Rotor time constant adaptation for induction motor in vector con

Details Rotor time constant adaptation for induction motor in vector con Rotor time constant adaptation for induction motor in vector con

1993-03-31

1995-12-19

Stephan, Steven L.

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes control for power source of drive-means

318807, B66B 124

Patent

active

054761581

ABSTRACT:
Torque current reference I.sub.Tref and reference acceleration a.sub.ref are sampled in a vector controlled induction motor drive for developing a quality criterion by which an estimated rotor time constant .tau..sub.2 may be adapted to the actual rotor time constant .tau..sub.2. More specifically, the torque current reference I.sub.Tref and reference acceleration a.sub.ref are sampled and then a slope of I.sub.Tref versus a.sub.ref is plotted against the offset of that line, which offset is proportional to the lead torque T.sub.LOAD. The no-load slope is then determined from this plot and subtracted from an ideal no-load slope and the difference passed through a proportional-integral circuit for providing an estimated rotor time constant .tau..sub.2 which is adapted to the actual rotor time constant .tau..sub.2.

REFERENCES:
patent: 4677360 (1987-06-01), Garces
patent: 4885519 (1989-12-01), Vogelmann
patent: 5076399 (1991-12-01), Horbruegger et al.
patent: 5334923 (1994-08-01), Lorenz et al.

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