Rotary Transformer for Brushless and Permanent Magnet–Free Electric Motors
Category: IT/Electrical
Developers: Oak Ridge National Laboratory
Product Description:Over 90% of Electric Vehicles use permanent-magnet synchronous motors, and China supplies 98% of the critical rare-earth magnets in these motors. Wound-rotor synchronous motors eliminate magnets and use brushes and slip rings but introduce other problems. Our technology eliminates magnets, brushes and slip rings, thereby improving efficiency and sustainability. The technology developed by ORNL and BorgWarner provides a significant improvement for EVs and industrial motors. This technology eliminates the problems associated with the brush and slipring systems while also eliminating heavy and non-heavy rare earth materials from the electric motors. It also replaces brush and slip-ring systems with wireless and noncontact delivery of excitation current to the wound-field rotor. This approach reduces the dependency on other countries’ resources in the US transportation sector. It enables higher-speed operation, increases efficiency, eliminates maintenance requirements and reduces the motor size, weight and volume. Moreover, this technology is applicable to light-, medium- and heavy-duty vehicles and electric vertical takeoff and landing vehicles, which use a considerable amount of magnets. Proposed technology eliminates the maintenance requirements, provides speed and operating point independent high efficiency, enables high-speed operation and improves power density of WRSM for EVs with increased performance and efficiency while eliminating the dependency on another country’s resources in our transportation and vehicles industry.
Developers: Oak Ridge National Laboratory
Product Description:Over 90% of Electric Vehicles use permanent-magnet synchronous motors, and China supplies 98% of the critical rare-earth magnets in these motors. Wound-rotor synchronous motors eliminate magnets and use brushes and slip rings but introduce other problems. Our technology eliminates magnets, brushes and slip rings, thereby improving efficiency and sustainability. The technology developed by ORNL and BorgWarner provides a significant improvement for EVs and industrial motors. This technology eliminates the problems associated with the brush and slipring systems while also eliminating heavy and non-heavy rare earth materials from the electric motors. It also replaces brush and slip-ring systems with wireless and noncontact delivery of excitation current to the wound-field rotor. This approach reduces the dependency on other countries’ resources in the US transportation sector. It enables higher-speed operation, increases efficiency, eliminates maintenance requirements and reduces the motor size, weight and volume. Moreover, this technology is applicable to light-, medium- and heavy-duty vehicles and electric vertical takeoff and landing vehicles, which use a considerable amount of magnets. Proposed technology eliminates the maintenance requirements, provides speed and operating point independent high efficiency, enables high-speed operation and improves power density of WRSM for EVs with increased performance and efficiency while eliminating the dependency on another country’s resources in our transportation and vehicles industry.
