What is an electric motor?

1 Tháng Tám, 2018

 

Just about any electrical device that has moving parts inside uses an electric motor. An electric motor changes electrical energy into motion.

Electric motors operate:

  • air conditioners
  • refrigerators
  • electric toys, such as trains and cars
  • power tools.

A simple electric motor has several parts:

  • a source of power—such as a battery or a plug
  • a permanent magnet
  • a loop of wire that can spin
  • a motor shaft—a rod that can spin and move

Here is how a motor works:

  1. An electric current runs through the wire loop, making a magnetic field around the coil.
  2. The permanent magnet then pushes and pulls on the wire loop, making the loop spin.
  3. The spinning wire loop spins the shaft.
  4. The shaft, in turn, spins a wheel or gear. In larger motors, the loop of wire is a coil of wire. The coil is wound hundreds of times around an iron tube. This makes a very strong electromagnet for moving heavy objects or making things move very fast.

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