摘要 |
PROBLEM TO BE SOLVED: To provide a centrifugal pump device having improved safety in levitation and rotation of an impeller.SOLUTION: At least one of a first drive unit (coil 20) and a second drive unit (coil 20D) keeps the position of an impeller 10 at the center of the movable range of the impeller 10 in a direction along a rotational axis in a pump chamber 7, by adjusting suction force acting on a corresponding magnetic body among a permanent magnet 17 and a permanent magnet 17D with vector control. Consequently, even when a flow velocity, a rotational frequency, a pressure or the like varies, the position in an axial direction of the impeller 10 can be adjusted, while suppressing change of rotational torque of a motor.SELECTED DRAWING: Figure 19 |