magnetic Induction is the process by which a voltage also known as electromagnetic force is generated in a circuit when there is a change in magnetic flux. This relationship between the induced voltage and the magnetic flux is known as Faraday's Law.
This discovery led directly to the development of the rotary electric generator, which converts mechanical motion into electric energy, and the electrical transformer.Electromagnetic Induction GeneratorWorking of Electromagnetic Induction GeneratorWe can define an electromagnetic induction generator as a device that converts the mechanical energy of rotating shafts into electricity induced in the coils, the wires all with the help of electric and magnetic effect created in the process.
The potential difference also called electric voltage ( or electromotive force) is induced in a conducting loop (or coil) when there is a change in the number of magnetic field lines (or magnetic flux) passing through the loop. In the device the loop inside which the voltage should be created is closed by connecting the ends through an external load, the induced voltage will cause an electric current to flow through the loop and load.
This process of conversion of rotational energy into electrical energy is achieved henceforth. Indeed, an induction generator can be rendered to operate as a motor or a generator.Electromagnetic Induction GeneratorInduction Generator: ModelInduction generator also has two electromagnetic components: the rotating magnetic field constructed using high conductivity, high strength bars located in a slotted iron core to form a squirrel cage. The above figure shows the construction of a typical induction generator in a cross sectional view. The voltage output from the generator is regulated, multiple phase ac.
The control of the voltage is accomplished in a closed loop operation where the excitation current is adjusted to generate constant output voltage regardless of the variations of speed and load current. The excitation current, its magnitude and frequency is determined by the control system. The excitation current is supplied to the stationary armature winding from which it is induced into the short circuited squirrel cage secondary winding in the rotor.BENEFITS OF INDUCTION GENERATOR TECHNOLOGY:Induction generator has several benefits to offer for the micro, mini power systems under consideration.
These benefits relate to the generator design as follows:Cost of Materials: Use of electromagnets rather than permanent magnets means lower cost of materials for the induction generator.Cost of Labor: Handling of permanent magnets that are pre-charged is generally difficult in production shops.Generator Power Quality: Depending upon the changes in load and speed, the voltage variation can be wide.Fault Conditions: When an internal failure occurs in a PM generator, the failed winding will continue to draw energy until the generator is stopped.