An electric machine has as main function to transform electrical energy into mechanical energy. This machine is mainly composed of the stator and the rotor, the first being the static part and the second the moving part. Also called an electric motor, this machine operates according to the principles of electromagnetism, that is, through an electromagnetic field created by the voltage applied to the windings of the stator, causing motion by magnetism in the rotor.
It is necessary to understand the various tests and calculations made to better know the operation and characteristics of this electric machine and with this we intend to study first the operation of a three phase induction motor. reelcraft S601021-30 This type of electric motor is a two-speed squirrel cage rotor motor. The speed of the motor will depend on the connection of the motor. The operating principle for the change of speeds in the motor under study is the switching of one pair of poles (2p = 2) to 2 (2p = 4), thus obtaining synchronism speeds of 3000rpm and 1500rpm respectively. Starting from the approximate equivalent circuit of the asynchronous three-phase machine, we will calculate the values of the circuit for the motor under study by means of tests in vacuum, locked rotor and in load.