Abstract
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.
Highlights
With the development and universal application of microcomputers, fault-tolerant technology has developed rapidly in multiprocessor systems, flying hoc networks, cloud computing, wireless sensor networks and so on [1,2,3,4]
Deduced the expression of winding phase current for the fault-tolerant control with minimum copper consumption (MCC) based on the principle of invariant magnetomotive force (MMF) before and after faults; this method requires that the motors have odd winding phase numbers, and its application is limited
For the phase open circuit, according to the principle of the invariant MMF, the residual current is reconstructed by the two current optimization methods of maximum torque output (MTO) and MCC, respectively, so that the motor maintains the normal torque output under the fault condition, and a lower torque ripple is obtained
Summary
With the development and universal application of microcomputers, fault-tolerant technology has developed rapidly in multiprocessor systems, flying hoc networks, cloud computing, wireless sensor networks and so on [1,2,3,4]. Deduced the expression of winding phase current for the fault-tolerant control with minimum copper consumption (MCC) based on the principle of invariant magnetomotive force (MMF) before and after faults; this method requires that the motors have odd winding phase numbers, and its application is limited. For the phase open circuit, according to the principle of the invariant MMF, the residual current is reconstructed by the two current optimization methods of maximum torque output (MTO) and MCC, respectively, so that the motor maintains the normal torque output under the fault condition, and a lower torque ripple is obtained. In view of the shortcomings of the above methods, this study considers a neutral-isolated 12phase PMSM as the research object and constructs a fault-tolerant strategy based on normal decoupling transformation.
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