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Sizing by optimization usually implies a model definition able to link the desired objective and constrained functions with the design parameters. When gradient based optimization algorithms are used, highly accurate derivatives are required. Without special software solutions, this procedure easily becomes time-consuming or error-prone. In this paper, our goal is to first observe the modeling needs...
To enhance the performance of a Thomson-coil actuator, generalized topology modification method is developed, and applied to the shape optimization of the conducting plate. In the method, shape optimization problem is treated as that of optimal assigning of material to each segment among available materials.
The induction planar actuator (IPA) in study is an electromagnetic structure formed by a static ferromagnetic core with an aluminium plate that corresponds to the secondary, and a mover, also called primary; the latter comprehends two sets of three-phase windings that are orthogonal to each other. When they are fed by a three-phase ac excitation, a moving magnetic field is established; it can travel...
Topology optimization methods suffer from a lack of convexity for the design of electromagnetic actuators. Local minimizers prevent the method from attaining the optimal solution. The optimization result may then vary according to the initial conditions. This paper proposes a convexity-oriented method focusing on the maximization of the forces exerted on ferromagnetic parts. In addition to canceling...
This paper describes the trajectory analysis method for a spherical resonant actuator using the three-dimensional finite element method (3-D FEM). The effects of frequency and phase of the applied voltage on the trajectory of the armature are clarified using this method.
This paper describes the dynamic analysis of a three-degree-of-freedom electromagnetic spherical actuator employing 3-D FEM. In this analysis, the magnetic field equation is combined with the electric circuit equation and motion equations of three axes. The influence of one axis operation on other axes is evaluated. The validity of the analysis is confirmed by carrying out the measurement on a prototype.
The purpose of this paper is to analyze and design an electromagnetic linear actuator of active linear absorber (ALA) system for vehicle vibration reduction. An ALA system is one of the effective methods to reduce vibration generated by engine. It generates the counter force to cancel abnormal vibration generated when the variable cylinder is working. So, to reduce the engine vibration efficiently,...
This paper presents the new design of flat-coil actuator. Novel shorted turn and copper center pole are placed into existing design in order to reduce the inductance of coil and improve the initial response. Dynamic finite element analysis using commercial electromagnetic solver “MAXWELL” is performed to simulate the improvement of dynamic characteristics, especially fast initial response.
One of the most promising ways to improve fuel economy, reduce CO2 emissions and increase torque output is to achieve variable valve timing (VVT). Some of the devices developed in the past years include mechanical, hydraulic, motor-driven and electromagnetic actuators. Existing most advanced system is an electromagnetic actuator using solenoids to activate engine valves. It, however, needs the current...
The purpose of this paper is to analyze and design an electromagnetic linear actuator for linear pump. Solenoid linear actuator is widely used because it occupies small space: it has no mechanical energy conversion system. In addition, the energy loss is very low and it makes no noise. Conventional solenoid linear actuator, however, has the critical drawback of high power consumption. In this research,...
In this paper, a novel permanent magnet (PM) actuator for low voltage controlled vacuum contactor is proposed. Magnetic field is analyzed using finite element method. The simulation being carried out couples the electrical circuit equation, mechanical equation and magnetic field. A prototype is manufactured and tested, which shows that the contactor equipped with the proposed PM actuator has good...
Parametric analysis of Thomson-coil actuator has been done by utilizing the adaptive equivalent circuit method. Through the analysis of circuit parameters and plate dimensions, an optimal design of the actuator is obtained.
This paper aims at the development of a topology optimization method for magnetic actuator design using a level-set model that incorporates a fictitious interface energy model based on concepts in the phase-field method. The optimization problem is formulated for maximizing performance of a magnetic actuator with the ferromagnetic material constraint. The update scheme for implicit moving boundaries...
In this paper we propose a numerical modeling of magnetic properties of ferromagnetic shape memory alloys (FSMAs). In order to utilize the engineering modeling in numerical simulations for designing new magnetic actuators, relationship among stress, temperature and magnetic properties of FSMAs was measured and modeled with an arc-tangent function. The modeling was applied to analyze a simple example...
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