A method and device for obtaining motor parameters

Abstract

Embodiments of the invention provide a method and an apparatus for obtaining motor parameters, and aim to achieve a technical effect of obtaining actual parameters of a motor. The method comprises the steps of obtaining (n-1)th actual q axis current in the (n-1)th period of the motor, wherein n is a positive integer; obtaining (n-1)th putative q axis current output by an adjustable model corresponding to the motor, wherein the (n-1)th putative q axis current is the q axis current output by the adjustable model based on a (n-1)th-round calculation result; obtaining an nth-round calculation result according to the (n-1)th actual q axis current and the (n-1)th putative q axis current, wherein the nth-round calculation result comprises the nth motor parameters or the nth motor parameter correlative; judging whether the nth-round calculation result and the (n-1)th-round calculation result satisfy a preset relation or not; and if so, determining the nth motor parameters corresponding to the nth-round calculation result as the actual parameters of the motor.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a method and a device for obtaining motor parameters. Background technique [0002] At present, when controlling the motor, the motor parameters used are generally the specification parameters provided by the manufacturer, such as the discrete data of the motor inductance changing with the current, the motor resistance and the counter electromotive force constant, etc. However, some motor parameters are not always constant, but are related to the actual operating conditions of the motor, for example, the resistance will increase as the current input to the motor increases. At the same time, the difference between the environment of testing the specification parameters and the actual application environment of the motor may also cause large or small errors between the tested specification parameters and the actual parameters of the motor. The error between the specification p...

AI Technical Summary

Problems solved by technology

However, some motor parameters are not always constant, but are related to the actual operating conditions of the motor, for example, the resistance will increase with the increase of the input current of the motor

At the same time, the difference between the environment of testing specification parameters and the actual application environment of the motor may also lead to large or small errors between the tested specification parameters and the actual parameters of the motor

The error between the specification parameters and the actual parameters causes technical problems such as inaccurate control of the motor, low operating efficiency, and high rotational noise.

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