| 摘要 |
PURPOSE:To achieve a pulsing current-free feeding of a liquid, by storing rotation patters of a motor for feeding a liquid without pulsing current under various flow rates and back pressures to compute a rotation pattern of a motor in comparison of a detection signal with a memory signal. CONSTITUTION:A memory means 56 stores rotation patterns of a motor 30, flow rates and back pressures when a pulsing current-free liquid feeding is performed under various flow rates and back pressures. First, the pressure of a liquid is detected by a pressure detection means 60 under such a rotation pattern of the motor 30 as to let a fluid flow through a column 42 at a fixed flow rate and the detection pressure is defined as pressure in a reference section. Then, a comparison means 57 compares a pressure in a rotation pattern previously stored in a means 62 with the detection pressure. Receiving an output of the means 57, a computing section 58 determines a rotation pattern for the motor 30. A driving circuit section 59 rotates the motor 30 according to a rotation pattern signal being fed from the computing section 58. Thus, a liquid can be fed to a column 42 or the like without pulsing current.
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