System for speed-sensorless control of an induction machine
AssigneeGeneral Electric Company
InventorPatrick Lee Jansen
Life of this patent
Estimating the term…
Abstract
A system for speed-sensorless control of an induction machine includes a flux regulator & torque current calculator for operating the machine in a heavily saturated state to produce a saturation induced saliency; a saliency tracker for tracking an angle of the saturation-induced saliency; a signal injector for injecting an AC signal aligned with a saliency axis; voltage and current determiners for determining stator voltages and currents; and a rotor flux calculator for using the saturation-induced saliency angle, the determined stator voltages, and the determined stator currents to determine a magnitude and a location of a rotor flux vector. The flux regulator & torque current calculator is adapted to use the rotor flux vector to control the induction machine.
Claims20
A drive system for an induction machine comprising:
- a saliency tracker for tracking an angle of a saturation-induced saliency in a stator transient inductance;
- and
- a signal injector for aligning an injected AC signal with the tracked saturation-induced saliency angle and adding the aligned injected AC signal to a fundamental AC signal.
A method for driving an induction machine comprising:
- operating the machine in a heavily saturated state to produce a saturation induced saliency in the stator transient inductance;
- tracking an angle of the saturation-induced saliency in the stator transient inductance;
- aligning an injected AC signal with the tracked saturation-induced saliency angle;
- and
- adding the aligned injected AC signal to a fundamental AC signal.
A drive system for an induction machine comprising:
- means for operating the machine in a heavily saturated state to produce a saturation induced saliency in the stator transient inductance;
- means for tracking an angle of the saturation-induced saliency in the stator transient inductance;
- and
- means aligning an injected AC signal with the tracked saturation-induced saliency angle and adding the aligned injected AC signal to a fundamental AC signal.
Dependencies are inferred from the claim text.