Magic Leap has been granted a patent for an annular axial flux motor that features a rotor with Halbach arrays of permanent magnets and a stator with multiple layers of printed electrical windings. The design allows for constant torque generation within a finite travel range. GlobalData’s report on Magic Leap gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Magic Leap, Smart glasses was a key innovation area identified from patents. Magic Leap's grant share as of April 2024 was 55%. Grant share is based on the ratio of number of grants to total number of patents.
Annular axial flux motor with symmetrical magnetic field
A recently granted patent (Publication Number: US11973375B2) discloses an annular axial flux motor design that features a rotor with an array of permanent magnets mounted on a limited arc length subsection of a rotatable structure. The stator, on the other hand, comprises multiple layers of printed electrical windings on a printed circuit board (PCB) mounted on a corresponding subsection of a carrier. The motor is designed to generate a torque to drive the rotor within a finite travel range, with the electrical windings and permanent magnets configured to interact in a specific manner to achieve efficient operation. The patent also details the use of a Halbach array for the permanent magnets, with specific arrangements of magnet pole pairs to enhance performance.
Furthermore, the patent describes a system incorporating the annular axial flux motor, along with additional components such as a shaper ring and a flexible lens membrane. The system allows for the generation of a constant torque to drive the rotor, with the stator comprising 2-phase electrical windings driven by sinusoidal currents with a phase difference of p/2. The method outlined in the patent involves inputting drive currents into different phase electrical windings to achieve rotational motion of the rotor, along with axial motion of the shaper ring resulting in a curvature change of the flexible lens membrane. Overall, the patent showcases an innovative design for an annular axial flux motor system with various applications and unique features aimed at improving efficiency and performance.
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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.
GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
