WO2012160752A1 - 変圧器およびアーク放電加工装置 - Google Patents
変圧器およびアーク放電加工装置 Download PDFInfo
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- WO2012160752A1 WO2012160752A1 PCT/JP2012/002667 JP2012002667W WO2012160752A1 WO 2012160752 A1 WO2012160752 A1 WO 2012160752A1 JP 2012002667 W JP2012002667 W JP 2012002667W WO 2012160752 A1 WO2012160752 A1 WO 2012160752A1
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- core
- transformer
- tertiary winding
- wound around
- winding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/38—Auxiliary core members; Auxiliary coils or windings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/08—High-leakage transformers or inductances
- H01F38/10—Ballasts, e.g. for discharge lamps
Definitions
- the present invention mainly relates to a transformer including a circular core and an arc electric discharge machining apparatus including the transformer.
- FIG. 8 shows a schematic configuration of a core constituting a conventional transformer used in a welding machine.
- the circular core constituting the transformer has a structure in which several gap materials are inserted into the gap portion of the circular core, and the characteristics of the transformer are changed depending on the combination and thickness of the gap material. Is known (see, for example, Patent Document 1).
- the present invention provides a transformer that can be changed in characteristics and easy to produce without using a complicated structure or method, and an arc discharge machining apparatus using the transformer.
- a transformer according to the present invention includes a first core, a primary winding wound around the first core, a secondary winding wound around the first core, and the above A tertiary winding wound around the first core; and a second core, and the winding on the side of the tertiary winding not wound around the first core is wound around the second core.
- the above-described tertiary winding is configured as a closed loop.
- the arc electric discharge machining apparatus of the present invention transforms the output of the first rectification unit that rectifies AC power input from the outside, the inverter unit that converts the output of the first rectification unit into AC, and the output of the inverter unit.
- the transformer includes the above-described transformer and a second rectifying unit that rectifies the output of the transformer into a direct current.
- FIG. 1 is a plan view showing a schematic configuration of a transformer according to Embodiment 1 of the present invention.
- FIG. 2 is a schematic diagram showing a schematic circuit of the transformer in the first embodiment of the present invention.
- FIG. 3 shows the second core relative to the turn ratio of the number of turns of the tertiary winding wound around the second core with respect to the number of turns of the tertiary winding wound around the first core of the transformer according to Embodiment 3 of the present invention. It is a figure which shows the emitted-heat amount of.
- FIG. 4 is a circuit diagram showing a schematic configuration of an arc electric discharge machining apparatus according to Embodiment 6 of the present invention.
- FIG. 1 is a plan view showing a schematic configuration of a transformer according to Embodiment 1 of the present invention.
- FIG. 2 is a schematic diagram showing a schematic circuit of the transformer in the first embodiment of the present invention.
- FIG. 3 shows the second core relative to the turn ratio of the number of
- FIG. 5 is a waveform diagram showing temporal changes in the drive signal due to load fluctuations in the sixth embodiment of the present invention.
- FIG. 6 is a waveform diagram showing temporal changes in the current flowing through the primary winding when the tertiary winding is not provided in the sixth embodiment of the present invention and no gap material is inserted into the core.
- FIG. 7 is a waveform diagram showing temporal changes in the current flowing through the primary winding and the tertiary winding when the tertiary winding in Embodiment 6 of the present invention is added.
- FIG. 8 is a plan view showing a schematic configuration of a core constituting a conventional transformer used in a welding machine.
- FIG. 1 is a plan view showing a schematic configuration of the transformer in the first embodiment.
- FIG. 2 is a schematic diagram showing a schematic circuit of the transformer in the first embodiment.
- the transformer 1 includes a first core 2, a primary winding 3, first connection portions 4 a and 4 b, a secondary winding 5, and second connection portions 6 a and 6 b. , 6c, 6d, a tertiary winding 7, and a third connecting portion 8.
- the primary winding 3 is a winding wound around the first core 2.
- the first connection parts 4a and 4b are connection parts for connecting the end of the primary winding 3 to another circuit.
- the secondary winding 5 is a winding wound around the first core 2.
- the second connection portions 6a, 6b, 6c, and 6d are connection portions for connecting the end portion of the secondary winding 5 to another circuit.
- the tertiary winding 7 is a winding wound around the first core 2.
- the third connection portion 8 is a connection portion for connecting the end portions of the tertiary winding 7 to each other. Then, the winding 7a of the tertiary winding 7 that is not wound around the first core 2 is wound around the second core 9, and one end and the other end of the tertiary winding 7 are connected to the third connection. By connecting at the part 8, the tertiary winding 7 is closed loop.
- the transformer 1 configured as described above will be described.
- the primary winding 3 As the primary winding 3, the secondary winding 5, and the tertiary winding 7 shown in FIG. 1, copper, aluminum, or litz wire or vinyl that is a bundle of rectangular, round, or strip-like copper wires. Various materials such as electric wires can be used. These windings may be provided with an insulating coating, or an insulating sheet may be inserted between the primary winding 3 and the secondary winding 5.
- a primary winding 3 and a secondary winding 5 are wound around the first core 2. In particular, with respect to the primary winding 3 and the secondary winding 5, a constant tension is applied when winding the first core 2, so that the first core 2, the primary winding 3, and the secondary winding 5 are applied. The bond is strong.
- the third winding 7 is closed loop by connecting one end and the other end of the tertiary winding 7 with the third connecting portion 8.
- the secondary winding 5 is thicker than the primary winding 3, for example, and the tertiary winding 7 is thinner than the primary winding 3, for example. I use it.
- the primary winding 3 and the secondary winding 5 are wound substantially adjacent to the respective portions of the first core 2.
- a connection method in the 3rd connection part 8 for making the tertiary winding 7 into a closed loop there exist soldering, the connection by crimping, the fastening by a screw, etc.
- the core in order to change the characteristics of the transformer, the core is divided into at least two, and the surfaces facing each other when both cores are abutted have nonmagnetic electrically insulating properties. A gap is inserted.
- a method is adopted in which the magnetic resistance of the core is increased to make it difficult for the magnetic flux to flow.
- it is possible to further change the characteristics of the transformer by changing the material and thickness of the gap.
- the characteristics of the transformer can be changed by inserting the gap in the core.
- the transformer primary winding is the power input side and the secondary winding is the output side
- the magnetic resistance is increased by inserting a gap, thereby suppressing a rapid change in magnetic flux.
- the magnetic flux does not change abruptly, and the magnetic saturation phenomenon, which is a phenomenon that the function of the transformer core is lost, can be suppressed.
- the magnetic saturation phenomenon which is a phenomenon that the function of the transformer core is lost, can be suppressed.
- the current on the input side suddenly increases, and the electrical equipment connected to the input side may be destroyed. Therefore, it is very important not to generate a magnetic saturation phenomenon in the transformer.
- the tertiary winding 7 is wound around the first core 2, and the tertiary winding 7 on the side not wound around the first core is the second core 9. It is wound around. And in the 3rd connection part 8, the tertiary winding 7 is made into the closed loop by connecting one end and the other end of the tertiary winding 7. With such a configuration, the tertiary winding 7 wound around the second core 9 becomes a load of the magnetic flux of the first core 2 and makes it difficult for the magnetic flux to flow. As a result, as in the case of the transformer in the case where the gap 106 is inserted into the core 105 described in the background art section, it is possible to obtain effects such as changing the characteristics of the transformer and suppressing the magnetic saturation phenomenon.
- the number of turns of the tertiary winding 7 wound around the first core 2, the number of turns of the tertiary winding 7 wound around the second core 9, and the number of turns wound around the first core 2 By changing the turn ratio of the number of turns of the tertiary winding 7 wound around the second core 9 with respect to the number of turns of the tertiary winding 7 and the material of the second core 9, the load characteristic of the magnetic flux of the transformer 1 is changed. be able to. Therefore, in this Embodiment 1, the effect similar to the characteristic change in a transformer and suppression of a magnetic saturation phenomenon when changing the material and thickness of a gap can be acquired, without providing a gap.
- the transformer 1 of the first embodiment has a first core 2 and a second core 9, and has a configuration in which a tertiary winding 7 is wound around these two cores to form a closed loop.
- the effects of changing the characteristics of the vessel 1 and suppressing the magnetic saturation phenomenon can be obtained. Therefore, with this configuration, it is possible to realize a transformer 1 that can be changed in characteristics and easily manufactured without using a complicated structure or method.
- the first embodiment can cope with both the case where the first core 2 is not provided with a gap and the case where the gap is provided.
- the first core 2 of the transformer 1 may be provided with a bobbin for facilitating winding of the primary winding 3, the secondary winding 5 and the tertiary winding 7.
- a bobbin for facilitating winding of the primary winding 3, the secondary winding 5 and the tertiary winding 7.
- the first core 2 The number of turns of the tertiary winding 7 wound around 2 needs to be smaller than the number of turns of the tertiary winding 7 wound around the second core 9. The reason is that when the number of turns of the tertiary winding 7 wound around the second core 9 is smaller than the number of turns of the tertiary winding 7 wound around the first core 2, This is because it is difficult to be a magnetic flux load and it is difficult to change the characteristics of the transformer 1.
- the number of turns of the tertiary winding 7 wound around the first core 2 is set to be smaller than the number of turns of the tertiary winding 7 wound around the second core 9. Yes.
- the magnetic flux can be loaded by the tertiary winding 7 to change the characteristics of the transformer 1 and suppress the magnetic saturation phenomenon. Therefore, even when the gap is not inserted into the first core 2, the same effect as when the gap is inserted can be obtained, and the characteristics of the transformer 1 can be changed and the magnetic saturation phenomenon can be suppressed.
- FIG. 3 shows the turn ratio of the number of turns of the tertiary winding 7 wound around the second core 9 to the number of turns of the tertiary winding 7 wound around the first core 2 of the transformer 1 according to Embodiment 3 of the present invention. It is a figure which shows the emitted-heat amount of the 2nd core 9 with respect to.
- the horizontal axis of FIG. 3 shows the turns ratio of the number of turns of the tertiary winding 7 wound around the second core 9 to the number of turns of the tertiary winding 7 wound around the first core 2 of the transformer 1.
- the effect of suppressing the characteristic change of the transformer 1 and the magnetic saturation phenomenon is the ratio of the number of turns of the tertiary winding 7 wound around the second core 9 to the number of turns of the tertiary winding 7 wound around the first core 2.
- the Curie temperature which is the temperature at which the second core 9 functions as a core, is exceeded and does not function as a core. Cannot be obtained.
- the turn ratio is larger than 20, the current flowing through the tertiary winding 7 is lowered, and the magnetic flux flowing through the second core 9 is also lowered.
- the heat generation of the second core 9 can be suppressed, the effect of changing the characteristics of the transformer 1 and suppressing the magnetic saturation phenomenon are reduced, and the magnetic saturation phenomenon is likely to occur.
- the tertiary winding 7 is wound around the first core 2 of the transformer 1, and the winding that is not wound around the first core 2 of the tertiary winding 7 is wound around the second core 9.
- the transformer 1 that is turned to make the tertiary winding 7 a closed loop there is an optimum range of the turns ratio. That is, the ratio of the number of turns of the tertiary winding 7 wound around the second core 9 to the number of turns of the tertiary winding 7 wound around the first core 2 may be 15 or more and 20 or less.
- the gap is inserted for changing the characteristics of the transformer 1 and suppressing the magnetic saturation phenomenon by applying a load to the magnetic flux of the first core 2.
- the same effect as that obtained can be obtained.
- a magnetic flux load from the tertiary winding 7 is further applied to the first core 2.
- the effect can be obtained as an object.
- the fourth embodiment will be described with reference to FIG. 1 and FIG.
- the first core 2 of the transformer 1 is a circular toroidal core as shown in FIG.
- the method of cutting a part of the toroidal core and inserting and fixing the gap at the cut portion not only the strength is inferior depending on the fixing method, but also the effect of the gap changes depending on the cutting accuracy. Therefore, it was difficult to produce a transformer having the same characteristics, and the production method was complicated. Furthermore, when changing the characteristics of the completed transformer, it has been difficult to change such as rewinding the primary and secondary windings already wound and changing the material and thickness of the fixed gap.
- the core used for the transformer 1 is circular like a toroidal core, a part of the toroidal core is not cut. Further, even after the primary winding 3 and the secondary winding 5 are wound around the first core 2, a tertiary winding 7 is added in order to change the characteristics of the transformer 1 and suppress the magnetic saturation phenomenon. It can also be removed.
- the fifth embodiment will be described with reference to FIG. 1 and FIG.
- the material of the first core 2 of the transformer 1 shown in FIG. 1 is an amorphous metal
- the magnetic permeability is superior to that of ferrite, so that the conversion efficiency for converting the current into the strength of the magnetic field is excellent.
- the heat generation of the first core 2 can be suppressed, and the Curie temperature (the temperature at which the core does not function) is high. Characteristics can be maintained. Thereby, it is suppressed that other parts etc. of the electric equipment carrying the transformer 1 are damaged, and the reliability becomes high.
- the material of the second core 9 of the transformer 1 shown in FIG. 1 is a dust core, it is very effective in suppressing the magnetic saturation phenomenon.
- the ferrite core is used, the effect of suppressing the magnetic saturation phenomenon is reduced as compared with the dust core.
- the transformer 1 according to the fifth embodiment has a configuration in which the first core 2 is an amorphous core made of an amorphous metal and the second core 9 is a dust core.
- the first core 2 is an amorphous core made of an amorphous metal
- the second core 9 is a dust core.
- FIG. 4 is a circuit diagram showing a schematic configuration of an arc electric discharge machining apparatus 10 such as an arc welder or an arc cutter in Embodiment 6 of the present invention.
- FIG. 5 is a waveform diagram showing temporal changes in the drive signal due to fluctuations in an arc load 24 described later in Embodiment 6 of the present invention.
- FIG. 6 shows the temporal flow of the current flowing through the primary winding 3 of the transformer 1 when the tertiary winding 7 is not provided and no gap material is inserted into the first core 2 in Embodiment 6 of the present invention. It is a wave form diagram which shows a change.
- FIG. 7 differs from FIG. 6 in that the current flowing in the primary winding 3 and the tertiary winding 7 when the tertiary winding 7 is provided as shown in FIG. It is a waveform which shows the time change of an electric current.
- the arc electric discharge machining apparatus 10 includes a first rectification unit 11 that rectifies a three-phase or single-phase AC input power supply. Moreover, the 1st switching part 12 and the 2nd switching part 13 are connected in series, and comprise a 1st switching circuit. In addition, the third switching unit 14 and the fourth switching unit 15 are connected in series to constitute a second switching circuit. The first switching circuit and the second switching circuit are connected between the outputs of the first rectifying unit 11, and the primary current flows in the first direction via the first switching unit 12 and the fourth switching unit 15. Flows.
- the primary current flows in the second direction opposite to the first direction via the second switching unit 13 and the third switching unit 14.
- the first connection parts 4a and 4b of the transformer 1 are connected to the first switching circuit and the second switching circuit, respectively, so that such a primary current flows.
- the first switching circuit and the second switching circuit constitute an inverter unit that converts the output rectified by the first rectifying unit 11 into alternating current.
- the second connecting portions 6a and 6d of the secondary winding 5 of the transformer 1 shown in FIGS. 1 and 2 are connected to the second rectifying portion 16 shown in FIG. 4, and the second connecting portions 16a and 6d shown in FIGS. Are connected to the output terminal 17 shown in FIG. 4, and the current rectified by the second rectification unit 16 is output to the outside of the arc discharge machining apparatus 10 via the output terminal 17.
- the arc discharge machining apparatus 10 includes the first rectification unit 11 that rectifies AC power input from the outside, the inverter unit that converts the output of the first rectification unit 11 to AC, It comprises a transformer 1 that transforms the output of the inverter unit, and a second rectifying unit 16 that rectifies the output of the transformer 1 into a direct current.
- the arc electric discharge machining apparatus 10 includes an output detection unit 18, an output setting unit 19, and a control unit 20.
- the output detection unit 18 detects the voltage across the output terminal 17 and the output current output from the output terminal 17.
- the output setting unit 19 arbitrarily sets the output voltage and the output current.
- the control unit 20 compares the output of the output detection unit 18 with the output of the output setting unit 19, and the first switching unit 12, the second switching unit 13, the third switching unit 14, and the fourth switching unit 15. A drive signal is output respectively.
- one of the output terminals 17 is connected to the welding torch 21, and the other of the output terminals 17 is connected to the welding object 23.
- the welding torch 21 supplies the electric power output from the output terminal 17 to the welding wire 22.
- the welding wire 22 is fed to the welding object 23 by a feeding motor (not shown) and welding is performed.
- the first connection portion 4 a which is the end portion of the primary winding 3 is connected to the first switching portion 12 and the second switching portion 13, and the first connection portion 4 b. Are connected to the third switching unit 14 and the fourth switching unit 15.
- the second connection portions 6 a and 6 d which are the end portions of the secondary winding 5 are connected to the second rectification unit 16, and the second connection portions 6 b and 6 c are connected to the output terminal 17.
- the tertiary winding 7 is wound around the first core 2 and the second core 9, and then the ends of the tertiary winding 7 are connected by the third connection portion 8 to form a closed loop.
- the first switching unit 12 to the fourth switching unit 15 include, for example, an IGBT (Insulated Gate Bipolar Transistor), a MOSFET (Metal-Oxide Semiconductor Field Effect Transistor), or the like. Further, the second rectifying unit 16 is configured by a diode or the like, for example.
- IGBT Insulated Gate Bipolar Transistor
- MOSFET Metal-Oxide Semiconductor Field Effect Transistor
- the second rectifying unit 16 is configured by a diode or the like, for example.
- the output setting unit 19 including a volume or a jog dial or a switch (not shown) shown in FIG. 4 is for setting an output voltage and an output current.
- the output voltage and output current are detected by the output detection unit 18, and the output setting value set by the output setting unit 19 and the output detection unit 18 are detected by the control unit 20 configured by an electronic circuit such as a CPU or an operational amplifier.
- the control unit 20 outputs a drive signal from the first switching unit 12 to the fourth switching unit 15 so that the detected values match.
- the drive signal output by the control unit 20 is, for example, a signal for causing a PWM (Pulse Width Modulation) operation or a phase shift operation.
- PWM Pulse Width Modulation
- the primary current flows through the transformer 1, and the electric power converted by the first core 2 is converted into the second rectification. Is output to the unit 16.
- the electric power output to the second rectification unit 16 is rectified by the second rectification unit 16 and supplied to the welding wire 22 and the welding object 23 via the output terminal 17, and the welding wire 22 and the welding object 23 are connected to each other. An arc is generated between them and welding is performed.
- the welding torch 21 is for feeding the welding wire 22 fed by a feeding motor (not shown) to the intended place with respect to the welding object 23, and the output electric power is sent to the welding wire 22. To supply.
- the welding wire 22 which is a welding electrode is used as a consumable electrode.
- the welding electrode is referred to as a non-consumable electrode.
- a consumable electrode type arc discharge machining apparatus 10 more specifically, a consumable electrode type welding machine will be described as an example.
- the arc load 24 varies greatly between the short circuit and the arc.
- the load amount shown in FIG. 5 represents the magnitude of the arc load 24 shown in FIG. 4.
- the vertical axis indicates the load amount, and the larger the load amount, the higher the direction of the arrow.
- the drive signal A indicates a drive signal to the first switching unit 12 and the fourth switching unit 15.
- a drive signal B indicates a drive signal to the second switching unit 13 and the third switching unit 14.
- ON is indicated by a high level and OFF is indicated by a low level.
- the operations of the first switching unit 12 to the fourth switching unit 15 are operated as PWM operations.
- the control unit 20 shown in FIG. 4 uses the first switching unit based on the output detected by the output detection unit 18 so that the predetermined output voltage or output current set by the output setting unit 19 shown in FIG. A case where the drive width from 12 to the fourth switching unit 15 is controlled will be described.
- the width of the drive signal from the first switching unit 12 to the fourth switching unit 15 is narrowed.
- the width of the drive signal from the first switching unit 12 to the fourth switching unit 15 is widened. Note that, in a state where the fluctuation range of the arc load 24 is large (section E3), the driving signal may also fluctuate from a wide state to a narrow state and further to a wider state.
- the AC power input to the transformer 1 varies depending on the application, and is in a wide frequency band, such as from commercial or household power of 50 Hz or 60 Hz to over several MHz of communication equipment.
- the core may abnormally generate heat due to heat generated by iron loss such as eddy current loss or magnetic hysteresis loss.
- iron loss such as eddy current loss or magnetic hysteresis loss.
- the time for one cycle in the low frequency becomes longer, and therefore the time for the input current to flow in one direction becomes longer, resulting in a magnetic saturation phenomenon. Will occur.
- the primary current becomes abnormally high, and the circuit from the first switching unit 12 to the fourth switching unit 15 may be destroyed.
- the transformer 1 can realize stable operation by selecting a core material having characteristics suitable for each frequency and suppressing the flow of magnetic flux by inserting a gap into the core.
- the frequency (hereinafter referred to as “carrier frequency”) of the AC power of the arc electric discharge machining apparatus 10 of the sixth embodiment is generally several kHz to several hundred kHz.
- the primary current indicates a current flowing through the primary winding 3 of the transformer 1 in the circuit of the arc electric discharge machine 10 shown in FIG. 4.
- an amorphous metal operates stably at a carrier frequency of 50 kHz.
- the first switching unit 12 to the fourth switching unit 15 can use the carrier frequency only up to a certain level range depending on the switching speed, on-resistance, and the like.
- Switching loss can be reduced by using the soft switching control method as the driving method by the control unit 20, but it is difficult to significantly improve the carrier frequency. In particular, it is more difficult to increase the carrier frequency as the switching unit becomes cheaper.
- an expensive switching unit such as a MOSFET.
- IGBTs that are relatively inexpensive and easily available, switching loss can be reduced by using an inverter drive system, and high frequency can be supported. However, in general, the IGBT can be most efficiently used at a carrier frequency of 20 KHz to 30 kHz.
- the most suitable frequency band of the first core 2 of the transformer 1 is driven at a carrier frequency lower than the optimum carrier frequency in order to use an inexpensive switching unit. That is, for example, when driven at 20 kHz, which is a carrier frequency lower than 50 kHz, the magnetic saturation phenomenon is unlikely to occur if the ON width of the drive signal is stable at a constant width.
- the tertiary winding 7 as in the sixth embodiment is not provided in a state where the variation in the load amount is large, and a gap is inserted into the first core 2. If not, a magnetic saturation phenomenon may occur as shown in the primary current of the section E3.
- a non-magnetic electrically insulating gap is inserted into the surfaces facing each other when both divided cores are brought into contact with each other.
- the magnetic resistance is increased and the magnetic flux does not easily flow. Thereby, a magnetic saturation phenomenon can be suppressed.
- the tertiary winding 7 is wound around the first core 2 of the transformer 1, and the winding on the side of the tertiary winding 7 that is not wound around the first core 2. Is wound around the second core 9 and the ends of the tertiary winding 7 are connected to each other to make the tertiary winding 7 a closed loop. In this case, the closed loop tertiary winding 7 wound around the second core 9 serves as a magnetic flux load.
- the tertiary winding current indicates a current flowing through the tertiary winding 7 of the transformer 1 in the circuit of the arc discharge machining apparatus 10 shown in FIG. 4.
- the tertiary winding current in FIG. 7 has a waveform showing temporal changes when the tertiary winding 7 of the sixth embodiment is added.
- the first switching unit 12 to the fourth switching unit 15 may include an inverse diode in parallel with the IGBT, for example.
- a gap may also be provided in the second core. Then, a gap may be provided in either the first core or the second core, or a gap may be provided in both the first core and the second core.
- the number of turns wound around the first core and the second core of the tertiary winding can be changed without changing the material and thickness of the gap of the first core.
- the characteristics of the vessel can be changed.
- the transformer of the present invention can change the characteristics of the transformer by adding a tertiary winding even when no gap is inserted in the core. It is useful above.
Abstract
Description
本発明の実施の形態1について、図1と図2を用いて説明する。図1は、実施の形態1における変圧器の概略構成を示す平面図である。図2は、実施の形態1における変圧器の概略回路を示す模式図である。
本実施の形態2について、図1と図2を用いて説明する。実施の形態1において、第一のコア2に巻回した三次巻線7の巻数、第二のコア9に巻回した三次巻線7の巻数、第一のコア2に巻回した三次巻線7の巻数に対する第二のコア9に巻回した三次巻線7の巻数の巻数比および第二のコア9の材質を変更することで、変圧器1の磁束の負荷特性を変更することができることを述べた。
本実施の形態3について、図1から図3を用いて説明する。図3は、本発明の実施の形態3における変圧器1の第一のコア2に巻回する三次巻線7の巻数に対する第二のコア9に巻回する三次巻線7の巻数の巻数比に対する、第二のコア9の発熱量を示す図である。図3の横軸は、変圧器1の第一のコア2に巻回する三次巻線7の巻数に対する第二のコア9に巻回する三次巻線7の巻数の巻数比を示している。図3の縦軸は、変圧器1の第一の接続部4a、4bから所定の交流電力を入力し、変換された交流電力を第二の接続部6a、6b、6c、6dから出力した場合の、第二のコア9の表面の発熱量を示している。
本実施の形態4について、図1と図2を用いて説明する。図1に示すように、変圧器1の第一のコア2が円形のトロイダルコアである場合を考える。この場合に、トロイダルコアにギャップを挿入するためには、トロイダルコアの一部を切断し、その切断面の両方で挟み込むようにギャップを挿入し、さらに固定する必要がある。このように、トロイダルコアの一部を切断し、切断部分にギャップを挿入して固定する方法では、固定方法によっては強度が劣るだけでなく、切断精度によってはギャップの効果が変わってしまう。そのため、同じ特性をもつ変圧器を生産することは困難であり、生産方法も複雑であった。さらに完成した変圧器の特性を変更する場合、すでに巻回していた一次巻線および二次巻線を巻戻し、固定されているギャップの材質や厚みを変更するなど、変更が困難であった。
本実施の形態5について、図1と図2を用いて説明する。図1に示す変圧器1の第一のコア2の材質がアモルファスの金属である場合、透磁率がフェライトよりも優れているため、電流を磁界の強さに変換する変換効率が優れている。それだけでなく、鉄損が低いため、第一のコア2の発熱を抑制することができるとともに、キュリー温度(コアとして機能しなくなる温度)が高いため、高温状態における使用環境でも変圧器1としての特性を維持することができる。これにより、変圧器1を搭載した電気機器の他の部品等を破損することが抑制され、信頼性が高いものとなる。
本実施の形態6について、図1、図2および図4から図7を用いて説明する。
2 第一のコア
3 一次巻線
4a,4b 第一の接続部
5 二次巻線
6a,6b,6c,6d 第二の接続部
7 三次巻線
7a 巻線
8 第三の接続部
9 第二のコア
10 アーク放電加工装置
11 第一の整流部
12 第一のスイッチング部
13 第二のスイッチング部
14 第三のスイッチング部
15 第四のスイッチング部
16 第二の整流部
17 出力端子
18 出力検出部
19 出力設定部
20 制御部
21 溶接トーチ
22 溶接ワイヤ
23 溶接対象物
24 アーク負荷
Claims (7)
- 第1のコアと、
前記第1のコアに巻回した一次巻線と、
前記第1のコアに巻回した二次巻線と、
前記第1のコアに巻回した三次巻線と、
第2のコアと、を備え、
前記三次巻線の前記第1のコアに巻回していない側の巻線は、前記第2のコアに巻回して、前記三次巻線を閉ループとした変圧器。 - 前記第1のコアに巻回する前記三次巻線の巻数は、前記第2のコアに巻回する前記三次巻線の巻数よりも少ない請求項1記載の変圧器。
- 前記第1のコアに巻回する前記三次巻線の巻数に対する前記第2のコアに巻回する前記三次巻線の巻数の巻数比は、15以上、20以下である請求項2に記載の変圧器。
- 前記第1のコアはアモルファスコアであり、前記第2のコアはダストコアである請求項1に記載の変圧器。
- 前記第1のコアと前記第2のコアは、ギャップを有さないトロイダルコアである請求項1に記載の変圧器。
- 前記第1のコアおよび前記第2のコアのうちの少なくともいずれかにギャップを設けた請求項1に記載の変圧器。
- 外部から入力した交流電力を整流する第1の整流部と、
前記第1の整流部の出力を交流に変換するインバータ部と、
前記インバータ部の出力を変圧する請求項1から6のいずれか1項に記載の変圧器と、
前記変圧器の出力を直流に整流する第2の整流部と、
を備えたアーク放電加工装置。
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS57115974A (en) * | 1981-01-06 | 1982-07-19 | Sansha Electric Mfg Co Ltd | Welding machine |
JPS6316418U (ja) * | 1986-07-18 | 1988-02-03 | ||
JP2007067293A (ja) * | 2005-09-01 | 2007-03-15 | Tokyo Institute Of Technology | 伝導性電磁雑音抑制装置 |
JP2007128985A (ja) * | 2005-11-01 | 2007-05-24 | Taiyo Yuden Co Ltd | 可変インダクタ及びそれを用いたアンテナ装置 |
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FR2757996B1 (fr) * | 1996-12-26 | 1999-07-16 | Thomson Television Components | Transformateur haute tension a enroulements en vrac ranges |
JPH11356044A (ja) * | 1998-04-10 | 1999-12-24 | Sony Corp | 共振型スイッチング電源 |
JP2002075747A (ja) * | 2000-09-04 | 2002-03-15 | Mitsubishi Electric Corp | ギャップ付磁芯およびその製造方法 |
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2012
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Publication number | Priority date | Publication date | Assignee | Title |
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JPS57115974A (en) * | 1981-01-06 | 1982-07-19 | Sansha Electric Mfg Co Ltd | Welding machine |
JPS6316418U (ja) * | 1986-07-18 | 1988-02-03 | ||
JP2007067293A (ja) * | 2005-09-01 | 2007-03-15 | Tokyo Institute Of Technology | 伝導性電磁雑音抑制装置 |
JP2007128985A (ja) * | 2005-11-01 | 2007-05-24 | Taiyo Yuden Co Ltd | 可変インダクタ及びそれを用いたアンテナ装置 |
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CN103053001B (zh) | 2015-09-16 |
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