further comprises a lifting rod, a supporting mechanism and a lifting control mechanism. The first test winding and the second test winding are fixedly connected to the supporting mechanism and are arranged outside the lifting rod in a sleeving mode, the lifting rod penetrates through the supporting mechanism to be connected with the lifting control mechanism, and when the end of the lifting rod is connected with a to-be-tested iron core obtained in advance, the lifting control mechanism controls the lifting rod to descend. The iron core to be tested is located in the first test winding and the second test winding. Compared with the prior art, the method has the advantages of accurately calculating the unit loss of the iron core, rapidly screening the iron core with relatively stable heating according to the loss and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of core loss detection, and in particular to a core loss detection device and method for a saturated reactor. Background Art

[0002] A saturated reactor is a common circuit element. Its main function is to control the current in the circuit through its internal magnetic field, thereby achieving current limiting, filtering, voltage stabilization and other functions. The details are as follows: (1) Current limiting function: When the current in the circuit exceeds a certain value, the magnetic core will saturate, resulting in a decrease in the impedance of the saturated reactor, thereby limiting the flow of current; (2) Filtering function: The saturated reactor can filter the current and remove the high-frequency components in the current, thereby achieving the effect of improving the quality of the circuit signal and reducing the noise in the circuit; (3) Voltage stabilization function: The saturated reactor can maintain the circuit voltage stable by controlling the current in the circuit.

[0003] Reactor saturation is mainly caused by the saturation of the core in the reactor. Core saturation means that when the magnetic flux intensity in the reactor exceeds the core saturation flux density, the core will be saturated. At this time, the inductance value will decrease, and the hysteresis loss and eddy current loss in the core will increase significantly, and the temperature will rise. The decrease in inductance value will cause the current passing through the reactor in the AC circuit to increase, so that it cannot respond to the actual needs of the circuit, resulting in resonance and other problems. The increase in hysteresis loss and eddy current loss in the core will increase the heat generation of the reactor and increase the temperature. When in a high temperature environment for a long time, the oxidation rate of the reactor will increase, and the life of the reactor will also be affected. However, there is currently little research specifically on the detection of core loss for saturated reactors. How to quickly and accurately measure the core loss for saturated reactors, and then quickly screen high-quality cores for reactors, has become a problem that needs to be solved in this field. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for detecting the core loss of a saturated reactor in order to overcome the defect of the prior art that it is difficult to quickly and accurately measure the core loss of a saturated reactor.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] According to a first aspect of the present invention, there is provided a core loss detection device for a saturable inductor, comprising a high-frequency power supply, a power analyzer, a multimeter, a first test winding and a second test winding, wherein the high-frequency power supply is connected to the power analyzer, the power analyzer is connected to the first test winding, and the second test winding is connected to the multimeter, the device further comprises a lifting rod, a supporting mechanism and a lifting control mechanism, the first test winding and the second test winding are fixedly connected to the supporting mechanism and are respectively sleeved on the outside of the lifting rod, the lifting rod passes through the supporting mechanism and is connected to the lifting control mechanism, when the end of the lifting rod is connected to a pre-acquired core to be tested, the lifting control mechanism controls the lifting rod to descend, and the core to be tested is located inside the first test winding and the second test winding.

[0007] As a preferred technical solution, the supporting mechanism includes a supporting block and a supporting plate, the supporting block is fixedly connected to the bottom of the first test winding and the second test winding, the supporting plate is fixedly connected to the bottom of the supporting block, and the lifting rod passes through the supporting block and the support plate in sequence from top to bottom.

[0008] As a preferred technical solution, the device further includes a support rod and a base, and the support mechanism is fixedly connected to the base via the support rod.

[0009] As a preferred technical solution, a transverse groove is provided on the base, a force-receiving rod is inserted into the transverse groove, one end of the force-receiving rod inserted into the transverse groove is connected to a first spring, and the other end of the first spring is connected to the inner wall of the transverse groove.

[0010] As a preferred technical solution, a groove is provided at the bottom of the base, a suction cup is provided in the groove, and a surface of the suction cup is connected to one end of the force-bearing rod inserted in the transverse groove.

[0011] As a preferred technical solution, a plug-in hole is provided at one end of the lifting rod, and the plug-in hole is used for plugging in a pre-acquired iron core to be tested.

[0012] As a preferred technical solution, the lifting control mechanism includes a vertical rod, a rotating rod, a limit block and a limit plate with a limit groove, the vertical rod is fixedly connected to the end of the lifting rod close to the lifting control mechanism through a first connecting piece, the end of the vertical rod close to the supporting mechanism is movably connected to the rotating rod, the limit plate is fixedly connected to the bottom of the supporting mechanism through a second connecting piece, the rotating rod passes through the limit groove, the limit block is fixedly connected to the end of the rotating rod close to the supporting mechanism, and the cross-sectional shape of the limit groove is the same as the cross-sectional shape of the limit block.

[0013] As a preferred technical solution, the lifting control mechanism further includes an extension plate and a second spring, one side of the extension plate is fixedly connected to the vertical rod, and the other side of the extension plate is fixedly connected to the second spring.

[0014] As a preferred technical solution, the side surface of the extension plate is fixedly connected to the push block.

[0015] According to a second aspect of the present invention, there is provided a method for detecting core loss for a saturable inductor. The method is implemented based on the device and comprises the following steps: fixing a pre-acquired core to be tested to the end of the lifting rod; controlling the descent of the lifting rod by the lifting control mechanism; and when the core to be tested is located inside the first test winding and the second test winding, starting the high-frequency power supply, the power analyzer and the multimeter to perform loss detection on the core to be tested.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The loss detection device provided by the present invention, by setting a first test winding and a second test winding, uses a lifting control mechanism and a lifting rod to enable the iron core to be stably located inside the test winding, thereby realizing the measurement of the high-frequency loss per unit mass of the iron core, improving the accuracy of the iron core loss evaluation of the saturated reactor, and then quickly screening high-quality reactor iron cores according to the measured loss, that is, iron cores with relatively stable heating, thereby avoiding the risk of shortening the service life of the reactor due to accelerated oxidation in advance;

[0018] 2. The present invention stably connects the two ends of the iron core to be tested to the lifting column through the plug hole, and arranges a suction cup at the bottom of the base, which can be adsorbed on the desktop, and the end of the force-bearing rod is connected to the suction cup. When the lifting control mechanism drives the lifting rod to descend, the iron core to be tested moves to the inside of the test winding, and at the same time, the force-bearing rod moves horizontally in the horizontal groove, the first spring is squeezed, and the force-bearing rod moves to pull the suction cup, which can enhance the adsorption force of the suction cup and make the base more stably adsorbed on the desktop. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the device in Example 1 of the present invention;

[0020] Figure 2 It is a structural schematic diagram of a test winding and its associated components in Embodiment 1 of the present invention;

[0021] Figure 3 A schematic structural diagram of a test winding and its associated components from another perspective in Embodiment 1 of the present invention;

[0022] Figure 4 Schematic diagram of the cross-sectional structure of the test winding and its associated components in Embodiment 1 of the present invention;

[0023] Figure 5 It is a partial enlarged view of the structure of part A of the test winding and its associated components in Example 1 of the present invention;

[0024] Figure 6 It is a partial enlarged view of the structure of part B of the test winding and its associated components in Example 1 of the present invention;

[0025] Wherein: 1. high frequency power supply; 2. power analyzer; 3. multimeter; 4. first test winding; 5. second test winding; 6. lifting rod; 61. plug hole; 62. iron core to be tested; 71. supporting block; 72. supporting plate; 8. supporting rod; 9. base; 91. horizontal groove; 92. force rod; 93. first spring; 94. slot; 95. suction cup; 100. vertical rod; 101. rotating rod; 102. limit block; 103. limit groove; 104. limit plate; 105. arc rod; 106. extension plate; 107. second spring; 108. push block. DETAILED DESCRIPTION

[0026] Since there are few existing studies specifically for the detection of core loss for saturated reactors, in order to quickly and accurately measure the core loss for saturated reactors and then quickly screen high-quality reactors, the present invention provides a core loss detection device for saturated reactors, including a high-frequency power supply, a power analyzer, a multimeter, a first test winding and a second test winding, the high-frequency power supply is connected to the power analyzer, the power analyzer is connected to the first test winding, and the second test winding is connected to the multimeter. The device also includes a lifting rod, a support mechanism and a lifting control mechanism. The first test winding and the second test winding are fixedly connected to the support mechanism and are respectively sleeved on the outside of the lifting rod. The lifting rod passes through the support mechanism and is connected to the lifting control mechanism. When the end of the lifting rod is connected to the pre-obtained core to be tested, the lifting control mechanism controls the lifting rod to descend, and the core to be tested is located inside the first test winding and the second test winding. Based on the device, the present invention also provides a core loss detection method for saturated reactors, which can measure the high-frequency loss per unit mass of the core, and is helpful to accurately evaluate the performance of the core for the reactor.

[0027] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0028] Example 1

[0029] like Figure 1As shown, this embodiment provides a core loss detection device for a saturated reactor, including a high-frequency power supply 1, a power analyzer 2, a multimeter 3, a first test winding 4, a second test winding 5, two lifting rods 6, a support mechanism, and a lifting control mechanism. The high-frequency power supply 1 is connected to the power analyzer 2, the power analyzer 2 is connected to the first test winding 4, and the second test winding 5 is connected to the multimeter 3.

[0030] like Figure 2 As shown, the support mechanism includes a support block 71 and a support plate 72. The support block 71 is fixedly connected to the bottom of the first test winding 4 and the second test winding 5. The support plate 72 is fixedly connected to the bottom of the support block 71. The lifting rod 6 passes through the support block 71 and the support plate 72 from top to bottom, and can be lifted and lowered inside the support block 71. The entire detection device also includes a support rod 8 and a base 9. The support plate 72 is fixedly connected to the base 9 through the support rod 8. One end of the support rod 8 is fixedly connected to the bottom of the support plate 72, and the other end is fixedly connected to the base 9. One end of each lifting rod 6 is provided with a plug-in hole 61 and is elastic. The plug-in hole 61 is used to plug in the pre-acquired iron core 62 to be tested.

[0031] The first test winding 4 and the second test winding 5 are respectively sleeved on the outside of the two lifting rods 6. The two lifting rods 6 are connected to the lifting control mechanism through the supporting block 71 and the support plate 72. When the ends of the lifting rods 6 are connected to the iron core 62 to be tested, the lifting control mechanism controls the lifting rods 6 to descend, and the iron core 62 to be tested is located inside the first test winding 4 and the second test winding 5. The iron core 62 to be tested is U-shaped, and during testing, the two ends are respectively plugged into the plug holes 61 of the two lifting rods 6.

[0032] like Figure 3 to Figure 6 As shown, a transverse groove 91 is provided on the base 9, a force-receiving rod 92 is inserted into the transverse groove 91, and the force-receiving rod 92 can move in the transverse groove 91. One end of the force-receiving rod 92 inserted into the transverse groove 91 is fixedly connected to a first spring 93, and the other end of the first spring 93 is fixedly connected to the inner wall of the transverse groove 91. A slot 94 is provided at the bottom of the base 9, and a suction cup 95 is provided in the slot 94. The surface of the suction cup 95 is fixedly connected to one end of the force-receiving rod 92 inserted into the transverse groove 91. When the detection device is used, the suction cup 95 is adsorbed on the desktop, and the movement of the force-receiving rod 92 can drive the suction cup 95 to deform, thereby increasing the internal space of the suction cup 95 and increasing the suction force.

[0033] The specific structure of the lifting control mechanism and the specific way in which the lifting rod 6 passes through the supporting mechanism and is connected to the lifting control mechanism are as follows:

[0034] The lifting control mechanism includes a vertical rod 100, a rotating rod 101, a limit block 102, and a limit plate 104 with a limit groove 103. The vertical rod 100 is fixedly connected to one end of the lifting rod 6 close to the lifting control mechanism through a first connecting member (an arc rod 105 is used in this embodiment). Specifically, the ends of the two lifting rods 6 without the plug-in holes are fixedly connected through the arc rod 105, and the surface of the arc rod 105 is fixedly connected to the vertical rod 100, so that the arc rod 105 can be lifted and lowered with the lifting rod 6.

[0035] One end of the vertical rod 100 near the support plate 72 is movably connected to the rotating rod 101, and the rotating rod 101 can rotate at the end of the vertical rod 100. The limit plate 104 is fixedly connected to the bottom of the support plate 72 through the second connecting member. The rotating rod 101 passes through the limit slot 103. The limit block 102 is fixedly connected to one end of the rotating rod 101 near the support plate 72 and can rotate with the rotating rod 101. The cross-sectional shape of the limit slot 103 is the same as the cross-sectional shape of the limit block 102. The limit block 102 can be inserted into the limit slot 103, and the second connecting member is a vertical connecting rod, one end of which is fixedly connected to the upper surface of the limit plate 104, and the other end is fixedly connected to the bottom of the support plate 72, so that there is a gap between the limit plate 104 and the bottom of the support plate 72, and the gap can accommodate the limit block 102.

[0036] The lifting control mechanism also includes an extension plate 106 and a second spring 107. One side of the extension plate 106 is fixedly connected to the end of the vertical rod 100 away from the support plate 72, and the bottom is fixedly connected to the second spring 107. The extension plate 106 is lifted and lowered along with the vertical rod 100, and the side of the extension plate 106 is fixedly connected to two sets of push blocks 108. The other end of the second spring 107 is fixedly connected to the surface of the base 9, and the second spring 107 exerts a pulling force on the extension plate 106 toward the base 9. The push blocks 108 are lifted and lowered along with the extension plate 106. After the push blocks 108 are lowered, they are supported on the end of the force-bearing rod 92, so that the force-bearing rod 92 moves, thereby moving the suction cup 95 and increasing the suction force.

[0037] When actually testing, the output frequency of the high-frequency power supply 1 is 20KHz, and its output end is connected to the input end of the power analyzer 2, the output end of the power analyzer 2 is connected to the first test winding 4, the output end of the multimeter 3 is connected to the second test winding 5, and the two ends of the U-shaped test core 62 are respectively placed in the first test winding 4 and the second test winding 5. The principle of stably installing the test core 62 is as follows:

[0038] The two ends of the iron core 62 to be tested are inserted into the corresponding insertion holes 61, and the ends of the iron core 62 to be tested are stabilized in the corresponding insertion holes 61 respectively, and the rotating rod 101 is rotated so that the limit block 102 is aligned with the limit groove 103. Under the pull of the second spring 107, the vertical rod 100 drives the arc rod 105 to descend, and the arc rod 105 drives the lifting rod 6 to descend, so that the iron core 62 to be tested moves to the inside of the first test winding 4 and the second test winding 5, and the iron core 62 to be tested is stabilized in the test winding 4. Inside the winding, the extension plate 106 and the push block 108 descend along with the vertical rod 100. After the push block 108 descends, it is supported on the end of the force-bearing rod 92, so that the force-bearing rod 92 moves horizontally in the horizontal groove 91, and the first spring 93 is squeezed. A suction cup 95 is provided at the bottom of the base 9, and the suction cup 95 is adsorbed on the table. The end of the force-bearing rod 92 is connected to the suction cup 95. The force-bearing rod 92 moves to pull the suction cup 95, so that the adsorption force of the suction cup 95 is enhanced, so that the base 9 is more stably adsorbed on the table.

[0039] Example 2

[0040] Based on the detection device provided in Example 1, this embodiment provides a method for detecting core loss of a saturated reactor. The specific implementation process of the method is as follows:

[0041] 1. Build a test loop

[0042] Connect the high-frequency power supply, the power analyzer and the first test winding, as well as the second test winding and the multimeter. Insert the pre-obtained U-shaped iron core to be tested into the end of the lifting rod.

[0043] 2. Stably install the U-shaped core to be tested in the test winding

[0044] The lifting control mechanism is used to control the lifting rod to descend, and the lifting rod drives the U-shaped iron core to be tested to descend, so that the two ends of the U-shaped iron core to be tested are respectively moved to the inside of the first test winding and the second test winding and stabilized therein. At the same time, the descent of the lifting control mechanism supports the force-bearing rod, and the force-bearing rod moves horizontally to squeeze the first spring and pull the suction cup, thereby increasing the adsorption force of the suction cup and improving the stability of the detection device.

[0045] 3. High frequency loss detection

[0046] When the iron core to be tested is stably located inside the first test winding and the second test winding, the high-frequency power supply, the power analyzer and the multimeter are started to perform loss detection on the iron core to be tested.

[0047] The detection principle of core loss is as follows:

[0048] 1) Assuming that the area of ​​the core to be tested is S and the secondary voltage is U, calculate the secondary voltage value U according to the following formula:

[0049] U=k p ×N×Bm fS (1)

[0050] In the formula, k p is the waveform factor, N is the number of turns, B m is the magnetic induction intensity, f is the frequency, and S is the area.

[0051] 2) Install the core to be tested in the test winding, start the high-frequency power supply, output 20kHZ high frequency, and observe the voltage value displayed by the multimeter. When the displayed value is equal to the calculated secondary voltage value, the power analyzer will display the current current, voltage, frequency and actual power loss. Record the current actual power loss as P 实际 .

[0052] 3) Assume that the weight of the iron core being tested is W.

[0053] 4)Unit core loss:

[0054]

[0055] 5) In actual use, according to different standards, the relatively stable data is selected, and the assembled reactor core heats evenly (loss is usually dissipated in the form of heat), and the performance is better. For example:

[0056] The area of ​​the core 1 is S1 = 0.125 cm 2 , the actual mass W1 = 5.591kg, the calculated secondary voltage is U1 = 50.2V, and the actual loss P is obtained 实际1 =947W, then P 单位1 =169.38W / kg.

[0057] The area of ​​the core 2 is S2 = 0.124 cm 2 , the actual mass W2 = 5.607kg, the calculated secondary voltage is U2 = 49.7V, and the actual loss P is obtained 实际2 =865W, then P 单位2 =154.27W / kg.

[0058] …

[0059] The unit power loss of each core is calculated based on this. Assuming that the average unit power loss of these cores is 160W / kg, the selection standard is the data within ±10% of the average value of all unit core losses, that is, the cores with unit core losses in the range of 144 to 176 heat more evenly.

[0060] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A core loss detection device for a saturated reactor, characterized in that: The device comprises a high-frequency power supply, a power analyzer, a multimeter, a first test winding and a second test winding, wherein the high-frequency power supply is connected to the power analyzer, the power analyzer is connected to the first test winding, and the second test winding is connected to the multimeter. The device also comprises a lifting rod, a supporting mechanism and a lifting control mechanism, wherein the first test winding and the second test winding are fixedly connected to the supporting mechanism and are respectively sleeved on the outside of the lifting rod, the lifting rod passes through the supporting mechanism and is connected to the lifting control mechanism, and when the end of the lifting rod is connected to a pre-acquired iron core to be tested, the lifting control mechanism controls the lifting rod to descend, and the iron core to be tested is located inside the first test winding and the second test winding.

2. The core loss detection device for a saturable reactor according to claim 1, characterized in that: The supporting mechanism includes a supporting block and a supporting plate, the supporting block is fixedly connected to the bottom of the first test winding and the second test winding, the supporting plate is fixedly connected to the bottom of the supporting block, and the lifting rod passes through the supporting block and the supporting plate in sequence from top to bottom.

3. The core loss detection device for a saturable reactor according to claim 1, characterized in that: The device also includes a support rod and a base, and the support mechanism is fixedly connected to the base via the support rod.

4. The core loss detection device for a saturable reactor according to claim 3, characterized in that: A transverse groove is provided on the base, a force-receiving rod is inserted into the transverse groove, one end of the force-receiving rod inserted into the transverse groove is connected to a first spring, and the other end of the first spring is connected to the inner wall of the transverse groove.

5. The core loss detection device for a saturable reactor according to claim 4, characterized in that: A groove is formed at the bottom of the base, a suction cup is arranged in the groove, and a surface of the suction cup is connected to one end of the force bearing rod inserted in the transverse groove.

6. The core loss detection device for a saturable reactor according to claim 1, characterized in that: One end of the lifting rod is provided with a plug-in hole, and the plug-in hole is used for plugging in the pre-obtained iron core to be tested.

7. The core loss detection device for a saturable reactor according to claim 1, characterized in that: The lifting control mechanism includes a vertical rod, a rotating rod, a limit block and a limit plate with a limit groove, the vertical rod is fixedly connected to one end of the lifting rod close to the lifting control mechanism through a first connecting piece, the one end of the vertical rod close to the supporting mechanism is movably connected to the rotating rod, the limit plate is fixedly connected to the bottom of the supporting mechanism through a second connecting piece, the rotating rod passes through the limit groove, the limit block is fixedly connected to one end of the rotating rod close to the supporting mechanism, and the cross-sectional shape of the limit groove is the same as the cross-sectional shape of the limit block.

8. The core loss detection device for a saturable reactor according to claim 7, characterized in that: The lifting control mechanism also includes an extension plate and a second spring. One side of the extension plate is fixedly connected to the vertical rod, and the other side of the extension plate is fixedly connected to the second spring.

9. The core loss detection device for a saturable reactor according to claim 8, characterized in that: The side surface of the extension plate is fixedly connected to the pushing block.

10. A method for detecting core loss of a saturated reactor, characterized in that: The method is implemented based on the device according to any one of claims 1 to 9, and comprises the following steps: The pre-obtained iron core to be tested is fixedly connected to the end of the lifting rod; Using the lifting control mechanism to control the lifting rod to descend; When the iron core to be tested is located inside the first test winding and the second test winding, the high-frequency power supply, the power analyzer and the multimeter are started to perform loss detection on the iron core to be tested.

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