Permanent magnet synchronous motor weak magnetic area efficiency optimal control current track searching method and online control method

Abstract

The invention discloses a permanent magnet synchronous motor weak magnetic area efficiency optimal control current tracksearch method and an online control method, belongs to the field of motors, andaims to solve the problems that a traditional weak magnetic area efficiency optimal control algorithm uses fixed parameter values for calculation, the current trackdeviation is large, and accurate weak magnetic area efficiency optimal control cannot be realized. The method is realized as follows: under a given torque instruction, a rotating speed instruction, a voltage limit and a current limit, obtaining a current working point with the minimum current amplitude as a current track with the optimal efficiency control in a weak magnetic region; the method comprises weak magnetic current angle iteration and current amplitude iteration, wherein the weak magnetic current angle iteration is carried out firstly, and the iteration direction is the direction in which the current amplitude is reduced under the voltage limit; and in the iteration process, current amplitude iteration is nested to determine the current amplitude corresponding to each current angle, the iteration direction is the direction in which the error between the given torque and the actual torque is reduced, and the current track with the optimal efficiency control in the weak magnetic region is output after iteration convergence.

Description

technical field

[0001] The invention relates to a current trajectory search algorithm for the optimal control of the efficiency in the field-weakening area of ​​a permanent magnet synchronous motor, a nonlinear flux linkage model of a permanent magnet synchronous motor, and an online method for optimizing the efficiency of the field-weaking area of ​​a permanent magnet synchronous motor based on a neural network. The invention relates to a control algorithm, which belongs to the field of motors. Background technique

[0002] In recent years, the number of traditional automobiles has increased sharply, which has caused increasingly serious environmental pollution problems, and has gradually become one of the important factors that exacerbate global warming and the greenhouse effect. At the same time, traditional automobiles use internal combustion engines, which have a low energy conversion rate and rely heavily on non-renewable resources such as petroleum. The dual pressures...

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