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Looking for Definition of Rotor WR^2 | Eng-Tips Wk2 is a particular “simplified” constant for moment of inertia It has “weight” instead of “mass” and it is used on the expression: t = Wk2 (rpmf - rpmi) (308*Tavg)] t = accelerating time in seconds rpmf = final rotating speed in revolutions per minute rpmi = initial rotating speed in revolutions per minute (normally zero at stand
Motor load inertia | Eng-Tips I have been searching but have been unsucessful in finding out how a load inerita relates to a certain motor hp For instance if I have a 300hp 4160V motor is there a table of formula that relates this hp to the maxiumum load inertia that this motor can handle? I have a motor that I am RVAT
Calculating start stop time for induction motor | Eng-Tips The distinction between these two inertia equations, WR2 and WK2, is important because in AC induction motor applications, inertia is used to determine the motor torque required to achieve a desired speed within a given time
(WK^2) Weight Moment of Inertia? | Eng-Tips Trying to figure out the minimum HP required to accelerate a fan (blower) wheel Nema publishes the Load Wk^2 values for motors at different RPM HP I have modelled the fan wheels in cad and have the inertial properties ie mass moment of inertia in the axis of rotation (Iz) Is this the
Motor inertia information | Eng-Tips Please can you point me to information on how to estimate the inertia of a motor from its power, speed, etc, and to tables of data for the same? Thanks
torque and power calculation - Electric motors generators . . . - Eng-Tips Maybe, but the amount of torque needed to accelerate in 1 second is very different than the amount of torque required to acceleraqte in 1 minute t = WK 2 x rpm 308 x T av T = WK 2 x rpm 308 x t WK2 = inertia in lb ft 2 t = accelerating time in sec T = Av accelerating torque lb ft Inertia reflected to motor = Load Inertia * (Motor rpm Load rpm) 2 "Dear future generations: Please accept
Acceleration time | Eng-Tips Hello All I have bit of a problem I have two torque speed curves, one showing the motor torque the other load torque But I need to find the Acceleration time; I have the true torque values along each line in n-m and the speed in rad s In addition I have the kW rating of the motor But I do
Motor gearbox for turntable application | Eng-Tips For applications like these, the load inertia (referred to as WK2) must also be considered These inertia loads invariably use more power to start and accelerate to running speed, than they do to keep running at full speed The torque to accelerate load inertia (WK2) may be calculated from: Torqueinertia =u0001 WK2 x RPM 308 x time where:
VFD operation on high inertia loads | Eng-Tips So the Wk2 at the motor is (300 * 1 5 * 308 * 420) 1800 = 32340 #ft^2 Which is a WK2 equivalent to about 80 inch roll of paper 12 Ft wide, considerable indeed
Inertia Constant - Generator | Eng-Tips How would you suggest finding a J or WK2 value from a freq vs time chart? You know the angular acceleration You could assume the output power of the prime mover at the time of the load rejection gets used to accelerate the inertia of the system instead At the operating rpm this power corresponds to a certain torque