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What is the difference between commutator and rectifier?
ShaunMarshgp7659
commutator also acts as an mechanical rectifier in the case of dc machines.by deviding the commutator into two parts that will accept the +ve cycle & ignore the -ve cycle.so it act as a rectifier.
Wiki User
∙ 14y ago
Wiki User
∙ 8y agoThe commutator in a DC generator is sometimes described as a mechanical rectifier. It works by reversing the connections to the windings at the correct angle so that the output is unidirectional. A commutator can be seen as a synchronous switch, and commutate means 'to exchange'. When a commutator is used with a DC motor it is still a synchronous switch, still commutating, but not rectifying. A rectifier uses diodes (one way flow) to steer the path of the current, so can be used to rectify AC - meaning 'make it right, or refine', so convert AC to DC, which was once considered the desired electricity. Rectifiers were developed after commutators. Some earlier types used copper oxide, selenium oxide (both semiconductors), then thermionic vacuum tubes, Mercury arc tubes. There have also been synchronous switches using a vibrating relay.
Ecko · 2 years ago
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Does the commutator of a DC machine act as a half-wave rectifier?
No.It act as fullwave rectifier
What is the main difference between a bridge rectifier and a full wave rectifier?
Both the bridge rectifier and the full-wave rectifier achieve the same thing. They rectify the AC input on both opposing phases so as to minimize ripple time and voltage. The difference is that a bridge rectifier consists of four diodes arranged in a bridge, so the input needs to only be single phase AC, while a full wave rectifier consists of two diodes, but needs a split phase AC source, such as provided by a center tapped transformer winding. Also, the bridge rectifier presents two junction drops in the output, because there are always two diodes in series, while the full-wave rectifier presents only one junction drop in the output, because there is only one. It is a trade-off.
Difference between 4 diodes and 2 diodes rectifier?
a 2 diode rectifier is a center tap rectifier an a 4 diode rectifier will be a bridge rectifier *********************************************************** A two-diode rectifier is not always a centre-tap rectifier. If the two diodes are connected to the same end of a transformer's secondary, one by its anode and one by its cathode, one will proved a positive voltage with respect to trhe other end of the winding and the other will provide a negative voltage. (But perhaps that isn't considered a two-diode rectifier - but a two single-diode ones.)
Why commutator are not used in ac motors?
Because, the commutator segments are used for converting AC to DC.
What is the definition of commutator?
A commutator is an electrical switch that periodically reverses the current direction in an electric motor or electrical generator. A commutator is a common feature of direct current rotating machines.
Function of a commutator?
it serves as a mechanical rectifier
Does the commutator of a DC machine act as a half-wave rectifier?
No.It act as fullwave rectifier
Difference between AC and DC generator?
The major difference between an AC generator and a DC generatoris that the DC generator requires a mechanism to provide a DC output. This can be done mechanically with a commutator or electronically with a rectifier. Internally, all generators produce an alternating voltage. Allgeneratorsrequire a magnetic field.
What is the basic difference between carbon brush of AC slip ring motor and carbon brush of Direct current commutator motor?
The only difference between slip rings and commutator is that commutator can change the frequency where as the slip rings can not do it.
What is the need of commutator in DC generator?
The commutator has two functions: (1) it enables current to pass to the external fixed wiring from the rotating armature, and (2) it is a rotating rectifier, which converts the a.c. voltage generated in the rotating armature, to a d.c. voltage.
4 What is the difference between a transformer and a rectifier Which are found in a PC power supply?
A rectifier is a device that converts alternating current to direct current. A transformer is a device that changes the ratio fo current to voltage. A rectifier is found in a PC power supply.
What is the difference between alternators and dynamos?
Alternators produce AC, which is rectified by diodes if DC is needed. Dynamos produce DC by using a commutator.
What is the difference between a transformer and a rectifier Which are found in a PC power supply?
A transformer is a device that changes the level of an a.c. voltage, while a rectifier is a device that converts alternating current to direct current.
The difference between a transfer and a rectifier?
A transformer is basically used to step up or step down the main power supply. The rectifier is used to convert an alternating current (AC) or voltage to direct current (DC) or voltage.
What is the difference between a half wave rectifier and a negative clipper?
As far as general principles apply, they both perform the same function: using a diode.
What is the difference between a one diode rectifier and a two diode rectifier?
A one diode rectifier is called a half wave rectifier and only allows current flow for the positive portion of the sine wave. A two diode rectifier, or full wave rectifier allows positive current flow during the positive portion of the wave as well as positive current flow during the negative portion of the sine wave. This results in a much cleaner DC power signal. The addition of a capacitor in the output circuit will clean up the signal very nicely.
What is the difference between controlled and uncontrolled rectifier?
A simple rectifier is a diode. It only has two terminals and will only allow electron flow in one direction only. A controlled rectifier (SCR=silicon controlled rectifier) has a third connection (gate). Which as the name suggests, is a gate that controls at which point the rectifier will work. It therefore has a level of control.There are various types and you would need the application specification, to get the best use of them.
