Embedded Rotor Magnet Layout for Temperature-Stable Demagnetization Resistance

The patent applies local quality by assigning different coercive force requirements to different radial positions of magnets. Magnets at larger radial distances from the stator (first magnets) require higher coercive force to resist demagnetization, while magnets at smaller radial distances (second magnets) can use lower coercive force materials. This localized differentiation optimizes both demagnetization resistance and manufacturing efficiency.

The rotor magnet system is segmented into at least two distinct groups: first magnets positioned at larger radial distances and second magnets positioned at smaller radial distances. Each segment has tailored magnetic properties appropriate to its operational conditions, allowing the system to achieve high demagnetization resistance where needed while simplifying manufacturing in other areas.

The patent implements local quality by matching magnet coercive force to their specific operational environment. Second magnets positioned closer to the stator (smaller radial distance) experience higher reverse magnetic fields but can use materials with lower coercive force since they are less critical for demagnetization resistance. First magnets at larger radial distances use higher coercive force materials to ensure demagnetization resistance, while still maintaining adequate magnetic interaction.

The patent changes the coercive force parameter of magnets based on their radial position. By adjusting this critical material parameter according to location, the system optimizes the balance between magnetic interaction efficiency (requiring strong magnets near the stator) and demagnetization resistance (requiring high coercive force magnets at larger radial distances).