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Lateral-Stator Machine (LSM) topology is presented in earlier works as an unconventional machine that is advantageous for high-speed, direct-drive applications in confined spaces. Owing to its peculiar geometry, LSM makes use of the additional space in a tool head that cannot be utilized by standard Cylindrical-Stator Machines (CSMs). However, a fair and quantitative comparison of LSM and CSM topologies...
Condition monitoring of the Brushless Wound Field Synchronous Generator (BWFSG) is important as it is widely used in mission and safety critical applications such as marine vessels. The frequency signatures in rotor field current are well known indicators to detect and diagnose stator winding short circuits in synchronous generators, in addition the damper bars current could also be used for fault...
This paper presents a detailed study on topology dependent magnet defect fault signatures in permanent magnet (PM) motors. A new mathematical approach is introduced to analyze the fault signature behaviors in PM motors with different design specs such as combinations including winding types, number and location of stator coils / magnet defects etc. Thanks to the flexible features of the proposed method,...
It is very important to estimate flux accurately in implementing high-performance control of AC motors. Theoretical analysis has been made to illustrate the performance of the pure-integration-based and the Low-Pass Filter (LPF) based flux estimators. A novel flux estimator based on Second-Order General Integrator (SOGI) with Frequency Locked-Loop (FLL) is investigated in this paper for induction...
This paper presents a sensor-less method to control triple-star nine-phase Interior Permanent Magnet (IPM) machines based on a decoupled machine model. The decoupled model removes the control complexity of the drive caused by the coupling inductance terms between different sets of three-phase windings of the triple-star machine. The rotor position is estimated using high frequency voltage injections...
This paper presents magnet defect faults detection through fluxgate sensors simply by monitoring the leakage flux content around permanent magnet synchronous motors (PMSMs). As known, flux spectrums of electric machines contain most critical and direct fault related information to monitor and characterize various faults and their progressions. In this paper, a remote/on case fault monitoring prototype...
Switched doubly-fed machines (DFM) creates variable speed drives with reduced power electronics requirements compared to shaft power, and with the additional benefit of controllable stator power factor. A solid-state transfer switch is a critical component of a switched-DFM drive that not only allows seamless shaft control across the full speed range but also permits effective grid interaction. This...
Multiphase PMSMs are widely used in fault-tolerant control applications. And one of the important fault-tolerant control problems is fault diagnosis. In most existing references, the fault diagnosis always focuses on three-phase PMSM. In this paper, a novel model and a fault diagnosis method of inter-turn short circuit (ITSC) fault for five-phase PMSM based on particle swarm optimization (PSO) are...
A vector control strategy of grid-connected brushless doubly fed induction generator (BDFIG) is proposed in this paper. Compared to other control strategies, proposed control can realize completely decoupled control, doesn't need to evaluate rotor flux, rotor current or control windings flux and has smaller dependency on BDFIG model and parameters, has a very similar controller structure as mature...
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