4 Chopper-Controlled DC Motor Drive

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• Its frequency of operation is f 1 + t c = = (ton off ) 1 T and its duty cycle is defined as d = t T on • Assuming that the switch is ideal, the average output is t V on dc = Vs = T dV s • varying the duty cycle changes the output voltage.
• The duty cycle d can be changed in two ways: (i) varying the on-time (constant switching frequency). (ii) varying the chopping frequency. • Constant switching frequency has many advantages in practice.
Page 1: 4 Chopper-Controlled DC Motor Drive
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 and 28: 4.10 Rating of the device • The 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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