熱時定数

計算
http://okwave.jp/qa/q2960729.html

○
http://www.ohizumi-mfg.jp/product/technote1.html#7
○
http://www.matsuo-ele.com/products/060_tech_tps_04.html

二次遅れ
http://www.k5.dion.ne.jp/~ajima/HEAT/HEAT.htm
△
http://www.miyazaki-gijutsu.com/series/control313.html
http://www.miyazaki-gijutsu.com/series/control323.html