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Derivation of Electric Motor Torque formula

  • 18-12-2015 10:27am
    #1
    Calahonda52
    Registered Users, Registered Users 2 Posts: 12,873 ✭✭✭✭


    Am looking at VFDs and VSD's etc for industrial electric motors and came across this for torque in the engineering toolbox website

    "Torque can be calculated in SI units as

    T = Power (in watts)*9.554 / n

    where

    T = torque (N.m)

    n = revolution per minute (rpm)

    Any body know where the 9.554 comes from? "

    wiki
    https://en.wikipedia.org/wiki/Torque#Machine_torque
    has

    In the following formulas, P is power, τ is torque and ω is rotational speed.
    P= τ (N.m) *2Pi (rad/rev)* ω (rev/sec)

    Thanks as always

    “I can’t pay my staff or mortgage with instagram likes”.



Comments

  • #2
    DublinDilbert
    Registered Users, Registered Users 2 Posts: 5,401 ✭✭✭DublinDilbert


    9.554 is 60 / (2 x 3.14)

    So the 60 comes from the conversion from revs per sec to per minute.


  • #3
    Calahonda52
    Registered Users, Registered Users 2 Posts: 12,873 ✭✭✭✭Calahonda52


    DublinDilbert wrote: »
    9.554 is 60 / (2 x 3.14)

    So the 60 comes from the conversion from revs per sec to per minute.

    Much obliged

    “I can’t pay my staff or mortgage with instagram likes”.



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