| 摘要 |
<p>A reciprocation type compressor driving unit free from start failure. A position established by moving (theta init) about 45º in a direction of rotation is the best start initial position with a line connecting a piston (107)-compression upper dead point-lower dead point in a reciprocation type compressor (15) taken as a reference; therefore, as start motor constants for moving a rotor (117) to this start initial position, a rotation initial position (theta init), a start acceleration speed (omega init), a start d-axis current (I dinit), and a start q-axis current (I qinit) are set. Before starting, a drive current is passed through one phase of a compressor motor (28) on the basis of the start motor constants, with the position of the rotor (117) being caused to stand by at the start initial position. Thereafter, starting is initiated from this start initial position, whereby normal starting can be effected with the rotor (117) being in either start position.</p> |
