Introduction: Basic function of a electric motor


Every electric motor get the resulting torque from two magnets that affect each other. Ones of this magnet is fixed and is called stator. The other one can rotate in the area of the magnetic field of the stator and is called rotor. The realisation of this magnet can be (1) constant magnets or (2) magnetic field generated with coils.

(*) Stator = stator
(*) Mag.Feld = magnetic field
(*) Rotor = rotor
(*) Magnet = magnet


Due to the attract ional forces of different poles of magnets or repulsive forces of the same poles of magnets there will be produced a torque that can produce speed.

The magnetic field in the stator has to rotate but the magnets are in standstill. The rotor has to rotate but the magnetic field can be constant in standstill.

The rotor stick on the rotating magnetic field of the stator.

The main task of the control of the motor is to generate the rotating magnetic field of the stator and synchronise this to the rotor and the current load.

The most time in past the 50Hz sine from the socket was the main frequency for the rotating magnetic field.