Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2007-01-09
2007-01-09
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S721000, C318S701000
Reexamination Certificate
active
11266385
ABSTRACT:
A lead-angle control device according to the present invention includes: a space voltage vector controller calculating effective vector application times necessary for obtaining output voltage vectors of an inverter from stationary-coordinate-system instruction voltage components; a lead-angle compensator comparing the sum of the effective vector application times with a sampling period, and generating lead-angle compensation values; a speed controller generating an instruction current for compensating an error caused by a difference between an instruction speed and a current speed; an instruction current generator which generates a rotating-coordinate-system instruction current component by extracting a lead-angle component at a point where maximum torque-per-ampere can be obtained from the magnitude of the instruction current and performing a mathematical calculation on the magnitude of the instruction current and a lead-angle component; and an instruction voltage generator generating a stationary-coordinate-system instruction voltage component from the rotating-coordinate-system instruction current component.
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Kim Tae-kyung
Kim Tae-won
Park Sung-min
Yang Soon-bae
Colon Santana Eduardo
Donovan Lincoln
Greenblum & Bernstein P.L.C.
LG Electronics Inc.
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