Permanent Magnet Motor for Electric Vehicles

The Problem:
Electric and hybrid electric vehicles use a permanent magnet structure to run their electric motors: permanent magnets are arranged so as to spin in reaction to changes in current and temporary magnetic fields. With current designs, there is a phenomenon caused torque ripple which causes unwanted noise, vibration, harshness, low fuel efficiency, and low durability of car components. Additionally, electric motors used in electric vehicles use expensive rare-earth metals in order to function as permanent magnets.

The Solution:
Researchers at the University of Alabama have developed a novel spoke construction of permanent magnets for electric motors. Through magnetic topographical analysis, an optimal arrangement of permanent magnets (that do not need to be rare-earth metals) and air gaps in the motor has been achieved. This rearrangement of components in the electric motor setup decreases torque ripple by 55% over current technology and increases total average torque by 7%. This technology provides cost benefits through use of less expensive magnets but it also creates an increase in overall motor efficiency.

Benefits:
• Decreases torque ripple by 55%.
• Increased total average torque by 7%.
• Reduced cost of electric motor without use of Rare-Earth metals (increasingly expensive).
• Technology used in the majority of electric motor vehicles.
• Less expensive, more efficient.

VIEW PATENT HERE
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Website

https://ua.technologypublisher.com/technology/48618

Contact Information

TTO Home Page: https://ua.technologypublisher.com

Name: Nghia Chiem

Email: nchiem@ua.edu