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This paper analyzes the influence of stator windings turn-to-turn fault on inverter-fed permanent magnet (PM) machines. By adding a secondary neutral point (NP) in stator windings, the turn fault detection and tolerant capability can all improve considering a small turn-to-turn short at early stage. From the perspective of fault detection, the proposed windings with two NPs increase the equipment impedance per NP. Once a turn fault occurs, the fault induced voltage harmonic magnitude increases. It results in a better signal-to-noise ratio for the fault detection. From the perspective of tolerant drive, the fault induced circulating currents can flow across different phase coils in the windings with two NPs. Reduced effect on circulating currents in a faculty machine is achieved due to the current diversion. Turn fault induced additional losses are then decreased comparing to conventional windings with only one NP. A 1-kW PM machine with two different windings is tested to verify the fault detection and tolerant performance.
Shih-Chin Yang; Yu-Liang Hsu; Po-Huan Chou; Cheng-Chung Hsu; Guan-Ren Chen; Kang Li. Fault Detection and Tolerant Capability of Parallel-Connected Permanent Magnet Machines Under Stator Turn Fault. IEEE Transactions on Industry Applications 2018, 54, 4447 -4456.
AMA StyleShih-Chin Yang, Yu-Liang Hsu, Po-Huan Chou, Cheng-Chung Hsu, Guan-Ren Chen, Kang Li. Fault Detection and Tolerant Capability of Parallel-Connected Permanent Magnet Machines Under Stator Turn Fault. IEEE Transactions on Industry Applications. 2018; 54 (5):4447-4456.
Chicago/Turabian StyleShih-Chin Yang; Yu-Liang Hsu; Po-Huan Chou; Cheng-Chung Hsu; Guan-Ren Chen; Kang Li. 2018. "Fault Detection and Tolerant Capability of Parallel-Connected Permanent Magnet Machines Under Stator Turn Fault." IEEE Transactions on Industry Applications 54, no. 5: 4447-4456.
Conventional shake tables employ linear controllers such as proportional‐integral‐derivative or loop shaping to regulate the movement. However, it is difficult to tune a linear controller to achieve accurate and robust tracking of different reference signals under payloads. The challenges are mainly due to the nonlinearity in hydraulic actuator dynamics and specimen behavior. Moreover, tracking a high‐frequency reference signal using a linear controller tends to cause actuator saturation and instability. In this paper, a hierarchical control strategy is proposed to develop a high‐performance shake table. A unidirectional shake table is constructed at the University of British Columbia to implement and evaluate the proposed control framework, which consists of a high‐level controller and one or multiple low‐level controller(s). The high‐level controller utilizes the sliding mode control (SMC) technique to provide robustness to compensate for model nonlinearity and uncertainties experienced in experimental tests. The performance of the proposed controller is compared with a state‐of‐the‐art loop‐shaping displacement‐based controller. The experimental results show that the proposed hierarchical shake table control system with SMC can provide superior displacement, velocity and acceleration tracking performance and improved robustness against modeling uncertainty and nonlinearities. Copyright © 2015 John Wiley & Sons, Ltd.
T. Y. Yang; Kang Li; Jian Yuan Lin; Yuanjie Li; D. P. Tung. Development of high-performance shake tables using the hierarchical control strategy and nonlinear control techniques. Earthquake Engineering & Structural Dynamics 2015, 44, 1717 -1728.
AMA StyleT. Y. Yang, Kang Li, Jian Yuan Lin, Yuanjie Li, D. P. Tung. Development of high-performance shake tables using the hierarchical control strategy and nonlinear control techniques. Earthquake Engineering & Structural Dynamics. 2015; 44 (11):1717-1728.
Chicago/Turabian StyleT. Y. Yang; Kang Li; Jian Yuan Lin; Yuanjie Li; D. P. Tung. 2015. "Development of high-performance shake tables using the hierarchical control strategy and nonlinear control techniques." Earthquake Engineering & Structural Dynamics 44, no. 11: 1717-1728.