Electromagnetic Circuit

How to do an electromagnetic Circuit?

Step 1 -Develop the reluctance network(magnetic equivalent circuit)

1. Length measured along flux line (ignore fringing and leakages)

2. Cross section considered perpendicular to flux lines

3. Stack length(stack height or thickness)mostly remains same if not specified

4. Identify the cross section areas in different sections of the electro magnetic component (machine , inductor,etc.)

5. find out length of each cross section area

6. Develop reluctance network similar to electrical resistance network by considering the series parallel connections

Step 2 - Determine the MMF of the circuit

1. If excitation than NI - single or multiple

2. Arrange according to polarity (for multiple direction is essential)

3. If PM than H*I

Step 3 - Determine flux - MMR/Rtotal

Step 4 - Calculate total flux linkage of the coil - N* phi

Step 5 - Calculate flux density through different cross sections - phi/Ai

Notes- Reluctance is represented as resistor symbol

Inductor Design problem