| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem wherein there is a risk of becoming unable to smoothly and surely start operation, and not realizing the optimization of phase difference when switching from the synchronized start-up to the operation of rotor position detecting, depending on the magnitude of the load at the start-up. SOLUTION: When switching from the synchronized start-up to the operation of rotor position detection, the electric current in a bridge inverter is reduced gradually for solving the problem, thereby enabling smooth and sure start-up since the phase difference when switching from the synchronized start-up to the operation of rotor position detecting can be rendered as being optimum. |
