Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2005-04-12
2005-04-12
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S727000, C318S803000, C318S811000, C318S813000
Reexamination Certificate
active
06879130
ABSTRACT:
A controller for a vector control of an induction motor, which is capable of easily determining a rotor resistance for use in calculation of a slip frequency. A temperature sensor is provided for detecting a temperature of a stator. Information on relation between the rotor temperature and the rotor resistance predetermined based on measurement is stored in a table. In driving the induction motor, the rotor resistance for the stator temperature detected by the temperature sensor is read from the table. A torque command I2is divided by a magnetic flux command Φ2and the obtained quotient is multiplied by the read value of the rotor resistance to obtain the slip frequency ωs, so that the vector control is performed based on the obtained slip frequency ωs. The value of the rotor resistance is easily determined by simply referring the table without complicated calculation. Since the stored information on the rotor resistance are based on measured values, a more precise value of the slip frequency is obtained to realize a precise vector control of the induction motor.
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Akiyama Takahiro
Iwashita Yasusuke
Tezuka Junichi
Fanuc Ltd
Leykin Rita
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