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电机与拖动第七章(Motor and drive chapter seventh)
电机与拖动第七章(Motor and drive chapter seventh) Seventh chapters Verse 1 Electric traction of three phase asynchronous motor Mechanical characteristics of three phase asynchronous motor The mechanical characteristics of three-phase asynchronous motor is refers to the relationship between the speed and torque of the motor, because there is a certain relationship between the motor speed and slip ratio, the relationship between, because there is a certain relationship between the motor speed and slip, said. The mechanical characteristics of an asynchronous motor are usually expressed by Te = f (S). I. three expressions of mechanical characteristics (1) physical expressions = I 2 E2 (R / s) + X 22 2 sigma Cos = 2 = ` R2 / s (R2 / s) 2 + X 2 sigma With the motor slip, the S varies with the slip S of the motor (two) parameter expression According to the simplified equivalent circuit of the asynchronous machine, the simplified equivalent circuit of the asynchronous machine can be obtained = I2 U1 2, R? \ R1 + + + (X 1 sigma + X 2 sigma) s?? 22 Substitution formula Two When fixing U1 and F1, it is called T, S curve (1), rated working point B, rated working point B You can draw the relationship between the curves, you can draw the relationship between the curves, S = sN N = nN I1 = I1N Three Starting point A (2) starting point A ` 3U12 R2 Tst = 2 22 PI F1 (R1 + R2) + (X 1 sigma + X 2 sigma) P Starting torque multiple: starting torque multiple: ideal no-load speed point H (3) ideal no-load speed point H Tst, K, St = TN Speed n = N0 (s = 0), electromagnetic torque Te = 0, rotor current I 2 = 0, stator current I1 = I10, Four Maximum torque point P (4) maximum torque point P DTe = 0, get the slip Te = Tm, S, m, dS SM = + Tm = + R 2 R12 + (X 1 sigma + X 2 sigma) 2 3 pU 21 ` 4 PI F1 + R1 + R12 + (X 1 sigma + X 2 sigma) 2??? Torque overload factor: torque overload factor: Tm KT = TN Five (three) practical expressions S will type M= R2 One R12 + (X 1 sigma + X 2 sigma) 2 Substituting the
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