Working Principle Three Phase Induction Motorįor explaining the principle of operation of a three-phase induction motor, consider a portion of the three-phase induction motor as shown in the figure. The winding placed in these slots (called rotor winding) may be one of the following two types: The rotor, mounted on a shaft, is a hollow laminated core having slots on its outer periphery. This rotating field induces currents in the rotor by electromagnetic induction. When 3-phase supply is given to the stator winding, a rotating magnetic field of constant magnitude is produced. Greater the number of poles, lesser is the speed of the motor and vice-versa.
The 3-phase stator winding is wound for a definite number of poles as per the requirement of speed. Outer frame and stator of three-phase induction motor The stator consists of a steel frame that encloses a hollow, cylindrical core made up of thin laminations of silicon steel to reduce hysteresis and eddy current losses.Ī number of evenly spaced slots are provided on the inner periphery of the laminations. The insulated conductors are connected to form a balanced 3-phase star or delta connected circuit. The rotor is separated from the stator by a small air-gap which ranges from 0.4 mm to 4 mm, depending on the power of the motor. The rotor winding derives its voltage and power from the externally energized stator winding through electromagnetic induction and hence the name.Ī 3-phase induction motor has two main parts Only the stator winding is fed from the 3-phase supply. The stator carries a 3-phase winding (called stator winding) while the rotor carries a short-circuited winding (called rotor winding). Like any electric motor, a 3-phase induction motor has a stator and a rotor. Video: Three Phase Induction Motor WorkingĬonstruction of Three Phase Induction Motor.Working Principle Three Phase Induction Motor.Construction of Three Phase Induction Motor.
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