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US 11,271,510 B1Granted
Electric motor with shielded phase windings
AssigneeApple Inc.
InventorsLi Niu, Dillon J. Thomasson, Kan Zhou, David F. Nelson, Rui Guan
Life of this patent
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Abstract
An electric motor includes a configuration that directs at least a portion of an electric field generated by phase windings into a stator.
Claims20
An electric motor, comprising:
- a rotor that extends along a rotation axis and has an outer periphery;
- a stator;
- slots formed in the stator;
- phase windings connected to the stator and disposed at least partially in the slots, wherein the phase windings are energized and de-energized to induce torque on the rotor by interaction of magnetic fields generated by the phase windings with the rotor to cause rotation of the rotor around the rotation axis;
- and
- a shield that is positioned between the rotor and the phase windings and is positioned adjacent to a radial air gap between the stator and the rotor and directs at least a portion of an electric field generated by the phase windings into the stator to at least partially shield the rotor from the electric field generated by the phase windings.
3 more elements
An electric motor, comprising:
- a rotor;
- a stator having an inner periphery;
- slots formed in the stator;
- phase windings connected to the stator and disposed at least partially in the slots;
- insulating elements each disposed in one of the slots between the phase windings and the rotor, wherein the insulating elements do not readily conduct an electric field generated by the phase windings;
- and
- a shield layer disposed on the insulating element to direct at least a portion of the electric field generated by the phase windings into the stator, wherein the shield layer is a coating that is disposed on the inner periphery of the stator and the insulating element.
4 more elements
An electric motor, comprising:
- a rotor;
- a stator that extends around the rotor;
- slots formed in the stator;
- brackets connected to the stator such that one of the brackets is disposed in each of the slots;
- phase windings that are each wound around one of the brackets such that they are each disposed in one of the slots;
- and
- a shield layer that is disposed on the brackets and is in contact with the stator to direct at least a portion of an electric field generated by the phase windings into the stator.
4 more elements
Dependencies are inferred from the claim text.