| 摘要 |
PROBLEM TO BE SOLVED: To provide a small-sized inexpensive rotary viscometer having a simple structure and an excellent transmission efficiency of a rotary motion, and drivable with high angle resolution. SOLUTION: The external cylinder 6 of a coaxial double cylinder 5 of this rotation viscometer 1 is gripped by a gripping device 11 fixed on the rotating shaft of a step motor 12, and the step motor 12 is driven by a current from a current amplifier 22 to thereby rotate the external cylinder 6. A fluid 8 to be measured in the external cylinder 6 is rotated by rotation of the external cylinder 6, and the internal cylinder 7 placed therein is also rotated by the torque caused by viscosity of the fluid to be measured. The rotational position of a rod 14 by the torque is detected by a rotational position detector 15, and a control device 20 controls a current supplied to a coil of a torque application means 16 so as to return back the rotation to the original state, and the viscosity of the fluid to be measured is detected by the current. The control current of the step motor 12 is supplied by adjusting a signal from the control device 20 by a DA amplifier 21 and a current amplifier 22. COPYRIGHT: (C)2005,JPO&NCIPI
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