Asymmetric Salient Permanent Magnet Synchronous Machine

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2015-SUDH-67047
Currently, there is great social interest in increasing the efficiency of magnetic power devices, such as electric generators and motors, which are used in applications such as wind energy turbines and hybrid and/or electric vehicles. Numerous ideas have been proposed to improve the efficiency of permanent magnet synchronous machines such as enhanced excitation current control methodologies and a structural modification to the machine. However, improvements are needed to increase efficiency and reduce machine cost.

Researchers at Purdue University have developed a novel permanent magnet synchronous machine (PMSM) architecture that employs rotational asymmetry to reduce machine mass, cost, and loss in constant power variable speed range applications. Structural modifications on the conventional surface mounted permanent magnet synchronous machine were made, resulting in a rotational electromagnetic asymmetry. The asymmetrical salient PMSM increases the torque density production in one mode of operation, energy generation or motoring, while sacrificing it in the other. This technique allows for a reduction in cost for constant power speed range applications. Studies show this technology can reduce cost by up to 18 percent compared to conventional permanent magnet synchronous machines.

Advantages:
-Cost savings up to 18 percent compared to a conventional permanent magnet synchronous machines
-Yields a more favorable trade-off between power loss and machine cost

Potential Applications:
-Magnetic powered devices
-Hybrid/electric vehicles
Jul 1, 2016
Utility Patent
United States
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Jul 2, 2015
Provisional-Patent
United States
(None)
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Purdue Office of Technology Commercialization
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