A coaxial rigid coupling structure of a multi-axial flux motor with built-in non-wear bearing

By adopting a coaxial rigid coupling structure with built-in wear-free bearings and a high-strength alloy spindle in the axial flux motor, the problems of processing, transportation and hoisting of high-power motors and the discrete performance of multi-machine coupling are solved, achieving efficient and stable operation and low-cost operation and maintenance.

CN122371583APending Publication Date: 2026-07-10BEIJING DABA ELECTRIC TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING DABA ELECTRIC TECHNOLOGY CO LTD
Filing Date
2026-05-10
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

In existing technologies, axial flux motors have problems such as high processing difficulty, large weight, high maintenance cost, difficulty in axial air gap control, and performance dispersion when multiple machines are coupled, especially the deviation of a single machine caused by the wear of rolling bearings is amplified exponentially by the rigid spindle, making it impossible to achieve stable operation of multiple machines coupled.

Method used

The multi-axial flux motor with built-in wear-free bearings adopts a coaxial rigid coupling structure. Each motor unit is equipped with hydrostatic sliding bearings, magnetic levitation bearings, or magnetic fluid hybrid bearings. Through the rigid coupling structure and high-strength alloy spindle, the consistency of the axial air gap and the synchronization of electromagnetic characteristics of the stator and rotor are ensured throughout the entire life cycle. Active high-pressure oil film realizes metal-free operation.

Benefits of technology

It achieves consistent electromagnetic characteristics and efficient and stable operation of multi-machine coupling systems throughout their entire life cycle, reduces weight and maintenance costs, improves power density and transmission efficiency, solves the processing, transportation and hoisting problems of high-power motors, and is suitable for a variety of high-power application scenarios.

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Abstract

The application discloses a coaxial rigid coupling structure of a multi-axial magnetic flux motor with built-in non-abrasive bearings, and belongs to the technical field of axial magnetic flux motors.The structure is composed of a main shaft, at least two axial magnetic flux motor units capable of independently operating, and a rigid coupling structure with a centering structure, and each motor is provided with an independent non-abrasive bearing set.The core innovation of the application is that the exponential amplification law of the natural adaptability of non-abrasive bearings to axial magnetic flux motors in multi-machine rigid coupling is applied, which not only solves the original contradiction between axial magnetic pull and air gap stability, but also blocks the exponential amplification failure path of the single-machine deviation of the rigid main shaft, and realizes the linear growth of the motor weight with the power.The multi-machine torque consistency deviation of the application is less than or equal to 0.8% in the equivalent 20-year life, the weight reduction of a 10MW-level scheme is 72.3% compared with a traditional radial magnetic flux motor, the single-machine power density is greater than or equal to 2.0kW / kg, and the stator disc diameter is less than or equal to 800mm, so that the application is suitable for high-power scenes such as ship propulsion, wind power, hydroelectric power, and mine machinery.
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