CN117497283B - Energy storage oscillation type transformer demagnetizing device - Google Patents
Energy storage oscillation type transformer demagnetizing device Download PDFInfo
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- CN117497283B CN117497283B CN202311771550.9A CN202311771550A CN117497283B CN 117497283 B CN117497283 B CN 117497283B CN 202311771550 A CN202311771550 A CN 202311771550A CN 117497283 B CN117497283 B CN 117497283B
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- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
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Abstract
The invention provides a demagnetizing device and method for an energy-storage oscillating transformer, belonging to the technical field of transformer demagnetization; comprising the following steps: the box body is internally provided with a power supply module, an energy storage module, a control circuit board and an operation panel; the operation panel is provided with a display screen, a wiring terminal, an adjusting knob and an indicator lamp; the control circuit board comprises a data acquisition module, a display module and a control module, wherein the output end of the power module is connected with the adjustable boosting module, the adjustable boosting module is connected with the data acquisition module and the charging control module, the output end of the charging control module is connected with the energy storage module, and the output end of the energy storage module is connected with the demagnetizing control module; the output end of the data acquisition module is connected with the control module, and the adjustable boosting module, the charging control module and the demagnetizing module are connected with the control module. The demagnetizing method of the invention uses pulse power to replace continuous power, uses LC oscillation to replace frequent switching of an electronic switch, has simple control structure and convenient operation, and obviously improves the demagnetizing speed.
Description
Technical Field
The invention relates to the technical field of preventive tests for lean overhaul of large converter transformer, in particular to an energy storage oscillating type transformer demagnetizing device, and aims at solving the problem of long time for eliminating residual magnetism defects of an extra-high voltage converter transformer core.
Background
Large transformers such as a converter transformer and the like can remain residual magnetism in an iron core after switching off, direct current resistance measurement and on-load tap changer characteristic test are carried out, so that the transformer is saturated in the iron core in the subsequent switching-on process, excitation inrush current is induced, and misoperation of a relay protection device is caused.
The existing demagnetizing technology mainly integrates two types of constant-frequency amplitude variation and variable-frequency constant-amplitude variation, and uses a power electronic switch to control the amplitude and frequency of excitation so as to construct continuous excitation with a gradual attenuation of amplitude and second product. The electronic switch control frequency of the demagnetizing mode is not adjustable, the excitation amplitude is not variable, and the cost of demagnetizing time is high.
Therefore, there is a need for an energy storage oscillating type transformer demagnetizing device capable of rapidly eliminating the residual magnetism defect of the extra-high voltage converter transformer core.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the demagnetizing device for the energy storage oscillating type transformer, which improves the demagnetizing efficiency and the demagnetizing effect.
The aim of the invention can be achieved by adopting the following technical scheme:
The invention provides a demagnetizing device of an energy storage oscillating transformer, comprising:
The box body is provided with a box body,
A power supply module, an energy storage module, a control circuit board and an operation panel are arranged in the box body; the display screen, the wiring terminal, the adjusting knob and the indicator lamp are arranged on the operation panel;
the control circuit board comprises a data acquisition module, a display module and a control module,
The output end of the power supply module is connected with the adjustable boosting module, the adjustable boosting module is connected with the data acquisition module and the charging control module, the output end of the charging control module is connected with the energy storage module, and the output end of the energy storage module is connected with the demagnetizing control module;
the output end of the data acquisition module is connected with the control module, and the adjustable boosting module, the charging control module and the demagnetizing module are connected with the control module; the output end of the control module is connected with the display module;
The energy-storage oscillation type transformer demagnetizing device uses pulse power to replace continuous power and uses LC oscillation to replace an electronic switch to switch frequently, wherein the energy-storage oscillation type transformer demagnetizing method comprises four stages of wiring preparation, voltage selection, capacitor energy storage and excitation demagnetization; the method specifically comprises the following steps:
disconnecting leads at the net side and the valve side of the converter transformer, and connecting a demagnetizing device with a winding at the net side of the converter transformer;
Operating the demagnetizing device to select an excitation voltage;
charging an energy storage module inside the demagnetizing device to an excitation voltage;
closing a loop switch of the demagnetizing device, releasing energy to a transformer core winding by an energy storage module, and opening the loop switch to finish excitation demagnetization when the loop current oscillation is attenuated to be below 10 mA;
The circuit switch of the demagnetizing device is closed, the energy storage module releases energy to the transformer core winding, and when the oscillation of the circuit current is reduced to below 10mA, the circuit switch is opened to complete excitation and demagnetization, specifically:
The loop switch of the demagnetizing device is closed, an oscillating circuit is formed by the inductance of the energy storage capacitor and the iron core of the transformer, the loop current is smaller than 10mA after the damping oscillation, and the loop switch is opened to finish excitation demagnetization after the measured current lasts for 20ms and smaller than 10 mA; the demagnetizing process is a series of exchange of energy storage capacitor and iron core inductance energy, and specifically comprises the following steps:
The first stage: the winding voltage and the loop current change slowly, the iron core flux linkage changes rapidly, and the iron core magnetic field is gradually enhanced to saturation at the moment;
And a second stage: the winding voltage and the loop current change rapidly, the iron core flux linkage changes slowly, at the moment, the polarity of the electric field of the capacitor is reversed, and the redundant energy is fed back to the capacitor and stored;
And a third stage: as in the first stage, the core magnetic field changes greatly and the polarity of the core magnetic field is reversed;
Fourth stage: as with the second stage, the capacitor electric field is reversed in polarity.
As a further technical scheme of the invention, an overvoltage protector is also arranged between the energy storage module and the charging control module.
As a further technical scheme of the invention, the energy storage module is an energy storage capacitor.
According to the invention, the lifting handle and the telescopic pull rod are arranged on the box body, and the movable wheels are arranged at the bottom of the box body.
The invention further adopts the technical scheme that the leads at the net side and the valve side of the converter transformer are disconnected, and a demagnetizing device is connected with the winding at the net side of the converter transformer; the method specifically comprises the following steps:
Disconnecting the leads at the net side and the valve side of the converter transformer, keeping the net side winding and the valve side winding in an open state, connecting the net side winding of the tested converter transformer with a demagnetizing device by using a test wire, connecting a high-voltage wiring terminal of the converter transformer net side winding with a positive polarity wiring terminal of the demagnetizing device, and connecting the high-voltage wiring terminal of the converter transformer net side winding with a negative polarity wiring terminal of the demagnetizing device.
The further technical scheme of the invention is that the voltage of the demagnetizing device is selected to excite the voltage; the method specifically comprises the following steps:
Calculating excitation voltage U 0 according to the no-load power P 0 and no-load current I 0 of the converter transformer of the object by using an equation shown in the formula (1);
According to the technical scheme, the demagnetizing device charges an energy storage module through an adjustable boosting module to an excitation voltage U 0; the method specifically comprises the following steps:
The demagnetizing device boosts through the adjustable boosting module, and outputs direct-current voltage to charge the energy storage module to the excitation voltage U 0 through controlling the triggering angle of the semi-control rectifying circuit.
The commercial power booster circuit of the demagnetizing device boosts 220V commercial power to 3.0kV, and realizes 200V to 2000V direct current output by controlling the trigger angle of the semi-controlled rectifying circuit, and charges the capacitor energy storage.
Compared with the prior art, the invention has the following beneficial effects:
The invention uses pulse power to replace continuous power, uses LC oscillation to replace electronic switch to switch frequently, the energy oscillation frequency of the energy storage capacitor and the transformer core is completely matched with the transformer core, which is the optimal frequency of the demagnetizing process, and the demagnetizing amplitude is derived from the no-load power of the transformer core and is also well matched with the transformer core, so compared with other demagnetizing methods, the invention has better adaptability, faster demagnetizing speed and higher demagnetizing efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a diagram showing a structure of a demagnetizing device of an energy-storing oscillating transformer according to the present invention;
Fig. 2 is a side view of a demagnetizing device structure of an energy-storing oscillating transformer according to the present invention;
FIG. 3 is a diagram showing a control structure of a demagnetizing device of an energy-storing oscillating transformer according to the present invention;
FIG. 4 is a circuit diagram of a power supply module according to the present invention;
FIG. 5 is a flowchart of a method for demagnetizing an energy-storing oscillating transformer according to the present invention;
FIG. 6 is a schematic diagram of the excitation demagnetizing process according to the present invention;
fig. 7a is a schematic diagram illustrating excitation of a demagnetization method of an energy-storage oscillating transformer according to the present invention;
fig. 7b is a schematic diagram illustrating excitation of a demagnetization method of an energy storage oscillating transformer according to the present invention;
10-a box body, 20-a power module, 30-an energy storage module, 40-a control circuit board and 50-an operation panel; 60-adjustable boost module, 70-charge control module, 80-demagnetizing control module, 90-overvoltage protector;
101-handles, 102-telescopic pull rods and 103-movable wheels; 201-sine generator, 202-signal follower, 203-drive signal isolator, 204-voltage and frequency regulation module, 205-booster; 401-a data acquisition module, 402-a display module, 403-a control module; 501-display screen, 502-binding post, 503-adjust knob, 504-pilot lamp.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present application are within the scope of protection of the present application. It should be understood that the detailed description is intended to illustrate the application, and is not intended to limit the application.
Referring to fig. 1 to 4, the present invention provides a demagnetizing device for an energy storage oscillating transformer, comprising:
the housing (10) is provided with a housing,
The power module 20, the energy storage module 30, the control circuit board 40 and the operation panel 50 are arranged in the box body 10; a display screen 501, a wiring terminal 502, an adjusting knob 503 and an indicator lamp 504 are arranged on the operation panel 50;
the control circuit board 40 comprises a data acquisition module 401, a display module 402 and a control module 403;
The output end of the power supply module 20 is connected with the adjustable boosting module 60, the adjustable boosting module 60 is connected with the data acquisition module 401 and the charging control module 70, the output end of the charging control module 70 is connected with the energy storage module 30, and the output end of the energy storage module 30 is connected with the demagnetizing control module 80;
The output end of the data acquisition module 401 is connected with the control module 403, and the adjustable boosting module 60, the charging control module 70 and the demagnetizing module 80 are connected with the control module 403; the output end of the control module 403 is connected with the display module 402.
In the embodiment of the invention, the demagnetization of the remanence of the converter transformer is realized by arranging the demagnetization device, the demagnetization is realized by charging the transformer through the energy storage module, particularly, the commercial power is boosted through the adjustable boosting module, then the energy storage module stores energy, and then the energy storage module supplies power to control the demagnetization control module to perform charging demagnetization; the invention realizes demagnetizing operation through LC oscillation, the oscillation frequency is completely matched with the transformer core, the optimal frequency in the demagnetizing process is realized, the demagnetizing amplitude is derived from the no-load power of the transformer core and is also completely matched with the transformer core, so that compared with other demagnetizing methods, the invention has better adaptability, higher demagnetizing speed and higher demagnetizing efficiency.
In order to protect the energy storage module, an overvoltage protection 90 is also provided between the energy storage module 30 and the charge control module 70. In an embodiment of the present invention, the energy storage module 30 is a storage capacitor.
Referring to fig. 4, in the embodiment of the present invention, the power module 20 includes a sine generator 201, a signal follower 202, a driving signal isolator 203, a voltage and frequency regulation module 204, and a booster 205, where an output end of the sine generator 201 is connected to the signal follower 202, an output end of the signal follower 202 is connected to the driving signal isolator 203, an output end of the driving signal isolator 203 is connected to the voltage and frequency regulation module 204, and an output end of the voltage and frequency regulation module 204 is connected to the booster 205. The sine generator 201 is connected to a control module 403.
For convenient movement and transportation, a handle 101 and a telescopic pull rod 102 are arranged on the box body 10, and a moving wheel 103 is arranged at the bottom of the box body 10.
Referring to fig. 5, the present invention further provides a demagnetization method of an energy storage oscillating transformer, including:
step S1, disconnecting leads at the net side and the valve side of the converter transformer, and connecting a demagnetizing device with a winding at the net side of the converter transformer;
Step S2, operating the demagnetizing device to select an excitation voltage;
step S3, an energy storage module in the demagnetizing device is charged to an excitation voltage;
And S4, closing a loop switch of the demagnetizing device, releasing energy to a transformer core winding by the energy storage module, and opening the loop switch to finish excitation demagnetization when the loop current oscillation is reduced to below 10 mA.
In the embodiment of the invention, when the specific operation is performed, firstly, the leads at the net side and the valve side of the converter transformer are disconnected, the demagnetizing device is connected with the net side winding of the converter transformer, the exciting voltage is regulated on the operation panel as output to charge the energy storage module, the loop switch of the demagnetizing device is closed to discharge the iron core winding of the transformer, and after the discharge is completed, the loop switch is opened to complete demagnetization.
In the embodiment of the invention, the leads at the net side and the valve side of the converter transformer are disconnected, and a demagnetizing device is connected with the winding at the net side of the converter transformer; the method specifically comprises the following steps:
Disconnecting the leads at the net side and the valve side of the converter transformer, keeping the net side winding and the valve side winding in an open state, connecting the net side winding of the tested converter transformer with a demagnetizing device by using a test wire, connecting a high-voltage wiring terminal of the converter transformer net side winding with a positive polarity wiring terminal of the demagnetizing device, and connecting the high-voltage wiring terminal of the converter transformer net side winding with a negative polarity wiring terminal of the demagnetizing device.
Wherein, the voltage of the demagnetizing device is selected to excite the voltage; the method specifically comprises the following steps:
Calculating excitation voltage U 0 according to the no-load power P 0 and no-load current I 0 of the converter transformer of the object by using an equation shown in the formula (1);
in the embodiment of the invention, the demagnetizing device charges the energy storage module through the adjustable boosting module, and the method specifically comprises the following steps:
the demagnetizing device boosts through the adjustable boosting module, and outputs direct-current voltage to charge the energy storage module by controlling the trigger angle of the semi-control rectifying circuit.
The commercial power booster circuit of the demagnetizing device boosts 220V commercial power to 3.0kV, and realizes 200V to 2000V direct current output by controlling the trigger angle of the semi-controlled rectifying circuit, and charges the capacitor energy storage.
The invention further adopts the technical scheme that a loop switch of the demagnetizing device is closed, an energy storage module releases energy to a transformer iron core winding, loop current oscillation is reduced to below 10mA, and the loop switch is opened to finish excitation demagnetization, specifically:
The loop switch of the demagnetizing device is closed, the energy storage module releases energy to the transformer core winding, and after the measured current lasts for 20ms to be less than 10mA, the loop switch is opened to finish excitation demagnetization.
As shown in fig. 6, the demagnetizing process is the exchange of energy between the energy storage capacitors of the columns and the core inductance. In the process of the number 1, the winding voltage and the loop current change slowly, the iron core flux linkage changes rapidly, and the iron core magnetic field is gradually enhanced to saturation; in the process of the number 2, the winding voltage and the loop current change rapidly, the iron core flux linkage changes slowly, the polarity of the electric field of the capacitor is reversed, and the redundant energy is fed back to the capacitor and stored; the process with the number 3 is the same as the process with the number 1, the iron core magnetic field is greatly changed, and the polarity of the iron core magnetic field is reversed; the process numbered 4 is the same as the process numbered 2 in that the polarity of the capacitor electric field is reversed.
The mains supply boosting circuit is connected with the half-control rectifying circuit and is used for boosting 220V mains supply to 3.0kV through a transformer; the semi-control rectifying circuit is connected between the mains supply boosting circuit and the energy storage capacitor, is controlled by the control computer, and is used for adjusting the trigger angle under the control instruction of control calculation to form direct-current voltage meeting the excitation voltage U 0; the energy storage capacitor is connected between the semi-controlled rectifying circuit and the loop switch, is connected in parallel with the semi-controlled rectifying circuit and is used as a core element of the energy storage type demagnetizing device, the energy storage capacitor and the converter transformer exciting inductor form an LC oscillating loop, the function of establishing a magnetic field is carried out when the converter transformer core is not saturated, the task of energy recovery is carried out after the converter transformer core is saturated, the demagnetization is started after the energy storage capacitor is charged to an exciting voltage U 0, and the demagnetization is ended after the current of the energy storage capacitor is continuously less than 10mA for 20 ms; the loop switch is connected in series between the energy storage capacitor and the voltage and current measuring circuit and is used for controlling the opening and closing of the demagnetizing circuit; the voltage and current measuring circuit is connected in series between the loop switch and the connecting terminal and has data interaction with the control computer, and the function of measuring and evaluating the working state of the demagnetizing circuit is realized; the connecting terminal is a connection butt joint part of the demagnetizing device and the converter transformer winding.
And (3) taking a certain converter transformer with the model number of ZZDFPZ-405200/500-600 as a demagnetizing object, and eliminating the residual magnetism defect of the iron core by using an energy storage type demagnetizing device. The converter transformer no-load power P 0 is 95.6kW, the no-load current I 0 is 1.41A, and the calculated excitation voltage U 0 is about 1.0kV.
The voltage-voltage curves for the two demagnetizing are shown in fig. 7a and 7b, and the voltage-current during the demagnetization is shown in table 1:
TABLE 1
| Demagnetizing sequence number | Voltage value | Current value | Voltage termination value | End value of current |
| 1 | 930V | 5114mA | 5.4V | -5mA |
| 2 | 920V | 1123mA | 1.7V | -8mA |
And the comparison is made by using the existing constant frequency variable pressure type demagnetizing device in the market, referring to table 2, the two devices have basically consistent low-pressure load current after demagnetization, so the energy storage type converter transformer demagnetizing device has the consistent performance with the constant frequency variable pressure type demagnetizing device, but the demagnetizing time is shorter, and is generally less than 3min.
TABLE 2
The various modifications and specific examples of the method in the foregoing embodiment are equally applicable to an energy storage oscillating type transformer demagnetizing device in this embodiment, and those skilled in the art will clearly know about an energy storage oscillating type transformer demagnetizing device in this embodiment through the foregoing detailed description of an energy storage oscillating type transformer demagnetizing method, so that the details thereof will not be described herein for brevity.
The present invention has been described in detail above, but the present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. Many other changes and modifications may be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (8)
1. An energy storage oscillating transformer demagnetizing device, characterized by comprising:
The box body is provided with a box body,
A power supply module, an energy storage module, a control circuit board and an operation panel are arranged in the box body; the display screen, the wiring terminal, the adjusting knob and the indicator lamp are arranged on the operation panel;
the control circuit board comprises a data acquisition module, a display module and a control module,
The output end of the power supply module is connected with the adjustable boosting module, the adjustable boosting module is connected with the data acquisition module and the charging control module, the output end of the charging control module is connected with the energy storage module, and the output end of the energy storage module is connected with the demagnetizing control module;
the output end of the data acquisition module is connected with the control module, and the adjustable boosting module, the charging control module and the demagnetizing module are connected with the control module; the output end of the control module is connected with the display module;
The energy-storage oscillation type transformer demagnetizing device uses pulse power to replace continuous power and uses LC oscillation to replace an electronic switch to switch frequently, wherein the energy-storage oscillation type transformer demagnetizing method comprises four stages of wiring preparation, voltage selection, capacitor energy storage and excitation demagnetization; the method specifically comprises the following steps:
disconnecting leads at the net side and the valve side of the converter transformer, and connecting a demagnetizing device with a winding at the net side of the converter transformer;
Operating the demagnetizing device to select an excitation voltage;
charging an energy storage module inside the demagnetizing device to an excitation voltage;
closing a loop switch of the demagnetizing device, releasing energy to a transformer core winding by an energy storage module, and opening the loop switch to finish excitation demagnetization when the loop current oscillation is attenuated to be below 10 mA;
The circuit switch of the demagnetizing device is closed, the energy storage module releases energy to the transformer core winding, and when the oscillation of the circuit current is reduced to below 10mA, the circuit switch is opened to complete excitation and demagnetization, specifically:
The loop switch of the demagnetizing device is closed, an oscillating circuit is formed by the inductance of the energy storage capacitor and the iron core of the transformer, the loop current is smaller than 10mA after the damping oscillation, and the loop switch is opened to finish excitation demagnetization after the measured current lasts for 20ms and smaller than 10 mA; the demagnetizing process is a series of exchange of energy storage capacitor and iron core inductance energy, and specifically comprises the following steps:
The first stage: the winding voltage and the loop current change slowly, the iron core flux linkage changes rapidly, and the iron core magnetic field is gradually enhanced to saturation at the moment;
And a second stage: the winding voltage and the loop current change rapidly, the iron core flux linkage changes slowly, at the moment, the polarity of the electric field of the capacitor is reversed, and the redundant energy is fed back to the capacitor and stored;
And a third stage: as in the first stage, the core magnetic field changes greatly and the polarity of the core magnetic field is reversed;
Fourth stage: as with the second stage, the capacitor electric field is reversed in polarity.
2. The demagnetizing device for energy storage oscillating transformer according to claim 1, wherein an overvoltage protector is further provided between the energy storage module and the charging control module.
3. The demagnetizing device for energy storage oscillating transformer according to claim 1, characterized in that the energy storage module is an energy storage capacitor.
4. The energy storage oscillation type transformer demagnetizing device according to claim 1, wherein the power module comprises a sine generator, a signal follower, a driving signal isolator, a voltage and frequency regulating module and a booster, the output end of the sine generator is connected with the signal follower, the output end of the signal follower is connected with the driving signal isolator, the output end of the driving signal isolator is connected with the voltage and frequency regulating module, the output end of the voltage and frequency regulating module is connected with the booster, and the sine generator is connected with the control module.
5. The demagnetizing device for energy-storing oscillating transformer according to claim 1, wherein the lifting handle and the telescopic pull rod are arranged on the box body, and the moving wheel is arranged at the bottom of the box body.
6. The demagnetizing device for energy storage oscillating transformer according to claim 1, characterized in that the network side and valve side leads of the converter transformer are disconnected, and the demagnetizing device is connected with the network side winding of the converter transformer; the method specifically comprises the following steps:
Disconnecting the leads at the net side and the valve side of the converter transformer, keeping the net side winding and the valve side winding in an open state, connecting the net side winding of the tested converter transformer with a demagnetizing device by using a test wire, connecting a high-voltage wiring terminal of the converter transformer net side winding with a positive polarity wiring terminal of the demagnetizing device, and connecting the high-voltage wiring terminal of the converter transformer net side winding with a negative polarity wiring terminal of the demagnetizing device.
7. The demagnetizing device for energy storage oscillation type transformer according to claim 1, characterized in that the excitation voltage is selected for the voltage of the demagnetizing device; the method specifically comprises the following steps:
Calculating excitation voltage U 0 according to the no-load power P 0 and no-load current I 0 of the converter transformer of the object by using an equation shown in the formula (1);
8. The demagnetizing device for energy storage oscillating transformer according to claim 1, characterized in that the demagnetizing device charges the energy storage module through the adjustable boost module, and specifically comprises:
The demagnetizing device boosts through the adjustable boosting module, and outputs direct-current voltage to charge the energy storage module by controlling the triggering angle of the semi-control rectifying circuit to charge to the exciting voltage U 0.
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| CN202311771550.9A CN117497283B (en) | 2023-12-21 | 2023-12-21 | Energy storage oscillation type transformer demagnetizing device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2156574Y (en) * | 1993-05-28 | 1994-02-16 | 天津铁路分局古冶机务段 | Electric instrument integral magnetization and demagnetization machine |
| JP2011249612A (en) * | 2010-05-27 | 2011-12-08 | Magnet Force Co Ltd | Demagnetization method and demagnetization apparatus |
| CN106158236A (en) * | 2016-08-23 | 2016-11-23 | 苏州艾酷玛赫设备制造有限公司 | Portable demagnetizer |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4829397A (en) * | 1985-02-28 | 1989-05-09 | Odesskoe Spetsialnoe Konstruktorskoe Bjuro Spetsialnykh Stankov | Apparatus for demagnetizing parts |
| JP7217898B2 (en) * | 2021-04-12 | 2023-02-06 | 株式会社 菱小 | Demagnetization method |
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2023
- 2023-12-21 CN CN202311771550.9A patent/CN117497283B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2156574Y (en) * | 1993-05-28 | 1994-02-16 | 天津铁路分局古冶机务段 | Electric instrument integral magnetization and demagnetization machine |
| JP2011249612A (en) * | 2010-05-27 | 2011-12-08 | Magnet Force Co Ltd | Demagnetization method and demagnetization apparatus |
| CN106158236A (en) * | 2016-08-23 | 2016-11-23 | 苏州艾酷玛赫设备制造有限公司 | Portable demagnetizer |
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