: The stationary outer part, often containing field magnets or windings. Rotor : The rotating inner part supported by bearings.
At their most fundamental level, electrical machines rely on the interplay between , magnetic fields , and mechanical motion .
: The rotor rotates slower than the magnetic field (known as slip ). These are the most common industrial motors. Modern Trends in Technology
: The rotor rotates at the exact same speed as the stator's magnetic field.
: While static (no moving parts), they are considered electrical machines because they use magnetic fields to change voltage levels. 2. By Power Supply
: For motors, current in a wire creates a magnetic field that interacts with a second field (usually from a permanent magnet or electromagnet), producing a Lorentz force that turns the rotor.
Electrical machines are broadly classified by their function and the type of power supply they use. 1. By Function
: Run on direct current. They often use a commutator to periodically reverse the current flow in rotor windings to maintain rotation.