what are the major differences between the AC generator and DC generator?

Answer 1

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. The field can be provided by permanent magnets or by a DC current that the generator produces itself. If the generator produces its own magnetic field, it can be initially put into operation using residual magnetism or by initially generating the field with an external power source. The only type of generator that uses a type of AC field excitation is an induction generator, essentially an induction motor operating as a generator.

Power station generators generally have the DC field winding on the rotor with excitation current supplied through slip rings. Three phase windings on the stator provide three phase output power. Automotive alternators are similar but they have a rectifier to provide a DC output.

Answer 2

Ac And Dc Generator

Answer 3

A DC generator produces a steady output voltage that does not vary in voltage, or time.

Actually, a DC generator could produce an AC output. It doesn't because the voltage is picked up from what is known as a commutator ring.

There are several separate coils in the rotor of the generator.

The coils are connected to contacts in the commutator ring and are spaced 180 degrees apart so that when they line up with the brushes that make contact with this ring, the connection is polarized as positive for one end of the coil and negative for the other end of the coil.

Primary Uses of AC and DC Generators

AC and DC generators serve different purposes. Homes typically use AC generators to power small motors and common electrical appliances. These include vacuum cleaners, food mixers, juicers and electrical fixtures.
DC generators power very large electric motors — such as those needed for subway systems. Moreover, DC generators provide a reliable and efficient energy supply that can charge banks of batteries used for mobile and off-grid uses.



Design Differences

Both AC and DC generators produce currents via electromagnetic induction. In AC generators, the coil through which the current flows is fixed, and the magnet is moving. The magnet’s north and south poles cause the current to flow in opposite directions, producing an alternating current.
With DC generators, the coil through which the current flows rotates in a fixed field. The two ends of the coil attach to a commutator: different halves of a single, rotating split ring. Metal brushes connect these split rings to an external circuit. The commutator balances the charges leaving and returning to the generator, resulting in a current that does not change direction.

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Answer 4

The basic difference:

AC gen uses Slip rings and brushes (there are brushless designs as well)

DC gen uses a Commutator and brushes.

The commutator switches polarity of the winding as the shaft rotates. The switching occurrs where the generated voltage would start to change polarity. In essence the commutator acts like a mechanical fullwave rectifier allowing the generator to produce a unidirectional flow of electricity (DC)

Answer 5

maximum ac turbines have 3 armature windings on the stator and one field winding on the rotor. it is for 3-area machines. DC turbines have a single field winding on the stator and a single armature winding on the rotor. The rotor is hooked as much as the exterior international by using potential of a commutator and brushes, whose purpose is to change the polarity on the armature in accordance to its place. If slip jewelry have been used somewhat of a commutator, the output of the device would be some form of ac, yet without the super, sparkling waveform.

Answer 6

1. winding- STAR OR DELTA for ac
2.commutator- absent in ac
3.exciter- must in ac
4. AVR- must in ac