How Do You Calculate Current from a Faraday Disc?

[charlie r]

Hi,

How do you calculate the current from a faraday disc? I have found calculations for the voltage, but what about the current?
I think it is a bit more complicated due to back emf, but if you know what motor you are using (the torque it can generate), then can you work it out?
Thanks for any help,

Charlie

 

[Drakkith]

I see what you mean. I spent a little bit of time looking myself and couldn't find too much. I finally stumbled across the following article. I hope it helps.

http://www.jaredkirschner.com/uploads/9/6/1/0/9610588/homopolargenerator.pdf

 

[charlie r]

Thanks Drakkith, great link.
It seems that this isn't as simple as i first hoped it was!

Charlie

 

[Malverin]

If you use a flat coil instead of solid disk and coil is wind in such direction, that its magnetic field adds to the field of stator magnets, the generator will be more efficient.

 

[sardar]

Hello Charlie,

Calculating the current from a Faraday disc involves understanding the principles of electromagnetic induction. The Faraday disc is a type of generator that converts mechanical energy into electrical energy through the rotation of a disc in a magnetic field. The voltage produced by the Faraday disc can be calculated using the formula V = B * l * w * sin(theta) * N, where B is the magnetic field strength, l is the length of the disc, w is the width of the disc, theta is the angle between the magnetic field and the disc, and N is the number of turns in the coil.

To calculate the current, you will need to know the resistance of the circuit that the Faraday disc is connected to. Using Ohm's law (I = V/R), you can calculate the current by dividing the voltage by the resistance. However, as you mentioned, the current calculation can be more complicated due to back electromotive force (EMF). This is a voltage that is generated in the opposite direction of the current flow and can decrease the overall current produced.

To account for back EMF, you will need to know the speed of the disc rotation and the strength of the magnetic field. With this information, you can use the formula V = B * l * w * omega * N, where omega is the angular velocity of the disc. This will give you a more accurate calculation of the voltage produced, which can then be used to calculate the current.

In terms of considering the torque of the motor, this will affect the speed of the disc rotation and therefore the voltage and current produced. The higher the torque of the motor, the faster the disc will rotate, resulting in a higher voltage and current output. However, the torque alone cannot determine the current, as it is also influenced by the resistance and back EMF.

I hope this information helps. Please let me know if you have any further questions.

Best,