A Control Method of Permanent Magnet Synchronous Motor with Variable Moment of Inertia

Abstract

The invention discloses a method for controlling a permanent magnet synchronous motor with variable rotational inertia. The method is mainly to establish a variable rotational inertia factor parameter table by acquiring the variation factor information of the variable rotational inertia of the permanent magnet synchronous motor load, obtain its error information, and combine the actual The empirical parameters of the product are corrected and introduced into the control algorithm of the permanent magnet synchronous motor, which mainly includes the acquisition of the variable factor information parameter of the variable inertia, the variable inertia factor parameter table, the current parameter algorithm, the variable inertia electromagnetic torque algorithm, and the variable inertia. Laplace algorithm, variable inertia angular velocity algorithm, variable inertia control model. The invention can make the fan realize rapid speed convergence, greatly reduce the speed response time of the step response input, greatly shorten the establishment time of the speed stability, increase the anti-interference ability of the external load of the fan, and realize the downwind start and the headwind start. The anti-wind and stable speed operation during operation enhances the reliability and safety of operation.

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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