Direct Flux Vector Control of Axial Flux IPM Motors for in-wheel traction solutions

The paper describes a Direct-Flux Vector Control (DFVC) scheme suitable for synchronous Permanent Magnet (PM) drives employed in applications that require motor flux-weakening operation, as happens for traction drives. The proposed controller operates in stator flux reference frame and can be easily adapted for Surface-mounted PM (SPM) and Interior PM (IPM) motors. The stator flux is directly controlled by the direct component of the voltage vector, while the torque is controlled by regulating the quadrature current component. The DFVC scheme has been used for an Axial Flux IPM (AFIPM) designed as a wheel motor for light traction application. Experimental results are provided for an 1.2 kW AFIPM prototype, demonstrating good steady-state and transient performance, as well as maximum torque production under current and voltage limitations.

[1]  Andrea Cavagnino,et al.  Axial flux interior PM synchronous motor: parameters identification and steady-state performance measurements , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[2]  Seung-Ki Sul,et al.  New field weakening technique for high saliency interior permanent magnet motor , 2003, 38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003..

[3]  B. H. Smith,et al.  Twin rotor drive for an electric vehicle , 1993 .

[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]  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.

[6]  N. Bianchi,et al.  Magnetic models of saturated interior permanent magnet motors based on finite element analysis , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[7]  Seung-Ki Sul,et al.  Speed control of interior permanent magnet synchronous motor drive for the flux weakening operation , 1997 .

[8]  Ashwin M. Khambadkone,et al.  Torque control of IPMSM drives using direct flux control for wide speed operation , 2003, IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03..

[9]  E. Spooner,et al.  COMPACT PERMANENT-MAGNET MACHINES , 1997 .

[10]  Federico Scapino,et al.  Cross-saturation in synchronous reluctance motors of the transverse-laminated type , 1998 .

[11]  G. Pellegrino,et al.  Direct Flux Field-Oriented Control of IPM Drives With Variable DC Link in the Field-Weakening Region , 2009, IEEE Transactions on Industry Applications.

[12]  S. Morimoto,et al.  Expansion of operating limits for permanent magnet motor by current vector control considering inverter capacity , 1990 .

[13]  J. Holtz,et al.  Sensorless vector control of induction motors at very low speed using a nonlinear inverter model and parameter identification , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[14]  Andrea Cavagnino,et al.  Design and Realization of a Novel Axial Flux Interior PM Synchronous Motor for Wheel-Motors Applications , 2000 .