This patent protect the developed advanced control system for spot welding transformer, which is based on measurement of welding current and flux density in the transformer iron core. The welding current at the full–wave rectifier output is normally controlled by the pulse width modulated primary voltage of the transformer supplied by the input converter. The unequal ohmic resistances of the two transformer’s secondary circuits and the different characteristics of the diodes of output rectifier certainly lead to the magnetic saturation which, consequently, causes the unwanted spikes in the transformer’s primary current and over–current protection switch–off. This disadvantage of classical spot welding systems is completely eliminated by the protected advanced hysteresis controller (AHC), which keeps transformer iron core saturation within prescribed bounds regardless of how unequal the ohmic resistances and diode characteristics in the transformer’s secondary circuits are. 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 AHC assures a very short rise time of the welding current and the best possible utilization of the transformer iron core.
F.06 Development of a new product
COBISS.SI-ID: 15194902The device for the detection of angle between two magnetic fields works indirectly by the measurement of the magnetic fields by the Hall sensors. The device is applicable for the determination of the correctness of the stator winding connection of different AC electrical machines, which are either cylindrical or linear.
F.06 Development of a new product
COBISS.SI-ID: 12359446The invention relates to a winding element for conducting current, forming a component of a coil winding, especially of a (welding) transformer winding, comprising fixing means for fixing the winding element to a carrier component. The invention also relates to a transformer arrangement, especially a welding transformer arrangement, comprising a primary winding and a secondary winding, the primary and/or secondary winding comprising at least one winding element according to the invention.
F.07 Improvements to an existing product
COBISS.SI-ID: 15194134A semiconductor module for connecting to a welding transformer winding includes a semiconductor component that is discshaped and disposed between two contact plates. One of the contact plates is acted upon using a cooling fluid on its side facing away from the semiconductor component.
F.06 Development of a new product
COBISS.SI-ID: 15194390The tester and the procedure of testing to determine the quality of magnetic circuits is based on pulse excitation and hysteresis control of primary current. The magnetic characteristic of the tested transformer iron core is evaluated on the basis of measured frequency of excitation and measured reactive power. The corresponding working point and tester operating range is chosen by changing the number of primary winding turns and by selecting switching current and voltage. All tests are performed by the standard existing inverter, so that there is no need for an expensive additional testing equipment. Transformer core testing is quick, effective and universal. The tests of already builtin cores are also possible. The entire magnetic circuit is evaluated by the described procedure taking into account influence of many factors, such as the type of material, lamination tickness, damages, the increased air gap due to the manufacturing process, irregularities during construction, etc.
F.17 Transfer of existing technologies, know-how, methods and procedures into practice
COBISS.SI-ID: 16805654