Electric motors asynchronous or regularly known as induction motors depict most of the effective electric motors on the market.
These motors have a short-circuit rotor, ie consisting of aluminum bars that are installed in the groove cores of the magnetic plate and at the ends are connected to each other by means of a ring (short-circuit ring).
Due to this fact, the variable magnetic field generated in the stator induces sinusoidal currents in the bars of the rotor cage, which in turn develops a magnetic field in the rotor that opposes the field of the stator. They may also hold a coiled rotor, which is the least-applied solution.
As the poles, with the same polarity repel each other, there is a force arising in the direction of rotation of the rotor. This rotates with a slightly reduced speed at the sync speed. Due to this peculiarity, these types of motors are able to depart directly from the network, without the cooperation of any other motor or even power electronics instruments.
An important topic of this model of engines is the inequality between the speed of synchronism and the speed rotor, called sliding or slipping.