| 摘要 |
PROBLEM TO BE SOLVED: To provide a control method of a compressor motor free from the generation of an out-of-control state. SOLUTION: In this control method of the compressor motor 14 used in a case when the load is a compressor, and the operation is transferred from a steady operation mode for performing high-speed operation with frequency F1, and a low-speed operation mode with low frequency F3, an intermediate frequency F2 between the frequency F1 and the frequency F3 is determined, the frequency is lowered at a high speed from the frequency F1 to the frequency F2, the frequency is lowered at a low speed from the frequency F2 to the frequency F3 to switch a rotating speed of the compressor motor 14 to a low-speed operation in a short time while preventing the excess phenomenon of DC current. |
