Power Semiconductor Controlled DrivesA study of power semiconductor controlled drives that contain dc, induction and synchronous motors. Discusses the dynamics of motor and load systems; open and closed-loop drives; and thyristor, power transistor, and GTO converters. Also reviews arc drives, brushless and commutatorless dc drives, and rectifier controlled dc drives. Annotation copyrighted by Book News, Inc., Portland, OR |
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3-phase ac source air-gap armature current armature voltage back emf base speed Calculate capacitor chopper circuit of figure closed-loop continuous conduction controlled flywheeling controlled rectifier copper loss core loss current control current source inverter cycloconverter d(wt dc link dc motor decrease diode bridge discontinuous conduction dynamic braking equivalent circuit field current firing angle full-load fully-controlled rectifier fundamental harmonic Hence IEEE Trans increase induction motor load commutated load torque machine magnetizing maximum MOSFET motor current motor drives motor speed motor torque motoring operation negative no-load speed obtained output voltage phasor power factor pulse-width modulation quadrant R₁ rad/sec rated torque ratio reactance reduced regenerative braking reverse ripple rotor resistance S₁ S₂ separately excited motor series motor shown in figure slip speed source voltage speed control speed-torque curves stator switch synchronous motor synchronous speed T₁ thyristor tion V₁ variable frequency voltage source waveform zero