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Calculating the permissible output power can be based on the number of starts per hour, the moment of inertia of the load, and the speed of the load. Mechanical stresses may also impose a limit below that of thermal factors. m Permitted output power P = PN √ 1-m o PN = rated output of motor in continuous duty J + J'L m=x. e. multiplied by (load speed/motor speed)2. The moment of inertia J (kgm2) is equal to 1/4 GD2 in kpm2. m o= highest permitted number of starts per hour for motor at no load, as stated in the table at right.

Maximum starting times (seconds) for occasional starting 53 4. 2 Starting time Permitted frequency of starting and reversing When a motor is subjected to frequent starting, it cannot be loaded at its rated output due to the thermal starting losses in the windings. Calculating the permissible output power can be based on the number of starts per hour, the moment of inertia of the load, and the speed of the load. Mechanical stresses may also impose a limit below that of thermal factors. m Permitted output power P = PN √ 1-m o PN = rated output of motor in continuous duty J + J'L m=x.

In the absence of any indication of the rated duty type, continuous running duty is assumed when considering motor operation. S1 Continuous running duty Operation at constant load of sufficient duration for thermal equilibrium to be reached. Designation S1. S2 Short-time duty Operation at constant load during a given time, less than that required to reach thermal equilibrium, followed by a rest and de-energized period of sufficient duration to allow motor temperature to return to the ambient, or cooling temperature.

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Abb The Motor Guide Gb


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