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What is Fleming’s left-hand rule for electric motors?

Sir John Ambrose Fleming was a British electrical engineer and physicist (1849-1945) known for inventing the first vacuum tube.

In addition, Sir John devised what is commonly known as Fleming’s left-hand rule, a simple mnemonic for calculating the direction of motion in an electric motor.

A left hand is held as shown in this illustration, with the three pointing digits assigned to the direction of mechanical force, magnetic field and electric current. The memory aid works as follows:

  • Thumb = Thrust (movement)
  • Forefinger = Magnetic Field (north to south)
  • Centre finger = Current (positive to negative)

You may come across variants of the above system, but we believe this is the simplest to remember.

For all electric motor enquiries, including sales, upgrades, customisation and repairs, give us a call on 01621 868138 or email info@gibbonsgroup.co.uk

Electric Motors

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