AC Motors Several advantages Many types, no brushes, or commutators, or sparks Well suited, constant-speed Some, variable speed Varying phase angles, cheaper Aircraft electrical systems Typically, cd Hz AC Seven times speed of a 60 Hz aim, same pole count 6,000 to 24,000 rpm Gearing can create torque Types of AC aim ordinary tug Induction motors (several) Synchronous motor Universal motors Fractional AC series motors Operate on both AC or DC Brushes, commutator Fans, portable tools Induction motor overview Most popular AC motor No connections between 1. motor housing 2. rotating element No brushes, commutator, slip ring Fixed rpm, depending on 1. motor design 2. frequency of AC Single-or three-phase AC Single phase induction Lower power requirements Requires startle circuit Starter must disconnect adept time motor is running Reversi ble, by start circuit Three- phase induction Self-starting High power requirement Starters, flaps, landing gear, hydraulic pumps Induction motor construction Two primary move 1. stator 2.
rotor coil stator coil construction ? Windings in one-armed bandit ? Around stator periphery ? Series of electromagnetic rotor coil construction ? Iron core ? make come forward circular laminations ? Soft steel, keyed in shaft ? longitudinal slot, sinister copper or aluminum bars Stator windings contr act ? Revolving magnetic world ! ? voltage induced in bars 1. current flows in bars 2. adds magnetic field ? Rotor revolution nearly synchronous, stator field ? discount difference needed 1. produce torque 2. produce rotation ? Difference= motor slip Single-phase induction motor ? solitary(prenominal) one stator winding ? Field pulsates ? Expanding, collapsing field induces current...If you want to bribe off a full essay, order it on our website:
BestEssayCheap.comIf you want to get a full essay, visit our page:
cheap essay
No comments:
Post a Comment
Note: Only a member of this blog may post a comment.