Transient Magnetic Analysis for Time-Domain Fields and Forces
Transient magnetic analysis in EMWORKS solves time-dependent magnetic fields from switching currents, motion, and nonlinear materials. It captures the evolution of flux, eddy currents, forces, and losses in CAD-based geometries.
Time-domain fields from coils, windings, and busbars under arbitrary waveforms
Motion of movers, rotors, armatures, plungers, and magnets
Eddy currents and transient I²R/core losses
Basis for force, torque, and coupled electro-thermal / motion studies
Key Features of EMWORKS' Transient Magnetic Analysis
1
Time-domain magnetic fields: Solves transient magnetic fields for arbitrary current/voltage waveforms (step, PWM, surge, fault, etc.).
2
Motion and moving parts: Supports motion of rotors, movers, armatures, plungers, and magnets with time-varying position.
3
Nonlinear magnetic materials: Handles B–H curves and saturation in cores, yokes, and other ferromagnetic parts under transient excitation.
4
Eddy currents and losses: Computes transient eddy currents and associated I²R/core losses in solid and laminated conductors.
5
Coupling with circuits: Links coils/windings to external circuits for realistic drive conditions and switching transients.
6
Forces and torque vs time/position: Calculates magnetic force and torque waveforms for actuators, relays, contactors, and electric machines.
7
Data for multiphysics: Exports time-dependent loss distributions as heat sources for thermal and electro-mechanical studies.
Applications and Devices for Transient Magnetic Analysis
Electric motors and generators – start-up, commutation, torque ripple, cogging torque, transient forces.
Actuators, relays, contactors, solenoids – force vs time/position under step, PWM, or fault currents.
Transformers and inductors – inrush current, core saturation, transient flux and losses.
Power electronics – converters, inverters, choppers: switching transients, current ripple, stray inductance effects.
Wireless charging and pulsed inductive systems – transient coupling, power transfer, and loss waveforms.
Magnetic brakes, clutches, and dampers – time-dependent torque and heating during engagement.
Magnetic bearings and levitation – dynamic stiffness, stability, and transient response to disturbances.
Electromagnetic launchers and railguns – force, current, and flux evolution during pulse events.
Results of EMWORKS' Transient Magnetic Analysis
For each study (per time step), the Transient Magnetic module can report:
- Magnetic field H
- Magnetic flux density B
- Current density J
- Eddy current distribution
- Force density
- Inductance matrix
- Flux linkage
- Impedance
- Ohmic loss (I²R)
- Current
- Voltage
- Force
- Torque
- Stored magnetic energy
In coupled magneto-thermal analysis:
- Temperature
- Temperature gradient
- Heat flux