18th November 2019

differencebetween

13

What is the difference between an alternator and a generator?

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An alternator can be called a type of generator. Both alternators and generators convert mechanical energy into electrical energy. The main difference between them is in regard to what spins and what is fixed. In an alternator, electricity is produced when a magnetic field spins inside the stator (windings of wire).

Likewise, what is meant by brushless excitation system?

Brushless Exciters. WEG Electric Machinery's (WEM) brushless excitation system consists of a high frequency AC generator (armature & field) and rotating rectifier bridge. Rotating rectifier redundancy with detection of diode failure which in operation allows for more convenient maintenance intervals.

What is an exciter for a generator?

The essential part of this principle is the magnetic field. The magnetic filed is produced from a DC power source from an Exciter that is part of the generator system. The rotor is a rotating electromagnet that requires a DC ( Direct Current) electric power source to excite the magnetic field.

1

Do generators have alternators?

Generator and alternator are two devices, which convert mechanical energy into electrical energy. Both have the same principle of electromagnetic induction.

2

What is the difference between an AC and DC generator?

The major difference between an AC generator and a DC generator is 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. All generators require a magnetic field.

3

Can the alternator charge the battery?

Fact: Alternators are not designed to charge dead batteries. However, when you use jumper cables to start your vehicle, you are placing a tremendous strain on your vehicle's alternator and battery. That is why we recommend fully-charging deeply-discharged batteries with a battery charger as soon as possible.

4

What is the difference between generator and alternator?

An alternator can be called a type of generator. Both alternators and generators convert mechanical energy into electrical energy. The main difference between them is in regard to what spins and what is fixed. In an alternator, electricity is produced when a magnetic field spins inside the stator (windings of wire).

5

Why is the use of AC preferred over DC?

Due to the following reasons, AC systems are preferred over DC systems: It is easy to maintain and change the voltage of AC electricity for transmission and distribution. Plant cost for AC transmission (circuit breakers, transformers etc. ) is much lower than the equivalent DC transmission.

6

What is the function of alternator in generator?

An alternator is an electrical generator that converts mechanical energy to electrical energy in the form of alternating current. For reasons of cost and simplicity, most alternators use a rotating magnetic field with a stationary armature.

7

Do alternators produce AC or DC?

In a so-called 'DC generator', this AC current is generated in the rotating armature, and then converted to DC by the commutator and brushes. In an 'alternator', the AC current is generated in the stationary stator, and then is converted to DC by the rectifiers (diodes).

8

What is a rotor and a stator?

The term, "stator" is derived from the word stationary. The stator then is the stationary part of the AC motor. The rotor is the rotating electrical component. It also consists of a group of electro-magnets arranged around a cylinder, with the poles facing toward the stator poles.

9

What is the difference between a dynamo and a generator?

Dynamos and Generators convert mechanical rotation into electric power. Dynamo - a device that makes direct current electric power using electromagnetism. It is also known as a generator, however the term generator normally refers to an "alternator" which creates alternating current power.

10

Why AC power transmission is preferred over DC?

It is easy to maintain and change the voltage of AC electricity for transmission and distribution. Plant cost for AC transmission (circuit breakers, transformers etc.) is much lower than the equivalent DC transmission. From power stations, AC is produced so it is better to use AC than DC instead of converting it.

11

How does a DC generator work?

A dc generator is an electrical machine which converts mechanical energy into direct current electricity. This energy conversion is based on the principle of production of dynamically induced emf. This article outlines basic construction and working of a DC generator.

12

Why AC system is preferred for transmission and distribution over DC system?

Answer: Due to following reasons, AC systems are preferred over DC systems: a. It is easy to maintain and change the voltage of AC electricity for transmission and distribution. Plant cost for AC transmission (circuit breakers, transformers etc) is much lower than the equivalent DC transmission c.

13

What is the difference between a motor and an alternator?

Electric motor is a device which converts electric energy(AC& DC both) to mechanical energy. In simple term motor is driven by electricity either DC or AC supply whereas alternator is AC current Generator which generates the AC current required for driving the above motor if it is an AC motor.

14

What is the use of armature winding?

The armature winding is the main current-carrying winding in which the electromotive force or counter-emf of rotation is induced. The current in the armature winding is known as the armature current. The armature windings of dc motors are located on the rotor, since they must operate in union with the commutator.

15

What is the difference between an electric motor and a generator?

A generator converts mechanical energy into electrical energy, while a motor does the opposite - it converts electrical energy into mechanical energy. Both devices work because of electromagnetic induction, which is when a voltage is induced by a changing magnetic field.

16

What is the synchronous generator?

Synchronous generators are the majority source of commercial electrical energy. They are commonly used to convert the mechanical power output of steam turbines, gas turbines, reciprocating engines and hydro turbines into electrical power for the grid. The load supplied by the generator determines the voltage.

17

Why is back EMF used for a DC motor?

When the armature of a d.c. motor rotates under the influence of the driving torque, the armature conductors move through the magnetic field and hence e.m.f. is induced in them as in a generator. The induced e.m.f. acts in opposite direction to the applied voltage V (Lenz's law) and in known as back or counter e.m.f.

18

What is the difference between an alternator and a dynamo?

The main difference between dynamos and alternator is the type of current they produce. The commutator constantly changes the polarity of the output current so that the output is always of the same polarity. Without a commutator, a dynamo would simply produce alternating current just like an alternator.

19

How does an alternator in a car work?

As the rotor revolves it generates a higher current in the stator windings. A car uses quite a lot of electricity to work the ignition and other electrical equipment. The alternator consists of a stator - a stationary set of wire coil windings, inside which a rotor revolves.

20

Can you drive a car with a bad alternator?

Yes , a car will run with a bad alternator……until the battery goes dead. Yes but eventually the car will die when the battery no longer has power to run the spark plugs and other systems. If you shut the car off , it will likely not start again without a jump start.

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