Magnetic Coupling

Contactless Torque • F ∝ 1/d² • 8 Alternating Poles • Ammo.js Torque • Slip Detection

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Coupling Geometry

Magnet Count (per disc) 8

Disc Radius 2.0

Disc Thickness 0.3

Air Gap 0.6

Magnet Radius 0.25

Shaft Length 3.0

Drive Motor (Shaft A)

Drive Speed (RPM) 120

Drive Torque 5.0

Magnetic Field

Magnet Strength (k) 50

Damping 0.4

Load (Shaft B)

Load Friction 2.0

Load Inertia 1.0

Sudden Load Burst 0

Speed Control

120 RPM

RPM

Show Field Lines

Show Torque Graph

Show Torque Arrows

Show Speed Effects

Magnetic Coupling — 3D

Shaft A: 0 RPM • Shaft B: 0 RPM • Slip: 0° • Power: 0 W • State: LOCKED

Coupling State

MAGNETICALLY LOCKED

Transmitted Torque

0.00

N·m

Angular Slip

0.0

degrees

Slip Events

total

Transmitted Power

0.0

Magnets / Disc	—
Disc Radius	—
Air Gap	—
Magnet Strength k	—
Shaft A RPM	0
Shaft B RPM	0
Drive Torque	—
Load Friction	—
Max Mag. Torque	—

Physics

Magnetic Force: F = k / d² (inverse square law)
where k = magnet strength, d = distance between opposing magnets

Torque Transfer: Each magnet pair (N-S attract, N-N / S-S repel) generates tangential force → net torque on Shaft B.

Alternating Poles: N-S-N-S arrangement on each disc ensures strong angular locking at discrete positions (2π/N apart).

Slip Condition: When applied load torque > max magnetic torque, the coupling "slips" — Shaft B loses synchronization and the field oscillates.

No Physical Constraint: Shafts are completely decoupled in Ammo.js; torque is transferred purely by computed magnetic forces applied via applyTorque().

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