Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1999-03-23
2000-08-15
Ro, Bentsu
Electricity: motive power systems
Induction motor systems
Primary circuit control
318809, H02P 2100
Patent
active
061041599
ABSTRACT:
A field weakening control method in an induction motor, wherein a voltage limit is set up in an oval while a current limit is established in a circle on a current plane, where x-coordinate represents a current value for flux portion and y-coordinate defines a current value for torque portion when the motor is in a normal state of constant speed and no load applied, to thereby form a current command according to a juncture thereof for generation of a torque, such that the oval voltage limit moves to a predetermined -(minus) quadrant against a coordinate representing the current value for torque portion in an excessive state where accelerated speed is formed or load is applied, to thereby cause torque of excessive state to increase in comparison with the normal state, such that there is an advantage in that torque is increased to improve an accelerated speed efficiency when the induction motor is under excessive state, and field weakening is conventionally controlled when the induction motor is under a normal state, thereby improving an efficiency during the excessive state and overall torque of the induction motor.
REFERENCES:
patent: 4088934 (1978-05-01), D'Atre et al.
patent: 4088935 (1978-05-01), D'Atre et al.
patent: 4310794 (1982-01-01), Akamatsu
patent: 5585708 (1996-12-01), Richardson et al.
Kim, S.H., et al., "Maximum Torque Control of an Induction Machine in the Field Weakening Region", IEEE Transactions on Industry Applications, vol. 31, No. 4, Jul./Aug. 1995, pp. 787-794.
Ro Bentsu
Samsung Electronics Co,. Ltd.
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