Gree Electric Appliances Inc of Zhuhai has been granted a patent for a rotor assembly and motor. The rotor assembly includes a rotor body with magnetic poles arranged uniformly along its circumference. Each magnetic pole has a filling slot filled with conductive and magnetic isolation material. The filling slots are arranged in a specific order and form a magnetic flux channel parallel to the q-axis. The rotor assembly also includes a slit slot and multiple filling slots, with the number of filling slots being twice the number of slit slots. The patent aims to improve the efficiency and performance of motors. GlobalData’s report on Gree Electric Appliances Inc of Zhuhai 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 Gree Electric Appliances Inc of Zhuhai, smart climate control systems was a key innovation area identified from patents. Gree Electric Appliances Inc of Zhuhai's grant share as of September 2023 was 59%. Grant share is based on the ratio of number of grants to total number of patents.

The patent is granted for a rotor assembly with magnetic poles and filling slots

Source: United States Patent and Trademark Office (USPTO). Credit: Gree Electric Appliances Inc of Zhuhai

A recently granted patent (Publication Number: US11777346B2) describes a rotor assembly for a motor. The rotor assembly includes a rotor body with multiple magnetic poles arranged uniformly along the circumference. Each magnetic pole has a filling slot filled with a conductive and magnetic isolation material. The filling slots are arranged in a specific order along the circumference, with the first sidewall of each slot parallel to the second sidewall of the adjacent slot, creating a magnetic flux channel parallel to a q-axis. The magnetic poles also have slit slots separated from the filling slots. The number of second filling slots is twice the number of slit slots, and the distance between the first filling slot and the adjacent second filling slot is smaller than the distance between adjacent second filling slots.

The patent also discloses additional features of the rotor assembly. There is a distance between the filling slot and the outer peripheral wall of the rotor body. In each magnetic pole, there can be at least two slit slots arranged at intervals along the d-axis, with the distance between the first filling slot and the adjacent slit slot smaller than the distance between adjacent slit slots. The patent further describes configurations with at least three slit slots, where the distances between adjacent slit slots decrease successively away from the axis of the rotor body. The distances between adjacent second filling slots can also increase successively away from the first filling slot.

The rotor assembly may include a conductive ring fixedly connected to an axial end of the rotor body. The conductive ring is attached to the conductive and magnetic isolation material in the filling slots, allowing conduction through the ring. A magnetic isolation material can be provided in the slit slot. The rotor assembly can be used in a motor, where the rotor body passes through a mounting hole in the stator. The distance between the outer wall of the rotor body and the inner wall of the mounting hole is denoted by H. The rotor body has filling slots at the ends of the slit slots, with a minimum distance denoted by L between the slit slot and the corresponding second filling slots.

Overall, this patented rotor assembly design offers specific arrangements of magnetic poles, filling slots, and slit slots, providing improved performance and efficiency in motors.

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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.