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第七章 电动机 PowerPoint PPT Presentation


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第七章 电动机. 第一节 三相异步电动机的基本结构 第二节 三相异步电动机的工作原理 第三节 三相异步电动机的电磁转矩与机械特性 第四节 三相异步电动机的使用 第五节 三相异步电动机的铭牌和技术数据 第六节 单相异步电动机 第七节 三相同步电动机 第八节 直流电动机 第九节 控制电机. 三相异步电动机 的结构及制造工 艺录像片. 习 题. 目录. 第一节 三相异步电动机的 基本结构. 定 子 转 子. 返回. 直流电动机. 电动机. 交流电动机. 同步电动机. 交流电动机.

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第七章 电动机

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A2

B2

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C1


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A

Z

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iC

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1.

120Y


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iC

iA

iB

i

t

  • iA = Imsint

  • iB = Imsin (t120)

  • iC =Imsin(t- 240)

    O


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    A

    n1

    Y

    Z

    N

    S

    iC

    iA

    iB

    i

    iA > 0

    iA = 0

    iA > 0

    iA < 0

    t =60

    iB < 0

    C

    t =180

    t =120

    t =240

    iB> 0

    iB = 0

    iB > 0

    B

    iA = 0

    A

    iC = 0

    iC < 0

    iC < 0

    iC= 0

    X

    t =0

    t

    iB < 0

    Y

    Z

    iC > 0

    S

    N

    C

    B

    A

    A

    A

    X

    Y

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    S

    Y

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    120

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    S


    6115555

    n1

    n1

    2.

    ABC

    AC B


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    3

    p = 1

    n1=60 f 1 (r/min)

    p = 2

    0.5

    n1=60 f 1 /2 (r/min)


    6115555

    n1 p f1


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    n1

    F

    n

    F

    N

    S

    n1=0,

    n10

    n1

    n


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    nn1 nn1

    S

    S

    S0.020.06

    n = 0 , S = 1


    6115555

    nN= 980r/min f1= 50Hz ,n1pS

    0.020.06 nNn1


    6115555


    6115555

    T TL

    T = TL

    T < TL

    T > TL


    6115555

    I2

    T I2

    I2E2222cos2

    T I2I2cos2

    T = KT mI2cos2

    KT


    6115555

    u1

    e2

    e1

    i1

    i2

    f1

    f2

    u1 e1

    1.

    = msint

    e1 = -N1d/dt

    uZe1

    U1E1=4.44f1N1 m

    f1=pn1/60


    6115555

    2.

    E2=4.44f2N2 m

    e2 = -N2d /dt

    E2f2n1n

    f2= pn1-n/60

    = Sf1

    E2=4.44 Sf1N2 m

    n = 0S =1

    f2= f20= pn1/60= f1

    E20= 4.44 f1N2 m

    E2=SE20


    6115555

    Z2 = R2+X2

    X2=2 f2LS2= 2S f1LS2

    S=1, X20= 2 f1LS2

    X2=SX20


    6115555

    I2 cos2

    1

    S

    1

    I2cos2S

    S =1n =0

    I2

    I2 ,

    cos2

    cos2

    O

    n SI2


    6115555

    3.

    T = KTI2cos2


    6115555

    T

    Tmax

    Sm

    1

    S

    1.

    KTU1R2X20T=f (S)

    S 0 <S < Sm S T

    S Sm < S < 1 S T

    Sm=R2/X20

    Tmax=KTU12/2X20

    Tmax Sm .

    O


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    T

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    Tmax

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    U12

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    T

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    R2

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    Sm

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    TmaxR2

    R2 < R2

    O

    2.

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    6115555

    n

    A

    n1

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    B

    nm

    T

    C

    Tmax

    TN

    Tst

    n = f (T)

    n > nm(AB S

    TLT >TLn S

    T T =TL

    0<n < nm(BC


    6115555

    Tn

    TN PNnN

    Nm

    kW

    r/min

    Tmax

    TL>Tmax


    6115555

    m1.82.2 m

    Tst n = 0S = 1

    S=1

    Tst U12TstR2

    U1TstR2 Tst


    6115555

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    1

    S

    1

    S =

    Tst=(12.2)TN

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    I2

    S =1n =0

    I2 ,

    n SI2

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    n

    n

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    R2

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    U Tmax

    R2 Tst

    R2 Tmax


    6115555

    1,U1=220V, f1= 50 HznN=1425r/minR2=0.03X20=0.09p=2E1/E20 =11 :(1)E20f20I20 cos20 (2)nNE2f2I2 cos2

    U1E1= 220V

    E20=E1/11=20V

    nN n1 =60f1 / p =1500r/min

    f20= f1=50HZ

    SN=(n1nN)/nN=0.05

    E2=SE20=1V f2=Sf20=2.5Hz X2=SX20=0.0045


    6115555

    S =

    2TN=65.9NmnN=1450r/min1.42.0TmaxTst PN

    Tst1.465.992.9Nm


    6115555


    6115555

    1.

    • ,

    • Tst > TL

    • Ist

    Ist=(57)IN


    6115555

    2.

    • Ist PN 10kW 20%5%

    • U1


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    IstY=UP /z

    S2

    Ist=


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    Y Y1/3

    IstY/Ist =1/3

    Y Y1/3

    TstY/Tst =1/3


    6115555

    30kW1470r/min57.5ATst/TN=1.2 Ist/IN=7 (1)Y(2)60%25%Y

    TN= 9550301470Nm = 194.9Nm

    TL=0.6TN=0.6194.9Nm=116.94Nm

    TL > TstY

    TL=0.25TN=0.25194.9Nm=48.725Nm

    TL < TstY

    Ist = 7 IN = 757.5A =402.5A

    Y

    IstY= Ist/3 = 402.53 A= 134.17A

    TstY= Tst/3 = 1.2194.93 Nm=77.96Nm


    6115555

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    S2

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    A

    B

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    U1

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    Ist

    IstT

    U1 / U2 = K > 1

    Ist= U1/z

    Ist= U2 / z = Ist / K

    IstT= Ist K=Ist /K2

    TstT=Tst /K2

    1 / K2


    6115555

    Y

    RstRstRst


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    I1 cos1

    I1

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    3. = f (P2)

    = P2/P1

    P2=0

    =0

    P2

    2. cos1= f (P2)

    P2=0

    cos1

    P2 cos1

    • I1= f (P2)

    • P2=0

    • I1= I10 (

    • P2 I1

    O


    6115555

    1PN=40kW,Y/,UN=380V/220V, nN=1460r/min, N=0.895, cosN=0.89, Ist /IN=5.5, Tst /TN=1.1,Tmax /TN=2P1N , IN , TN , SN , Tst , Tmax , Ist , f2N

    Ist= 5.5 IN= 5.5132A = 726A

    IstY= 5.5 INY= 5.576A =418A

    Tst=1.1TN=2621.1Nm=288Nm

    Tmax=2TN=2262Nm=524Nm

    f2N=Sf1=0.02750Hz=1.35Hz


    6115555

    2Y132S-4,SNINTNTstTmaxIst

    p= 2, n1=1500r/min

    Ist= 7 IN=81.48A

    Tst=2.2TN=324.9Nm

    Tmax=2.2TN=324.9Nm


    6115555

    3PN=10kW, , UN=380V, nN=1460r/min, N=0.88, N=0.88, Ist /IN=7, Tst /TN = 1.3, T = 2f =50Hz (1) pINTNSNTstTmaxIst

    (2)TL=55Nm,U0.9UN YIstYTstY

    Y IstY=Ist/3=45.7A

    TstY = Tst/3 = 28.3Nm < TL=55Nm

    nN=1460r/min n1

    Ist= 7 IN=137.2A Tst=1.3TN=85Nm

    Tmax=2TN=130.8Nm

    Tst(U)2 Tst =(0.9)2Tst=68.85Nm

    Tst > TL

    p= 2, n1=1500r/min


    6115555

    4Y160M-2PN=15kW, , UN=380V, nN=2930r/min, N=0.882, N=0.88, Ist /IN=7, S= 2, M= 2.2150ATL=60Nm,(1)(2)(3)

    TN< TL=60Nm

    Tmax> TL

    Tst> TL

    Ist>150A

    Tst=2TN=97.8Nm Tmax=2.2TN=107.58Nm

    Ist= 7 IN=205.45A


    6115555

    5

    . ______ A. ; B. , E1=0 ; C. n=0 , S=1>> SN , I2

    C

    . 10%,, ______

    A. ,,;

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    C. ,,

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    .,______ A. B. C.

    C

    . ,________ A. B. C.

    B


    6115555

    . _____A. B. C.

    C

    . PN=30kW,UN=380V,, Tst /TN = 1.2,TL=0.3TN________________

    Y

    TstY/Tst=1/3

    TstY=0.4 Tst > TL= 0.3TN


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