Motor rotor heat dissipation structure and method based on vacuum cavity in-shaft reflux cooling

By setting a hollow heat dissipation shaft and a spiral guide fluid in the vacuum cavity of the motor rotor shaft, the problem of motor rotor heat dissipation in flywheel energy storage system is solved, achieving efficient motor rotor heat dissipation and ensuring high performance and low cost operation of the system.

CN120728927BActive Publication Date: 2025-11-14JIANGSU JIAOKE ENERGY TECH DEV CO LTD +1
2 Cites 0 Cited by

Patent Information

Application Number
CN202511212303.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-08-28
Publication Date
2025-11-14
Estimated Expiration
2045-08-28

AI Technical Summary

Technical Problem

The motor rotor of the flywheel energy storage system has difficulty dissipating heat effectively in a vacuum environment, resulting in excessively high motor temperature, which affects the life of insulation materials, motor efficiency and the stability of permanent magnets. Existing stator water jacket cooling methods cannot meet the heat dissipation requirements of high-power motor rotors.

Method used

The heat dissipation structure adopts a vacuum chamber shaft recirculation cooling structure. A hollow heat dissipation shaft and a spiral guide fluid are set in the motor rotor shaft to form a spiral guide heat dissipation channel. Heat transfer oil is circulated in the vacuum chamber for heat dissipation, and the oil temperature is further reduced by heat dissipation fins.

Benefits of technology

This achieves efficient motor rotor heat dissipation, ensuring high-performance output of the flywheel energy storage system, reducing production and maintenance costs, and avoiding the use of complex heat dissipation structures.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

This invention discloses a heat dissipation structure and method for a motor rotor based on reflux cooling within a vacuum cavity shaft. The structure includes a flywheel motor water-cooled housing, within which a motor stator, a motor rotor shaft, and a motor rotor are housed. A heat dissipation cover is located at the bottom of the lower end cover. A hollow heat dissipation shaft is interference-fitted into the motor rotor shaft, with its lower end extending into a heat transfer oil storage cavity. Spiral guide fluids are provided on both the inner and outer sides of the hollow heat dissipation shaft, forming a spiral heat dissipation channel between the motor rotor shaft and the hollow heat dissipation shaft. An oil return hole is located at the upper part of the hollow heat dissipation shaft. This invention enables cyclic heat dissipation of the motor rotor by the heat transfer oil, significantly improving the heat dissipation effect of the motor rotor in the flywheel energy storage system, ensuring high-performance output of the flywheel energy storage system. Furthermore, in the high vacuum environment of the flywheel energy storage system, it avoids complex heat dissipation structures, reduces the manufacturing difficulty of the heat dissipation structure, and lowers production and maintenance costs.
Need to check novelty before this filing date? Find Prior Art