Magnetic capacitance element and method of use

Abstract

The application relates to a magnetic capacity element, and relates to the design of the magnetic capacity element from the definition, calculation formula and port characteristics of the element. The strength of the magnetic hysteresis phenomenon in the vector magnetic circuit can be predicted and controlled from the magnetic circuit angle by adding or reducing the magnetic capacity element in the magnetic circuit, the effect caused by the magnetic hysteresis phenomenon is controlled, the magnetic flux vector state in the magnetic circuit is consistent with the target magnetic flux vector state, and an application method is provided based on the same. The target magnetic circuit is composed of the magnetic capacity element, the magnetic resistance element and the magnetic inductance element in series, three physical phenomena of the magnetic resistance, the eddy current and the magnetic hysteresis in the magnetic circuit are quantitatively characterized by the magnetic circuit parameters corresponding to the three magnetic circuit elements, and the operating characteristics of the magnetic circuit can be changed in a targeted manner and the vector magnetic quantity and the magnetic circuit power in the magnetic circuit can be changed in a purposeful manner according to the change of different magnetic circuit parameters.

Description

Technical Field

[0001] This invention relates to a magnetic capacitor element and its application method, belonging to the field of magnetic circuit design technology. Background Technology

[0002] Hysteresis and loss characteristics are important inherent features of magnetic materials. Currently, the hysteresis characteristics of different magnetic materials are mainly characterized by hysteresis loops. Most electrical equipment contains components made of magnetic materials, such as generators and power transformer cores in power systems, and inductors in electronic circuits. Therefore, the study of the hysteresis and loss characteristics of ferromagnetic materials has important engineering significance.

[0003] Without considering eddy currents, from a macroscopic perspective, there is always a phase difference between the magnetic induction intensity B and the magnetic field intensity H during the repeated magnetization of a magnetic material; this is known as hysteresis. To improve the accuracy of magnetic circuits constructed from magnetic materials and to simulate various steady-state and transient conditions in actual magnetic circuits (DC bias, voltage drop, remanence calculation, and ferromagnetic resonance), existing technologies have proposed several iron-core hysteresis models that consider hysteresis phenomena. For the magnetization phenomenon of ferromagnetic materials, hysteresis models can be divided into four types: ① Hysteresis modeling methods derived from micromagnetism theory. This method has clear physical meaning but is computationally complex and not suitable for macroscopic applications; ② Macroscopic magnetization theory, based on phenomenological principles, belongs to pure mathematical modeling. A classic example is the Preisaeh model proposed by the German physicist F. Preisach. However, the macroscopic Preisach model does not consider the physical basis of magnetization or the source of hysteresis; ③ Mesoscopic hysteresis theory, with the classic example being the JA hysteresis model jointly proposed by physicists DC. Jiles and D. Latherton. This model combines the microstructure of ferromagnetic materials with macroscopic characterization to represent the properties of ferromagnetic materials. However, identifying the parameters of the JA hysteresis model requires solving with a large amount of experimental data. Neural network hysteresis models offer high flexibility and accuracy in simulating hysteresis behavior, but require a large amount of data and computational resources, and it is difficult to elucidate the generation mechanism of hysteresis phenomena.

[0004] In summary, current research on magnetic materials still focuses on achieving accurate and efficient simulation and analysis of hysteresis phenomena and loss characteristics in magnetic materials. However, how to predict and control the strength of hysteresis phenomena in magnetic materials from the perspective of magnetic circuits, as well as the effects of hysteresis phenomena, such as hysteresis loss and remanence, have not yet been fully studied and resolved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a magnetic capacitive element, which is designed based on various properties and applied to a magnetic circuit to change the strength of the hysteresis phenomenon in the magnetic circuit and control the magnitude of the effect brought about by the hysteresis phenomenon.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention designs a magnetocapacitive element. Based on the length h, cross-sectional area A, permeability μ, hysteresis angle γ, and magnetic source angular frequency ω of the magnetic circuit where the magnetocapacitive element is located, the magnetocapacitive value of the magnetocapacitive element is determined. The unit of magnetic capacitance is Ω·s 2 The physical meaning of the magnetocapacitance value C represents the magnetic flux Φ flowing through the magnetocapacitive element. C The integral over time t and the magnetomotive force across the magnetic capacitor element The ratio, i.e. The unit of magnetocapacitance is Wb·s / A; where κ represents the permittivity. - Represents the magnetomotive force at both ends of the magnetic capacitor element With the magnetic flux Φ flowing through the magnetocapacitive element C The reference direction is opposite to the preset reference direction.

[0007] Based on a magnetocapacitive element structure consisting of at least two sub-magnetic capacitive elements, when n sub-magnetic capacitive elements are connected in series, the overall magnetocapacitance value of the series structure is... When n sub-magnetic capacitor elements are connected in parallel, the overall capacitance value of the parallel structure is C = C1 + C2 + ... + C n-1 +C n .

[0008] As a preferred embodiment of the present invention: if the environmental variables of the magnetic circuit in which the magnetic capacitor element is located change with time, then the magnetic capacitance value of the magnetic capacitor element changes with time, and the magnetomotive force of the magnetic capacitor element about its two ends... With the magnetic flux Φ flowing through it C The port characteristics of the relationship between them are

[0009] If the environmental variables of the magnetic circuit in which the magnetocapacitive element is located do not change with time, then the magnetocapacitance of the magnetocapacitive element does not change with time, and the magnetomotive force of the magnetocapacitive element about its two ends... With the magnetic flux Φ flowing through it C The port characteristics of the relationship between them are or

[0010] As a preferred technical solution of the present invention: based on the fact that the environmental variables of the magnetic circuit in which the magnetocapacitive element is located do not change with time, and the magnetocapacitance value of the magnetocapacitive element does not change with time, when the magnetic circuit in which the magnetocapacitive element is located is excited by a stable sinusoidal magnetomotive force, the magnetomotive force of the magnetocapacitive element about its two ends is obtained according to the phasor method. phasor With the magnetic flux Φ flowing through it C phasor The port characteristics of the relationship between them are Represents the phasor of the magnetomotive force at both ends of the magnetocaloric element The phase of the magnetic flux phasor leading the magnetic capacitor element The phase of , where j represents the imaginary unit.

[0011] As a preferred embodiment of the present invention: the magnetocapacitive element has an impeding effect on the alternating magnetic flux in its magnetic circuit, and no impeding effect on the constant magnetic flux in its magnetic circuit, then the magnetocapacitive reactance corresponding to the magnetocapacitive element is... Magnetocalor Magnetocalor is used to describe the magnitude of resistance of a magnetocaloric element to alternating magnetic flux in its magnetic circuit. The unit is A / Wb; when the magnetic circuit of the magnetocapacitive element is excited by a stable sinusoidal magnetomotive force, the magnetocapacitance value of the magnetocapacitive element is used as the reference value. The capacitance value C decreases as the magnetic source angular frequency ω increases; according to the magnetocapacitive reactance... Magnetocalor The magnetocapacitive reactance is independent of the magnetic source angular frequency ω corresponding to the magnetic circuit. It is determined by the length h, cross-sectional area A, permeability μ, and hysteresis angle γ of the magnetic capacitor element.

[0012] Corresponding to the above, the technical problem that this invention also needs to solve is to provide a method for applying a magnetocapacitive element, which connects a magnetoresistive element and a magnetic induction element in series, and changes the strength of the hysteresis phenomenon in the magnetic circuit by using the various properties of the magnetocapacitive element, thereby controlling the magnitude of the effect brought about by the hysteresis phenomenon. This not only enables the control of the magnitude of the magnetic flux, but also enables the control of the phase between the magnetic flux and the magnetomotive force, thereby improving the application efficiency of the magnetic circuit.

[0013] To solve the aforementioned technical problems, this invention adopts the following technical solution: This invention designs an application method for a magnetocapacitive element, comprising a target magnetic circuit formed by connecting a magnetocapacitive element, a magnetoresistive element, a magnetic induction element, and a magnetic source in series, wherein the target magnetic circuit satisfies Kirchhoff's magnetomotive force law of vector magnetic circuit theory, i.e. in, These represent the magnetomotive forces across the ends of the reluctance element, the magnetic induction element, and the magnetocaloric element, respectively. This indicates the magnetoresistive value of a magnetoresistive element. This indicates the magnetic flux density of the magnetic sensing element. This represents the magnetomotive force of the target magnetic circuit. This represents the magnetic flux flowing through the magnetoresistive element. This represents the magnetic flux flowing through the magnetic induction element, and

[0014] As a preferred technical solution of the present invention: when the target magnetic circuit is excited by a stable sinusoidal magnetomotive force, Kirchhoff's magnetomotive force law of vector magnetic circuit theory is obtained according to the phasor method, that is... in, The magnetomotive force phasor of the target magnetic circuit. This represents the phasor of magnetic flux flowing through the magnetoresistive element. It represents the magnetic flux phasor flowing through the magnetic induction element.

[0015] As a preferred embodiment of the present invention, the target magnetic circuit satisfies Kirchhoff's flux law of vector magnetic circuit theory and magnetic circuit theorem of vector magnetic circuit theory.

[0016] As a preferred embodiment of the present invention: the magnetic impedance in the target magnetic circuit and Among them, magnetic impedance Including magnetoresistance With magnetic resistance magnetic reactance Including magnetic resistance With magnetocapacitive reactance Indicates the magnetic impedance angle of the target magnetic circuit.

[0017] As a preferred embodiment of the present invention: for the target magnetic circuit, the following steps are performed to achieve the target magnetic circuit with respect to a preset target magnetic flux phasor. and preset target magnetic impedance angle Adjustments;

[0018] Step A. Based on the magnetic source angular frequency ω of the target magnetic circuit, and The target magnetic circuit satisfies Kirchhoff's magnetomotive force law. Calculate the magnetic reluctance in the target magnetic circuit and according to Calculate the magnetic reactance in the target magnetic circuit And based on the magnetic induction in the target magnetic circuit The neglect of magnetocapacitive reactance in the target magnetic circuit is obtained. Then proceed to step B;

[0019] Step B. Based on magnetocapacitive reactance And the magnetic source angular frequency ω of the target magnetic circuit, and the magnetocapacitance C in the target magnetic circuit is calculated. eq Then proceed to step C;

[0020] Step C. According to the formula Calculate the target magnetic capacitance value C2 corresponding to the target magnetic circuit, and then calculate based on the magnetic capacitance value C in the target magnetic circuit. eq According to C1=1 / (1 / C2-1 / C eq), obtain the incremental magnetocapacitance value C1 corresponding to the target magnetic circuit, and then proceed to step D;

[0021] Step D. Add a magnetocapacitive element that satisfies the incremental magnetocapacitance value C1 to the target magnetic circuit, so that the target magnetic circuit satisfies the preset target magnetic flux phasor. and preset target magnetic impedance angle

[0022] As a preferred technical solution of the present invention: In step D, according to the incremental magnetic capacitance value C1 corresponding to the target magnetic circuit, according to the magnetic capacitance value... Select appropriate magnetocaloric elements with suitable length h, cross-sectional area A, permeability μ, and hysteresis angle γ, and add them to the target magnetic circuit so that the target magnetic circuit satisfies the preset target magnetic flux phasor. and preset target magnetic impedance angle

[0023] Alternatively, based on the incremental magnetic capacitance value C1 corresponding to the target magnetic circuit, according to... and the magnetomotive force of the added magnetocapacitive element with respect to its two ends With the magnetic flux flowing through it Based on the port characteristics of the relationship between them, select the appropriate magnetocapacitive element and add it to the target magnetic circuit so that the target magnetic circuit meets the preset target magnetic flux phasor. and preset target magnetic impedance angle

[0024] As a preferred embodiment of the present invention: the reactive power of the target magnetic circuit Active power of target magnetic circuit apparent power of target magnetic circuit in, This represents the active power loss generated on the magnetic induction element in the target magnetic circuit, corresponding to the eddy current loss of the target magnetic circuit; This represents the active power loss generated on the magnetocapacitive element in the target magnetic circuit, corresponding to the hysteresis loss of the target magnetic circuit;

[0025] When the target magnetic circuit is excited by a stable sinusoidal magnetomotive force, the reactive power of the target magnetic circuit is... Active power of target magnetic circuit Active power on magnetic induction element Active power on magnetocapacitive elements

[0026] The magnetic capacitive element and its application method described in this invention, compared with the prior art, have the following technical advantages:

[0027] (1) The present invention designs a magnetic capacitor element and application method, which proposes the definition, calculation formula and port characteristics of the magnetic capacitor element. By adding or reducing the magnetic capacitor element, the strength of the hysteresis phenomenon in the vector magnetic circuit and the effects brought about by the hysteresis phenomenon, such as hysteresis loss and remanence effect, can be predicted and controlled from the perspective of magnetic circuit.

[0028] (2) The magnetic capacitive element and application method designed in this invention, in the target magnetic circuit composed of a magnetoresistive element, a magnetic induction element and a magnetic capacitive element, the magnetoresistive element represents the constant resistance to magnetic flux, the magnetic induction element represents the resistance to alternating magnetic flux by the eddy current effect, and the magnetic capacitive element represents the resistance to alternating magnetic flux by the hysteresis effect. The magnetic circuit parameters corresponding to the three magnetic circuit elements quantitatively characterize the three physical phenomena of magnetoresistive, eddy current and hysteresis in the magnetic circuit, so that technicians can change the operating characteristics of the magnetic circuit in a targeted manner and change the vector magnetic quantity in the magnetic circuit in a purposeful manner by changing different magnetic circuit parameters.

[0029] (3) The present invention designs a magnetocapacitive element and application method, and proposes expressions for the active power and reactive power of the target magnetic circuit. In the target magnetic circuit composed of magnetoresistive element, magnetic induction element and magnetocapacitive element, magnetoresistive element corresponds to reactive power, magnetic induction element corresponds to eddy current loss and magnetocapacitive element corresponds to hysteresis loss. Technicians can adjust the active power and reactive power of the magnetic circuit in a purposeful manner according to the power expressions of the three magnetic circuit elements so that the magnetic circuit capacity meets the actual application requirements. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the magnetocapacitive element and the target magnetic circuit of the present invention;

[0031] Figure 2 This is a schematic diagram of multiple magnetocapacitive elements connected in series according to the present invention;

[0032] Figure 3 This is a schematic diagram of multiple magnetocapacitive elements connected in parallel according to the present invention;

[0033] Figure 4 This is a flowchart illustrating how the magnetic capacitor element of the present invention changes the operating state of the magnetic circuit;

[0034] Figure 5 This is a simulation model diagram of the ferrite magnetic circuit of the present invention;

[0035] Figure 6 The waveforms of the initial magnetomotive force and initial magnetic flux of the magnetic circuit of the present invention are shown.

[0036] Figure 7 The equivalent magnetic circuit diagram of the transformer after adding a magnetocapacitive element according to the present invention;

[0037] Figure 8The waveform diagram of the magnetomotive force and magnetic flux of the magnetic circuit after the addition of the magnetocaloric element in this invention;

[0038] Figure 9 This is a comparison diagram of the magnetic circuit hysteresis loop before and after the addition of the magnetocaloric element in this invention. Detailed Implementation

[0039] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] This invention designs a magnetocapacitive element, which is a magnetic medium connected in series in a magnetic circuit. The core concept is to intentionally change the strength of hysteresis in the magnetic circuit by adding or removing magnetocapacitive elements, thereby altering the operating state of the vector magnetic quantity. For example, when the magnetomotive force in the magnetic circuit is stable, adding magnetocapacitive elements controls the strength of hysteresis, thus changing the magnitude of the magnetic flux and the phase angle between the magnetomotive force and the magnetic flux, making the magnetic flux vector state in the magnetic circuit consistent with the target magnetic flux vector state.

[0041] Magnetocaloric elements are physically represented as magnetic media exhibiting hysteresis, and their symbol is C. Here, the Lucida Calligraphy font is used to distinguish them from circuit elements in the circuit.

[0042] Specifically, the magnetocapacitive element designed here, based on its length h, cross-sectional area A, permeability μ, hysteresis angle γ, and the magnetic source angular frequency ω of the magnetic circuit in which the magnetocapacitive element is located, is as follows: Figure 1 As shown, the magnetocapacitive value of the magnetocapacitive element The unit of magnetic capacitance can be expressed as Ω·s. 2 The physical meaning of the magnetocapacitance value C represents the magnetic flux Φ flowing through the magnetocapacitive element. C The integral over time t (to calculate the effects of demagnetization and magnetization) and the magnetomotive force across the magnetocapacitive element The ratio, i.e. The unit of magnetocapacitance is Wb·s / A; where κ represents the permittivity. - Represents the magnetomotive force at both ends of the magnetic capacitor element With the magnetic flux Φ flowing through the magnetocapacitive element C The reference direction is opposite to the preset reference direction.

[0043] Based on a magnetocapacitive element structure consisting of at least two sub-magnetic capacitive elements, when n sub-magnetic capacitive elements are connected in series, the overall magnetocapacitance value of the series structure is... When n sub-magnetic capacitor elements are connected in parallel, the overall capacitance value of the parallel structure is C = C1 + C2 + ... + C n-1 +C n .

[0044] Further design of the magnetocapacitive element reveals that if the environmental variables of the magnetic circuit in which the magnetocapacitive element is located change with time, then the magnetocapacitance value of the magnetocapacitive element changes with time, and the magnetomotive force of the magnetocapacitive element about its terminals... With the magnetic flux Φ flowing through it C The port characteristics of the relationship between them are

[0045] If the environmental variables of the magnetic circuit in which the magnetocapacitive element is located do not change with time, then the magnetocapacitance of the magnetocapacitive element does not change with time (dC / dt=0), and the magnetomotive force of the magnetocapacitive element about its two ends... With the magnetic flux Φ flowing through it C The port characteristics of the relationship between them are or

[0046] Therefore, based on the fact that the environmental variables of the magnetic circuit in which the magnetocapacitive element is located do not change with time, and the magnetocapacitance value of the magnetocapacitive element does not change with time, when the magnetic circuit in which the magnetocapacitive element is located is excited by a stable sinusoidal magnetomotive force, the magnetomotive force of the magnetocapacitive element about its two ends can be obtained according to the phasor method. phasor With the magnetic flux Φ flowing through it C phasor The port characteristics of the relationship between them are Represents the phasor of the magnetomotive force at both ends of the magnetocaloric element The phase of the magnetic flux phasor leading the magnetic capacitor element The phase of , where j represents the imaginary unit.

[0047] The magnetocapacitive element proposed in this invention can quantitatively represent the hysteresis loss caused by the hysteresis phenomenon of magnetic materials under alternating magnetic flux. It also affects the phase between the magnetomotive force and the magnetic flux, causing the magnetomotive force of the magnetocapacitive element to lead the magnetic flux.

[0048] When a magnetocapacitive element is applied in a magnetic circuit, it impedes alternating magnetic flux in the circuit but does not impede constant magnetic flux. Therefore, the corresponding magnetocapacitive reactance of the magnetocapacitive element is... Magnetoresistive reactance Magnetocalor is used to describe the magnitude of resistance of a magnetocaloric element to alternating magnetic flux in its magnetic circuit. The unit is A / Wb; when the magnetic circuit of the magnetocapacitive element is excited by a stable sinusoidal magnetomotive force, the magnetocapacitance value of the magnetocapacitive element is used as the reference value. The capacitance value C decreases as the magnetic source angular frequency ω increases; according to the magnetocapacitive reactance... Magnetoresistive reactance The magnetocapacitive reactance remains constant and is independent of the magnetic source angular frequency ω corresponding to the magnetic circuit. It is determined by the length h, cross-sectional area A, permeability μ, and hysteresis angle γ of the magnetic capacitor element.

[0049] Based on the above definitions, calculation formulas, and port characteristic design of magnetocapacitive elements, further design methods for the application of magnetocapacitive elements are proposed, such as... Figure 1 As shown, the specific design consists of a magnetic capacitor, a magnetic reluctance element, a magnetic induction element, and a magnetic source connected in series to form the target magnetic circuit. The target magnetic circuit satisfies Kirchhoff's magnetomotive force law and Kirchhoff's flux law of vector magnetic circuit theory, as well as magnetic circuit theorems of vector magnetic circuit theory such as Thevenin's theorem, Norton's theorem, and substitution theorem.

[0050] Among them, Kirchhoff's magnetomotive force law regarding vector magnetic circuit theory, i.e., the magnetomotive force of the target magnetic circuit. in, These represent the magnetomotive forces across the ends of the reluctance element, the magnetic induction element, and the magnetocaloric element, respectively. This indicates the magnetoresistive value of a magnetoresistive element. This indicates the magnetic flux density of the magnetic sensing element. This represents the magnetic flux flowing through the magnetoresistive element. This represents the magnetic flux flowing through the magnetic induction element. Since the magnetocapacitive element, magnetoresistive element, and magnetic induction element are connected in series, therefore...

[0051] like Figure 1 As shown, when the target magnetic circuit is excited by a stable sinusoidal magnetomotive force, Kirchhoff's magnetomotive force law of vector magnetic circuit theory is obtained according to the phasor method, that is, the magnetomotive force phasor of the target magnetic circuit. in, This represents the phasor of magnetic flux flowing through the magnetoresistive element. It represents the magnetic flux phasor flowing through the magnetic induction element.

[0052] When the designed target magnetic circuit is applied in practice, the magnetic impedance in the target magnetic circuit also needs to be considered. And magnetic impedance value Specifically, magnetoresistance Including magnetoresistance With magnetic resistance Furthermore, magnetic reactance Including magnetic resistance With magnetocapacitive reactance Indicates the magnetic impedance angle of the target magnetic circuit.

[0053] Based on the above design of the magnetocapacitive element and its application in the target magnetic circuit, in practical applications, the magnetocapacitive element's capacitance value is adjusted by selecting the length h, cross-sectional area A, permeability μ, and hysteresis angle γ of the magnetic medium. Alternatively, the capacitance value C represents the magnetic flux Φ flowing through the magnetocapacitive element. C The integral over time t and the magnetomotive force across the magnetic capacitor element The physical meaning of the ratio, and the magnetomotive force of the magnetocapacitive element with respect to its two ends. With the magnetic flux Φ flowing through it C The port characteristics of the relationship between them are used to adjust the magnetocapacitance value of the magnetocapacitive element, thereby changing the strength of the hysteresis phenomenon in the target magnetic circuit, and thus changing the amplitude and phase of the magnetic flux in the magnetic circuit.

[0054] Furthermore, the design of magnetocapacitive elements in the target magnetic circuit can be further improved by adding or removing magnetocapacitive elements in the magnetic circuit to change the strength of the hysteresis phenomenon in the target magnetic circuit, thereby controlling the magnitude of the effect brought about by the hysteresis phenomenon and making the magnetic flux vector state in the target magnetic circuit consistent with the target magnetic flux vector state.

[0055] In practical applications, specifically targeting the magnetic circuit, such as Figure 4 As shown, by following steps A to D, the target magnetic circuit is realized with respect to the preset target magnetic flux phasor. and preset target magnetic impedance angle Adjustments.

[0056] Step A. Based on the magnetic source angular frequency ω of the target magnetic circuit, and The target magnetic circuit satisfies Kirchhoff's magnetomotive force law. Calculate the magnetic reluctance in the target magnetic circuit and according to Calculate the magnetic reactance in the target magnetic circuit And based on the magnetic induction in the target magnetic circuit The neglect of magnetocapacitive reactance in the target magnetic circuit is obtained. Then proceed to step B.

[0057] Step B. Based on magnetocapacitive reactance And the magnetic source angular frequency ω of the target magnetic circuit, and the magnetocapacitance C in the target magnetic circuit is calculated. eq Then proceed to step C.

[0058] Step C. According to the formula Calculate the target magnetic capacitance value C2 corresponding to the target magnetic circuit, and then calculate based on the magnetic capacitance value C in the target magnetic circuit. eq According to C1=1 / (1 / C2-1 / C eq ), obtain the incremental magnetocapacitance value C1 corresponding to the target magnetic circuit, and then proceed to step D.

[0059] Step D. Add a magnetocapacitive element that satisfies the incremental magnetocapacitance value C1 to the target magnetic circuit, so that the target magnetic circuit satisfies the preset target magnetic flux phasor. and preset target magnetic impedance angle

[0060] According to the design of the magnetocapacitive element, step D above is specifically designed to be executed in two ways in practical applications. Firstly, based on the incremental magnetocapacitive value C1 corresponding to the target magnetic circuit, according to the magnetocapacitive value... Select appropriate magnetocaloric elements with suitable length h, cross-sectional area A, permeability μ, and hysteresis angle γ, and add them to the target magnetic circuit so that the target magnetic circuit satisfies the preset target magnetic flux phasor. and preset target magnetic impedance angle

[0061] Secondly, based on the incremental magnetocapacitance value C1 corresponding to the target magnetic circuit, according to... and the magnetomotive force of the added magnetocapacitive element with respect to its two ends With the magnetic flux flowing through it Based on the port characteristics of the relationship between them, select the appropriate magnetocapacitive element and add it to the target magnetic circuit so that the target magnetic circuit meets the preset target magnetic flux phasor. and preset target magnetic impedance angle

[0062] The second design consideration here is the port characteristics during execution. Specifically, when the environmental variables of the magnetic circuit containing the magnetocapacitive element remain constant over time, and the magnetocapacitance of the magnetocapacitive element also remains constant over time, the magnetomotive force of the magnetocapacitive element about its two ends is applied. With the magnetic flux Φ flowing through it C The port characteristics of the relationship between them are or

[0063] In practical applications, once a magnetocapacitor element satisfying the incremental magnetocapacitance value C1 is determined for the target magnetic circuit, if this magnetocapacitor element is composed of multiple sub-magnetocapacitor elements connected in parallel or in series, it is necessary to consider the magnetocapacitance value of each sub-magnetocapacitor element under the series or parallel structure. When n sub-magnetocapacitor elements are connected in series, the overall magnetocapacitance value of the series structure is... like Figure 2 As shown, when n sub-magnetic capacitor elements are connected in parallel, the overall magnetic capacitance value C of the parallel structure is... eq =C1+C2+...+C n-1 +C n ,like Figure 3 As shown.

[0064] Therefore, once the target magnetic circuit is determined to have a magnetocapacitor element satisfying the incremental magnetocapacitor value C1, the composition of the sub-magnetocapacitor elements corresponding to different connection relationships under the incremental magnetocapacitor value C1 can be calculated and determined according to the calculation method of the magnetocapacitor value under the above series-parallel structure. This composition can then be applied to the target magnetic circuit to ensure that the target magnetic circuit satisfies the preset target magnetic flux phasor. and preset target magnetic impedance angle

[0065] In practical applications, based on the target magnetic circuit of the magnetocapacitive element designed in this invention, the reactive power of the target magnetic circuit is... Active power of target magnetic circuit Target magnetic circuit apparent power in, This represents the active power loss generated on the magnetic induction element in the target magnetic circuit, corresponding to the eddy current loss of the target magnetic circuit. This represents the active power loss generated on the magnetocapacitive element in the target magnetic circuit, corresponding to the hysteresis loss of the target magnetic circuit.

[0066] In further applications, when the target magnetic circuit is excited by a stable sinusoidal magnetomotive force, the reactive power of the target magnetic circuit... Active power of target magnetic circuit Active power on magnetic induction element Active power on magnetocapacitive elements

[0067] The above design scheme was applied in practice, and the feasibility of the patent was verified using ANSYS simulation software. A closed ferrite magnetic circuit with an inner diameter of 9.6 mm, an outer diameter of 16.0 mm, and a height of 6.3 mm was constructed in ANSYS simulation. Figure 5 As shown, the eddy current loss in the magnetic circuit is set to 0, corresponding to the magnetic flux density parameters in the magnetic circuit. Set the target magnetic flux amplitude Φ in the magnetic circuit to 0. m 1.26×10 -5 Wb, target magnetic impedance angle By adding magnetocapacitive elements to the magnetic circuit, it can be like... Figure 6 The initial magnetic circuit shown changes as follows Figure 8 The target magnetic circuit shown in the flowchart is as follows: Figure 4 As shown. First, set the magnetomotive force. The amplitude is 20A, the frequency is f = 500kHz, and when the magnetic circuit is running stably, the magnetomotive force is... The waveform of the magnetic flux Φ1 in the magnetic circuit is as follows Figure 8 As shown. According to Kirchhoff's law of magnetomotive force. The equivalent magnetoresistance can be solved. With equivalent magnetic reactance Depend on The initial magnetoresistance angle can be obtained as follows: From the target magnetic impedance angle and formula The target magnetocapacitance value can be obtained as C2 = 9.525 Wb·s / A, so the magnetocapacitance value that should be added in the magnetic circuit is C1 = 1 / (1 / C2 - 1 / C). eq = 15.55 Wb·s / A.

[0068] By arranging and combining the length h, cross-sectional area A, permeability μ, and hysteresis angle γ of the magnetic medium, multiple sets of magnetic media meeting the specified conditions can be obtained. The equivalent magnetic circuit diagram after adding a magnetocaloric element is shown below. Figure 7 As shown, maintain the magnetomotive force in the magnetic circuit. With the amplitude remaining constant at 20A, the magnetomotive force in the transformer's magnetic circuit changes after adding a magnetocapacitive element. The waveform diagram of magnetic flux Φ1 is as follows Figure 7 As shown, the magnetic impedance angle of the transformer's magnetic circuit can be observed at this time. Achieving the target magnetic impedance angle The magnetic flux Φ1 reaches the target magnetic flux amplitude Φ m In addition, a comparison diagram of the hysteresis loop before and after the addition of the magnetocapacitive element was drawn, such as... Figure 9 As shown, by adding a magnetocapacitive element, the area of ​​the hysteresis loop increases, and the hysteresis phenomenon in the magnetic circuit is enhanced, verifying the feasibility of controlling the strength of the hysteresis phenomenon through a magnetocapacitive element.

[0069] The above-mentioned technical solution designs magnetic capacitive elements and application methods, and proposes the definition, calculation formula and port characteristics of magnetic capacitive elements. By adding or reducing magnetic capacitive elements, it is possible to predict and control the strength of hysteresis in vector magnetic circuits and the effects brought about by hysteresis, such as hysteresis loss and remanence.

[0070] Furthermore, in the target magnetic circuit composed of magnetoresistive elements, magnetic induction elements, and magnetocapacitive elements, the magnetoresistive element represents the constant resistance to magnetic flux, the magnetic induction element represents the resistance to alternating magnetic flux due to eddy current effects, and the magnetocapacitive element represents the resistance to alternating magnetic flux due to hysteresis effects. The magnetic circuit parameters corresponding to the three magnetic circuit elements quantitatively characterize the three physical phenomena of magnetoresistive, eddy current, and hysteresis in the magnetic circuit, enabling technicians to change the operating characteristics of the magnetic circuit in a targeted manner and purposefully change the vector magnetic quantity in the magnetic circuit by changing different magnetic circuit parameters.

[0071] Furthermore, for the target magnetic circuit, expressions for the active and reactive power of the target magnetic circuit are proposed. In the target magnetic circuit composed of reluctance element, magnetic induction element, and magnetic capacitance element, the reluctance element corresponds to the reactive power, the magnetic induction element corresponds to the eddy current loss, and the magnetic capacitance element corresponds to the hysteresis loss. Technicians can purposefully adjust the active and reactive power of the magnetic circuit according to the power expressions of the three types of magnetic circuit elements so that the magnetic circuit capacity meets the actual application requirements.

[0072] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A magnetic capacitive element, characterized in that: Based on the length h, cross-sectional area A, permeability μ, hysteresis angle γ, and the magnetic source angular frequency ω of the magnetic circuit in which the magnetic capacitor is located, the capacitance value of the magnetic capacitor is determined. The unit of magnetic capacitance is Ω·s 2 The physical meaning of the magnetocapacitance value C represents the magnetic flux Φ flowing through the magnetocapacitive element. C The integral over time t and the magnetomotive force across the magnetic capacitor element The ratio, i.e. The unit of magnetocapacitance is Wb·s / A; where κ represents the permittivity. - Represents the magnetomotive force at both ends of the magnetic capacitor element With the magnetic flux Φ flowing through the magnetocapacitive element C The reference direction is opposite to the preset reference direction; Based on a magnetocapacitive element structure consisting of at least two sub-magnetic capacitive elements, when n sub-magnetic capacitive elements are connected in series, the overall magnetocapacitance value of the series structure is... When n sub-magnetic capacitor elements are connected in parallel, the overall capacitance value of the parallel structure is C = C1 + C2 + ... + C n-1 +C n .

2. The magnetic capacitive element according to claim 1, characterized in that: If the environmental variables of the magnetic circuit in which the magnetocapacitive element is located change with time, then the magnetocapacitance of the magnetocapacitive element changes with time, and the magnetomotive force of the magnetocapacitive element about its two ends changes. With the magnetic flux Φ flowing through it C The port characteristics of the relationship between them are If the environmental variables of the magnetic circuit in which the magnetocapacitive element is located do not change with time, then the magnetocapacitance of the magnetocapacitive element does not change with time, and the magnetomotive force of the magnetocapacitive element about its two ends... With the magnetic flux Φ flowing through it C The port characteristics of the relationship between them are or 3. The magnetic capacitive element according to claim 2, characterized in that: Since the environmental variables of the magnetic circuit in which the magnetocapacitive element is located do not change with time, and the magnetocapacitance value of the magnetocapacitive element also does not change with time, when the magnetic circuit in which the magnetocapacitive element is located is excited by a stable sinusoidal magnetomotive force, the magnetomotive force of the magnetocapacitive element about its two ends can be obtained according to the phasor method. phasor With the magnetic flux Φ flowing through it C phasor The port characteristics of the relationship between them are Represents the phasor of the magnetomotive force at both ends of the magnetocaloric element The phase of the magnetic flux phasor leading the magnetic capacitor element The phase of , where j represents the imaginary unit.

4. The magnetic capacitive element according to claim 1, characterized in that: If a magnetocapacitive element impedes alternating magnetic flux in its magnetic circuit but does not impede constant magnetic flux, then the corresponding magnetocapacitive reactance of the magnetocapacitive element is... Magnetocalor Magnetocalor is used to describe the magnitude of resistance of a magnetocaloric element to alternating magnetic flux in its magnetic circuit. The unit is A / Wb; when the magnetic circuit of the magnetocapacitive element is excited by a stable sinusoidal magnetomotive force, the magnetocapacitance value of the magnetocapacitive element is used as the reference value. The capacitance value C decreases as the magnetic source angular frequency ω increases; according to the magnetocapacitive reactance... Magnetocalor The magnetocapacitive reactance is independent of the magnetic source angular frequency ω corresponding to the magnetic circuit. It is determined by the length h, cross-sectional area A, permeability μ, and hysteresis angle γ of the magnetic capacitor element.

5. A method for applying a magnetic capacitive element according to any one of claims 1 to 4, characterized in that: The target magnetic circuit is composed of a magnetocapacitive element, a magnetoresistive element, a magnetic induction element, and a magnetic source connected in series, and the target magnetic circuit satisfies Kirchhoff's magnetomotive force law of vector magnetic circuit theory, that is... in, These represent the magnetomotive forces across the ends of the reluctance element, the magnetic induction element, and the magnetocaloric element, respectively. This indicates the reluctance value of the reluctance element. This indicates the magnetic flux density of the magnetic sensing element. This represents the magnetomotive force of the target magnetic circuit. This represents the magnetic flux flowing through the magnetoresistive element. This represents the magnetic flux flowing through the magnetic induction element, and 6. The method for applying a magnetic capacitive element according to claim 5, characterized in that: When the target magnetic circuit is excited by a stable sinusoidal magnetomotive force, Kirchhoff's magnetomotive force law of vector magnetic circuit theory is obtained according to the phasor method, namely... in, The magnetomotive force phasor of the target magnetic circuit. This represents the phasor of magnetic flux flowing through the magnetoresistive element. It represents the magnetic flux phasor flowing through the magnetic induction element.

7. The method for applying a magnetic capacitive element according to claim 5, characterized in that: The target magnetic circuit satisfies Kirchhoff's flux law and the magnetic circuit theorem of vector magnetic circuit theory.

8. The method for applying a magnetic capacitive element according to claim 5, characterized in that: The magnetic impedance in the target magnetic circuit and Wherein, the magnetic impedance Z includes magnetic reluctance With magnetic resistance Magnetic reactance X includes magnetic induction reactance With magnetocapacitive reactance Indicates the magnetic impedance angle of the target magnetic circuit.

9. A method for applying a magnetic capacitive element according to any one of claims 5 to 8, characterized in that, For the target magnetic circuit, follow these steps to achieve the target magnetic flux phasor with respect to the preset target magnetic flux. and preset target magnetic impedance angle Adjustments; Step A. Based on the magnetic source angular frequency ω of the target magnetic circuit, and The target magnetic circuit satisfies Kirchhoff's magnetomotive force law. Calculate the magnetic reluctance in the target magnetic circuit and according to Calculate the magnetic reactance in the target magnetic circuit And based on the magnetic induction in the target magnetic circuit The neglect of magnetocapacitive reactance in the target magnetic circuit is obtained. Then proceed to step B; Step B. Based on magnetocapacitive reactance And the magnetic source angular frequency ω of the target magnetic circuit, and the magnetocapacitance C in the target magnetic circuit is calculated. eq Then proceed to step C; Step C. According to the formula Calculate the target magnetic capacitance value C2 corresponding to the target magnetic circuit, and then calculate based on the magnetic capacitance value C in the target magnetic circuit. eq According to C1=1 / (1 / C2-1 / C eq ), obtain the incremental magnetocapacitance value C1 corresponding to the target magnetic circuit, and then proceed to step D; Step D. Add a magnetocapacitive element that satisfies the incremental magnetocapacitance value C1 to the target magnetic circuit, so that the target magnetic circuit satisfies the preset target magnetic flux phasor. and preset target magnetic impedance angle 10. The method for applying a magnetic capacitive element according to claim 9, characterized in that: In step D, based on the incremental magnetocapacitance value C1 corresponding to the target magnetic circuit, according to the magnetocapacitance value... Select appropriate magnetocaloric elements with suitable length h, cross-sectional area A, permeability μ, and hysteresis angle γ, and add them to the target magnetic circuit so that the target magnetic circuit satisfies the preset target magnetic flux phasor. and preset target magnetic impedance angle Alternatively, based on the incremental magnetocapacitance value C1 corresponding to the target magnetic circuit, according to... and the magnetomotive force of the added magnetocapacitive element with respect to its two ends With the magnetic flux flowing through it Based on the port characteristics of the relationship between them, select the appropriate magnetocapacitive element and add it to the target magnetic circuit so that the target magnetic circuit meets the preset target magnetic flux phasor. and preset target magnetic impedance angle 11. The method for applying a magnetic capacitive element according to claim 9, characterized in that: The reactive power of the target magnetic circuit Active power of target magnetic circuit Target magnetic circuit apparent power in, This represents the active power loss generated on the magnetic induction element in the target magnetic circuit, corresponding to the eddy current loss of the target magnetic circuit; This represents the active power loss generated on the magnetocapacitive element in the target magnetic circuit, corresponding to the hysteresis loss of the target magnetic circuit. When the target magnetic circuit is excited by a stable sinusoidal magnetomotive force, the reactive power of the target magnetic circuit is... Active power of target magnetic circuit Active power on magnetic induction element Active power on magnetocapacitive elements

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