Permanent-Magnets Linear Actuators Applicability in Automobile Active Suspensions

Abstract

Significant improvements in automobile suspension performance are achieved by active systems. However, current active suspension systems are too expensive and complex. Developments occurred in power electronics, permanent magnet materials and microelectronic systems justifies analysis of the possibility of implementing electromagnetic actuators in order to improve the performance of automobile suspension systems without excessively increasing complexity and cost. In this paper, the layouts of hydraulic and electromagnetic active suspensions are compared. The actuator requirements are calculated, and some experimental results proving that electromagnetic suspension could become a reality in the future are shown.

Control of Nonlinear Active Vehicle Suspension Systems Using Disturbance Observers

“…For an electromagnetic active suspension system, the damper is replaced by an electromagnetic actuator (Martins et al, 2006). In this configuration, it is assumed that…”

“…Some active control schemes are based on neural networks, genetic algorithms, fuzzy logic, sliding modes, H-infinity, adaptive control, disturbance observers, LQR, backstepping control techniques, etc. See, e.g., (Cao et al, 2008); (Isermann & Munchhof, 2011); (Martins et al, 2006); (Tahboub, 2005); (Chen & Huang, 2005) and references therein. In addition, some interesting semiactive vibration control schemes, based on Electro-Rheological (ER) and Magneto-Rheological (MR) dampers, have been proposed and implemented on commercial vehicles.…”

Efficiency of a regenerative direct-drive electromagnetic active suspension

“…One phase leg of the circuit diagram is shown in Fig. 4, and the associated equations for the copper losses , mechanical power , and supply power are given by (4) (5) (6) (7) with being the simulation length, which is set to 30 s. Inherently, the TPMA will have eddy current losses, which will result in damping forces ; however, these forces are not considered "losses," because they contribute to the value of the passive damping . Because the suspension system can work in four quadrant operations, the passive damping can be decreased (motor mode) and increased (generator mode) by applying active forces (see Fig.…”

The Energy Regeneration of Electromagnetic Energy Saving Active Suspension in Full Vehicle with Neurofuzzy Controller

“…In recent years, researchers worldwide have made attempts on the vehicle vibration control and energy regeneration, including theoretical and experimental progresses [6][7][8][9]. Developments achieved in power electronics, permanent magnet materials, and microelectronic systems enable the possibility of actual implementation of electromagnetic actuators in order to improve the performance of vehicle suspension systems [10]. In Reference [11], the authors investigated the idea of the energy regeneration of active suspension systems in petrol-electric hybrid vehicles.…”