Electrical Machines
Transformers, DC machines and induction motors look like three subjects and are one: a changing flux linking a coil. These topics animate the flux and the force rather than starting from the equivalent circuit.
Start from the beginning →1 topic you can watch now, 23 still to come.
Electromechanical energy conversion
The one principle the whole subject is an application of.
- Magnetic circuits and reluctance
- Faraday's and Lenz's laws
- Force and torque from a field
- Hysteresis and eddy current losses
Transformers
A machine with no moving parts, and the easiest one to reason about.
- Ideal transformer and turns ratio
- Equivalent circuit and referred quantities
- Open-circuit and short-circuit tests
- Regulation and efficiency
- Autotransformers and three-phase connections
DC machines
Commutation: mechanically switching the current to keep torque up.
- Construction and armature windings
- EMF and torque equations
- Shunt, series and compound characteristics
- Starting and speed control
- Armature reaction and commutation
Induction machines
The workhorse: no brushes, no supply to the rotor at all.
- Rotating magnetic field
- Slip and rotor frequency
- Torque-slip characteristic
- Starting methods
- Speed control and single-phase motors
Synchronous machines
The machine that generates almost all the world's electricity.
- Alternator construction and EMF equation
- Voltage regulation methods
- Parallel operation and synchronisation
- Synchronous motor and V-curves