Fault-tolerant model predictive control of six-phase permanent magnet synchronous hub motors

2021 ◽  
pp. 1-24
Author(s):  
Xiaodong Sun ◽  
Feng Cai ◽  
Xiang Tian ◽  
Minkai Wu
Keyword(s):  
Permanent Magnet ◽  
Fault Tolerant ◽  
High Reliability ◽  
Permanent Magnet Synchronous Motor ◽  
Torque Ripple ◽  
Control Mode ◽  
Multiple Control ◽  
Cascade Structure ◽  
Low Torque ◽  
Multi Phase

Permanent magnet synchronous hub motors (PMSHMs) have been gradually introduced into the applications of electric vehicles. On this basis, the six-phase motor has the characteristics of high reliability, high power density and low torque ripple. And its fault tolerance is a large advantage compared with the three-phase motor. The multi-phase permanent magnet synchronous motor is redundant due to the number of phases. When the motor fails, it does not have to stop running, merely adjust its control mode and enter the fault-tolerant compensation control algorithm to resume the operation of the system. The FCS-MPC algorithm can replace the cascade structure in the traditional control and eliminate the modulation module. This makes it have good steady-state performance. The speed response is also improved. It can be combined with multiple control objectives with strong flexibility by simply changing the objective function. The prediction model is compensated. Finally, the experimental results show the effectiveness of this method.

scholarly journals Fault-Tolerant Control Strategy for 12-Phase Permanent Magnet Synchronous Motor

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3462 ◽  
Author(s):  
Hanying Gao ◽  
Wen Zhang ◽  
Yu Wang ◽  
Zhuo Chen
Keyword(s):  
Permanent Magnet ◽  
Control Strategy ◽  
Fault Tolerant ◽  
High Reliability ◽  
Permanent Magnet Synchronous Motor ◽  
Fault Tolerant Control ◽  
Torque Ripple ◽  
Synchronous Motor ◽  
Open Circuit ◽  
Magnetomotive Force

Multi-phase motors have attracted increasing attention in fields seeking high reliability, such as electric vehicles, ships, and rail transit, as they exhibit advantages, such as high reliability and fault tolerance. In this study, we consider a 12-phase permanent magnet synchronous motor (PMSM). First, a mathematical model of the 12-phase PMSM in the static coordinate system is established and the model is simplified according to the constraint condition of neutral point isolation. Second, according to the principle of invariant magnetomotive force under normal and fault conditions, two optimal control strategies of winding current, i.e. maximum torque output (MTO) and minimum copper consumption (MCC), are proposed. For a single-phase open-circuit fault, two optimization methods are used to reconstruct the residual phase current, such that the motor can maintain normal torque output and exhibit lower torque ripple under the fault state. Finally, system simulation and experimental research are conducted; the results verify the accuracy and feasibility of the fault-tolerant control strategy of the 12-phase PMSM proposed in this paper.

scholarly journals Direct Torque Control of Dual Three-Phase Permanent Magnet Synchronous Motor

2021 ◽  
Vol 297 ◽  
pp. 01017
Author(s):  
Fouad Labchir ◽  
Mhammed Hasoun ◽  
Aziz El Afia ◽  
Karim Benkirane ◽  
Mohamed Khafallah
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Synchronous Motor ◽  
Torque Control ◽  
Stator Windings ◽  
Torque Control Strategy ◽  
Three Phase ◽  
Low Torque

In this paper a direct torque control strategy for dual three-phase permanent magnet synchronous motor (DTP-PMSM) is presented, the machine has two sets of three-phase stator windings spatially phase shifted by 30 electric degrees. In order to reduce the stator harmonic current, torque and flux are controlled based on regulators and Vector Space Decomposition technique. The proposed approach has the benefits of low stator current distortion and low torque ripple. The validity and the efficiency of the selected technique are confirmed by simulation results.

scholarly journals Multiphase SVPWM Strategy Analysis and Implementation of Seven-Phase Permanent Magnet Synchronous Motor

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Mingli Lu ◽  
Dong Zhang ◽  
Benlian Xu ◽  
Haodong Yang ◽  
Yi Xin
Keyword(s):  
Permanent Magnet ◽  
Electric Propulsion ◽  
High Reliability ◽  
Permanent Magnet Synchronous Motor ◽  
Harmonic Component ◽  
Torque Ripple ◽  
Synchronous Motor ◽  
Phase System ◽  
Strategy Analysis ◽  
Multiphase Motor

The multiphase motor drive systems have become a focus in many application areas such as ship electric propulsion, urban mass transit, aerospace, and weapon equipment, as they are characterized by high power density, low torque pulsation as small torque ripple, large output power, strong fault tolerance, and high reliability. However, with the increase of the phase number of the motor, the current harmonic component increases correspondingly, which leads to the decrease of the control performance compared with the three-phase system. In order to overcome this challenge, implementation method of driving control technology for seven-phase permanent magnet synchronous motor (PMSM) based on SVPWM algorithm is discussed thoroughly in this paper. Simulink and experiments have been developed to check its practical feasibility. The results show that the near-six vector SVPWM algorithm (NSV-SVPWM) achieves better performance than other methods.

scholarly journals Fault-Tolerant Control of Coil Inter-Turn Short-Circuit in Five-Phase Permanent Magnet Synchronous Motor

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5669
Author(s):  
Dingyu Wang ◽  
Yiguang Chen
Keyword(s):  
Permanent Magnet ◽  
Fault Tolerant ◽  
Short Circuit ◽  
Permanent Magnet Synchronous Motor ◽  
Harmonic Component ◽  
Short Circuit Current ◽  
Torque Ripple ◽  
Synchronous Motor ◽  
Even Order ◽  
Gain Compensation

In the five-phase permanent magnet synchronous motor (PMSM) control system, the torque ripple caused by coil inter-turn short-circuit (ITSC)fault will make the motor performance worse. Due to the existence of the short-circuit current in the faulty phase and the third harmonic component in the permanent magnet flux linkage, the electromagnetic torque will contain even-order ripple components when the faulty phase is removed. Torque ripple also cause speed ripple. In this paper, the repetitive controller (RC) is used to perform proportional gain compensation for speed ripple. By designing the RC and connecting RC and proportional integral (PI) controller in parallel for the speed loop, the torque ripple amplitude can be reduced. It can be seen from the simulation and experimental results that the torque ripple suppression strategy based on RC can effectively suppress the torque ripple under ITSC fault.

scholarly journals A novel MTPA and flux weakening method of stator flux oriented control of PMSM

2021 ◽  
Author(s):  
Yuliang Wen ◽  
Hanfeng Zheng ◽  
Fang Yang ◽  
Xiaofan Zeng
Keyword(s):  
Control Strategy ◽  
High Efficiency ◽  
Control Method ◽  
High Reliability ◽  
Permanent Magnet Synchronous Motor ◽  
Torque Ripple ◽  
Speed Range ◽  
Low Torque ◽  
Maximum Torque Per Ampere ◽  
Flux Weakening

Abstract Permanent magnet synchronous motor (PMSM) has the advantages of high efficiency, high power density and high reliability. It has been widely used in electric vehicles, rail transit, industrial transmission and other fields. Compared with the traditional PMSM control strategy, the Indirect stator-quantities control (ISC) of low torque ripple induction motor has high dynamic response performance in the whole speed range, with high stability and strong security. However, due to the inherent characteristics of PMSM, there are still some difficulties in applying ISC strategy, such as solving the load angle corresponding to the current torque, realizing the maximum torque per ampere (MTPA) control and flux weakening control method in the stator field oriented control algorithm of PMSM. In this paper, theoretical analysis and discussion are carried out for the above difficulties, and an indirect stator vector control (ISC) method for PMSM is proposed. Finally, combined with the electric drive application platform of electric vehicle, the simulation and experimental results verify that the proposed ISC control strategy of PMSM also has good dynamic and steady-state performance in the whole speed range.

scholarly journals Torque Ripple Optimization of a Novel Cylindrical Arc Permanent Magnet Synchronous Motor Used in a Large Telescope

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 362
Author(s):  
Shuhua Fang ◽  
Songhan Xue ◽  
Zhenbao Pan ◽  
Hui Yang ◽  
Heyun Lin
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Torque Ripple ◽  
Synchronous Motor ◽  
Direct Drive ◽  
Large Telescope ◽  
Tracking Accuracy ◽  
Cogging Torque ◽  
Low Torque ◽  
Large Telescopes

This paper proposes the use of a novel cylindrical arc permanent magnet synchronous motor (CAPMSM) in a large telescope, which requires high positioning accuracy and low torque ripple. A 2D finite element method was used to analyze the cogging torque of the CAPMSM. The CAPMSM can be an alternative for a rotating motor to realize direct drive. A new method is proposed to separate the cogging torque, Tcog, into the torque, Tslot, generated by the slotted effect and the end torque, Tend, generated by the end effect. The average torque and the torque ripple are optimized considering stator center angle, the angle between two adjacent stators and the unequal thickness of a Halbach permanent magnet. The torque ripple decreased from 31.73% to 1.17%, which can satisfy the requirement of tracking accuracy for large telescopes.

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