Toshiba has filed a patent for an embedded magnet rotor design. The rotor includes a rotor shaft, a rotor core with electromagnetic steel sheets, permanent magnet housing holes arranged in a V-shape, plate-shaped permanent magnets, and two end plates to prevent protrusion. The design allows for improved communication between the permanent magnet housing holes and the outer peripheral surface of the rotor core. Additionally, connection portions are included to connect the electromagnetic steel sheets near the end plates. GlobalData’s report on Toshiba 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 Toshiba, Battery management systems was a key innovation area identified from patents. Toshiba's grant share as of September 2023 was 26%. Grant share is based on the ratio of number of grants to total number of patents.
Embedded magnet rotor with permanent magnets and connection portions
The filed patent (Publication Number: US20230318379A1) describes an embedded magnet rotor for a rotary electric machine. The rotor includes a rotor shaft and a rotor core made up of electromagnetic steel sheets attached to the outer side of the rotor shaft. The rotor core has two permanent magnet housing holes arranged in a V-shape across each d axis. Plate-shaped permanent magnets are housed in these holes. The rotor also includes two end plates that are smaller in outside diameter than the rotor core and are placed at the ends of the electromagnetic steel sheets to prevent the permanent magnets from protruding outward. The permanent magnet housing holes are connected to the outer side of the rotor core, and the electromagnetic steel sheets near the end plates have connection portions for joining them together.
In one embodiment, the end plates are larger in outside diameter than the radially outermost envelope cylinder of the permanent magnets housed in the rotor core. This ensures that the end plates provide sufficient coverage and protection for the permanent magnets.
The connection portions of the electromagnetic steel sheets near the end plates can be caulked portions, welded portions, or bonded portions. These connection portions help in securely joining the electromagnetic steel sheets together.
The patent also describes a rotary electric machine that includes the embedded magnet rotor and a stator positioned on the radially outer side of the rotor core. This configuration allows for efficient operation of the rotary electric machine.
Overall, the embedded magnet rotor described in the patent provides a robust and efficient design for a rotary electric machine. The use of permanent magnets housed in the rotor core, along with the connection portions and end plates, ensures the stability and protection of the rotor components. This design can be implemented in various applications requiring rotary electric machines.
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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.
