Magnetic capacitor element and application method

Abstract

The present invention relates to a magnetic capacitor element. The design of the magnetic capacitor element is implemented on the basis of the definition of the element, calculation formulas, and port characteristics. By adding or removing a magnetic capacitor element in or from a magnetic circuit, the strength of magnetic hysteresis in a vector magnetic circuit can be estimated and controlled from the perspective of the magnetic circuit, and the magnitude of the effect caused by magnetic hysteresis is controlled, so that a magnetic flux vector state in the magnetic circuit is consistent with a target magnetic flux vector state. Further, on this basis, an application method is proposed. The magnetic capacitor element is connected in series to a magnetic resistor element and a magnetic inductor element to form a target magnetic circuit. Magnetic circuit parameters corresponding to the three magnetic circuit elements quantitatively represent three physical phenomena, i.e., magnetic resistance, eddy current, and magnetic hysteresis, in the magnetic circuit. By changing different magnetic circuit parameters, a technician can change the operating characteristics of the magnetic circuit in a targeted manner, thereby purposefully changing the vector magnetic quantity and magnetic circuit power in the magnetic circuit.

Description

A magnetic capacitance element and application method Technical Field

[0001] The invention relates to a magnetic capacitance element and an application method thereof, belonging to the technical field of magnetic circuit design. Background Art

[0002] Hysteresis and loss characteristics are one of the important characteristics inherent in magnetic materials. At present, 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, studying 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 magnetic materials. This is the hysteresis phenomenon. In order to make the magnetic circuit composed of magnetic materials have better accuracy and be able to simulate various steady-state and transient conditions in the actual magnetic circuit (DC bias, voltage drop, remanence calculation and ferromagnetic resonance), the existing technology has proposed a variety of iron core hysteresis models that take into account the hysteresis phenomenon. Regarding the magnetization phenomenon of ferromagnetic materials, hysteresis models can be divided into four types: ① The hysteresis modeling method derived from micromagnetism theory. This method has clear physical meaning, but the calculation is complex and not suitable for macroscopic applications; ② Macroscopic magnetization theory, based on phenomenological principles, is a pure mathematical modeling. Among them, the more classic is the Preisach model proposed by 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, among which the more classic is the JA hysteresis model jointly proposed by physicists DC Jiles and DLAtherton. This model combines the microstructure of ferromagnetic materials with macroscopic representation to represent the characteristics of ferromagnetic materials. However, identifying the parameters of the JA hysteresis model requires a large amount of experimental data to solve. ④ The neural network hysteresis model has high flexibility and accuracy in simulating hysteresis behavior, but it requires a large amount of data and computing resources, and it is difficult to elucidate the mechanism of its hysteresis phenomenon.

[0004] In summary, current research on magnetic materials still focuses on accurately and efficiently simulating and analyzing the hysteresis and loss characteristics of magnetic materials. However, the ability to predict and control the magnitude of hysteresis in magnetic materials from a magnetic circuit perspective, as well as the effects of hysteresis, such as hysteresis losses and residual magnetism, remain largely unresolved.

[0005] Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a magnetic capacitance element, design the element based on various properties, apply it to the magnetic circuit, change the strength of the hysteresis phenomenon in the magnetic circuit, and control the effect size brought by the hysteresis phenomenon.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention designs a magnetic capacitance element. According to the length h, cross-sectional area A, magnetic permeability μ, hysteresis angle γ of the magnetic capacitance element, and the angular frequency ω of the magnetic source of the magnetic circuit in which the magnetic capacitance element is located, the magnetic capacitance value of the magnetic capacitance element is The unit of magnetic capacitance can be expressed as Ω·s 2 , magnetic capacitance value The physical meaning of the magnetic flux flowing through the magnetic capacitance element is The integral of time t and the magnetomotive force at both ends of the magnetic capacitance element The ratio of The unit of magnetic capacitance is Wb·s / A; where κ represents the dielectric constant, - represents the magnetomotive force at both ends of the magnetic capacitance element The magnetic flux flowing through the magnetic capacitance element The reference direction is opposite to the preset reference direction.

[0008] Based on the structure of the magnetic capacitance element composed of at least two sub-magnetic capacitance elements, when n sub-magnetic capacitance elements are connected in series, the overall magnetic capacitance value of the series structure is When n sub-capacitive components are connected in parallel, the overall capacitance value of the parallel structure is

[0009] As a preferred technical solution of the present invention: if the environmental variables of the magnetic circuit in which the magnetic capacitance element is located change with time, the magnetic capacitance value of the magnetic capacitance element will change with time, and the magnetic capacitance element will change with time about the magnetomotive force at its two ends. and the magnetic flux flowing through it The port characteristics of the relationship between

[0010] If the environmental variables of the magnetic circuit in which the magnetic capacitance element is located do not change with time, the magnetic capacitance value of the magnetic capacitance element will not change with time. and the magnetic flux flowing through it The port characteristics of the relationship between or

[0011] As a preferred technical solution of the present invention: based on the fact that the environmental variables of the magnetic circuit where the magnetic capacitance element is located do not change over time, the magnetic capacitance value of the magnetic capacitance element does not change over time. When the magnetic circuit where the magnetic capacitance element is located is excited by a stable sinusoidal magnetomotive force, the magnetic capacitance element is obtained according to the phasor method with respect to the magnetomotive force at both ends. Phase and the magnetic flux flowing through it Phase The port characteristics of the relationship between Represents the magnetomotive force phasor at both ends of the magnetic capacitance element The phase of the magnetic flux phasor flowing through the magnetic capacitance element is ahead of The phase of , where j represents the imaginary unit.

[0012] As a preferred technical solution of the present invention: the magnetic capacitance element has an obstruction effect on the alternating magnetic flux in the magnetic circuit in which it is located, and has no obstruction effect on the constant magnetic flux in the magnetic circuit in which it is located, then the magnetic capacitance impedance corresponding to the magnetic capacitance element is Magnetic Capacitive Reactance It is used to describe the resistance of a magnetic capacitance element to the alternating magnetic flux in the magnetic circuit in which it is located. The unit is A / Wb; when the magnetic circuit where the magnetic capacitance element is located is excited by a stable sinusoidal magnetomotive force, according to the magnetic capacitance value of the magnetic capacitance element Magnetic capacitance value As the angular frequency ω of the magnetic source increases, it decreases; according to the magnetic capacitance reactance Magnetic capacitance reactance It has nothing to do with the angular frequency ω of the magnetic source corresponding to the magnetic circuit. It is determined by the length h, cross-sectional area A, magnetic permeability μ, and hysteresis angle γ of the magnetic capacitance element.

[0013] Corresponding to the above, the technical problem that the present invention also needs to solve is to provide an application method of a magnetic capacitance element, connecting the magnetoresistive element and the magnetic inductive element in series, and changing the strength of the hysteresis phenomenon in the magnetic circuit through the various properties of the magnetic capacitance element, and controlling the effect size brought by the hysteresis phenomenon, which not only realizes the control of the magnetic flux size, but also can realize the control of the phase between the magnetic flux and the magnetic potential, thereby improving the application efficiency of the magnetic circuit.

[0014] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention designs an application method of a magnetic capacitance element, wherein a target magnetic circuit is formed by connecting a magnetic capacitance element, a magnetic resistance element, a magnetic induction element, and a magnetic source in series, and the target magnetic circuit satisfies Kirchhoff's magnetomotive force law of vector magnetic circuit theory, that is, in, Respectively represent the magnetomotive force at both ends of the magnetoresistive element, magnetic inductive element, and magnetic capacitive element, represents the magnetic resistance value of the magnetoresistive element, Indicates the magnetic induction value of the magnetic induction element, represents the magnetomotive force of the target magnetic circuit, represents the magnetic flux flowing through the magnetoresistive element, represents the magnetic flux flowing through the magnetic sensing element, and

[0015] 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, represents the magnetomotive force phasor of the target magnetic circuit, represents the phasor of magnetic flux flowing through the magnetoresistive element, Represents the phasor of magnetic flux flowing through the magnetic inductive element.

[0016] As a preferred technical solution of the present invention: the target magnetic circuit satisfies Kirchhoff's flux law of vector magnetic circuit theory and the magnetic circuit theorem of vector magnetic circuit theory.

[0017] As a preferred technical solution of the present invention: the magnetic impedance in the target magnetic circuit and Among them, magnetic impedance Including magnetic resistance and magnetic reactance Magnetic resistivity Including magnetic inductive reactance and magnetic capacitance represents the magnetic impedance angle of the target magnetic circuit,

[0018] As a preferred technical solution of the present invention: for the target magnetic circuit, according to the following steps, the target magnetic circuit is realized with respect to the preset target magnetic flux phasor And preset target magnetic impedance angle Adjustment;

[0019] Step A. According to the magnetic source angular frequency ω of the target magnetic circuit, and According to the target magnetic circuit, Kirchhoff's magnetomotive force law is satisfied. Calculate the magnetic resistance in the target magnetic circuit and press Calculate the magnetic reactance in the target magnetic circuit And according to the magnetic induction in the target magnetic circuit Ignore the magnetic capacitance reactance in the target magnetic circuit. Then proceed to step B;

[0020] Step B. Based on the magnetic capacitance reactance And the magnetic source angular frequency ω of the target magnetic circuit, calculate the magnetic capacitance value in the target magnetic circuit Then proceed to step C;

[0021] Step C. According to the formula Calculate the target magnetic capacitance value corresponding to the target magnetic circuit And according to the magnetic capacitance value in the target magnetic circuit according to Obtain the incremental magnetic capacitance value corresponding to the target magnetic circuit Then proceed to step D;

[0022] Step D. Add the incremental magnetic capacitance value to the target magnetic circuit The magnetic capacitance element makes the target magnetic circuit meet the preset target flux phasor And preset target magnetic impedance angle

[0023] As a preferred technical solution of the present invention: in step D, according to the incremental magnetic capacitance value corresponding to the target magnetic circuit By magnetic capacitance value Select the additional magnetic capacitance element with the corresponding length h, cross-sectional area A, magnetic permeability μ, and hysteresis angle γ, and add it to the target magnetic circuit so that the target magnetic circuit meets the preset target flux phasor And preset target magnetic impedance angle

[0024] Or according to the incremental magnetic capacitance value corresponding to the target magnetic circuit according to And the added magnetic capacitance element about the magnetomotive force at both ends and the magnetic flux flowing through it The port characteristics of the relationship between them are selected, and the corresponding magnetic capacitance components are added to the target magnetic circuit so that the target magnetic circuit meets the preset target flux phasor. And preset target magnetic impedance angle

[0025] As a preferred technical solution of the present invention: the target magnetic circuit reactive power Target magnetic circuit active power Target magnetic circuit apparent power in, Indicates the active power loss generated by the magnetic induction element in the target magnetic circuit, corresponding to the eddy current loss of the target magnetic circuit; Indicates the active power loss generated by the magnetic capacitance element in the target magnetic circuit, corresponding to the hysteresis loss of the target magnetic circuit;

[0026] When the target magnetic circuit is excited by a stable sinusoidal magnetomotive force, the target magnetic circuit reactive power Target magnetic circuit active power Active power on the magnetic inductive element Active power on magnetic and capacitive components

[0027] The magnetic capacitance element and application method described in the present invention, using the above technical solution, have the following technical effects compared with the prior art:

[0028] (1) The present invention designs a magnetic capacitance element and its application method, proposes a definition, calculation formula, and port characteristics of the magnetic capacitance element, and by adding or reducing magnetic capacitance elements, can estimate and control the strength of the hysteresis phenomenon in the vector magnetic circuit from the perspective of the magnetic circuit, as well as the effects of the hysteresis phenomenon, such as hysteresis loss and residual magnetism.

[0029] (2) The present invention designs a magnetic capacitance element and an application method. In a target magnetic circuit composed of a magnetic resistance element, a magnetic induction element, and a magnetic capacitance element, the magnetic resistance element represents a constant obstruction to the magnetic flux, the magnetic induction element represents the obstruction of the eddy current effect to the alternating magnetic flux, and the magnetic capacitance element represents the obstruction of the hysteresis effect to the alternating magnetic flux. The magnetic circuit parameters corresponding to the three magnetic circuit elements quantitatively characterize the three physical phenomena of magnetic resistance, 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 purposefully change the vector magnetic quantity in the magnetic circuit by changing different magnetic circuit parameters.

[0030] (3) The present invention designs a magnetic capacitance element and an application method, and proposes expressions for the active power and reactive power of the target magnetic circuit. In the target magnetic circuit composed of a magnetic resistance element, a magnetic induction element, and a magnetic capacitance element, the magnetic resistance element corresponds to reactive power, the magnetic induction element corresponds to eddy current loss, and the magnetic capacitance element corresponds to hysteresis loss. Technicians can purposefully adjust the active power and reactive power of the magnetic circuit based on the power expressions of the three magnetic circuit elements, so that the magnetic circuit capacity meets the actual application requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic diagram of a magnetic capacitance element and a target magnetic circuit according to the present invention;

[0032] FIG2 is a schematic diagram of a plurality of magnetic capacitance elements connected in series according to the present invention;

[0033] FIG3 is a schematic diagram of a plurality of magnetic capacitance elements connected in parallel according to the present invention;

[0034] FIG4 is a flow chart showing how the magnetic capacitance element of the present invention changes the operating state of the magnetic circuit;

[0035] FIG5 is a diagram of a ferrite magnetic circuit simulation model of the present invention;

[0036] FIG6 is a waveform diagram of the initial magnetomotive force and initial magnetic flux of the magnetic circuit of the present invention;

[0037] FIG7 is an equivalent magnetic circuit diagram of a transformer after adding a magnetic capacitance element according to the present invention;

[0038] FIG8 is a waveform diagram of the magnetomotive force and magnetic flux of the magnetic circuit after adding the magnetic capacitance element of the present invention;

[0039] FIG9 is a comparison diagram of the hysteresis loops of the magnetic circuit before and after adding the magnetic capacitance element of the present invention. DETAILED DESCRIPTION

[0040] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] The present invention designs a magnetic capacitance element, a magnetic medium connected in series within a magnetic circuit. Its core concept is to purposefully alter the magnitude of hysteresis within the circuit by adding or removing capacitance elements, thereby changing the operating state of the vector magnetic flux within the circuit. For example, when the magnetic potential within the circuit is stable, the magnitude of the magnetic flux and the phase angle between the magnetic potential and the magnetic flux can be altered by adding capacitance elements to the circuit to control the magnitude of the hysteresis. This allows the magnetic flux vector state within the circuit to align with the target magnetic flux vector state.

[0042] The magnetic capacitance element is physically manifested as a magnetic medium with hysteresis phenomenon, and its symbol is The Lucida Calligraphy font is used here to distinguish the circuit components in the circuit.

[0043] Specifically, the magnetic capacitance element designed here is based on the length h, cross-sectional area A, magnetic permeability μ, hysteresis angle γ, and the magnetic source angular frequency ω of the magnetic circuit in which the magnetic capacitance element is located. As shown in Figure 1, the magnetic capacitance value of the magnetic capacitance element is The unit of magnetic capacitance can be expressed as Ω·s 2 , magnetic capacitance value The physical meaning of the magnetic flux flowing through the magnetic capacitance element is The integral of time t (calculating the effects of demagnetization and magnetization) and the magnetomotive force at both ends of the magnetic capacitance element The ratio of The unit of magnetic capacitance is Wb·s / A; where κ represents the dielectric constant, - represents the magnetomotive force at both ends of the magnetic capacitance element The magnetic flux flowing through the magnetic capacitance element The reference direction is opposite to the preset reference direction.

[0044] Based on the structure of the magnetic capacitance element composed of at least two sub-magnetic capacitance elements, when n sub-magnetic capacitance elements are connected in series, the overall magnetic capacitance value of the series structure is When n sub-capacitive components are connected in parallel, the overall capacitance value of the parallel structure is

[0045] Further design of magnetic capacitance element, if the environmental variables of the magnetic circuit in which the magnetic capacitance element is located change with time, the magnetic capacitance value of the magnetic capacitance element will change with time, and the magnetic capacitance element will change with time about the magnetomotive force at its two ends. and the magnetic flux flowing through it The port characteristics of the relationship between

[0046] If the environmental variables of the magnetic circuit in which the magnetic capacitance element is located do not change over time, the magnetic capacitance value of the magnetic capacitance element will not change over time. The magnetomotive force of a magnetic capacitance element at both ends and the magnetic flux flowing through it The port characteristics of the relationship between or

[0047] Therefore, based on the fact that the environmental variables of the magnetic circuit where the magnetic capacitance element is located do not change with time, the magnetic capacitance value of the magnetic capacitance element does not change with time. When the magnetic circuit where the magnetic capacitance element is located is excited by a stable sinusoidal magnetomotive force, the magnetomotive force of the magnetic capacitance element at both ends is obtained according to the phasor method. Phase and the magnetic flux flowing through it Phase The port characteristics of the relationship between Represents the magnetomotive force phasor at both ends of the magnetic capacitance element The phase of the magnetic flux phasor flowing through the magnetic capacitance element is ahead of The phase of , where j represents the imaginary unit.

[0048] The magnetic capacitance element proposed in the present invention has a magnetic capacitance value that can quantitatively represent the hysteresis loss caused by the hysteresis phenomenon of the magnetic material under alternating magnetic flux. It also affects the phase between the magnetomotive force and the magnetic flux, making the magnetomotive force of the magnetic capacitance element lead the magnetic flux.

[0049] When a magnetic capacitance element is used in a magnetic circuit, it has an obstructive effect on the alternating magnetic flux in the magnetic circuit, and has no obstructive effect on the constant magnetic flux in the magnetic circuit. The magnetic capacitance element corresponds to the magnetic capacitance impedance. Magnetic capacitance reactance It is used to describe the resistance of a magnetic capacitance element to the alternating magnetic flux in the magnetic circuit in which it is located. The unit is A / Wb; when the magnetic circuit where the magnetic capacitance element is located is excited by a stable sinusoidal magnetomotive force, according to the magnetic capacitance value of the magnetic capacitance element Magnetic capacitance value As the angular frequency ω of the magnetic source increases, it decreases; according to the magnetic capacitance reactance Magnetic capacitance reactance It has nothing to do with the angular frequency ω of the magnetic source corresponding to the magnetic circuit and remains constant. It is determined by the length h, cross-sectional area A, magnetic permeability μ, and hysteresis angle γ of the magnetic capacitance element.

[0050] Based on the above definition, calculation formula, and port characteristic design of magnetic capacitance elements, an application method of magnetic capacitance elements is further designed, as shown in FIG1 . Specifically, a target magnetic circuit is formed by connecting a magnetic capacitance element, a magnetic resistance element, a magnetic induction element, and a magnetic source in series, and the target magnetic circuit satisfies Kirchhoff's magnetomotive force law of vector magnetic circuit theory, Kirchhoff's flux law of vector magnetic circuit theory, and magnetic circuit theorems of vector magnetic circuit theory such as Thevenin's theorem, Norton's theorem, and substitution theorem.

[0051] Among them, Kirchhoff's magnetomotive force law about vector magnetic circuit theory, that is, the magnetomotive force of the target magnetic circuit in, Respectively represent the magnetomotive force at both ends of the magnetoresistive element, magnetic inductive element, and magnetic capacitive element, represents the magnetic resistance value of the magnetoresistive element, Indicates the magnetic induction value of the magnetic induction element, represents the magnetic flux flowing through the magnetoresistive element, Represents the magnetic flux flowing through the magnetic induction element, and since the magnetic capacitance element, magnetic resistance element, and magnetic induction element are in series structure,

[0052] As shown in Figure 1, when the target magnetic circuit is excited by a stable sinusoidal magnetomotive force, the Kirchhoff magnetomotive force law of the vector magnetic circuit theory is obtained according to the phasor method, that is, the magnetomotive force phasor of the target magnetic circuit is in, represents the phasor of magnetic flux flowing through the magnetoresistive element, It represents the phasor of magnetic flux flowing through the magnetic inductive element.

[0053] When the designed target magnetic circuit is applied in practice, it also involves the consideration of the magnetic impedance in the target magnetic circuit. And the magnetic impedance value Specifically, magnetic impedance Including magnetic resistance and magnetic reactance And further, magnetic reactance Including magnetic inductive reactance and magnetic capacitance represents the magnetic impedance angle of the target magnetic circuit,

[0054] Based on the above design of magnetic capacitance components and their application in target magnetic circuits, in actual applications, magnetic capacitance components are used to adjust the magnetic capacitance value of magnetic capacitance components, or the magnetic capacitance value, by selecting the length h, cross-sectional area A, magnetic permeability μ, and hysteresis angle γ of the magnetic medium. Represents the magnetic flux flowing through the magnetic capacitance element The integral of time t and the magnetomotive force at both ends of the magnetic capacitance element The physical meaning of the ratio, and the magnetic capacitance element about the magnetomotive force at its two ends and the magnetic flux flowing through it The port characteristics of the relationship between them are used to adjust the magnetic capacitance value of the magnetic capacitance element, thereby changing the strength of the hysteresis phenomenon in the target magnetic circuit, and then changing the amplitude and phase of the magnetic flux in the magnetic circuit.

[0055] Furthermore, the design of the magnetic capacitance element in the target magnetic circuit can further change the strength of the hysteresis phenomenon in the target magnetic circuit by adding or reducing the magnetic capacitance element in the magnetic circuit, thereby controlling the effect size brought about by the hysteresis phenomenon, so that the magnetic flux vector state in the target magnetic circuit is consistent with the target magnetic flux vector state.

[0056] In actual application, specifically for the target magnetic circuit, as shown in Figure 4, follow the steps A to D below to achieve the target magnetic circuit with respect to the preset target magnetic flux phasor And preset target magnetic impedance angle adjustments.

[0057] Step A. According to the magnetic source angular frequency ω of the target magnetic circuit, and According to the target magnetic circuit, Kirchhoff's magnetomotive force law is satisfied. Calculate the magnetic resistance in the target magnetic circuit and press Calculate the magnetic reactance in the target magnetic circuit And according to the magnetic induction in the target magnetic circuit Ignore the magnetic capacitance reactance in the target magnetic circuit. Then proceed to step B.

[0058] Step B. Based on the magnetic capacitance reactance And the magnetic source angular frequency ω of the target magnetic circuit, calculate the magnetic capacitance value in the target magnetic circuit Then proceed to step C.

[0059] Step C. According to the formula Calculate the target magnetic capacitance value corresponding to the target magnetic circuit And according to the magnetic capacitance value in the target magnetic circuit according to Obtain the incremental magnetic capacitance value corresponding to the target magnetic circuit Then proceed to step D.

[0060] Step D. Add the incremental magnetic capacitance value to the target magnetic circuit The magnetic capacitance element makes the target magnetic circuit meet the preset target flux phasor And preset target magnetic impedance angle

[0061] According to the design of magnetic capacitance components, the above step D is specifically designed in two practical applications. First, according to the incremental magnetic capacitance value corresponding to the target magnetic circuit, By magnetic capacitance value Select the additional magnetic capacitance element with the corresponding length h, cross-sectional area A, magnetic permeability μ, and hysteresis angle γ, and add it to the target magnetic circuit so that the target magnetic circuit meets the preset target flux phasor And preset target magnetic impedance angle

[0062] Second, according to the incremental magnetic capacitance value corresponding to the target magnetic circuit according to And the added magnetic capacitance element about the magnetomotive force at both ends and the magnetic flux flowing through it The port characteristics of the relationship between them are selected, and the corresponding magnetic capacitance components are added to the target magnetic circuit so that the target magnetic circuit meets the preset target flux phasor. And preset target magnetic impedance angle

[0063] Here, the second design is the port characteristics in execution, that is, when the environmental variables of the magnetic circuit where the magnetic capacitance element is located do not change with time, and the magnetic capacitance value of the magnetic capacitance element does not change with time, the magnetic capacitance element is applied to the magnetomotive force at its two ends. and the magnetic flux flowing through it The port characteristics of the relationship between or

[0064] In actual application, when the target magnetic circuit is determined, the incremental magnetic capacitance value is added. After the magnetic capacitance element, if the magnetic capacitance element here is composed of multiple sub-magnetic capacitance elements connected in parallel or multiple sub-magnetic capacitance elements connected in series, it is necessary to consider the magnetic capacitance value of each sub-magnetic capacitance element in the series or parallel structure. When n sub-magnetic capacitance elements are connected in series, the magnetic capacitance value of the entire series structure is As shown in Figure 2, when n sub-capacitive components are connected in parallel, the overall capacitance value C of the parallel structure is eq =C1+C2+...+C n-1 +C n , as shown in Figure 3.

[0065] Therefore, when the target magnetic circuit is determined, the incremental magnetic capacitance value is added. After the magnetic capacitance components are connected, the incremental magnetic capacitance value can be calculated according to the calculation method of the magnetic capacitance value under the series-parallel structure mentioned above. The composition of the sub-magnetic capacitance elements under different connection relationships is then applied to the target magnetic circuit so that the target magnetic circuit meets the preset target flux phasor. And preset target magnetic impedance angle

[0066] In actual application, the target magnetic circuit under the application of the magnetic capacitance element designed by the present invention, wherein the target magnetic circuit reactive power Target magnetic circuit active power Target magnetic circuit apparent power in, Indicates the active power loss generated by the magnetic induction element in the target magnetic circuit, corresponding to the eddy current loss of the target magnetic circuit. It represents the active power loss generated by the magnetic capacitance element in the target magnetic circuit, corresponding to the hysteresis loss of the target magnetic circuit.

[0067] In further applications, when the target magnetic circuit is excited by a stable sinusoidal magnetomotive force, the target magnetic circuit reactive power Target magnetic circuit active power Active power on the magnetic inductive element Active power on magnetic and capacitive components

[0068] The above design scheme was applied in practice. Specifically, the feasibility of the patent was verified by ANSYS simulation software. A closed ferrite magnetic circuit with an inner diameter of 9.6mm, an outer diameter of 16.0mm and a height of 6.3mm was constructed in ANSYS simulation. As shown in Figure 5, the eddy current loss in the magnetic circuit was set to 0, corresponding to the magnetic induction parameters in the magnetic circuit. is 0. Set the target magnetic flux amplitude Φ in the magnetic circuit m 1.26×10 -5 Wb, target magnetic impedance angle By adding magnetic capacitance elements to the magnetic circuit, the initial magnetic circuit shown in FIG6 is changed into the target magnetic circuit shown in FIG8, and the flow chart is shown in FIG4. First, set the magnetomotive force The amplitude is 20A, the frequency is f=500kHz, when the magnetic circuit is running stably, the magnetomotive force The waveform of the magnetic flux Φ1 is shown in Figure 8. According to Kirchhoff's magnetomotive force law The equivalent magnetic resistance can be solved Equivalent magnetic reactance Depend on The initial magnetic impedance angle can be obtained as By the target magnetic impedance angle and formula The target magnetic capacitance value can be obtained as Therefore, the magnetic capacitance value that should be added in the magnetic circuit is

[0069] By permuting and combining the length h, cross-sectional area A, magnetic permeability μ, and hysteresis angle γ of the magnetic medium, multiple groups of magnetic media that meet the conditions can be obtained. The equivalent magnetic circuit diagram after adding the magnetic capacitance element is shown in Figure 7, maintaining the magnetomotive force in the magnetic circuit. The amplitude is 20A. After adding magnetic capacitance components, the magnetic potential in the transformer magnetic circuit is The waveform of the magnetic flux Φ1 is shown in Figure 7. It can be seen that the magnetic impedance angle of the transformer magnetic circuit at this time is Reaching the target magnetic impedance angle The magnetic flux Φ1 reaches the target magnetic flux amplitude Φ m In addition, a comparison of the hysteresis loops before and after the addition of the magnetic capacitance element was plotted, as shown in Figure 9. By adding the magnetic capacitance 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 the magnetic capacitance element.

[0070] The magnetic capacitance element and application method designed in the above technical solution propose the definition, calculation formula, and port characteristics of the magnetic capacitance element. By adding or reducing magnetic capacitance elements, the strength of the hysteresis phenomenon in the vector magnetic circuit and the effects caused by the hysteresis phenomenon, such as hysteresis loss and residual magnetism effect, can be predicted and controlled from the perspective of the magnetic circuit.

[0071] Moreover, in the target magnetic circuit composed of magnetic resistance elements, magnetic induction elements and magnetic capacitance elements, the magnetic resistance elements represent the constant resistance to the magnetic flux, the magnetic induction elements represent the resistance of the eddy current effect to the alternating magnetic flux, and the magnetic capacitance elements represent the resistance of the hysteresis effect to the alternating magnetic flux. The magnetic circuit parameters corresponding to the three magnetic circuit elements quantitatively characterize the three physical phenomena of magnetic resistance, 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 according to changes in different magnetic circuit parameters.

[0072] In addition, for the target magnetic circuit, expressions for the active power and reactive power of the target magnetic circuit are proposed. In the target magnetic circuit composed of magnetic resistance elements, magnetic induction elements, and magnetic capacitance elements, the magnetic resistance elements correspond to reactive power, the magnetic induction elements correspond to eddy current losses, and the magnetic capacitance elements correspond to hysteresis losses. Technicians can purposefully adjust the active power and reactive power of the magnetic circuit based on the power expressions of the three magnetic circuit elements, so that the magnetic circuit capacity meets the actual application needs.

[0073] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the spirit of the present invention.

Claims

1. A magnetic capacitance component, characterized in that: According to the length h, cross-sectional area A, magnetic permeability μ, hysteresis angle γ of the magnetic capacitance element, and the angular frequency ω of the magnetic source of the magnetic circuit in which the magnetic capacitance element is located, the magnetic capacitance value of the magnetic capacitance element is The unit of magnetic capacitance can be expressed as Ω·s 2 The physical meaning of the magnetic capacitance value C represents the magnetic flux Φ flowing through the magnetic capacitance element. C The integral of time t and the magnetomotive force at both ends of the magnetic capacitance element The ratio of The unit of magnetic capacitance is Wb·s / A; where κ represents the dielectric constant, - represents the magnetomotive force at both ends of the magnetic capacitance element The magnetic flux Φ flowing through the magnetic capacitance element C The reference direction is opposite to the preset reference direction; Based on the structure of the magnetic capacitance element composed of at least two sub-magnetic capacitance elements, when n sub-magnetic capacitance elements are connected in series, the overall magnetic capacitance value of the series structure is When n sub-capacitors are connected in parallel, the overall capacitance of the parallel structure is C = C1 + C2 + ... + C n-1 +C n .

2. A magnetic capacitance element according to claim 1, characterized in that: If the environmental variables of the magnetic circuit in which the magnetic capacitance element is located change with time, the magnetic capacitance value of the magnetic capacitance element will change with time. and the magnetic flux Φ flowing through it C The port characteristics of the relationship between If the environmental variables of the magnetic circuit in which the magnetic capacitance element is located do not change over time, then the magnetic capacitance value of the magnetic capacitance element does not change over time. and the magnetic flux Φ flowing through it C The port characteristics of the relationship between or 3. A magnetic capacitance element according to claim 2, characterized in that: Based on the fact that the environmental variables of the magnetic circuit where the magnetic capacitance element is located do not change with time, the magnetic capacitance value of the magnetic capacitance element does not change with time. When the magnetic circuit where the magnetic capacitance element is located is excited by a stable sinusoidal magnetomotive force, the magnetomotive force of the magnetic capacitance element at both ends is obtained according to the phasor method. The phasor and the magnetic flux Φ flowing through it C The phasor The port characteristics of the relationship between Represents the magnetomotive force phasor at both ends of the magnetic capacitance element The phase of the magnetic flux phasor flowing through the magnetic capacitance element is ahead of The phase of , where j represents the imaginary unit.

4. The magnetic capacitance element according to claim 1, characterized in that: The magnetic capacitance element has an obstruction effect on the alternating magnetic flux in the magnetic circuit in which it is located, and has no obstruction effect on the constant magnetic flux in the magnetic circuit in which it is located. The magnetic capacitance impedance corresponding to the magnetic capacitance element is Magnetic Capacitance It is used to describe the resistance of a magnetic capacitance element to the alternating magnetic flux in the magnetic circuit in which it is located. The unit is A / Wb; when the magnetic circuit in which the magnetic capacitance element is located is excited by a stable sinusoidal magnetomotive force, according to the magnetic capacitance value of the magnetic capacitance element The magnetic capacitance value C decreases with the increase of the angular frequency ω of the magnetic source; according to the magnetic capacitance reactance Magnetic Capacitance It has nothing to do with the angular frequency ω of the magnetic source corresponding to the magnetic circuit. It is determined by the length h, cross-sectional area A, magnetic permeability μ, and hysteresis angle γ of the magnetic capacitance element.

5. The application method of a magnetic capacitance element according to any one of claims 1 to 4, characterized in that: The target magnetic circuit is composed of a magnetic capacitance element, a magnetic resistance 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, Respectively represent the magnetomotive force at both ends of the magnetoresistive element, the magnetic inductive element, and the magnetic capacitive element, represents the magnetic resistance value of the magnetoresistive element, Indicates the magnetic induction value of the magnetic sensing element, represents the magnetomotive force of the target magnetic circuit, represents the magnetic flux flowing through the magnetoresistive element, represents the magnetic flux flowing through the magnetic sensing element, and 6. According to claim 5, the application method of the magnetic capacitance element according to claim 1 is 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, that is, in, represents the magnetomotive force phasor of the target magnetic circuit, represents the phasor of magnetic flux flowing through the magnetoresistive element, Represents the phasor of magnetic flux flowing through the magnetic sensing element.

7. According to claim 5, the application method of the magnetic capacitance element according to claim 1 is characterized in that: The target magnetic circuit satisfies Kirchhoff's flux law of vector magnetic circuit theory and the magnetic circuit theorem of vector magnetic circuit theory.

8. According to claim 5, the application method of the magnetic capacitance element according to claim 1 is characterized in that: The magnetic impedance in the target magnetic circuit and Among them, magnetic impedance Including magnetic resistance With magnetic impedance Magnetic impedance Including magnetic reactance With magnetic capacitance represents the magnetic impedance angle of the target magnetic circuit, 9. The application method of a magnetic capacitance element according to any one of claims 5 to 8, characterized in that: For the target magnetic circuit, follow the steps below to achieve the target magnetic circuit with respect to the preset target flux phasor And preset target magnetic impedance angle Adjustment of Step A. According to the magnetic source angular frequency ω of the target magnetic circuit, and According to the target magnetic circuit to meet the requirements of Kirchhoff Magnetomotive force law Calculate the magnetic resistance in the target magnetic circuit and press Calculate the magnetic reactance in the target magnetic circuit And according to the magnetic induction in the target magnetic circuit Ignore the magnetic capacitive reactance in the target magnetic circuit. Then proceed to step B; Step B. Based on the magnetic capacitance And the magnetic source angular frequency ω of the target magnetic circuit, calculate the magnetic capacitance value C in the target magnetic circuit 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 according to the magnetic capacitance value C in the target magnetic circuit eq , according to C1=1 / (1 / C2-1 / C eq ), obtain the incremental magnetic capacitance value C1 corresponding to the target magnetic circuit, and then enter step D; Step D: Add a magnetic capacitance element that satisfies the incremental magnetic capacitance 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 application method of a magnetic capacitance element according to claim 9, characterized in that: In step D, according to the incremental magnetic capacitance value C1 corresponding to the target magnetic circuit, the magnetic capacitance value Select the additional magnetic capacitance element with the corresponding length h, cross-sectional area A, magnetic permeability μ, and magnetic hysteresis angle γ, 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 Or according to the incremental magnetic capacitance value C1 corresponding to the target magnetic circuit, press And the added magnetic capacitance element about the magnetomotive force at both ends and the magnetic flux flowing through it The port characteristics of the relationship between them are selected, and the corresponding magnetic capacitance components are added to the target magnetic circuit so that the target magnetic circuit meets the preset target flux phasor. And preset target magnetic impedance angle 11. The application method of a magnetic capacitance element according to claim 9, characterized in that: The target magnetic circuit reactive power Target magnetic circuit active power Target magnetic circuit apparent power in, It indicates 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; It represents the active power loss generated on the magnetic capacitance 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 magnetic motive force, the target magnetic circuit reactive power Target magnetic circuit active power Active power on magnetic induction element Active power on magnetic and capacitive components

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