| 摘要 |
PURPOSE:To measure the unbalance level of a test object accurately eliminating any problem of friction, by blowing a fluid against the end face of the rotating shaft thereof to restrict the axial movement thereof. CONSTITUTION:A tester has nozzles 6L and 6R facing the end face of the rotating shaft 3 of a test object 2 such as motor armature and a fluid supply source, for example, air compressor. Then, as the test object 2 is turned with a belt 1, an axial thrust is generated in the test object 2, forcing it to move axially. So, an compressed air of an air compressor is jetted from nozzles 6L and 6R against the end face of the rotating shaft 3 to make the thrust of the test body 2 balance with the thrust of the compressed air so that the axial movement of the test object 2 will be restricted to retain it at a specified position. thereafter, the centrifugal force or vibration of the test object 2 is detected to measure the unbalance level thereof 2. This eliminates the problem of friction and only the viscosity resistance of the compressed air affect the rotation, centrifugal force and vibration of the test object 2 thereby enabling accurate measurement of even the finest unbalance of the test object 2 with limited weight. |
