Method of starting motors by harmonics and electrical motors started by this method

A method of starting motors with the aid of changing the connection of a stator winding and a rotor winding of the motor, comprising the steps of:

• connecting the stator winding to produce very strong harmonic magnetic fields by the stator winding when starting said motor, said very strong harmonic magnetic fields being used as starting harmonics;
• connecting a plurality of resistance elements firmly with the rotor winding;
• inducing currents in the rotor by said starting harmonics to flow through said resistance elements;
• inducing current in the rotor by working magnetic fields of said stator winding so that the current not to flow freely through said resistance elements wherein the starting torque increases and the starting current decreases as a result of the combined effect of the starting harmonics produced by said stator winding and said resistance elements on the rotor;
• running up the rotor of the motor so that the speed of the motor nearly reaches its rated value;
• and
• reconnecting the stator winding of said motor according to a normal connection so as to eliminate said starting harmonics, wherein said motor is running normally due to the effect of the working magnetic fields, and the current in the rotor flow only through a part of the rotor winding and not said resistance elements.