Relationship to determine the lifting capacity of an electromagnet

[oragami]

Homework Statement

To determine a formula that can be used to determine the lifting capacity of an electromagnet/magnet through a known air gap.

Homework Equations

Weight= (magnetomotive force)/reluctance

The Attempt at a Solution

From the experiment the following general observations were made with respect to the lifting capacity of the electromagnet.

Lifting strength increased as # of turns doubled, current doubled and size of core doubled, however decreased as air gap increased.

By using the equation:

Effect= Cause/Opposition

Where the desired effect is to overcome the object weight
the cause is the magnetic force produced by the magnet
the resistance to the magnetic flux due the the air gap.

Weight= (magnetomotive force)/reluctance

Weight= BlIsinθ/(l/μA)

 

[NateD]

Where B is the magnetic field strength, l is the length of the air gap, μ is the relative permeability, A is the area of the air gap and θ is the angle between the magnetomotive force and the air gap.The formula can be used to determine the lifting capacity of an electromagnet/magnet through a known air gap.