| 摘要 |
A threaded fastener assembly tool is affixed to the output shaft of a DC motor, the torque of which is controlled by the current through the windings. An angular position encoder is attached to the shaft. A microprocessor monitors the angular position of the shaft as a function of time and controls a programmable current source which provides current to the windings of the motor. The processor varies the amount of torque applied to the fastener tool as a function of various parameters to control the installation of the fastener and detect defective fastener units.
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