The LWA 4 Powerball Light-weight-arm sub-system by Schunk (Germany) has been designed for stationary and mobile applications in service robotics and industrial handling. The arm features a weight/payload ratio of 2:1 and with a dead weight of 12 kg. It can dynamically handle loads of up to 6 kg, and has a gripping radius of more than 700 mm.
DUE TO THE COMPACT DESIGN OF THE front end, or wrist joint, the arm can be easily maneuvered in close spaces. Its repeat accuracy of 0,06 mm provides for high process stability. The design prevents dangerous crushing and shearing movements, making it safe to use around people as well. Central elements of the lightweight arm are three compact ERB Powerball modules, which combine the movements of two axes.
The entire electronic control circuitry is integrated in the drives, which supports position, velocity, and torque controlled motions. The quick-change system with integrated signal feed-through allows for commissioning of the Plug & Performance gripping system. Since the supply lines for gripper and tools are completely within the module, there are no interfering cables on the peripheral devices. Due to the integrated micro-controller, the optional CANopen interface, and the cabling for data transfer and power supply, the arm can be integrated in existing control concepts. An industrial robot controller featuring an integrated PLC-software (Codesys) supplements the manipulator. Teaching and instruction is supported by means of a hand-held control panel with a touch-screen display.
The 24-VDC supply voltage enables mobile use as well as use at changing locations. Consistent lightweight construction and the state-of-the-art torque motors keep the energy demands of the lightweight arm down to an average of 80 W. That lowers energy costs, provides for longer work periods when using rechargeable batteries, and also allows the use of small-format batteries.
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