What is flux per pole in DC machine?
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What is flux per pole in DC machine?
Explanation: Flux is defined as flux density for a given surface area. Here, Surface area can be calculated and multiplied with B to give the value of flux. Flux= 2πr*l*B. now, for calculating flux per pole, divide it by P=4.
When flux in the machine is decreased its speed increases?
1 Answer. The instant flux is reduced, the back emf reduces and this causes the armature to increase current. More current means a higher driving torque and this accelerates the armature to run at a higher speed until the speed equation is in balance again.
Why is flux inversely proportional?
The total number of flux lines depends on the strength of the light source and is constant with increasing distance, where a greater density of flux lines (lines per unit area) means a stronger energy field. Thus the field intensity is inversely proportional to the square of the distance from the source.
How do you calculate flux per pole in dc generator?
EMF equation of a DC generator
- Average emf generated per conductor is given by dΦ/dt (Volts) eq.
- Flux cut by one conductor in one revolution = dΦ = PΦ …. (Weber),
- Number of revolutions per second (speed in RPS) = N/60.
- Therefore, time for one revolution = dt = 60/N (Seconds)
- From eq.
Does flux increase with speed?
E is proportional to speed and flux. So if V and IaRa are constant, then Speed and Flux are inversely proportional.
When the load increases the speed decreases in DC shunt motor This is due to?
As the load increases, to maintain the voltage at a constant value, current decreases, due to which the strength of magnetic field produced by the Internal winding of DC motor decreases. This results in a decreased interaction of the two magnetic fields and thus decrease in speed of motor.
What is the relationship between flux and speed of the DC shunt motor?
1. Flux control method. It is already explained above that the speed of a dc motor is inversely proportional to the flux per pole. Thus by decreasing the flux, speed can be increased and vice versa.