Abstract
A novel fault tolerant machine with integral slot non-overlapping concentrated winding (ISNCW) is proposed in this paper. With the distribution of phase windings in axial, the proposed machine realized excellent isolation capability between different phases. The performance comparisons between the proposed machine and the traditional integer slot overlapping winding (ISOW) machine are made by the analytical method and finite element analysis (FEA). Compared to the ISOW machine, the proposed machine has better performance in low speed high torque applications, and much better fault tolerant capability and flux weakening capability. Especially, the proposed machine appears excellent performance in limiting the short circuit current and preventing the irreversible demagnetization of permanent magnet under short-circuit fault. The phase independent structure makes the maintenance and replacement of the fault module convenient and saves the maintenance cost further.
Highlights
Electrical machine as the key part of the modern electric drive systems is facing more and more demands
The reliability and fault tolerant capability are especially important for permanent magnet synchronous machine (PMSM) applied in safety-critical applications, such as the electrical vehicle, more-electric aircraft, electrical ship propulsion, railway traction, wind power generation, etc. [1], [2]
With the advent of fractional slot concentrated winding (FSCW), the modular design concept has been applied to the design of FSCW PMSM, in which the stator core is divided into multiple independent modules
Summary
Electrical machine as the key part of the modern electric drive systems is facing more and more demands. The single layer fractional slot concentrated winding (FSCW) is most widely used in fault tolerant PMSMs due to good electrical, magnetic, thermal, and physical isolations between different phases [3], [4]. Many harmonic suppression methods are proposed [11]–[19], these methods lead to some drawbacks such as, the manufacture advantages of FSCW machines disappeared, and the interphase coupling increased due to the disappeared isolation between different phases. These drawbacks largely decreased the fault tolerant capability. ISOW machine with the same pole slot combination based on some established analytical techniques
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