![]() In this example using the formula VOLTS time AMP's = Watts it is easy to understand the power potential increase from changing a winding capable or outputting 40 amps versus 10 in a 48 volt application. In this instance using possible a 12 or 24 volt winding which is capable of driving 48 volts at the higher RPM also uses a thicker winding which allows more current to flow. Therefore in the example where a consumer buys a permanent magnet alternator for an application where it is driven by a motor or other high rpm drive system using a 48 volt alternator is a disadvantage. ![]() ![]() All of the alternators have different power output characteristics which are determined mainly by the windings of the particular unit. It is important to understand that just because you have a 48 volt application you do not necessarily want to buy a 48 volt alternator for example. The load on the charging side of the generator is what holds the voltage down. This is rectified externally in Hurricane units to keep the heat build up in a rectifier from decreasing alternator efficiency. All of our alternators and for that matter most on the market period are 3 phase wild AC output with all three legs being hot. This is a solution we employee in applications where the load is not needed to keep the RPM from exceeding excessive conditions to damage wind turbine and or alternators.Īs we began discussing in the previous paragraph it is important to note that the voltage is not regulated within the alternator. In applications where the pma is not being used in a wind application a voltage sensing device can be used and once the full charge state of the battery has been reached a normally closed relay can be set to open. When we get into the longevity of the life of a winding the constant use can produce more heat than in a field wound application wjere the alternator goes through a charging cycle then turns itself off after the battery is full. The downside of this is that the alternator remains under a load constantly so long as wind or water in a hydro application flows. This is typically how it is done in wind turbine applications because many of these machines with enough surface area to generate any real amount of power rely on the turbine to remain under a load to keep the turbine from being damaged by excessive rotation speed. On the downside of that it cannot be turned off which means that it need a controller such as a diversion load to send the power to another source once the battery or source no longer needs power. no energy to energize a field coil so long as there is a source to provide input into the shaft it will produce power. While the permanent magnet alternator has the ability to produce energy from a dead state i.e. This has it's advantages and disadvantages depending on the application. Unlike an basic car alternator which is uses a field coils which is energized by electricity and is turned on and off in a charging system to regulate the voltage a permanent magnet operated alternator does not have the ability to turn on and off. ![]() Most of the pma's and or pmg's depending on which terminology you prefer are rated at a voltage which is realistic to reach a cut in point at an RPM form 150-225 RPM depending on the alternator. The first thing we would like to talk about is the voltage ratings on the turbines. We will not be getting into alternator math and deep technical stuff but find it necessary to write a basic guide on how things work for the 1st time customer who has never has experience with a permanent magnet alternator. Therefore I wanted to take a few moments here to clear up some confusion and direct our customers to the best model for their application. While we have done a lot of youtube videos on this subject which we will embed at the end of this discussion we recognize that as portion of our audience would rather read an article and do not like video. Hi Anthony Jones from Hurricane wind power here and today I wanted to take a few moments and write up a short buying guide for permanent magnet alternators and generators. Permanent magnet alternators and generators Buying guide 2019 to understanding what to buy.
0 Comments
Leave a Reply. |