Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1997-04-30
1999-01-19
Masih, Karen
Electricity: motive power systems
Induction motor systems
Primary circuit control
318727, 318798, H02P 126
Patent
active
058617280
ABSTRACT:
A method for readily measuring each motor parameter with high precision, with an induction motor at rest, and an apparatus for controlling the induction motor using these motor parameters are provided. The induction motor is set to a single-phase feed state or a feed state equivalent to that state. First, a stator resistance is measured from a current value and a voltage value at the time when a direct current command is given. Then, the current command of a current having an appropriately high frequency and a known current differential value is given to find a rotor resistance and a leakage inductance from current values and voltage values at two different times and the previously obtained stator resistance value. Then, the current command of a sine wave current having an appropriately low frequency is given to find a mutual inductance using the current value and the voltage value at the time. These measured values are used for a slip frequency operation and a speed estimation operation.
REFERENCES:
patent: 4670698 (1987-06-01), Fulton et al.
patent: 4672288 (1987-06-01), Abbondanti
patent: 5388052 (1995-02-01), Mann
Matsuura Sadahiro
Satoh Shigeru
Tazawa Toru
Masih Karen
Matsushita Electric - Industrial Co., Ltd.
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