Design optimization and analysis of a synchronous reluctance machine for fault-tolerant applications

This paper deals with the design and optimization of a synchronous reluctance machine with dual three-phase winding for fault-tolerant applications. The target is to investigate several design solutions, in terms of winding arrangements and machine geometry, to achieve a good drive system reliability both in healthy and faulty conditions. The fault reliability is evaluated in terms of torque quality, unbalanced force and magnetic coupling between the healthy and the faulty three-phase winding. In the first part of the work, two different optimization strategies of the rotor geometry are proposed and an optimal solution is selected. In the second part, the performance of the selected individual are evaluated in several healthy and faulty operating conditions to investigate the reliability of the proposed design procedure

High-Speed Synchronous Reluctance Motors: Computation of the Power Limits by Means of Reluctance Networks

The aim of this paper is to describe the torque and power behavior of synchronous reluctance motors for high-speed applications. The design of such motors is the result of a trade-off between magnetic and mechanical aspects. In fact, the radial ribs have to be properly design limiting the quadrature flux axis and the mechanical stresses due to centrifugal forces. The rotor geometry resulting from such compromise determines an unusual flux density distribution that cannot be accurately described with simple analytical models based on restrictive hypothesis. For this reason, a nonlinear reluctance network is proposed to consider the saturation of both rotor and stator. The results of this approach are confirmed by finite element analysis

Stator fault diagnosis by reactive power in dual three-phase reluctance motors

Electrical machines are wide spread because of their intrinsic robustness, versatility and reduced impact on energy and resources. Recently, the demand has focused on specific features: compatibility with power converters and fault tolerance. In fact, a wide range of applications require variable speed drives and high rejection of faults, i.e. safe operation also for non-critical applications. Here, a dual three-phase stator configuration is used, and a novel method for stator fault detection is presented. This method is based on reactive power measurements from both three-phase systems. A differential diagnostic index is defined, that can be used to detect effectively stator faults, isolating them from torque oscillations, load unbalances or other pitfalls

Design Optimization and Analysis of a Synchronous Reluctance Machine for Fault-Tolerant Applications

This paper deals with the design and optimization of a synchronous reluctance machine with dual three-phase winding for fault-tolerant applications. The target is to investigate several design solutions, in terms of winding arrangements and machine geometry, to achieve a good drive system reliability both in healthy and faulty conditions. The fault reliability is evaluated in terms of torque quality, unbalanced force and magnetic coupling between the healthy and the faulty three-phase winding. In the first part of the work, two different optimization strategies of the rotor geometry are proposed and an optimal solution is selected. In the second part, the performance of the selected individual are evaluated in several healthy and faulty operating conditions to investigate the reliability of the proposed design procedure

Optimal Design and Experimental Validation of a Synchronous Reluctance Machine for Fault-Tolerant Applications

In this paper a dual-three phase synchronous reluctance machine is optimized for fault-tolerant applications. The main objective of such a design is improving the fault-tolerant capability by means of a proper motor geometry and winding arrangement paying attention to the torque density, torque ripple, mutual magnetic coupling and the maximum short circuit currents in several operating conditions. Finally, a prototype is manufactured and tested in order to validate the simulation predictions yielding good results

Design optimization and analysis of a synchronous reluctance machine for fault-tolerant applications

This paper deals with the design and optimization of a synchronous reluctance machine with dual three-phase winding for fault-tolerant applications. The target is to investigate several design solutions, in terms of winding arrangements and machine geometry, to achieve a good drive system reliability both in healthy and faulty conditions. The fault reliability is evaluated in terms of torque quality, unbalanced force and magnetic coupling between the healthy and the faulty three-phase winding. In the first part of the work, two different optimization strategies of the rotor geometry are proposed and an optimal solution is selected. In the second part, the performance of the selected individual are evaluated in several healthy and faulty operating conditions to investigate the reliability of the proposed design procedure

Stator fault diagnosis by reactive power in dual three-phase reluctance motors

Electrical machines are wide spread because of their intrinsic robustness, versatility and reduced impact on energy and resources. Recently, the demand has focused on specific features: compatibility with power converters and fault tolerance. In fact, a wide range of applications require variable speed drives and high rejection of faults, i.e. safe operation also for non-critical applications. Here, a dual three-phase stator configuration is used, and a novel method for stator fault detection is presented. This method is based on reactive power measurements from both three-phase systems. A differential diagnostic index is defined, that can be used to detect effectively stator faults, isolating them from torque oscillations, load unbalances or other pitfalls