| 摘要 |
PROBLEM TO BE SOLVED: To improve the operating efficiency and reduce the inverter capacity by enabling an internal constant, including the property of the ratio of plural sets of output voltage, which are set according to the drive situation of the motor, to the output frequency to be switched even in operation of an inverter, according to tan operation mode, and judging the rationally of the above ratio property to be set. SOLUTION: A plurality of internal constants, including the relation between the output voltage and the output frequency for the inverter control to materialize the torque property of a motor 3 and operate it efficiently and suppress the rise of DC voltage and the control constants such as acceleration time, deceleration time, etc., are set in the storage area of an inverter 2. The V/F property is switched according to the operation conditions, corresponding to the motor 3 to be driven, and also the selection of the function of the V/F property is enabled by the torque property of a loading machine 4, consequently the operation efficiency can be improved and the capacity of the inverter 2 can be reduced, by selectively switching arbitrarily the V/F property of the inverter 2 during operation, according to different operation modes. |
