Motor parameter estimation method and system based on thermal resistance network model

Abstract

The invention discloses a motor parameter estimation method and a motor parameter estimation system based on a thermal resistance network model. The motor parameter estimation method comprises the steps of: analyzing process data of heat transfer of a motor, and constructing the thermal resistance network model according to the process data; acquiring state variables and input variables accordingto the thermal resistance network model, acquiring loss power data according to the state variables and input variables, and acquiring a state equation; performing offline identification on thermal resistance network state parameters in the state equation by means of multiple linear regression; and acquiring motor temperature data, and estimating motor parameters according to the motor temperaturedata and the thermal resistance network state parameters. The motor parameter estimation method and the motor parameter estimation system solve the technical problems that result precision is restricted by the number of orders of a model, the detection precision is low, and the practicability is low due to high dependence on motor structural parameters in the traditional technology.

Description

technical field [0001] The invention relates to a motor parameter detection method, in particular to a motor parameter estimation method and system based on a thermal resistance network model. Background technique [0002] Compared with traditional electric excitation motors, permanent magnet synchronous motors have many advantages such as simple structure, strong reliability, and high power density, so they are widely used in the field of new energy vehicles. Permanent magnet synchronous motor overheating failure is a common cause of motor damage. On the one hand, during the long-term operation of the motor, a large amount of heat is accumulated in the stator winding due to Joule loss in the stator of the motor, which can easily cause the winding to burn out. On the other hand, due to the existence of iron core loss, when the motor is running at high speed, eddy current and hysteresis loss will also lead to an increase in the temperature of the permanent magnet. loss of m...

AI Technical Summary

Problems solved by technology

[0004] In view of the technical problems of low transaction security and low identity authentication accuracy in the above prior art, the purpose of the present invention is to provide a method and system for estimating motor parameters based on a thermal resistance network model to solve the problem of result accuracy in the prior art A method for estimating motor parameters based on a thermal resistance network model, including:

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