4 Chopper-Controlled DC Motor Drive

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4.9 Steady-state analysis ... • 4.9.1 Analysis by averaging • The average armature current is I av Vdc − E = R a where V dc = dV s • The electromagnetic torque is T av = K b I av = K b (dV s -K b w m )/R a (N·m)
• The normalized torque is T en = T T av b / V / V b b = K b (dV K s b − K I R b a b ωm ) / / V b V b = dVn − ω R an mn , p.u. I R where R b a an = , p.u. V s V n = , p.u. ω m mn = , p.u. b Vb ωb • 4.9.2 Instantaneous steady-state computation (including harmonics) • The equations of the motor for on and off times (continuous current conduction) di V E R i L a s = + a a + a dt di 0 = E + R i L a a a + a , dt , 0 dT ≤ ≤ t t V ≤ ≤ dT T ω
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: 4.8 Other Chopper Circuits • Fig.
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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