Download Electric Motors

yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project

Document related concepts

Magnetoreception wikipedia , lookup

Electrical resistance and conductance wikipedia , lookup

Electromagnetic field wikipedia , lookup

Magnetotellurics wikipedia , lookup

Electromotive force wikipedia , lookup

Magnet wikipedia , lookup

Skin effect wikipedia , lookup

Electromagnetism wikipedia , lookup

History of geomagnetism wikipedia , lookup

Alternating current wikipedia , lookup

Electricity wikipedia , lookup

Lorentz force wikipedia , lookup

Ferromagnetism wikipedia , lookup

Force between magnets wikipedia , lookup

Friction-plate electromagnetic couplings wikipedia , lookup

Electromagnet wikipedia , lookup

Superconducting magnet wikipedia , lookup

Electric motor wikipedia , lookup

Machine tools (drill)
Appliances (blender, food processor)
Disk drives
How it works
• Simply put, an electric motor converts
electrical energy into mechanical energy
• They operate through interacting magnetic
fields and current-carrying conductors to
produce a force
• (This might sound familiar)
Parts of a Permanent-magnet motor
Brushed DC motor
Oscillating current in wound rotor
Split-ring commutator
Wound or permanent magnet stator
– friction as brushes press against communtator
– sparks can cause shorting through adjacent
sections (limits max speed, as melting of the
commutator may occur)
LHR for the motor principle
• If the thumb points in the direction of the
current flow (real current), fingers are the Bfield, palm is the force
• 𝐹 = 𝐼𝑙𝐵𝑠𝑖𝑛φ
• I is the current in the conductors, [A]
• l is the length of the conductor in the field [m]
• B is the magnetic field, [T]
Time to motor
• Motors are easy to make, so let’s try!
• Check out the following simple designs and try
to identify the parts
• Make sure the force on your coil agrees with