Brushless DC motor with bearings
AssigneeResMed Motor Technologies Inc.
InventorsDavid B. Sears, Aleksandr Nagorny, Samuel Aziz Mebasser
Life of this patent
Estimating the term…
Abstract
A brushless DC motor including a rotor, a magnet provided to the rotor, a pair of bearings to rotatably support the rotor, a stator assembly that at least partly surrounds the rotor and magnet thereof and adapted to control movement of the rotor, and a bearing tube having an exterior surface and an interior surface that defines a tube interior. The stator assembly is provided along the exterior surface of the tube and the bearings are provided along the interior surface of the tube to support the rotor and magnet within the tube interior. The motor has sample application for use in PAP devices for delivery of positive airway pressure therapy for users or patients.
Claims27
A brushless DC motor, comprising:
- a rotor having a magnet;
- a pair of bearings to rotatably support the rotor;
- a stator assembly adapted to control movement of the rotor;
- and
- a tube provided between the rotor and the stator assembly, the tube providing a one-piece structure having an interior portion and an exterior surface, the stator assembly provided along the exterior surface of the tube and the rotor, the magnet, and the pair of bearings provided within the interior portion of the tube, wherein at least a portion of the tube is sufficiently magnetically transparent to allow a magnetic field to pass between the magnet and the stator assembly,
- wherein the tube includes tapered flange portions adapted to provide snap-in bearing retention.
Dependencies are inferred from the claim text.