Optimal torque per amp for brushless doubly fed reluctance machines

This paper documents the finite element (FE) analysis of a range of rotors for a brushless doubly fed reluctance machine (BDFRM). The aim to this work is to increase the understanding of the BDFRM and determine an optimal rotor design for torque generation and machine power factor. The results of the analysis show a significant contrast between the rotors for a synchronous reluctance machine and BDFRM. The optimal stacking factor for the BDFRM is 0.86, whereas the synchronous reluctance optimum is 0.5. Even though the two rotors can be physically identical, the resemblance is superficial.

[1]  Annabelle McIver,et al.  Optimal control of a variable speed wind turbine under dynamic wind conditions , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[2]  Timothy J. E. Miller,et al.  Maximising the saliency ratio of the synchronous reluctance motor , 1993 .

[3]  T.J.E. Miller,et al.  Torque prediction using the flux-MMF diagram in AC, DC, and reluctance motors , 1996 .

[4]  S. J. Salon,et al.  Finite element analysis of electrical machines , 1995 .

[5]  E. M. Schulz,et al.  Optimal rotor design for brushless doubly fed reluctance machines , 2003, 38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003..

[6]  Shigeru Okuma,et al.  A new flux-barrier-type reluctance motor with a slit rotor , 1999, IEEE Trans. Ind. Electron..

[7]  G. Franceschini,et al.  Design of low-torque-ripple synchronous reluctance motors , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[8]  Alfredo Vagati,et al.  Design criteria of high performance synchronous reluctance motors , 1992, Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting.

[9]  J.H.R. Enslin,et al.  Performance optimization for doubly-fed wind power generation systems , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[10]  R.E. Betz,et al.  The use of doubly fed reluctance machines for large pumps and wind turbines , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[11]  Alan K. Wallace,et al.  The brushless doubly-fed machine: its advantages, applications and design methods , 1993 .

[12]  E. M. Schulz,et al.  Impact of winding and gap flux density harmonics on brushless doubly fed reluctance machines , 2004 .