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Transient Magnetic Analysis

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Transient Magnetic, is the study of magnetic fields due to time varying currents, typically caused by surges in currents.Similar to Magnetostatic and AC Magnetic, Maxwell's displacement current that couples the electric and magnetic fields is assumed to be null.


In the Transient Magnetic analysis, the Gauss's law for magnetism, i.e. divergence of magnetic flux density is null, and Faraday's law,, i.e. the induced electromotive force (emf) in any closed circuit is equal to the time rate of change of the magnetic flux through the circuit, are invoked to compute the magnetic field and its related quantities due to permanent magnets and time varying electric currents and voltages.It has many practical applications,including:

  • Switch on/off modes and failures in power electronic devices
  • Saturation in steel cores
  • NDT and NDE
  • Inductive heating and hardening
  • Induction machines
  • Levitators
  • Motors and generators
  • Actuators
  • Loud speakers
  • Alternators


The Transient Magnetic module outputs the following results for each study at each time step:

  • Magnetic field
  • Magnetic flux density
  • Current density
  • Eddy current
  • Force density
  • Inductance matrix
  • Flux linkage
  • Impedance
  • Ohmic loss
  • Current
  • Voltage
  • Force
  • Torque
  • Stored energy
  • Temperature
  • Temperature gradient
  • Heat flux

Examples of design issues

The Transient Magnetic module can help study a large number of devices and address numerous magnetic,eddy current, and transient effects.Below is just a partial list:

  • Take into account both eddy current and saturation in devices that use time varying magnetic fields such as loudspeakers and induction machines.
  • Optimize the Non-Destructive Testing (NDT) and Non-Destructive Evaluation (NDE) sensors to detect deep flaws and cracks.
  • Study time varying devices such as magnetic heads, pulsed power transformers, and electromagnetic launchers.
  • Study the response of pulsed power electronic equipment after a power failure or switch off.
  • Design inductive heating devices.
  • Calculate the motion of loudspeaker voice coils.
  • Study the switch on/off modes, failures, AC excitation of devices with non-linear magnetic materials.
  • Calculate the motion of electromechanical devices such as motors, generators, actuators, magnetic levitation, etc.