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1、电磁铁发热原因分析很多电磁铁用户在使用过程中发现电磁铁发热严重，磁力下降的现象。让电磁铁温度降 一降又会好一些。这到底是什么原因造成的呢？该怎么样杜绝这样的事情呢？ 第一、 发热的原因。1、电压一定的情况下，电阻太小。 电阻、电压、电流之间的关系是： U=RI 。当电压一定的时候，电阻越小，电 流越大。单位截面通过的电流越大，漆包线发热越大。线圈越发热，电阻会越 高，通过的电流就会越小。因此，电磁铁的吸力会下降。凉了以后又会恢复。、 、 相关公式：磁场B=（T）S磁势F=NI,电流和匝数的乘积（A）NI磁场强度H=（A/m）LB 磁导率卩=- HNI磁通=玄一RM磁阻rm=卩s2、材质问题。通
2、常所说的漆包线是指铜漆包线。也就是说导体是铜的。但是铜 又分新铜和回收铜。回收铜杂质较多，导电性较新铜差。同等条件下发热量也 大。 还有一种是铜包铝线，这种线抗拉抗疲劳都较铜线差。杂质和铝材的导 通性能导致发热严重。漆包线及铜包铝线的相关参数如下：A:铜漆包线参数:铜芯标称直径（毫米）漆包线最大外 径（毫米）铜芯截面积（平 方毫米）+-直流电阻（欧/千米）漆包线重量 （公斤/千米）每厘米可绕 圈数近似的英规SWG铜线线号铜芯直径（毫米）漆包线 直径（毫 米）0.030.0450.0007065247040.012222.2490.0300.040.0550.001257139200.01518
3、1.8480.0410.050.0650.00196389490.019153.8470.0510.05710.060.0750.00282761980.027133.3460.0610.06660.070.0850.00384845560.036117.6450.0710.07850.080.0950.00502734870.047105.3440.0810.0890.090.1050.00636227580.05995.2430.0910.0990.100.120.00785422370.07383.3420.1020.1120.110.130.00949818460.08876.9410
4、.1120.1240.120.140.0113115510.10471.4400.1220.1350.130.150.0132713220.12266.7390.1320.1450.140.160.0153911390.14162.50.150.170.017679930.16258.8380.1520.1680.160.180.020118720.18455.60.170.190.022707730.20852.6370.1730.1880.180.200.025456890.23350.00.190.210.028356180.25947.6360.1930.2110.200.2250.0
5、31425580.28744.40.210.2350.034645060.31642.6350.2130.2310.230.2550.041554220.37839.2340.2340.2540.250.2750.049093570.44636.4330.2540.2770.270.310.057263060.52232.3320.2730.2980.290.330.066052650.60130.3310.2950.320.310.350.075482320.68928.6300.3150.340.330.370.085532050.78027.00.350.390.096211820.87
6、625.6290.3450.3760.380.420.11341551.0323.8280.3760.4060.410.450.13201331.2022.2270.4170.450.440.490.15211151.3820.40.470.520.17351011.5719.2260.4570.4870.490.540.188639.01.7118.50.510.560.204385.91.8617.9250.5080.560.530.580.220679.52.0017.20.550.600.237673.72.1616.7240.5590.600.570.620.255268.72.30
7、16.10.590.640.273464.12.4815.60.620.670.301958.02.7314.9230.6100.6550.640.690.321754.52.9114.50.670.720.352649.73.1913.90.690.740.373946.93.3813.50.720.780.407243.03.6712.8220.7110.760.740.800.430140.73.9012.50.770.830.465737.64.2112.00.800.860.502734.84.5511.6210.8130.870.830.890.541132.44.8911.20.
8、860.920.580930.15.2510.90.900.960.636227.55.7410.4200.9140.980.930.990.679325.86.1310.10.961.020.723824.26.539.81.001.070.785422.47.109.41.041.120.849520.67.648.9191.0161.081.081.160.916119.18.278.61.121.200.985217.88.868.31.161.241.05716.69.538.11.201.281.13115.510.27.8181.2191.291.251.331.22714.31
9、1.17.51.301.381.32713.211.97.21.351.431.43112.312.97.01.401.481.53911.313.96.8171.4221.491.451.531.65110.614.96.51.501.581.7679.9315.96.31.561.641.9119.1717.26.11.621.712.0618.5018.55.8161.6261.711.681.772.2177.9119.95.61.741.832.3787.3721.45.51.811.902.5736.8123.15.3151.8951.921.881.972.7766.3124.9
10、5.11.952.042.9875.8726.84.92.022.123.2055.4728.94.7142.0322.132.102.203.4645.0631.14.52.262.364.0124.3736.24.2132.3372.442.442.544.6763.7542.23.9B:铜包铝漆包线的参数:标称 直径取大 外径极限偏差 （土）最小漆膜 厚度1米电阻允许击穿最氐电压最小(Q /m)最大(Q /m)电压（KV）扭绞数（个）0.2000.2390.0030.0270.52370.56593.5330.2100.2520.0030.0290.47570.50363.7330.22
11、00.2620.0030.0290.43400.46623.7330.2300.2770.0040.0320.39410.42983.9330.2500.2970.0040.0320.33450.36283.9330.2700.3190.0040.0330.28750.31034.0230.2900.3420.0040.0350.24970.26844.1230.3100.3620.0040.0350.21890.23444.1230.3300.3860.0040.0380.19340.20664.3230.3500.4060.0040.0380.17220.18344.3230.3550.4110.0040.0380.16740.17824.3230.3800.4390.0050.0400.14560.15614.4160.4000.4590.0050.0400.13
