Novel moving coil tubular actuator with double sided PM array

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A football kicking high speed actuator for a mobile robotic application

This paper presents the design and validation of a high speed reluctance actuator for a soccer robot. The actuator is used to shoot a regular sized soccer ball by applying different force levels directly to the ball. As the application requires force in only one direction, a plunger type reluctance actuator is selected. A capacitor is used to buffer energy from the battery of the robot. Through an IGBT, the energy is transferred from the capacitor to the actuator. Consequently, by applying pulse width modulation, the force applied by the actuator can be adjusted to enable a variable shooting power. The reluctance type actuator is designed using finite element analysis. The actuator is build and implemented in the robot providing the capability to shoot a ball from standstill over 12 meters with a starting speed of 11 m/s

Novel moving coil tubular actuator with double sided PM array

No abstrac

Analytical model of the interaction force between a rectangular coil and a cuboidal permanent magnet

Diges

Electrostatic modeling of cavities inside linear actuators

Abstract. This paper describes the modeling of two-dimensional electric fields inside linear actuators where cavities in the cooling environment are present. A semi-analytical model based on Fourier series is extended for cavities and incorporates the curvature of corners. The model shows good agreement with finite element analysis. The effect of position and sizes of the cavity are investigated as well as the curvature of the corners of the cavity

Power from the people - Human-powered small-scale generation system for a sustainable dance club

Most Human-Powered Energy-Harvesting Systems are used to power ubiquitously deployed sensor networks and mobile electronics. These systems scavenge power from human activity or derive limited energy from ambient heat, light, or vibrations. In this article, systems that use human power by walking or running are analyzed, where an alternative system has been designed and implemented that generates energy from people dancing in a club environment

Slotless PM machines with skewed winding shapes:3D electromagnetic modeling

The 3D modeling technique presented in this paper, predicts, with high accuracy, electromagnetic fields and corresponding dynamic effects in conducting regions for rotating machines with slotless windings, e.g. self-supporting windings. The presented modeling approach can be applied to a wide variety of slotless winding configurations, including skewing and/or different winding shapes. It is capable to account for induced eddy-currents in the conductive rotor parts, e.g. permanent magnet eddy-current losses, albeit not iron and winding AC losses. The specific focus of this paper is to provide the reader with the complete implementation and assumptions details of such a 3D semi-analytical approach, which allows model validations with relatively short calculation times. This model can be used to improve future design optimizations for machines with 3D slotless windings. It has been applied, in this paper, to calculate fixed parameter Faulhaber, Rhombic, and Diamond slotless PM machines to illustrate accuracy and applicability

Influence of multiple air gaps on the performance of electrical machines with (semi) Halbach magnetization

The ever increasing necessity to improve torque density while simultaneously maintaining high efficiency is a constant point of concern for electrical machine designers. This is mainly driven by the need for direct-drive solutions in evermore applications. This paper presents a general mesh-free description of the magnetic field distribution in multiple air-gap electromagnetic machines, although the tool is also useful for single air-gap machines, actuators, and other magnetic devices. The used method is based on transfer relations and Fourier theory, which can provide the magnetic field solution for a wide class of 2-D boundary value problems. This technique is in this paper applied to the rotary multiple air-gap machine with slotless (without slots but with and without rotor back-iron) armature. The presented analysis is compared to finite-element analysis for the multiple-layer winding, which shows the applicability of this method for future optimization. It is shown that multiple air-gap machines make better use of the volume and for short axial lengths where a single-side bearing configuration can be utilized provides a means to improve the achievable torque density

Moving device as well as a component placement device provided with such a moving device

Samenvatting van US 2011194923 (A1) A moving device comprises at least a first element provided with main magnets and a second element provided with coils. The main magnets are arranged in a grid of rows and columns, wherein main magnets in adjacent rows are oppositely polarised and staggered relative to each other. The coils can be energized for moving the first element relative to the second element in a direction parallel to the rows as well as in a direction parallel to the columns. Auxiliary magnets of the same polarity are disposed between the main magnets at least in a number of rows, wherein the strength of the magnetic field of said auxiliary magnets is different from that of the main magnets