Class 15 Electrical Power, continued

Class 15 Electrical Power, continued

AC Power

AC Voltage Average magnitude

PP Presentation

Sources of magnetic fields

The transformer

Transformer Equation Iin Vin = Iout Vout

Motors equilibrium condition (ie,stuck)

Remember that a coil produces a magnetic field

Replace rotating magnet with coil (equilibrium condition)

Replace rotating magnet with coil (rotating coil)

Basic motor trick; switch poles

Motor through 1 rotation

Switching the current: commutator

Commutator

Commutators

Can I use AC ?

Easier : “rotate” outside field

AC motor

Induction motor : induce center

Single Phase power

3 Phase power

Why 3 Phase Power?

3 Phase power - each 120 degrees apart

“Vector” diagram

PP Presentation

2 available voltages

Common household power

Why 240V? Transformer trick - 3 wires

3 wire household wiring

Next time

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