| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a vector control inverter which is excellent in starting performance by increasing the circulation time of a current flowing in a resistor for current detection arranged in an inverter bus, and enabling the current detection and stabilizing a motor current in positioning and synchronous operation. <P>SOLUTION: This controller reproduces the current of one phase of a motor by detecting an inverter output current in reference to the voltage across a resistor for current detection arranged in the inverter bus, when positioning a rotor at start of synchronous operation, and besides this corrects a d-axis voltage command so that the detected value of the d-axis current may conform to a specified d-axis current command prior to performing positioning, and this shunts a current from specified one phase to other two phases so that the current flowing to the specified one phase of a three-phase inverter circuit may flow half each to other two phases. Moreover, in the period of synchronous operation, this corrects the induced voltage constant of the voltage equation of the synchronous motor so that the detected value of the d-axis current may conform to the specified d-axis current command, and performs synchronous operation. <P>COPYRIGHT: (C)2004,JPO |
