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Questions tagged [mutual-inductance]

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Mutual inductance

I am confused about derivation of the next formula The question is about Cm term. We have coupled inductors. The voltage across first coil is And I am ok with it. I understand it. I know ...
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25 views

Resultant voltage function through two opposing coils with mutual inductance

So my question is about the type of relationship in a particular circuit. I would like to know if it is linear or something else like a power. The circuit in question is a pair of adjacent, mutually ...
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Individual Three Phase Potential Transformers vs Three Potential Transformers in one case

If I had to select between Individual Three Phase Potential Transformers vs Three Potential Transformers in one case for a 600V system (which doesn't require many inches of spacing between phases to ...
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44 views

mutual inductance of BLDC motor

I want to use BLDC motor for charging the E-rickshaw for that I need to find the parameters of the motor. I have measured the Resistance and self-inductance of the motor but I am facing difficulties ...
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51 views

transformer voltage analysis

I'm trying to figure out the voltage and current (and subsequently power) of the resistor R2 in this circuit: simulate this circuit – Schematic created using CircuitLab The circuit is in ...
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25 views

How to achive mutual inductance and CM choke simulation in CircuitLab?

This site is using CircuitLab. In some SPICE programs it is possible to simulate CM choke. For example: Mutual Inductance is designated in a SPICE netlist by beginning the first word (label) of a ...
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1answer
70 views

Inductance of planar (spiral) coil near solid copper surface

I'm working on a electromagnetic levitation system, consisting of a flat spiral (planar) inductor positioned above a solid copper surface. The planar coil is parallel to the copper surface. (Consider ...
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2answers
373 views

Mutual inductance vs coupling coefficient

Question regarding this and this question about mutual inductance and coupling coefficient. I'm trying to analyse a two coil system: It consists of two coils like in the picture with 2 cm air gap ...
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0answers
169 views

Dot convention inductors in series: equation confusion

So I'm really confused with mutual inductors and dot convention. If your answer is going to be a link to any website I can assure you I read them all and that only left me more confused. So here are ...
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Deriving currents of parallel mutual inductors

This is possibly just a math question, not sure. In Irwin's textbook "Basic Engineering Circuit Analysis," 7e, there's a quick derivation for current in parallel inductors I don't follow: The KVL ...
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1answer
162 views

Simulating a variable mutual inductance model

Can we simulate a time varying mutual inductance in Matlab Simulink (or any other simulation tool). Matlab Simulink has a variable inductor, but I could not find not mutual inductor.
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Can I use rectified AC current to heat an object inside a induction coil?

The reason why I would like to use rectified AC is because I want to keep the magnetic field inside the coil unidirectional. A changing magnetic field induces current in the coil and vice versa. ...
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2answers
117 views

In an ideal transformer circuit, how is power transferred?

If I have a system of circuits like this: where Circuit 2 is providing power the Circuit 1, where does the energy come from? Do the inductors store energy? If not, how is power transferred from the ...
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1answer
84 views

How can I build my own wireless charger for my cellphone? [duplicate]

I am designing a wireless charger for my cellphone, Where my Primary coil is energised with 1.5V and 0.3A, Where I have used a transistor to turn it on and off at a frequency of 1Mhz. In the secondary ...
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2answers
1k views

A problem of ideal transformer

I am studying Fundamental of Electric Circuits by Alexander and Sadiku, and I am not able to solve a practice problem 13.9 about ideal transformer in Chapter 13 of the textbook. My answer is different ...
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1answer
213 views

Impedance matrix of a transmission line

I'm studying power systems and this question came up: if there are two transmission lines in series and I know the impedance matrix of each one (Zp is self-impedance and Zm is mutual impedance): ...
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Calculating Mutual Inductance in Parallel Wires

How would I calculate the mutual inductance (Lm) between parallel wires if I know the inductance per length of the wires and the separation between the wires?
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790 views

What happens when primary and secondary coil of an isolating(1:1) transformer are connected together(in parallel)?

I am considering the case of an isolating transformer because both the coils are identical. If we connect both of these in parallel, they will act as mutually linked inductors if they are connected in ...
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227 views

How to calculate the total impedance of a wire, considering a constant stray inductance acting on it

Consider two parallel wires A and B of equal lengths, carrying in-phase AC’s. Assume that, the frequency is so low relative to the distance R between them, that the phase delay is ignorable and that ...
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1answer
79 views

Mutual Inductance Between Two Same Axial Inductors

I was searching for few hours on this topic but I was unable to find any formula/research so I'm asking here. Please if this question is a duplicate let me know. Right now I do not have the equipment ...
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2answers
141 views

Coupling cofficient of coil in Resonant Series RLC Circuit

In the above diagram the circuit is in Series Resonance. Now we are asked to find the coupling coefficient K between coils L1 and L2. For which i first calculated L(equivalent) as follows : ...
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1answer
308 views

How to calculate the induced voltage of two electrically isolated coils (solenoids)?

Suppose I have the following setup: suppose then that: Self inductances L1,L2, the radius R, the number of windings (turns) N1, N2 are all given. V1 is given. The distance between the coils (...
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1answer
86 views

How to avoid mutual inductance at UHF frequencies?

I know that keeping inductors at right angles helps to avoid mutual inductance. But I can't find any information minimal spacing between inductors such that they have no mutual inductance. In my ...
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148 views

Finding equivalent impedance with ideal transformer

I'm working on finding the equivalent impedance of an ideal transformer. I want to derive the formula they are using in the book and lecture. Unfortunately when I try and get this equation by hand ...
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1answer
261 views

Total Inductance in transformer

Just a simple question, usually we can determine the sign of the mutual inductance M by seeing the position of the dots (as the current enters through it). But if you see the upper picture, we don't ...
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1answer
954 views

Equivalent Circuit for the RLC circuit to find the transfer function

I have a series RLC circuit with mutual inductance between the transmitter end and the receiver end. The circuit is I am trying to formulate a simple transfer function. I can formulate the ...
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1answer
495 views

Mutual inductance with open circuit, what's the voltage of the open circuit?

I'm currently struggling to solve this problem (problem below), I need to find U2(t) but I don't know how. I've only solved problems of this kind with closed circuit. Since the secondary loop is open ...
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1answer
416 views

Circuit feedback with mutual inductance on a toroid

I have been reviewing a circuit for the past few days and I am hoping to get some feedback to verify my thoughts as to how the circuit is working. This is a driving circuit for an ultrasonic cleaner ...
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2answers
1k views

If I used the primary coil as an inductor, does the secondary coil affect it?

I've read this question. It's about how to obtain the maximum inductance from a transformer: How do I use a transformer as an inductor? Now, I would like to use the primary coil only as an inductor ...
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0answers
104 views

Closed loop shapes with zero mutual inductance?

I have done numerous searches trying to find any mention of theory or experimentation done on determining closed current loop shapes that have zero mutual inductance and...no dice! Of course you can ...
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0answers
131 views

Calculate induced voltage in a wire due to mains wiring

I wish to calculate voltage induced in a short piece of wire of known length, due to mains household wiring carrying some current say 5 amps. My application is biomedical sensor wire and I can not use ...
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1answer
2k views

Induced voltages and flux within a transformer and their polarities

This is a multifaceted question, and is more to see if I understand what happens inside a transformer. I understand the general idea behind transformers: Alternating voltage that is applied to the ...
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1answer
549 views

Why is inductance negative in this triphase mutual inductor?

Suppose I have a threephase circuit with a mutual inductor on the first and second phase (V2 and V3). One way of solving the circuit (ie finding the phase currents) would be the following: convert the ...
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3answers
313 views

Does mutual inductance change individual inductances?

If I have two inductors, with inductances \$L_1\$ and \$L_2\$. I put them really close to each other to make a transformer. Are their individual inductances still \$L_1\$ and \$L_2\$? Or has the ...
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2answers
256 views

Dynamics of ideal transformers

Suppose I have the following ideal transformer circuit: According to the textbook that I was reading (Fundamentals of. Electric Circuits by Charles K. Alexander), V1/V2 = 1/n and I1/I2 = n. Does it ...
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1answer
90 views

Sensing inductance change in high power (20 watts) wireless transmitter

First post here. I have a built a wireless power transmitter that consists of 2 flat spiral coils that transmit about 20 watts across a short distant to power a heating element. The coils inductance ...
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1answer
1k views

Trying to make a wireless charging circuit with an AC source

i'm making a project on wireless charging and according to my understanding if i attach a ac source with a coil and attach a voltmeter to an other coil i should get voltage on the voltmeter provided ...
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1answer
408 views

Mutual Inductance - Self Induced Voltage

When constructing mesh equations for each loop where two coils are linked, I know how to determine the polarity of the induced voltage by use of dot markings, but I need some clarification on the self ...
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1answer
255 views

What's the minimum electrical requirements to ac-ac conversion

I bought a 220VAC -> 12VAC (0.3A 3.6VA) cheap power source, and tried to do a simple conversion of the output voltage, with two coils, around a ferrite core, with different length of turns. simulate ...
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1answer
7k views

Dot convention in Magnetically coupled circuits

The book says that the for loop 2, the KVL is \$-j3 I_{1} + (12+j6)I_{2}=0\$ , but the loop 2 leaves the dot in its coil. Isn't it supposed to be \$-j3I_{1} + (12-j6)I_{2} =0\$ ?
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511 views

Is it possible to design cascaded LC filters with inductors sharing the same core?

I want to design an higher order LC filter for filtering out a power signal. In the theoretical design, the inductors are supposed to be on separate cores. But in practice, it will be very costly and ...