Transient 3D with Motion solver
This solver includes coupling to the mechanical equations of motion, so that the movement of a component of a device (e.g. the rotor in an electrical machine or the plunger in an actuator) is accurately simulated. The mechanical effects include viscous friction, inertia, mass, springs, and gravitation, as well as constraints on movement imposed by mechanical end stops, and arbitrary load forces specified as a function of position, speed, and time. With the Transient 3D with Motion solver, the field equations are solved in 3-dimensions and therefore take into account devices without translational or axial symmetry, such as end effects and skew in motor applications.
The Transient 3D with Motion solver re-meshes only the region surrounding the moving component. Re-meshing this relatively small and simple region is quick, and with this approach, no additional constraint equations need to be solved, which keeps solution times short and memory requirements low.
The electric circuit elements which are available in the Time-harmonic and Transient solvers are also available with the Transient 3D with Motion. This means that the device can be current or voltage driven and the circuit may include resistors, capacitors, and inductors in series. Thus a switch on transient in an electrical machine may be simulated for any point in the ac cycle and the resulting run-up curve for the device determined. Alternately, the speed of a motor can be fixed and the effects on the torque and excitation systems found. As with all MagNet components, a device in Transient 3D with Motion can be fully parameterized and its operation scripted through a Visual Basic interface - thus complete design exploration and optimization can be implemented.
Typical applications for the Transient 3D with Motion solver includes electrical machines (claw-pole, induction motors, switched reluctance, brushed and brushless DC), actuators, levitation systems, braking systems, magnetic bearings, loudspeakers, and electromechanical shakers.
More details on the 3D Transient with Motion solver
- The solver uses the advanced T-Omega formulation developed by Infolytica with hierarchal elements based on polynomial orders 1 to 3.
- The transient solver uses a high-order time-stepping scheme. Mechanical effects, such as the torque acting on a rotor, and the friction and windage losses, are taken into account during each time step and used to compute the new positions and speeds of moving parts.
- The full effects of induced currents are included. Therefore, in applications where the moving component runs at a high speed, the eddy currents that are induced in solid conductors are taken into account.
- Coils may be connected in circuits supplied by current or voltage sources of arbitrary waveform.
- A switch-on transient in an electrical machine may be simulated for any point in the AC cycle and the resulting run-up curve for the device determined. Alternately, the speed of a motor can be fixed and the effects on the torque and excitation systems found.