Title :
Sensorless acquisition of the rotor position angle of induction motors with arbitrary stator windings
Author :
Holtz, Joachim ; Juliet, Jorge
Author_Institution :
Electr. Machines & Drives Group, Wuppertal Univ., Germany
Abstract :
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 three-phase motor cable by measuring the current derivatives. The method does not require additional wire connections. It is applicable to induction motors having stator windings connected either in wye or in delta. The results are supported by measurements from an experimental setup.
Keywords :
electric current measurement; induction motors; invertors; power cables; rotors; stators; switching transients; arbitrary stator windings; cage rotor; current measurement; induction motors; pulsewidth-controlled inverter; rotor position angle; sensorless acquisition; switching transients; three-phase motor cable; Anisotropic magnetoresistance; Induction generators; Induction machines; Induction motors; Pulse generation; Pulse inverters; Rotors; Signal generators; Stator windings; Testing; Delta-connected stator windings; induction motor; rotor anisotropy; sensorless position control;
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2005.858245