The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A 3D analytical model is developed for the computation of the no-load magnetic field distribution in flux reversal linear-rotary permanent magnet actuator (FR-LRPMA) with two PM poles (PM_pole) and two ferromagnetic poles (Fe_pole) on each stator tooth. Then a 3D model for calculating the air-gap permeance is presented considering the effect of stator slot and the permeance difference of Fe_pole and...
The linear rotary permanent magnet actuator (LRPMA) is a type of multidegree of freedom actuators, which can be widely applied in many fields such as aircraft driving, drilling process. This paper analyzes a novel LRPMA with interlaced poles mounted on the surface of its mover, namely, permanent magnet poles (PM_pole) and ferromagnetic poles (Fe_pole). The electromagnetic primary parameters are calculated...
There is a growing demand for the actuators that could fulfill the discontinuous operation requirement of holding at a certain position for a desired period of time. This can be found application in power assistive devices and switching adapters. Recently, the use of appropriate cogging torque to affix the actuator at a fixed position without electric energy became an attractive solution of concern...
The linear-rotary permanent magnet actuator (LRPMA) has been widely used in industrial manufacturing, automation control field and so on. The mover of developed LRPMA needs a lot of NdFeB material with the Halbach structure. In order to decrease the amout of NdFeB, a novel LRPMA is proposed using interlaced poles, namely, permanent magnet (PM) poles and iron poles, as shown in Fig.1 (a), (b). The...
Conventionally, many single-degree-of-freedom actuators were used to realize devices with multi degrees of freedom. However, this makes the structure larger, heavier and more complicated due to the large number of actuators. To remove these drawbacks, the development of a spherical actuator with multi degrees of freedom is necessary, and various spherical actuators have been developed [1], including...
Recently, the drive mechanism is complex configurations as the electronic component mounting apparatus and the machine tool are high performance. The head portion of those is the drive mechanism with two-degree-of-freedom of rotary and linear motion. Conventional two-degree-of-freedom drive is composed of 2 motors and mechanical elements[1]. However, it is huge, heavy and in need of maintenance by...
This paper presents a model-free iterative learning control algorithm, which generates time-optimal point-to-point motions for linear time-invariant systems. The proposed optimization-based algorithm consists of two levels. At the first level, a bisection algorithm determines the fastest possible point-to-point motion, i.e. the motion time is minimized, subject to actuator limitations. At the second...
In this paper, a permanent magnet actuator with two degrees of freedom is analyzed. The actuator can provide rotation and translation independently controlled. Additionally, passive gravity overcompensation is included in the actuator, i.e., during power down conditions, the translator will be at rest in its upper position. The different aspects of this actuator are described and a prototype is designed...
This paper presents a novel model-free iterative learning control algorithm for linear time-invariant systems with actuator constraints. At every trial, a finite impulse response filter to update the system input is computed by solving a convex optimization problem that minimizes the next trial's tracking error while accounting for actuator constraints. The presented iterative learning control algorithm...
This paper presents the design concepts and the test results of an electro-mechanical actuator for high-performance pump application. The rotating permanent magnet synchronous motor is integrated with the mechanical component in a rotating-screw architecture in order to minimize the total inertia. The motion trajectory fits the classical profile with high-torque at low-speed and low-torque at high...
This paper is to present the design, development and prototyping of an electrically actuated thruster as a direct drive propulsion system based on a 3-phase permanent magnet brushless machine for an autonomous underwater vehicle. The non-linear design and analysis of the permanent magnet brushless motor are entirely performed in 2-d finite element method. The motor is then coupled directly to a 6-inch...
This paper presents a moving-magnet type linear actuator designed by using flux concentration type permanent magnet arrangement, which can generate higher magnetic flux density in air-gap. In this construction, detent force which is induced by both slot-effect and end-effect becomes larger due to strong attractive forces. To reduce cogging force we have employed a modular mover structure of two magnetic...
This paper presents the modeling and the experimental verification of a tubular actuator for a pick and place application. To increase the throughput of a placement robot for printed circuit boards, very fast linear motion is required. A moving magnet tubular actuator with axially magnetized magnets is selected. Using a semi-analytical magnetic field description coupled to thermal models, a design...
In the context of more electric aircrafts, the use of electric actuators instead of hydraulic ones is one of the main topics of research and development in electrical engineering. A high level of reliability, the redundancy and the compactness are required for aircraft electrical actuators. For achieving these purposes the classical solution consists in using two identical actuators motorized each...
Several forging manipulators are presented. Such machine is aimed to use in robotic forging operations. According to forging processes, forging manipulators with full degrees of freedom are necessary. First, the basic concepts of the special Plucker coordinates (GF set) are presented. Then, the structure synthesis of forging manipulator is described step by step.
Single-phase permanent magnet (PM) linear oscillating actuators having alternative topologies are designed and analyzed by finite element analysis, with particular reference to a novel tubular E-core interior permanent magnet (IPM) oscillating actuator. Their electromagnetic performance is compared and relative merits are evaluated. It shows that the E-core actuators exhibit much less end flux leakage...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.