Patent ID: 9442052
Filing Date: 2016-09-13
CPC Classification: G01L,G01M,G01N

Claim Text:
1. A torsion tester comprising: three or more driving units each of the driving units being configured to connect with and rotate a corresponding one of three or more input/output shafts of a test body, respectively; and a controller configured to individually control each of the three or more driving units to be driven with one of individually-set rotational frequencies and individually-set torques, respectively, each of the three or more driving units being controllable with an individually-varying rotational frequency during a test, wherein the three or more driving units comprise: a first driving unit configured to connect with an input shaft of the test body; and two second driving units configured to connect with output shafts of the test body, and wherein the controller is configured to: record a setting value of a rotational frequency difference between the two second driving units and a setting value of a sum of the torques to be applied to the two second driving units; and set respective torques to be applied to the output shafts of the test body based on the recorded frequency difference while keeping constant the sum of the torques to be applied to the two second driving units.