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IEVref: | 113-01-42 | ID: | |

Language: | en | Status: Standard | |

Term: | rotational frequency | ||

Synonym1: | speed of rotation [Preferred] | ||

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Symbol: | n
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Definition: | magnitude of the angular velocity divided by the angle 2π, thus ωn = ||/2πωNOTE 1 The rotational frequency is also the derivative of the absolute value of angle of rotation NOTE 2 The coherent SI unit of rotational frequency is second to the power minus one, s | ||

Publication date: | 2011-04 | ||

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Internal notes: | 2017-06-02: Cleanup - Remove Attached Image 113-01-42en.gif 2017-06-02: Cleanup - Remove Attached Image 113-01-421en.gif 2017-06-02: Cleanup - Remove Attached Image 113-01-422en.gif | ||

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NOTE 1 The rotational frequency is also the derivative of the absolute value of angle of rotation *φ* with respect to time *t*, divided by 2π, thus $n=\frac{1}{2\pi}\frac{\text{d}\left|\phi \right|}{\text{d}t}$.

NOTE 2 The coherent SI unit of rotational frequency is second to the power minus one, s^{–1}. The units revolution per second, symbol r/s, and revolution per minute, symbol r/min, are widely used in specifications for rotating machines.