Release 11.0 Documentation for ANSYS
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This example presents a 2-D model of a coil actuator that demonstrates the use of surface-to-surface contact. Contact is typically used when multiple runs are required with re-positioning of a pole piece in a static or transient analysis, or for convenience in meshing regions with non-connecting meshes.
The contact region is located at the mid-span of the air gap. Two independent meshes are created; one for the lower portion of the model consisting of the back iron, coil, and lower air, and the upper portion consisting of the pole and the upper air. Target elements (TARGE169) are created using the ESURF command on the upper air elements at the air gap (coarser mesh). Contact elements (CONTA172) are created using the ESURF command on the lower air elements at the air gap (finer mesh). The MPC option is selected using bonded contact.
Figure 2.9 Element Plot Showing Independent Meshes
/batch,list /prep7 /title, Actuator model using surface to surface contact et,1,53 ! plane53 et,2,169 ! Target et,3,172,7,2,,2 ! Contact, MPC option keyopt,3,12,5 ! Bonded contact mp,murx,1,1 tb,bh,2,,40 ! BH curve tbpt,,355,.7 ,,405,.8 ,,470,.9 ,,555,1. ,,673,1.1 ,,836,1.2 ,,1065,1.3 ,,1220,1.35 ,,1420,1.4 ,,1720,1.45 ,,2130,1.5 ,,2670,1.55 ,,3480,1.6 ,,4500,1.65 ,,5950,1.70 ,,7650,1.75 ,,10100,1.8 ,,13000,1.85 ,,15900,1.9 ,,21100,1.95 ,,26300,2. ,,32900,2.05 ,,42700,2.1 ,,61700,2.15 ,,84300,2.2 ,,110000,2.25 ,,135000,2.3 ,,200000,2.41 ,,400000,2.69 ,,800000,3.22 mp,murx,3,1 ! coil ! create backiron rectng,0,.06,0,.01 rectng,0,.01,.01,.02 rectng,.05,.06,.01,.02 ! create coil rectng,.02,.04,-.005,0 rectng,.02,.04,.01,.015 aglue,all ! create lower air domain rectng,-.02,.08,-.01,.021 aovlap,all numcmp,area cm,lower,area ! create pole rectng,0,.06,.022,.032 ! create upper air rectng,-.02,.08,.021,.04 aovlap,7,8 asel,s,area,,7,9 cm,upper,area asel,s,area,,4,6 aatt,2,1,1 ! backiron asel,s,area,,7 aatt,2,1,1 ! pole asel,s,area,,2,3 aatt,3,1,1 ! coil cmsel,s,lower esize,.002 amesh,all cmsel,s,upper esize,.003 amesh,all esla,s nsle,s nsel,r,loc,y,.021 type,2 esurf ! mesh target elements cmsel,s,lower esla,s nsle,s nsel,r,loc,y,.021 type,3 esurf ! mesh contact elements allsel,all nsel,s,loc,x,-.02 nsel,a,loc,x,.08 nsel,a,loc,y,-.01 nsel,a,loc,y,.04 d,all,az,0 ! flux parallel asel,s,area,,3 esla,s bfe,all,js,,,,5e6 ! coil current density asel,s,area,,2 esla,s bfe,all,js,,,,-5e6 allsel,all finish /solu magsolv finish
Figure 2.10 Flux Line Plot
Figure 2.11 Flux Density Plot
