| 摘要 |
PURPOSE:To make energy-conserving control possible by setting the armature-current value which is constantly controlled in a low-torque region at a value lower than the rated value, and reducing the fixed loss in the region wherein the torque command value is small. CONSTITUTION:The output signal from an operation amplifier OA1 in a torque command generator 100 is inputted to an operation amplifier OA2 of a field-circuit- function generator 200 and an operation amplifier OA3 of an armature-circuit-function generator 300. Said field-circuit-function generator 200 is a saturating circuit comprising said operation amplifier OA2, diodes D1 and D2, resistors 201-212. A field-current command if is flowed through a current-command winding 213. Said armature-circuit-function generator 300 is a blind-zone circuit comprising said operation amplifier OA3, diodes D3-D7, transistors Tr3 and Tr4, and resistors 301- 314. A command current ia2 is flowed through an additional current command winding 315, and a current ia1 is flowed through a fixed-value setting resistor 317, so that the fixed armature current becomes a value below the rated value. |
