New Reaching Law Control for Permanent Magnet Synchronous Motor With Extended Disturbance Observer

Abstract

In order to improve the anti-disturbance performance of permanent magnet synchronous motor (PMSM) servo system, a sliding-mode control strategy using a new reaching law (NRL) is proposed. The NRL incorporates power term and switching gain term of the system state variables into the conventional exponential reaching law (CERL), which can effectively suppress the sliding-mode chattering and increase the convergence rate of system state reaching sliding-mode surface. Based on this new reaching law, a sliding-mode speed controller (SMSC) of PMSM is designed. At the same time, to solve the chattering problem caused by the large sliding-mode switching gain, an anti-disturbance sliding-mode speed controller method with an extended sliding-mode disturbance observer (ESMDO), called SMSC+ESMDO method, is developed. The sliding-mode disturbance observer is designed to accurately estimate the motor speed and external load disturbances, and the disturbance estimator is used as a feed-forward to compensate the sliding-mode speed controller (SMSC) to improve the system robustness and reduce the system chattering. Simulation and experimental results show that the proposed compound sliding-mode control strategy can effectively improve the dynamic performance and robustness of the system compared with the PI controller.

SPMSM Sliding Mode Control Based on the New Super Twisting Algorithm

“…In this paper, the SPMSM is taken as the research object, and its motion equation can be expressed as follows [1]:…”

“…At the same time, when the system state of the linear term ks is close to the sliding mode surface, that is, s < 1, ks reaches 0, the proportional term becomes the square root reaching law α|s| 1/2 sign(s), and there is still the problem of low reaching speed. In order to solve this problem, the adaptive term 1) s is introduced in this paper, and equation ( 16) becomes…”

“…Surface-mounted permanent magnet synchronous motors are widely used in aerospace, numerical control systems, wind power generation, and new energy electric vehicle drive systems due to their high efficiency and small size [1,2]. However, it is a nonlinear, strong coupling, multivariable complex object.…”

Terminal Sliding Mode Control with a Novel Reaching Law and Sliding Mode Disturbance Observer for Inertial Stabilization Imaging Sensor

“…In [20], an improved exponential reaching law was adopted in the permanent magnet synchronous motor control system, and it achieved higher robustness with lower chattering. A sliding-mode control strategy using a new reaching law was proposed in [21]. The new reaching law effectively suppressed sliding-mode chattering and increased the convergence rate of the system state reaching the sliding-mode surface.…”

Comparison analysis of chattering in smooth sliding mode controlled DC-DC buck converter using constant plus proportional reaching law and proposed reaching laws

“…But more switching loss occur due to chattering in system, in turn, high speed switching frequency operation in the switching devices. To the above mentioned problem to alleviate the chattering, a proposed tan hyperbolic reaching law, sigmoid reaching law and constant plus proportional pace reaching law are examined and applied to buck converter [21][22][23].…”