What do you mean by commutation explain?
Commutation refers to the right that a beneficiary has to exchange one type of income for another. Commutation is offered to annuitants and to the beneficiaries of life insurance policies so that they might receive a lump-sum payment instead of a series of future payments.
What is meant by commutation in electrical?
A commutator is a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. By reversing the current direction in the rotating windings each half turn, a steady rotating force (torque) is produced.
What is a commutator in a DC machine Mcq?
What is a commutator in DC machines? Explanation: Commutator is an electrical device found only in DC machines. It is used to reverse the current direction between rotor and external circuit. It also changes dc voltage to alternating voltage.
What is commutation in a motor?
Put simply, commutation is the process of switching the current in the motor phases to generate motion. Brushed motors have physical brushes to achieve this process twice per rotation, while BLDC motors do not, hence the name. Due to the nature of their design, they can have any number of pole pairs for commutation.
What is commutation define In short?
1 : exchange, trade. 2 : replacement specifically : a substitution of one form of payment or charge for another a commutation by money payment for the exacted service. 3 : a change of a legal penalty or punishment to a lesser one commutation of a death sentence.
How do dc machines improve commutation?
Methods of Improving Commutation
- Resistance commutation.
- E.M.F. commutation.
- Compensating windings.
What is commutation period?
The commutation in DC machine or more specifically commutation in DC generator is the process in which generated alternating current in the armature winding of a dc machine is converted into direct current after going through the commutator and the stationary brushes. It is called commutation period.
Which coil is shorted in the commutation process?
Which coil is shorted in commutation process? Explanation: During the commutation period, the coil is shorted via the commutator segments by the brush. These brushes are located in interpolar regions electrically, and magnetically in neutral region. Thus, interpolar coil gets shorted.
What is the need of commutation?
The SCR can be brought back to the forward blocking state from the forward conduction state only by reducing the anode or forward current below the holding current level. The turn OFF process of an SCR is called Commutation. Commutation means transfer of current from one circuit to another.
What is commutation in inverter?
rectifier and inverter circuits must be commutated or. turned off during operation. Commutation is basically the. act of stopping or diverting current flow from a conducting. path in such a circuit.
How does commutation take place in a DC machine?
Commutation in DC machine commutation in DC machine is the process in which generated alternating current in the armature winding of a dc machine is converted into direct current after going through the commutator and the stationary brushes. it will takes place, the coil undergoing commutation is short circuited by the brush.
How does commutator convert AC to DC in a DC generator?
The commutation in DC machine or more specifically commutation in DC generator is the process in which generated alternating current in the armature winding of a dc machine is converted into direct current after going through the commutator and the stationary brushes.
What does commutation mean in a short circuit?
The term Commutation means, the change that takes place in a winding element during the period of a short circuit by a brush. The change from a generated alternating current to the direct current applied involves the process of Commutation.
When does commutation take place in an armature?
The change from a generated alternating current to the direct current applied involves the process of Commutation. When the conductors of the armature are under the north pole, the current which is induced flows in one direction The current flows in the opposite direction when they are under south pole.
