A New Type of Sliding Mode Observer for Permanent Magnet Synchronous Motor Control

Abstract Aiming at the high-frequency oscillation and estimation accuracy problems of traditional sliding mode observers in the control process of permanent magnet synchronous motors, a sensorless control method for permanent magnet synchronous motors based on a new approaching law sliding mode observer is proposed. Based on the construction of a permanent magnet synchronous motor two-phase static coordinate system model, a sliding mode observer is used to estimate the back electromotive force, and then the rotor speed and position information are obtained. Finally, a simulation experiment is carried out. The results show that the new sliding mode observer based on the new approaching law effectively reduces the high frequency chattering of the system, improves the estimation accuracy of the system, and has better control performance.

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An Improved Super-Twisting High-Order Sliding Mode Observer for Sensorless Control of Permanent Magnet Synchronous Motor

Energies ◽

10.3390/en14196047 ◽

2021 ◽

Vol 14 (19) ◽

pp. 6047

Author(s):

Yujiao Zhao ◽

Haisheng Yu ◽

Shixian Wang

Keyword(s):

Permanent Magnet ◽

High Performance ◽

Sliding Mode ◽

Sensorless Control ◽

Permanent Magnet Synchronous Motor ◽

High Order ◽

Sliding Mode Observer ◽

Estimation Accuracy ◽

Permanent Magnet Synchronous Motors ◽

Rotor Position

This article presents an improved super-twisting high-order sliding mode observer for permanent magnet synchronous motors to achieve high-performance sensorless control. The proposed observer is able to simultaneously estimate rotor position and speed, as well as track parameter disturbances online. Then, according to the back-EMF model, the sensorless observer is further constructed to improve the estimation effect. The estimated rotor position and speed are used to replace the actual values detected by the sensor, and the estimated parameter disturbances are considered as feedback values to compensate the command voltage. In this way, not only is the estimation accuracy improved, but the robustness against uncertainties is also enhanced. Simulation and experimental results show that the proposed observer can effectively track the rotor position and speed and obtain good dynamic and steady-state performance.

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Sensorless Control Strategy of a Permanent Magnet Synchronous Motor Based on an Improved Sliding Mode Observer

World Electric Vehicle Journal ◽

10.3390/wevj12020074 ◽

2021 ◽

Vol 12 (2) ◽

pp. 74

Author(s):

Wengen Gao ◽

Gang Zhang ◽

Mengxun Hang ◽

Sirui Cheng ◽

Pengfei Li

Keyword(s):

Permanent Magnet ◽

Control Strategy ◽

High Frequency ◽

Sliding Mode ◽

Estimation Error ◽

Permanent Magnet Synchronous Motor ◽

Synchronous Motor ◽

Sliding Mode Observer ◽

Phase Delay ◽

Sigmoid Function

This paper analyzes the problems and the reasons of high frequency chattering, phase delay, unmanageable with low-speed rotation in the traditional SMO control strategy of the sensor-less control strategy of a permanent magnet synchronous motor based on the traditional sliding mode observer. Aiming at the shortcomings of the above-mentioned traditional SMO control strategy, an improved SMO control strategy is presented by replacing the signum function in the traditional synovial observer with the sigmoid function to reduce the high frequency chattering of the system. Meanwhile, the proposed improved SMO control strategy introduces an adaptive filter to eliminate harmonics and chattering, and adaptively compensates the estimated back-EMF value to reduce the estimation error caused by the phase delay. The improved SMO strategy was tested through Matlab/Simulink simulation and real experiments respectively. The results verified that the improved SMO strategy can significantly reduce chattering and phase delay and achieve good control performance at low speeds, as well as maintain good performance at full speed.

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Sensorless Speed Control of Permanent-Magnet Synchronous Motor Based on a New Sliding-Mode Observer

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.697.397 ◽

2014 ◽

Vol 697 ◽

pp. 397-401

Author(s):

Fei Fei Han ◽

Zhong Hua Wang ◽

Tong Yi Han

Keyword(s):

Permanent Magnet ◽

Sliding Mode ◽

Permanent Magnet Synchronous Motor ◽

Speed Control ◽

Synchronous Motor ◽

Lyapunov Theory ◽

Sliding Mode Observer ◽

Estimation Accuracy ◽

Speed Estimator ◽

The Stability

In this paper, a new sensorless speed control strategy which is based on a new sliding-mode observer (SMO) is proposed for permanent-magnet synchronous motor (PMSM). The rotor position is estimated by the back electromotive force (EMF). In order to improve the estimation accuracy, the speed estimator is proposed, which replace the method of direct differential. The Lyapunov theory is applied to prove the stability of the designed system. The simulation results indicate that the proposed sensorless speed control system of permanent-magnet synchronous motor based on a new sliding-mode observer is effective and feasible.

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Inter-turn Fault Identification of Surface-Mounted Permanent Magnet Synchronous Motor Based on Inverter Harmonics

Energies ◽

10.3390/en13040899 ◽

2020 ◽

Vol 13 (4) ◽

pp. 899

Author(s):

Fengyang Gao ◽

Guoheng Zhang ◽

Mingming Li ◽

Yunbo Gao ◽

Shengxian Zhuang

Keyword(s):

Permanent Magnet ◽

High Frequency ◽

Short Circuit ◽

Permanent Magnet Synchronous Motor ◽

Synchronous Motor ◽

Harmonic Excitation ◽

Working Environment ◽

Permanent Magnet Synchronous Motors ◽

Synchronous Motors ◽

Negative Sequence

Inter-turn short-circuit faults can lead to further faults in motors. This makes monitoring and identifying such faults particularly important. However, because of interference in their working environment, fault signals can be weak and difficult to detect in permanent magnet synchronous motors. This paper proposes a method for overcoming this by extracting the inverter harmonics as an excitation source and then extracting characteristic of fault measurements from the negative sequence voltage. First of all, a model of permanent magnet synchronous motor faults is established and a fault negative sequence voltage is introduced to calculate the fault indicators. Then the high frequency harmonic excitation in the voltage is extracted. This is injected into the original voltage signal and the high frequency negative sequence component is separated and detected by a second-order generalized integrator. Simulation results show that the proposed method can effectively identify inter-turn short-circuit faults in permanent magnet synchronous motors while remaining highly resistant to interference. The method is especially effective when the severity of the fault is relatively small and the torque is relatively large.

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