Grid Tech

 Nowadays about 70% of all electricity in industry is used for providing electromotive force by driving electric motor. The beginning of development in electric motor is originated from discovery of Electromagnetic Induction by Michael Faraday. Fig 1. Classification of Motor Motor is largely categorized by 2 parts : AC motor and DC motor. In fact, between these two types, there is also Brushless DC motor(BLDCM). It cannot be considered as a typical motor but we will figure it out later, not now.  DC motor is divided into 2 types : Separatly Excited and Self Excited. It depends on how it makes Excitation power in order to generate magnetic flux in field coil of a stator.  AC motor is also divided into 2 types : Synchronous motor and Induction motor. It is not presented in diagram but Synchronous motor can be divided by 3 types : Permanent magnet, Wound Field and Reluctance. And in Permanent magnet. we use semiconductor, which is so important. So we will figure

0. Induction Motor   The induction motor is invented by the scientist Nikola Tesla and it is the most common motor type even today (Around 90%). About 50% of global electric power consumption is due to induction motors. The induction motor has basically two main parts: Stator and Rotor. 1) Stator: Stationary Part The stator is the stationary part of an induction motor like Fig 1-2. It is made up of various stampings with slots to carry 3 phase windings. The windings are geometrically divided 120 degrees separated. It does not require DC current to run the machine. 1. Induction Motor 2) Rotor: Rotating Part 2. :Various Rotors   The rotor is the rotating part of the induction motor. The rotor is simply a collection of conducting bars short-circuited by end rings. Its rotation is because of the interaction between the windings and magnetic fields producing a torque around the rotor's axis. There are many kinds of rotors: Squirrel-cage rotor, Wou