電路原理chapter9magneticallycoupledcircuits-資料下載頁
2025-09-25 18:59本頁面
【正文】 ?? ?211221222111 InLjUIMjLjUMnjMjILjUI ??????? ????????????Circuit model of an unity coupling transformer: 1Lj?21 In ??* * 1 ?I2 ?I+ – 2 ?U+ – 1 ?Un : 1 ideal transformer 2Lj?* * 1 ?I2 ?I+ – 2 ?U+ – 1 ?Un : 1 ideal transformer Ex1. The selfresistance of the power RS=1k?，RL=10?。 Determine the turns ratio n of the ideal transformer to ensure that RL absorb the maximum power. * * n : 1 RL + – uS RS Ex2. 1 ?I2 ?I* * + – 2 ?U+ – 1 ?U1 : 10 50? + – V010 o?1? . find 2 ?U9. 5 Circuit Models of Transformers 1. ideal transformer( perfectly coupling， lossless， m=? , linear transformer ) 21 UnU ?? ?211 InI ?? ?? 21 nuu ?211 ini ??* * + – + – n : 1 i1 i2 u1 u2 2. unitycoupling transformer(k=1， lossless ， m??， linear) 21212121 //NNLLLMMLnUU???????* * j? L1 1 ?I2 ?Ij? L2 j? M + – 2 ?U+ – 1 ?U 21 UnU ?? ?2111 1 j 1 InUωLI ??? ??* * j? L1 1 ?I2 ?I+ – 2 ?U+ – 1 ?Un : 1 ideal transformer L1： magizing inductance 0I?（ exciting current with no loads） 3. lossless transformer(k?1， m??， linear) ?21 i1 i2 + + – – u1 u2 ?12 ?1s ?2s N1 N2 )2 c o i l off l u x l e a k a g e( ) 1 c o i l off l u x l e a k a g e(2S12222121111??????????????SSS211222122111??????????????SS perfect coupling flux Circuit model of lossless transformer： * * L10 + – + – n : 1 Unitycoupling transformer L1S L2S i1 u1 u2 i2 + – u139。 + – u239。 L1S, L2S： leakage inductance 4. transformer with losses in the coils and ironcore(k?1，m??， linear) * * L10 + – + – n : 1 L1S L2S i1 u1 u2 i2 Rm R1 R2 Summary ： Transformers are essentially the coils having mutual inductances. There are some conventional methods to deal with them: Aircore transformer： L L M, store energy Ideal transformer： the turns ratio is n, neither store nor dissipate energy。 transform voltage 、current and impedance。 its equivalent circuit is： Z11 Zr n2Z2 Note： ideal transformer is different from unitycoupling transformer. ironcore transformer： L1, L2, n, M , R1, R2 .
黨政相關(guān)相關(guān)推薦
鄂ICP備17016276號(hào)-1