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In recent years, permanent magnet (PM) machines have received increasing attention for direct-drive applications due to its high efficiency and improved power density performances [1]. In [2], a linear stator permanent magnet vernier (LSPMV) machine is proposed, in which the stator consists of an iron core wound with distributed windings and PMs mounted on the surface of the stator teeth, while the...
The characteristic of radial electromagnetic force and torque ripple of permanent magnet assisted synchronous reluctance motor (PMSynRM) under load condition was analyzed; considering to minimize the radial electromagnetic force and torque ripple, An effective and detailed method of suppressing vibration of PMSynRM was proposed. The validity of the proposed method is confirmed by both simulated and...
In power systems, electrical motors are essential elements which account for the majority of the electrical load. Although the basic design and control theory has been studied for multitudes of years, there are still some common problems which are necessary to further study.
Through directly driving by a novel moving-magnet transverse-flux linear oscillatory motor (LOM), an integrated linear oscillatory compressor is presented in this paper. The compressor has the characteristics of simple manufacture process, good dynamic performance, small size and high efficiency. The basic structure of the integrated linear oscillatory compressor proposed is presented in Fig.1. The...
We previously proposed a linear permanent magnet vernier machine (LPMVM) which has the permanent magnets on the primary side with armature winding and the secondary side without armature winding [1]. In that machine, even only the permanent magnets on the primary side generate a thrust force. That idea has brought a novel topology of linear PM machines which doesn't need any magnets on the secondary...
In the high speed industrial application, bearingless motor, which integrates advantages of magnetic bearing into motor, has received more and more attention.[1-2] In this paper, stiffness analysis for one novel bearingless SRM with bias permanent magnet is investigated. Fig.1 shows the basic structure and prototype motor. It's a radial suspending structure equipped with permanent magnet to provide...
Improving accuracy is one of the most important research topics in many advanced industrial applications, such as microscopy, biomedical science and semiconductor lithography. On the one hand, to improve the accuracy requires improvement on the system precision, on the other hand, it requires improvement on the system vibration isolation capability. At present, active vibration isolation system composed...
In recent years, low speed and high torque direct drive motor is increasingly used in many application for industrial drive for the improved performance, especially for replacing the motor with structure of reducer which possess some shortcomings, such as complex structure, big volume and low efficiency of transmission. In this paper, we designed a 32poles/30slots fractional slot direct drove motor...
Ocean wave energy is a renewable energy source with a large potential that may contribute to increasing demand for power. Traditional conversion system uses hydraulic or air turbine to drive rotary electrical machines. The low efficiency and high cost in the transmission system become significant issues. Using direct-drive structure, linear permanent magnet(PM) machine eliminates intermediate transmission...
Valve actuator is a critical component of the electromagnetic valve in the pneumatic steering gear. By controlling the action and release of the actuator, the gas circuit can be switched, thus to control the attitude adjustment of the missile. The traditional actuator is solenoid structure. In order to satisfy the demand of saving energy, lowering the driving power of the coil and providing enough...
In general, the conventional permanent magnet (PM) linear machine can reduce the energy conversion steps by eliminating the rotary to linear conversion mechanism which in turn reduces the maintenance cost in the wave energy extraction, while it suffers from bulky size due to a large number of poles for low speed operation. Therefore, the permanent magnet linear vernier machine has been regarded as...
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...
In this paper we design a three-phase tubular permanent magnet linear motor for high speed lifting application. Analytical formulas are derived to predict the magnetic field distribution, magnetic flux linkage, induced electromotive force, total force and current. The major design parameters are optimized by the analytical solution to meet the performance requirement of the linear machine. The final...
When a magnetostrictive actuator (MA) is designed, it is general to use a bias magnetic field for various purposes. One of them is to design a bidirectional MA. It is also expected that the performance of the MA can be fully utilized. The way to impose the bias magnetic field can be classified into the use of a solenoid or a permanent magnet (PM). The PM is preferred to the solenoid due to volume...
A 12 slots/11 poles double-side permanent magnet linear synchronous motor (D-PMLSM) is developed for grinding machine. The armature ends are shifted to lower the end force, which can improve the stability of the thrust force to avoid operation error. By FEM, its parameters are optimized, and performances are predicted at no load and full load, which are partly validated by the measurement of prototype...
Flux-switching linear permanent magnet (FSLPM) machines with magnets and armature windings in primary mover are suitable for long stator applications such as railway and vertical transportation systems [1], thus have attracted more and more attention. Different topologies have been proposed to improve the torque /thrust density The sandwiched flux-switching machine with equal volume of permanent magnet...
This paper introduces an optimal design for a cross-coupled two-degree-of-freedom (2-DOF) motor. Generally, Halbach magnet array can realize high magnetic loading. Therefore, higher thrust force and torque will be obtained by employing Halbach magnet array. The proposed motor has a shaft, the permanent magnets, helical windings, and two bobbins. This structure can independently realize linear and...
In a number of electromagnetic actuators, the stator and translator are structured to create highly nonlinear fringing flux to generate force that varies linearly with displacement. Reliable prediction of such force requires an accurate model for the fringing flux. Assuming that saturation is neglected and the fringings are elliptical, a reluctance model for fringing flux is derived that depends on...
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 base concept of this project is to create a sustained energy from renewable source, due to the decrease of conventional energy resources and it is necessary to find an alternate source. The Magnetic material (neodymium) is eco-friendly resources, used for the construction of permanent magnet. These permanent magnets have high energy density within them; this plays a vital role for this engine...
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