Compact permanent-magnet generator for hybrid vehicle applications

In hybrid electric vehicle (HEV) drivetrains an electrical generator is coupled onto the shaft of an internal-combustion engine (ICE) in order to process either the entire or a given fraction of the traction power required by the vehicle wheels. As such an ICE-driven generator is being confined within the vehicle hood and is exposed to heating resulting from ICE operation, high compactness, totally enclosed construction, and suitable machine cooling arrangement become challenging targets the generator design must deal with. Due to unique characteristics such as higher torque per volume and higher efficiency compared to other machine topologies, the axial-field permanent-magnet machine topology was selected for a 15-kW-at-4500-r/min-rated generator prototype that would be utilized in a demonstrator of an HEV drive train. This paper describes the original solutions adopted for the design of such an HEV generator and reports experimental results taken from the prototype machine.

[1]  F. Caricchi,et al.  Design Criteria of a Low-Speed Axial-Flux PM Synchronous Machine , 1991 .

[2]  F. Crescimbini,et al.  Permanent-magnet, direct-drive, starter/alternator machine with weakened flux linkage for constant-power operation over extremely wide speed range , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[3]  T.A. Lipo,et al.  TORUS concept machines: pre-prototyping design assessment for two major topologies , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[4]  F. Crescimbini,et al.  Design and construction of a wheel-directly-coupled axial-flux PM motor prototype for EVs , 1994, Proceedings of 1994 IEEE Industry Applications Society Annual Meeting.

[5]  R. Spee,et al.  The design and development of an axial flux permanent magnet brushless DC motor for wheel drive in a solar powered vehicle , 1994, Proceedings of 1994 IEEE Industry Applications Society Annual Meeting.

[6]  F. Profumo,et al.  A comparison between the axial flux and the radial flux structures for PM synchronous motors , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[7]  A. Di Napoli,et al.  Multiple-input DC-DC power converter for power-flow management in hybrid vehicles , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[8]  E. Spooner,et al.  TORUS' : a slotless, toroidal-stator, permanent-magnet generator , 1992 .

[9]  F. Crescimbini,et al.  Modular, axial-flux, permanent-magnet motor for ship propulsion drives , 1997, 1997 IEEE International Electric Machines and Drives Conference Record.

[10]  A.J.A. Vandenput,et al.  Design, development and testing of a high-speed axial-flux permanent-magnet machine , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[11]  F. Crescimbini,et al.  Compact wheel direct drive for EVs , 1996 .

[12]  Thomas A. Lipo,et al.  A comparison of power density for axial flux machines based on general purpose sizing equations , 1999 .

[13]  A. C. Renfrew,et al.  Motoring performance of the toroidal permanent-magnet machine 'Torus' , 1991 .

[14]  F. Crescimbini,et al.  Axial-flux permanent magnet motor for direct-drive elevator systems without machine room , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[15]  Ezio Santini,et al.  Axial-Flux AC Motor Drives: A New Solution for Innovative Electrical Vehicles , 1994 .

[16]  F. Crescimbini,et al.  Low-cost compact permanent magnet machine for adjustable-speed pump application , 1998 .

[17]  B. J. Chalmers,et al.  An axial-flux permanent-magnet generator for a gearless wind energy system , 1999 .

[18]  Luca Solero,et al.  Lightweight, compact, three-wheel electric vehicle for urban mobility , 1998, 1998 International Conference on Power Electronic Drives and Energy Systems for Industrial Growth, 1998. Proceedings..

[19]  A. Tenconi,et al.  Axial flux machines drives: a new viable solution for electric cars , 1996, Proceedings of the 1996 IEEE IECON. 22nd International Conference on Industrial Electronics, Control, and Instrumentation.