Inductance identification method and system of permanent magnet synchronous motor, medium and terminal

Abstract

The invention provides an inductance identification method and system of a permanent magnet synchronous motor, a medium and a terminal. The method comprises the following steps: injecting a first square-wave high-frequency voltage to a direct axis of the permanent magnet synchronous motor, and / or injecting a second square-wave high-frequency voltage to a quadrature axis of the permanent magnet synchronous motor; acquiring a first direct-axis feedback current based on the first square-wave high-frequency voltage, and / or acquiring a first quadrature-axis feedback current based on the second square-wave high-frequency voltage; and calculating the direct-axis inductance of the permanent magnet synchronous motor based on the first square wave high-frequency voltage and the first direct-axis feedback current, and / or calculating the quadrature-axis inductance of the permanent magnet synchronous motor based on the second square wave high-frequency voltage and the first quadrature-axis feedback current. The square-wave high-frequency voltage is injected into the direct axis and / or the quadrature axis of the permanent magnet synchronous motor, the injection frequency can reach the kilohertz level and even the switching frequency, the equivalent inductive reactance is large, the component occupied by the resistor is greatly reduced, the influence of the resistor can be further ignored, and then the accuracy and reliability of inductance identification of the permanent magnet synchronous motor are improved.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet synchronous motors, in particular to an inductance identification method, system, medium and terminal of permanent magnet synchronous motors. Background technique [0002] The permanent magnet synchronous motor has the advantages of small size, high efficiency and high power factor, and has been widely used in various power transmission industries. Not only need to know the rotor position information, but also need to carry out the current loop control, due to the limitation of cost and application environment, the rotor position information is more and more popular to use the position sensorless control method to obtain, this kind of position sensorless control method and the current loop control have great influence on The motor parameters (resistance and inductance) have a strong dependence. The accuracy of the motor parameters directly affects the accuracy of the position and the perf...

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Problems solved by technology

[0008] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an inductance identification method, system, medium and terminal for permanent magnet synchronous motors, which are used to solve the problem of identifying permanent magnet synchronous motors using sinusoidal high-frequency injection methods. Inductance, there is a problem that the inductance parameter deviation is large due to the low injection frequency

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