Dual-rotor, radial-flux, toroidally-wound, permanent-magnet machine
AssigneeWisconsin Alumni Research Foundation
InventorsRonghai Qu, Thomas A. Lipo
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Abstract
The present invention provides a novel dual-rotor, radial-flux, toroidally-wound, permanent-magnet machine. The present invention improves electrical machine torque density and efficiency. At least one concentric surface-mounted permanent magnet dual-rotor is located inside and outside of a torus-shaped stator with back-to-back windings, respectively. The machine substantially improves machine efficiency by reducing the end windings and boosts the torque density by at least doubling the air gap and optimizing the machine aspect ratio.
Claims39
A permanent magnet machine comprising:
- at least one permanent magnet rotor having a generally cylindrical shape with an inner rotor component and an outer rotor component;
- at least one stator having a generally hollow cylindrical shape positioned within an opening between the inner and outer components of the permanent magnet rotor;
- a plurality of polyphase windings of electrical wires wound around the at least one stator;
- and
- a means for reducing cogging torque.
A hybrid permanent magnet machine comprising:
- at least one permanent magnet rotor;
- at least one stator nested within an opening formed between an inner rotor component and an outer rotor component of the at least one permanent magnet rotor creating a rotor-stator-rotor structure;
- a plurality of permanent magnets mounted within the core of the inner rotor component, the permanent magnets having an angular width, and a plurality of permanent magnets mounted to an inner surface of the outer rotor component, the permanent magnets having an angular width;
- a plurality of polyphase windings of electrical wires wound around the at least one stator;
- and
- a means for reducing cogging torque.
Dependencies are inferred from the claim text.