| 摘要 |
PROBLEM TO BE SOLVED: To solve a matter that regenerative power may be generated under impact of quantization error in speed operation when a motor is entering a substantially no-load state and performing regenerative operation with a torque command 0 from a light load regenerative torque command operating unit, and it increases DC voltage and stringing voltage thus causing overvoltage. SOLUTION: A flux command operating unit for operating a correction flux commandϕs from the output of a light load regenerative torque command operating unit, i.e. a limit torque commandτs, and a flux commandϕ<SP>*</SP>is provided additionally, and the correction flux commandϕs is inputted to a torque control means in place of the flux commandϕ<SP>*</SP>. COPYRIGHT: (C)2006,JPO&NCIPI
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