Electrical Engineering › Section Z · AC motors › Topic Z.1
Introduction to motors and generators
Electric motors turn a large share of the world's electricity into motion, and generators make that electricity in the first place. They are the same kind of machine, and a few ideas about force, induction, torque and loss explain them all.
In this topic
- One machine, two directions
- Motor action: force on a current
- Generator action and back EMF
- The brushed dc motor
- Worked example: back EMF limits the current
- Why ac motors came later
- Core losses: hysteresis and eddy currents
- Torque, speed, power and efficiency
- Worked example: power, efficiency and running cost
- A map of ac motors
- Common mistakes to avoid
- Key takeaways
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