Propulsion motor rotor cooling method and system

By collecting current data and speed information, and combining the ripple speed ratio and back pressure intensity index, the cooling circuit status of the propulsion motor rotor is determined, which solves the problem of inaccurate cooling control at high speeds and improves the thermal safety and reliability of the motor.

CN122052430BActive Publication Date: 2026-07-21SHAANXI LONGYUE RUIXING TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHAANXI LONGYUE RUIXING TECH CO LTD
Filing Date
2026-04-02
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Under high-speed operating conditions, the status of the rotor cooling circuit of the propulsion motor cannot be accurately identified, resulting in inaccurate cooling control and the risk of airlock and electronic oil pump damage.

Method used

By controlling the electronic oil pump controller to collect current data, extract current statistics and fluctuation components, and combine them with the rotational speed to obtain the ripple speed ratio and back pressure intensity index, the vehicle controller is used to determine the cooling circuit status and perform adjustment control, including the determination of hydraulic blockage, medium vaporization and effective circulation status.

Benefits of technology

It enables reliable identification and precise adjustment of the cooling circuit status under low bus frequency conditions, thereby improving the thermal safety boundary and long-term operational reliability of the electric drive system.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application relates to the technical field of motor heat dissipation, in particular to a propelling motor rotor cooling method and system. The present application first controls the electronic oil pump controller to extract current statistical value, current fluctuation component and ripple speed ratio; further compares the propelling motor rotor speed and the electronic oil pump speed in the current control cycle of the vehicle controller to obtain the back pressure intensity index; further obtains the zero back pressure reference current corresponding to the current control cycle, combines the preset back pressure current decay curve to obtain the expected load current; further compares the difference between the current statistical value and the expected load current to obtain the load current deviation; finally determines the cooling circuit state of the propelling motor rotor based on the ripple speed ratio and the load current deviation; and adjusts and controls based on the cooling circuit state of the propelling motor rotor.
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