| 摘要 |
PURPOSE:To execute a measurement with much higher accuracy than before, and also to improve remarkably the efficiency for measurement by providing a motor for rotating an object to be measured, and a means for measuring a time when this motor reaches a prescribed revolving speed. CONSTITUTION:An object to be measured 4 is placed on a motor 5 so that the rotation of the motor 5 is detected by a frequency generator 6, and its output frequency is converted to voltage by an F/V converter 7. When the motor 5 reaches some revolving speed and the frequency of the frequency generator 6 is F/V-converted, and when a time when its voltage becomes equal to voltage of a reference power source 8 is denoted by tx, in that case, an output of a comparator 9 is changed to ''Lo''. That is to say, no current flows to a constant-torque driving device 11. Therefore, basing on this time, this device measures the inertia moment of the object to be measured, and accordingly, the inertia moment can be measured with much higher accuracy than before.
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