A method for controlling a variable moment of inertia permanent magnet synchronous motor

Abstract

A method for controlling variable moment of inertia permanent magnet synchronous motor is disclosed. The information of variable moment of inertia factor of permanent magnet synchronous motor load isobtained, the parameter table of variable moment of inertia factor is established, so that that error information is obtain, is corrected according to the empirical parameters of actual products, andis introduced to the control algorithm of the permanent magnet synchronous motor. The method mainly includes the variable moment of inertia factor information parameter acquisition, variable moment ofinertia factor parameter table, current parameter algorithm, variable inertia electromagnetic torque algorithm, variable inertia Laplace algorithm, variable inertia angular velocity algorithm, variable inertia control model. The invention can make the fan realize fast speed convergence, The corresponding time of the input speed of the step response is greatly reduced, the setup time of the speedstabilization is greatly shortened, the ability of resisting external load disturbance of the fan is increased, the downwind startup and the upwind startup are realized, the stable speed operation against the large upwind is realized in the operation process, and the reliability and safety of the operation are enhanced.

Description

technical field [0001] The invention relates to the field of motor control technology, in particular to a control method for a variable moment of inertia permanent magnet synchronous motor. Background technique [0002] Due to the increasing demand for products such as low energy consumption, small space, green energy saving and stepless speed regulation in the refrigeration industry, the traditional AC motor scheme and the inner rotor motor scheme are gradually reduced, while the outer rotor permanent magnet synchronous motor drive shaft The flow fan solution is more and more recognized by the market due to its own characteristics of stepless speed regulation, large torque, integrated design of fan blade and motor, which can reduce space and high efficiency. In addition to many advantages of the outer rotor permanent magnet synchronous fan itself, it also has its shortcomings and difficulties: on the one hand, the diameter of the impeller of the axial flow fan is large, and...

AI Technical Summary

Problems solved by technology

In addition to many advantages, the outer rotor permanent magnet synchronous fan itself also has its shortcomings and difficulties: on the one hand, the large diameter of the impeller of the axial flow fan and the large moment of inertia determine that it is difficult to realize when the fan starts or realizes stepless speed regulation. The rapid convergence of the speed has a large speed fluctuation characteristic and a long time to stabilize the speed, and the speed overshoot is large. The fan installed in the equipment or cooling system is likely to cause resonance with the system, resulting in abnormal vibration or noise , especially the application of multi-fan complete system equipment, its abnormal effect is more obvious, and may even cause the entire system equipment to fail to work normally, and the ability to resist external load interference is weak

On the other hand, the response time of the speed input by the step response is relatively long, and the matching with the moment of inertia part during stepless speed regulation will cause the control system to oscillate, causing the fan to emit abnormal noise in the system

On the other hand, the large starting current impact caused by the large speed overshoot can easily lead to breakdown of power devices or generate high current electromagnetic compatibility interference, which affects the reliability of starting, etc.

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