Sensorless acquisition of the rotor position angle for induction motors with arbitrary stator windings

The anisotropy of a cage rotor is utilized to determine the angular position of the rotor in an induction machine. The switching transients generated by a pulsewidth-controlled inverter serve as test signals. The response of the three-inverter terminal currents is exploited to derive a quasi-instantaneous rotor position signal. The position is sensed at the inverter through the 3-phase motor cable by measuring the current derivatives. The method does not require additional wire connections. It is applicable to induction motors having the stator windings connected either in wye or in delta. The results are supported by measurements from an experimental setup.

[1]  J. Esch.  Prolog to sensorless control of induction motors , 2002 .

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

[3]  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..

[4]  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).

[5]  J. Holtz,et al.  Acquisition of rotor anisotropy signals in sensorless position control systems , 2004, IEEE Transactions on Industry Applications.

[6]  Joachim Holtz,et al.  Sensorless control of induction motor drives , 2002, Proc. IEEE.

[7]  A. Keyhani,et al.  Sensorless control of induction motors , 2001, IEMDC 2001. IEEE International Electric Machines and Drives Conference (Cat. No.01EX485).

[8]  Joachim Holtz,et al.  Acquisition of rotor anisotropy signals in sensorless position control systems , 2003 .

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

[10]  C. Caruana,et al.  Sensorless flux position estimation at low and zero frequency by measuring zero-sequence current in delta-connected cage induction machines , 2005, IEEE Transactions on Industry Applications.