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Power Transmission Knowledge Menu
Motor Generator Set Distributor
Steady-state torque (Ts) The torque used to select couplings should
be based upon the following equations:
In SI units:

In inch (imperial) units:
Where:
TS = steady state torque used to select the coupling (SI,
newton-meters; U.S., inch-pounds)
Pnormal = input power required by the driven machine at the
specified normal operating point (SI, kilowatts; U.S.,
horsepower)
Nnormal = speed corresponding to the normal power (in revolutions
per minute)
S.F. = service factor
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