Magnets Generate More Electricity in Generators
Purdue University researchers have developed a parallel arrangement of inner magnets to reduce size and increase the efficiency of low- to medium-power generators. Source: Purdue University
Generators have many uses, from cars to airplanes to microgrids. There is currently a strong desire to reduce size and increase efficiency of equipment.
Researchers at Purdue University have come up with an effective way to reduce the size and increase the efficiency of the medium- to low-power generators used in these applications.
There is a set of magnetic field windings (a set of insulated current-carrying coils) on the rotor of the wound rotor synchronous machine to generate a rotating magnetic field and adjust the output voltage. Associated with this winding are losses, which generate heat that must be removed from the spinning rotor. Permanent magnets can also be used to generate a magnetic field with much less loss and heat, but this method is less convenient for output voltage regulation.
“The Purdue parallel in-magnet setup is a hybrid solution that creates some permanent magnets and a winding magnetic field,” said Scott Sudhoff, the Michael and Katherine Birck Professor of Electrical and Computer Engineering in Purdue’s College of Engineering. “This allows regulation, but with lower losses compared to conventional machines.” Magnets Generate Electricity
Omar Laldin, a former Sudhoff doctoral student who helped lead the Purdue team that invented the inner magnet device. The device can be used in a variety of AC and DC (with rectifier) generator applications, Sudhoff said. Sudhoff said. The unit can be used in a variety of AC and DC (with rectifier) generator applications. Key issues include the issue of optimal machine architecture in terms of fusing these two field sources, electromagnetic damping and fault performance. The team has validated the design code with tests based on finite element analysis. Magnets Generate Electricity
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