Force in a magnetic coupling

In summary, to determine the size and strength of magnets needed for a magnetic coupling, you can use Magnetostatics equations or utilize experiments and FEA for a more accurate analysis.
  • #1
Jonny6001
20
0
Hello,

I trying to create a magnetic coupling on the end of a shaft but I need to work out the size of the magnets that are needed.
The torque on one shaft needs to be transferred to the other through the magnetic interaction. The magnets on the outer shaft will be opposite polarity to it's aligned counterpart on the internal shaft, thus creating an attraction. The adjacent magnet will be of the same polarity therefore producing a repulsion force, this force will increase as the level of "slip" between the two shafts increases.

I understand that if you bring the N and S poles of two magnets close on a planar surface the magnetic field will more or less be perpendicular to the faces and therefore the force. What would happen if you were to move one magnet below the other with a small gap but keeping the attracting poles together:
N-------S
S-------N

I feel that the fields would then curl around similar to this

two-parallel-bar-magnets-and-the-magnetic-field-thumb22414947.jpg


They would obviously be arranged in a circular array around each coupling.

What I'm really getting at is, is there a relatively easy was of calculating what the magnetic force will be between the magnets and how much torque could be transmitted through the coupling?
Or is this something that would need to be solved using FE methods or experiments?

Thanks very much for your time.
 
Physics news on Phys.org
  • #2
The answer to your question will depend on the size and strength of the magnets you use. You can calculate the magnetic force between two magnets using Magnetostatics, which is a branch of Physics that deals with the behavior of magnetic fields. The equations of Magnetostatics can be used to calculate the force and torque produced by magnets in various configurations. To calculate the force between two magnets arranged as you described, you will need to know the magnetic field strength of the magnets, the distance between them, and the angle between their polarities. With these values, you can then use the equations of Magnetostatics to calculate the force and torque produced.Additionally, you may find it helpful to experiment or use Finite Element Analysis (FEA) to better understand the forces at play in this arrangement. FEA can provide a more detailed analysis of the magnetic field produced by the magnets, which can help you determine the exact force and torque needed for your application.
 

What is a magnetic coupling?

A magnetic coupling is a mechanism that uses magnetic fields to transmit force between two rotating or linearly moving objects without physical contact. It is commonly used in motors, generators, and other mechanical systems.

How does force in a magnetic coupling work?

The force in a magnetic coupling is generated by the interaction between two magnetic fields. When the two objects are close enough, the magnetic fields interact and create a force that can transmit rotational or linear motion.

What factors affect the force in a magnetic coupling?

The force in a magnetic coupling is affected by the strength of the magnetic fields, the distance between the two objects, and the relative orientation of the magnetic fields. The force can also be affected by external factors such as temperature and interference from other magnetic fields.

Can the force in a magnetic coupling be controlled?

Yes, the force in a magnetic coupling can be controlled by adjusting the strength of the magnetic fields, the distance between the objects, and the orientation of the magnetic fields. This allows for precise control of the transmitted force in a mechanical system.

What are the advantages of using a magnetic coupling?

Using a magnetic coupling eliminates the need for physical contact between two objects, reducing wear and tear on the components. It also allows for a smooth and efficient transfer of force, and can operate in environments where traditional mechanical couplings may not be suitable, such as in corrosive or high-temperature environments.

Similar threads

  • Electromagnetism
Replies
7
Views
157
  • Electromagnetism
Replies
7
Views
1K
Replies
32
Views
1K
  • Electromagnetism
Replies
11
Views
1K
  • Electromagnetism
Replies
7
Views
891
  • Electromagnetism
Replies
5
Views
201
Replies
8
Views
654
  • Electromagnetism
Replies
5
Views
1K
  • Electromagnetism
Replies
3
Views
92
  • Electromagnetism
Replies
3
Views
1K
Back
Top