Torque Analysis for Rotational Devices with Nonmagnetic Rotor Driven by Magnetic Fluid Filled in Air Gap

In magnetomechanical applications, it is necessary to calculate the magnetic force or torque of specific objects. If fluid involved, and also include effect pressure caused by fluid. The standard method solve Navier–Stokes equation. However, obtaining body density still under controversy. To resolve this problem, paper shows that calculation these applications should not only use method, but consider mechanical using an indirect approach, such as virtual work principle. illustrate this, we experimental motor made a nonmagnetic rotor immersed in Then, show principle appropriate approach can output due Numerical analysis results validity approach. addition, explain how transmits its stator rotor, respectively.