# What is the role of commutator in AC commutator motor?

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The commutator assures that the current from the generator always flows in one direction. … 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.

## What is the function of the commutator?

The function of commutator ring in an electric motor is to reverse the direction of current flowing through the coil every time coil just passes the vertical position during a revolution. Hence as the direction of the current is reversed, the torque is changed in the direction.

## Why do AC motors need brushes?

The field induces a current flow into the shorted armature whose magnetic field opposes that of the field coils. Speed can be controlled by rotating the brushes with respect to the field axis. This motor has superior commutation below synchronous speed, inferior commutation above synchronous speed.

## What is the difference between armature and commutator?

An armature is a combination of the winding, commutator, brushes, and ball bearings.

What is Commutator?

Armature Commutator
It produces flux that interacts with the main field to produce armature reaction Due to the armature reaction, the commutator is able is to receive the current from the core winding.

## What is a commutator definition?

1 : a series of bars or segments connected to the armature coils (see armature sense 2b)of a generator or motor so that rotation of the armature will in conjunction with a set of fixed brushes (see brush entry 2 sense 3) convert alternating current into direct current.

## What instrument is used to check run out of commutator?

Using a MTI Microtrak 4 laser triangulation sensor to measure a DC motor’s armature / commutator bar run out.

## How does commutator reverse current?

The split ring commutator reverse the current in the armature every half revolution when the commutator changes contact from one brush to another. This reverse in current causes the forces acting on the coil to be reversed.