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 |
Contents
DC MOTORS 355 | 35 |
CHAPTER 7 | 59 |
RECTIFIER CONTROL OF DC MOTORS | 65 |
Copyright | |
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3-phase ac source air-gap armature circuit armature current back emf base speed Calculate capacitor chopper circuit of figure closed-loop continuous conduction controlled flywheeling controlled rectifier copper loss core loss current source inverter cycloconverter d(wt dc link dc motor decrease diode bridge discontinuous conduction dynamic braking equivalent circuit field current filter firing angle firing pulses fully-controlled rectifier harmonic Hence increase induction motor inductor interval load commutated load torque machine magnet maximum MOSFET motor current motor drive motor speed motor torque motoring operation negative no-load obtained output voltage phase phasor power factor pulse-width modulation quadrant R₁ rad/sec rated torque ratio reduced regenerative braking reverse S₁ S₂ separately excited motor series motor shown in figure slip speed source current source voltage speed control speed error speed-torque curves stator switch synchronous motor synchronous speed T₁ thyristor V₁ variable frequency voltage source waveform zero