Bezpośredni rozruch zmniejsza trwałość silników klatkowych dużej mocy

Industrial AC cage rotor motors of nominal voltage 6000 and 10 000V are usually started by switching direct on line. Many failures of the motors is often the result of their design which do not take into account the thermal and mechanical stresses caused by initial starting current surges in stator and rotor (squirrel cage) windings, as well as electro-dynamic vibrations occurred at starting period. Proper choice and proper design of the rotor cage is of high importance for d.o.l. started induction motors of middle and high capacity. In the paper thermal and dynamic effects of starting current of d.o.l. started motors are evaluated, same examples of typical disintegrated squirrel cages showed and recommendations for motor’s exploitation given.