Table of Contents
Why flux in air gap is useful flux?
In this circuit, there is only one path for the magnetic circuit and thus it can be called as a series magnetic circuit. One of main reasons for an Air Gap is to increase the reluctance of the magnetic circuit. Also, the air gaps help the magnetic flux to expand outside the magnetic circuit.
What is effect of air gap in induction motor?
If the air gap of an induction motor increases, 1) The permeability of the magnetic circuit rotor-to-stator will decrease. 2) The magnetizing inductance of the motor thus decreases. 3) The magnetizing current will increase; This will cause a poor power factor at all loads.
What is the use of air gap in magnetic circuit?
Air gap is non-magnetic part of a magnetic circuit. It increases the value of magnetizing current and lowers the achievable flux density. Thus it prevents the saturation of the magnetic circuit.
What is the effect of increasing air gap length in an induction motor?
If the air gap length is increased, the reluctance of the magnetic circuit will increase. This increase in the reluctance will demand more magneto-motive force to produce the required flux in the motor. To meet the additional requirement of MMF, the stator magnetizing current increases.
What is the impact of having an air gap in the magnetic core for an inductor?
Air gaps are an integral part of gapped inductors. The gap reduces effective permeability of a given magnetic circuit and allows storing much greater energy before saturation is reached. Increasing the gap reduces the inductance, so the winding must have more turns to compensate accordingly.
Where are air gaps required?
Most plumbing codes require an air gap on the RO drain line to prevent the possibility of contamination. Since RO systems must dispense water through their own faucet, many opt for an air gap faucet that incorporates the air gap inside the body of the faucet itself.
What is the air gap in an electric 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 does the size of the air gap affect the current?
Increasing the air gap’s size increases the magnetizing current, which represents the amount of current needed to drive the magnetic flux through the air gap. The greater the number of poles on the motor or generator, the greater the number of times the flux must cross the air gap for each revolution.
What is the purpose of the air gap in an alternator?
The air gap generally is non-uniform and the pole shoes are so designed to have an almost sinusoidal space distribution of flux. Except salient pole alternator and reluctance motor air gap serves one and only one purpose that is feeding magnetic flux to rotor without friction.
What is the air gap size and uniformity?
Air gap size and uniformity is bigger issue with large motors and large motor repair . Electric motor air gaps can have a tremendous affect on motor performance, whether the gap is too big or too small even more complications arise when the air gap is eccentric. And to make matters worse, it can be an even bigger problem for large motors.