7. Motion from Electricity N S N S 3. Reversed poles of electromagnet, continue motion 2. Momentum keeps it turning when switched off 1. Stator magnets attract opposite poles of the electromagnet N S
Group Challenge: arrange yourselves into the electrical configuration of a doorbell. Parts needed: button/switch, battery, magnet, solenoid, gong, hammer/armature, spring & wires
STATOR "stays there" and ROTOR "rotates"
Review: Stator = permanent magnets, don't move Rotor = rotating armature (electromagnet, brush & split right commutator)
Review: Stator = permanent magnets, don't move Rotor = rotating armature (electromagnet, brush & split right commutator)
Brushes usually made of carbon - When the brushes reach the gap in the commutator, the circuit is broken, removing the magnetic field. - As it rotates further, the "other side" of the ring makes contact, switching the electromagnetic field of the rotor
What real motors look like.
Mary-go-round illustration: One person pushing a mary-go-round just once per rotation will result in a choppy spin that accelerates and slows according to when the push is given. However, if 8 people were positioned around the carousel to keep it going, the rotation would be much smoother.
A photograph of Michael Faraday , Thomas Henry Huxley , Charles Wheatstone, David Brewster and John Tyndall . Michael Faraday & Joseph Henry were the first to PROVE this connection
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