Active magnetic bearing design study

Abstract

The purpose of this paper is to propose a useful method to implement active magnetic bearings (AMBs) on an existing\ud rotating shaft which rotates on conventional bearings. This is feasible if AMBs can produce the same reaction loads of\ud conventional ones and if the size of vane is large enough to host an AMB. As this substitution could offer some difficulties\ud due to the different size between magnetic bearings and conventional ones, a set of equations are performed to show\ud that a variation of some parameters can solve this problem. The journal ratio is the geometrical parameter introduced to\ud develop the present analysis. The variation of journal ratio does not produce a variation of the pole’s surface so that the\ud reaction load does not change. The results are analyzed by numerical analysis by mathematical relationships involving the\ud design parameters, magneto-static simulations and dynamic simulation on shaft when it is tested by disturbance rejection\ud and reference tracking input in order to analyze the differences on dynamic behavior of the shaft on its suspended\ud sections. Results show that the displacement pattern of the suspended sections remains unchanged, confirming that the\ud reaction load, produced by pole expansion, remains the same varying the journal ratio

Current density produced by induced magnetic field incident on thermoelectric generator (TEG) tile

“…The magnetic field lines depart orthogonally from one pole shoe and reach the other pole shoe, ideally, orthogonally. This is valid only in a region far enough from the boundary of the pole shoe, [29,30]. The pole shoes are winded by two coils connected in series in order to give the highest value of the magnetic field located at the center of the SF where the capacitors plate is located.…”

Axial active magnetic bearing design

“…The dynamic response is not affected by the parameter because the system maintains the eigenvalues constant -the failure to do so in Figure 9 means that the step response should have exhibited a different pattern in order to reach the steady-state position. The system follows the same results of Barbaraci et al (2012):…”

“…Obviously no levitation would be stable without a control system (Schweitzer and Maslen, 2009). Barbaraci et al (2012) analyzed the influence of optimal design on magnetic line pattern. Because of several possible AMB configurations for the particular application, the designer needs to be supported by modeling and simulation tools.…”

Decoupling control of magnetically suspended motor rotor with heavy self-weight and great moment of inertia based on internal model control

“…The magnetically suspended rotational machine has been widely applied in high-speed motors (Li et al, 2020), centrifugal compressors (Han et al, 2016), pumps (Asama et al, 2014; Masuzawa et al, 2003; Wang et al, 2019), and robot system (Cole and Fakkaew, 2018) because of its advantages on controllability (Barbaraci, 2016; Xiang and Tang, 2015), zero-friction (Barbaraci et al, 2013; Xiang and on Wong, 2019), and lubrication-free (Cui and Cui, 2017). The PID control is a common method (Ahrens et al, 1996; Parada et al, 2017; Tang et al, 2017; Wei and Söffker, 2016) to realize the displacement control of the magnetically suspended motor (MSM) rotor.…”