Method and system for estimating average temperature of windings of a power conversion device for vehicles

CN115051625BActive Publication Date: 2026-06-30SHANGHAI JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI JIAOTONG UNIV
Filing Date
2022-06-07
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing methods for estimating the temperature of stator windings in automotive motors fail to effectively account for the differential resistance of power components in inverters, resulting in errors in temperature feedback and affecting the accuracy of the estimation results.

Method used

By measuring the electrical signals in the vehicle drive system, the various electrical parameters of the inverter and the closed-loop resistance values ​​of the power devices and stator windings are derived and calculated. Combined with the temperature feedback and output characteristic parameters of the power devices, the resistance value and average temperature of the stator windings are calculated.

Benefits of technology

It improves the accuracy of stator winding temperature estimation, reduces system measurement errors, lowers costs, and enables precise identification of motor stator winding resistance and average temperature under specific conditions.

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Abstract

This invention provides a method and system for estimating the average temperature of windings in an automotive power conversion device, comprising the following steps: Step 1: Measuring the electrical signal on the motor side based on a combination sequence of different switching states of the inverter; Step 2: Deriving and calculating various electrical parameters of the power components and the closed-loop resistance values ​​of the power components and stator windings under different connection methods based on the electrical signals measured on the motor side; Step 3: Calculating the resistance value and average temperature of the stator windings based on the temperature feedback and output characteristic parameters of the power components. This invention calculates and derives the stator winding resistance value and the average temperature of the stator windings by measuring the various states of the steady-state phase current, saving costs and reducing system measurement errors introduced by temperature feedback.
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