Commutation may mean:

• In Mathematics, commutation refers to a Commutative operation, where a x b = b x a
• In Law, commutation refers to a reduction in sentence for a criminal act.
• In Electricity, commutation refers to the action of applying currents or voltages to the proper motor phases so as to produce optimum motor torque at the motor's shaft. In brush type motors, commutation is done electromechanically via graphite brushes and commutator. In brushless motors, commutation is done by switching electronics using rotor position information obtained by Hall sensors, optical encoder, or a resolver.
• In Neurophysiology, commutation refers to how certain neural circuits in the brain exhibit noncommutativity.

Komutace | Kommutation | Commutateur