Adaptive control of an active magnetic bearing with external disturbance

Dong, Lili; You, Silu

doi:10.1016/j.isatra.2013.12.028

Cited by 45 publications

(28 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…According to Schweitzer and Maslen, [3] Roy et al, [22] and Dong and You, [26] the resultant electromagnetic force, in newtons, produced by the actuator and felt by the element adjacent to it is given by Equation 1, where B is the magnetic flux density of the magnetic field, in tesla; A is the area of each pole of the ferromagnetic core, in meter 2 ; and μ 0 is the magnetic permeability of the air, in Henry/meter.…”

Section: Electromagnetic Forcementioning

confidence: 99%

“…Therefore, the resultant force F can be simply given by a subtraction [3,20,22,26] between its components F 1 and F 2 , as presented in Equation 10.…”

Section: Differential Assemblymentioning

confidence: 99%

“…[3,22,26] Both these coefficients depend exclusively on the parameters of the actuator and, once their values are determined, they remain constant. Considering the definitions of the current and position stiffness, the force F may be written in terms of k i and k x as in Equation 14.…”

Section: Differential Assemblymentioning

confidence: 99%

See 2 more Smart Citations

Electromagnetic actuators for controlling flexible cantilever beams

Martin

Mendes

Cavalca

2017

Struct Control Health Monit

View full text Add to dashboard Cite

Electromagnetic actuators are very important for scientific and industrial applications. Their use may vary within a wide range of possibilities due to their most important feature: the ability to apply known and controllable forces to elements or structures without contact. In this article, an application within this range is analyzed: a proportional-integral-derivative (PID) controller is used with a pair of actuators to control the dynamic forced response of a flexible cantilever metallic beam and to keep it at a given reference position. In order to achieve this objective, both the actuators and the controller need to be adjusted. For the actuators, the main parameters evaluated consider mounting particularities, such as the differential assembly and the influence of the air-gap distance over the magnetic flux density and the magnetic force provided. Next, a brief review of PID controllers is pre- | INTRODUCTIONMagnetic actuators are components with a wide range of possibilities whose application field has been growing year after year. [1][2][3] In fact, the main feature of interest in these components is the ability to apply known and controllable forces over many types of elements and structures with no need of contact and no need of any kind of material medium. In this sense, magnetic actuators are a good alternative for common mechanical components. A simple example is a growing field of research and application on magnetic gears. [1,4] These gears offer clear advantages over their mechanical counterparts such as contactless torque transfer, lower maintenance, inherent overload protection, and physical isolation between input and output shafts, being suitable in a market that desires more efficient and reliable gears. Another example of magnetic actuators competing with mechanical devices occurs with magnetic bearings (both active and/ or passive). [1][2][3] These bearings also have some advantages [5] : besides allowing oil-free machines, magnetic bearings are frictionless (and therefore have low-power losses and no wear), allowing high rotational speed. Besides, the bearings can be remotely controlled and are good monitoring devices (because the bearing forces can be properly measured). Therefore, in the field of magnetic bearings, there are some interest applications. Among these, one may find flywheels for kinetic energy storage as peak power buffer units (i.e., for supplying energy on demand peaks) in vehicle applications, [1,6,7] in oil drilling platforms, [8] and even in electric power network applications. [9] Due to its operation characteristics, it is desirable that flywheels rotate at higher speeds and, if a long-term energy storage is needed, low-energy consumption during storage

show abstract

Section: Electromagnetic Forcementioning

confidence: 99%

“…Therefore, the resultant force F can be simply given by a subtraction [3,20,22,26] between its components F 1 and F 2 , as presented in Equation 10.…”

Section: Differential Assemblymentioning

confidence: 99%

See 1 more Smart Citation

Electromagnetic actuators for controlling flexible cantilever beams

Martin

Mendes

Cavalca

2017

Struct Control Health Monit

View full text Add to dashboard Cite

show abstract

“…An integrated mechatronic model is presented for the chatter analysis of a machine tool equipped with MR damper. Reference [6] controlled active magnetic bearings using adaptive back stepping control (ABC) and adaptive observer based back stepping controller (AOBC) and made both control systems stable using Lyapunov method. Reference [7] analyzed magnetic suspension systems with large flexible rotordynamics.…”

Section: Introductionmentioning

confidence: 99%

Active vibration control of rotor-bearing system by virtual dynamic absorber

Monjezi

Heidari

2019

Eur. Phys. J. Appl. Phys.

View full text Add to dashboard Cite

The main sources of the vibration in rotor dynamic systems are unbalanced masses and manufacturing defects of bearings used in the rotor system. In this study, magnetic absorber as a new method brings the rotor system out of resonance state by applying a dynamic absorber system force and creating two new natural frequencies. This study virtually reconstructed magnetic absorber controller software as a combined active and passive dynamic absorber to reduce vibration amplitude, efficiently. In this approach, combined routes are defined for the rotor frequency response, so that the optimal values of the parameters of dynamic absorber system are calculated using H ∞ method and maximum damping for frequencies lower and higher than resonance frequencies, respectively. The results confirm that transient response overshoot is less, and transient response attenuation is more in maximum damping method. Hence, the controller system easily recognizes initial overshoots and determines the parameters of the dynamic absorber system in accordance with maximum damping state if it is struck at any rotor frequency and any rotation angle. It is also observed that for all rotor rotation frequencies, the system overshoot reduces in comparison with H ∞ method by using this control method. *

show abstract

“…In addition, the non-contact between the rotor and the bearing and the absence of lubrication make these new bearings ideally suitable for use in a variety of vacuum applications and sterile clean rooms. These advantages have been the subject of research work in a wide range of studies of magnetic bearings [1][2][3][4]. The above studies have shown the need for the use of linear controllers, in order to control the behaviour of the magnetic bearings [5].…”

Section: Introductionmentioning

confidence: 99%