Rotor position and speed estimation of a variable structure direct torque controlled IPM synchronous motor drive at very low speeds

The performance of a speed sensorless variable structure direct torque controlled interior permanent magnet synchronous motor drive at very low speeds including standstill is investigated in this paper. The rotor position and speed are estimated using a high frequency signal injection algorithm at low speeds and a sliding observer at medium to high speeds. The changeover between these two algorithms is performed using a weighting function which smoothly hands over estimated flux and speed information for torque estimation and speed feedback purposes respectively. Experiments were performed to test the effectiveness of the proposed high frequency signal injection algorithm and results show that the sensorless drive is capable of accurately estimating position and speed at very low speeds including standstill.

[1]  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.

[2]  Lixin Tang,et al.  A novel direct torque controlled interior permanent magnet synchronous machine drive with low ripple in flux and torque and fixed switching frequency , 2004, IEEE Transactions on Power Electronics.

[3]  S. Sayeef,et al.  Rotor Position and Speed Estimation of a Variable Structure Direct Torque Controlled Ipm Synchronous Motor Drive at Very Low Speeds , 2008, AUPEC 2008.

[4]  L. Harnefors.  Speed estimation from noisy resolver signals , 1996 .

[5]  Mark Sumner,et al.  Hybrid rotor position observer for wide speed-range sensorless PM motor drives including zero speed , 2006, IEEE Transactions on Industrial Electronics.

[6]  S. Sayeef,et al.  Sensorless direct torque and flux control of an IPM synchronous motor drive at low speed and standstill , 2008, 2008 Australasian Universities Power Engineering Conference.

[7]  K. W. Lim,et al.  Analysis of direct torque control in permanent magnet synchronous motor drives , 1997 .

[8]  Mario Pacas,et al.  Encoderless Predictive Direct Torque Control for Synchronous Reluctance Machines at Very Low and Zero Speed , 2008, IEEE Transactions on Industrial Electronics.

[9]  Maurice Apap,et al.  Sensorless vector control of a surface mount PMSM using high frequency injection , 2002 .

[10]  M.F. Rahman,et al.  Direct Torque and Flux Regulation of an IPM Synchronous Motor Drive Using Variable Structure Control Approach , 2004, IEEE Transactions on Power Electronics.

[11]  M. F. Rahman,et al.  A direct torque controlled interior permanent magnet synchronous motor drive incorporating field weakening , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[12]  F. Meibody-Tabar,et al.  Back-EMF estimation based sensorless control of PMSM: robustness with respect to measurement errors and inverter irregularities , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[13]  S. Sayeef,et al.  Improved low speed performance of a PI-DTC interior PM machine with compensations of dead-time effects and forward voltage drops , 2007, 2007 7th Internatonal Conference on Power Electronics.

[14]  Qiang Gao,et al.  Sensorless Position and Speed Control of Induction Motors Using High-Frequency Injection and Without Offline Precommissioning , 2007, IEEE Transactions on Industrial Electronics.

[15]  M. Depenbrock,et al.  Direct self-control (DSC) of inverter-fed induction machine , 1988 .

[16]  M.F. Rahman,et al.  Low-Speed and Standstill Operation of a Sensorless Direct Torque and Flux Controlled IPM Synchronous Motor Drive , 2010, IEEE Transactions on Energy Conversion.

[17]  Murat Barut,et al.  Experimental Evaluation of Braided EKF for Sensorless Control of Induction Motors , 2008, IEEE Transactions on Industrial Electronics.

[18]  Muhammed Fazlur Rahman,et al.  An Adaptive Sliding Stator Flux Observer for a Direct-Torque-Controlled IPM Synchronous Motor Drive , 2007, IEEE Transactions on Industrial Electronics.

[19]  R. D. Lorenz,et al.  Rotor position and velocity estimation for a salient-pole permanent magnet synchronous machine at standstill and high speeds , 1998 .

[20]  Iqbal Husain,et al.  Four-quadrant pulse injection and sliding mode observer based sensorless operation of a switched reluctance machine over entire speed range including zero speed , 2005 .

[21]  Toshihiko Noguchi,et al.  A New Quick-Response and High-Efficiency Control Strategy of an Induction Motor , 1986, IEEE Transactions on Industry Applications.

[22]  Manfred Morari,et al.  Model Predictive Direct Torque Control—Part I: Concept, Algorithm, and Analysis , 2009, IEEE Transactions on Industrial Electronics.

[23]  F. Blaabjerg,et al.  Combined Flux Observer With Signal Injection Enhancement for Wide Speed Range Sensorless Direct Torque Control of IPMSM Drives , 2008, IEEE Transactions on Energy Conversion.

[24]  C. French,et al.  Direct torque control of permanent magnet drives , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[25]  G.M. Asher,et al.  Flux position estimation in cage induction machines using synchronous HF injection and Kalman filtering , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[26]  Thierry Meynard,et al.  Switching frequency imposition and ripple reduction in DTC drives by using a multilevel converter , 2002 .