Generator excitation diagram

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Definition: The system which is used for providing the necessary field current to the rotor winding of the synchronous machine, such type of system is called an excitation system. In other words, excitation system is defined as the system which is used for the production of the flux by passing current in the field winding. The main requirement of an excitation system is reliability under all conditions of service, a simplicity of control, ease of maintenance, stability and fast transient response.

Guide for generator online over and under excitation issues

To ensure stability of power grids, electric generators must be able to do voltage control of the connected power grid. Voltage control is done by producing or absorbing reactive power. Generator operation in the inductive regime (exporting reactive power into the connected grid) is conditioned by the limits of the rotor field current and of the stator current; these limits are established in the reasons of not exceeding the maximum admissible temperatures.


The brushless excitation system works in the absence of commutator, slip rings and brushes. Instead of these components we are using Permanent Magnet Exciter and three phase main Exciter with silicon diode rectifier the system has generated. With this system we can avoid dust particles which cause a great maintenance cost. The complete structure of this excitation system is explained clearly in this review. Drawback of this system is presence of considerable exciter time constant which affects the rate of change of voltage.

Generator excitation diagram

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Rotating equipment is so common, yet so misunderstood, that even highly experienced electricians and engineers are often plagued with questions about their operation. This article will answer seven of the most commonly asked questions. The explanations are brief and practical due to space limitations; however, they will enable you to have a better understanding of this equipment.

“Energy can be converted from one form to other form” – A generator does the same – it converts mechanical energy to electrical energy. Mechanical energy can be created by using water turbines, steam turbines, internal combustion engines etc. And a generator converts this mechanical energy to electrical energy.  Generators can be broadly classified as AC generators and DC generators. Here lets take a look the types of DC generators.

Generator excitation diagram

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The first generator is the exciter (the nose that sticks out the front of the machine). This exciter is actually a 2 kW (kilowatt) DC generator which provides a DC current that is adjusted to control the welder output. The exciter also provides an aux. 115 volts DC for accessories.

Generator excitation diagram

Development of a brushless HTS exciter for a 10 kW HTS synchronous generator

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Generator excitation diagram

What is the function of a diode in a generator? How does it work in the circuit?

There is another diode, which is used in the battery charging application. The DC battery used in DG Sets, is charged using a Dynamo coupled with the Engine flywheel. This dynamo is used to charge the battery and a diode is used between the same, to restrict charging in uni direction.