It seems like you might be referring to a "Squirrel Cage Induction Generator" (SCIG) in the context of AC power systems. An induction generator is a type of asynchronous generator that can convert mechanical energy into electrical energy in AC power systems. Here's how it generally works:
Basic Principle of Induction: An induction generator operates on the principle of electromagnetic induction. When the rotor of the generator (often referred to as the "squirrel cage" due to its shape) is rotated by an external mechanical force, it induces a changing magnetic field in the stator windings.
Rotor Movement: In the case of a squirrel cage induction generator, the rotor consists of short-circuited bars or conductors that resemble a squirrel cage. As the rotor spins, the relative movement between the rotating magnetic field produced by the rotor and the stationary stator windings induces a voltage in the stator coils.
Voltage Induction: The changing magnetic field in the stator windings induces a voltage, following Faraday's law of electromagnetic induction. This induced voltage causes current to flow through the stator windings.
AC Power Generation: The current flowing through the stator windings produces an alternating magnetic field, which interacts with the rotor's magnetic field. Due to the differences in frequency and phase between the stator and rotor fields, a torque is generated, causing the rotor to keep turning.
Mechanical to Electrical Conversion: The mechanical energy supplied to the rotor is effectively converted into electrical energy through this continuous process of electromagnetic induction, where the relative motion between the rotor and stator fields creates a flow of electrical current in the stator windings.
Output Power and Frequency: The frequency of the generated electrical output is determined by the speed of the rotor and the number of poles in the generator. The output voltage and frequency may need to be regulated using control mechanisms to match the requirements of the AC power system.
It's important to note that while induction generators like SCIGs are relatively simple and rugged, they are less controllable than synchronous generators, which are more commonly used in utility-scale power generation due to their ability to maintain precise frequency and voltage levels.
In summary, a squirrel cage induction generator converts mechanical energy into electrical energy through the principles of electromagnetic induction, where the movement of the rotor's magnetic field induces a voltage in the stator windings, leading to the flow of electrical current and the generation of AC power.