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Tubular linear motor has many favorable features, like quick response, strong output, suitable for narrow installation space, et al, so it is widely used for the linear electromechanical servo systems. But, the tubular linear motor design constraints by a plurality of structural parameters, so there are some problems, for example output force cannot meet the needs and large power fluctuation. In order...
Cogging force is one of the main factors causing the thrust fluctuation of permanent magnet synchronous linear motor, in order to effectively suppress the influence of cogging force on the thrust fluctuations, cogging force is analytical analyzed based on energy method and Fourier decomposition method, this paper proposes unequal pole-pitch method of stator and mover to inhibit the cogging force of...
This paper is concerned with the analysis of a linear permanent magnet brushless DC launcher composed of an armature and a permanent magnet stator. An efficient analysis method using time-stepping finite-element method (FEM) is employed in order to analyze the dynamic characteristics of this kind of motor, and a prototype machine is fabricated on the basis of the results. Measured value shows a good...
This paper presents the optimization of a small tubular linear motor in order to obtain the best relationship of power, efficiency and volume. A genetic algorithm method with a mathematical model consisting in a Finite Element program and analytical expressions is employed. The obtained results are compared to experimental ones.
Recently, the application of multi-dimension drive systems is increasing. Generally, this drive system consists of plural motors. However, since plural motors are used for this structure, the equipment becomes large and control becomes complicated. At this laboratory, extensive research and development of a surface motor (SFM) were carried out. The structure of SFM proposed until now has arranged...
This paper presents the design procedure and modeling methodology for a four sided floating type of linear permanent magnet generator used in sea wave energy extraction applications. The hydraulic system of wave generation with buoy has been developed. Appropriate coupled magnetic-electric-mechanical models for the analysis of the linear permanent magnet (LPM) generator is researched with finite element...
Development, analysis and control of an axial flux permanent magnet linear oscillating motor (PMLOM) along with a suitable speed and thrust control technique is described in this paper. Also its performance parameters, such as the force, current, efficiency, power factor etc. are experimentally assessed. The objective of this paper is to determine the forces for aluminium mover embedded with the rare...
This paper presents a new method for dynamical control of the linear motor which consists of Halbach permanent array. This motor is designed for micro-motion or micro-location precision instruments. Based on a novel mathematic model of the linear motor, which takes the lateral and normal force into account, an improved field-oriented control method is applied. This method enables the operation of...
Permanent-magnet Linear oscillating motor can perform a precision oscillation task without exceeding a given limit on allowable average power dissipation. In this paper analysis of an axial flux permanent magnet linear oscillating motor (PMLOM) along with a suitable speed and thrust control technique is described. Microcontroller based IGBT Inverter is developed to control the PMLOM. Also its performance...
This paper deals with the development of a tubular permanent magnet linear drive with radial magnetized armature and discrete wound coils mounted on a star-shaped stator part. The rated force of the developed machine is 500 N per segment. This presented particular design results in a very economic product because all primary parts, except of the permanent magnets and coils, are made of standard non-laminated...
This paper presents an optimum direct thrust force control for interior permanent magnet linear synchronous motor (PMLSM) over wide velocity range in which the maximum thrust force per ampere (MTPA) strategy is used below the base velocity and field weakening strategy is used above the base velocity. Using MTPA strategy, copper losses is minimized in constant force region, and using field weakening...
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...
This paper proposes a new stator section crossing method that can overcome the drawbacks of the tow-step and three-step methods used in Shanghai Maglev railway. This method has no descending of propelling force and idleness of PWM converters. The mathematic model and vector control strategy of the permanent magnetic long stator linear machine (PMLSM) are also researched in this paper. The effectiveness...
The significant drawback of the permanent magnet linear synchronous motor (PMLSM) is force ripples, which are generated by the distortion of the stator flux linkage distributions, cogging forces caused by the interaction of the permanent magnet and the iron core and the end effects. This will deteriorate the performance of the drive system in high precision applications. The PMLSM and its parasitic...
A linear pulse motor developed by the authors was selected as the actuator for a total artificial heart, because it had the highest thrust/volume ratio, at 0.76 N/ml, of the eight kinds of linear motor considered. This paper summarizes the results of an acute animal experiment using a linear pulse motor-driven total artificial heart (linear TAH). The linear TAH consisted of a linear pulse motor, two...
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