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Entry type: FAQ Entry ID: 60605536, Entry date: 05/16/2012

Defining the direction of motor rotation

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How is the direction of rotation of a motor defined?




In accordance with DIN EN 60034-8, the direction of rotation of a motor is defined as follows:


  • The direction of rotation is the direction viewed from the drive end.

  • The drive end is the side with the shaft extension.
  • For machines with two shaft extensions, the drive end is:

        a) the end with the bigger shaft diameter

        b) the end on the opposite side to the fan, if both

            shaft extensions have the same diameter.




Motors with clockwise rotation turn the shaft clockwise
when viewed from the drive end (viewing direction from drive end to non-drive end).






Motors with counter-clockwise rotation turn the shaft in a counter-clockwise direction when viewed from the drive end (viewing direction from drive end to non-drive end).



As the direction of rotation for the motor and driven machine is defined with reference to the respective shaft extension, the motor requires the opposite direction of rotation to that of the driven machine.


That is to say, a counter-clockwise driven machine requires a clockwise-rotating motor and a clockwise driven machine requires a counter-clockwise-rotating motor.


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