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Synchronous Generators

Like most electrical machines, the permanent magnet synchronous machines (see the section dedicated to Brushless Motors), are also completely reversible in their use as motors. For this reason, these machines can be efficiently used as generators of electricity.

IME permanent magnet synchronous machines can be used interchangeably as motors or as electric generators and, as shown below, are perfectly suited for use as generators from renewable energy sources such as wind power (from a few hundred watts up to megawatts) or in turbine generation systems (mini and micro-hydraulic, bio-gas, etc.).

Other fields of application in which the reversibility of IME permanent magnet synchronous machines is profitably exploited, are those of electric traction, especially in its hybrid forms, and hoisting rope systems.

The IME range currently includes three-phase “Direct Drive" permanent magnet synchronous generators with power ranges between 0.2 kW and 20kW.
The main advantages of IME permanent magnet synchronous motors are:

  • High flux density in the air gap, through the use of high-energy magnets;
  • High power to weight ratio, therefore much more compact when compared to an equivalent power induction motor.
  • Large torque to inertia ratio, which ensures high accelerations and makes them suitable for high speed applications;
  • Small torque oscillations even at very low speeds, which allows remarkable accuracy in positioning and motion control, therefore particularly suitable for "Direct Drive" applications;
  • A wide range of speed variations, thanks to the possibility of checks in defluxing;
  • Ability to operate at high torques, which allows rapid acceleration and deceleration;
  • High efficiency and high power factor, due to the presence of an intrinsic magnetic field in the rotor structure due to the permanent magnets;
  • Very compact structure, therefore high torque/volume ratio

Applications

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