CH9 正弦稳态电路的分析

Ui va 4pqs p ui cos q ui sin s p q p s cos q

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Unformatted text preview: 何求取电路的谐振条件? 3 一、阻抗Z(导纳Y)的概念: & I 设:i = I m cos(ωt + ψ i ) + Z & U - u = U m cos(ωt + ψ u ) jψ & & 则:U = Ue jψ u I = Ie i & U U∠ψ u 阻抗: Z = & = I I∠ψ i = Z ∠ϕ = R + jX ϕ = ψ u − ψ i 阻抗角、相位差角 R − −电阻 U X − −电抗 阻抗模 Z= &I & & I I + & U + R - && U = IR Z = R & U I C - & & U = jX L I Z = jX L |Z| ϕ R 阻抗三角形 + & U & &...
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This document was uploaded on 01/12/2014.

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