1. Motors and Generators

2. Electric Machine: Motor and Generator
stator & rotor
wiring types:
field winding: only provide field
armature: the coil carries only load current (input & output)

3. Types of electric machines

4. Performance Characteristics of Electric Machines
Energy Conversion efficiency: energy losses
Torque-speed characteristics
Starting torque
To provide better performance, a three-phase power are needed

5. Three-Phase Power
Phase voltage
Balanced:

6. Three-phase power: line voltage
It does not need forth wire (neutral connection

7. Three-Phase Power: constant instantaneous power

8. AC Synchronous Rotary Machines
AC machines are far more general than DC machines
little torque pulsation in three-phase machines. Can achieve constant torque.
Rotating magnetic field instead of DC magnetic field in DC machines.
f: frequency of the driving field
P: the number of poles