Patent ID: 8061028

Claim:
A fixed scroll positioning apparatus for positioning a fixed scroll on the basis of a positional relationship between a rap of the fixed scroll and a rap of a movable scroll in an assembling process of a scroll fluid machinery, comprising: a fixing member for fixing an assembly body composed of an integrated combination of the movable scroll, a crank shaft engaged with the movable scroll, a housing member serving as a bearing for the crank shaft, and a drive motor for driving the crank shaft; power supply means for supplying electric power to the drive motor to shift the movable scroll of the assembly body; determining means for determining a stirring distance and a stirring direction of the fixed scroll by shifting the movable scroll engaged with the fixed scroll; and a stirring mechanism for stirring the fixed scroll according to the stirring distance and the stirring direction determined by the determining means, wherein the power supply means includes an inverter for supplying power to the drive motor and a driver for controlling operation of the inverter, the driver determines an instruction value relating to an output current value and an output frequency of the inverter such that the drive motor rotates at a predetermined rotation speed, the driver controls operation of the inverter such that the output current value and the output frequency of the inverter correspond to the instruction value, the determining means detects change in rotational toque of the drive motor on the basis of change of the instruction value relating to the output current value of the inverter determined by the driver, the determining means determines the stirring distance and the stirring direction of the fixed scroll on the basis of change in rotation torque of the drive motor, and the drive motor is included in the assembled scroll fluid machinery.