Magnetic strength over distance

In summary, the conversation discusses the possibility of calculating the force exerted by an electromagnet on a small motor from a distance of about a foot. It is suggested that this can be done numerically or analytically by knowing the distribution of the magnetic field. Additionally, it is mentioned that finite element software can also be used for more complex calculations.
  • #1
magneto123
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I am working on an engineering project in which I am mounting an electromagnet onto a small RC robot. The link for the electromagnet is here http://www.mpimagnet.com/catalog.asp?prodid=670540&showprevnext=1
I was wondering if there was any way to calculate the force exerted by the magnet on a small motor from a distance of about a foot. Any ideas?
 
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  • #2
magneto123 said:
I am working on an engineering project in which I am mounting an electromagnet onto a small RC robot. The link for the electromagnet is here http://www.mpimagnet.com/catalog.asp?prodid=670540&showprevnext=1
I was wondering if there was any way to calculate the force exerted by the magnet on a small motor from a distance of about a foot. Any ideas?

Yes, it's possible numerically ( in some cases analytically too). You need to know the distribution of magnetic field first. Calculating the total force applied on a body surrounded by air, in a magnetic field , is surprisingly simple even when the object has a complicated shape.
see http://www.fieldp.com/documents/stresstensor.pdf

Calculating local forces and torques are a little more challenging. You need to use a finite element software for such calculations. Calculation of the force is often one of the features of a finite element software.
 

FAQ: Magnetic strength over distance

What is magnetic strength over distance?

Magnetic strength over distance refers to the decrease in the strength of a magnetic field as the distance from the source increases. It is also known as magnetic field strength or magnetic flux density.

How is magnetic strength over distance measured?

Magnetic strength over distance is measured using a device called a magnetometer. This instrument can detect and measure the strength of a magnetic field at a specific distance from the source.

What factors affect magnetic strength over distance?

The strength of a magnetic field decreases with distance due to the inverse square law, which states that the strength of a force is inversely proportional to the square of the distance from the source. Other factors that can affect magnetic strength over distance include the size and shape of the magnet, as well as any intervening materials or magnetic fields.

How does distance impact the strength of electromagnets?

The strength of an electromagnet also follows the inverse square law, so the magnetic field will decrease as the distance from the electromagnet increases. However, the strength of an electromagnet can be adjusted by changing the amount of current flowing through the coil, making it more versatile than a permanent magnet.

What applications rely on an understanding of magnetic strength over distance?

Understanding magnetic strength over distance is essential in many fields, including engineering, physics, and geology. It is crucial in designing and using tools that rely on magnetic fields, such as MRI machines, compasses, and electric motors. It is also important in studying the Earth's magnetic field and its effects on our planet.

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