Method for restraining torsional vibration of rotor of motor closed-loop speed control system and circuit thereof

Abstract

The invention relates to a method for restraining the torsional vibration of a rotor of a motor closed-loop speed control system. The method comprises the following steps: (1) collecting a revolving speed signal of the motor rotor through a signal collecting unit, and enabling the revolving speed signal to pass through a band pass filter unit to extract a torsional vibration component signal of the rotor; (2) enabling the torsional vibration component signal of the rotor to pass through a lead-lag unit to regulate the phase position of the torsional vibration signal, and obtaining an electromagnetic torque component signal being phase-opposite with the torsional vibration component signal of the rotor; and (3) regulating the gain amplification times of a gain amplification unit, adding the electromagnetic torque component signal into a revolving speed feedback point through an amplitude limiting unit to generate an electromagnetic torque component being phase-opposite with the torsional vibration signal of the rotor, and therefore effectively restraining the torsional vibration of the motor rotor and power vibration. According to the method, the divergent torsional vibration of the rotor can be restrained, meanwhile the power vibration due to the torsional vibration of the rotor can also be restrained, and the signal collection is simple and convenient. The method has the advantages of simple structure, lower cost, less regulation parameters, easiness in realization and the like and has a larger promotional value.

Description

technical field [0001] The invention relates to a motor speed regulation system, in particular to a method and circuit for suppressing rotor torsional vibration of a motor closed-loop speed regulation system. Background technique [0002] The motor closed-loop speed control system is generally a double-closed-loop speed control system composed of a current inner loop and a speed outer loop. The inner loop is a current regulator to achieve rapid control of the electromagnetic torque, which is generally equivalent to a first-order delay link. The outer ring is the speed regulator, [0003] Generally, a PI regulator is used, and the speed feedback filtering link is equivalent to a first-order delay link. The speed regulator output serves as the input to the current regulator. The motor can be either a DC motor or an AC motor, a synchronous motor or an asynchronous motor. [0004] In some applications of motor closed-loop speed regulation systems, especially in bridge crane...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a method and circuit for suppressing the torsional vibration of the rotor of the motor closed-loop speed regulation system, which solves the common problem of rotor torsional vibration in bridge cranes, rolling mill drives, mine hoists, oil field pumping units and other applications. vibration and power oscillation, the invention can not only suppress the divergent torsional vibration of the rotor, but also suppress the power oscillation caused by the torsional vibration of the rotor, and only need to collect the motor rotor speed signal or motor power signal, and the signal acquisition is simple and convenient

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