A NEW DESIGN OF PRIMARY TORQUE STANDARD MACHINES |
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| H. Gassmann, T. Allgeier, U. Kolwinski |
- Abstract:
- GTM have developed a primary torque standard which covers the range from 1 Nm to 1 kNm with a single load frame and only one weight stack per direction of operation. The design comprises a double-sided lever, supported on straincontrolled elastic hinges, a binary weight stack of exchange disk design for each direction, mounting accessories for the transducer under test and a counter-torque drive with servo-controller. Compared to conventional types with air bearings and a multitude of several stacks, the chosen design offers distinctive advantages:
Higher reliability of the lever support, less complicated auxiliary systems, easier method of operation, low overall height. Calculations show that the parasitic moment of the crossed hour-glass shaped springs for the lever support can be controlled to less than 10-5 N·m for a 1 kN·m machine, and that the uncertainty of lever length falls within a 20 ppm band, including the equality of both sides. Using the same principle of elastic hinges, the overall torque range can be increased to stretch from 0.1 N·m to over 20 kN·m, with only two separate load frames. - Keywords:
- torque measurement, primary standard, deadweight
- Download:
- IMEKO-WC-2000-TC3-P070.pdf
- DOI:
- -
- Event details
- Event name:
- XVI IMEKO World Congress
- Title:
Measurement - Supports Science - Improves Technology - Protects Environment ... and Provides Employment - Now and in the Future
- Place:
- Vienna, AUSTRIA
- Time:
- 25 September 2000 - 28 September 2000