## Power semiconductor controlled drives |

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3-phase air-gap angle control armature current back emf base speed braking operation Calculate capacitor chopper circuit of figure closed-loop constant flux controlled flywheeling controlled rectifier copper loss core loss current control current source inverter cycloconverter dc motor decrease diode bridge discontinuous conduction dynamic braking equivalent circuit field current firing angle full-load fully-controlled rectifier fundamental harmonic Hence increase induction motor interval load commutated load torque loop machine margin angle mode MOSFET motor current motor speed motor torque motoring operation negative obtained output voltage phasor power factor pulse-width modulation quadrant rad/sec rated torque ratio reactance reduced regenerative braking reverse ripple rotor resistance separately excited motor series motor shown in figure sinusoidal slip speed snubber source voltage speed control speed error speed-torque curves stator switch synchronous motor synchronous speed thyristor tion torque angle transistor turn-off voltage control voltage source waveform wound-field zero