Inductor Core Loss Calculator

Core Loss Equation:

\[ \text{Core Loss} = K_h f B^m + K_e f² B² \]

Hysteresis Constant (K_h):

Frequency (f):

Flux Density (B):

Exponent (m):

Eddy Constant (K_e):

Core Loss:

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1. What is Core Loss?

Core loss refers to the energy dissipated in the magnetic core of an inductor or transformer when subjected to alternating magnetic fields. It consists of hysteresis loss and eddy current loss components.

2. How Does the Calculator Work?

The calculator uses the core loss equation:

\[ \text{Core Loss} = K_h f B^m + K_e f² B² \]

Where:

\( K_h \) — Hysteresis constant (material-dependent)
\( f \) — Frequency (Hz)
\( B \) — Flux density (Tesla)
\( m \) — Steinmetz exponent (typically 1.6-2.5)
\( K_e \) — Eddy current constant (material-dependent)

Explanation: The first term represents hysteresis loss (proportional to frequency), while the second term represents eddy current loss (proportional to frequency squared).

3. Importance of Core Loss Calculation

Details: Accurate core loss calculation is essential for designing efficient magnetic components, predicting temperature rise, and optimizing power conversion systems.

4. Using the Calculator

Tips: Enter all parameters in appropriate units. Typical values for K_h and K_e can be found in core material datasheets. The exponent m is usually provided by the manufacturer.

5. Frequently Asked Questions (FAQ)

Q1: What are typical values for K_h and K_e?
A: These vary by material. For example, ferrite cores might have K_h ≈ 4×10^-5 and K_e ≈ 4×10^-10.

Q2: How does temperature affect core loss?
A: Core loss typically increases with temperature, though some materials may show different behavior near their Curie temperature.

Q3: What's the difference between hysteresis and eddy current loss?
A: Hysteresis loss comes from magnetic domain realignment, while eddy current loss comes from circulating currents in the core material.

Q4: Can this equation be used for all core materials?
A: It works well for most soft magnetic materials, but some materials may require more complex models.

Q5: How can core loss be reduced?
A: Using materials with lower K_h and K_e, reducing flux density, using thinner laminations, or employing powdered cores.