Basic Induction Motor Concepts
Basic Induction Motor Concepts
The Development of Induced Torque in an Induction Motor
When current flows in the stator, it will produce a magnetic field
in stator as such that Bs (stator magnetic
Field) will rotate at a speed:
N sync =(120 Fe)/( P)
Where Fe is the system frequency in hertz and P is the number of poles in
the machine. This rotating
Magnetic field Bs passes over the rotor bars and induces a voltage in them. The
voltage induced in the
Rotor is given by:
e ind = (v x B) l
Hence there will be rotor current flow which would be lagging due
to the fact that the rotor has an
Inductive element. In addition, this rotor current will produce a
magnetic field at the rotor, Br. Hence the
Interaction between both magnetic field would give torque:
t ind = k BR ´ BS
The torque induced would generate acceleration to the rotor, hence
the rotor will spin.
However, there is a finite upper limit to the motor’s speed.
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