{"id":54322,"date":"2021-04-16T07:33:33","date_gmt":"2021-04-16T07:33:33","guid":{"rendered":"\/forum\/forums\/topic\/error-there-is-at-least-1-small-equation-solver-pivot-term-eg-volt-dof-of-node-575\/"},"modified":"2021-04-16T07:33:33","modified_gmt":"2021-04-16T07:33:33","slug":"error-there-is-at-least-1-small-equation-solver-pivot-term-eg-volt-dof-of-node-575","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/error-there-is-at-least-1-small-equation-solver-pivot-term-eg-volt-dof-of-node-575\/","title":{"rendered":"* Error* there is at least 1 small equation solver pivot term (eg. VOLT DOF of node 575)"},"content":{"rendered":"

Greetings,nFacing the error while doing the analysisnAnalysis – The copper plate and a magnet are placed adjacent to each other with a certain gap. A velocity is given to the plate (-0.1m\/s) and the magnet remains stationary. So, as the plate move, the plate will see a change in a magnetic field by which eddy current will be generated in the plate and due to this current a magnetic field will be generated of opposite polarity as that of the magnet. Due to this generated magnetic field, the magnet experiences a force. I FMAGBC the copper plate and parallel flux as a boundary condition.nIn this analysis I have to calculate the eddy current generated in the copper plate and magnetic field generate the magnetic field due eddy current .nModel – <\/strong>nnnMarcos of the analysis.<\/strong>nfinin\/clen\/PREP7\u00a0\u00a0nnC*************************************************n!Element Tablen\u00a0nET,1,SOLID97n!*\u00a0\u00a0nET,2,SOLID97n!*\u00a0\u00a0nKEYOPT,1,1,1nKEYOPT,1,2,1nKEYOPT,1,5,0n!*\u00a0\u00a0nKEYOPT,1,1,1nET,3,SOLID97n!*\u00a0\u00a0nKEYOPT,3,1,0nKEYOPT,3,2,0nKEYOPT,3,5,0n!*\u00a0\u00a0n!*\u00a0\u00a0nKEYOPT,1,1,1nKEYOPT,1,2,1nKEYOPT,1,5,2n!*\u00a0\u00a0nKEYOPT,1,1,1nKEYOPT,2,1,0nKEYOPT,2,2,0nKEYOPT,2,5,2nn!Real Constant ValuenR,1,nRMORE, , , , ,0.1, ,nRMORE, , , , , ,n\u00a0\u00a0nC**************************************************n!Material PropertiesnMPTEMP,,,,,,,,\u00a0\u00a0nMPTEMP,1,0\u00a0\u00a0nMPDATA,MURX,1,,1.2289\u00a0\u00a0! Permeability of magnetnMPTEMP,,,,,,,,\u00a0\u00a0nMPTEMP,1,0\u00a0\u00a0nMPDATA,MGXX,1,,\u00a0nMPDATA,MGYY,1,,\u00a0nMPDATA,MGZZ,1,,9.26e5\u00a0\u00a0!coercive force of magnet\u00a0\u00a0nMPTEMP,,,,,,,,\u00a0\u00a0nMPTEMP,1,0\u00a0\u00a0nMPDATA,MURX,2,,0.999\u00a0\u00a0! Permeability of copper plate\u00a0\u00a0nMPTEMP,,,,,,,,\u00a0\u00a0nMPTEMP,1,0\u00a0\u00a0nMPDATA,RSVX,2,,1.72e-8 ! Resistivity of copper platenMPTEMP,,,,,,,,\u00a0\u00a0nMPTEMP,1,0\u00a0\u00a0nMPDATA,MURX,3,,1\u00a0\u00a0! Permeability of air\u00a0\u00a0nnC************************************************************************************n! GeometrynBLOCK,-0.013,0.013,-0.013,0.013,-0.0025,0.0025, ! copper plate\u00a0\u00a0nCYLIND,0.013, ,0.0055,0.0355,0,360,\u00a0\u00a0! magnet\u00a0\u00a0nBLOCK,-0.05,0.05,-0.05,0.05,-0.05,0.05, ! enclosed area\u00a0nnC*********************************************************************n! Overlap, Glue and Numbering Comp operation FLST,2,3,6,ORDE,2\u00a0\u00a0nFITEM,2,1\u00a0\u00a0nFITEM,2,-3\u00a0\u00a0nVOVLAP,P51X\u00a0nFLST,2,3,6,ORDE,3\u00a0\u00a0nFITEM,2,1\u00a0\u00a0nFITEM,2,-2\u00a0\u00a0nFITEM,2,4\u00a0\u00a0nVGLUE,P51X\u00a0\u00a0nNUMCMP,VOLUnnC************************************************************************n!Meshingn\u00a0nTYPE,\u00a0\u00a01\u00a0\u00a0nMAT,\u00a0\u00a0\u00a0\u00a02nREAL,\u00a0\u00a0\u00a0\u00a01\u00a0\u00a0nESYS,\u00a0\u00a0\u00a0\u00a00\u00a0\u00a0nSECNUM,\u00a0n!*\u00a0\u00a0nMSHAPE,1,3D\u00a0nMSHKEY,0n!*\u00a0\u00a0nCM,_Y,VOLU\u00a0\u00a0nVSEL, , , ,\u00a0\u00a0\u00a0\u00a01\u00a0nCM,_Y1,VOLU\u00a0nCHKMSH,’VOLU’\u00a0\u00a0nCMSEL,S,_Y\u00a0\u00a0n!*\u00a0\u00a0nVMESH,_Y1\u00a0\u00a0n!*\u00a0\u00a0nCMDELE,_Y\u00a0\u00a0nCMDELE,_Y1\u00a0\u00a0nCMDELE,_Y2\u00a0\u00a0n!*\u00a0\u00a0nTYPE,\u00a0\u00a02\u00a0\u00a0nMAT,\u00a0\u00a0\u00a0\u00a01nREAL,\u00a0\u00a0\u00a0\u00a01\u00a0\u00a0nESYS,\u00a0\u00a0\u00a0\u00a00\u00a0\u00a0nSECNUM,\u00a0n!*\u00a0\u00a0nCM,_Y,VOLU\u00a0\u00a0nVSEL, , , ,\u00a0\u00a0\u00a0\u00a02\u00a0nCM,_Y1,VOLU\u00a0nCHKMSH,’VOLU’\u00a0\u00a0nCMSEL,S,_Y\u00a0\u00a0n!*\u00a0\u00a0nVMESH,_Y1\u00a0\u00a0n!*\u00a0\u00a0nCMDELE,_Y\u00a0\u00a0nCMDELE,_Y1\u00a0\u00a0nCMDELE,_Y2\u00a0\u00a0n!*\u00a0\u00a0nTYPE,\u00a0\u00a03\u00a0\u00a0nMAT,\u00a0\u00a0\u00a0\u00a03nREAL,\u00a0\u00a0\u00a0\u00a01\u00a0\u00a0nESYS,\u00a0\u00a0\u00a0\u00a00\u00a0\u00a0nSECNUM,\u00a0n!*\u00a0\u00a0nCM,_Y,VOLU\u00a0\u00a0nVSEL, , , ,\u00a0\u00a0\u00a0\u00a03\u00a0nCM,_Y1,VOLU\u00a0nCHKMSH,’VOLU’\u00a0\u00a0nCMSEL,S,_Y\u00a0\u00a0n!*\u00a0\u00a0nVMESH,_Y1\u00a0\u00a0n!*\u00a0\u00a0nCMDELE,_Y\u00a0\u00a0nCMDELE,_Y1\u00a0\u00a0nCMDELE,_Y2\u00a0\u00a0n!*\u00a0\u00a0nnC****************************************n!Flag copper platennALLSEL,ALL\u00a0\u00a0nVSEL,S, , ,\u00a0\u00a0\u00a0\u00a01\u00a0nESLV,S\u00a0\u00a0nCM,A,ELEM\u00a0\u00a0n!*\u00a0\u00a0n!*\u00a0\u00a0nFMAGBC,’A’\u00a0\u00a0nFLST,2,6,5,ORDE,2\u00a0\u00a0nFITEM,2,11\u00a0\u00a0nFITEM,2,-16\u00a0nDA,P51X,ASYMnALLSEL,ALL\u00a0\u00a0nFINISHnC***********************************************n! Transient Solutionn\/SOLn!*\u00a0\u00a0nANTYPE,4n!*\u00a0\u00a0nTRNOPT,FULL\u00a0n!*\u00a0\u00a0nDELTIM,0.002,0,0nOUTRES,ERASEnOUTRES,ALL,ALL\u00a0\u00a0nKBC,0\u00a0\u00a0nTIME,0.01\u00a0\u00a0n\/STATUS,SOLUnSOLVE\u00a0\u00a0nAttaching the elements used in the analysis<\/strong>nElement ref 1 – for coppernElement ref 2 – for permanent magnetnElement ref 3 – for airnn Error<\/strong>nnNote – Some suggested to use SOLID236 element, but there are some papers which have calculated the results by using the SOLID97 even with more complicated model than this (Ex – https:\/\/www.scielo.br\/scielo.php?pid=S1679-78252016001101997&script=sci_arttext<\/a>). This is hypothetical model just to calculate the the various parameters, later use this concept for complicated models .nAs per the my understanding the problem might in the elements types option or loading nPlease suggest if any constrained is not defined or if any change required in the model. nYour Sincerely<\/p>\n","protected":false},"template":"","class_list":["post-54322","topic","type-topic","status-closed","hentry","topic-tag-3-d-model","topic-tag-eddy-currents","topic-tag-electromagnetic","topic-tag-magnetics","topic-tag-transient-analysis"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["26652"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["1$\/]"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["2808"],"_bbp_subscription":["231939"],"_bbpmt_movedon":["2022-08-26 07:58:13"],"_bbpmt_movedfrom":["27821"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["54322"],"_bbp_forum_id":["27793"],"_bbp_engagement":["50680","184894"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["150330"],"_bbp_last_active_id":["150330"],"_bbp_last_active_time":["2021-04-22 07:42:11"]},"test":"d_d"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/54322","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/54322\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=54322"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}