70 pages matching variable frequency in this book
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RECTIFIER CONTROL OF DC MOTORS
CLOSEDLOOP CONTROL OF DC DRIVES
8 other sections not shown
3-phase air-gap angle control applications armature current armature voltage back emf base speed braking torque Calculate capacitor chopper circuit of figure closed-loop controlled rectifier copper loss core loss current control current source inverter cycloconverter dc link dc motor decrease diode bridge discontinuous conduction dynamic braking equivalent circuit field current firing angle fundamental harmonic Hence IEEE Trans increase induction motor load commutated load torque machine magnet margin angle mode MOSFET motor current motor drives motor speed motor torque motoring operation negative obtained output voltage phasor power factor pulse-width modulation quadrant rad/sec ratio reactance reduced regenerative braking reverse ripple rotor resistance semiconductor separately excited motor series motor shown in figure slip speed snubber source voltage speed control speed-torque characteristics speed-torque curves stator switch synchronous motor synchronous speed thyristor torque angle transistor turn-off variable frequency voltage control voltage source waveform zero