Whenever possible, use PLANE233 (the current-technology electromagnetic element) rather than PLANE13 (a legacy magnetic element).
PLANE233 supports the magnetic (KEYOPT(1) = 0), electromagnetic (KEYOPT(1) = 1), and stranded coil (KEYOPT(1) = 2) analysis options. For these analyses, the current technology element has more advanced features than PLANE13. The following capabilities are available only with the PLANE233 element type:
Thickness (plane geometry) or ° slice (axisymmetric geometry) input
Nodal Maxwell and Lorentz forces
Displacement current effect in a harmonic electromagnetic analysis
Coupling to circuit elements through the electric potential (VOLT) degree of freedom
Stranded coil formulation (see 2D Stranded Coil Analysis)
Linear perturbation analysis.
PLANE233 does not support nonlinear harmonic analysis.
Some of the procedural steps in Steps in a Static Magnetic Analysis of this chapter and in the respective sections of 2D Harmonic Magnetic (AC) Analysis and 2D Transient Magnetic Analysis are not applicable to PLANE233. Before setting up your analysis, consider the following differences between PLANE233 and PLANE13:
PLANE233 always behaves as a stranded conductor (no eddy current effects are modeled) in a harmonic or transient analysis when the element does not have the VOLT degree of freedom (KEYOPT(1) = 0).
By default, the meaning of VOLT degree of freedom with PLANE233 is electric potential. To do an electromagnetic analysis with time-integrated electric potential as a VOLT degree of freedom, use KEYOPT(2) = 2 with PLANE233.
With PLANE233, you do not need to apply any force flags to calculate magnetic forces. Depending on the KEYOPT(8) setting, Maxwell (KEYOPT(8) = 0) or Lorentz (KEYOPT(8) = 1) forces will be calculated and output as FMAG either at each element node (KEYOPT(7) = 0) or condensed to the corner nodes (KEYOPT(7) = 1). Lorentz forces are calculated for current carrying elements only. To summarize magnetic forces and torques, use the EMFT command.
When summarizing Maxwell forces, select all the nodes in the region of interest and select all the elements attached to these nodes prior to issuing EMFT. For regions with corners, use KEYOPT(7) = 1 to obtain more accurate Maxwell forces.
When summarizing Lorentz forces, select all the nodes in the conductor and issue EMFT.
When performing an electromagnetic analysis of a moving conductor using PLANE233, specify the translational or angular velocity via the BF,,VELO command. The angular velocity units are radians/sec.
The following examples of a 2D magnetic analysis using the current technology element are available: