A synchronous homopolar machine for high-speed applications

The design, construction, and test of a high-speed synchronous homopolar motor/alternator, and its associated high efficiency six-step inverter drive for a flywheel energy storage system are presented in this paper. The work is presented as an integrated design of motor, drive, and controller. The performance goal is for power output of 30 kW at speeds from 50 kRPM to 100 kRPM. The machine features low rotor losses, high efficiency, construction from robust and low cost materials, and a rotor that also serves as the energy storage rotor for the flywheel system. The six-step inverter drive strategy maximizes inverter efficiency, and the sensorless controller works without position or flux estimation. A prototype of the flywheel system has been constructed, and experimental results for the system are presented.

[1]  Heath Fred Hofmann,et al.  High-speed synchronous reluctance machine for flywheel applications , 1998 .

[2]  R. G. Harley,et al.  High speed synchronous homopolar and permanent magnet machines comparative study , 1992, Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting.

[3]  Jin He,et al.  A high frequency high power IGBT inverter drive for 45 HP/16,000 RPM brushless homopolar inductor motor , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[4]  Francesco Profumo,et al.  Energetic Behavior of Soft Magnetic Materials in the Case of Inverter Supply , 1994 .

[5]  H. Hofmann,et al.  High-speed synchronous reluctance machine with minimized rotor losses , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[6]  M. Siegl,et al.  Losses and cooling of a high-speed and high-output power homopolar inductor alternator , 1991 .

[7]  Aldo Boglietti,et al.  Energetic behavior of induction motors fed by inverter supply , 1993, Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting.

[8]  Erwin Krämer,et al.  Dynamics of Rotors and Foundations , 1993 .

[9]  T. Fukao,et al.  Development of homo-polar type bearingless motors , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[10]  Giancarlo Genta,et al.  Kinetic energy storage , 1985 .