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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.
The table below illustrates typical values for part load. For instance, a motor with an efficiency value 90 has a 3/4 load value of 90, a 1/2 load value of 89 and a 1/4 value of 85. ABB can supply guaranteed part load values on request. 66 4. 7 Power factor A motor consumes both active power, which it converts into mechanical work, and also reactive power, which is needed for magnetization but does not perform any work. The active and reactive power, represented in the diagram (below) by P and Q, together give the apparent power S.
When starting from cold, these can be doubled. 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.