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Easily calculate magnetomotive force (MMF) with our simple Magnetomotive Force Calculator. Fast, accurate results for students and engineers.
If you’ve ever wondered how to measure the push that creates a magnetic field, you’re in the right place. Magnetomotive force, or MMF, is what makes magnets work. Think of it as the "pressure" that drives magnetic lines through a coil or circuit.
We made this Magnetomotive Force Calculator so you can get your answers fast. No fuss, no math headaches. Just enter a couple of numbers, and you’ll get your MMF in seconds.
MMF is the force that helps magnetic flux flow in a magnetic circuit. It’s like the battery voltage but for magnets. The more MMF you have, the stronger your magnetic field.
We use the symbol F or sometimes ℱ for it. The unit? Ampere-turns, written as At. It shows how many amps flow through how many coil turns.
Here’s the easy formula:
MMF (F) = Number of turns (N) × Current (I)
For example, if you have a coil with 40 turns and run 3 amps of current, the MMF is:
40 × 3 = 120 ampere-turns
That’s your magnetic push.
MMF is just part of the story. Here are two more easy formulas to keep in mind:
Magnetising Force (H): This tells you the strength of the magnetic field. It’s the MMF divided by the length of the coil path:
H = F / l
where l is the length in meters.
Magnetic Flux Density (B): This shows how dense the magnetic field lines are. It’s calculated by:
B = μ × H
where μ is how easily the material lets magnetism through.
Ready to give it a try? Here’s how:
In a flash, you’ll see your MMF in ampere-turns.
It’s perfect for students and engineers who want quick, accurate answers.
Think about winding a coil for a speaker or a motor. You need the right magnetic force for the job. Too little, and it won’t work right. Too much, and you waste power.
Our calculator helps you find that sweet spot fast. No confusing steps, no second-guessing.
Magnetomotive force might sound tricky, but it’s easy once you get the hang of it. Use our Magnetomotive Force Calculator to save time and effort. Whether you’re studying or building, this tool makes the job simple.
It’s MMF = Number of turns × Current (F = N × I).
Ampere-turns (At).
MMF is the total force, while magnetic field strength divides that force by the coil length.
If there’s no current or no coil turns, yes, the MMF is zero.
It controls how strong your magnetic field will be, which affects many electrical devices.