Basic Structure of Electric Machines
A rotating electric machine has two main parts, stator and rotor, separated by the air gap.
- The stator of the machine does not move and normally is the outer frame of the machine.
- The rotor is free to move and normally is the inner part of the machine.
- Both stator and rotor are made of ferromagnetic materials. Slots are cut on the inner periphery of the stator and the outer periphery of the rotor. Conductors are placed in the slots of the stator or rotor. They are inerconnected to form windings. The winding in which voltage is induced is called the armature winding.
- The winding through which a current is passed to produce the main flux is called the field winding.
- Permanent magnets are used in some machines to provide the main flux of the machine.
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