Bulk workpiece picking system and method

A picking method in a bulk workpiece picking system including:

• a robot which is provided with an electromagnetic hand configured to magnetically attract a metal workpiece;
• a detector configured to determine whether or not a magnetic attraction in which the metal workpiece is magnetically attracted to the electromagnetic hand is performed by detecting the magnetic attraction;
• and a controller configured to control a magnetic force of the electromagnetic hand, the picking method comprising:
• setting, by the controller, a magnitude of magnetic force of the electromagnetic hand so that the electromagnetic hand can suspend one workpiece and cannot suspend two metal workpieces;
• magnetically attracting, by the robot, the metal workpiece to the electromagnetic hand;
• determining, by the detector, whether or not the magnetic attraction is performed;
• and
• increasing, by the controller, the magnetic force of the electromagnetic hand when it is determined by the detector that the magnetic attraction is performed.