AC Motors Several advantages Many types, no brushes, or commutators, or sparks Well suited, constant-speed Some, variable speed Varying builds, cheaper Aircraft electrical systems Typically, cd Hz AC Seven times speed of a 60 Hz aim, same pole count 6,000 to 24,000 revolutions per minute Gearing can create torque Types of AC drive universal push back Induction motors (several) Synchronous motor Universal motors Fractional AC series motors Operate on all AC or DC Brushes, commutator Fans, portable tools Induction motor overview Most popular AC motor No connections amongst 1. motor housing 2. rotating element No brushes, commutator, slip peal Fixed rpm, depending on 1. motor design 2. frequency of AC Single-or three-phase AC Single phase induction Lower mightiness requirements Requires startle circuit Starter must disconnect once motor is running Reversible, by start circuit Three- phase induction Self-starting High power requirement Starters, flaps, landing gear, hydraulic pumps Induction motor construction Two primary separate 1. stator 2.
rotor coil stator coil construction ? Windings in time slot ? Around stator periphery ? Series of electromagnetic rotor coil construction ? Iron core ? make kayoed circular laminations ? Soft steel, keyed in shaft ? longitudinal slot, sinister copper or aluminu m bars Stator windings contract ?! Revolving magnetic landing field ? voltage induced in bars 1. current flows in bars 2. adds magnetic field ? Rotor rotary motion nearly synchronous, stator field ? frail difference needed 1. produce torque 2. produce rotation ? Difference= motor slip Single-phase induction motor ? solitary(prenominal) iodine stator winding ? Field pulsates ? Expanding, collapsing field induces current...If you want to corrupt off a full essay, order it on our website:
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