On DC and most AC motors the purpose of the commutator is to insure that the current flowing through the rotor windings is always in the same direction, and the proper coil on the rotor is energized in respect to the field coils.
Q. What is the principle of an electric generator?
Electric generators work on the principle of electromagnetic induction. A conductor coil (a copper coil tightly wound onto a metal core) is rotated rapidly between the poles of a horseshoe type magnet. The conductor coil along with its core is known as an armature.
Q. What is the purpose of brush?
A brush or carbon brush is an electrical contact which conducts current between stationary wires and moving parts, most commonly in a rotating shaft. Typical applications include electric motors, alternators and electric generators.
Q. Where is commutator used?
Commutators are used in direct current (DC) machines: dynamos (DC generators) and many DC motors as well as universal motors. In a motor the commutator applies electric current to the windings. By reversing the current direction in the rotating windings each half turn, a steady rotating force (torque) is produced.
Q. What is the physical meaning of commutator?
A commutator in quantum mechanics tells us if we can measure two ‘observables’ at the same time. If the commutator of two ‘observables’ is zero, then they CAN be measured at the same time, otherwise there exists an uncertainty relation between the two.
Q. Does position and angular momentum commute?
The operator nature of the components promise difficulty, because unlike their classical analogs which are scalars, the angular momentum operators do not commute. Example 9–1: Show the components of angular momentum in position space do not commute. y = 0, therefore Lx and Ly do not commute.
Q. Does the Hamiltonian commute with angular momentum?
Angular momentum operator L commutes with the total energy Hamiltonian operator (H).
