3 Phase-controlled DC motor drives

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• Fig. 3.7 is the <strong>controlled</strong>-converter operationwith negative average voltage (α > 90º).
• In the case that the load current is discontinuous, theaverage output isVdc1= ∫πα+γαVmsin( ωst)d( ωs[cos( α)− cos( α +where γ is the current conduction angle.• For certain value of γ, the output voltage fordiscontinuous conduction can be greater than thatfor continuous conduction.• For example, let α+γ=π, and α = 30VVdcdc(dis)(con)=t)=VπVmVm[cosα − cos( α + γ)]= 1.866ππ2Vm2Vm1.732 1.732Vcosα = =π π 2 π=mmγ)]
Page 1 and 2: 3 Phase-controlled DC motor drives
Page 3 and 4: • In field control, the applied a
Page 5 and 6: • Fig. 3.1
Page 7 and 8: • Similarly, the air gap power is
Page 9 and 10: 3.2.5 Four-quadrant operation• Du
Page 11 and 12: • Fig. 3.5 illustrates the speed
Page 13 and 14: • Two basic methods by using stat
Page 15: • The bridge conduction is delaye
Page 19 and 20: • Fig. 3.10 is a three-phase thyr
Page 21 and 22: • A control technique to overcome
Page 23 and 24: Control modeling• The gain of the
Page 25 and 26: • Fig. 3.15 is current source con
Page 27 and 28: • Fig. 3.17 is a half-controlled
Page 29 and 30: • Fig. 3.20 shows the converter c
Page 31 and 32: • The normalized electromagnetic
Page 33 and 34: where ω s = 2πf s , β = tan -1 (
Page 35 and 36: • Fig 3.24
Page 37 and 38: 3.6 Transfer functions of the subsy
Page 39 and 40: • Converter (after linearization)
Page 41 and 42: • Fig 3.30 is current-control loo
Page 43 and 44: • The closed-loop transfer functi
Page 45: 3.9 Four-quadrant Dc motor drive•

3 Phase-controlled DC motor drives

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