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Due to simple and robust configuration, and without any coils and magnets on movers, a tubular linear switched reluctance actuator (TLSRA) is a promising candidate for applications of frequently reciprocating linear motion, such as linear compressors and automotive active suspension sys-tems[1-2]. For air-gap in a TLSRA, there are the longitudinal and transverse magnetic paths due to various mover...
Two linear electrostatic microactuators were designed in order to optimize the force characteristics of a linear motion type electrostatic microactuator for high thrust performance. Finite element method (FEM) analyses are used to analyze and optimize the microactuator's designed parameters. The two structures are designed to be linear-actuated and are compared under similar conditions. The objective...
The purpose of this work is to describe a possibility of installation of a wave converter in Sicily, in the Mediterranean Sea. In this paper we present the design of buoyant electrical generator, in particular, wave linear permanent magnet generator which can make wave energy converted to electrical energy.
This paper considers the hierarchical control strategy for enhancing the captured and converted powers in heaving wave energy converters. The hierarchical control strategy consists of a higher hierarchical controller (HHC) and a lower hierarchical controller (LHC). The main role of the HHC is to provide the optimum reference for the LHC. The LHC follows the reference despite the existence of perturbations...
This paper presents a novel double-sided linear synchronous generator intended for applications in Wave Energy Conversion. The proposed open slot structure of the proposed generator simplifies the manufacturing process. The external and internal stators are in a relative position to each other that improves magnetic flux utilization and reduces oscillations in reluctance for different translator positions...
No production process of electrical machines is ideal. During the process, various stochastic manufacturing deviations can occur. Common tolerances are for example static or dynamic rotor eccentricities, asymmetric stator teeth if segmented sheets are used or — for electrical machines with permanent magnets (PMs) — a variable magnetic behavior caused by material or due to the magnetization process...
In this work an integrated model for acoustic evaluation of electric vehicles is introduced. The paper focuses on the force excitation part of the model. The analysis is performed for permanent magnet synchronous machines. The excitation forces are placed on the stator teeth and calculated for a structure dynamic model of the power train. A model for the acoustic emission is adapted and finally the...
Linear flux-switching permanent magnet (LFSPM) motor attracts widely attention due to its high power density and high efficiency, in which both concentrated windings and PMs are on the short primary mover. Hence, it is very suitable for long stator applications such as urban rail transportations. However, a large numbers of existing LFSPM motors are obtained from simply splitting and unrolling the...
This paper presents an analysis of the air gap radial Maxwell forces in some three-phase, inner rotor Concentrated Winding surface Permanent Magnet Synchronous Machine (CW-PMSM). Two modular winding machines and one asymmetric, winding machine are considered and simulated by a Finite Element method (FE). The air gap Maxwell pressure results from multiplication of the flux density harmonics due to...
The paper is aimed at a dual sizing-based approach to minimize the cogging force of a tubular linear synchronous machine (T-LSM) with quasi-Halbach magnetized PMs in the mover. The study is initiated by the prediction of the spatial repartition of the no-load air gap flux density. Then, a formulation of the cogging force, based on the predicted spatial repartition of the no-load air gap flux density,...
To ensure reliable drive with an induction machine requires deep insight in electro-mechanical dynamics during its operation. The flexible multibody modeling technique enables the simulation of dynamic loads on all drive components. This paper focuses on complex modeling of machine's behavior in case of eccentrically placed rotor. The life time of machine's bearing becomes very important issue of...
One of the most commonly used energy harvesting fitness equipment is the propelled bicycle, where conventional rotary generators are used along with mechanical equipments as peripherals to produce power. There is much other fitness equipment which gives linear oscillatory motion can be directly utilized to produce power with the help of permanent magnet linear generator. The permanent magnet linear...
The paper describes magnetically levitated planar actuator with moving magnets. The translator part is represented by a disc permanent magnet or a uniform shaped object fulfilling specific requirements, so that it can provide sufficient control force against the lateral forces and the gravity force of the carrier. The stator platform is represented by 16 identical coils and a microcontroller board...
This paper describes the development of mathematical model with a pump and a relief proportional valve used to control the pressure of a hydraulic system. This system controls an accelerated pavement testing machine designed to simulate the fatigue of a road structure. The pressure control system was composed by an Anti-Windup PID.
This paper proposes a new cross-coupled two-degree-of-freedom (2DOF) direct drive motor which can independently realize rotary and linear motions. In this proposed motor, the mover part is a shaft with segment magnets formed in checkers. On the other hand, two sets of helical windings are cross-coupled in the stator part. The configuration can generate thrust force and torque independently. In this...
In this paper, a modular method of modeling compliant robotic systems using graph theory is treated. Graph theoretic analyses ensure a structured way of describing a system and allow a straightforward extension to more complex systems. The graph models of a series elastic actuator, a variable stiffness actuator and a multi degrees of freedom compliant system are derived. These systems are controlled...
Many mechanical faults in industrial processes are related to bearing damage, which can be detected by vibration analysis. This approach may be expensive due to the cost of sensors. Therefore, studies are performed in order to use the stator current to detect bearing damage. This study is to investigate the impact of the load in the bearing damage detection by using the stator current. A diagnostic...
Since the expansion of renewables in Germany, a fast start-up of turbine generators increases in importance to compensate load peaks and reactive power. Therefore, the machines need an excitation field at standstill. Conventional brushless excitation systems consist of two different synchronous machines, which are not able to provide currents to the rotating part of the generator without rotational...
The finite reluctance approach is very well suited for fast modeling and dynamic simulation of permanent magnet synchronous machines with inverter feeding. This paper shows validating simulations, in both steady-state and transient conditions, carried out for a permanent magnet linear motor designed for on board ship load actuation. The basics of the method are resumed. The simulations obtained by...
The aim of this paper is to develop and verify a new concept of bearingless machine for large direct-drive wind turbines. The new bearingless machine is constructed with double-sided air-gaps and flux concentrating transverse flux permanent magnet (TFPM) linear machine configuration. Unlike the windings of conventional bearingless machines, the main windings of the new bearingless machine are used...
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