Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1997-10-03
1999-09-28
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
H02P 528
Patent
active
059594314
ABSTRACT:
Index signals which represent the degree of instability in a three-phase induction motor system is derived by using phase current signals which are usually already available in V/Hz PWM inverters for other purposes. Proportional integration compensators, which may be implemented in software, process these index signals and generate frequency and/or voltage adjustments to the V/Hz controller in order to compensate for speed instability in the system. The compensation algorithm is robust to system changes and is also effective to improve acceleration and deceleration performance.
REFERENCES:
patent: 5585708 (1996-12-01), Richardson et al.
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Morris Lockwood, Simulation of Unstable Oscillations in PWM Variable-Speed Drives, IEEE Transactions on Industry Applications, vol. 24, No. 1 (Jan./Feb. 1988).
Ryuzo Ueda, Stability Analysis in Induction Motor Driven by V/f Controlled General--Purpose Inverter, IEEE Transactions on Industry Applications, vol. 28, No. 2 (Mar./Apr. 1992).
Nobuyoshi Mutoh, Stabilizing Control Method for Suppressing Oscillations of Induction Motors Driven by PWM Inverters, IEEE Transactions on Industrial Electronics, vol. 37, No. 1 (Feb. 1990).
Marek Budzisz, Stabilization Procedures Based on Fuzzy Inference Algorithms for PWM Drives, The Institue of Electrical and Electronics Engineers, Inc. (1995).
Paul C. Krause, Analysis of Electric Machinery, The Institute of Electrical and Electronics Engineers, Inc., New York.
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Baldor Electric Company
Duda Rina I.
Shoop Jr. William M.
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