Table of Contents
- 1 What is meant by flux per pole?
- 2 What is the unit of flux per pole?
- 3 How do you calculate flux per pole in dc generator?
- 4 What is the formula of induced emf?
- 5 What is the formula for frequency of flux reversals?
- 6 What is the formula to reduce flux pulsations?
- 7 What is the flux per pole?
- 8 What is the formula for electric flux?
What is meant by flux per pole?
The flux per pole is the ratio between the airgap magnetic flux density between the rotor and the stator to the total area of cross section of the magnet on that pole alone.
What is the unit of flux per pole?
The SI unit of magnetic flux is the weber (Wb; in derived units, volt–seconds), and the CGS unit is the maxwell. Magnetic flux is usually measured with a fluxmeter, which contains measuring coils and electronics, that evaluates the change of voltage in the measuring coils to calculate the measurement of magnetic flux.
What is the formula for flux per pole Mcq?
Flux in the pole body = 1.2 * 10 = 12 weber.
What is the relationship between back emf speed of rotation and flux per pole?
Thus, it is clear that the induced emf is directly proportional to the speed and flux per pole. The polarity of induced emf depends upon the direction of the magnetic field and the direction of rotation.
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.
What is the formula of induced emf?
Faraday’s law states: Induced EMF is equal to the rate of change of magnetic flux. Magnetic flux = Magnetic field strength x Area = BA. Therefore…Induced EMF = (change in Magnetic Flux Density x Area)/change in Time. Therefore, Induced EMF = (Bπr2n)/t.
What is flux in chemistry?
Flux is a chemical purifying agent, flowing agent or cleaning agent. Most commonly, it is used in metal joining and metallurgy. Some examples of flux include: Ammonium chloride. Zinc chloride.
How do you calculate flux?
Know the formula for electric flux.
- The Electric Flux through a surface A is equal to the dot product of the electric field and area vectors E and A.
- The dot product of two vectors is equal to the product of their respective magnitudes multiplied by the cosine of the angle between them.
What is the formula for frequency of flux reversals?
3.3 Slot-pole combinations
| Zs | Zr | 8 |
|---|---|---|
| 12 | P | 2 |
| SPP | 1 | |
| PR | 4 | |
| kwn | 0.5 |
What is the formula to reduce flux pulsations?
What is the formula to reduce flux pulsations? Explanation: First the number of armature slots is calculated. Then the ratio of the number of armature slots to the number of poles is approximately equal to integer+-0.5. 10.
What is the relationship between speed back emf and flux?
We know, back emf Eb of a DC motor is the induced emf in the armature conductors due to the rotation of armature in magnetic field. This shows the speed of a dc motor is directly proportional to the back emf and inversely proportional to the fluxper pole.
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.
What is the flux per pole?
The flux per pole is the ratio between the airgap magnetic flux density between the rotor and the stator to the total area of cross section of the magnet on that pole alone. Since the no. of poles is consider in the emf equation, the only flux acting between the magnet and the rotor armature is alone considered. Related QuestionsMore Answers Below.
What is the formula for electric flux?
Electric Flux Formula. The total number of electric field lines passing a given area in a unit time is defined as the electric flux. Similar to the example above, if the plane is normal to the flow of the electric field, the total flux is given as: (phi _{p}=EA)
What is the difference between magnetic flux and current?
Change in the number of field lines through a coil gives a current. Number of field lines through a coil is called magnetic flux. When a loop is moved parallel to a uniform magnetic field, there is no change in the number of field lines passing through the loop and no induced current.
What are the factors affecting the electric flux through an element?
The electric flux through an area of element is given by the formula: Φ=EAcosθ From the formula, we see that electric flux depends on the following factors: 1 Electric field through the area 2 Surface area of the area element 3 Angle of inclination between the field and normal to the area element