电磁电器设计基础：第六章 线圈及其热计算

rzbLLrzb1d(a)层叠式1d(b)间叠式rzbLLrzb24dWfLb24rzrzrzdWfL brzff电阻损耗22(W)UPPI RR或(J)WPtoJ/CCmc211211()RR 212111(234.5)RRR涡流和磁滞损耗22(W/kg)100100chfmffpB允许温度及温升00,maxjxjx热传导dddTnQStn 对 流V12x0.25dldlPKS热辐射84405.7 10()(W)fPTTS牛顿散热公式和综合散热系数(W)scddlfsPPPPKS大气压力对线圈温升的影响0.4800(/)dldlKKp p线圈的热平衡方程式TscTscQQQQQQ或22dddddssI R tCK StI RCK St或长期工作制01 eerrttTTw2ddsI RCK Sto(C)wsPK S(s)rsCTK S1 ertTww00.632w00rTrT4tw0.368wrTt0ertTwd0dsCK StwrTo(C)wsPK S(s)rsCTK S短时工作制1 ertTw（a）温升曲线dsIti0（b）线圈电流dstwd0dPPTrTr2Tr3Tr4Tr5twd/11 edsrdwdtTwPpP/11 edsrdsitTIppI/rdspTt/irdspTt反复短时工作制12/2/(1)/(1 e)1 eeeerrrrrtTT TT TKT TKwftTKK 1/(1 e)(1 e)1 errrtTKT TKwfT T t(a)温升曲线（b）线圈电流T1t2tdsIiwfkk 121 2 wt121112/1/11/21/22(1 e)e(1 e)e(1 e)(1 e)errrrrrrt TwftTt Tt Twft TT TwftT 1/11 e1 e1 errrT TfwftTKT TwPpP111111rrTTTpttT1iTpt1100%tqT1/pq1/ipq线圈温升的实际情况126038010 15.51电压线圈；2电流线圈；虚线指数曲线)(sto(C)0铁芯线圈R2RmrdrR1线圈轴0246820406080（a）线圈内表面与铁芯导热不良（b）线圈内表面与铁芯导热良好直流曲线交流曲线（mm）xxlm2（）1 0铁芯线圈R2RmrdrR1线圈轴（a）线圈内表面与铁芯导热不良xlm21220220()()mTmmlmrRprR lrRpRr l 221212121112221()2111lnssmssRRRRKKRRK RK RR22202220ln22ln22mmmmmmmmmmprRrrRRRpRRrrRRr 1111/103(0.450.55)()(1 e)rrrst TwtTCc mc mc mc mCTK S 铜铜附附绝绝铁铁2222/13(0.450.55)()(1 e)rrrst TwtTCc mc mc mc mCTK S铜铜附附绝绝铁铁基本计算公式2242241010()4ppD WD WlRfLbdd224()10(W)pD IWPI RfLb2wssI RPK SK SwfKwfqp 24o10(C)2psDIWK fbLwddswdwdrtqpTbcdpDL()0.2pD IWdU22104fLbWdbcdpDL线圈设计方法电压线圈2342()2 10sjxq IWbK fLb()0.2pD IWdUbcdpDL2210()4fLbWd匝sKw电流线圈()IWWI匝考虑电压的变化和线圈电阻及匝数的公差maxmaxminmin()0.2pxhxhRWD IWRWdUmaxmaxmaxmaxminmin()()xhxhURWIWIWURW2342()2 10sjxq IWbK f 线圈参数改变时的换算2112dUdU()0.2pD IWdU21212221WdUWUd221121222212RW dURW dU22104fLbWd22410pD WRd142dqd2122211WdWqd2112221RWRqW12()()IWqIW