A review of sensorless control in induction machines using hf injection, test vectors and PWM harmonics

This paper gives a review of sensorless methods developed for AC drives' operation at very low and zero speed. The sensorless drives presented in this paper use reluctance spatial anisotropy to track the mechanical rotor position, allowing the use of vector control. To extract the position information additional test signals in form of active vector pulses or continuous high frequency signals are injected into the machine. This paper also presents a technique which does not make use of additional test signals, but only components resulting from the inverter PWM pattern. Practical results show that with all reviewed methods sensorless vector control at very low and zero speed is possible. However, disturbances (e.g. coming from the inverter or magnetic saturation) affect the position signal significantly and require appropriate compensation.

[1]  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.

[2]  G.M. Asher,et al.  The effect of rotor design on sensorless speed estimation using rotor slot harmonics identified by adaptive digital filtering using the maximum likelihood approach , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[3]  Robert D. Lorenz,et al.  Using multiple saliencies for the estimation of flux, position, and velocity in AC machines , 1997 .

[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]  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.

[6]  G.M. Asher,et al.  Sensorless position detection for vector controlled induction motor drives using an asymmetric outer-section cage , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[7]  Seung-Ki Sul,et al.  Inverter output voltage synthesis using novel dead time compensation , 1996 .

[8]  G.M. Asher,et al.  Analysis and suppression of inverter clamping saliency in sensorless position controlled induction machine drives , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[9]  M Sumner,et al.  Sensorless Control of Induction Machines at Low and Zero Speed by Using PWM Harmonics for Rotor-Bar Slotting Detection , 2010, IEEE Transactions on Industry Applications.

[10]  Robert D. Lorenz,et al.  Transducerless position and velocity estimation in induction and salient AC machines , 1994, Proceedings of 1994 IEEE Industry Applications Society Annual Meeting.

[11]  Jung-Ik Ha,et al.  Sensorless field orientation control of an induction machine by high frequency signal injection , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[12]  H. Zatocil.  Sensorless control of AC machines using high-frequency excitation , 2008, 2008 13th International Power Electronics and Motion Control Conference.

[13]  Mark Sumner,et al.  Operation of a sensorless PMSM drive without additional test signal injection , 2008 .

[14]  M. W. Degner,et al.  Dynamic operation of carrier signal injection based sensorless, direct field oriented AC drives , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[15]  Robert D. Lorenz,et al.  Position estimation in induction machines utilizing rotor bar slot harmonics and carrier-frequency signal injection , 2000 .

[16]  Mark Sumner,et al.  Influence of dead-time compensation on rotor position estimation in surface mounted PM machines using HF voltage injection , 2002, Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579).

[17]  Robert D. Lorenz,et al.  Transducerless field orientation concepts employing saturation-induced saliencies in induction machines , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[18]  C. Caruana,et al.  Sensorless flux position estimation at low and zero frequency by measuring zero-sequence current in delta connected cage induction machines , 2003, 38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003..

[19]  Mark Sumner,et al.  Sensorless position estimation for symmetric cage induction motor under loaded conditions , 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).

[20]  K. J. Bradley,et al.  A periodic burst injection method for deriving rotor position in saturated cage-salient induction motors without a shaft encoder , 1998 .

[21]  Mark Sumner,et al.  Sensorless control of induction Machines at zero and low frequency using zero sequence currents , 2006, IEEE Transactions on Industrial Electronics.

[22]  Mark Sumner,et al.  Encoderless position estimation for symmetric cage induction machines under loaded conditions , 2001 .

[23]  Mark Sumner,et al.  Analysis and Compensation of Inverter Nonlinearity Effect on a Sensorless PMSM Drive at Very Low and Zero Speed Operation , 2010, IEEE Transactions on Industrial Electronics.