Control of an Electromagnetically Actuated Resonance Punch
نویسنده
چکیده
In the area of metal forming the production of micro-components in huge quantities by cutting plays a central role. These components are often manufactured on modified mechanical high speed presses with stroke rates of up to 4,000 strokes per minute (spm) and punching forces of up to 2,000 kN. In terms of maximum cutting force and overall size of the punching machine, this may represent a significant oversizing, depending on the application. A better adaptability of the machine to the process could reduce production cost by lower space and energy consumption. To fulfill both requirements, a prototype of an electromagnetically driven punch machine with highly efficient resonance drive and miniaturization potential has been built at the Mechatronik Zentrum Hannover (MZH). The ram consists of a massspring system and is brought into resonance oscillations by an electromagnetic actuator. An advantage of this resonance propulsion is that only magnets with low nominal force are needed, since only small forces are necessary to replenish the energy lost by friction and the cutting process. A central role in this setup plays the power amplifier, which controls the magnet’s current. To achieve an optimal control performance under various hardware conditions, different energy-based control approaches are proposed in this paper.
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