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This paper deals with the control improvement of a middle-frequency resistance spot welding system. This is achieved by a combined closed-loop control of the welding current and closed-loop control of the iron core saturation level. The proposed control assures a very short rise time of the welding current and the best possible utilization of the transformer iron core.
In the paper induction machine (IM) torque control is studied as an example of a three-dimensional non-holonomic integrator that includes drift terms. By expanding Brockett's controller derived for the driftless systems, a control structure is proposed that guarantees natural adjustment of both the amplitude and the frequency modulation of the sinusoidal stator current vector. The rotor flux linkage...
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