Midea Group has patented a counter-rotating motor for high-speed blenders. The motor includes a stator with outer and inner windings, an inverter for synchronous excitation, an inner rotor rotating in one direction, and an outer rotor rotating in the opposite direction. The inverter enables closed-loop vector control for different rotor types. GlobalData’s report on Midea Group 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 Midea Group, Smart climate control systems was a key innovation area identified from patents. Midea Group's grant share as of February 2024 was 70%. Grant share is based on the ratio of number of grants to total number of patents.

High speed blender with counter-rotating motor

Source: United States Patent and Trademark Office (USPTO). Credit: Midea Group Co Ltd

A recently granted patent (Publication Number: US11923734B2) discloses a counter-rotating motor designed with a unique configuration. The motor includes a stator with outer and inner windings, where the phase sequence of the outer winding is reversed compared to the inner winding. An inverter is connected to both windings to supply excitation current synchronously. The motor features an inner rotor that rotates in one direction due to the inner winding and an outer rotor that rotates in the opposite direction due to the outer winding. The inverter enables closed-loop vector control of the rotors, with the first squirrel cage rotor operating in a V/F open-loop control mode.

Furthermore, the patent details a high-speed blender incorporating the counter-rotating motor. The blender includes a first blade connected to the inner rotor and a second blade connected to the outer rotor. These blades can counter-rotate relative to each other, enhancing the blending efficiency. The unique design of the motor and its application in a high-speed blender showcase innovative technology aimed at improving performance and functionality in various applications.

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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.