2 The Power Transformer
Power transformers are used mainly to transform (change) ac voltage from one voltage value to a different (smaller or
larger) voltage value.
Basically, a power transformer consists of two coils (windings) of insulated copper wire w
basic brush dc motors; these motors have carbon brushes and a metal segment commutator. There are also brushless
dc motors that are electronically commutated.
In a brush dc motor, the stator produces a stationary magnetic field, " s ", inside it
7 The 1- Induction Motor
All small electric motors (< 1 hp) used in domestic major appliances (washing m/c, clothes dryer, refrigerator, etc.)
are 1- SCIM's. The 1- SCIM also is found in industry for low power machinery simple drive applications. 1-