CALCULATION OF MAGNETIC FIELD IN BRUSHLESS ELECTRIC MOTORS WITH CLOSET GROOVES TAKING INTO ACCOUNT NOTLINEAR MAGNETIC CHARACTERISTICS

The calculation of the magnetic field is one of the promising ways to engine diagnostics, because the basic process-es in electrical machines is related to the magnetic field. We consider an electric motor with stator and rotor. Design feature of the present electric motor is the presence of ferromagnetic thin jumper between the stator winding and the gap in the stator and rotor. In nominal mode, the motor ferromagnetic material from which it is made is included in the state of magnetic saturation. This is to a significant reduction in shunting the magnetic flux of the stator currents and permanent magnets these bridges, insight magnetic material which is close to the value of the magnetic permeability of air. This makes it necessary to take account of the nonlinear magnetic characteristics of the material in the calculation of the average motor torque provided by the design. Three-dimensional and two-dimensional mathematical model for calculating the characteristics of the magnetic field in Brushless DC electric motor with closed grooves taking into account notlinear magnetic characteristics has been developed on the basis of method of secondary sources. The advantage of the method of secondary sources is narrowing the search area of unknown.