Gree Electric Appliances Inc of Zhuhai has filed a patent for a rotor structure, electric motor, and rotor manufacturing method. The rotor structure includes stacked rotor sheets with a shaft hole, first slot, and first filling slots. The first slot extends in the direction of the rotor structure’s direct axis and includes slot sections on opposite sides of the shaft hole. The rotating shaft passes through the shaft hole, first slot, and first filling slots to form a first flux barrier layer. 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.
A rotor structure with stacked sheets and flux barrier layer
A recently filed patent (Publication Number: US20230308001A1) describes a rotor structure for an electric motor. The rotor structure consists of multiple rotor sheets stacked along the axial direction. Each rotor sheet has a shaft hole, a first slot, and first filling slots at both ends of the first slot. The first slot extends in the direction of the rotor's axis and includes slot sections on either side of the shaft hole.
The patent also mentions that the rotor structure can have two rotor poles arranged in pairs. The rotating shaft of the rotor can be made of a magnetically non-conductive material, and its outer peripheral surface can be cylindrical or a part of a cylindrical surface.
The distance between each slot section and the shaft hole (L1) is specified to be within a range of s=L1=5s, where s represents the width of the air gap between the stator's inner diameter and the rotor's outer diameter. Similarly, the minimum distance between each slot section and an adjacent first filling slot (L2) is defined as 0.8s=L2=2s, or L2=0.
The slot sections and first filling slots can be filled with the same material or left as air-filled slots. The slot sections are rectangular, and their minimum width (h1) is within the range of 0.9h2=h1=1.1h2, where h2 represents the width of the first filling slots adjacent to the slot sections.
The rotor structure may also include groups of second flux barrier layers located on opposite sides of the first flux barrier layer. Each group of second flux barrier layers consists of multiple layers arranged in the direction of the rotor's quadrature axis. These layers have second slots and second filling slots at both ends of the second slot.
The patent further describes various aspects of the rotor structure, including the width and arrangement of the second slots and second filling slots, the distance between adjacent second flux barrier layers, and the presence of a third flux barrier layer with a third filling slot.
The rotor structure described in the patent can be used in an electric motor, where it interacts with a stator to generate rotational motion.
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