A MATHEMATICAL MODEL AND A PROCEDURE FOR DESIGNING THE COMPLEX MAGNETIC SYSTEM OF A POLARIZED RELAY

摘要

A procedure for designing complex polarized magnetic systems is proposed. The key components of the procedure are an analysis of the magnetic field followed by the construction of two arrangements of the magnetic circuit. The first arrangement is constructed using the MMFs that replace the permanent magnets, with the deenergized control winding. The second arrangement contains the MMF of the control winding, assuming zero MMFs of the permanent magnets (that is, when they are demagnetized). Both arrangements take into account the leakage fluxes and the nonlinearity of the magnetic circuit reluctances. For calculating the magnetic fluxes two systems of nonlinear equations are constructed, which are solved simultaneously. The magnets can be magnetized in two ways: directly in the magnetic system of the device (the operating point lies on the demagnetization curve) and separately from the magnetic system (the operating point lies on the return curve).