AC Magnetic Analysis for Eddy Currents and Core Losses
AC magnetic analysis in EMWORKS solves time-harmonic magnetic fields from AC currents in 2D and 3D geometries, including eddy currents in conductors and losses in magnetic cores.
Fields and flux from coils, windings, and busbars under AC excitation
Eddy currents and I²R / core losses in conductors and ferromagnetic parts
Inductance, impedance, and leakage parameters for transformers and inductors
Basis for force, torque, and loss calculations in motors, actuators, and other AC devices
Key Features of EMWORKS AC Magnetic Analysis
1
Time-harmonic magnetic fields: Solves sinusoidal (AC) magnetic fields from coils, windings, and busbars in 2D and 3D.
2
Eddy currents and losses: Computes eddy currents in solid and laminated conductors and core regions, with I²R and core loss evaluation.
3
Nonlinear magnetic materials: Supports B–H curves and saturation in ferromagnetic cores under AC excitation.
4
Inductance and impedance: Extracts self and mutual inductances, impedance, leakage reactance, and equivalent circuit parameters for coils, transformers, and inductors.
5
Coupling between components: Evaluates magnetic coupling and mutual inductance between phases, windings, and inductive sensors.
6
Force and torque under AC excitation: Calculates magnetic forces and torque on movers, armatures, and rotors in AC-driven devices.
7
Data for multiphysics: Exports loss distributions (J·E, core losses) as inputs for thermal or structural analyses.
Applications and Devices for AC Magnetic Analysis
Transformers and inductors – AC flux distribution, leakage, magnetizing current, copper and core losses.
Motors and generators – torque, losses, flux harmonics, skin and proximity effects in windings and rotors.
Litz Wires and Loss – minize losses in Litz wires.
Busbars, conductors, and laminations – eddy currents, I²R losses, skin depth, proximity effects.
Induction heating – power density and temperature input for industrial and domestic induction systems.
Wireless power transfer and charging – coupling coefficients, efficiency, stray field levels.
Magnetic brakes, clutches, and dampers – torque vs slip or frequency, loss torque estimation.
Magnetic bearings and levitation – lift force, stiffness, and power loss in rotor and stator parts.
Results of EMWORKS' AC Magnetic Analysis
For each study (per frequency), the AC Magnetic module can report:
- Magnetic field H
- Magnetic flux density B
- Current density J
- Eddy current distribution
- Force density
- Inductance matrix
- Flux linkage
- Resistance
- Impedance
Losses:
- Core loss
- Eddy current loss
- Hysteresis loss
- Ohmic (I²R) loss
Global quantities:
- Current
- Voltage
- Force
- Torque
- Stored magnetic energy
In coupled magneto-thermal analysis:
- Temperature
- Temperature gradient
- Heat flux
