Analysis of Influence of Austenitic Stainless Steel Magnetic Steel Sheath on Electromagnetic Properties of Motor
Magnetic steel sheath not only plays a shielding role in high-frequency magnetic field,but also has a strengthening,protection and good heat dissipation effect on magnetic steel,and helps the motor as-sembly process.Since the non-magnetic magnetic steel sheath does not affect the electrical gap and output characteristics of the motor,non-magnetic austenitic stainless steel is widely used in the magnetic steel sheath.However,the thin material composition or improper heat treatment of stainless steel raw materials in the process of smelting or forging,so that a small amount of ferrite or martensitic organization will appear in austenite,resulting in weak magnetism of the magnetic steel sheath,thus affecting the electromagnetic output characteristics of the motor.In this paper,a distributed brushless DC torque motor and a packaged brushless DC torque motor were respectively taken as examples.The solution domain of the two-dimensional finite ele-ment simulation physical model of the brushless DC torque motor was established based on Flux and Ansys,and the influence of austenitic stainless steel magnetic steel sheath on the electromagnetic properties of the torque motor was analyzed.Finally,an engineering prototype was developed.By comparing the simulation data with the measured data,the precise design margin of austenitic magnetic steel sheathed torque motor was defined,which provided a certain engineering design significance and theoretical basis for the initial stage of the motor project development.
magnetic steel sheathaustenitic stainless steeltorque motorelectromagnetic properties
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