Basic Electrical Installation Work

| Kategorie: Kniha  |

Strana 221 z 399

Jak získat tento dokument?






Poznámky redaktora
Single-phase a. The windings may be connected star delta and the end connections brought out slip rings mounted the shaft. The wound rotor consists laminated cylinder silicon steel with cop- per coils embedded slots around the circumference. The cage induction motor has small starting torque and should used with light loads started with the load disconnected. motors A single-phase a. supply produces pulsating magnetic field, not the rotating magnetic field produced three-phase supply.17 Construction cage rotor.c.c. Torque Speed (a) (c) (b) Load torque line FIGURE 10. Connection carbon brushes can then be made external resistance improve starting.c. The speed almost constant.Baisc Electrical Installation Work 210 Arrangement conductor bars cage rotor Skewed rotor conductors Shorting ring FIGURE 10. Reversal rotation achieved reversing any two the stator winding connections.18 Various speed–torque characteristics for induction motor. All a. Its applications are for constant speed machines such fans and pumps. Alternatively the load may connected after the motor has been run up to full speed. motors