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Calculating Electric Motor Power in KW: Torque (NM) & RPM Formula (HP = Torque x RPM / 9549)

Brodowski 69115 8
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  • #1 4421179
    Brodowski
    Level 11  
    Hello, how to calculate the power of an electric motor given its torque and revolutions per minute? I found such a formula, is it correct?
    Quote:
    horsepower* = (torque** x revolutions per minute) / 9549
    * power expressed in kilowatts (KW)
    ** torque expressed in newton meters (NM)
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  • Helpful post
    #2 4421487
    fuutro
    Level 43  
    The pattern is correct.
    P=(M*n)/9550, where P-power [kW], M-rated torque [Nm] and n- rotational speed [rpm].
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    #3 4421541
    waldec
    Level 19  
    Hello. I'm not sure about your pattern. I know one
    N (power in hp)=M(torque in kGm)* n(rotation speed rpm)/716.2
    1KM=0.733kW, 1kGm=9.8068Nm(newton meter)
    Regards Waldek
  • #4 4421572
    fuutro
    Level 43  
    Both designs have the same design just different units. They'd probably match up.
  • #5 6317894
    kamiljozwiak
    Level 1  
    Hello and welcome
    Will refresh the topic a bit.
    I have the turnover.
    The dimensions of the item I want to drive, but I'm having trouble calculating the Torque. Ai and I have a given productivity t/hour.
    Regards
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  • #6 6560924
    Alojzy Bąbka
    Level 11  
    and if I have a 500 nm motor, how many kw is it?
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  • #7 6561000
    fuutro
    Level 43  
    The nm unit is a nanometer, which is 10E-9 meters. Performance alone is worth nothing without the characteristics of the driven device and load. This will help but will not give accurate results. Can you just measure the active and apparent power consumption? This will help you get approximate parameters.
  • #8 9357720
    ak47rp
    Level 1  
    What is the torque of a 12V/3A, 6000 rpm electric motor?
  • #9 9357742
    fuutro
    Level 43  
    Due to the fact that you haven't written anything about it at all, and the parameters show what type (I'm betting on the commutator, but nothing more), I would say with some error that around 0.05-0.055Nm, but I won't give my head - I assume that you gave the nominal parameters from the plate. If you dug up the type, maybe the manufacturer and through him he found the data.
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Topic summary

The discussion centers on calculating the power of an electric motor using torque and RPM. The formula presented by the user, HP = Torque x RPM / 9549, is confirmed to be correct, with variations noted such as P = (M x n) / 9550 for power in kW, where M is torque in Nm and n is RPM. Another participant mentions a different formula for horsepower, N = M (in kGm) x n (in RPM) / 716.2, and provides conversions between units. The conversation also touches on the importance of knowing the characteristics of the driven device for accurate calculations and raises questions about specific motor parameters, such as torque for a 12V/3A, 6000 RPM motor.
Summary generated by the language model.
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