The 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 built-in 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, treatment of the air gap, irregularities during construction, etc.
F.14 Improvements to existing production methods and tools or processes
COBISS.SI-ID: 18795286This patent application introduces certain modification of advanced hysteresis control (AHC) of resistance spot welding (RSW) system. The measurements of magnetic flux density itself is based on patent application described in the literature, which includes two measuring bridges to cower the possible unsymmetrical distribution of magnetic field inside the transformer iron core. The modified AHC is simple to apply in the practical application.
F.10 Improvements to an existing technological process or technology
COBISS.SI-ID: 19217942Monitoring system for welding transformer is capable of taking measurements and recording data of electrical values of welding transformer. After all it is possible to transfer data to the PC, convert them into DEC code and evaluate. On the base of obtained data it is possible to conclude about working of welding transformer during lifetime and diagnose possible failure.
F.06 Development of a new product
COBISS.SI-ID: 18535446Slovenian patent application comprises a description of the device and method for the determination of the microstructural properties of metallic materials, such as, for example, materials for the production of the iron cores of electromagnetic devices.
F.14 Improvements to existing production methods and tools or processes
COBISS.SI-ID: 1144746A device and a procedure is presented for saturation detection of a welding transformer’s iron core that solves the technical problem of the saturation detection of the welding transformers’ iron cores by utilising measurement of the primary current of the transformer. The existing solutions are based on the incorporation of additional sensors hence the device´s structure is modified. Amongst other consequences, these modifications may alter the properties of the device, increase its complexity, increase the production costs and reduce the robustness of the entire welding system. The presented technical problem is solved in an effective and inexpensive way that is based on an analysis of the measured primary current of the welding transformer. Using utilisation of the proposed solutions, additional sensors are unnecessary as measurement of the primary current is needed in any case due to other reasons, such as control of the welding current, protection, diagnostics, etc. In this way, the additional components within the welding systems are unnecessary. Therefore, all negative effects and aspects of usage of these components involving additional sensors and auxiliary devices for the saturation detection of the magnetic cores of the welding transformers are avoided.
F.06 Development of a new product
COBISS.SI-ID: 19680022