Pole tower bolt electric torque wrench and control method thereof

Abstract

The invention discloses a pole tower bolt electric torque wrench and a control method thereof. According to the current motor torque and the flux linkage, the motor torque and the flux linkage at thenext moment under different voltage vectors are predicted according to the Eulerian method and a mathematic model of a permanent magnetic synchronous motor, objective function values under the different voltage vectors are calculated according to a wrench target torque value, a stator target flux linkage value and the predicted motor torque value and the flux linkage value at the next moment, andthe voltage vector making an objective function optimal is selected as the voltage at the next moment. A traditional PI regulator is replaced through a prediction model of a stator current and the flux linkage, torque response is fast, and the pole tower bolt electric torque wrench is of good significance to fastening of a pole tower bolt; and by constructing the suitable objective function, everystep of control of a driving motor meets the optimal condition for controlling a target, and the output torque of the pole tower bolt electric torque wrench is controlled in a high-precision mode.

Description

technical field [0001] The invention relates to an electric torque wrench for tower bolts and a control method thereof, belonging to the technical field of electric torque wrench. Background technique [0002] When the tower bolts are fastened, there are high requirements for the fastening torque value and precision. On the one hand, if the torque value is too large, the bolt may be stretched or brittle; on the other hand, if the torque value is too small, the bolt may become loose. In addition, at the height of the transmission tower, the wind disturbance is greater, the tower galloping range increases, and the safety risk is more prominent. Therefore, high-precision torque control is required. [0003] Common electric torque wrench control methods in the prior art are generally current type or impact type. The current of the current type electric wrench rises sharply at the moment of bolt tightening, so the output torque fluctuates greatly. The impact electric torque wr...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the defects of low torque control accuracy and large fluctuations of the existing electric wrench, and provide an electric torque wrench for pole tower bolts, which uses a model predictive control method to realize the torque control of the pole tower. High-precision Control of Output Torque of Bolt Electric Torque Wrench

Images