Commutator in DC Machine

The commutator is an essential part of a DC machine, which converts alternating current (AC) into direct current (DC). It is a mechanical device that acts as a switch to reverse the direction of current flow in the armature windings.

Mechanical Inverter

An inverter is a device that converts DC power into AC power. The commutator in a DC machine can be considered as a mechanical inverter because it converts the AC voltage induced in the armature windings to DC voltage at the output terminals.

Mechanical Rectifier

A rectifier is a device that converts AC power into DC power. The commutator in a DC machine can also be considered as a mechanical rectifier because it rectifies the AC voltage induced in the armature windings to DC voltage at the output terminals.

Current Controller

The commutator in a DC machine also acts as a current controller. It controls the direction and magnitude of the current flowing through the armature windings. By reversing the polarity of the commutator segments, the direction of the current can be changed, and by varying the brush position on the commutator, the magnitude of the current can be controlled.

Conclusion

Therefore, we can conclude that the commutator in a DC machine acts as both a mechanical inverter and a mechanical rectifier, and also acts as a current controller. It is an essential component of a DC machine that converts AC power to DC power, making it ideal for DC power applications.