What will happen to the total flux if the air gap is increased?
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What will happen to the total flux if the air gap is increased?
As we increase the air gap, it increases flux fringing and vice versa.
What happens if the air gap length of induction motor is doubled?
What happens if the air gap length is doubled? If the air gap of an induction motor is doubled then the mmf and magnetizing current approximately doubles. Also increase in air gap length increases the overload capacity, offers better cooling, reduces noise and reduces unbalanced magnetic pull.
What is the effect of air gap on the equivalent circuit of an induction motor?
A large air-gap leads to higher magnetizing current (and poor power factor). Indeed, the more you increase the air gap, the less “usefull magnetic interaction” you have between the rotor and the stator.
What is the impact of increasing the air gap in an induction motor Mcq?
The magnetic flux in the air gap will decrease and leakage flux will increase. This will cause the reduction in the maximum available torque. The magnetizing current will increase. This will cause a poor power factor.
What is the importance of air gap in induction motor?
The air gap refers to an actual physical gap in an electric motor that separates the moving rotor and the stator core. This gap is a necessary part of motor design and the size of the air gap is one of the keys to motor performance and reliability.
How can flux leakage be reduced?
Additional Information
- By reducing the magnetizing current to the minimum.
- By reducing the reluctance of the iron core to the minimum.
- By reducing the number of primary and secondary turn to the minimum.
- By sectionalizing and interleaving the primary and secondary windings.
How can leakage flux be reduced?
The various methods used for reducing leakage flux are:
- By Increasing Height of Window :
- By Arranging Primary and Secondary Windings Concentrically :
- By Sandwiching Primary and Secondary Windings:
- By Adopting Shell Type Construction:
What is length of air gap in induction motor?
The stator slot pitch at the air gap surface should be between 1.5 to 2.5 cm.
What happens when induction motor runs above synchronous speed?
The stator winding of an ac machine produces a rotating mmf which rotates at synchronous speed: The rotor must rotate at speeds other than synchronous speed for torque to be produced. If an external mechanical system drives the rotor above synchronous speed, the induction machine acts as a generator.
What happens if harmonic is given to induction motor?
These harmonics is applied to induction motor, it will fail to start because rotating magnetic field never develops. Hence it results in fail to start.