Synchronous Reluctance Motor with Dual Three-Phase Winding for Fault- Tolerant Applications

This paper deals with dual three-phase winding synchronous reluctance motor designed for increasing the drive fault-tolerance. The two three-phase windings are supplied by separate inverters. In the event of fault of either a winding phase or an inverter, the faulty three-phase winding is disconnected and the motor is operated feeding the healthy winding only. Various winding configurations are considered and compared, in terms of average torque, radial force and mutual coupling between the two windings, during the faulty operations. Considerations are given regarding the winding arrangements so as to avoid excessive torque ripple and unbalanced radial force in this operating conditions

Fault Analysis for Dual Three-Phase Synchronous Reluctance Motor

This study investigates the dual three-phase synchronous reluctance motor and analyzes its post-fault characteristics under open-circuit and short-circuit faults of motor windings and inverter switches. The half-supply mode is also investigated as a strategy to operate with high efficiency and tolerant mode. Moreover, the different winding arrangement is considered

Design and Optimization of a PMASR Motor for Low-Voltage E-Scooter Applications

The aim of this paper is to propose an accurate and effective procedure to design a low-voltage permanent magnet assisted synchronous reluctance machine by means of a FEA-based multi-objective optimization. The proposed procedure allows to obtain design solutions that satisfy given overload and flux-weakening capabilities within the voltage and current limits imposed by the battery and inverter Volt-Ampere rating. The paper starts with the presentation of the design requirements and the discussion of the optimization parameters and objectives. Then, the proposed design procedure is presented in detail step by step. Finally, a prototype is manufactured and tested to Investigate the reliability of FEA results

Design methodology for high-speed synchronous reluctance machines

This study presents two design methodologies for high-speed synchronous reluctance (REL) machines. The interest for high-speed drives comes from the request for compactness and high efficiency. The synchronous REL motors have been widely studied for several applications, but a coherent design procedure for high speed has not been proposed in the literature. The study proposes some analytical procedures to get an initial design. Then the rotor geometry optimisation through a differential evolution algorithm is described. Finally, a design example is given and thoroughly analysed using these two approaches

Bonded Magnets in PM-Assisted Synchronous Reluctance Machines: Performance Dependence on the Production Technology

The versatility and robustness with the low costs, characterize the synchronous reluctance SRM machines. On the other hand, some drawbacks limit the potential of such machines. A solution was found in the use of permanent magnets in the flux barriers. The adoption of traditional regular sintered magnets does not allow a complete filling of the flux barriers, therefore the adoption of bonded magnets has been proposed, and two different production technologies have been analyzed. Three prototype machines have been prepared: Reference SRM and two PM-assisted reluctance. Interesting results have been obtained from experimental tests and compared to FE simulation ones

The study of permanent magnet assisted reluctance machine with the adoption of NdFeB bonded magnets

The aim of the present paper is the evaluation of the performance of PM-assisted synchronous reluctance (PMAREL) motors with bonded magnets. Such magnets allow to fill completely the rotor flux barriers obtaining better performance, in terms of torque density and flux weakening capability, with respect to synchronous reluctance (REL) motors and PMAREL with the common magnet typologies. Several neodymium iron boron bonded magnet typologies have been made in laboratory and proposed as alternatives to the most common ferrite bonded magnets. The rotor geometry has been optimized with the multiple aims of achieving the maximum average torque with the lowest torque ripple and to simplify the PM insertion. The motors performance have been evaluated by means of finite elements analysis considering the rotor with and without the PM effect