Abstract
The paper studies a novel fault-tolerant strategy of the modular permanent magnet synchronous motor under open-circuit faults, which is called as the extended open-circuit fault-tolerant control (EOCFTC) strategy. The faulty modular motor based on the EOCFTC strategy can achieve the high fault-tolerance and maximum output torque capability by making the most of the remaining healthy phases. First, the mathematical model of the modular motor with n modules is described. Then based on the characteristics of the modular motor, a novel winding reconstruction strategy is proposed to deal with multiphase open-circuit faults in different modules. All remaining healthy phases are reasonably reconstructed according to the maximum output torque principle. Then these new modules can operate well by employing the armature magnetomotive force (MMF) compensation and the field-orientated control (FOC) strategy. Finally, all cases of open-circuit faults and the corresponding processing methods are discussed. The extreme case of open-circuit faults is described in detail, which shows the high fault-tolerance of the modular motor with the EOCFTC strategy. The experimental results verify the rationality and feasibility of the EOCFTC strategy on a two-module modular motor.
Highlights
Permanent magnet synchronous motor (PMSM) is one of the main energy conversion components, which has many excellent advantages such as high efficiency and high torque density [1]
This paper proposes a novel open-circuit fault-tolerant control strategy for a modular permanent magnet synchronous motor with n modules, which is called as the extended open-circuit fault-tolerant control (EOCFTC) strategy
Considering that each module has the same electrical position and the corresponding phase has the same electrical angle in the modular motor, we develop the EOCFTC strategy to make the most of the remaining healthy phases in the faulty modules by winding reconstruction, which can achieve the maximum output torque capability for the modular motor
Summary
Permanent magnet synchronous motor (PMSM) is one of the main energy conversion components, which has many excellent advantages such as high efficiency and high torque density [1]. It is worth to develop a fault-tolerant strategy for the modular motor which can utilize all possible healthy phases to achieve the maximum output torque capability under multiphase open-circuit fault. Due to the convenience and reliability of using well-developed algorithms of three-phases drives for each module, the fieldorientated control (FOC) and MMF compensation strategy are employed for the normal and single-phase open-circuit fault-tolerant operation respectively. In order to achieve the optimal fault-tolerance under multiphase open-circuit faults of the modular motor, a winding reconstruction strategy is studied based on the characteristics of the VOLUME 7, 2019. All multiphase open-circuit faults are discussed, and the extreme case in which there are only two healthy phases left is mentioned specially, which shows the high fault-tolerance of the modular motor with the EOCFTC strategy.
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