modeling a moving 3D magnet!

Hi everyone,

I am modeling a 3D magnet and a solenoid. The magnet is moving at a speed (constant or not), and it is moving towards to the solenoid, which is static (fixed to the ground). I want to model the emf and induced current on the solenoid, due to the change of magnetic flux density coming from the magnet.

So far, I have written ANSYS program, but keep getting warning like “Real constant set 1 undefined but referenced by element 1..”, I have searched as many ways as I can to fix this error, but couldn’t solved the problem at all.

Can anybody give me some suggestion please? Thanks so much!!!!

!**************************************************************

/TITLE,3D single magnet static analysis

/PREP7

EMUNITS,MKS

!************* DIMENSIONS ******************

pi = 3.1415

mx = 0.01

my = 0.01

mz = 0.01 ! dimensions of magnet

cr1 = 0.02

cr2 = 0.019

ch = 0.02 ! dimensions of coil

d = 0.01 ! distance between coil and magnet

l = 0.02 ! air gap

ax = cr2+l

ay = cr2+l

az = 2*mz+d+ch+l ! dimensions of air

care =0.0005*0.0005 ! cross section of coil

n =50 ! turns of coil

cv = pi*(cr2-cr1)*ch ! volume of coil

rcoil = 0.1 ! resistance of coil

d_dmn=0.025 ! depth of surrounding domain

R = 100 ! resistor connected to coil

frqncy=100

xveloc=0

yveloc=0

zveloc=-0.5 ! velocity

!************ GEOMETRIES *****************

vsel,none

block,-mx,mx,-my,my,-mz,mz ! magnet volume

vatt,1,,1 ! assign magnet with mat#1 and typ#1

vsel,none

cylind,cr1,cr2,mz+d,mz+d+ch ! coil

vatt,2,,2 ! assign magnet with mat#2 and typ#2

allsel

cm,magcoi_v,volu

vsel,none

block,-ax,ax,-ay,ay,-az,az

cm,space_v,volu

cmse,all

vsbv,space_v,magcoi_v,,dele,keep ! air volume (space minus magcoi)

cmse,u,magcoi_v

vatt,3,,3 ! assign air with mat#3 and typ#3

alls

vplo

!************* ELEMENTS & MATERIALS *******************

et,1,solid97 ! air (ele #1)

keyopt,1,1,0 ! AZ dof

keyopt,1,2,0 ! no velocity effects

mp,murx,1,1 ! air (mat #1)

et,2,solid97 ! magnet (ele #2)

keyopt,1,1,1 ! AZ dof, volt dof

keyopt,1,2,1 ! velocity effects

mp,murx,2,1.09 ! magnet (mat #2)

mp,MGzz,2,8*1e5

r,2,,,,,,,

rmore,,,xveloc,yveloc,zveloc

et,3,solid97 ! coil (ele #3)

keyopt,2,1,3 ! AZ dof, curr dof, emf dof

keyopt,2,2,0 ! no velocity effects

mp,murx,3,1 ! coil (mat #2)

mp,rsvx,3,8E-9

r,3,care,n,cv,0,0,0

rmore,,0.95

!************ MESH *****************

allsel

smrtsize,10

mshkey,0

mshape,1,3d

vmesh,all

!************ BOUNDARY CONDITIONS *****************

nsel,s,ext ! flux parallel exterior

d,all,az,0

!*********** Solution ************************

/solu

antype,trans

outres,all,all,

time,1

autots,1

deltim,0.01,0.01,0.04

cnvtol,volt

solve

fini