Dead-beat current control method for permanent magnet synchronous servo motor

Abstract

The invention provides a dead-beat current control method for a permanent magnet synchronous servo motor. The method comprises the following steps: (S1) current estimation; (S2) current estimation-based reference voltage calculation; and (S3) rotor motion compensation. The dead-beat current control method has the beneficial effects that a topology of which the other controls can promote mutually in a dead-beat current control and a vector control and the performance and the stability are relatively high is provided by fully considering the characteristics of the vector control and the characteristics of the permanent magnet synchronous servo motor; and the vector control-based potential of the permanent magnet synchronous servo motor is fully developed.

Description

technical field [0001] The invention relates to a current control method, in particular to a dead-beat current control method of a permanent magnet synchronous servo motor. Background technique [0002] Permanent magnet synchronous servo motors are widely used in high-end servo systems due to their high efficiency and high reliability. Vector control is commonly used. Vector control places the current control loop, speed control loop, and position control loop from the inside out. Among them, the current loop control is the most critical in the system, and its performance directly affects the performance of the speed and position loops. The commonly used algorithm of the current loop is PI control, which has the characteristics of simple design and mature technology, and is widely used in the vector control of synchronous and asynchronous motor systems. [0003] Although the PI algorithm has the above advantages, its principle is an algorithm based on deviation adjustment, ...

AI Technical Summary

Problems solved by technology

[0005] 1. In order to get a fast response, a high proportional gain is required to speed up the adjustment and reduce the error, but if the ratio is too large, the system will overshoot, the stability of the overshoot will decrease, and even cause the system to be unstable.

[0006] 2. Integral (I) must be added in order to reduce the steady-state error of the system, but due to the existence of the integral, the system response speed is reduced, and the adjustment time becomes longer

[0007] 3. During the large transient process of the PI system, the system may be saturated due to excessive adjustment, and even cannot work normally

[0008] 4. Due to the integral action, even if the output reaches the set value, the accumulated integral action will cause a large overshoot

[0009] Due to the existence of the above defects, the general-purpose PI controller cannot meet the needs of high-end systems

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