Six-Phase Supply Feasibility Using a PM Fractional-Slot Dual Winding Machine

Abstract

The growing interest in fault-tolerant drives requires new solutions avoiding the adoption of custom and expensive configurations. The machine with a dual three-phase winding is an interesting candidate. It is provided with two windings, each of them fed by one converter of half power. With a proper mechanical and electrical arrangement, the machine can be exactly a six-phase machine, obtaining higher performance during healthy conditions. In the event of a fault, one of the two three-phase windings (the faulty one) is disconnected, and the machine is operated by means of the healthy winding only. This paper analyzes the feasibility of this dual winding configuration applied to a nonoverlapped-coil fractional-slot winding permanent-magnet machine. The star of slots is applied to highlight the proper winding candidates. The more interesting windings are deeply analyzed

Analysis and Development of Fail-Operational Automotive Mechatronic Systems

“…In all other single point failure scenarios the full performance is still available for the driver. Moreover, a slightly increased output torque of 5% is sustained by the six phase machine compared to a three phase machine of the same size [8].…”

“…This machine type consists of two 3-phase subsystems which are separately controlled by two inverters. This leads to a higher output torque while no fault is present and to a nominal output torque of 40% in case of only one remaining inverter [8]. …”

Investigation of a Novel 24-Slot/14-Pole Six-Phase Fault-Tolerant Modular Permanent-Magnet In-Wheel Motor for Electric Vehicles

“…Both alternate-teeth-wound and all-teeth-wound fractional-slot concentrated windings are taken into consideration. Although the pole and slot combinations have been introduced in the discussion of six-phase supply feasibility, the selections for the feasible six-phase supply are limited to two three-phase winding shifting by 30 degree [29]. However, in Tables 1 and 2, two possible winding distributions-symmetric and asymmetric six-phase windings-are involved with the limitation of 2p = Q ± 2.…”

Reduction of Eddy Current Loss of Permanent-Magnet Machines With Fractional Slot Concentrated Windings

“…Considerable efforts have been devoted to investigating and reducing those harmonics, including: 1) using multi-layer tooth concentrated winding and shifting the winding systems by a specific number of slots [11][12][13]; 2) using different turns per coil or different turns per coil-side [14]; 3) modifying the stator yoke in specific locations by using magnetic flux-barriers in stator yoke [14]; 4) doubling the number of stator slots and using two winding systems [15,16], 5) using delta-star windings with different turns per coil [17,18]; 6) using the multiple three-phase concentrated windings [19][20][21]. Although these techniques have been adopted, the FSCW PM machines still suffer from either sub-or high MMF harmonics.…”