4 Chopper-Controlled DC Motor Drive

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• The solution for the armature current in three time segments is V E i (t) s − (1 e a a = − ), 0 < t < R i a (t) = I a1 e a (t−dT) − T a − − t T E R a (1 − e dT (t−dT) − T ia (t) = 0, (tx + dT) < t < a ), T dT ≤ t ≤ t x - dT
4.10 Rating of the device • The rms value of the power switch current I t = 2 max I 2T (T + dT) = 1+ d 2 max • The average diode current I 1− d = ( ) ⋅ 2 d I max ⋅ I
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: • Hence, i a I a1 (t x = Vs − R
Page 29 and 30: 4.11 Pulsating Torque • The avera
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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