# Question: What is motor commutation?

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## What is commutation motor?

The process of commutation in a synchronous motor is that of switching between the phases. It is possible to switch between the phases in such a way that the winding will alternately attract and repel the permanent magnets to create the desired motion through Lorentz Law.

## What is commutation in DC motor?

Commutation in DC machines is the process by which the reversal of current takes place. In DC generator this process is used to convert the induced AC in the conductors to a DC output. In DC motors commutation is used to reverse the directions of DC current before being applied to the coils of the motor.

## What is called commutation?

noun. the act of substituting one thing for another; substitution; exchange. the changing of a prison sentence or other penalty to another less severe. the act of commuting, as to and from a place of work. the substitution of one kind of payment for another.

## What does commutation mean in electronics?

Commutation means transfer of current from one circuit to another. … The anode or forward current of SCR must be reduced to zero or below the level of holding current and then, A sufficient reverse voltage must be applied across the SCR to regain its forward blocking state.

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## What are the types of commutation?

Three types of commutation are identified: i) Voltage commutation, ii) Current commutation and iii) Load commutation. In a voltage commutated thyristor circuit a voltage source is impressed across the SCR to be turned off, mostly by an auxiliary SCR.

## Why commutator is needed?

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 effect of under commutation?

Thus, the cause of sparking at the commutator is the failure of the current in the short-circuited elements to reach the full value in the reverse direction by the end of the short circuit. This is known as under commutation or delayed commutation.

## What are the 3 types of DC motors?

There are 3 main types of DC motor that are available:- Series, Shunt and Compound. These terms relate to the type of connection of the field windings with respect to the armature circuit.

## What is ideal commutation?

Ideal Commutation:

(also called straight-line commutation) is that in which the current of the commutating coils changes linearly from +Ic to -Ic to in the commutation period as shown in Fig. … The figure also shows delayed Commutation in DC Machine and the current (Ic – I′c) in the spark.

## What does commutation mean in math?

In mathematics, a binary operation is commutative if changing the order of the operands does not change the result. … The idea that simple operations, such as the multiplication and addition of numbers, are commutative was for many years implicitly assumed.

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## What is back EMF in motor?

back EMF in Electrical Engineering

Back EMF is the system in the coil of an electric motor that opposes the current flowing through the coil, when the armature rotates. When the speed varies, the winding characteristics may fluctuate, resulting in variation of back EMF.

## What is commutation of pension in India?

At the time of retirement, if an employee opts for commutation of pension, a lump sum amount is paid to the pensioner while on the balance the pension begins. In simple terms, commutation means a lump sum payment in lieu of periodic payments of pension. … a) The payment in such a case will be made by the bank.

## What are the two methods of commutation?

Commutation is the process of turning off a conducting thyristor. There are two types of commutation viz. current and voltage based.

## What is natural or line commutation?

Natural or Line commutation is a Class-F SCR commutation technique in which, a thyristor is turned off due to natural current zero and voltage reversal after every half cycle.

## What is class A commutation?

Class A commutation of thyristor is a type of forced commutation and is also referred to as Load Commutation. It is one of the widely used commutation techniques that mainly find applications in high-frequency operations. Previously we have discussed that commutation of thyristor corresponds to turning the SCR off.