why there is no two phase generators?

Answer 1

I was in class and our professor was speaking about changing from three phase transmission to six phase electrical transmission. I guess this would be more efficient but would cost lots of money t oaccomplish.

Answer 2

A two phase generator will have coils at 180 degrees. No current or voltage will be produced. The two will produce equal and opposite voltage and current - cancelling each other.

Three phase coils are at 120 degrees, which generates phase deference does not cancel out.

PS

Once the electricity is produce a hose in USA get two of the three phases coming to it. This provide !20 volt and 220 volt.

Electric stoves ovens uses 220-250 V. Lighting uses 110-120 V.

If house has a work shop and it has any 3 phase equipment then third phase is required and it would be 360-420 V system in the shop.

For more go on line or get basic AC Theory book from library.

Answer 3

Let me split the answer into three categories, A. Transmission B. Consumption and C. Generation

A. Transmission
There is not an issue. You can have two carrier lines with two phases and one neutral line. The only issue will be increased Inductance on the insulators that support the lines. At high voltages you have to worry about the Corona and Corona loss as these two phases will attract each other (Being opposite).

B. Consumption: If you build a motor or some device that uses both phases (aka three phase motor), the total power would be ZERO. So, you cant build a two phase motor with both phases being opposite. You can use single phase ones. But that defeats the purpose.

C. Generation: You can't build the generator as it will LOCK. In Three phase Generator, the rotor has dynamic magnets that switch the polarity at 120 degrees so the net effect is not a substantial drag but a push. In case of Two Phases, one cannot easily create a push effect.

Answer 4

It is possible to make two phase generators. But multi-phase transmission is more efficient.
We use three phase (120 degrees * 3 gives full 360 degrees) as it is easier to build them.
(transmission with 3 phase and 1 return, lines - balanced transmission)

More number of phases are difficult to use (think of the uniform rotation of the rotor) generators are used.

Answer 5

I've only seen one or three phase electrical power generators and three phase ones are very expensive.

Three-phase electric power requires less conductor mass for the same voltage and overall amount of power. It has all but replaced two-phase power for commercial distribution of electrical energy, but two-phase circuits are still found in certain control systems.

Two-phase power can be derived from a three-phase source using two transformers in a Scott connection.

Answer 6

Actually..... There are. They're called 'resolvers' and they're used for shaft angular measurements.

As far as why there are no 2 phase power generators.... What would the phase relationship be between the phases? And how would that differ from having just one phase?


Doug

Answer 7

What your professor is calling is amazingly extremely simple. First imagine of a stand DC generator. The winding's will produce a general sinusoidal AC voltage which will then be rectified by using a commutator. So the output will look like a chain of "humps". including an extra beneficial area that's ninety ranges out of area with the first will in basic terms upload yet another set of humps to the output. the overall outcome will create a smother output out of your generator. In software actual DC turbines use 1000's of winding's to create a really tender output. desire this facilitates!