What are the advantages of ac generators compared to dc motors? Why is it that today's big generators are talking about generating electricity and getting rid of dc power?
Alternator's advantage is the advantage of developing energy, now is the main ac power on the consumption of energy, and this kind of generator maintenance convenient, and durable. And dc generator for dc energy consumption only, in addition to small household electrical appliances is large motor with this kind of dc power supply, small home appliance is not necessary to buy a dc generator for power supply? And large motor, need large generators to supply power, to know the large generator driven by either hydraulic or mechanical energy or wind need to consume large amounts of diesel oil, water or wind, and want to have big permanent magnet iron core or high power rectifier devices. Permanent magnetic iron core is one of the best in the dc generator, but also need high power permanent magnet generating large generator drive, and is very difficult to start, or excitation coil dc power supply, need to control dc again. A lot of trouble. Instead of using alternating current, the whole flow can also save energy. This is just my personal opinion, I don't know if it's right or wrong.
Alternator's advantage is the advantage of developing energy, now is the main ac power on the consumption of energy, and this kind of generator maintenance convenient, and durable. And dc generator for dc energy consumption only, in addition to small household electrical appliances is large motor with this kind of dc power supply, small home appliance is not necessary to buy a dc generator for power supply? And large motor, need large generators to supply power, to know the large generator driven by either hydraulic or mechanical energy or wind need to consume large amounts of diesel oil, water or wind, and want to have big permanent magnet iron core or high power rectifier devices. Permanent magnetic iron core is one of the best in the dc generator, but also need high power permanent magnet generating large generator drive, and is very difficult to start, or excitation coil dc power supply, need to control dc again. A lot of trouble. Instead of using alternating current, the whole flow can also save energy. This is just my personal opinion, I don't know if it's right or wrong.
The disadvantages of the single most important one: dc generator, commutator, commutator, to direct current (dc), however, general from the collector ring commutator and carbon brush, mechanical wear, coil and carbon brush to produce graphite powder is easy to pollution, malfunction. Second: industrial dominant, industry important mechanical - three-phase asynchronous motor, the power supply must be alternating current (ac), because an alternating current to produce a rotating magnetic field, the drive motor. Third: alternating current to direct current only needs rectifier bridge, economy, simple. But direct current turns into alternating current costs, and it's complicated
The biggest advantage of ac generators is that there is no commutator. And alternator can laid poles on the rotor, it's more manufacturing created the condition for the large capacity generator (excitation power is a few percent of generator power only); Due to the existence of commutator, the development of dc generator is limited. The widely application of the alternator has also benefited from the invention of the ac squirrel-cage motor, ac squirrel-cage asynchronous motor has simple structure, strong, easy maintenance, the advantages of dc motor pressure up anymore; In addition, the alternating current can be changed at random and can be transported over long distances. Due to alternating current (ac) is widely used, so the alternator also got great development, in addition, the development of power electronic technology, the direct current (dc) don't need a dc generator can get, so less dc generator.
