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Induction Generators

By Author: toshniwal
Total Articles: 24

INDUCTION GENERATORS
Induction generators are the ideal solution for inductive heating and heat treatment. Their uses ranges from classic applications like hardening, annealing, soldering, melting, and forging, right up to special applications like epitaxy and crystal growing according to the Czochralski process.
Working Principal
An induction generator produces electrical power when its rotor is turned faster than the synchronous speed. For a four-pole motor operating on a 60 Hz electrical grid, the synchronous speed is 1800 rpm. The same four-pole motor operating on a 50 Hz grid will have a synchronous speed of 1500 RPM. The motor normally turns slightly slower than the synchronous speed; the difference between synchronous and operating speed is called "slip" and is usually expressed as per cent of the synchronous speed.
In normal motor operation, the stator flux rotation is faster than the rotor rotation. This causes the stator flux to induce rotor currents, which create a rotor flux with magnetic polarity opposite to stator. In this way, the rotor is dragged along behind stator flux, with the currents in the rotor induced at the slip frequency.
In generator operation, a prime mover (turbine or engine) drives the rotor above the synchronous speed (negative slip). The stator flux still induces currents in the rotor, but since the opposing rotor flux is now cutting the stator coils, an active current is produced in stator coils and the motor now operates as a generator, sending power back to the electrical grid.

FEATURES
• The amount of space required is low, which means it can be easily integrated in any application environment
• Construction with separate parallel oscillating circuit enables flexible arrangement- a distance of up to 82 feet can be achieved between the generator and the application
• Parallel oscillating circuit technology reduces setup times, improves productivity, and extends the application spectrum
• As a result of flexible power control from almost 0% to 100%, temperature-controlled processes can be optimally controlled using the TruHeat MF Series 3000 / 5000 / 7000 generators.
• Reliability and long-term stability in operation guarantee a high level of productivity and reproducibility of the results.
Applications
• Classic applications like hardening, annealing, soldering, melting and forging
• Artificial manufacture of Crystals like crucible pulling as per Czochralski process
• Epitaxy: Deposition of single crystal layers on a substrate of same material. eg. LED manufacture

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