Inside an Electric Razor

Electric razors share a remarkable similarity to electric screwdrivers! When you take apart a razor you find:

  • A rechargeable battery
  • A switch
  • An electric motor
  • A gear system
  • The blades that cut the whiskers

­Here is the razor we will be exploring today:

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When you take the cover off, you find the parts nestled inside very compactly:

The batteries and motor are a unit, and they come out fairly easily. In this picture you can also see the switch on the inside of the front cover:

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Printed Circuit Board

The batteries are bonded to the printed circuit board that also contains the charging system, the contacts for the switch and the motor controller. A printed circuit board is a thin piece of fiberglass with copper wires etched on it's surface (we also saw a PCB in the remote control we took apart).

There is also a very tiny auxiliary PCB that holds the 2 LEDs. These LEDs indicate that the battery needs recharging, that the razor is on or that the razor is recharging.

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The business end of the razor consists of three rotating blades. The blades engage on three shafts, all of which mesh with the motor's gear in a direct-drive system.

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