ELECTRICAL MACHINERY GENERALIZATIONS

ELECTRICAL MACHINERY GENERALIZATIONS

1. GENERATOR – mechanical energy's is converted into electrical energy.
2. MOTOR- electrical energy is converted to mechanical energy.
3. PRIME MOVER- a mechanical machine that drives the electric generator.
4. AMRATURE WINDING- a laminated steel core containing current carrying copper wires.
5. ROTARY CONVERTER- electrical energy of one form is charged into electrical energy of another.
6. FREQUENCY CONVERTER- its function is to change ac electrical energy at one frequency energy at another frequency.
7. SHUNT GENERATOR / SELF EXCITED SHUNT GENERATOR- if the excitation is produced by a simple winding connected to the positive and negative brushes.
8. SEPARATELY EXCITED SHUNT GENERATORS- excitation is produced by a single winding connected to the positive and negative bus bars fed by another dc generators.
9. COMPOUND GENERATORS- has two complete sets of field windings for excitation purposes.
10. SERIES GENERATORS- a generator that contains series field for control purposes.
11. ALTERNATORS- constructed that armature series and its windings are stationary while the field poles rotate.
12. SHUNT MOTOR- a motor in which the field windings is connected in parallel with the armature.
13. SERIES MOTOR- a field winding that is connected in series with armature.
14. COMPOUND MOTOR- a motor that is excited by a combination of a shunt field connected in shunt with the motor and a series field with the armature.
15. SHADED POLE AND RELUCTANCE MOTOR- are built in very small sizes, they are cheap to construct, have low starting torque, little overload capacity and low efficiency and maybe speed controlled.
16. SPLIT-PHASE MOTOR- are manufactured in sizes up to about ¾hp, they are comparatively low in cost, have fair starting torque, not much overload capacity and fair efficiency and operate at nearly constant speed.
17. CAPACITOR-START SPLIT-PHASE MOTORS- when a split phase motor equipped with capacitors have high starting torque used only during the starting period.
18. TWO-VALVE CAPACITORS- a split phase motor that uses two valves of capacitor for starting and running.
19. UNIVERSAL MOTORS- series motors that are constructed for series on direct or alternating current up to 60 hertz.
20. SYNCHRONOUS MOTORS- operate at synchronous speed determined by the frequency of the supply and the no. of poles on the machine.
21. POLYPHASE MOTORS- machines served with two or three phase powers.
22. SQUIRREL CAGE INDUCTOR MOTOR- polyphase motors which desirable all purpose characteristics.
23. WOUND ROTOR – replaces the squirrel cage motor due to its speed control.
24. SCHRAGE MOTOR – a special motor construction that has wide speed control possibilities.
25. TRANSFORMER – a simple device used primarily for the purpose of changing voltage from one valve to another.
26. AUTO TRANSFORMER – when the electric circuit of transformers are joined together.
27. PRIMARY – the transformer winding that is connected to the supply.
28. SECONDARY – when the winding feeds the load.
29. STEP – UP – transformer that raises the primary voltage to a higher valve.