4 Chopper-Controlled DC Motor Drive

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4.5 <strong>Chopper</strong> with other power devices • MOSFETs, IGBTs, GTOs, or SCRs are used for different power level. • The MOSFET and transistor choppers are used at power levels up to 50kW.
4.6 Model of The <strong>Chopper</strong> • The transfer function of the chopper is G r K (s) = r sT 1+ 2 where K r = V s /V cm , V s is the source voltage, and V cm is the maximum control voltage. • Increasing the chopping frequency decreases the delay time, and its becomes a simple gain.
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: 4.4 Chopper for inversion • Conve
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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