| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor control device of a reciprocating compressor capable of reducing the stroke estimation errors attributable to the errors of the motor constant. SOLUTION: The motor control device includes a first stroke estimation unit 370 to estimate the first stroke by utilizing the motor current, the motor voltage and the motor constant of a compressor 300, a phase difference detection unit 360 to detect the phase difference between the first stroke and the motor current, and a search coil voltage detection unit 350 to detect the voltage of a search coil built in the motor. The motor control device further includes a counter-electromotive force operation unit 340 to operate the counter-electromotive force to be induced in the search coil from the voltage of the search coil, a second stroke estimation unit 330 to estimate the second stroke by utilizing the counter-electromotive force, and a control unit 320 to variably control the motor voltage or the motor operational frequency by using the result of comparison of the second stroke estimation value with the stroke command value. COPYRIGHT: (C)2004,JPO
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