Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1989-04-19
1993-04-27
Wysocki, A. Jonathan
Electricity: motive power systems
Induction motor systems
Primary circuit control
318268, H02P 300
Patent
active
052065740
ABSTRACT:
A vector control apparatus for an induction motor that controls the speed of the induction motor by providing the motor with a speed command and a secondary magnetic flux command from outside. The vector control apparatus includes a vector control system operative in such a way as to maintain a vector relation equation between a torque current, an exciting current, a slip speed, a secondary magnetic flux command, on the one hand, and a torque T, on the other, of the induction motor; and memory system means for storing a predetermined relationship between the torque T, the detected speed value .omega..sub.r, of the motor, and the secondary magnetic flux command obtained from the vector control system. The torque T obtained from the vector control system is inputted to the memory system and the secondary magnetic flux is outputted and fed back therefrom to the vector control system. In the predetermined relationship, when he torque T is large, the secondary magnetic flux .phi..sub.2 is increased in such a way as to reduce the slip speed within a range where the motor loss L to the torque T ratio (T/L) can reach the maximum value, and when the torque T is small and the speed is less than a predetermined value, the secondary magnetic flux .phi..sub.2 is reduced in such a way as to increase the slip speed and reduce the speed ripple within the range where the motor loss L can be allowed.
REFERENCES:
patent: 4392100 (1983-07-01), Stanton et al.
patent: 4456868 (1984-06-01), Yamamura et al.
patent: 4672287 (1987-06-01), Fujioka et al.
"Modern Technology Series", 1982.
Amagai Hideyuki
Okamoto Kiyokazu
NEC Corporation
Wysocki A. Jonathan
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