| 摘要 |
PROBLEM TO BE SOLVED: To pass an inclusion in a fluid in a center part of a fluid machine by arranging a fluid step difference part having a specified radius on a part of a static flow passage, and not having a fluid machine composing element in a specified range of a rotator. SOLUTION: When a control system 10 is passed from an outside current system 11 to a stator 4 lead current, a rotator 7 is rotated by a motor action between the stator 4 and a rotator 6. When rotation of the rotator 7 is started, the rotator 7 is moved by reaction. Since a flow passage step difference part 3 having a radius smaller than an outer peripheral radius R of a rotator is arranged on a part of a static flow passage, movement of the rotator 7 is restrained. A structure is not arranged in a range of 1/2 of the outer peripheral radius R of the rotator 7 from a rotary center of the rotator 7. A fluid and a part of solid which is included in the fluid can be passed without being brought into directly contact with the rotator.
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