Permanent magnet synchronous motor flux linkage and temperature estimation method

Abstract

The invention discloses a permanent magnet synchronous motor flux linkage and temperature estimation method, and the method comprises the steps: 1, achieving the repeated sampling in one control period through a microcontroller in the operation process of a permanent magnet synchronous motor, and obtaining a motor flux linkage parameter; 2, under the working condition that id is equal to 0, usinga finite element current-inductance Table for replacing fixed motor parameters, obtaining inductance parameters changing along with the current, then correcting the motor flux linkage parameters in the step 1, and obtaining a more accurate motor flux linkage estimation result; 3, under the working condition that id is not equal to 0, considering an inductive coupling term, and then correcting themotor flux linkage parameters in the step 1 to obtain a more accurate motor flux linkage estimation result; and 4, estimating the rotor temperature of the permanent magnet synchronous motor accordingto the more accurate motor flux linkage estimation result obtained in the step 2 or the step 3. The method is simple, convenient and easy to complete, and real-time estimation of motor flux linkage parameters and temperature with smaller errors can be realized without injecting current.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a flux linkage and temperature estimation method of a permanent magnet synchronous motor. Background technique [0002] Rare earth permanent magnet materials can significantly reduce the volume of the motor and increase the power density due to their high magnetic energy characteristics, so permanent magnet synchronous motors are widely used in wind power generation, electric vehicles, military industry, aerospace and other critical field. However, the performance of rare earth permanent magnet materials is highly affected by temperature. Exceeding the limit of permanent magnet temperature will lead to irreversible demagnetization of permanent magnets, which will seriously affect the performance of permanent magnet synchronous motors. Therefore, it is extremely important to estimate the temperature of the permanent magnet of the rotor in real time. However, the rotor of th...

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Problems solved by technology

[0004] In view of this, the present invention provides a simple, accurate, and easy-to-complete method for estimating the rotor flux and temperature of a permanent magnet synchronous motor, which solves the problem of traditional rotor flux and temperature estimation during the rotation of the permanent magnet synchronous motor rotor. The method has problems such as inaccurate temperature estimation, influence by motor inductance parameters, and difficulty in implementation.

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