How to find Magnetic flux density application?

Question

A magnetic field exists around a conductor of electrical current. The magnetic field is called a magnetizing force (H), and it can be concentrated by winding the conductor into loops. Current is measured in amperes, and the magnetizing force is measured in ampere-turns.

Substances placed near a magnetizing force are affected by it, and the substances take on magnetic properties. The amount of magnetism induced into a body by a magnetizing force (H) is called flux density (B). The intensity of the flux density (B) is affected by the intensity of the magnetizing force (H), the qualities of the substance, and by the intervening media between the systems.

Answer 1

In oilfield,

To rotate the pipe and drill we use the electric power to drive the hydraulics fluid to turn the motor. The torque power applied, reads from the amount of magnet flux generated from the electric current.

By simply put a magnetic sensor at the cable, work it around to get the amount of torque applied.

Answer 2

Common equations:

flux density (B) = magnetic field strength (H) * permeability(intervening media)

flux density = magnetic flux / area

charge mobility = 1 / B

i think the above equation will help you to find the magnetic flux...

Remember the unit conversion too

Units

gauss

Telsa ( One Telsa = 10,000 gauss)

gamma (One gamma = 10^-9 Tesla)

Maxwells per cm^2

webers per cm^2

lines per inch^2

Answer 3

I'm not 100% sure what you're asking from your question, but based on the previous answers, I'll throw this one out as well:

Ferromagnetic objects such as pipes, wire rope, sheet steel, etc., are inspected for defects using magnetic flux. The object to be inspected is magnetized using either an electromagnet or permanent magnet. The flux density imparted to the object is typically in the neighborhood of 1.5 tesla or higher. In other words, the object is pushed to near magnetic saturation.

As long as the object is in good condition, most of the flux will be confined to the object. The flux in the area surrounding the object will flow parallel to the surface of the object (assuming no sharp corners). On the other hand, if a defect exists in the object, the flux density near the defect will increase, which decreases the objects permeability and cause substantially more of the flux to move from the object to the area surrounding the object, a phenomenon called "flux leakage".

The flux that diverts around the defect also no longer runs parallel with the object. The flux leakage can be detected with sensors. Typically, the sensors are either coils or Hall sensors. Based on a relationship with the measured flux leakage, the size of the defect can be determined.

I hope this is the sort of application you were looking for.