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.
How do you define a commutator?
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. It consists of a cylinder composed of multiple metal contact segments on the rotating armature of the machine.
What is commutative in quantum mechanics?
Two particular quantum operators for which the relation (5.1) is true for every function φ are called commutative operators, and the corresponding physical quantities are called commutative entities.
What is commutation in motor?
In order to generate motion in a three-phase linear motor there must be switching between the phases to energize appropriate windings. The process of switching between the phases is called commutation.
What is an example of commutation?
commutation, in law, shortening of a term of punishment or lowering of the level of punishment. For example, a 10-year jail sentence may be commuted to 5 years, or a sentence of death may be commuted to life in prison.
What is commutation in circuit?
The purpose of the commutation cell is to “chop” DC power into square wave alternating current. This is done so that an inductor and a capacitor can be used in an LC circuit to change the voltage. This is, in theory, a lossless process; in practice, efficiencies above 80-90% are routinely achieved.
Why is a commutator used?
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 commutator and rectifier?
Rectifier is used to convert an AC electricity to DC electricity, whereas Commutator is used to change the current direction, like, to make it periodic, like, on armature. Rectifier is stationary component. Commutator isn’t. Rectifier’s main component are diodes, Commutator’s main component are copper segments.
What is another name for commutator?
commutator; reverser; current-reverser; switch.
What is commutative in simple words?
: being a property of a mathematical operation (as addition or multiplication) in which the result does not depend on the order of the elements. The commutative property of addition states that 1 + 2 and 2 + 1 will both have a sum of 3.
What is commutative in vectors?
1. The Commutative law states that the order of addition doesn’t matter, that is: A+B is equal to B+A. 2. The Associative law states that the sum of three vectors does not depend on which pair of vectors is added first, that is (A+B)+C=A+(B+C).
What is the law of commutative?
commutative law, in mathematics, either of two laws relating to number operations of addition and multiplication that are stated symbolically as a + b = b + a and ab = ba. From these laws it follows that any finite sum or product is unaltered by reordering its terms or factors.
What is commutation and its types?
By the commutation process, the thyristor operating mode is changed from forward conducting mode to forward blocking mode. So, the thyristor commutation methods or thyristor commutation techniques are used to turn off. The commutation techniques of thyristors are classified into two types: Natural Commutation.
What are the types of commutation?
- Natural Commutation.
- Forced Commutation. Class A: Self or Load Commutation. Class B: Resonant-Pulse Commutation. Class C: Complementary Commutation. Class D: Impulse Commutation. Class E: External Pulse Commutation.
What are the two types of commutation?
Class-A Commutation (also known as Load Commutation) Class-B Commutation (also known as Resonant Pulse Commutation)
What is the formula of commutation?
Formula for working out Commuted Value of pension = Amount of pension to be commuted X 12 X purchase value for age next birth day.
How do you get commutation?
A request for a commutation of a prison sentence generally is not accepted unless and until a person has begun serving that sentence. In addition, a commutation request generally is not accepted from a person who is currently challenging his or her conviction or sentence through appeal or other court proceeding.
What do you mean by commuted?
Definition of commute (Entry 1 of 2) transitive verb. 1a : change, alter. b : to give in exchange for another : exchange commuting foreign currency to domestic. 2 : to convert (something, such as a payment) into another form The periodic payments may be commuted into a lump sum.
Which commutation is best?
Detailed Solution. For high output power where load fluctuation is not high, voltage commutated chopper is commonly used for the best performance.
What is commutation voltage?
Basically, in voltage commutation, a large conducting thyristor is turned off by the application of large reverse voltage. This reverse voltage across the conducting thyristor reduces the anode current and rapidly it will reach zero. Also, the reverse voltage existing across the thyristor will keep it in the off state.
What is the definition of resistance commutation?
[ri′zis·təns ‚kam·yə′tā·shən] (electricity) Commutation of an electric rotating machine in which brushes with relatively high resistance span at least one commutator segment, in order to achieve a linear variation of current with time, and thereby minimize self-inductive voltage in the coils.
Can commutator convert AC to DC?
To convert AC generator to DC generator, ring type commutator must be used.
Is commutator a rectifier?
In a DC generator, the commutators act as a mechanical rectifier that converts the alternating current from the windings to direct current in the external load circuit. In a DC motor, the commutator provides the electrical current to the windings by reversing the direction of the current.
Why carbon is used in commutator?
Carbon is used because of its self-lubricating properties, this means less wear on the commutator in comparison with brushes made of harder metals such as copper or steel, in addition to this, it is a good conductor.
What is rectifier explain?
A rectifier is a device that converts an oscillating two-directional alternating current (AC) into a single-directional direct current (DC). Rectifiers can take a wide variety of physical forms, from vacuum tube diodes and crystal radio receivers to modern silicon-based designs.