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This paper designed a hinged type beam clamping structure based on the characteristics of the Langevin-type transducer oscillator having obvious vibration node. The corresponding motor stator was developed based on the previous U-shape type linear ultrasonic motor. A simple mechanical model of the structure was established to analyze the effects of spring stiffness on the normal pressure and tangential...
This work proposes a new linear motor for an electric bus propulsion system. The vehicle is powered by a new topology of permanent magnet synchronous linear motor. The slider of the motor is integrally attached to the floor of the vehicle to propel. The motor is fed with an alternating voltage conveniently applied to a three-phased stator coils which are distributed in the rails that attach the vehicle...
This paper analyses a kind of leaf spring ultrasonic motor (USM). A radial vibration of the stator is excited by PZT and then the radial displacement is converted to a rotation of the rotor by the bending of leaf springs. The dynamics model of the motor is firstly studied by theoretical method and then the amplitude-frequency characteristic of the stator is calculated by the Finite Element Method...
The research development regarding Axial Flux Permanent Magnet Generator (AFPMG) has been more interesting, since its construction is simple, easy (iron coreless), and portable. Permanent magnet NdFeB type has high density, commercially available everywhere, relatively low price, and long usage duration. It is brushless resulting in cheap maintenance; and direct drive resulting in high efficiency...
In this paper, current command to reduce noise and vibration of switched reluctance motors have been investigated. Noise and vibration were reported to be significantly reduced by making a radial force sum as flat as possible with current profiling. In order to realize flat radial force sum, dc, fundamental, and second harmonic components were required. The dc and fundamental components are determined...
This paper presents a research on design, modeling, simulation and implementation based control of a novel ROTLIN (Rotary-Linear) Radial Gap Helical Machine. The machine is comprised of Stator, Mid-Layer Rotor and the Inner Layer Translator. Structurally, it is made using smartly piecewise helical-shaped Permanent Magnet (PM) which are radially magnetized and helically layered on both Rotor and Translator...
This paper presents a novel Synchronous Reluctance Tubular Linear Motor (SyncRTLM) for high precision motion control applications, such as machine tools. Finite Element Analysis (FEA) of the motor is conducted to simulate the motor performance and to analyse the magnetic fields in the motor. The design and development of the built motor is outlined, where a novel construction technique is described...
The design and engineering of electrical drive trains is a multi disciplinary task. Usually several teams of different technical fields are involved in the development of new drive trains. Each team focuses on their own field of expertise. Even though the interactions of the described teams are well defined, acoustic irregularities are determined not before prototype stage frequently. This leads to...
Linear oscillating motor provides short-stroke reciprocate motion with high efficiency and long lifespan, receiving much attention, especially in aerospace applications. LEHA is a novel flight actuation system, in which linear oscillating motor plays an important role. Thus, high output performance of LEHA relies on detailed researches into dynamics of linear motor. In this study, dynamics model is...
Conventional linear machine consists of only one stator and one mover. In this paper, a permanent magnet (PM) tubular linear motor with multiple movers is proposed to improve the efficiency of stator field. The outer and inner movers can produce independent motions by interacting with the PM stator. It can be used in large systems requiring multiple driven elements and space saving. The employment...
Linear oscillating motor attracts much attention in short-stroke reciprocate motion applications, due to direct and efficient linear movement output. However, the requirement of high output power in linear motor always leads to rapid increase of outer diameter, which is not only bulky in structure but also decreases power density. In order to achieve efficient high power linear motor design, E-Type...
This paper presents the design of Permanent Magnet Synchronous Actuator. The Permanent Magnet Synchronous Actuator is designed for piloting SBW direction. The output of the designed actuator is then coupled with a rotary-to-linear motion transformation organ and applied as a force to the wheel axis to obtain imposed direction and speed. The torque obtained from the finite element simulation under...
The paper aims in analysing the performance of a single axis-controlled repulsive type magnetic bearing system. The model of the system is designed using an industry level modelling software Ansys Maxwell. The model designed is a horizontal axis one and the philosophy behind the design principle is that of a passive magnetic bearing system. The model indicates two rotor bodies whose axis of rotation...
The linear switched reluctance machine (LSRM) has the merits of low cost, simple structure and mechanical robustness [1]. It is one of the most promising candidates in the direct-drive applications such as linear transportation and position control systems [2-3]. However, they are limited to some special use due to their inherently low propulsion force output and high force ripples, especially in...
Magnetic bearings can support a floater (rotor) without mechanical contacts in rotating machinery systems. Since the rotors can be supported by magnetic bearings without mechanical contacts, some merits are expected. For example, (1) there are no friction and wear, (2) the system can be operated at higher rotational speeds than bearing systems with mechanical contacts, (3) vibration and noise can...
Radial forces due to rotor eccentricity (or unbalanced magnetic pull) are a common source of noise and vibration in a permanent-magnet synchronous motor [1]. Previous works on radial forces due to eccentricity use an approach of harmonic superposition [2] or the assumption of linear variation in magnetic fields according to eccentricity [3]. In this paper, we use a perturbation theory to find a closed-form...
This paper describes the design, construction, and operation of a closed-loop spherical induction motor (SIM) ball wheel for a balancing mobile robot (ballbot). Following earlier work, this new design has a smaller rotor and higher torques due to the use of six stators in a skewed layout. Actuation and sensing kinematics as well as control methods are presented. In its current implementation, torques...
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...
Magnetic bearings (MBs) can be classified as active magnetic bearing (MB), hybrid MB and passive MB. Recently, MBs have been applied in high speed motor, magnetic suspension flywheel, artificial heart blood pump and so on. MBs have obtained extensive research interest [1-3]. Axial hybrid magnetic bearing (AHMB) has the advantages of small size, low power consumption, no friction, no abrasions, free...
Ropeless elevators have developed very quickly in recent years. There are two main drawbacks of the conventional elevators with rope, especially when they are used in skyscrapers of 250–400m high [1]. One problem is that the space occupancy of the total floor space would be more than 30% in buildings over 250m high [2]. Another drawback is that controlling the elevator in tall buildings is difficult...
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