Sensorless control for a PM machine with reduced current distortion using space vector PWM excitation

A sensorless control system for a surface mounted permanent magnet (PM) machine is developed which uses measurement of motor current derivative during the fundamental PWM vector excitation only. Vector extension is required when the vector width falls below a minimum time duration. The extension is made to allow the high frequency switching oscillations due to parasitic capacitances in the drive to die down. This paper introduces a new method to reduce these high frequency switching oscillations, in order to achieve position estimation with lower motor current distortion. Experimental results demonstrate the improved sensorless speed and position control using the proposed method.

[1]  M. Sumner,et al.  Sensorless Control of Induction Machines, including Zero Frequency using only Fundamental PWM Excitation , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[2]  A. Vandenput,et al.  Sensorless direct field orientation at zero flux frequency , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[3]  T.M. Wolbank,et al.  Sensorless control of induction machines by combining fundamental wave models with transient excitation technique , 2005, IEEE International Conference on Electric Machines and Drives, 2005..

[4]  J. Juliet,et al.  Sensorless acquisition of the rotor position angle for induction motors with arbitrary stator windings , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[5]  M. Schroedl,et al.  Sensorless control of AC machines at low speed and standstill based on the "INFORM" method , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[6]  C. Schauder,et al.  Adaptive speed identification for vector control of induction motors without rotational transducers , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

[7]  Qiang Gao,et al.  Sensorless Control of Surface Mounted Permanent Magnetic Machine Using the Standard Space Vector PWN , 2007, 2007 IEEE Industry Applications Annual Meeting.

[8]  H. Kubota,et al.  DSP-based speed adaptive flux observer of induction motor , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[9]  Th. M. Wolbank,et al.  A modified PWM scheme in order to obtain spatial information of AC machines without mechanical sensor , 2002, APEC. Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.02CH37335).

[10]  Jung-Ik Ha,et al.  Design and selection of AC machines for saliency-based sensorless control , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[11]  Tadashi Fukao,et al.  Robust speed identification for speed sensorless vector control of induction motors , 1993, Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting.