Position Control of Air-cylinder with Piston Rotate Mechanism

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  • ピストン回転機構を持つエアシリンダの位置制御
  • ピストン カイテン キコウ オ モツ エアシリンダ ノ イチ セイギョ

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A new technique to make a precise position control of air-cylinder using an electric motor to rotate a piston is proposed. By rotating a piston, the friction of cylinder and piston becomes significantly small, which is about 40% in starting and 60% in continuous moving of those without a rotation. The control method is basically a PD high-gain feedback, but with dead-zone near zero to make a standstill positioning stably quiet. A motor is controlled to produce a minimum but enough rotation according to an axial trip of piston, where the rotation is activated a bit earlier than a valve opening. With these proposed techniques, an experimental device achieves 0.2[mm] deviation in ramp motion, series of 0.02[mm] step motion. The device is stable under a load of 25% of theoretical maximum output force. The hardness of position control is 50 times larger than a simple valve closed stopping. In these experiments, a power consumption of the motor is relatively small, which is about 2% of cylinder output.

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