4 Chopper-Controlled DC Motor Drive

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• Transistor and diode currents for motoring operation in the continuous-conduction mode.
4.11 Pulsating Torque • The average of the harmonic torque is zero. • High-performance applications require the pulsating torque to be minimum. • The applied voltage is resolved into Fourier components as V where = V + ∞ a ∑ n=1 A sin(nω a (t) n c t n ) dT V a = Vs = dV T A n 2V = s nπ s nω dT sin c 2 ω θ c n 2π = 2πf c = T π nωcdT = − 2 2 + θ
Page 1 and 2: 4 Chopper-Controlled DC Motor Drive
Page 3 and 4: • The duty cycle d can be changed
Page 5 and 6: • Fig. 4.3 is first-quadrant oper
Page 7 and 8: • Fig. 4.5 voltage and current wa
Page 9 and 10: • Fig. 4.7 voltage and current wa
Page 11 and 12: • Fig. 4.9 waveform in third-quad
Page 13 and 14: 4.4 Chopper for inversion • Conve
Page 15 and 16: 4.6 Model of The Chopper • The tr
Page 17 and 18: • Its disadvantage: it cannot tra
Page 19 and 20: 4.8 Other Chopper Circuits • Fig.
Page 21 and 22: • The normalized torque is T en =
Page 23 and 24: • The solutions of the above equa
Page 25 and 26: • Hence, i a I a1 (t x = Vs − R
Page 27: 4.10 Rating of the device • The r
Page 31 and 32: 4.12 Closed-loop operation • Fig.
Page 33 and 34: • Fig. 4.22 is the implementation
Page 35 and 36: • Fig. 4.23

4 Chopper-Controlled DC Motor Drive

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