Magnetic circuit magneto-impedance adjustment method based on composite magnetic inductor

Abstract

The present invention relates to the technical fields of power generation, power transformation or power distribution. Disclosed is a magnetic circuit magneto-impedance adjustment method based on a composite magnetic inductor, relating to magnetic circuit control technology, in particular to a magneto-impedance adjustment method. According to the present invention, a magneto-impedance adjustment target is formulated on the basis of conditions and requirements of an application scenario, and magneto-impedance change characteristics, such as the amount or direction of change in amplitude and phase angle, are obtained on the basis of a vector magnetic circuit theory; and the type and numerical value of equivalent electrical impedance Z2 of the magneto-impedance of the composite magnetic inductor are adjusted or optimized on the basis of the type requirements of the application scenario on a magneto-impedance change amount Z2.The adjustment of magnetic circuit magneto-impedance is crucial for improving the performance of a power system and an electromagnetic device, and the present invention provides a more convenient and flexible solution for realizing accurate control and performance improvement of a magnetic circuit.

Description

Magnetic circuit magnetic impedance adjustment method based on composite magnetic induction Technical Field

[0001] The present invention relates to magnetic circuit control technology, in particular to a method for adjusting magnetic circuit impedance, and specifically discloses a method for adjusting magnetic circuit impedance based on composite magnetic induction, belonging to the technical field of power generation, power transformation or power distribution. Background Art

[0002] Magnetic circuit impedance is a key factor in determining the shape and strength of the magnetic field distribution within a magnetic circuit. Precisely controlling the amplitude and phase of the magnetic flux within the magnetic circuit is crucial in power systems, motor control, and other electromagnetic devices. Regulating magnetic circuit impedance not only improves equipment efficiency and stability, but also reduces energy loss and enhances electromagnetic compatibility and interference immunity.

[0003] The scalar magnetic circuit method plays an indispensable role in electromagnetic analysis. As a mainstream magnetic circuit calculation method, it is included in textbooks both domestically and internationally. Scalar reluctance is used to describe the resistance to magnetic flux. However, due to the phase difference between magnetic potential and magnetic flux, the magnetic circuit must contain inductive or capacitive elements, not just the resistive element of reluctance.

[0004] Existing methods for adjusting magnetic circuit impedance primarily focus on adjusting reluctance by altering the magnetic permeability of the magnetic material, changing the magnetic circuit geometry, or changing the air gap length. These methods are inflexible, costly, and limited to the magnetic circuit design phase. Currently, methods for regulating reluctance involve adding magnetic induction elements to the magnetic circuit. However, magnetic induction only increases the reluctance of the magnetic circuit, without changing or reducing it. In short, methods for adjusting magnetic circuit impedance are relatively inadequate.

[0005] The present invention aims to propose a magnetic circuit impedance adjustment method based on composite magnetic induction to overcome the above-mentioned defects.

[0006] Summary of the Invention

[0007] The purpose of the present invention is to address the shortcomings of the above-mentioned background technology and provide a method for adjusting the magnetic impedance of a magnetic circuit based on composite magnetic induction, so as to solve the technical problems that the existing magnetic circuit impedance adjustment technology is limited to the design stage and the adjustment method is inflexible, and to achieve the purpose of the invention of flexibly and efficiently adjusting the magnetic circuit impedance during the magnetic circuit design and application stages.

[0008] The present invention adopts the following technical solutions to achieve the above-mentioned purpose:

[0009] A magnetic circuit magnetic impedance adjustment method based on composite magnetic inductance, wherein the composite magnetic inductance is composed of a magnetic inductor electrically connected to an electromagnetic element, comprises the following steps:

[0010] Step S1, calculating the magnetic impedance before adjustment based on vector magnetic circuit theory;

[0011] Step S2, determining an optimization target for magnetic impedance adjustment and calculating a target magnetic impedance, wherein the optimization target for magnetic impedance adjustment includes: an optimization value of a magnetic impedance variation characteristic and / or an optimization direction of a magnetic impedance variation characteristic;

[0012] Step S3, calculating the magnetic impedance change or obtaining the positive or negative sign of the magnetic impedance change characteristic based on the magnetic impedance before adjustment, the target magnetic impedance and the optimization target;

[0013] Step S4, initializing the parameters of the magnetic inductance in the composite magnetic inductance, and obtaining the equivalent electrical impedance of the composite magnetic inductance according to the magnetic impedance change calculated in step S3 or the positive or negative sign of the obtained magnetic impedance change characteristic;

[0014] Step S5, selecting the type of electromagnetic element and determining the parameters of the electromagnetic element according to the resistance and reactance in the electrical impedance of the electromagnetic element in the composite magnetic inductor, to form the composite magnetic inductor;

[0015] Step S6, when the electromagnetic element determined in step S5 can be obtained, determining that the magnetic induction and the selected electromagnetic element form an optimal composite magnetic induction, and proceeding to step S7; otherwise, returning to step S4 and adjusting the parameters of the magnetic induction in the composite magnetic induction;

[0016] Step S7, adding the optimal composite magnetic induction determined in step S6 to the magnetic circuit.

[0017] As a further optimization scheme of the magnetic circuit magnetic impedance adjustment method based on composite magnetic induction, the electromagnetic element is a fixed or adjustable physical element, and the fixed or adjustable physical elements include but are not limited to: resistors, inductors, capacitors, negative resistance circuits, transformers, controlled sources, operational amplifiers, and switching devices.

[0018] As a further optimization scheme of the magnetic circuit magnetic impedance adjustment method based on composite magnetic induction, step S1 calculates the magnetic impedance before adjustment based on the vector magnetic circuit theory as follows: in, is the magnetic impedance before adjustment, θ1, In order to adjust the phase angle, magnetic resistance, magnetic reactance and magnetic induction of the front magnetic impedance, without considering the hysteresis effect and magnetic density saturation, This formula applies to sine.

[0019] As a further optimization scheme of the magnetic circuit magnetic impedance adjustment method based on composite magnetic induction, in step S2, the optimization value of the magnetic impedance change characteristic includes but is not limited to: the determined value of at least one change characteristic of the magnetic impedance modulus, phase angle, magnetic resistance, and magnetic reactance, and the optimization direction of the magnetic impedance change characteristic includes but is not limited to: the change direction of at least one change characteristic of the magnetic impedance modulus, phase angle, magnetic resistance, and magnetic reactance.

[0020] As a further optimization scheme of the magnetic circuit magnetic impedance adjustment method based on composite magnetic induction, the specific method of step S3 for calculating the magnetic impedance change or obtaining the positive or negative sign of the magnetic impedance change characteristic based on the magnetic impedance before adjustment and the target magnetic impedance in combination with the optimization target is as follows:

[0021] Step S3A, when the optimization target of magnetic impedance adjustment is the determined value of at least one of the change characteristics of magnetic impedance modulus, phase angle, magnetic resistance, and magnetic reactance, the magnetic impedance change amount is for is the target magnetic impedance, θ is the phase angle of the target magnetic impedance, θ2, The phase angle, magnetic resistance and magnetic reactance of the magnetic impedance change;

[0022] Step S3B, when the optimization target of magnetic impedance adjustment is the change direction of at least one change characteristic of magnetic impedance modulus, phase angle, magnetic resistance, and magnetic reactance, obtain the change amount of the modulus Phase angle change θ-θ1, magnetic resistance change Magnetic reactance change The sign of the change in at least one of the characteristics, Magnetic reluctance and reactance of target magnetic impedance;

[0023] In step S3C, when the optimization target of magnetic impedance regulation is the determined value of one change characteristic and the change direction of another change characteristic, according to the functional relationship between the two change characteristics, the change characteristic of the known change direction is represented by the change characteristic of the known determined value, and the magnetic impedance change amount is calculated using the expression in step S3A.

[0024] As a further optimization scheme of the magnetic circuit magnetic impedance adjustment method based on composite magnetic induction, the specific method of obtaining the equivalent electrical impedance of the composite magnetic induction according to the magnetic impedance change calculated in step S3 or the positive or negative sign of the obtained magnetic impedance change characteristic in step S4 is as follows:

[0025] Step S41, assigning the magnetic impedance of the composite magnetic inductor to the magnetic impedance variation calculated in step S3 Through the expression The magnetic impedance of the composite magnetic inductor composed of a magnetic inductor with a turn number of N2 and a resistance of R2 and an electromagnetic element Equivalent to electrical impedance Z2;

[0026] Step S42A, when the magnetic impedance change is calculated in step S3 When , the equivalent electrical impedance of the composite magnetic induction and magnetic impedance is calculated according to the expression in step S41,

[0027] Step S42B, when S3 obtains the positive or negative of the magnetic impedance change characteristic, the positive or negative of the magnetic resistance change amount and the positive or negative of the magnetic reactance change amount are determined according to the positive or negative of the magnetic impedance change characteristic, and the positive or negative of the resistance in the expression of step S41 is set to the positive or negative of the magnetic reactance change amount, and the positive or negative of the reactance in the expression of step S41 is set to the positive or negative of the magnetic resistance change amount.

[0028] As a further optimization solution of the magnetic circuit magnetic impedance adjustment method based on composite magnetic induction, the specific method of step S5 is:

[0029] Step S5A: When the magnetic impedance variation is obtained by calculation in step S3 When the composite magnetic inductor is used, the type and value of the electromagnetic element in the composite magnetic inductor are selected according to the resistance and reactance of the electromagnetic element impedance Z2-R2 in the composite magnetic inductor;

[0030] Step S5B, when the positive or negative sign of the magnetic impedance change characteristic is obtained in step S3, the type of electromagnetic element in the composite magnetic inductor is selected according to the positive or negative sign of the resistance and reactance of the electrical impedance Z2-R2 of the electromagnetic element in the composite magnetic inductor, the parameter value range of the selected type of electromagnetic element is determined according to the optimization target of the magnetic impedance adjustment, and the parameter value of the selected type of electromagnetic element is selected within the parameter selection range.

[0031] As a further optimization scheme of the magnetic circuit magnetic impedance adjustment method based on composite magnetic induction, the specific method of selecting the type of electromagnetic element in the composite magnetic induction according to the resistance and reactance of the electromagnetic element electrical impedance Z2-R2 in the composite magnetic induction is as follows:

[0032] When the resistance of the electromagnetic element electrical impedance Z2-R2 in the composite magnetic induction is positive, the electromagnetic element in the composite magnetic induction is a resistive element;

[0033] When the resistance of the electromagnetic element electrical impedance Z2-R2 in the composite magnetic induction is negative, the electromagnetic element in the composite magnetic induction uses a negative resistance circuit;

[0034] When the reactance of the electromagnetic element electrical impedance Z2-R2 in the composite magnetic inductor is positive, the electromagnetic element in the composite magnetic inductor is selected as an inductive element;

[0035] When the reactance of the electrical impedance Z2-R2 of the electromagnetic element in the composite magnetic inductor is negative, the electromagnetic element in the composite magnetic inductor is a capacitive element.

[0036] As a further optimization scheme of the magnetic circuit magnetic impedance adjustment method based on composite magnetic inductance, when the goal of the magnetic impedance adjustment optimization is to reduce the modulus of the magnetic impedance, step S5B determines the following four types of composite magnetic inductance configuration schemes based on the resistance and reactance of the electromagnetic element impedance Z2-R2 in the composite magnetic inductance:

[0037] The composite magnetic inductor is composed of a magnetic inductor electrically connected to a capacitor element, and the magnetic inductor parameters and the capacitor element parameters meet

[0038] The composite magnetic inductor is composed of a magnetic inductor electrically connected to a negative resistance circuit with a resistance value less than -R2;

[0039] The composite magnetic inductor is composed of a magnetic inductor electrically connected to a capacitor and a negative resistor with a resistance value less than -R2;

[0040] The composite magnetic inductance is made by the magnetic inductance electrical connection The magnetic resistance and / or reactance is negative and of electromagnetic components.

[0041] As a further optimization scheme of the magnetic circuit magnetic impedance adjustment method based on composite magnetic inductance, when the goal of the magnetic impedance adjustment optimization is to increase the modulus of the magnetic impedance, step S5B determines the following two types of composite magnetic inductance composition schemes based on the resistance and reactance of the electromagnetic element impedance Z2-R2 in the composite magnetic inductance:

[0042] The composite magnetic inductance is made by the magnetic inductance electrical connection The electromagnetic components are composed of

[0043] The composite magnetic induction includes only the magnetic induction.

[0044] The present invention adopts the above technical solution and has the following beneficial effects:

[0045] (1) The present invention provides a more flexible, efficient and simple method for adjusting the magnetic circuit impedance. According to the adjustment requirements of the magnetic impedance, the change amount of the magnetic impedance after adjustment or the change direction of the magnetic impedance change characteristics of the magnetic circuit is obtained. Then, the positive and negative signs of the magnetic impedance change amount or the magnetic impedance change characteristics are calculated in combination with the optimization target, and the magnetic impedance of the composite magnetic inductor is equivalent to the electrical impedance. Finally, according to the electrical impedance of the electromagnetic components in the composite magnetic inductor, the type and parameters of the electromagnetic components in the composite magnetic inductor are selected, and a composite magnetic inductor with the corresponding magnetic impedance size or change direction is added to the magnetic circuit to meet the adjustment optimization target of the magnetic circuit.

[0046] (2) The present invention provides a more flexible and efficient solution for magnetic circuit design and application. By selecting the optimization target to adjust the magnetic reactance and the magnetic resistance at the same time, the magnetic resistance and / or magnetic reactance can be increased, unchanged, or decreased, and the amplitude and phase of the magnetic circuit variables can be precisely controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] FIG1 shows the magnetic circuit model and equivalent magnetic circuit after the composite magnetic induction is added to the magnetic circuit magnetic impedance adjustment method proposed by the present invention.

[0048] FIG2 is a flow chart of the method for adjusting magnetic impedance of a magnetic circuit based on composite magnetic induction according to the present invention.

[0049] Figure 3 is the equivalent magnetic circuit diagram of the vector magnetic circuit theory.

[0050] FIG4 is a simulation model diagram of the magnetic impedance adjustment method proposed in the present invention after adding a composite magnetic inductance to the magnetic circuit.

[0051] FIG5 shows the magnetic impedance and change rate of the front and rear magnetic circuits adjusted at different frequencies according to the present invention. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the present invention more clear, the technical solution of the present invention is further described in detail below with reference to the accompanying drawings.

[0053] The magnetic impedance adjustment method based on composite magnetic induction proposed in the present invention obtains the change characteristics of magnetic impedance based on vector magnetic circuit theory according to the conditions and requirements of the application scenario. The change characteristics of magnetic impedance include the change amount or change direction of magnetic impedance amplitude and phase angle; according to the change amount of magnetic impedance Type, select the corresponding electromagnetic components, magnetic impedance change The types include positive magnetic reactance, negative magnetic reactance, positive magnetic resistance, and negative magnetic resistance. Electromagnetic elements include but are not limited to: resistors, inductors, capacitors, and negative resistance circuits. A composite magnetic inductance composed of magnetic induction and electromagnetic elements is added to the magnetic circuit. By adjusting the equivalent electrical impedance Z2 of the composite magnetic inductance and magnetic impedance, the magnetic circuit impedance can be adjusted or optimized.

[0054] Vector magnetic circuit theory can more accurately describe the resistance to magnetic flux and express the relationship between magnetic flux and magnetic potential. In the technical solution adopted by the present invention, vector magnetic impedance is used instead of scalar magnetic resistance to improve the calculation accuracy of the magnetic circuit. The vector magnetic circuit theory involved in this invention uses vector magnetic impedance to describe the resistance to magnetic flux passing through the magnetic circuit. The angle between the magnetic potential and the magnetic flux in the magnetic circuit is the phase angle of the magnetic circuit impedance. Figure 3 shows the equivalent magnetic circuit diagram of the vector magnetic circuit theory.

[0055] in, is the magnetic potential, Φ is the magnetic flux, θ are magnetic circuit impedance, magnetic resistance, magnetic reactance, magnetic induction, and magnetic impedance angle, respectively, and j is an imaginary unit. This calculation formula is applicable to sinusoidal excitation, without considering the hysteresis effect and magnetic density saturation. ω is the angular frequency of the magnetic flux change.

[0056] FIG2 is a flow chart of the magnetic circuit impedance adjustment method based on composite magnetic induction according to the present invention. The specific process of magnetic impedance adjustment is as follows, including S1 to S7.

[0057] S1. Calculate the magnetic impedance before adjustment based on vector magnetic circuit theory

[0058] According to the magnetic impedance before adjustment The modulus and phase angle θ1 are used to calculate the magnetic resistance before adjustment. Magnetic resistivity Magnetic induction Calculate the magnetic resistance before adjustment Magnetic resistivity Magnetic induction The formula is:

[0059] S2. Determine the optimization target of magnetic impedance adjustment and calculate the target magnetic impedance

[0060] The optimization objectives of magnetic impedance regulation include: an optimized value of a magnetic impedance variation characteristic and / or an optimized direction of a magnetic impedance variation characteristic. The optimized value of a magnetic impedance variation characteristic includes, but is not limited to, a determined value of at least one variation characteristic of the magnetic impedance modulus, phase angle, magnetic resistance, and magnetic reactance. The optimized direction of a magnetic impedance variation characteristic includes, but is not limited to, a change direction of at least one variation characteristic of the magnetic impedance modulus, phase angle, magnetic resistance, and magnetic reactance. For example, the optimization objective of magnetic impedance regulation may be a determined value of at least one magnetic impedance variation characteristic, or a change direction of at least one magnetic impedance variation characteristic, or a determined value of a magnetic impedance variation characteristic and a change direction of a magnetic impedance variation characteristic.

[0061] Calculate target magnetic impedance The formula is:

[0062] S3, calculate the magnetic impedance change Z2 or obtain the positive and negative magnetic impedance change characteristics based on the magnetic impedance before adjustment, the target magnetic impedance and the optimization target

[0063] S3A. The optimization goal of magnetic impedance regulation is to determine the change in magnetic impedance when at least one of the four change characteristics of magnetic impedance modulus, phase angle, magnetic resistance, and magnetic reactance is a certain value. for

[0064] S3B. When the optimization goal of magnetic impedance regulation is the direction of change of at least one of the change characteristics of magnetic impedance modulus, phase angle, magnetic resistance, and magnetic reactance, the positive and negative change amount of at least one of the magnetic impedance change characteristics of modulus, phase angle, magnetic resistance, and magnetic reactance can be obtained. The positive and negative change amount of the magnetic impedance change characteristic includes the change amount of the modulus. The positive and negative of the phase angle change θ-θ1, the positive and negative of the magnetic resistance change The positive and negative, magnetic reactance change The positive and negative of θ-θ1 and consistent.

[0065] S3C. When the optimization target is a known definite value of one changing feature and a changing direction of another changing feature, after the changing feature of the known changing direction is represented by the changing feature of the known definite value according to the functional relationship between the two changing features, the magnetic impedance change amount is calculated using the expression in S3A, that is, the optimization target is converted into an optimization target in which at least one changing feature is a definite value.

[0066] S4, initialize the parameters of the magnetic induction in the composite magnetic induction, according to the magnetic impedance change calculated in step S3 Or the positive and negative magnetic impedance change characteristics are obtained to obtain the equivalent electrical impedance of the composite magnetic induction

[0067] As shown in Figure 4, a composite magnetic inductor consists of a magnetic inductor and an electromagnetic element connected to it. This can be considered a circuit connected by a magnetic inductor and a magnetic circuit. The magnetic inductor can be a magnetic inductor element in the form of any multi-turn short-circuited coil. The number of turns, conductor material, and geometric structure of the magnetic inductor can be designed and selected according to specific needs. Electromagnetic elements include resistors, capacitors, inductors, operational amplifiers, controlled sources, transformers, switching devices, and any other fixed or adjustable circuit or magnetic circuit element. By connecting the magnetic inductor to a variable electromagnetic element and combining it with a sensor or feedback control system to automatically adjust the electromagnetic element value, the electrical impedance of the composite magnetic inductor can be automatically adjusted, thereby adjusting the magnetic circuit's magnetic impedance. Further adjustment of the magnetic circuit impedance can be achieved by varying the magnetic inductance parameters in the composite magnetic inductor, as well as the type and parameters of the electromagnetic element.

[0068] As shown in Figure 1, after the composite magnetic inductance is connected to the magnetic circuit, it can be regarded as connecting the magnetic inductance of the electromagnetic element to the magnetic circuit. Through the magnetic inductance with turns N2 and resistance R2, the magnetic impedance of the composite magnetic inductance is The resistance of the impedance Z2 is equivalent to the magnetic impedance. The positive and negative of the magnetic reactance are consistent, and the reactance of the electrical impedance Z2 is consistent with the magnetic impedance. The positive and negative magnetic resistances are consistent. The composite magnetic induction is calculated according to the magnetic impedance. The positive and negative magnetic resistance can be divided into positive magnetic resistance and negative magnetic resistance. The positive and negative values ​​of the magnetic reactance can be divided into positive magnetic reactance and negative magnetic reactance; according to the positive and negative values ​​of the resistance in the equivalent electrical impedance Z2, it can be divided into positive resistance and negative resistance; according to the positive and negative values ​​of the reactance in Z2, it can be divided into inductive and capacitive.

[0069] S41. Assign the magnetic impedance of the composite magnetic inductance to the magnetic impedance change calculated in step S3. The expression of the composite magnetic inductance composed of a magnetic inductance with a number of turns N2 and a resistance R2 and an electromagnetic element is equivalent to the electrical impedance Z2:

[0070] S42A. When S3 calculates the magnetic impedance change That is, the magnetic impedance change characteristics To determine the value, Calculate the electrical impedance of the composite magnetic induction according to the expression of Z2;

[0071] S42B. When S3 obtains the positive or negative sign of the magnetic impedance change characteristic, that is, the adjustment optimization target is the change direction of a certain characteristic of the magnetic impedance, after determining the positive or negative sign of the change in magnetic resistance and magnetic reactance, the positive or negative sign of the resistance and reactance in the electrical impedance Z2 of the composite magnetic inductance can be obtained according to the expression of Z2.

[0072] S5. According to the resistance and reactance in the electromagnetic element electrical impedance Z2-R2 in the composite magnetic inductance, the corresponding electromagnetic element is selected to form a composite magnetic inductance electrically connected to the magnetic inductance and the electromagnetic element.

[0073] The electrical impedance of the electromagnetic element in the composite magnetic inductor is

[0074] When the resistance of Z2-R2 is positive, the electromagnetic element in the composite magnetic inductor is a resistive element; when the resistance of Z2-R2 is negative, the electromagnetic element in the composite magnetic inductor is a negative resistance circuit. When the reactance of Z2-R2 is positive, the electromagnetic element in the composite magnetic inductor is an inductive element; when the reactance of Z2-R2 is negative, the electromagnetic element in the composite magnetic inductor is a capacitive element. The negative resistance circuit can be implemented using negative resistance devices and / or circuits such as a negative resistance amplifier, a switched capacitor circuit, a negative resistance inductor, a negative resistance capacitor diode, or a negative resistance resistor.

[0075] For the two optimization goals of magnetic impedance optimization value and magnetic impedance optimization direction, it is necessary to select electromagnetic components to form composite magnetic inductance in two cases, S5A and S5B:

[0076] S5A. When the magnetic impedance change is obtained by S3 That is, the change in magnetic impedance When determining the value, the electrical impedance of the electromagnetic component is Z2-R2, and the type and value of the electromagnetic component are determined based on this value;

[0077] S5B. When S3 obtains the positive or negative sign of the magnetic impedance change characteristic, that is, the adjustment optimization target is the change direction of a certain magnetic impedance characteristic, the type of component to be selected is determined based on the positive or negative sign of the resistance and reactance in Z2-R2, and the parameter value range of the selected type of electromagnetic component is obtained based on the optimization target of the magnetic impedance adjustment, and the electromagnetic component parameter value is taken within the value range.

[0078] When the goal of magnetic impedance regulation optimization is to reduce the modulus of magnetic impedance, S5B can obtain the following four parallel composite magnetic induction configuration schemes:

[0079] The goal of magnetic impedance regulation optimization is to reduce the modulus of magnetic impedance. The first composite magnetic inductance composition scheme is: according to the positive and negative of the resistance and reactance in Z2-R2, the composite magnetic inductance is determined as a magnetic inductance connected to a capacitor element, and the parameters of each element meet At this time, the total magnetic resistance of the magnetic circuit decreases, and the magnetic reactance increases, resulting in an increase in the phase angle.

[0080] When the composite magnetic induction is composed of magnetic induction and capacitance, the magnetic impedance The magnetic resistance is negative, the magnetic reactance is positive, and the direction of change of the total magnetic impedance of the magnetic circuit is uncertain. Assume that the magnetic resistance of the magnetic circuit before adjustment is Magnetic induction is The composite magnetic inductor is composed of a magnetic inductor with a number of turns N2 and a resistor R2 connected to an ideal capacitor with a capacitance of C. According to the vector magnetic circuit theory, the parameters of each component meet the following conditions: When , the total magnetic impedance of the magnetic circuit decreases; When , the magnetic impedance of the magnetic circuit remains unchanged; When , the magnetic impedance of the magnetic circuit increases.

[0081] When , the total magnetic impedance of the magnetic circuit decreases. Under this premise, in order to obtain a smaller magnetic impedance, assuming that the other parameters remain unchanged, each parameter is discussed separately:

[0082] A. hour, C is slightly smaller than The magnetic impedance is minimum;

[0083] B. hour, When the magnetic impedance is minimum;

[0084] C. hour, The smaller R2 is, the smaller the magnetic impedance is;

[0085] D. When the length of the magnetic induction coil is proportional to the number of turns, R2∝N2. Let R2=aN2. hour, The smaller N2 is, the smaller the magnetic impedance is.

[0086] The second composite magnetic inductance configuration scheme when the goal of magnetic impedance adjustment optimization is to reduce the modulus of magnetic impedance is: according to the positive and negative values ​​of resistance and reactance in Z2-R2, the composite magnetic inductance is determined as a negative resistance circuit with a magnetic inductance connection resistance value less than -R2. The magnetic resistance is 0 and the magnetic reactance is negative. At this time, the total magnetic resistance of the magnetic circuit remains unchanged, and the magnetic reactance decreases, resulting in a decrease in the phase angle; if Then the magnetic reactance in the total magnetic circuit impedance is negative, and the phase angle is negative.

[0087] The goal of magnetic impedance regulation optimization is to reduce the modulus of magnetic impedance. The third composite magnetic induction scheme is: according to the positive and negative signs of the resistance and reactance in Z2-R2, the composite magnetic induction is determined as the magnetic induction connection capacitor and the negative resistor with a resistance value less than -R2. At this time, the magnetic resistance decreases, the magnetic induction decreases, and the phase angle change direction is changed by The positive and negative decision.

[0088] The goal of magnetic impedance regulation optimization is to reduce the modulus of magnetic impedance. The fourth composite magnetic induction structure is: determine the composite magnetic induction according to the positive and negative of the resistance and reactance in Z2-R2. The magnetic resistance and / or reactance is negative and At this time, the direction of phase angle change is determined by The positive and negative decision.

[0089] When the optimization goal of magnetic impedance is to increase the modulus of magnetic impedance, S5B obtains the following two types of composite magnetic induction configuration schemes:

[0090] The composite magnetic inductance is made by the magnetic inductance electrical connection The electromagnetic components are composed of

[0091] The composite magnetic induction includes only the magnetic induction.

[0092] S6, judge whether the electromagnetic component parameters selected according to S5 are appropriate and determine the optimal composite magnetic induction

[0093] Consider whether the electromagnetic element with the corresponding value determined in S5 can be obtained, and judge whether the composite magnetic induction is suitable. If it can be obtained, determine that the magnetic induction and the selected electromagnetic element form the optimal composite magnetic induction and proceed to the next step; otherwise, return to S4 and adjust the parameters of the magnetic induction;

[0094] S7: Add the optimal composite magnetic induction determined in S6 to the magnetic circuit to adjust or optimize the magnetic circuit impedance.

[0095] The above is the specific process of the magnetic circuit impedance adjustment method based on composite magnetic induction.

[0096] FIG2 is a flow chart corresponding to the magnetic circuit impedance adjustment method based on composite magnetic induction. The magnetic circuit impedance adjustment method proposed in the present invention will be specifically described below through two examples based on the flow chart.

[0097] Example 1. The existing magnetic circuit is unloaded, the magnetic potential is 9.70A, the magnetic flux is 0.3771mWb, the angle between the two is 28.46°, the operating frequency is 50Hz, and it is required to reduce the magnetic impedance.

[0098] The adjustment process of magnetic circuit impedance is as follows:

[0099] First, calculate the magnetic impedance of the current magnetic circuit.

[0100] Next, the target magnetic impedance is calculated. This example doesn't specify a specific adjustment target; it simply aims to reduce the magnetic impedance. Since both a composite magnetic inductor structure with a magnetic inductor coupled to a capacitor or a negative resistance circuit can achieve this goal, and since capacitors are more common than negative resistance components, this example uses a composite magnetic inductor structure with a magnetic inductor coupled to a capacitor as an example to optimize the magnetic circuit impedance.

[0101] A wire with a resistance of 0.0135Ω for one turn of coil is selected. Since the smaller the number of turns, the greater the weakening effect of the composite magnetic induction on the magnetic impedance, the number of turns of magnetic induction N2 = 1 and the resistance R2 = 0.0135Ω are tentatively set.

[0102] We have ω=2πf=314.16, The magnetic impedance decreases when the capacitance is less than 223mF. The total magnetic impedance of the magnetic circuit decreases when the capacitance is slightly less than 111.5mF.

[0103] Select a 100mF capacitor and connect it to the magnetic inductor to form the electrical impedance of the composite magnetic inductor.

[0104] Equivalent magnetic impedance

[0105] at this time The weakening ratio is This composite magnetic induction significantly reduces the magnetic impedance of the magnetic circuit.

[0106] Example 2. The existing magnetic circuit is unloaded, the magnetic potential is 9.70A, the magnetic flux is 0.3771mWb, the angle between the two is 28.46°, the operating frequency is 50Hz, and it is required to increase the magnetic impedance of the magnetic circuit so that the magnetic flux is 0.350mWb under the same magnetic potential and the angle remains unchanged.

[0107] The adjustment process of magnetic circuit impedance is as follows:

[0108] First, calculate the magnetic impedance of the current magnetic circuit.

[0109] Next, the target magnetic impedance is calculated.

[0110] Then, the change in magnetic impedance is obtained

[0111] Select the magnetic inductance in Example 1, the number of turns N2 = 1, and the resistance R2 = 0.0135Ω. ω = 2πf = 314.16, and calculate the equivalent electrical impedance of the composite magnetic inductance as follows:

[0112] Again, the electrical impedance of the circuit connected to the magnetic inductor is 0.0616 + 0.1386j;

[0113] Finally, based on the positive and negative values ​​of the resistance and reactance in the electrical impedance, a 0.062Ω resistor and a 0.44mH inductor were selected. These two components are relatively common and do not require adjustment of the magnetic inductance parameters. The aforementioned circuit components are connected to the magnetic inductor to form a composite magnetic inductor. By adding this composite magnetic inductor to the magnetic circuit, the magnetic impedance can be adjusted.

[0114] The above two examples verify the feasibility of the magnetic circuit impedance adjustment method based on composite magnetic induction proposed in the present invention.

[0115] JMAG finite element software was used to simulate the composite magnetic induction, and composite magnetic induction was added to the magnetic core to verify the feasibility of changing the magnetic circuit impedance. Figure 4 is a simulation model diagram of the present invention, in which an excitation winding and an open-circuit detection coil for observing the magnetic flux are installed on the magnetic core. First, the magnetic impedance of the magnetic circuit at no load is obtained, and then different composite magnetic inductions are added to the magnetic circuit to observe the change in magnetic circuit impedance. Figure 5 shows the magnetic impedance and change before and after adding the composite magnetic induction of the magnetic induction connected to the capacitor to the magnetic circuit at 10 to 100 Hz. According to the simulation results, at 70 Hz and below, the magnetic circuit impedance decreases after adding the composite magnetic induction; as the frequency increases, the composite magnetic induction increases the magnetic circuit impedance. Both theoretical calculations and finite element simulations have verified the effectiveness and feasibility of this method.

[0116] In summary, the present invention proposes a method for adjusting magnetic circuit impedance based on composite magnetic induction. The foregoing description is merely a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the foregoing embodiment. Any equivalent modifications or variations made by those skilled in the art based on the disclosure of the present invention should be included within the scope of protection set forth in the claims.

Claims

1. A magnetic circuit magnetic impedance adjustment method based on composite magnetic induction, characterized in that: The composite magnetic inductor is composed of a magnetic inductor electrically connected to an electromagnetic element, and the magnetic impedance adjustment method of the magnetic circuit includes the following steps: Step S1, calculating the magnetic impedance before adjustment based on the vector magnetic circuit theory; Step S2, determining an optimization target for magnetic impedance adjustment and calculating a target magnetic impedance, wherein the optimization target for magnetic impedance adjustment includes: an optimization value of a magnetic impedance change characteristic and / or an optimization direction of a magnetic impedance change characteristic; Step S3, calculating the magnetic impedance change amount or obtaining the positive or negative sign of the magnetic impedance change characteristic according to the magnetic impedance before adjustment, the target magnetic impedance and the optimization target; Step S4, initializing the parameters of the magnetic inductance in the composite magnetic inductance, and obtaining the equivalent electrical impedance of the composite magnetic inductance according to the magnetic impedance change calculated in step S3 or the positive and negative of the magnetic impedance change characteristics obtained; Step S5, selecting the type of electromagnetic element and determining the parameters of the electromagnetic element according to the resistance and reactance in the electrical impedance of the electromagnetic element in the composite magnetic inductor, so as to form the composite magnetic inductor; Step S6, when the electromagnetic element determined in step S5 can be obtained, determine that the magnetic induction and the selected electromagnetic element form an optimal composite magnetic induction, and proceed to step S7; otherwise, return to step S4 and adjust the parameters of the magnetic induction in the composite magnetic induction; Step S7, adding the optimal composite magnetic induction determined in step S6 to the magnetic circuit.

2. The magnetic circuit magnetic impedance adjustment method based on composite magnetic induction according to claim 1 is characterized in that: The electromagnetic element is a fixed or adjustable physical element, and the fixed or adjustable physical element includes but is not limited to: a resistor, an inductor, a capacitor, a negative resistance circuit, a transformer, a controlled source, an operational amplifier, and a switching device.

3. The magnetic circuit magnetic impedance adjustment method based on composite magnetic induction according to claim 2 is characterized in that: The formula for calculating the magnetic impedance before adjustment in step S1 based on the vector magnetic circuit theory is: in, is the magnetic impedance before adjustment, θ1, In order to adjust the phase angle, magnetic resistance, magnetic reactance and magnetic induction of the front magnetic impedance, without considering the hysteresis effect and magnetic density saturation, This formula applies to sine.

4. The magnetic circuit magnetic impedance adjustment method based on composite magnetic induction according to claim 3 is characterized in that: In step S2, the optimization value of the magnetic impedance change characteristic includes but is not limited to: the determined value of at least one change characteristic of the magnetic impedance modulus, phase angle, magnetic resistance, and magnetic reactance, and the optimization direction of the magnetic impedance change characteristic includes but is not limited to: the change direction of at least one change characteristic of the magnetic impedance modulus, phase angle, magnetic resistance, and magnetic reactance.

5. The method for adjusting magnetic impedance of a magnetic circuit based on composite magnetic induction according to claim 4, characterized in that: The specific method of calculating the magnetic impedance change amount or obtaining the positive or negative sign of the magnetic impedance change characteristic in step S3 according to the magnetic impedance before adjustment, the target magnetic impedance and the optimization target is: Step S3A, when the optimization target of the magnetic impedance adjustment is the determined value of at least one change characteristic of the magnetic impedance modulus, phase angle, magnetic resistance, and magnetic reactance, the magnetic impedance change amount for is the target magnetic impedance, θ is the phase angle of the target magnetic impedance, θ2, The phase angle, magnetic resistance and magnetic reactance of the change in magnetic impedance; Step S3B, when the optimization target of the magnetic impedance adjustment is the change direction of at least one change characteristic of the magnetic impedance modulus, phase angle, magnetic resistance, and magnetic reactance, obtain the change amount of the modulus Phase angle change θ-θ1, magnetic resistance change Magnetic reactance change The sign of at least one of the changing characteristics is negative. is the magnetic resistance and reactance of the target magnetic impedance; Step S3C, when the optimization target of the magnetic impedance adjustment is the determined value of a change feature and the change direction of another change feature, according to the functional relationship between the two change features, the change feature of the known change direction is represented by the change feature of the known determined value, and the magnetic impedance change amount is calculated using the expression in step S3A.

6. The method for adjusting magnetic impedance of a magnetic circuit based on composite magnetic induction according to claim 5, characterized in that: The specific method of obtaining the equivalent electrical impedance of the composite magnetic inductance in step S4 according to the magnetic impedance change amount calculated in step S3 or the positive or negative value of the magnetic impedance change characteristic obtained is: Step S41, assigning the magnetic impedance of the composite magnetic inductor to the magnetic impedance variation calculated in step S3 Through the expression The magnetic impedance of the composite magnetic inductor composed of a magnetic inductor with a number of turns N2 and a resistance R2 and an electromagnetic element Equivalent to electrical impedance Z2; Step S42A, when the magnetic impedance change is calculated in step S3 When the equivalent electrical impedance of the composite magnetic induction is calculated according to the expression described in step S41, Step S42B, when S3 obtains the positive or negative of the magnetic impedance change characteristic, the positive or negative of the magnetic resistance change amount and the positive or negative of the magnetic reactance change amount are determined according to the positive or negative of the magnetic impedance change characteristic, and the positive or negative of the resistance in the expression described in step S41 is set to the positive or negative of the magnetic reactance change amount, and the positive or negative of the reactance in the expression described in step S41 is set to the positive or negative of the magnetic resistance change amount.

7. The method for adjusting magnetic impedance of a magnetic circuit based on composite magnetic induction according to claim 6, characterized in that: The specific method of step S5 is: Step S5A, when the magnetic impedance change is calculated in step S3 When the type and value of the electromagnetic element in the composite magnetic inductance are selected according to the resistance and reactance of the electromagnetic element impedance Z2-R2 in the composite magnetic inductance; Step S5B, when the positive and negative signs of the magnetic impedance change characteristics are obtained in step S3, the type of electromagnetic element in the composite magnetic inductance is selected according to the positive and negative signs of the resistance and reactance of the electrical impedance Z2-R2 of the electromagnetic element in the composite magnetic inductance, the parameter value range of the selected type of electromagnetic element is determined according to the optimization target of the magnetic impedance adjustment, and the parameter value of the selected type of electromagnetic element is selected within the parameter selection range.

8. The method for adjusting magnetic impedance of a magnetic circuit based on composite magnetic induction according to claim 7, characterized in that: The specific method for selecting the type of electromagnetic element in the composite magnetic inductor according to the positive and negative values ​​of the resistance and reactance of the electromagnetic element impedance Z2-R2 in the composite magnetic inductor is: When the resistance of the electromagnetic element electrical impedance Z2-R2 in the composite magnetic inductance is positive, the electromagnetic element in the composite magnetic inductance is a resistive element; When the resistance of the electromagnetic element electrical impedance Z2-R2 in the composite magnetic induction is negative, the electromagnetic element in the composite magnetic induction uses a negative resistance circuit; When the reactance of the electromagnetic element electrical impedance Z2-R2 in the composite magnetic inductance is positive, the electromagnetic element in the composite magnetic inductance is selected as an inductive element; When the reactance of the electrical impedance Z2-R2 of the electromagnetic element in the composite magnetic inductance is negative, the electromagnetic element in the composite magnetic inductance is a capacitive element.

9. The method for adjusting magnetic impedance of a magnetic circuit based on composite magnetic induction according to claim 8, characterized in that: When the goal of the magnetic impedance adjustment optimization is to reduce the modulus of the magnetic impedance, the step S5B determines the following four types of composite magnetic inductance configuration schemes according to the resistance and reactance of the electromagnetic element impedance Z2-R2 in the composite magnetic inductance: The composite magnetic inductor is composed of a magnetic inductor electrically connected to a capacitor element, and the magnetic inductor parameters and the capacitor element parameters satisfy The composite magnetic inductor is composed of a magnetic inductor electrically connected to a negative resistance circuit having a resistance value less than -R2; The composite magnetic inductor is composed of a magnetic inductor electrically connected to a capacitor and a negative resistor with a resistance value less than -R2; The composite magnetic inductance is made by connecting the magnetic inductance The magnetic resistance and / or reactance is negative and of Electromagnetic components.

10. The method for adjusting magnetic impedance of a magnetic circuit based on composite magnetic induction according to claim 8, characterized in that: When the goal of the magnetic impedance adjustment optimization is to increase the modulus of the magnetic impedance, the step S5B determines the following two types of composite magnetic inductance configuration schemes according to the resistance and reactance of the electromagnetic element impedance Z2-R2 in the composite magnetic inductance: The composite magnetic inductance is made by connecting the magnetic inductance The electromagnetic components are composed of The composite magnetic induction includes only the magnetic induction.

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