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How do you determine the flux constant of a PMSM?
Flux linkage is determined by magnets. The constant flux (Wb) per pole pairs induced in the stator windings of the magnets. Flux established by the permanent magnets produce three trapezoidal back EMP waveforms.
When pole flux of dc motor is zero what is its speed?
when the pole flux is zero there is no induced emf in the armature conductor of dc machine as a result of this there is no back emf for controlling action so speed become dangerously high or we can say it will be infinite.
What are the characteristics of a magnetic flux?
all magnets have a north and south pole. opposite poles attract, like poles repel.
In a dc generator why does total flux per pole decrase if the load on the machine increases even thought the field current is constsn?
Due to armature reaction
Difference between flux linkage and flux leakage?
i) leakage flux is those flux which goes through the air and linkage flux is those flux whose go through the cell. ii)leakage flux is the loss at flux but linkage flu is warning flux. iii)leakage flux is cause of eddy current loss and linkage flux is case of copper loss.
Why is the pole shoe extended beyond the pole core?
air is big hinderance for flux, so pole shoe used to spread the flux uniformly.
What is pole-shoe?
The field magnet consist pole shoes. The pole shoes spread out the flux in the air gap and supports the exciting coil.
Where in a bar magnetic is the magnetic flux the strongest?
The magnetic flux of a magnet is strongest in its poles. There poles of a magnet are those points where the magnetic lines of force emanate and enter. The poles are termed as north and south. The north pole is also called the N-pole or the north-seeking pole. Consequently, the south pole may also be referred to as the S-pole or the south-seeking pole.
How do you determine the flux constant of a PMSM?
Flux linkage is determined by magnets. The constant flux (Wb) per pole pairs induced in the stator windings of the magnets. Flux established by the permanent magnets produce three trapezoidal back EMP waveforms.
When pole flux of dc motor is zero what is its speed?
when the pole flux is zero there is no induced emf in the armature conductor of dc machine as a result of this there is no back emf for controlling action so speed become dangerously high or we can say it will be infinite.
Why pole shoes are laminated in a dc machine?
they are used to protect windings to get down and spread the flux uniformly.
How would you Explain magnetic pole strength?
Magnet has two poles. The Pole strength depends on flux that emanate from it. The pole strength is measured in Amp-m. If we know magnetic moment the pole strength can be calculated as magneticmoment/length of magnet
Is the south pole of a magnet stronger than the north pole?
Not if the magnet is symmetrical, and you define 'strength' in terms of flux density.Yes because it has a stronger attraction rate.there is no stronger or weaker for a magnet
What are the characteristics of a magnetic flux?
all magnets have a north and south pole. opposite poles attract, like poles repel.
Working principal of shaded pole motor?
when alternating current flows in the field winding, an alternating flux is produced in the field core.A portion of this flux links with the shading coil,which behaves as a short circuit secondary of a transformer.A voltage is induced in the shading coil, and this voltage circulates a current in it.The induced current produces a flux called the induced flux which opposes the main core flux.The shading coil thus causes a flux in the shaded portion to lag behind the flux in unshaded portion of the pole.At the same time the main flux and shaded pole flux displaced in space.This space displacement is less than 90 degree.Since there is time and space displacement between two fluxes,the conditions for setting up a rotating magnetic field is produced.Under the action of the rotating flux a starting torque is developed on the cage rotor.The direction of this flux is from unshaded to shaded portion of the pole.and the rotor moves in clockwise direction
Explain the principle of a alternating current generator?
Well, a magnetic will be spun with one pole up and then the other pole up inducing a magnetic flux, and a coil of copper will be encompassing the magnetic and every time the magnet flips its poles around, thus inducing magnetic flux, a small bit of current will be made. When the flipping of the magnet is faster the current comes faster, but alternates with the flipping of the magnetic, or the changing of the magnetic flux.
How can you isolate the magnetic flux from big magnets that are used for turning a motor shaft?
You shouldn't need to. Except for minor fringing, the majority of the flux will remain within the magnetic circuit -i.e. the yoke, pole pieces, etc.
